/* ============================================================
   Project G-Code Tutorial — Stylesheet
   Design language: precision tool steel meets modern ed-tech.
   Primary: #1A6B5C (coolant teal)  Accent: #F5A623 (chip gold)
   Surface: #0F1923 (machine dark)  Text: #E8EDF2 (aluminum white)
   ============================================================ */

/* ─── RESET & TOKENS ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-bg:        #0F1923;
  --c-surface:   #172130;
  --c-surface2:  #1E2D3D;
  --c-border:    #2A3D52;
  --c-primary:   #1A6B5C;
  --c-primary-l: #22876E;
  --c-accent:    #F5A623;
  --c-accent-l:  #FFB94A;
  --c-correct:   #28A745;
  --c-wrong:     #DC3545;
  --c-error:     #DC3545;
  --c-text:      #E8EDF2;
  --c-text-2:    #9BAFC4;
  --c-text-3:    #5F7A92;
  --c-code-bg:   #101820;
  --c-code-text: #7FDBCA;

  --r-sm:  6px;
  --r-md:  12px;
  --r-lg:  18px;
  --r-xl:  24px;

  --shadow-card: 0 2px 12px rgba(0,0,0,0.4);
  --shadow-float: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.25);

  --f-display: 'JetBrains Mono', 'Courier New', monospace;
  --f-body:    'Inter', 'Segoe UI', system-ui, sans-serif;
  --f-code:    'JetBrains Mono', 'Fira Code', monospace;

  --nav-h: 58px;
  --bottom-nav-h: 78px;
}

body.theme-light {
  --c-bg:        #F4F7FA;
  --c-surface:   #FFFFFF;
  --c-surface2:  #E9EEF3;
  --c-border:    #B8C6D2;
  --c-primary:   #176B5D;
  --c-primary-l: #218873;
  --c-accent:    #9A5A00;
  --c-accent-l:  #B96E00;
  --c-correct:   #28A745;
  --c-wrong:     #DC3545;
  --c-error:     #B30000;
  --c-text:      #101820;
  --c-text-2:    #2F4050;
  --c-text-3:    #4F6375;
  --c-code-bg:   #EEF3F6;
  --c-code-text: #0D6658;
  --shadow-card: 0 2px 12px rgba(24,42,56,0.12);
  --shadow-float: 0 8px 32px rgba(24,42,56,0.18);
  --shadow-sm: 0 1px 4px rgba(24,42,56,0.16);
  --bottom-nav-h: 88px;
}

html { font-size: 16px; scroll-behavior: smooth; }
html, body { height: 100%; }

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--f-body);
  line-height: 1.6;
  min-height: 100dvh;
  overflow: hidden;
}

.loading-splash {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 15% 15%, rgba(240, 160, 64, 0.14), transparent 18rem),
    radial-gradient(circle at 80% 20%, rgba(32, 201, 151, 0.18), transparent 22rem),
    linear-gradient(160deg, #07131D 0%, #0F2630 48%, #071018 100%);
  padding: 1.15rem;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.loading-splash.done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.loading-monitor {
  width: min(94vw, 620px);
  transform: perspective(900px) rotateX(2deg);
}
.loading-monitor__bezel {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, #D6DEE3, #758894 12%, #152230 13%, #0B151F 100%);
  border: 1px solid rgba(236, 245, 247, 0.26);
  border-radius: 24px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.38), inset 0 1px 0 rgba(255,255,255,0.28);
  padding: clamp(0.8rem, 3vw, 1.15rem);
}
.loading-monitor__bezel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(255,255,255,0.12), transparent 35%, rgba(255,255,255,0.04) 62%, transparent 63%);
  pointer-events: none;
}
.loading-monitor__header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.2rem 0.25rem 0.85rem;
}
.loading-monitor__eyebrow {
  color: var(--c-accent);
  font-family: var(--f-display);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}
.loading-monitor__brand {
  color: #F3FBFA;
  font-family: var(--f-display);
  font-size: clamp(1.35rem, 5vw, 2rem);
  font-weight: 900;
  line-height: 1.05;
}
.loading-monitor__badge {
  border: 1px solid rgba(240, 160, 64, 0.55);
  border-radius: 999px;
  color: #F6B24D;
  font-family: var(--f-display);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  padding: 0.4rem 0.65rem;
  white-space: nowrap;
}
.loading-monitor__display {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(7.5rem, 0.7fr);
  gap: clamp(0.75rem, 3vw, 1rem);
  min-height: clamp(270px, 42vh, 360px);
  overflow: hidden;
  border: 1px solid rgba(96, 139, 145, 0.55);
  border-radius: 16px;
  background:
    linear-gradient(rgba(32, 201, 151, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(32, 201, 151, 0.045) 1px, transparent 1px),
    radial-gradient(circle at 25% 30%, rgba(32, 201, 151, 0.22), transparent 18rem),
    #06161A;
  background-size: 24px 24px, 24px 24px, auto, auto;
  padding: clamp(1rem, 4vw, 1.35rem);
}
.loading-monitor__display::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(255,255,255,0.055), transparent);
  animation: terminalScan 3.6s linear infinite;
  pointer-events: none;
}
.loading-monitor__code {
  align-self: center;
}
.loading-monitor__code pre {
  position: relative;
  z-index: 1;
  margin: 0;
  min-height: 150px;
  background: rgba(3, 16, 18, 0.52);
  border: 0;
  border-left: 4px solid var(--c-accent);
  border-radius: 0 12px 12px 0;
  color: #9CF0DB;
  font-size: clamp(0.82rem, 3.2vw, 1.02rem);
  padding: 0.75rem 0 0.75rem 0.95rem;
}
.loading-monitor__panel {
  position: relative;
  z-index: 1;
  align-self: stretch;
  display: grid;
  align-content: center;
  gap: 0.45rem;
  border-left: 1px solid rgba(156, 240, 219, 0.22);
  color: #DDECE9;
  font-family: var(--f-display);
  padding-left: clamp(0.75rem, 3vw, 1rem);
}
.loading-monitor__panel span {
  color: rgba(221, 236, 233, 0.54);
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}
.loading-monitor__panel strong {
  color: #F6B24D;
  font-size: clamp(0.82rem, 2.6vw, 1rem);
  line-height: 1.1;
}
.loading-monitor__bootbar {
  position: relative;
  z-index: 1;
  height: 0.55rem;
  overflow: hidden;
  background: rgba(221, 236, 233, 0.14);
  border-radius: 999px;
  margin-top: 0.85rem;
}
.loading-monitor__bootbar span {
  display: block;
  width: 72%;
  height: 100%;
  background: linear-gradient(90deg, var(--c-accent), #F6B24D);
  border-radius: inherit;
  animation: bootBar 4.3s ease-out forwards;
}
.loading-monitor__stand {
  width: min(34vw, 170px);
  height: 1.1rem;
  background: linear-gradient(180deg, rgba(118, 136, 148, 0.55), rgba(18, 31, 42, 0.15));
  border-radius: 0 0 18px 18px;
  margin: 0 auto;
}
@media (max-width: 520px) {
  .loading-monitor__display { grid-template-columns: 1fr; }
  .loading-monitor__panel {
    grid-template-columns: repeat(3, 1fr);
    border-left: 0;
    border-top: 1px solid rgba(156, 240, 219, 0.22);
    padding: 0.8rem 0 0;
  }
  .loading-monitor__panel span, .loading-monitor__panel strong { text-align: center; }
}
.type-line {
  --type-duration: 1.15s;
  --type-delay: 0s;
  display: block;
  width: 0;
  max-width: max-content;
  overflow: hidden;
  white-space: nowrap;
  position: relative;
  animation: typeLine var(--type-duration) steps(34, end) forwards;
  animation-delay: var(--type-delay);
}
.type-line::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1.15em;
  margin-left: 2px;
  background: transparent;
  vertical-align: -0.16em;
  animation: caretActive var(--type-duration) step-end both;
  animation-delay: var(--type-delay);
}
.type-line.l2 { --type-delay: 1.05s; }
.type-line.l3 { --type-delay: 2.1s; }
.type-line.l4 {
  --type-delay: 3.15s;
}
.type-line.l4::after {
  animation: caretActive var(--type-duration) step-end both, caretBlink 0.7s step-end infinite;
  animation-delay: var(--type-delay), calc(var(--type-delay) + var(--type-duration));
}
@keyframes typeLine {
  to { width: 100%; }
}
@keyframes caretActive {
  0%, 99% { background: var(--c-accent); }
  100% { background: transparent; }
}
@keyframes caretBlink {
  0%, 100% { background: var(--c-accent); }
  50% { background: transparent; }
}

@keyframes bootBar {
  from { width: 10%; }
  to { width: 100%; }
}
@keyframes terminalScan {
  from { transform: translateY(-100%); }
  to { transform: translateY(100%); }
}
/* ─── TYPOGRAPHY ─────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); }
h2 { font-size: clamp(1.2rem, 3vw, 1.6rem); }
h3 { font-size: clamp(1.15rem, 4vw, 1.45rem); }
h4 { font-size: 0.95rem; color: var(--c-accent); text-transform: uppercase; letter-spacing: 0.06em; }

p { margin-bottom: 0.75rem; color: var(--c-text-2); }
p:last-child { margin-bottom: 0; }

a { color: var(--c-primary-l); text-decoration: none; }
a:hover { color: var(--c-accent); }

pre, code {
  font-family: var(--f-code);
  font-size: 0.875rem;
  background: var(--c-code-bg);
  color: var(--c-code-text);
}
pre {
  padding: 1rem 1.25rem;
  border-radius: var(--r-md);
  border-left: 3px solid var(--c-primary);
  overflow-x: auto;
  margin: 0.75rem 0;
  line-height: 1.7;
}
code {
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
pre code {
  padding: 0;
  background: none;
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--c-text-2);
}
li { margin-bottom: 0.35rem; }

strong { color: var(--c-text); font-weight: 600; }

/* ─── CALLOUTS ───────────────────────────────────────────── */
.callout {
  padding: 0.75rem 1rem;
  border-radius: var(--r-sm);
  margin: 0.75rem 0;
  font-size: 0.9rem;
}
.callout.warning {
  background: rgba(220, 53, 69, 0.12);
  border-left: 3px solid var(--c-wrong);
  color: #F8A5AE;
}
body.theme-light .callout.warning {
  color: #6F101A;
}
.callout.tip {
  background: rgba(245, 166, 35, 0.10);
  border-left: 3px solid var(--c-accent);
  color: #FCC875;
}
/* ─── LAYOUT ─────────────────────────────────────────────── */
.app-wrapper {
  width: 100%;
  margin: 0 auto;
  height: 100dvh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  background: var(--c-bg);
}

.screen {
  display: none;
  flex-direction: column;
  height: calc(100dvh - var(--nav-h) - var(--bottom-nav-h));
  min-height: 0;
  padding-bottom: 0;
  overflow: hidden;
}
.screen.active { display: flex; }

/* ─── TOP BAR ─────────────────────────────────────────────── */
.top-bar {
  flex: 0 0 var(--nav-h);
  z-index: 100;
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  padding: 0 1rem;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.top-bar__logo {
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.top-bar__logo span.bracket { color: var(--c-primary-l); }
.top-bar__streak {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--c-accent);
}
.top-bar__xp {
  font-size: 0.8rem;
  color: var(--c-text-2);
  font-weight: 600;
}
body.theme-light .top-bar__logo { color: #8A5200; }

/* ─── BOTTOM NAV ──────────────────────────────────────────── */
.bottom-nav {
  flex: 0 0 var(--bottom-nav-h);
  width: 100%;
  height: var(--bottom-nav-h);
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  display: flex;
  z-index: 200;
}
.nav-btn {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--c-text-3);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--f-body);
  line-height: 1.1;
  transition: color 0.15s;
  padding-bottom: env(safe-area-inset-bottom, 0);
}
.nav-btn .icon { font-size: 1.75rem; }
.nav-btn.active { color: var(--c-accent); }
.nav-btn:hover { color: var(--c-text-2); }
body.theme-light .bottom-nav .nav-btn { color: #566A7B !important; }
body.theme-light .bottom-nav .nav-btn.active { color: #8A5200 !important; }

/* ─── HOME SCREEN ─────────────────────────────────────────── */
.home-scroll { overflow-y: auto; flex: 1; min-height: 0; }

.hero-block {
  background: linear-gradient(135deg, var(--c-surface) 0%, #0D1E2B 100%);
  padding: 2rem 1.5rem 1.5rem;
  border-bottom: 1px solid var(--c-border);
}
body.theme-light .hero-block {
  background: linear-gradient(135deg, #FFFFFF 0%, #E6EDF3 100%);
  border-bottom-color: #B5C2CE;
  box-shadow: inset 0 -1px 0 rgba(24,42,56,0.06);
}
.hero-greeting {
  font-size: 0.85rem;
  color: var(--c-text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}
.hero-title {
  font-family: var(--f-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 1rem;
}
.hero-title span { color: var(--c-accent); }

.track-switcher {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  background: rgba(16,24,32,0.85);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 4px;
  margin-bottom: 1rem;
}
body.theme-light .track-switcher {
  background: #DDE6EE;
  border-color: #9BADBC;
}
.track-btn {
  min-height: 38px;
  border: 0;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--c-text-2);
  font-family: var(--f-body);
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, box-shadow 0.15s;
}
body.theme-light .track-btn { color: #415364; }
.track-btn:hover { color: var(--c-text); }
.track-btn.active {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 1px 8px rgba(0,0,0,0.25);
}
body.theme-light .track-btn.active {
  color: #FFFFFF;
  background: #176B5D;
  text-shadow: 0 1px 1px rgba(0,0,0,0.18);
}

.xp-bar-wrap {
  background: var(--c-border);
  border-radius: 999px;
  height: 8px;
  overflow: hidden;
  margin-bottom: 0.4rem;
}
.xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  border-radius: 999px;
  transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
}
.xp-bar-label {
  font-size: 0.78rem;
  color: var(--c-text-3);
  display: flex;
  justify-content: space-between;
}
.daily-pill {
  margin-top: 0.85rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid rgba(245,166,35,0.35);
  border-radius: var(--r-md);
  background: rgba(245,166,35,0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}
.daily-pill span {
  color: var(--c-accent);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.daily-pill strong {
  color: var(--c-text);
  font-size: 0.85rem;
  text-align: right;
}
.daily-pill.is-done {
  border-color: rgba(47,191,113,0.55);
  background: rgba(47,191,113,0.1);
}
body.theme-light .xp-bar-label,
body.theme-light .unit-card__progress,
body.theme-light .prog-lessons-done,
body.theme-light .settings-help {
  color: #3E5264;
}

.motivation-panel {
  padding: 1rem 1rem 0;
}
.motivation-row {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 0.75rem;
}
.motivation-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 0.85rem;
  min-width: 0;
}
.daily-mission-card {
  display: block;
  width: 100%;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.daily-mission-card:disabled {
  cursor: default;
  opacity: 0.65;
}
.daily-mission-card:not(:disabled):active {
  transform: translateY(1px);
}
body.theme-light .motivation-card {
  background: #FFFFFF;
  border-color: #B5C2CE;
  box-shadow: 0 1px 4px rgba(24,42,56,0.08);
}
.motivation-card.complete {
  border-color: rgba(47,191,113,0.7);
}
.motivation-kicker {
  font-size: 0.66rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-accent);
  margin-bottom: 0.2rem;
}
.motivation-title {
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.25;
  overflow-wrap: anywhere;
}
.motivation-sub {
  margin-top: 0.25rem;
  color: var(--c-text-3);
  font-size: 0.76rem;
  line-height: 1.35;
}
body.theme-light .motivation-sub { color: #3E5264; }
.weak-review-card,
.track-review-card {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid rgba(245,166,35,0.55);
  border-radius: var(--r-md);
  background:
    linear-gradient(90deg, rgba(245,166,35,0.2), rgba(26,107,92,0.12)),
    var(--c-surface);
  color: var(--c-text);
  text-align: left;
  cursor: pointer;
  box-shadow: 0 10px 22px rgba(0,0,0,0.16);
}
.weak-review-card:active,
.track-review-card:active { transform: translateY(1px); }
.weak-review-card__mark {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  background: var(--c-accent);
  color: #1B1404;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 1.15rem;
}
.weak-review-card strong,
.weak-review-card em,
.track-review-card strong,
.track-review-card em {
  display: block;
}
.weak-review-card strong,
.track-review-card strong {
  font-family: var(--f-display);
  font-size: 0.95rem;
  line-height: 1.2;
}
.weak-review-card em,
.track-review-card em {
  margin-top: 0.2rem;
  color: var(--c-text-3);
  font-size: 0.76rem;
  line-height: 1.35;
  font-style: normal;
}
body.theme-light .track-review-card,
body.theme-light .weak-review-card {
  background: linear-gradient(90deg, #FFF2D7, #EAF7F3);
  color: #142536;
  border-color: #D8A845;
  box-shadow: 0 8px 20px rgba(35,52,68,0.1);
}
body.theme-light .weak-review-card em,
body.theme-light .track-review-card em { color: #3E5264; }
.badge-strip {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.75rem 0 0.1rem;
}
.badge-chip {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 30px;
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  color: var(--c-text-3);
  background: rgba(255,255,255,0.03);
  font-size: 0.72rem;
  font-weight: 800;
}
.badge-chip span {
  font-family: var(--f-display);
  font-size: 0.68rem;
}
.badge-chip.unlocked {
  color: #FFFFFF;
  border-color: rgba(47,191,113,0.7);
  background: rgba(47,191,113,0.24);
}
body.theme-light .badge-chip {
  color: #566A7B;
  background: #FFFFFF;
  border-color: #B5C2CE;
}
body.theme-light .badge-chip.unlocked {
  color: #155D32;
  background: #DDF5E6;
  border-color: #65B982;
}

.section-label {
  padding: 1.25rem 1.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-3);
}

/* ─── UNIT CARDS ──────────────────────────────────────────── */
.unit-card {
  margin: 0 1rem 1rem;
  background:
    radial-gradient(circle at 88% 8%, rgba(245,166,35,0.12), transparent 30%),
    linear-gradient(180deg, var(--c-surface) 0%, rgba(18,31,43,0.96) 100%);
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border);
  overflow: hidden;
  position: relative;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  cursor: pointer;
  box-shadow: var(--shadow-card);
}
.unit-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.42;
  background:
    linear-gradient(115deg, transparent 0 55%, rgba(255,255,255,0.035) 55% 56%, transparent 56%),
    repeating-linear-gradient(90deg, transparent 0 28px, rgba(127,219,202,0.05) 28px 29px);
}
.unit-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.28;
}
.unit-card > * {
  position: relative;
  z-index: 1;
}
.unit-card.track-cnc.unit-1::after {
  background:
    linear-gradient(90deg, transparent 58%, rgba(127,219,202,0.16) 58% 60%, transparent 60%),
    repeating-linear-gradient(0deg, transparent 0 22px, rgba(245,166,35,0.16) 22px 23px);
}
.unit-card.track-cnc.unit-2::after {
  background:
    radial-gradient(ellipse at 88% 70%, transparent 0 34%, rgba(127,219,202,0.18) 35% 36%, transparent 37%),
    linear-gradient(135deg, transparent 0 58%, rgba(245,166,35,0.2) 58% 60%, transparent 60%);
}
.unit-card.track-cnc.unit-3::after {
  background:
    repeating-radial-gradient(circle at 86% 34%, transparent 0 13px, rgba(127,219,202,0.13) 14px 15px),
    linear-gradient(90deg, transparent 0 66%, rgba(245,166,35,0.16) 66% 68%, transparent 68%);
}
.unit-card.track-cnc.unit-4::after {
  background:
    radial-gradient(circle at 84% 28%, transparent 0 15px, rgba(245,166,35,0.22) 16px 17px, transparent 18px),
    radial-gradient(circle at 84% 28%, transparent 0 31px, rgba(127,219,202,0.16) 32px 33px, transparent 34px),
    linear-gradient(0deg, transparent 0 66%, rgba(255,255,255,0.08) 66% 67%, transparent 67%);
}
.unit-card.track-cnc.unit-5::after {
  background:
    linear-gradient(90deg, transparent 0 56%, rgba(47,191,113,0.14) 56% 58%, transparent 58%),
    repeating-linear-gradient(0deg, transparent 0 16px, rgba(245,166,35,0.12) 16px 17px),
    radial-gradient(circle at 84% 34%, rgba(127,219,202,0.16), transparent 22%);
}
.unit-card.track-printing.unit-1::after {
  background:
    repeating-linear-gradient(0deg, transparent 0 18px, rgba(127,219,202,0.12) 18px 19px),
    repeating-linear-gradient(90deg, transparent 0 18px, rgba(245,166,35,0.12) 18px 19px),
    radial-gradient(circle at 86% 32%, rgba(127,219,202,0.18), transparent 24%);
}
.unit-card.track-printing.unit-2::after {
  background:
    radial-gradient(circle at 86% 32%, rgba(245,166,35,0.18), transparent 18%),
    linear-gradient(90deg, transparent 0 62%, rgba(127,219,202,0.18) 62% 64%, transparent 64%),
    repeating-linear-gradient(0deg, transparent 0 20px, rgba(255,255,255,0.06) 20px 21px);
}
.unit-card.track-printing.unit-3::after {
  background:
    linear-gradient(135deg, transparent 0 52%, rgba(245,166,35,0.18) 52% 54%, transparent 54%),
    repeating-linear-gradient(90deg, transparent 0 24px, rgba(127,219,202,0.1) 24px 25px),
    radial-gradient(circle at 84% 64%, rgba(127,219,202,0.15), transparent 20%);
}
body.theme-light .unit-card,
body.theme-light .ref-card,
body.theme-light .prog-unit-card,
body.theme-light .settings-group,
body.theme-light .streak-card,
body.theme-light .prog-hero {
  border-color: #B5C2CE;
  box-shadow: 0 1px 4px rgba(24,42,56,0.08);
}
body.theme-light .unit-card {
  background:
    radial-gradient(circle at 88% 8%, rgba(185,110,0,0.11), transparent 30%),
    linear-gradient(180deg, #FFFFFF 0%, #F5F8FA 100%);
  border-color: #A9B9C7;
  box-shadow: 0 8px 22px rgba(35,52,68,0.09), inset 0 1px 0 rgba(255,255,255,0.95);
}
body.theme-light .unit-card::before {
  opacity: 0.55;
  background:
    linear-gradient(115deg, transparent 0 55%, rgba(23,107,93,0.06) 55% 56%, transparent 56%),
    repeating-linear-gradient(90deg, transparent 0 28px, rgba(23,107,93,0.045) 28px 29px);
}
body.theme-light .unit-card::after { opacity: 0.36; }
.unit-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-float); }
.unit-card:active { transform: translateY(0); }

.unit-card__header {
  padding: 1rem 1.25rem 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--c-border);
  background: rgba(255,255,255,0.02);
}
.unit-card__icon {
  font-size: 1.5rem;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, rgba(245,166,35,0.22), rgba(26,107,92,0.18));
  border: 2px solid rgba(245,166,35,0.28);
  flex-shrink: 0;
}
.unit-card__meta { flex: 1; }
.unit-card__name {
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-text);
}
.unit-card__progress {
  font-size: 0.78rem;
  color: var(--c-text-3);
  margin-top: 2px;
}
.unit-card__badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: rgba(245,166,35,0.15);
  color: var(--c-accent);
}
.unit-card__badge.locked {
  background: rgba(255,255,255,0.06);
  color: var(--c-text-3);
}

.unit-card__lessons {
  position: relative;
  padding: 0.9rem 0.95rem 0.95rem;
}
.unit-card__lessons::before {
  content: "";
  position: absolute;
  top: 1.2rem;
  bottom: 1.45rem;
  left: 2.2rem;
  width: 5px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--c-primary), rgba(245,166,35,0.75), var(--c-border));
  opacity: 0.55;
}
.lesson-row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 58px;
  margin: 0 0 0.55rem;
  padding: 0.6rem 0.75rem 0.6rem 0.35rem;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: background 0.12s, transform 0.12s, border-color 0.12s;
}
.lesson-row:hover {
  background: rgba(255,255,255,0.045);
  border-color: rgba(255,255,255,0.08);
  transform: translateX(2px);
}
.lesson-row.locked { opacity: 0.4; cursor: default; pointer-events: none; }
body.theme-light .lesson-row.locked { opacity: 0.62; }
body.theme-light .lesson-row.locked .lesson-row__title,
body.theme-light .lesson-row.locked .lesson-row__xp {
  color: #7A8792;
}
.review-row {
  margin-top: 0.75rem;
  padding: 0.75rem 0.85rem 0.75rem 0.35rem;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: linear-gradient(90deg, rgba(245,166,35,0.12), rgba(26,107,92,0.08));
}
.review-row:not(.locked) {
  border-color: rgba(245,166,35,0.5);
}
body.theme-light .review-row {
  background: #FFF7E8;
  border-color: #D9B66A;
}
.review-row .lesson-row__title {
  font-family: var(--f-display);
  font-weight: 700;
}

.lesson-dot {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
  border: 3px solid var(--c-border);
  color: var(--c-text-3);
  font-family: var(--f-display);
  font-weight: 700;
  background: var(--c-surface);
  box-shadow: 0 0 0 5px var(--c-surface);
  z-index: 1;
}
.lesson-dot.done {
  background: linear-gradient(180deg, var(--c-primary-l), var(--c-primary));
  border-color: #7FDBCA;
  color: #fff;
}
.lesson-dot.active {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: rgba(245,166,35,0.14);
  box-shadow: 0 0 0 5px var(--c-surface), 0 0 0 9px rgba(245,166,35,0.12);
}

.lesson-row__title {
  font-size: 0.9rem;
  color: var(--c-text);
  flex: 1;
}
.lesson-row__xp {
  font-size: 0.78rem;
  color: var(--c-accent);
  font-weight: 600;
  background: rgba(245,166,35,0.1);
  border-radius: 999px;
  padding: 0.12rem 0.45rem;
  white-space: nowrap;
}
body.theme-light .lesson-row__xp,
body.theme-light .prog-pct,
body.theme-light .unit-card__badge {
  color: #7A4700;
}
body.theme-light .unit-card__header {
  background: rgba(238,243,247,0.7);
}
body.theme-light .unit-card__icon {
  background: linear-gradient(180deg, #FFF0C9, #DDF5E6);
  border-color: #D9B66A;
}
body.theme-light .unit-card__lessons::before {
  background: linear-gradient(180deg, #176B5D, #B96E00, #C7D3DE);
  opacity: 0.75;
}
body.theme-light .lesson-row:hover {
  background: rgba(23,107,93,0.06);
  border-color: #C8D5DF;
}
body.theme-light .lesson-dot {
  background: #FFFFFF;
  box-shadow: 0 0 0 5px #FFFFFF;
}
body.theme-light .lesson-dot.active {
  background: #FFF7E8;
  box-shadow: 0 0 0 5px #FFFFFF, 0 0 0 9px rgba(185,110,0,0.12);
}
body.theme-light .lesson-row__xp {
  background: #FFF1D5;
}

.wrong-path-preview {
  margin-top: 0.9rem;
  padding: 0.85rem 1rem;
  background: rgba(220, 53, 69, 0.1);
  border: 1px solid rgba(220, 53, 69, 0.3);
  border-radius: var(--r-md);
}
.wrong-path-preview__label {
  font-size: 0.78rem;
  font-weight: 800;
  color: #ff8a95;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}
.wrong-path-preview__codes {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
}
.wrong-path-preview__expected,
.wrong-path-preview__chosen {
  flex: 1;
  background: rgba(0,0,0,0.15);
  border-radius: var(--r-sm);
  padding: 0.4rem 0.55rem;
}
.wrong-path-preview__code {
  font-family: var(--f-code);
  font-weight: 700;
  color: var(--c-accent);
}
.wrong-path-preview__hint {
  font-size: 0.78rem;
  font-family: var(--f-body);
  color: var(--c-text-2);
  margin-top: 0.2rem;
}
.wrong-path-preview__vs {
  color: var(--c-text-3);
  font-size: 1rem;
}
.wrong-path-preview__note {
  font-size: 0.88rem;
  color: var(--c-text-2);
  line-height: 1.4;
}

/* ─── REFERENCE PREVIEW ──────────────────────────────────── */
.ref-card__preview {
  display: none;
  padding: 0.55rem 1rem 0.65rem;
  border-top: 1px dashed var(--c-border);
  color: var(--c-text-2);
  font-size: 0.82rem;
  line-height: 1.45;
}
.ref-card.open .ref-card__preview,
.ref-card:focus-within .ref-card__preview {
  display: block;
}
body.theme-light .ref-card__preview {
  background: #F6FAFC;
}

.ref-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  background: rgba(40,167,69,0.18);
  color: #4ade80;
}
body.theme-light .ref-badge {
  background: #D8F5E2;
  color: #0D6B45;
}
.ref-badge--learned {
  background: rgba(30, 168, 118, 0.18);
  color: #6ee7b7;
}
body.theme-light .ref-badge--learned {
  background: #D4F5EA;
  color: #0B6B4B;
}
.ref-card--learned {
  border-color: rgba(40, 167, 69, 0.45);
}

.ref-card__actions {
  margin-top: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.ref-action--learned {
  font-size: 0.9rem;
  font-family: var(--f-code);
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--c-border);
  background: rgba(255,255,255,0.04);
  color: var(--c-text);
}
.ref-action--learned[aria-pressed=true] {
  border-color: rgba(40,167,69,0.5);
  background: rgba(30,168,118,0.1);
  color: #4ade80;
}
body.theme-light .ref-action--learned[aria-pressed=true] {
  background: #D4F5EA;
  color: #0B5F40;
  border-color: #39C88A;
}

.unit-card__why {
  margin-top: 0.3rem;
  font-size: 0.82rem;
  color: var(--c-text-2);
  line-height: 1.4;
}

.lesson-row__why {
  margin-top: 0.3rem;
  padding-top: 0.35rem;
  border-top: 1px dashed var(--c-border);
  font-size: 0.8rem;
  color: var(--c-text-2);
  line-height: 1.35;
}

/* ─── MILESTONE REWARD ───────────────────────────────────── */
.milestone-strip {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.5rem 1rem 0.6rem;
}
.milestone-chip {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 42px;
  padding: 0.45rem 0.75rem;
  border-radius: var(--r-md);
  border: 1px solid rgba(245,166,35,0.55);
  background: linear-gradient(90deg, rgba(245,166,35,0.18), rgba(26,107,92,0.12));
  box-shadow: var(--shadow-sm);
}
.milestone-chip__mark {
  font-size: 1rem;
  color: var(--c-accent);
}
.milestone-chip__title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--c-text);
}
.milestone-chip__sub {
  font-size: 0.72rem;
  color: var(--c-text-2);
}

/* ─── LESSON SCREEN ───────────────────────────────────────── */
.lesson-header {
  flex: 0 0 auto;
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.back-btn {
  background: none;
  border: none;
  color: var(--c-text-2);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
}
.back-btn:hover { color: var(--c-accent); }

.lesson-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--c-border);
  border-radius: 999px;
  overflow: hidden;
}
.lesson-progress-fill {
  height: 100%;
  background: var(--c-accent);
  border-radius: 999px;
  transition: width 0.4s ease;
}
.lesson-step-count {
  font-size: 0.8rem;
  color: var(--c-text-3);
  white-space: nowrap;
}

.lesson-content {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 1.25rem;
}

.step-card {
  display: none;
  position: relative;
  animation: fadeSlide 0.3s ease;
}
.step-card.active { display: block; }
.step-card.has-audio {
  padding-right: 3.25rem;
}
.btn-audio {
  position: absolute;
  top: 0;
  right: 0;
  width: 2.45rem;
  height: 2.45rem;
  border: 1px solid var(--c-border);
  border-radius: 50%;
  background: var(--c-surface2);
  color: var(--c-text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.15rem, 4vw, 1.45rem);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.btn-audio:hover,
.btn-audio:focus-visible {
  border-color: var(--c-accent);
  color: var(--c-accent);
  outline: none;
}
.btn-audio.speaking {
  border-color: var(--c-error);
  background: rgba(255, 107, 107, 0.14);
  color: var(--c-error);
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

.step-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  margin-bottom: 0.5rem;
}
.step-title {
  font-family: var(--f-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 1rem;
}

/* Theory content styles */
.why-card {
  background: rgba(245, 166, 35, 0.10);
  border: 1px solid rgba(245, 166, 35, 0.35);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--r-md);
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
}
.why-label {
  font-family: var(--f-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-accent-l);
  margin-bottom: 0.35rem;
}
.why-text {
  color: var(--c-text);
  font-size: 0.95rem;
  line-height: 1.5;
}
.weak-relearn-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}
.weak-relearn-card {
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--r-md);
  padding: 0.85rem;
}
.weak-relearn-card__label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--c-accent);
}
.weak-relearn-card__title {
  margin-top: 0.25rem;
  font-family: var(--f-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--c-text);
}
.weak-relearn-card p {
  margin: 0.35rem 0 0;
  color: var(--c-text-2);
  line-height: 1.45;
}
body.theme-light .weak-relearn-card {
  background: #F7FAFC;
}
.fact-check-card {
  margin-top: 1rem;
  padding: 0.8rem;
  border: 1px solid rgba(45, 212, 191, 0.35);
  border-radius: var(--r-md);
  background: rgba(45, 212, 191, 0.08);
  color: var(--c-text);
}
.fact-check-card summary {
  cursor: pointer;
  font-family: var(--f-display);
  font-weight: 800;
  color: var(--c-teal-l);
}
.fact-check-card p {
  margin: 0.65rem 0;
  color: var(--c-text-2);
  line-height: 1.45;
}
.fact-check-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.fact-check-links a {
  padding: 0.35rem 0.55rem;
  border-radius: 999px;
  background: var(--c-surface2);
  color: var(--c-teal-l);
  font-size: 0.78rem;
  font-weight: 700;
  text-decoration: none;
}
body.theme-light .fact-check-card {
  background: #E8F7F3;
  color: #183B35;
}
body.theme-light .fact-check-card summary,
body.theme-light .fact-check-links a {
  color: #0B5D50;
}
.fact-check-card--compact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 0.7rem;
  font-size: 0.76rem;
}
.fact-check-label {
  color: var(--c-teal-l);
  font-family: var(--f-display);
  font-weight: 800;
}
.fact-check-date { color: var(--c-text-2); }
body.theme-light .fact-check-label { color: #0B5D50; }
.question-visual .visual-aid {
  margin: 0.75rem 0 1rem;
  padding: 0.65rem;
}

.theory-body p { margin-bottom: 0.85rem; }
.theory-body ul, .theory-body ol { margin-bottom: 0.85rem; }

/* ─── QUIZ ELEMENTS ───────────────────────────────────────── */
.quiz-question {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 1.25rem;
  line-height: 1.5;
  white-space: pre-line;
}
.question-context-card {
  background: rgba(245, 166, 35, 0.09);
  border: 1px solid rgba(245, 166, 35, 0.26);
  border-radius: var(--r-md);
  padding: 0.8rem;
  margin-bottom: 0.95rem;
}
.question-context-card__label {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.35rem;
}
.question-context-card__why {
  color: var(--c-text-2);
  line-height: 1.45;
  font-size: 0.9rem;
}
.pool-notice {
  background: rgba(245, 166, 35, 0.12);
  border: 1px solid rgba(245, 166, 35, 0.3);
  border-radius: var(--r-md);
  color: var(--c-text-2);
  font-size: 0.88rem;
  line-height: 1.4;
  margin-bottom: 0.95rem;
  padding: 0.65rem 0.75rem;
}
body.theme-light .question-context-card {
  background: rgba(245, 166, 35, 0.12);
}

.options-list { display: flex; flex-direction: column; gap: 0.65rem; }

.option-btn {
  background: var(--c-surface2);
  border: 2px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 0.9rem 1.1rem;
  text-align: left;
  cursor: pointer;
  color: var(--c-text);
  font-size: 0.92rem;
  font-family: var(--f-body);
  line-height: 1.4;
  transition: border-color 0.15s, background 0.15s;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.option-btn:hover:not(:disabled) {
  border-color: var(--c-primary-l);
  background: rgba(26,107,92,0.12);
}
.option-btn.correct {
  border-color: var(--c-correct);
  background: rgba(40,167,69,0.12);
  color: #7DE89A;
}
.option-btn.wrong {
  border-color: var(--c-wrong);
  background: rgba(220,53,69,0.12);
  color: #F0A0A8;
}
.option-btn:disabled { cursor: default; }

.option-letter {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  font-family: var(--f-display);
}
.option-btn.correct .option-letter { background: var(--c-correct); color: #fff; }
.option-btn.wrong .option-letter { background: var(--c-wrong); color: #fff; }

/* True / false */
.true-false-question {
  font-size: 1.15rem;
  text-align: center;
}
.true-false-actions {
  display: grid;
  min-height: 5.5rem;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.25rem;
}
.tf-btn {
  min-height: 5.5rem;
  background: var(--c-surface2);
  border: 2px solid var(--c-border);
  border-radius: var(--r-lg);
  color: var(--c-primary-l);
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.tf-btn:hover:not(:disabled) {
  border-color: var(--c-primary-l);
  background: rgba(26,107,92,0.12);
}
.tf-btn:active:not(:disabled) { transform: scale(0.98); }
.tf-btn.correct {
  border-color: var(--c-correct);
  background: rgba(40,167,69,0.14);
  color: #7DE89A;
}
.tf-btn.wrong {
  border-color: var(--c-wrong);
  background: rgba(220,53,69,0.12);
  color: #F0A0A8;
}
.tf-btn:disabled { cursor: default; }

/* Matching */
.matching-game-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}
.matching-game-title {
  font-family: var(--f-display);
  font-size: clamp(1.35rem, 5.8vw, 1.85rem);
  line-height: 1.1;
  color: var(--c-text);
}
.matching-game-count {
  min-width: 3.2rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  background: var(--c-surface2);
  color: var(--c-accent);
  font-family: var(--f-display);
  font-size: 0.78rem;
  text-align: center;
}
.matching-game-subtitle {
  color: var(--c-text-2);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 1.4rem;
}
.matching-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}
.matching-column {
  display: grid;
  gap: 0.9rem;
}
.matching-card {
  min-height: 5.35rem;
  width: 100%;
  background: rgba(28, 43, 56, 0.84);
  border: 3px solid rgba(120, 144, 164, 0.34);
  border-radius: 18px;
  color: #E8EDF2;
  cursor: pointer;
  font-family: var(--f-display);
  font-size: clamp(0.9rem, 3.5vw, 1.05rem);
  font-weight: 800;
  line-height: 1.25;
  padding: 0.85rem 0.65rem;
  text-align: center;
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease, box-shadow 0.12s ease;
  box-shadow: inset 0 -2px 0 rgba(0,0,0,0.24);
}
.matching-card:active:not(:disabled) {
  transform: scale(0.98);
}
.matching-card.selected {
  background: rgba(48, 152, 194, 0.18);
  border-color: #41BCE8;
  box-shadow: 0 0 0 3px rgba(65,188,232,0.15), inset 0 -2px 0 rgba(0,0,0,0.18);
}
.matching-card.matched {
  background: rgba(40,167,69,0.11);
  border-color: rgba(120, 144, 164, 0.22);
  color: rgba(232,237,242,0.45);
  transform: scale(0.98);
}
.matching-card.wrong {
  background: rgba(220,53,69,0.16);
  border-color: #FF9AA2;
  color: #FF7E88;
  box-shadow: 0 0 0 3px rgba(255,154,162,0.14);
}
.matching-card:disabled {
  cursor: default;
  opacity: 1;
}
.matching-help {
  color: var(--c-muted);
  font-family: var(--f-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-top: 1.1rem;
  text-align: center;
  text-transform: uppercase;
}
#lesson-action-btn:disabled {
  background: #435464;
  color: rgba(15,25,35,0.65);
  cursor: default;
  transform: none;
}
body.theme-light .matching-game-title {
  color: #172838;
}
body.theme-light .matching-game-count {
  background: #FFFFFF;
  border-color: #D5DFE7;
  color: #8A5200;
}
body.theme-light .matching-card {
  background: #FFFFFF;
  border-color: #B8C8D3;
  color: #172838;
  box-shadow: inset 0 -2px 0 rgba(24,42,56,0.12);
}
body.theme-light .matching-card.selected {
  background: #E6F7FF;
  border-color: #1EA7D8;
  color: #172838;
  box-shadow: 0 0 0 3px rgba(30,167,216,0.16), inset 0 -2px 0 rgba(24,42,56,0.08);
}
body.theme-light .matching-card.matched {
  background: #DDF5E6;
  border-color: #65B982;
  color: #22543A;
}
body.theme-light .matching-card.wrong {
  background: #FFE6EA;
  border-color: #D8465F;
  color: #9E2437;
}
body.theme-light #lesson-action-btn:disabled {
  background: #C8D5DF;
  color: #6B7F90;
}
@media (max-width: 360px) {
  .matching-card-grid { gap: 0.55rem; }
  .matching-column { gap: 0.55rem; }
  .matching-card { min-height: 4.55rem; padding: 0.65rem 0.45rem; }
  .matching-game-title { font-size: 1.35rem; }
}

/* Fill-in-the-blank */
.fill-blank-wrap { display: flex; flex-direction: column; gap: 0.75rem; }
.fill-blank-input {
  background: var(--c-surface2);
  border: 2px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 0.9rem 1.1rem;
  font-family: var(--f-code);
  font-size: 1rem;
  color: var(--c-text);
  outline: none;
  transition: border-color 0.15s;
}
.fill-blank-input:focus { border-color: var(--c-primary-l); }
.fill-blank-input.correct { border-color: var(--c-correct); background: rgba(40,167,69,0.08); }
.fill-blank-input.wrong   { border-color: var(--c-wrong);   background: rgba(220,53,69,0.08); }
.hint-text {
  font-size: 0.82rem;
  color: var(--c-text-3);
  font-style: italic;
}

/* Explanation callout */
.explanation-box {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  background: rgba(26,107,92,0.12);
  border-left: 3px solid var(--c-primary);
  border-radius: var(--r-sm);
  font-size: 0.88rem;
  color: var(--c-text);
  animation: fadeSlide 0.3s ease;
}
.explanation-box .expl-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}
.feedback-bar { border-left-width: 4px; }
.feedback-bar.is-correct {
  border: 1px solid rgba(40, 167, 69, 0.35);
  border-left: 4px solid var(--c-correct);
  background: rgba(40, 167, 69, 0.1);
}
.feedback-bar.is-wrong {
  border: 1px solid rgba(220, 53, 69, 0.35);
  border-left: 4px solid var(--c-wrong);
  background: rgba(220, 53, 69, 0.08);
}
.feedback-answer {
  margin-bottom: 0.7rem;
  color: var(--c-text);
  font-weight: 700;
}
.feedback-answer strong { color: var(--c-text); }
.explanation-box .mistake-bank-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.7rem;
  padding: 0.6rem 0.9rem;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.04);
  color: #fff;
  font-size: 0.92rem;
}
body.theme-light .explanation-box .mistake-bank-link {
  background: rgba(0,0,0,0.04);
  color: #111;
  border-color: rgba(0,0,0,0.08);
}

/* ─── LESSON FOOTER BUTTONS ───────────────────────────────── */
.lesson-footer {
  flex: 0 0 auto;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--c-border);
  background: var(--c-bg);
}
.btn-primary {
  width: 100%;
  background: var(--c-primary);
  color: #fff;
  border: none;
  border-radius: var(--r-lg);
  padding: 1rem;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--f-body);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  letter-spacing: 0.02em;
}
.btn-primary:hover { background: var(--c-primary-l); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { background: var(--c-border); color: var(--c-text-3); cursor: default; }
.btn-primary.accent-btn { background: var(--c-accent); color: #1A1200; }
.btn-primary.accent-btn:hover { background: var(--c-accent-l); }

/* ─── COMPLETE SCREEN ─────────────────────────────────────── */
.complete-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.75rem 1.25rem;
  text-align: center;
  gap: 1.1rem;
}
.lesson-complete-screen {
  justify-content: flex-start;
  padding-top: 1.2rem;
  gap: 1rem;
}
.complete-icon { font-size: 4rem; margin-bottom: 0.5rem; }
.lesson-complete-screen .complete-icon {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  margin-bottom: 0;
  border: 2px solid var(--c-correct);
  border-radius: 50%;
  background: rgba(47,191,113,0.15);
  color: #7DE89A;
  font-family: var(--f-display);
  font-size: 2.2rem;
}
.complete-title {
  font-family: var(--f-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-accent);
}
.lesson-complete-screen .complete-title {
  max-width: 30rem;
  font-size: 1.35rem;
  line-height: 1.22;
}
.complete-subtitle { color: var(--c-text-2); font-size: 0.95rem; }
.lesson-complete-screen .complete-subtitle {
  max-width: 30rem;
  line-height: 1.4;
}
.completion-score-card,
.next-mission-card {
  width: min(100%, 30rem);
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
}
.completion-score-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  background: var(--c-surface);
}
.completion-score-card div {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem;
}
.completion-score-card div + div {
  border-left: 1px solid var(--c-border);
}
.completion-score-card span,
.next-mission-card span {
  color: var(--c-text-3);
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.completion-score-card strong {
  color: var(--c-accent);
  font-family: var(--f-display);
  font-size: 1.15rem;
}
.next-mission-card {
  display: grid;
  gap: 0.3rem;
  padding: 0.95rem 1rem;
  border-color: rgba(47,191,113,0.75);
  background: linear-gradient(135deg, rgba(47,191,113,0.18), rgba(127,219,202,0.08));
  text-align: left;
}
.next-mission-card strong {
  color: var(--c-text);
  font-family: var(--f-display);
  font-size: 1rem;
}
.next-mission-card em {
  color: var(--c-text-2);
  font-size: 0.8rem;
  font-style: normal;
}
.compact-stat-row {
  margin-top: 0;
}
.unlock-banner {
  width: min(100%, 28rem);
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 1rem;
  background: rgba(40, 167, 69, 0.12);
  border: 2px solid var(--c-correct);
  border-radius: var(--r-md);
  color: var(--c-text);
}
.unlock-banner span {
  color: var(--c-correct);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.unlock-banner strong { font-family: var(--f-display); }
.xp-badge {
  background: rgba(245,166,35,0.15);
  border: 2px solid var(--c-accent);
  border-radius: var(--r-lg);
  padding: 0.75rem 2rem;
  font-family: var(--f-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--c-accent);
}
.stat-row {
  display: flex;
  gap: 1rem;
  margin: 0.5rem 0;
}
.stat-chip {
  flex: 1;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 0.75rem;
  text-align: center;
}
.stat-chip__val {
  font-family: var(--f-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--c-text);
}
.stat-chip__lbl {
  font-size: 0.72rem;
  color: var(--c-text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.lesson-recap,
.confidence-panel {
  width: min(100%, 30rem);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 0.85rem;
}
.lesson-recap__label,
.confidence-panel__label {
  margin-bottom: 0.5rem;
  color: var(--c-accent);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.lesson-recap__items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: center;
}
.lesson-recap__items span {
  border: 1px solid var(--c-border);
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  color: var(--c-text-2);
  font-size: 0.78rem;
  font-weight: 700;
}
.confidence-panel__actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45rem;
}
.confidence-btn {
  min-height: 44px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  background: var(--c-surface2);
  color: var(--c-text);
  font-weight: 800;
  cursor: pointer;
}
.confidence-btn.selected {
  border-color: var(--c-accent);
  background: rgba(245,166,35,0.18);
  color: var(--c-accent);
}
body.theme-light .lesson-recap,
body.theme-light .confidence-panel {
  background: #FFFFFF;
  border-color: #B5C2CE;
}
body.theme-light .completion-score-card,
body.theme-light .next-mission-card {
  background: #FFFFFF;
  border-color: #B5C2CE;
}
body.theme-light .next-mission-card {
  background: linear-gradient(135deg, #DDF5E6, #FFFFFF);
  border-color: #65B982;
}
body.theme-light .lesson-recap__items span,
body.theme-light .confidence-btn {
  background: #F7FAFC;
  border-color: #B5C2CE;
  color: #25384A;
}
body.theme-light .confidence-btn.selected {
  background: #FFF1D5;
  border-color: #B96E00;
  color: #7A4700;
}

/* ─── REFERENCE SCREEN ────────────────────────────────────── */
.ref-scroll { overflow-y: auto; flex: 1; min-height: 0; padding: 1rem; }

.ref-search {
  background: var(--c-surface2);
  border: 2px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 0.75rem 1rem;
  font-family: var(--f-body);
  font-size: 0.95rem;
  color: var(--c-text);
  width: 100%;
  outline: none;
  margin-bottom: 1rem;
  transition: border-color 0.15s;
}
.ref-search:focus { border-color: var(--c-primary-l); }
.ref-search::placeholder { color: var(--c-text-3); }

.ref-category { margin-bottom: 1.25rem; }
.ref-category-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-3);
  margin-bottom: 0.5rem;
  padding-left: 0.25rem;
}
.ref-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  margin-bottom: 0.5rem;
  overflow: hidden;
  transition: border-color 0.15s;
}
.ref-card:hover { border-color: var(--c-primary-l); }

.ref-card__toggle {
  width: 100%;
  background: none;
  border: none;
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  text-align: left;
}
.ref-code {
  font-family: var(--f-code);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-accent);
  min-width: 56px;
}
.ref-name {
  flex: 1;
  font-size: 0.9rem;
  color: var(--c-text);
}
.ref-chevron {
  color: var(--c-text-3);
  font-size: 0.75rem;
  transition: transform 0.2s;
}
.ref-card.open .ref-chevron { transform: rotate(90deg); }

.ref-card__body {
  display: none;
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--c-border);
}
.ref-card.open .ref-card__body { display: block; }
.ref-card__body p { font-size: 0.88rem; margin-top: 0.75rem; }
.ref-card__body pre { font-size: 0.8rem; }
.ref-toolbar { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; }
.ref-learned-toggle { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.82rem; color: var(--c-text-2); cursor: pointer; }
.ref-learned-toggle input { accent-color: var(--c-primary); }
.ref-badge { display: inline-block; margin-left: auto; padding: 0.18rem 0.45rem; border-radius: 999px; background: rgba(40,167,69,0.18); color: #7DE89A; font-size: 0.68rem; font-weight: 800; letter-spacing: 0.08em; }
.ref-badge--learned { background: rgba(40,167,69,0.18); color: #7DE89A; }
.ref-card--learned { border-color: rgba(120,144,164,0.32); background: rgba(40,167,69,0.04); }
.ref-card__actions { margin-top: 0.75rem; }
.ref-action { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.45rem 0.7rem; border-radius: var(--r-md); border: 1px solid var(--c-border); background: var(--c-surface2); color: var(--c-text); font-size: 0.82rem; cursor: pointer; }
.ref-action--learned[aria-pressed="true"] { border-color: var(--c-correct); color: #7DE89A; }

/* ─── PRACTICE SCREEN ─────────────────────────────────────── */
.practice-scroll {
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  padding: 0 1rem 1rem;
}
.practice-hero {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 -1rem 1.25rem;
  padding: 1.5rem 1.25rem 1.35rem;
  background: linear-gradient(180deg, #49BFE8 0%, #2A9FD0 100%);
  color: #06131D;
}
.practice-kicker {
  font-family: var(--f-display);
  font-size: 1.9rem;
  font-weight: 800;
  color: #FFFFFF;
}
.practice-title {
  margin-top: 0.35rem;
  color: rgba(255,255,255,0.88);
  font-weight: 800;
}
.practice-hero-mark {
  width: 68px;
  height: 68px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  background: rgba(255,255,255,0.24);
  border: 2px solid rgba(255,255,255,0.35);
  color: #FFFFFF;
  font-family: var(--f-display);
  font-weight: 900;
}
.practice-section-label {
  margin: 0.15rem 0 0.7rem;
  color: var(--c-text-3);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.practice-card {
  position: relative;
  width: 100%;
  min-height: 102px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
  padding: 1.05rem 1rem;
  border: 3px solid rgba(120,144,164,0.28);
  border-radius: 14px;
  background: rgba(19,32,43,0.92);
  color: var(--c-text);
  text-align: left;
  cursor: pointer;
  box-shadow: inset 0 -2px 0 rgba(0,0,0,0.28);
}
.practice-card:active:not(:disabled) {
  transform: translateY(1px);
}
.practice-card:disabled {
  cursor: default;
  opacity: 0.52;
}
.practice-card strong,
.practice-card em {
  display: block;
}
.practice-card strong {
  font-family: var(--f-display);
  font-size: 1.1rem;
  line-height: 1.25;
}
.practice-card em {
  margin-top: 0.3rem;
  color: var(--c-text-3);
  font-size: 0.84rem;
  font-style: normal;
  font-weight: 700;
}
.practice-card__icon {
  flex: 0 0 auto;
  min-width: 64px;
  color: #38C7EA;
  font-family: var(--f-display);
  font-size: 1.8rem;
  font-weight: 900;
  text-align: center;
}
.practice-card__badge {
  position: absolute;
  right: 0.8rem;
  top: -0.6rem;
  min-width: 36px;
  padding: 0.2rem 0.48rem;
  border-radius: 999px;
  background: #EF5570;
  color: #FFFFFF;
  font-size: 0.7rem;
  font-weight: 900;
  text-align: center;
}
body.theme-light .practice-scroll {
  background: #F7FAFC;
}
body.theme-light .practice-card {
  background: #FFFFFF;
  border-color: #C8D5DF;
  color: #172838;
}
body.theme-light .practice-card em {
  color: #405467;
}

/* ─── PROGRESS SCREEN ────────────────────────────────────── */
.progress-scroll { overflow-y: auto; flex: 1; min-height: 0; padding: 1rem; }
body.theme-light #screen-progress {
  background: linear-gradient(180deg, #EEF3F7 0%, #F7FAFC 48%, #EEF4F8 100%);
}

.prog-hero {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  padding: 1.5rem;
  text-align: center;
  margin-bottom: 1rem;
}
.prog-hero__total {
  font-family: var(--f-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--c-accent);
  line-height: 1;
}
.prog-hero__label {
  font-size: 0.82rem;
  color: var(--c-text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.25rem;
}

.prog-unit-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 1rem;
  margin-bottom: 0.75rem;
}
.mistake-bank-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 1rem;
  margin-bottom: 1rem;
}
.mistake-bank-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.mistake-bank-card__kicker {
  color: var(--c-accent);
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.mistake-bank-card__title {
  margin-top: 0.2rem;
  color: var(--c-text);
  font-family: var(--f-display);
  font-weight: 700;
}
.mistake-bank-card__btn {
  min-height: 38px;
  padding: 0 0.85rem;
  border: 0;
  border-radius: var(--r-sm);
  background: var(--c-primary);
  color: #FFFFFF;
  font-weight: 800;
  cursor: pointer;
}
.mistake-bank-card__btn:disabled {
  opacity: 0.5;
  cursor: default;
}
.mistake-bank-list {
  display: grid;
  gap: 0.5rem;
}
.mistake-bank-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  background: var(--c-surface2);
}
.mistake-bank-item strong {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.mistake-bank-item span,
.mistake-bank-empty {
  color: var(--c-text-3);
  font-size: 0.78rem;
}
.mistake-bank-empty {
  padding: 0.6rem 0;
}
body.theme-light .mistake-bank-card {
  background: linear-gradient(180deg, #FFFFFF 0%, #F7FAFC 100%);
  border-color: #A9B9C7;
}
body.theme-light .mistake-bank-item {
  background: #FFFFFF;
  border-color: #C8D5DF;
}
.prog-unit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}
.prog-unit-name {
  font-family: var(--f-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-text);
}
.prog-pct {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--c-accent);
}
.prog-bar {
  height: 6px;
  background: var(--c-border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}
.prog-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  border-radius: 999px;
  transition: width 0.6s ease;
}
.prog-lessons-done { font-size: 0.8rem; color: var(--c-text-3); }

.roadmap-phase {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 0.85rem 1rem;
  margin-bottom: 0.75rem;
}
.roadmap-phase__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}
.roadmap-phase__name {
  font-family: var(--f-display);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--c-text);
}
.roadmap-phase__count {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--c-accent);
}
.roadmap-phase__note {
  font-size: 0.76rem;
  color: var(--c-text-3);
  margin-bottom: 0.6rem;
}
.roadmap-item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.45rem 0.2rem;
  border-top: 1px solid var(--c-border);
  font-size: 0.85rem;
  color: var(--c-text);
  cursor: pointer;
}
.roadmap-item input {
  margin-top: 0.15rem;
  width: 1.05rem;
  height: 1.05rem;
  accent-color: var(--c-primary);
  flex: 0 0 auto;
}
.roadmap-item.done span {
  color: var(--c-text-3);
  text-decoration: line-through;
}
.roadmap-lanes__head {
  font-family: var(--f-display);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--c-text);
  margin: 1rem 0 0.5rem;
}
.roadmap-lane {
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  padding: 0.6rem 0.7rem;
  margin-bottom: 0.5rem;
}
.roadmap-lane__title {
  font-weight: 700;
  color: var(--c-accent);
  font-size: 0.84rem;
}
.roadmap-lane__body {
  font-size: 0.78rem;
  color: var(--c-text-3);
  margin-top: 0.2rem;
}
body.theme-light .roadmap-phase { background: #FFFFFF; border-color: #C8D5DF; }
body.theme-light .roadmap-lane { background: #F7FAFC; border-color: #D6E0E8; }

.streak-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
.streak-flame { font-size: 2rem; }
.streak-val {
  font-family: var(--f-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-accent);
}
.streak-lbl { font-size: 0.82rem; color: var(--c-text-3); }

body.theme-light .prog-hero,
body.theme-light .streak-card {
  background: linear-gradient(180deg, #FFFFFF 0%, #F3F7FA 100%);
  border-color: #A9B9C7;
  box-shadow: 0 8px 22px rgba(35,52,68,0.1), inset 0 1px 0 rgba(255,255,255,0.95);
}
body.theme-light .prog-hero__total,
body.theme-light .streak-val {
  color: #8A5200;
  text-shadow: 0 1px 0 #FFFFFF;
}
body.theme-light .prog-hero__label,
body.theme-light .streak-lbl {
  color: #5D6D7D;
}
body.theme-light .prog-unit-card {
  background: linear-gradient(180deg, #FFFFFF 0%, #F7FAFC 100%);
  border-color: #A9B9C7;
  box-shadow: 0 7px 18px rgba(35,52,68,0.09), inset 0 1px 0 rgba(255,255,255,0.95);
}
body.theme-light .prog-unit-name {
  color: #12212E;
}
body.theme-light .prog-pct {
  color: #7A4700;
}
body.theme-light .prog-bar {
  height: 7px;
  background: #C7D3DE;
  box-shadow: inset 0 1px 2px rgba(35,52,68,0.14);
}
body.theme-light .prog-bar-fill {
  background: linear-gradient(90deg, #176B5D 0%, #6F7A21 58%, #B96E00 100%);
  box-shadow: 0 1px 3px rgba(138,82,0,0.22);
}
body.theme-light .prog-lessons-done {
  color: #405467;
}

.sw-update-banner {
  margin: 0.75rem 1rem 1rem;
  padding: 0.85rem;
  border: 1px solid rgba(245,166,35,0.35);
  border-radius: var(--r-md);
  background: rgba(245,166,35,0.12);
  color: var(--c-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.92rem;
  font-weight: 700;
}
.sw-update-btn {
  border: 0;
  border-radius: var(--r-sm);
  background: var(--c-primary);
  color: #FFFFFF;
  min-height: 2.35rem;
  padding: 0 0.9rem;
  font: 800 0.82rem var(--f-body);
  cursor: pointer;
  box-shadow: 0 2px 0 rgba(0,0,0,0.18);
}
.sw-update-btn:active {
  transform: translateY(1px);
  box-shadow: none;
}
body.theme-light .sw-update-banner {
  background: #FFF4DE;
  border-color: #E7C98C;
  color: #1A2026;
}
body.theme-light .sw-update-btn {
  background: #1A6B5C;
  color: #FFFFFF;
}
/* ─── SETTINGS SCREEN ────────────────────────────────────── */
.settings-scroll { overflow-y: auto; flex: 1; min-height: 0; padding: 1rem; }
.settings-header {
  padding: 0.75rem 0.25rem 1rem;
}
.settings-title {
  font-family: var(--f-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--c-text);
}
.settings-subtitle {
  font-size: 0.86rem;
  color: var(--c-text-3);
  margin-top: 0.15rem;
}
.setup-note {
  display: none;
  position: relative;
  margin: 0 0 1rem;
  padding: 1.05rem;
  background: linear-gradient(135deg, rgba(33, 126, 106, 0.2), rgba(245, 166, 35, 0.12)), var(--c-surface);
  border: 1px solid rgba(127, 219, 202, 0.38);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-card);
}
body.setup-required .setup-note {
  display: block;
}
.setup-note::before {
  content: "[ G ]";
  position: absolute;
  right: 1rem;
  top: 0.85rem;
  font-family: var(--f-display);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--c-primary-light);
}
.setup-note__eyebrow {
  max-width: calc(100% - 4rem);
  font-family: var(--f-display);
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--c-accent);
}
.setup-note__title {
  margin-top: 0.6rem;
  font-family: var(--f-display);
  font-size: clamp(1.32rem, 7vw, 2rem);
  line-height: 1.08;
  font-weight: 800;
  color: var(--c-text);
}
.setup-note__body {
  margin-top: 0.55rem;
  font-size: 0.95rem;
  line-height: 1.45;
  color: var(--c-text-2);
}
body.theme-light .setup-note {
  background: linear-gradient(135deg, rgba(33, 126, 106, 0.12), rgba(245, 166, 35, 0.12)), #FFFFFF;
  border-color: rgba(33, 126, 106, 0.32);
}
.setup-disclaimer {
  margin: 0 0 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid rgba(246, 178, 77, 0.42);
  border-radius: var(--r-md);
  background: rgba(246, 178, 77, 0.08);
  color: var(--c-text-2);
  font-size: 0.84rem;
  line-height: 1.5;
}
.setup-disclaimer strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--c-accent);
  font-family: var(--f-display);
}
.setup-disclaimer p { margin: 0; }
body.theme-light .setup-disclaimer {
  border-color: rgba(138, 82, 0, 0.35);
  background: rgba(245, 166, 35, 0.1);
}
.settings-group {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  margin-bottom: 1rem;
  overflow: hidden;
}
.settings-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  padding: 1rem;
  border-bottom: 1px solid var(--c-border);
}
.settings-row:last-child { border-bottom: 0; }
.settings-label {
  font-weight: 700;
  color: var(--c-text);
}
.settings-help {
  font-size: 0.8rem;
  color: var(--c-text-3);
  margin-top: 0.15rem;
}
.settings-segment {
  min-height: 44px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 4px;
}
.settings-choice {
  min-height: 38px;
  border: 0;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--c-text-2);
  font-family: var(--f-body);
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
}
.settings-choice.active {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 1px 8px rgba(0,0,0,0.18);
}
.build-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  color: var(--c-text-2);
}
.build-row strong {
  font-family: var(--f-display);
  color: var(--c-accent);
}
.settings-danger-group {
  border-color: rgba(239, 85, 112, 0.36);
}
.settings-danger-row {
  align-items: center;
}
.settings-danger-btn {
  min-height: 42px;
  border: 1px solid rgba(239, 85, 112, 0.6);
  border-radius: var(--r-sm);
  background: rgba(239, 85, 112, 0.12);
  color: #FF8CA1;
  font-family: var(--f-body);
  font-size: 0.86rem;
  font-weight: 800;
  cursor: pointer;
}
.settings-danger-btn:active {
  transform: translateY(1px);
}
body.theme-light .settings-danger-group {
  border-color: rgba(196, 44, 72, 0.3);
}
body.theme-light .settings-danger-btn {
  background: rgba(196, 44, 72, 0.08);
  color: #A92B43;
}
.setup-complete-btn { display: none; }
body.setup-required .setup-complete-btn { display: block; }

/* ─── VISUAL AIDS (inline SVG diagrams) ──────────────────── */
.visual-aid {
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 1rem;
  margin: 1rem 0;
  overflow: hidden;
}
.visual-aid svg { width: 100%; height: auto; display: block; }

/* ─── TOAST NOTIFICATION ─────────────────────────────────── */
.toast {
  position: absolute;
  bottom: calc(var(--bottom-nav-h) + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-text);
  box-shadow: var(--shadow-float);
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 999;
  white-space: nowrap;
  max-width: calc(100vw - 2rem);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.success { border-color: var(--c-correct); color: #7DE89A; }
.toast.error   { border-color: var(--c-wrong);   color: #F0A0A8; }

/* ─── SCROLLBAR STYLING ───────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--c-border); border-radius: 2px; }

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 360px) {
  :root { --nav-h: 56px; }
  h1 { font-size: 1.35rem; }
  .top-bar { gap: 0.55rem; padding: 0 0.75rem; }
  .top-bar__logo { font-size: 0.84rem; gap: 0.3rem; }
  .top-bar__streak, .top-bar__xp { font-size: 0.78rem; }
  .hero-block { padding: 1.25rem 1rem 1rem; }
  .hero-title { font-size: 1.15rem; }
  .motivation-panel { padding-inline: 0.75rem; }
  .motivation-row { grid-template-columns: 1fr; gap: 0.55rem; }
  .unit-card { margin-inline: 0.75rem; }
  .unit-card__lessons { padding-inline: 0.7rem; }
  .unit-card__lessons::before { left: 1.85rem; }
  .lesson-dot { width: 36px; height: 36px; box-shadow: 0 0 0 4px var(--c-surface); }
  .lesson-row__title { font-size: 0.84rem; }
  .lesson-content, .ref-scroll, .progress-scroll, .settings-scroll { padding: 0.85rem; }
  .nav-btn .icon { font-size: 1.65rem; }
  .nav-btn { font-size: 0.76rem; }
}

@media (max-height: 620px) {
  :root {
    --nav-h: 54px;
    --bottom-nav-h: 76px;
  }
  .hero-block { padding: 1.15rem 1rem 0.95rem; }
  .hero-title { font-size: 1.12rem; margin-bottom: 0.75rem; }
  .motivation-panel { padding-top: 0.75rem; }
  .motivation-card { padding: 0.7rem; }
  .badge-strip { padding-top: 0.55rem; }
  .section-label { padding-top: 0.85rem; }
  .unit-card__header { padding: 0.8rem 1rem 0.65rem; }
  .lesson-row { padding: 0.5rem 1rem; }
  .lesson-header { padding: 0.85rem 1rem 0.75rem; }
  .lesson-content { padding: 0.9rem; }
  .lesson-footer { padding: 0.75rem 1rem; }
  .btn-primary { padding: 0.85rem; }
}

@supports not (height: 100dvh) {
  body {
    min-height: 100vh;
  }
  .app-wrapper {
    height: 100vh;
    min-height: 100vh;
  }
  .screen {
    height: calc(100vh - var(--nav-h) - var(--bottom-nav-h));
  }
}

.home-scroll,
.ref-scroll,
.practice-scroll,
.progress-scroll,
.settings-scroll,
.legal-scroll {
  padding-bottom: calc(var(--bottom-nav-h) + env(safe-area-inset-bottom, 0px) + 1rem);
  scroll-padding-bottom: calc(var(--bottom-nav-h) + env(safe-area-inset-bottom, 0px) + 1rem);
}

/* ─── ACCESS GATE ───────────────────────────────────────── */
.screen-access-unlock,
.screen-legal { display: none; }
.screen-access-unlock.active,
.screen-legal.active { display: block; position: fixed; inset: 0; z-index: 1500; background: var(--c-bg); color: var(--c-text); }
.screen-access-unlock.active { overflow-y: auto; }

.auth-wrap {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.auth-title {
  font-family: var(--f-display);
  font-size: clamp(1.25rem, 4vw, 1.65rem);
  font-weight: 800;
  text-align: center;
}
.auth-sub {
  opacity: 0.75;
  font-size: 0.9rem;
  margin: 0.25rem 0 1rem;
  text-align: center;
}
.auth-form {
  width: min(94vw, 420px);
  display: grid;
  gap: 0.6rem;
}
.auth-label {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--c-text-2);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.auth-input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
  background: rgba(255,255,255,0.04);
  color: var(--c-text);
  font-family: var(--f-body);
  font-size: 1rem;
  letter-spacing: 0.12em;
}
body.theme-light .auth-input { background: #F4F7FA; }
.auth-submit { width: 100%; justify-content: center; }
.auth-error {
  min-height: 1.1rem;
  color: #F0A0A8;
  font-size: 0.85rem;
  font-weight: 700;
}
.auth-note {
  text-align: center;
  opacity: 0.65;
  font-size: 0.8rem;
  margin-top: 0.6rem;
}
.auth-note a {
  color: var(--c-primary-light);
  font-weight: 700;
}
.auth-disclaimer {
  width: min(94vw, 420px);
  margin: 0.8rem 0 0;
}

/* ─── LEGAL SCREEN ───────────────────────────────────────── */
.legal-scroll {
  height: 100dvh;
  overflow-y: auto;
  padding: 1rem 1rem calc(var(--bottom-nav-h) + 1.5rem);
}
.legal-card {
  max-width: 860px;
  margin: 0 auto;
  border: 1px solid var(--c-border);
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border-radius: var(--r);
  padding: 1rem;
}
.legal-title {
  font-family: var(--f-display);
  font-size: clamp(1.15rem, 3.4vw, 1.45rem);
  font-weight: 800;
  margin-bottom: 0.6rem;
}
.legal-back-btn {
  margin-bottom: 1rem;
}
.legal-body {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--c-text-2);
  white-space: pre-wrap;
}
.legal-body h2 {
  margin-top: 0.6rem;
  font-size: 1rem;
  color: var(--c-text);
}
.legal-body p {
  margin: 0.55rem 0;
}
.legal-body a {
  color: var(--c-primary-light);
  font-weight: 700;
}
body.theme-light .bottom-nav .nav-btn.active { color: #8A5200 !important; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}