/* style.css */
:root {
  color-scheme: light;
  --bg: #f4f0e8;
  --panel: rgba(255,253,249,.93);
  --panel-solid: #fffdf9;
  --panel-2: #f2eee5;
  --text: #202933;
  --muted: #66727d;
  --faint: #8c958e;
  --line: #ded9cf;
  --line-bright: #c9c1b5;
  --accent: #b36e26;
  --accent-soft: rgba(179,110,38,.1);
  --accent-2: #317e78;
  --success: #397f5c;
  --danger: #ad5048;
  --shadow: 0 24px 70px rgba(71,57,38,.12);
  --radius: 17px;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f0e8;
  --panel: rgba(255,253,249,.93);
  --panel-solid: #fffdf9;
  --panel-2: #f2eee5;
  --text: #202933;
  --muted: #66727d;
  --faint: #8c958e;
  --line: #ded9cf;
  --line-bright: #c9c1b5;
  --accent: #b36e26;
  --accent-soft: rgba(179,110,38,.1);
  --accent-2: #317e78;
  --success: #397f5c;
  --danger: #ad5048;
  --shadow: 0 24px 70px rgba(71,57,38,.12);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d1117;
  --panel: rgba(21,28,38,.9);
  --panel-solid: #151c26;
  --panel-2: #1b2531;
  --text: #edf2f7;
  --muted: #9aa8b8;
  --faint: #687789;
  --line: #2a3746;
  --line-bright: #3a4b5d;
  --accent: #e9b872;
  --accent-soft: rgba(233,184,114,.13);
  --accent-2: #83c5be;
  --success: #83c5a3;
  --danger: #dd8b82;
  --shadow: 0 24px 80px rgba(0,0,0,.24);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    linear-gradient(rgba(70,58,42,.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(70,58,42,.028) 1px, transparent 1px),
    radial-gradient(circle at 7% 0%, rgba(49,126,120,.1), transparent 29rem),
    radial-gradient(circle at 96% 13%, rgba(179,110,38,.09), transparent 27rem),
    var(--bg);
  background-size: 44px 44px, 44px 44px, auto, auto, auto;
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

:root[data-theme="dark"] body {
  background:
    linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px),
    radial-gradient(circle at 7% 0%, rgba(131,197,190,.14), transparent 29rem),
    radial-gradient(circle at 96% 13%, rgba(233,184,114,.11), transparent 27rem),
    var(--bg);
  background-size: 44px 44px, 44px 44px, auto, auto, auto;
}

button { font: inherit; cursor: pointer; }
button:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent-2) 45%, transparent); outline-offset: 3px; }
button:disabled { cursor: not-allowed; opacity: .42; }

.ambient {
  position: fixed;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(80px);
  opacity: .08;
  z-index: -1;
}
.ambient-one { top: 40%; left: -250px; background: var(--accent-2); }
.ambient-two { right: -240px; bottom: 4%; background: var(--accent); }

.app-shell {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 25px;
}

.topbar, .brand, .panel-heading, .lesson-header, .example-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
}

.brand { justify-content: flex-start; gap: 16px; }
.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 50px;
  height: 50px;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 15px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  box-shadow: inset 0 0 0 4px var(--accent-soft);
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  width: 7px;
  height: 7px;
  right: -3px;
  top: -3px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 4px var(--bg);
}

h1, h2, h3, p { margin-top: 0; }
h1, h2, .lesson-principle, .example-text, .streak-number, .progress-percent, .move-card h3 {
  font-family: Georgia, serif;
}
h1 {
  max-width: 650px;
  margin-bottom: 0;
  font-weight: 500;
  font-size: clamp(1.65rem, 4vw, 2.85rem);
  line-height: 1.06;
  letter-spacing: -.045em;
}
h2 { margin-bottom: 0; font-size: 1.4rem; line-height: 1.13; font-weight: 500; letter-spacing: -.02em; }
h3 { margin-bottom: 7px; font-size: 1rem; line-height: 1.3; }

.eyebrow {
  color: var(--accent);
  margin-bottom: 8px;
  font-size: .66rem;
  font-weight: 800;
  letter-spacing: .17em;
}
.ghost-btn, .secondary-btn, .primary-btn {
  min-height: 44px;
  border-radius: 10px;
  padding: 0 15px;
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(255,255,255,.015);
  font-size: .79rem;
  font-weight: 750;
  transition: .2s ease;
}
.ghost-btn:hover, .secondary-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.intro { margin: 48px 0 31px; max-width: 800px; }
.intro-copy { position: relative; padding-left: 18px; }
.intro-copy::before {
  content: "";
  position: absolute;
  inset: 3px auto 4px 0;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(var(--accent), var(--accent-2));
}
.intro-kicker {
  margin-bottom: 8px;
  color: var(--accent-2);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.intro-copy > p:last-child { color: var(--muted); font-size: 1.04rem; max-width: 710px; }
.principle-strip { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 21px; }
.principle-strip span {
  padding: 6px 11px;
  border: 1px solid var(--line);
  color: var(--faint);
  border-radius: 99px;
  font-size: .7rem;
  font-weight: 700;
  background: rgba(255,255,255,.018);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.learning-layout {
  display: grid;
  grid-template-columns: minmax(230px,.72fr) minmax(0,1.65fr);
  gap: 21px;
  align-items: start;
}
.progress-panel { padding: 21px; position: sticky; top: 18px; }
.progress-percent { color: var(--accent); font-size: 1.1rem; }
.progress-track {
  height: 7px;
  margin: 19px 0 10px;
  overflow: hidden;
  border-radius: 10px;
  background: var(--line);
}
.progress-track i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg,var(--accent-2),var(--accent));
  transition: width .4s ease;
}
.progress-copy { min-height: 42px; color: var(--faint); font-size: .75rem; }
.lesson-nav { display: grid; gap: 5px; margin: 20px -8px 22px; }
.lesson-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 54px;
  padding: 8px;
  border: 1px solid transparent;
  border-radius: 10px;
  text-align: left;
  color: var(--muted);
  background: transparent;
}
.lesson-nav-item:hover, .lesson-nav-item.active { color: var(--text); border-color: var(--line); background: var(--panel-2); }
.lesson-nav-item.active { box-shadow: inset 3px 0 var(--accent); }
.nav-number { width: 26px; color: var(--accent); font-family: Georgia,serif; font-size: .82rem; }
.lesson-nav-item strong, .lesson-nav-item small { display: block; }
.lesson-nav-item strong { font-size: .78rem; }
.lesson-nav-item small { margin-top: 2px; color: var(--faint); font-size: .64rem; }
.lesson-nav-item i { margin-left: auto; color: var(--success); font-style: normal; }
.streak-card { display: flex; align-items: center; gap: 11px; padding-top: 16px; border-top: 1px solid var(--line); }
.streak-number { color: var(--accent); font-size: 2rem; line-height: 1; }
.streak-card strong, .streak-card small { display: block; }
.streak-card strong { font-size: .75rem; }
.streak-card small { color: var(--faint); font-size: .65rem; }

.lesson-panel { padding: 27px; }
.lesson-tag {
  padding: 5px 9px;
  border: 1px solid color-mix(in srgb,var(--accent-2) 50%,var(--line));
  border-radius: 99px;
  color: var(--accent-2);
  font-size: .65rem;
  font-weight: 800;
  white-space: nowrap;
}
.lesson-hero {
  display: grid;
  grid-template-columns: 104px 1fr;
  gap: 20px;
  align-items: center;
  min-height: 166px;
  margin: 25px 0 22px;
  padding: 21px;
  border: 1px solid color-mix(in srgb,var(--accent) 32%,var(--line));
  border-radius: 13px;
  background: linear-gradient(120deg,color-mix(in srgb,var(--accent) 9%,var(--panel-solid)),var(--panel));
}
.lesson-orbit { height: 88px; position: relative; animation: drift 7s ease-in-out infinite; }
.lesson-orbit::before, .lesson-orbit::after, .lesson-orbit span {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--accent);
}
.lesson-orbit::before { width: 90px; height: 45px; left: 7px; top: 21px; transform: rotate(25deg); }
.lesson-orbit::after { width: 45px; height: 90px; left: 30px; top: -1px; transform: rotate(25deg); border-color: var(--accent-2); }
.lesson-orbit span { width: 13px; height: 13px; left: 46px; top: 38px; background: var(--accent); box-shadow: 0 0 20px color-mix(in srgb,var(--accent) 45%,transparent); }
.lesson-principle { margin-bottom: 9px; font-size: clamp(1.25rem,2.5vw,1.75rem); line-height: 1.16; }
.lesson-explanation, .move-card p, .notice-card p { margin-bottom: 0; color: var(--muted); font-size: .87rem; }
.lesson-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
.move-card, .notice-card { padding: 17px; border: 1px solid var(--line); border-radius: 11px; background: var(--panel-2); }
.move-card h3 { font-size: 1.08rem; font-weight: 500; }
.notice-card { border-color: color-mix(in srgb,var(--accent-2) 35%,var(--line)); }
.example-block { margin-top: 22px; padding: 18px; border-left: 3px solid var(--accent-2); background: color-mix(in srgb,var(--accent-2) 5%,var(--panel-solid)); }
.example-heading { gap: 12px; }
.example-heading span { color: var(--faint); font-size: .7rem; }
.example-text { margin: 3px 0 10px; font-size: 1.06rem; line-height: 1.45; }
.example-note { margin-bottom: 0; color: var(--muted); font-size: .78rem; }
.lesson-actions { display: flex; gap: 9px; justify-content: space-between; margin-top: 22px; }
.lesson-actions .primary-btn { flex: 1; }
.primary-btn { border-color: var(--accent); background: var(--accent); color: #17130e; box-shadow: 0 7px 18px color-mix(in srgb,var(--accent) 18%,transparent); }
.primary-btn:hover { filter: brightness(1.08); transform: translateY(-1px); }
.primary-btn.completed { background: color-mix(in srgb,var(--success) 75%,var(--panel-solid)); border-color: var(--success); color: #102017; }

.quiz-panel { display: grid; grid-template-columns: .9fr 1.1fr; gap: 24px; margin-top: 21px; padding: 24px; }
.quiz-intro h2 { margin-bottom: 10px; }
.quiz-intro > p:last-child { margin-bottom: 0; color: var(--muted); font-size: .85rem; }
.quiz-options { display: grid; gap: 8px; }
.quiz-option {
  display: flex;
  align-items: center;
  gap: 11px;
  min-height: 48px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  background: var(--panel-2);
  text-align: left;
  font-size: .8rem;
  transition: .2s ease;
}
.quiz-option:hover:not(:disabled) { border-color: var(--accent); color: var(--text); transform: translateX(2px); }
.quiz-option > span { display: grid; place-items: center; flex: 0 0 25px; height: 25px; border-radius: 50%; color: var(--accent); border: 1px solid var(--line-bright); font-size: .7rem; font-weight: 800; }
.quiz-option.correct { border-color: var(--success); color: var(--success); }
.quiz-option.incorrect { border-color: var(--danger); color: var(--danger); }
.quiz-feedback { grid-column: 2; min-height: 0; color: var(--muted); font-size: .78rem; }
.quiz-feedback.positive { color: var(--success); }
.quiz-feedback.gentle { color: var(--accent); }
.text-btn { grid-column: 2; justify-self: start; padding: 0; border: 0; color: var(--accent); background: none; font-size: .78rem; font-weight: 800; }
.hidden { display: none !important; }

footer { display: flex; justify-content: space-between; gap: 15px; margin-top: 22px; color: var(--faint); font-size: .7rem; }
.footer-dot { display: inline-block; width: 6px; height: 6px; margin: 0 7px 1px 1px; border-radius: 50%; background: var(--accent-2); }

@keyframes drift {
  0%,100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-5px) rotate(2deg); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; }
}

@media (max-width: 800px) {
  .learning-layout { grid-template-columns: 1fr; }
  .progress-panel { position: static; }
  .lesson-nav { grid-template-columns: repeat(2,1fr); gap: 5px; }
  .quiz-panel { grid-template-columns: 1fr; }
  .quiz-feedback, .text-btn { grid-column: 1; }
}

@media (max-width: 520px) {
  .app-shell { width: min(100% - 22px,1160px); padding-top: 20px; }
  .topbar { gap: 9px; }
  .brand { gap: 11px; }
  .brand-mark { flex-basis: 40px; height: 40px; border-radius: 12px; font-size: 10px; }
  h1 { font-size: 1.48rem; }
  .ghost-btn { padding: 0 10px; font-size: .71rem; }
  .intro { margin-top: 32px; }
  .panel { border-radius: 13px; }
  .progress-panel, .lesson-panel, .quiz-panel { padding: 17px; }
  .lesson-nav { grid-template-columns: 1fr; }
  .lesson-hero { grid-template-columns: 1fr; text-align: center; }
  .lesson-orbit { width: 110px; margin: 0 auto; }
  .lesson-grid { grid-template-columns: 1fr; }
  .lesson-actions { flex-wrap: wrap; }
  .lesson-actions .primary-btn { order: -1; flex-basis: 100%; }
  footer { flex-direction: column; gap: 4px; }
}