@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700&family=Playfair+Display:ital,wght@1,600&display=swap");

:root {
  color-scheme: light;
  --page: #f4f1e8;
  --paper: #fbfaf4;
  --ink: #17231e;
  --muted: #647068;
  --line: #ced1c7;
  --soft: #e8e6dc;
  --dark: #1d2b25;
  --accent: #dfff4f;
  --green: #36d888;
  --orange: #ff9b4a;
  --danger: #df5a4f;
  --shadow: 0 28px 80px rgba(26, 39, 32, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #101612;
  --paper: #17201b;
  --ink: #eef3eb;
  --muted: #9eaaa2;
  --line: #37423b;
  --soft: #222d27;
  --dark: #e8ff62;
  --accent: #dfff4f;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 80% 8%, rgba(223, 255, 79, 0.15), transparent 24rem),
    var(--page);
  color: var(--ink);
  font-family: "DM Sans", "Noto Sans SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

button, a { font: inherit; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }

.site-header {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1240px;
  padding: 24px 32px;
}

.brand { align-items: center; display: flex; gap: 12px; }
.brand-mark {
  align-items: center;
  background: var(--dark);
  border-radius: 50%;
  color: var(--page);
  display: flex;
  font-size: 18px;
  font-weight: 700;
  height: 42px;
  justify-content: center;
  width: 42px;
}
:root[data-theme="dark"] .brand-mark { color: #17231e; }
.brand strong, .brand small { display: block; line-height: 1.05; }
.brand strong { font-size: 15px; letter-spacing: 0.02em; }
.brand small { color: var(--muted); font-size: 11px; margin-top: 4px; }

nav { align-items: center; display: flex; gap: 28px; }
nav a { color: var(--muted); font-size: 13px; font-weight: 600; }
nav a:hover { color: var(--ink); }
.icon-button {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
  height: 38px;
  width: 38px;
}

.hero {
  align-items: end;
  display: grid;
  gap: 64px;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
  margin: 0 auto;
  max-width: 1240px;
  min-height: 650px;
  padding: 90px 32px 110px;
}
.hero-copy { min-width: 0; }

.eyebrow, .section-index {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.eyebrow { align-items: center; display: flex; gap: 10px; }
.eyebrow span { background: var(--ink); border-radius: 50%; height: 7px; width: 7px; }

h1 {
  font-size: clamp(56px, 8.2vw, 112px);
  letter-spacing: -0.065em;
  line-height: 0.94;
  margin: 28px 0 34px;
  max-width: 900px;
}
h1 em {
  color: var(--muted);
  font-family: "Playfair Display", "Noto Sans SC", serif;
  font-weight: 600;
}
.hero-lead { color: var(--muted); font-size: 17px; line-height: 1.85; max-width: 590px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 38px; }

.button {
  align-items: center;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  font-size: 14px;
  font-weight: 700;
  gap: 18px;
  justify-content: center;
  min-height: 50px;
  padding: 0 25px;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}
.button:hover:not(:disabled) { transform: translateY(-2px); }
.button.primary { background: var(--dark); color: var(--page); }
:root[data-theme="dark"] .button.primary { color: #17231e; }
.button.ghost { background: transparent; border-color: var(--line); }
.button:disabled { cursor: wait; opacity: 0.55; }

.hero-aside { padding-bottom: 10px; }
.orbit {
  align-items: center;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin: 0 0 55px auto;
  max-width: 210px;
  position: relative;
}
.orbit::before {
  background: var(--accent);
  border: 6px solid var(--page);
  border-radius: 50%;
  content: "";
  height: 22px;
  position: absolute;
  right: 9%;
  top: 13%;
  width: 22px;
}
.orbit span { font-size: 52px; font-weight: 700; letter-spacing: -0.06em; }
.orbit small { color: var(--muted); }
.hero-aside dl { margin: 0; }
.hero-aside dl div { border-top: 1px solid var(--line); display: flex; justify-content: space-between; padding: 15px 0; }
.hero-aside dt { color: var(--muted); font-size: 12px; }
.hero-aside dd { font-size: 12px; font-weight: 700; margin: 0; }

.section-shell { margin: 0 auto; max-width: 1240px; padding: 110px 32px; }
.experience { background: var(--paper); border-radius: var(--radius-lg); box-shadow: var(--shadow); max-width: 1320px; padding-left: 72px; padding-right: 72px; }
.section-heading { align-items: end; display: flex; justify-content: space-between; margin-bottom: 44px; }
.section-heading h2 { font-size: clamp(38px, 5vw, 66px); letter-spacing: -0.05em; margin: 8px 0 0; }
.section-note { color: var(--muted); font-size: 13px; line-height: 1.7; max-width: 310px; text-align: right; }

.model-status { align-items: center; display: flex; font-size: 12px; gap: 10px; }
.model-status span { background: var(--orange); border-radius: 50%; height: 9px; width: 9px; }
.model-status.loading span { animation: pulse 1.2s infinite; }
.model-status.ready span { background: var(--green); }
.model-status.error span { background: var(--danger); }
@keyframes pulse { 50% { opacity: 0.25; transform: scale(0.75); } }

.demo-grid { display: grid; gap: 28px; grid-template-columns: minmax(0, 1.55fr) minmax(320px, 0.8fr); }
.camera-stage {
  aspect-ratio: 4 / 3;
  background: #101713;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}
.camera-video, .skeleton-canvas {
  height: 100%;
  left: 0;
  object-fit: cover;
  position: absolute;
  top: 0;
  transform: scaleX(-1);
  width: 100%;
}
.camera-video { display: none; }
.skeleton-canvas { pointer-events: none; }
.camera-placeholder {
  align-items: center;
  color: #e8eee9;
  display: flex;
  flex-direction: column;
  inset: 0;
  justify-content: center;
  padding: 30px;
  position: absolute;
  text-align: center;
}
.camera-placeholder::before {
  background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 42px 42px;
  content: "";
  inset: 0;
  position: absolute;
}
.camera-placeholder > * { position: relative; }
.camera-placeholder strong { font-size: 16px; margin: 14px 0 7px; }
.camera-placeholder small { color: #9aa59e; line-height: 1.6; }
.hand-glyph { filter: grayscale(1); font-size: 44px; opacity: 0.9; }
.camera-topline { display: flex; justify-content: space-between; left: 16px; pointer-events: none; position: absolute; right: 16px; top: 16px; }
.live-badge, .fps-label { backdrop-filter: blur(12px); background: rgba(8, 13, 10, .64); border: 1px solid rgba(255,255,255,.13); border-radius: 999px; color: white; font-size: 10px; font-weight: 700; padding: 8px 11px; }
.live-badge i { background: #8b958e; border-radius: 50%; display: inline-block; height: 6px; margin-right: 5px; width: 6px; }
.live-badge.active i { animation: pulse 1.2s infinite; background: var(--green); }
.camera-controls { display: flex; gap: 10px; margin-top: 17px; }
.control-main { flex: 1; }
.button-icon { font-size: 9px; }
.privacy-note { color: var(--muted); font-size: 11px; line-height: 1.6; margin: 15px 3px 0; }

.result-panel { border: 1px solid var(--line); border-radius: var(--radius-md); display: flex; flex-direction: column; overflow: hidden; }
.current-result { padding: 32px; }
.result-label { color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .14em; margin: 0; text-transform: uppercase; }
.result-word { font-size: clamp(48px, 6vw, 78px); font-weight: 700; letter-spacing: -.07em; line-height: 1; margin: 32px 0 10px; min-height: 78px; }
.result-hint { color: var(--muted); font-size: 12px; margin: 0 0 30px; min-height: 18px; }
.confidence-row { display: flex; font-size: 11px; justify-content: space-between; }
.confidence-track { background: var(--soft); border-radius: 99px; height: 5px; margin-top: 9px; overflow: hidden; }
.confidence-track span { background: var(--green); display: block; height: 100%; transition: width 120ms linear; width: 0; }
.sentence-box { background: var(--soft); border-bottom: 1px solid var(--line); border-top: 1px solid var(--line); flex: 1; padding: 25px 32px; }
.sentence-heading { align-items: center; display: flex; font-size: 11px; font-weight: 700; justify-content: space-between; letter-spacing: .08em; }
.text-button { background: transparent; border: 0; color: var(--muted); cursor: pointer; font-size: 11px; padding: 0; }
.text-button:disabled { cursor: default; opacity: .4; }
.word-chips { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 19px; min-height: 29px; }
.word-chip { background: var(--paper); border: 1px solid var(--line); border-radius: 99px; font-size: 12px; font-weight: 700; padding: 6px 11px; }
.empty-copy { color: var(--muted); font-size: 11px; }
.polished-sentence { font-size: 15px; font-weight: 600; line-height: 1.7; margin: 18px 0 0; }
.session-stats { display: grid; grid-template-columns: repeat(3, 1fr); padding: 21px 16px; }
.session-stats div { align-items: center; display: flex; flex-direction: column; gap: 4px; text-align: center; }
.session-stats div + div { border-left: 1px solid var(--line); }
.session-stats strong { font-size: 17px; }
.session-stats span { color: var(--muted); font-size: 9px; }
.alert-box { background: rgba(223, 90, 79, .1); border: 1px solid rgba(223, 90, 79, .3); border-radius: 12px; color: var(--danger); font-size: 13px; margin-top: 20px; padding: 14px 17px; }

.gesture-grid { display: grid; gap: 14px; grid-template-columns: repeat(4, 1fr); }
.gesture-card { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; transition: transform 180ms ease, box-shadow 180ms ease; }
.gesture-card:hover { box-shadow: 0 16px 38px rgba(24, 36, 29, .1); transform: translateY(-4px); }
.gesture-card figure { aspect-ratio: 4 / 3; background: var(--soft); margin: 0; overflow: hidden; }
.gesture-card figure { position: relative; }
.gesture-card img { height: 100%; object-fit: cover; transition: transform 250ms ease; width: 100%; }
.gesture-card:hover img { transform: scale(1.035); }
.gesture-card figcaption { align-items: center; display: flex; justify-content: space-between; padding: 16px 17px; }
.gesture-card strong { font-size: 17px; }
.gesture-card span { color: var(--muted); font-size: 10px; text-transform: uppercase; }
.custom-badge { background: var(--accent); border-radius: 99px; color: #17231e !important; font-size: 9px !important; font-weight: 700; left: 10px; padding: 6px 9px; position: absolute; top: 10px; }
.gesture-card-actions { align-items: center; display: flex; gap: 8px; }
.delete-gesture { background: transparent; border: 0; color: var(--muted); cursor: pointer; font-size: 15px; line-height: 1; padding: 3px; }
.delete-gesture:hover { color: var(--danger); }

.training-section { padding-top: 55px; }
.training-grid { background: var(--dark); border-radius: var(--radius-lg); color: var(--page); display: grid; gap: 70px; grid-template-columns: minmax(0, .8fr) minmax(420px, 1.2fr); padding: 64px; }
:root[data-theme="dark"] .training-grid { color: #17231e; }
.training-lead { font-size: 20px; font-weight: 500; line-height: 1.65; margin: 0; max-width: 470px; }
.training-steps { list-style: none; margin: 38px 0 0; padding: 0; }
.training-steps li { align-items: center; border-top: 1px solid rgba(255,255,255,.18); display: flex; font-size: 12px; gap: 13px; padding: 14px 0; }
:root[data-theme="dark"] .training-steps li { border-color: rgba(23,35,30,.2); }
.training-steps li span { align-items: center; border: 1px solid currentColor; border-radius: 50%; display: inline-flex; font-size: 9px; height: 22px; justify-content: center; opacity: .72; width: 22px; }
.training-card { align-self: center; background: var(--paper); border-radius: var(--radius-md); color: var(--ink); padding: 30px; }
.training-card > label { display: block; font-size: 11px; font-weight: 700; letter-spacing: .08em; margin-bottom: 10px; }
.training-input-row { display: flex; gap: 9px; }
.training-input-row input { background: var(--soft); border: 1px solid var(--line); border-radius: 999px; color: var(--ink); flex: 1; font: inherit; font-size: 14px; min-width: 0; outline: none; padding: 0 19px; }
.training-input-row input:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(54,216,136,.12); }
.training-input-row input:disabled { opacity: .55; }
.training-progress-head { display: flex; font-size: 11px; justify-content: space-between; margin-top: 27px; }
.training-progress-head span { color: var(--muted); }
.training-progress { background: var(--soft); border-radius: 99px; height: 8px; margin-top: 10px; overflow: hidden; }
.training-progress span { background: linear-gradient(90deg, var(--green), var(--accent)); display: block; height: 100%; transition: width 150ms ease; width: 0; }
.training-actions { align-items: center; display: flex; justify-content: space-between; margin-top: 14px; }
.training-actions p { color: var(--muted); font-size: 10px; line-height: 1.5; margin: 0; }
.danger-text { color: var(--danger); flex: none; margin-left: 14px; }

.how-it-works { padding-top: 40px; }
.process-list { border-top: 1px solid var(--line); list-style: none; margin: 0; padding: 0; }
.process-list li { align-items: center; border-bottom: 1px solid var(--line); display: grid; gap: 28px; grid-template-columns: 55px 1fr; padding: 27px 2px; }
.process-list > li > span { color: var(--muted); font-size: 11px; }
.process-list strong { font-size: 18px; }
.process-list p { color: var(--muted); font-size: 13px; margin: 6px 0 0; }

footer { border-top: 1px solid var(--line); display: flex; justify-content: space-between; margin: 30px auto 0; max-width: 1176px; padding: 32px 0 46px; }
footer p { color: var(--muted); font-size: 11px; margin: 0; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 70px; }
  .hero-aside { display: none; }
  .experience { border-radius: 0; padding-left: 32px; padding-right: 32px; }
  .demo-grid { grid-template-columns: 1fr; }
  .gesture-grid { grid-template-columns: repeat(3, 1fr); }
  .training-grid { gap: 42px; grid-template-columns: 1fr; padding: 48px; }
  footer { margin-left: 32px; margin-right: 32px; }
}

@media (max-width: 680px) {
  .site-header { padding: 18px 20px; }
  nav a { display: none; }
  nav { gap: 8px; }
  .hero { padding: 74px 20px 86px; }
  h1 { font-size: clamp(46px, 13vw, 58px); }
  .hero-lead { font-size: 15px; }
  .section-shell, .experience { padding: 78px 20px; }
  .section-heading { align-items: start; flex-direction: column; gap: 18px; }
  .section-note { text-align: left; }
  .camera-stage { aspect-ratio: 3 / 4; }
  .camera-controls { align-items: stretch; flex-direction: column; }
  .camera-controls .button { width: 100%; }
  .current-result, .sentence-box { padding-left: 24px; padding-right: 24px; }
  .gesture-grid { grid-template-columns: repeat(2, 1fr); }
  .gesture-card figcaption { padding: 13px; }
  .gesture-card strong { font-size: 15px; }
  .training-grid { padding: 28px 20px; }
  .training-input-row { align-items: stretch; flex-direction: column; }
  .training-input-row input { flex: none; height: 50px; width: 100%; }
  .training-input-row .button { width: 100%; }
  footer { flex-direction: column; gap: 8px; margin-left: 20px; margin-right: 20px; }
}

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