/* ─────────────────────────────────────────────
   HY-Motion Documentation  ·  Style System
   ───────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* palette */
  --bg-deep:       #1a1c24;
  --bg-surface:    #1f2129;
  --bg-card:       #252830;
  --bg-elevated:   #2c2f3a;
  --border-subtle: rgba(255,255,255,0.07);
  --border-accent: rgba(255,165,80,0.25);

  --text-primary:   #e8e6e1;
  --text-secondary: #9a978f;
  --text-muted:     #5e5c56;

  --accent:         #f5a641;
  --accent-glow:    rgba(245,166,65,0.15);
  --accent-hot:     #ff7043;
  --green:          #66d9a0;
  --red:            #f06060;
  --blue:           #62b6e7;
  --purple:         #b388f5;

  /* type */
  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  /* radii */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
}

/* ── Reset ───────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img{max-width:100%;display:block}
a{color: var(--accent);text-decoration:none;transition:color .2s}
a:hover{color: var(--accent-hot)}

/* ── Ambient Background ──────────────────── */
body::before{
  content:'';position:fixed;inset:0;z-index:-1;
  background:
    radial-gradient(ellipse 900px 600px at 15% 10%, rgba(245,166,65,0.06), transparent 70%),
    radial-gradient(ellipse 700px 500px at 85% 80%, rgba(98,182,231,0.04), transparent 70%);
  pointer-events:none;
}

/* ── Layout ──────────────────────────────── */
.page-wrapper{
  max-width: 920px;
  margin: 0 auto;
  padding: 20px 28px 120px;
}

/* ── Navigation ──────────────────────────── */
.doc-nav{
  position: sticky;top:0;z-index:100;
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  background: rgba(26,28,36,0.78);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 28px;
}
.doc-nav__inner{
  max-width: 920px;margin:0 auto;
  display: flex;align-items:center;gap:8px;
  height: 56px;overflow-x:auto;
  scrollbar-width:none;
}
.doc-nav__inner::-webkit-scrollbar{display:none}
.doc-nav a{
  font-family: var(--font-body);
  font-size: .78rem;font-weight:500;
  letter-spacing:.03em;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 40px;
  white-space:nowrap;
  transition: background .2s, color .2s;
}
.doc-nav a:hover,
.doc-nav a.active{
  background: var(--accent-glow);
  color: var(--accent);
}

/* ── Hero ────────────────────────────────── */
.hero{
  text-align:center;
  padding: 80px 0 50px;
}
.hero__badge{
  display:inline-flex;align-items:center;gap:6px;
  font-family: var(--font-mono);font-size:.72rem;font-weight:500;
  color: var(--accent);
  background: var(--accent-glow);
  border:1px solid var(--border-accent);
  padding:5px 16px;border-radius:40px;
  margin-bottom:28px;
  letter-spacing:.04em;
}
.hero h1{
  font-family: var(--font-display);
  font-weight:800;font-size:clamp(2.6rem,5.5vw,4rem);
  line-height:1.08;
  background: linear-gradient(135deg, var(--text-primary) 40%, var(--accent) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
  margin-bottom:20px;
}
.hero__sub{
  font-size:1.1rem;color: var(--text-secondary);
  max-width:560px;margin:0 auto 32px;
  line-height:1.7;
}
.hero__tags{
  display:flex;flex-wrap:wrap;justify-content:center;gap:10px;
}
.hero__tag{
  font-size:.74rem;font-weight:500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  padding:5px 14px;border-radius:40px;
}

/* ── Section ─────────────────────────────── */
.section{margin-top:72px}
.section__label{
  font-family: var(--font-mono);font-size:.68rem;font-weight:500;
  letter-spacing:.12em;text-transform:uppercase;
  color: var(--accent);margin-bottom:8px;
}
.section__title{
  font-family: var(--font-display);font-weight:700;
  font-size:1.7rem;line-height:1.2;
  margin-bottom:12px;
}
.section__desc{
  color: var(--text-secondary);font-size:.95rem;
  max-width:640px;margin-bottom:28px;
}

/* ── Feature Grid ────────────────────────── */
.feature-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:18px;
}
.feature-card{
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-md);
  padding:28px 24px;
  transition: border-color .3s, transform .25s, box-shadow .3s;
}
.feature-card:hover{
  border-color: var(--border-accent);
  transform:translateY(-3px);
  box-shadow:0 8px 30px rgba(0,0,0,0.35);
}
.feature-card__icon{
  width:42px;height:42px;
  border-radius: var(--r-sm);
  display:grid;place-items:center;
  font-size:1.3rem;
  margin-bottom:16px;
}
.feature-card__icon.orange{background:rgba(245,166,65,0.12);color:var(--accent)}
.feature-card__icon.green{background:rgba(102,217,160,0.12);color:var(--green)}
.feature-card__icon.blue{background:rgba(98,182,231,0.12);color:var(--blue)}
.feature-card__icon.purple{background:rgba(179,136,245,0.12);color:var(--purple)}
.feature-card__icon.red{background:rgba(240,96,96,0.12);color:var(--red)}
.feature-card h3{
  font-family: var(--font-display);font-weight:600;font-size:1.05rem;
  margin-bottom:8px;
}
.feature-card p{
  color: var(--text-secondary);font-size:.88rem;line-height:1.65;
}

/* ── Showcase Bento ─────────────────────── */
.showcase-bento{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:12px;
  margin-top:20px;
}
@media(max-width:720px){
  .showcase-bento{grid-template-columns:1fr 1fr}
}
@media(max-width:480px){
  .showcase-bento{grid-template-columns:1fr}
  .showcase-cell--wide{grid-column:auto}
}
.showcase-cell{
  position:relative;
  border-radius: var(--r-md);
  overflow:hidden;
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  aspect-ratio:1/1;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.showcase-cell--wide{
  grid-column: span 2;
  aspect-ratio:2/1;
}
.showcase-cell:hover{
  transform:translateY(-4px);
  box-shadow:0 8px 32px rgba(0,0,0,0.4);
  border-color: var(--border-accent);
}
.showcase-cell video,
.showcase-cell img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.showcase-cell__label{
  position:absolute;bottom:0;left:0;right:0;
  padding:10px 14px;
  background: linear-gradient(transparent, rgba(0,0,0,0.75));
  font-family: var(--font-display);
  font-size:.78rem;font-weight:600;
  color: var(--text-primary);
  letter-spacing:.01em;
}

/* ── Spec Tiers / Cards ──────────────────── */
.tier-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}
@media(max-width:720px){.tier-grid{grid-template-columns:1fr}}

.tier-card{
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-md);
  padding:32px 28px;
  position:relative;overflow:hidden;
}
.tier-card--recommended{border-color: var(--border-accent)}
.tier-card--recommended::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hot));
}
.tier-card__badge{
  display:inline-block;font-family: var(--font-mono);font-size:.65rem;
  font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  padding:3px 10px;border-radius:40px;margin-bottom:14px;
}
.tier-card--recommended .tier-card__badge{background:var(--accent-glow);color:var(--accent)}
.tier-card--fallback .tier-card__badge{background:rgba(98,182,231,0.12);color:var(--blue)}
.tier-card h3{
  font-family: var(--font-display);font-weight:700;font-size:1.2rem;
  margin-bottom:6px;
}
.tier-card__sub{color:var(--text-secondary);font-size:.82rem;margin-bottom:18px}

.spec-list{list-style:none;display:flex;flex-direction:column;gap:12px}
.spec-list li{
  display:flex;gap:12px;align-items:flex-start;
  font-size:.88rem;line-height:1.55;
}
.spec-list li .label{
  flex-shrink:0;font-weight:600;color:var(--text-primary);min-width:110px;
}
.spec-list li .value{color:var(--text-secondary)}

/* general requirements box */
.general-req{
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-md);
  padding:28px 24px;
  margin-bottom:24px;
}
.general-req h3{
  font-family: var(--font-display);font-weight:700;font-size:1.1rem;
  margin-bottom:14px;
}

/* ── Callout ─────────────────────────────── */
.callout{
  border-radius: var(--r-md);
  padding:18px 22px;
  font-size:.88rem;line-height:1.6;
  display:flex;gap:12px;align-items:flex-start;
  margin-top:16px;
}
.callout--warn{
  background: rgba(240,96,96,0.08);
  border:1px solid rgba(240,96,96,0.2);
  color: #f0a0a0;
}
.callout--info{
  background: rgba(98,182,231,0.08);
  border:1px solid rgba(98,182,231,0.2);
  color: #a0d0ef;
}
.callout--tip{
  background: rgba(102,217,160,0.08);
  border:1px solid rgba(102,217,160,0.18);
  color: #a0e8c0;
}
.callout__icon{font-size:1.2rem;flex-shrink:0;line-height:1.5}

/* ── Steps ───────────────────────────────── */
.steps{
  display:flex;flex-direction:column;gap:32px;
  margin-top:20px;
  padding-left:28px;
  border-left:2px solid var(--border-subtle);
}
.step{position:relative}
.step::before{
  content:attr(data-step);
  position:absolute;left:-44px;top:0;
  width:30px;height:30px;
  border-radius:50%;
  background: var(--bg-elevated);
  border:2px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-mono);font-size:.75rem;font-weight:600;
  display:grid;place-items:center;
}
.step h3{
  font-family: var(--font-display);font-weight:600;font-size:1.05rem;
  margin-bottom:6px;
}
.step p, .step ul{
  color: var(--text-secondary);font-size:.9rem;line-height:1.7;
}
.step ul{list-style:disc;padding-left:20px;margin-top:6px}
.step ul li{margin-bottom:4px}

/* ── Image Placeholder ───────────────────── */
.img-placeholder{
  width:100%;
  aspect-ratio:16/9;
  border-radius: var(--r-md);
  border:2px dashed rgba(255,255,255,0.08);
  background: var(--bg-elevated);
  display:grid;place-items:center;
  margin:24px 0;
  color: var(--text-muted);
  font-family: var(--font-mono);font-size:.78rem;
  letter-spacing:.02em;
}

/* ── Limitation List ─────────────────────── */
.limit-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:14px;margin-top:16px;
}
.limit-item{
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-sm);
  padding:18px 20px;
  font-size:.88rem;
}
.limit-item strong{color: var(--text-primary);font-weight:600}
.limit-item p{color: var(--text-secondary);margin-top:4px;line-height:1.6}

/* ── Version Table ───────────────────────── */
.version-table{
  width:100%;border-collapse:collapse;margin-top:16px;
  font-size:.88rem;
}
.version-table th{
  text-align:left;font-family: var(--font-display);font-weight:600;
  color: var(--text-primary);padding:12px 16px;
  border-bottom:2px solid var(--border-subtle);
}
.version-table td{
  padding:12px 16px;color: var(--text-secondary);
  border-bottom:1px solid var(--border-subtle);
}
.version-table tbody tr:hover{background:var(--bg-elevated)}

/* ── License list ────────────────────────── */
.license-grid{
  display:flex;flex-direction:column;gap:14px;margin-top:16px;
}
.license-card{
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-sm);
  padding:20px 22px;
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:12px;
}
.license-card__name{font-weight:600;font-size:.95rem}
.license-card__type{
  font-family: var(--font-mono);font-size:.72rem;
  color: var(--accent);
  background: var(--accent-glow);
  padding:4px 12px;border-radius:40px;
}
.license-card a{font-size:.82rem}

/* ── Guide Grid (Prompting) ──────────────── */
.guide-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:28px;
}
@media(max-width:720px){.guide-grid{grid-template-columns:1fr}}
.guide-card{
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-md);
  padding:26px 24px;
  transition: border-color .3s, box-shadow .3s;
}
.guide-card:hover{
  border-color: var(--border-accent);
  box-shadow:0 4px 24px rgba(0,0,0,0.25);
}
.guide-card__header{
  display:flex;align-items:center;gap:12px;margin-bottom:12px;
}
.guide-card__header h3{
  font-family: var(--font-display);font-weight:600;font-size:1.05rem;
}
.guide-card__icon{
  width:38px;height:38px;
  border-radius: var(--r-sm);
  display:grid;place-items:center;
  font-size:1.15rem;flex-shrink:0;
}
.guide-card__icon.green{background:rgba(102,217,160,0.12);color:var(--green)}
.guide-card__icon.orange{background:rgba(245,166,65,0.12);color:var(--accent)}
.guide-card p{
  color: var(--text-secondary);font-size:.9rem;line-height:1.65;
}

/* ── Unsupported Block ───────────────────── */
.unsupported-block{
  background: var(--bg-card);
  border:1px solid rgba(240,96,96,0.18);
  border-radius: var(--r-md);
  padding:28px 26px;
  margin-bottom:28px;
}
.unsupported-block__title{
  font-family: var(--font-display);font-weight:700;font-size:1.1rem;
  margin-bottom:18px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;
}
.unsupported-block__badge{
  font-family: var(--font-mono);font-size:.65rem;font-weight:600;
  letter-spacing:.08em;text-transform:uppercase;
  background:rgba(240,96,96,0.14);color:var(--red);
  padding:3px 10px;border-radius:40px;
}
.unsupported-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:12px;
}
.unsupported-item{
  display:flex;align-items:flex-start;gap:12px;
  background: var(--bg-elevated);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-sm);
  padding:14px 16px;
  transition: border-color .25s;
}
.unsupported-item:hover{border-color:rgba(240,96,96,0.25)}
.unsupported-item__icon{
  font-size:1rem;flex-shrink:0;line-height:1.6;
}
.unsupported-item strong{
  font-size:.88rem;font-weight:600;color:var(--text-primary);display:block;
}
.unsupported-item p{
  font-size:.82rem;color:var(--text-secondary);margin-top:2px;line-height:1.55;
}

/* ── Example Prompts ─────────────────────── */
.examples-block{
  background: var(--bg-card);
  border:1px solid var(--border-accent);
  border-radius: var(--r-md);
  padding:28px 26px;
  position:relative;overflow:hidden;
}
.examples-block::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hot));
}
.examples-block__title{
  font-family: var(--font-display);font-weight:700;font-size:1.1rem;
  margin-bottom:18px;display:flex;align-items:center;gap:8px;
}
.examples-block__icon{font-size:1.15rem}
.examples-list{display:flex;flex-direction:column;gap:10px}
.example-prompt{
  display:flex;align-items:flex-start;gap:14px;
  background: var(--bg-elevated);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-sm);
  padding:16px 18px;
  transition: border-color .25s, transform .2s;
}
.example-prompt:hover{
  border-color: var(--border-accent);
  transform:translateX(4px);
}
.example-prompt__num{
  font-family: var(--font-mono);font-size:.7rem;font-weight:600;
  color: var(--accent);
  background: var(--accent-glow);
  min-width:28px;height:28px;
  border-radius:50%;
  display:grid;place-items:center;
  flex-shrink:0;
}
.example-prompt p{
  color: var(--text-secondary);font-size:.9rem;line-height:1.6;
  font-style:italic;
}

/* ── UI Walkthrough ──────────────────────── */
.ui-walkthrough{
  display:grid;
  grid-template-columns:1fr 300px;
  gap:24px;
  align-items:start;
  margin-top:20px;
}
@media(max-width:820px){
  .ui-walkthrough{grid-template-columns:1fr;gap:20px}
  .ui-screenshot{order:-1}
}

.ui-cards{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
}
.ui-card--span{grid-column:1 / -1}

.ui-card{
  background: var(--bg-card);
  border:1px solid var(--border-subtle);
  border-radius: var(--r-sm);
  padding:14px 14px 12px;
  transition: border-color .3s, box-shadow .3s;
}
.ui-card:hover{
  border-color: var(--border-accent);
  box-shadow:0 3px 14px rgba(0,0,0,0.25);
}
.ui-card--action{
  border-color: rgba(102,217,160,0.2);
  background: linear-gradient(135deg, var(--bg-card) 70%, rgba(102,217,160,0.04));
}
.ui-card__header{
  display:flex;align-items:center;gap:8px;margin-bottom:6px;
}
.ui-card__header h3{
  font-family: var(--font-display);font-weight:600;font-size:.82rem;
}
.ui-card__icon{
  width:28px;height:28px;
  border-radius:6px;
  display:grid;place-items:center;
  font-size:.9rem;flex-shrink:0;
}
.ui-card p{
  color: var(--text-secondary);font-size:.76rem;line-height:1.55;
}
.ui-card em{color:var(--text-primary);font-style:italic}
.ui-card__meta{
  margin-top:8px;padding-top:7px;
  border-top:1px solid var(--border-subtle);
  font-family: var(--font-mono);font-size:.64rem;
  color: var(--text-muted);line-height:1.6;
}
.ui-card__meta span{color:var(--text-secondary);font-weight:500}
.ui-card__meta code{font-size:.64rem;padding:1px 4px}

.ui-screenshot{position:relative}
.ui-screenshot__sticky{
  position:sticky;top:80px;
}
.ui-screenshot__caption{
  text-align:center;
  color: var(--text-muted);
  font-size:.72rem;
  margin-top:8px;
}

/* ── Footer ──────────────────────────────── */
.doc-footer{
  margin-top:80px;padding-top:32px;
  border-top:1px solid var(--border-subtle);
  text-align:center;
  color: var(--text-muted);font-size:.78rem;
}

/* ── Scroll Reveal ───────────────────────── */
.reveal{
  opacity:0;transform:translateY(22px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ── Code Inline ─────────────────────────── */
code{
  font-family: var(--font-mono);font-size:.84em;
  background: var(--bg-elevated);
  padding:2px 7px;border-radius:5px;
  color: var(--accent);
}

/* ── Responsive ──────────────────────────── */
@media(max-width:600px){
  .page-wrapper{padding:40px 16px 80px}
  .hero{padding:50px 0 30px}
  .hero h1{font-size:2rem}
  .section{margin-top:48px}
  .steps{padding-left:24px}
  .step::before{left:-38px;width:26px;height:26px;font-size:.65rem}
}