/* Sherka Companion — project site. Visual language follows docs/images/sherka-ecosystem-en.png. */

:root {
  color-scheme: dark;
  --bg: #0b1119;
  --bg-2: #0f1722;
  --panel: rgba(22, 32, 45, 0.72);
  --panel-solid: #141e2a;
  --line: rgba(232, 196, 138, 0.16);
  --line-strong: rgba(232, 196, 138, 0.42);
  --gold: #e8c48a;
  --gold-hi: #f6dcae;
  --gold-deep: #b98444;
  --gold-fill: #3a2b1a;
  --cream: #f5ead6;
  --text: #d9dee4;
  --muted: #98a4b1;
  --faint: #6f7c8a;
  --teal: #7fd1b9;
  --teal-fill: #12302b;
  --led: #8fd6a8;
  --radius: 18px;
  --wrap: 1180px;
  --display: "Inter Tight", "Inter", "Segoe UI", system-ui, sans-serif;
  --body: "Inter", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold-hi); }
img { max-width: 100%; height: auto; display: block; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; border-radius: 6px; }

.wrap { width: min(var(--wrap), 100% - 32px); margin-inline: auto; }

/* Night sky: glow, faint grid and scattered stars */
.sky {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(900px 600px at 70% 18%, rgba(211, 154, 88, 0.10), transparent 70%),
    radial-gradient(700px 500px at 10% 80%, rgba(80, 130, 160, 0.07), transparent 70%),
    radial-gradient(1px 1px at 12% 22%, rgba(255, 240, 210, .55), transparent 2px),
    radial-gradient(1px 1px at 33% 64%, rgba(255, 240, 210, .4), transparent 2px),
    radial-gradient(1.5px 1.5px at 58% 12%, rgba(255, 240, 210, .5), transparent 2px),
    radial-gradient(1px 1px at 78% 48%, rgba(255, 240, 210, .4), transparent 2px),
    radial-gradient(1px 1px at 91% 82%, rgba(255, 240, 210, .45), transparent 2px),
    radial-gradient(1.5px 1.5px at 46% 88%, rgba(255, 240, 210, .35), transparent 2px),
    radial-gradient(1px 1px at 4% 52%, rgba(255, 240, 210, .4), transparent 2px),
    linear-gradient(rgba(232, 196, 138, 0.025) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(90deg, rgba(232, 196, 138, 0.025) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 50%, var(--bg) 100%);
}

/* Type */
h1, h2, h3 { font-family: var(--display); color: var(--cream); margin: 0; }
h1 {
  font-size: clamp(2.5rem, 5.2vw, 4.4rem);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.035em;
  text-transform: uppercase;
}
h2 {
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}
h3 { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; }

.gold-text {
  background: linear-gradient(100deg, var(--gold-hi), var(--gold) 45%, var(--gold-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow, .caps, .card-label, .tag, .chip, .tagline, .foot-motto, .nav, .brand, .pill {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 22px;
  color: var(--gold);
  font-size: 0.78rem;
}
.caps { font-size: 0.74rem; color: var(--muted); letter-spacing: 0.14em; margin: 6px 0 0; }
.faint { color: var(--faint); }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 34em; margin: 26px 0 0; }
.sub { color: var(--muted); font-size: 1.08rem; max-width: 40em; margin: 18px 0 0; }
.fine { color: var(--faint); font-size: 0.86rem; }

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 10px var(--gold);
  flex: none;
}
.spark { width: 34px; height: 34px; fill: url(#starFill); filter: drop-shadow(0 0 8px rgba(232, 168, 98, .55)); flex: none; }
.spark.sm { width: 22px; height: 22px; }

/* Header */
.top {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(11, 17, 25, 0.72);
  border-bottom: 1px solid var(--line);
}
.top-inner { display: flex; align-items: center; gap: 24px; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--gold); font-size: 0.8rem; }
.brand .spark { width: 26px; height: 26px; }
.nav { display: flex; gap: 26px; margin-left: auto; font-size: 0.72rem; }
.nav a { color: var(--muted); }
.nav a:hover { color: var(--gold-hi); }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 0.7rem;
}
.pill-gold-outline { border: 1px solid var(--line-strong); background: rgba(58, 43, 26, 0.45); color: var(--gold); }
.pill-gold-outline:hover { border-color: var(--gold); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.98rem;
  transition: transform .2s, box-shadow .2s, border-color .2s, background .2s;
}
.btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn-gold {
  background: linear-gradient(180deg, #f2d29e, #e1b06e);
  color: #221b11;
  box-shadow: 0 8px 30px rgba(225, 176, 110, 0.25), inset 0 1px 0 rgba(255, 255, 255, .4);
}
.btn-gold:hover { color: #221b11; transform: translateY(-1px); box-shadow: 0 10px 38px rgba(225, 176, 110, 0.38), inset 0 1px 0 rgba(255, 255, 255, .4); }
.btn-ghost { border: 1px solid var(--line-strong); color: var(--cream); background: rgba(20, 30, 42, .5); }
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-hi); }
.btn-lg { min-height: 56px; font-size: 1.05rem; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }

.chips { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 30px 0 0; }
.chip {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  border: 1px solid #b59864;
  background: #171a1d;
  color: var(--cream);
}
.chip-gold { background: var(--gold); border-color: var(--gold); color: #221b11; }

/* Corner brackets, as on the diagram frame */
.corner { position: absolute; width: 46px; height: 46px; border: 1px solid var(--line-strong); pointer-events: none; }
.corner.tl { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.corner.tr { top: 0; right: 0; border-left: 0; border-bottom: 0; }
.corner.br { bottom: 0; right: 0; border-left: 0; border-top: 0; }

/* Hero */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  align-items: center;
  gap: 32px;
  padding: 72px 28px 88px;
  margin-top: 28px;
}
.hero-orb { position: relative; }
.orb { width: 100%; max-width: 540px; margin-inline: auto; display: block; overflow: visible; }
.orb-word { font: 800 64px var(--display); letter-spacing: 0.06em; fill: var(--cream); }
.orb-sub { font: 600 20px var(--body); letter-spacing: 0.55em; fill: var(--gold); }
.orb-word.small { font-size: 38px; }
.orb-sub.small { font-size: 12px; letter-spacing: 0.5em; }

.orbit { transform-origin: 0 0; animation: spin 60s linear infinite; }
.orbit.o2 { animation-duration: 38s; animation-direction: reverse; }
.orbit.o3 { animation-duration: 90s; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Sections */
.section { padding: 96px 0; position: relative; }
.section-head { margin-bottom: 52px; }

/* Cards: same frame as the diagram's capability panels */
.card {
  position: relative;
  background: linear-gradient(180deg, rgba(28, 40, 55, 0.78), rgba(18, 27, 38, 0.82));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.03);
}
.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 28px;
  width: 2px;
  height: 38px;
  border-radius: 2px;
  background: linear-gradient(var(--gold), transparent);
  opacity: .8;
}
.card-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.74rem;
  color: var(--muted);
  margin-bottom: 18px;
}
.led {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid rgba(143, 214, 168, .35);
  display: grid;
  place-items: center;
}
.led::after { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--led); box-shadow: 0 0 8px var(--led); }
.led-gold { border-color: rgba(232, 196, 138, .35); }
.led-gold::after { background: var(--gold); box-shadow: 0 0 8px var(--gold); }

.card-title { display: flex; align-items: center; gap: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.card-title h3 { font-size: 2.1rem; }
.icon {
  width: 72px;
  height: 72px;
  flex: none;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: rgba(10, 16, 24, 0.6);
  border: 1px solid var(--line);
}
.icon svg { width: 44px; height: 44px; fill: none; stroke: var(--gold); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }

.tags { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 18px 0 0; }
.tag {
  flex: 1 1 auto;
  text-align: center;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  border: 1px solid rgba(152, 164, 177, .28);
  color: var(--text);
}
.tag-gold { background: var(--gold-fill); border-color: rgba(232, 196, 138, .45); color: var(--gold-hi); }
.tag-teal { background: var(--teal-fill); border-color: rgba(127, 209, 185, .35); color: var(--teal); }

/* Ecosystem diagram */
.eco {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.85fr) minmax(0, 1fr);
  grid-template-areas:
    "llm core voice"
    "local core comfy";
  gap: 36px 56px;
  align-items: center;
}
.eco-llm { grid-area: llm; }
.eco-local { grid-area: local; }
.eco-voice { grid-area: voice; }
.eco-comfy { grid-area: comfy; }
.eco-core { grid-area: core; position: relative; z-index: 1; }
.eco-core svg { width: 100%; overflow: visible; filter: drop-shadow(0 0 40px rgba(211, 154, 88, .18)); }
.eco .card { z-index: 1; }
.eco-links { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; z-index: 0; pointer-events: none; }
.eco-links path { fill: none; stroke: var(--gold); stroke-width: 1.6; stroke-linecap: round; filter: drop-shadow(0 0 5px rgba(232, 196, 138, .7)); }
.eco-links .trail { stroke-dasharray: 2 8; stroke-opacity: .45; filter: none; }

.local-head { display: flex; align-items: center; gap: 18px; }
.local-head svg { width: 40px; height: 44px; fill: none; stroke: var(--cream); stroke-width: 2.2; }
.local-head .fill { fill: var(--cream); stroke: none; }
.local-head h3 { font-size: 2.3rem; font-weight: 800; text-transform: uppercase; letter-spacing: -0.03em; }
.eco-local p:not(.caps) { font-size: 1.15rem; color: var(--text); margin: 14px 0 18px; }
.eco-local::before { top: -1px; left: 22px; width: 120px; height: 2px; background: linear-gradient(90deg, rgba(127, 209, 185, .7), transparent); }

.tagline {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 16px;
  list-style: none;
  padding: 30px 0 0;
  margin: 64px 0 0;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  color: var(--cream);
}
.tagline li { display: flex; align-items: center; gap: 16px; }
.tagline li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 10px var(--gold); }

/* Companions */
.cast { display: grid; grid-template-columns: 1.1fr 1fr; gap: 28px; align-items: stretch; }
.cast-stage { display: flex; flex-direction: column; }
.portrait {
  position: relative;
  aspect-ratio: 1;
  max-width: 420px;
  width: 100%;
  margin: 0 auto;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 45%, rgba(232, 196, 138, .16), rgba(232, 196, 138, .03) 55%, transparent 70%);
}
.portrait::after {
  content: "";
  position: absolute;
  inset: 6%;
  border-radius: 50%;
  border: 1px dashed rgba(232, 196, 138, .18);
  pointer-events: none;
}
.portrait img {
  position: absolute;
  inset: 4%;
  width: 92%;
  height: 92%;
  object-fit: contain;
  opacity: 0;
  transition: opacity .5s ease;
  filter: drop-shadow(0 18px 30px rgba(0, 0, 0, .45));
}
.portrait img.on { opacity: 1; }
.cast-meta { text-align: center; margin: 12px 0 18px; }
.cast-meta h3 { font-size: 2.2rem; font-weight: 800; text-transform: uppercase; letter-spacing: .02em; }
.cast-meta p { color: var(--muted); margin: 6px 0 0; }

.moods { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: auto; }
.mood {
  font: 600 0.66rem var(--body);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid rgba(152, 164, 177, .28);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all .2s;
}
.mood:hover { color: var(--cream); border-color: var(--line-strong); }
.mood[aria-checked="true"] { background: var(--gold-fill); border-color: rgba(232, 196, 138, .6); color: var(--gold-hi); }

.cast-list { display: grid; gap: 12px; align-content: start; }
.cast-item {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 12px 16px;
  text-align: left;
  color: var(--text);
  font: inherit;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(20, 30, 42, .55);
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.cast-item:hover { border-color: var(--line-strong); }
.cast-item[aria-selected="true"] { border-color: rgba(232, 196, 138, .6); background: rgba(58, 43, 26, .35); box-shadow: inset 2px 0 0 var(--gold); }
.cast-item img { width: 60px; height: 60px; object-fit: contain; flex: none; }
.cast-item .num { font-size: .7rem; letter-spacing: .2em; color: var(--faint); font-weight: 600; }
.cast-item strong { display: block; font-family: var(--display); font-size: 1.2rem; color: var(--cream); }
.cast-item span:not(.num) { color: var(--muted); font-size: .92rem; }
.note { color: var(--muted); margin: 28px 0 0; max-width: 52em; }
.note strong { color: var(--cream); font-weight: 600; }

/* Feature grid */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feat p { margin: 0; color: var(--muted); }
.feat h3 { margin-bottom: 10px; }
.feat .card-label { color: var(--gold); }

/* Scenes */
.split { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: center; }
.split .section-head { margin: 0; }
.checks { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 12px; }
.checks li { display: flex; gap: 14px; color: var(--text); }
.checks li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; margin-top: .65em; flex: none; background: var(--gold); box-shadow: 0 0 10px var(--gold); }
.shots { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.shot { margin: 0; border-radius: 16px; overflow: hidden; border: 1px solid var(--line-strong); box-shadow: 0 30px 60px rgba(0, 0, 0, .4); }
.shot.offset { transform: translateY(48px); }

/* Create */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: none; }
.step .num { font: 800 3rem var(--display); color: transparent; -webkit-text-stroke: 1px var(--gold); display: block; margin-bottom: 14px; line-height: 1; }
.step h3 { font-size: 1.35rem; margin-bottom: 10px; }
.step p { color: var(--muted); margin: 0; }
.panel-shot { margin: 28px 0 0; padding: 14px; }
.panel-shot::before { display: none; }
.panel-shot img { border-radius: 10px; width: 100%; }
.panel-shot figcaption { text-align: center; margin: 14px 0 4px; }

/* Get started */
.start {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 56px;
  background:
    radial-gradient(600px 300px at 85% 50%, rgba(211, 154, 88, .14), transparent 70%),
    linear-gradient(180deg, rgba(28, 40, 55, 0.85), rgba(18, 27, 38, 0.9));
  border-color: var(--line-strong);
}
.start::before { display: none; }
.start-list { margin: 26px 0 18px; padding-left: 1.4em; display: grid; gap: 10px; color: var(--muted); }
.start-list strong { color: var(--cream); font-weight: 600; }
.start-list li::marker { color: var(--gold); font-weight: 700; }
.start-cta { display: grid; gap: 12px; }

/* Footer */
.foot { text-align: center; padding: 48px 0 64px; border-top: 1px solid var(--line); color: var(--muted); font-size: .92rem; }
.foot p { margin: 0 0 10px; }
.foot-motto { color: var(--faint); font-size: .72rem; letter-spacing: .3em; margin-bottom: 18px !important; }
.foot .fine { max-width: 46em; margin-inline: auto; }

/* Responsive */
@media (max-width: 1020px) {
  .nav { display: none; }
  .brand { margin-right: auto; }
  .hero { grid-template-columns: 1fr; padding: 48px 20px 64px; text-align: left; }
  .hero-orb { max-width: 440px; margin: 0 auto; width: 100%; }
  .eco {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "core core"
      "llm voice"
      "local comfy";
  }
  .eco-core { max-width: 320px; margin: 0 auto; }
  .eco-links { display: none; }
  .cast { grid-template-columns: 1fr; }
  .cast-list { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .grid-3, .steps { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
  .start { grid-template-columns: 1fr; padding: 40px 32px; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .top-inner { height: 60px; }
  .brand span { display: none; }
  .hero { padding: 36px 4px 48px; margin-top: 8px; }
  .hero .corner { display: none; }
  .cta .btn { width: 100%; }
  .section { padding: 64px 0; }
  .eco { grid-template-columns: 1fr; grid-template-areas: "core" "llm" "voice" "comfy" "local"; gap: 18px; }
  .eco-core { max-width: 240px; }
  .card { padding: 22px 20px; }
  .card-title h3 { font-size: 1.7rem; }
  .icon { width: 58px; height: 58px; }
  .icon svg { width: 36px; height: 36px; }
  .grid-3, .steps { grid-template-columns: 1fr; }
  .cast-list { grid-template-columns: 1fr; }
  .shots { grid-template-columns: 1fr; }
  .shot.offset { transform: none; }
  .start { padding: 32px 22px; }
  .tagline { justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orbit { animation: none; }
  .portrait img { transition: none; }
}

/* Video overview */
.video-frame {
  padding: 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}
.video-frame video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border-radius: calc(var(--radius) - 8px);
  background: #000;
}