/* ==========================================================================
   KST Index design system.
   Ported from the sibling site /opt/caici.web (same design house): Orbitron +
   Inter, near-black backgrounds, cyan/teal/gold glow, glass cards, the
   battery-segment motif. KST additions: leaderboard table, score badge with
   integrity-multiplier and catastrophic-deception treatment, construct bars.
   ========================================================================== */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #0d0d14;
  --bg-card: rgba(14, 14, 22, 0.85);
  --border-subtle: rgba(56, 189, 248, 0.08);
  --border-glow: rgba(56, 189, 248, 0.25);

  --text-primary: #e8eaed;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --cyan-400: #22d3ee;
  --cyan-500: #06b6d4;
  --cyan-600: #0891b2;
  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;

  --gold-400: #fbbf24;
  --gold-500: #f59e0b;
  --gold-600: #d97706;
  --amber-glow: rgba(251, 191, 36, 0.3);

  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --battery-cycle: 8s;
  --segment-count: 14;

  /* KST additions */
  --danger: #f87171;
  --danger-glow: rgba(248, 113, 113, 0.3);
  --score-low: #f87171;
  --score-mid: #fbbf24;
  --score-high: #2dd4bf;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

a { color: var(--cyan-400); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--teal-400); }

/* ===== Animated background ===== */
.bg-canvas { position: fixed; inset: 0; z-index: 0; overflow: hidden; pointer-events: none; }
.bg-gradient {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(6, 182, 212, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(59, 130, 246, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(20, 184, 166, 0.04) 0%, transparent 50%),
    var(--bg-primary);
  animation: bg-shift 20s ease-in-out infinite alternate;
}
@keyframes bg-shift {
  0% { background-position: 0% 0%, 0% 0%, 0% 0%; opacity: 1; }
  50% { opacity: 0.85; }
  100% { background-position: 10% 5%, -5% -3%, 5% -5%; opacity: 1; }
}
.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(56, 189, 248, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: grid-pulse 8s ease-in-out infinite;
}
@keyframes grid-pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 0.8; } }
.bg-orb { position: absolute; border-radius: 50%; filter: blur(80px); animation: orb-drift 25s ease-in-out infinite; }
.bg-orb--1 { width: 400px; height: 400px; background: rgba(6, 182, 212, 0.05); top: 10%; left: -5%; animation-duration: 30s; }
.bg-orb--2 { width: 300px; height: 300px; background: rgba(59, 130, 246, 0.04); top: 60%; right: -5%; animation-delay: -10s; animation-duration: 25s; }
.bg-orb--3 { width: 250px; height: 250px; background: rgba(20, 184, 166, 0.04); bottom: 5%; left: 30%; animation-delay: -5s; animation-duration: 22s; }
@keyframes orb-drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -20px) scale(1.05); }
  50% { transform: translate(-20px, 30px) scale(0.95); }
  75% { transform: translate(20px, 20px) scale(1.02); }
}

/* ===== Layout ===== */
.page { position: relative; z-index: 1; }
.container { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 1.5rem; }
.container--narrow { max-width: 820px; }
section { padding: 4rem 0; }

/* ===== Scroll reveal ===== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.8s cubic-bezier(0.16,1,0.3,1), transform 0.8s cubic-bezier(0.16,1,0.3,1); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.fade-in { opacity: 0; transform: translateY(24px); animation: element-fade-in 0.9s cubic-bezier(0.16,1,0.3,1) forwards; }
.fade-in--1 { animation-delay: 0.1s; } .fade-in--2 { animation-delay: 0.25s; }
.fade-in--3 { animation-delay: 0.4s; } .fade-in--4 { animation-delay: 0.55s; }
@keyframes element-fade-in { to { opacity: 1; transform: translateY(0); } }

/* ===== Top nav ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 10, 15, 0.82); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav__brand { font-family: var(--font-display); font-weight: 800; font-size: 1.15rem; letter-spacing: 0.08em;
  background: linear-gradient(135deg, var(--cyan-400) 0%, var(--teal-400) 45%, var(--cyan-500) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.nav__links { display: flex; gap: 1.5rem; align-items: center; }
.nav__link { font-size: 0.9rem; color: var(--text-secondary); letter-spacing: 0.02em; }
.nav__link:hover, .nav__link.is-active { color: var(--cyan-400); }
.nav__cta { font-family: var(--font-display); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.04em;
  padding: 0.45rem 0.9rem; border: 1px solid var(--border-glow); border-radius: 8px; color: var(--cyan-400); }
.nav__cta:hover { background: rgba(34, 211, 238, 0.08); }
.nav__toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; }
.nav__toggle span { display: block; width: 22px; height: 2px; background: var(--cyan-400); transition: 0.25s; }
@media (max-width: 820px) {
  .nav__links { position: fixed; inset: 64px 0 auto 0; flex-direction: column; align-items: flex-start;
    gap: 0; padding: 1rem 1.5rem; background: rgba(10,10,15,0.97); border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-120%); transition: transform 0.3s ease; }
  .nav__links.is-open { transform: translateY(0); }
  .nav__links .nav__link, .nav__links .nav__cta { width: 100%; padding: 0.75rem 0; border: none; }
  .nav__toggle { display: flex; }
}

/* ===== Typography ===== */
.display { font-family: var(--font-display); font-weight: 800; line-height: 1.1; letter-spacing: 0.01em; }
.gradient-text {
  background: linear-gradient(135deg, var(--cyan-400) 0%, var(--teal-400) 45%, var(--cyan-500) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.eyebrow { font-family: var(--font-display); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--cyan-500); margin-bottom: 1rem; }
h1.hero__title { font-size: clamp(2.4rem, 6vw, 4rem); margin-bottom: 1rem; }
h2.section__title { font-size: clamp(1.6rem, 3.4vw, 2.4rem); margin-bottom: 0.75rem; }
h3 { font-family: var(--font-display); font-weight: 600; margin-bottom: 0.5rem; }
.lede { font-size: clamp(1.05rem, 1.8vw, 1.25rem); color: var(--text-secondary); max-width: 65ch; }
p { color: var(--text-secondary); margin-bottom: 1rem; }
.muted { color: var(--text-muted); }
.prose p, .prose li { color: var(--text-secondary); }
.prose h2 { margin: 2.5rem 0 0.75rem; } .prose h3 { margin: 1.75rem 0 0.5rem; color: var(--text-primary); }
.prose ul, .prose ol { margin: 0 0 1rem 1.25rem; } .prose li { margin-bottom: 0.4rem; }
.prose strong { color: var(--text-primary); }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.88em;
  background: rgba(56,189,248,0.07); padding: 0.1em 0.4em; border-radius: 4px; color: var(--cyan-400); }

/* ===== Hero ===== */
.hero { padding: 5rem 0 3rem; text-align: center; }
.hero .lede { margin: 1rem auto 0; }
.hero__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-top: 2rem; }

/* ===== Buttons ===== */
.btn { font-family: var(--font-display); font-weight: 600; font-size: 0.9rem; letter-spacing: 0.03em;
  padding: 0.8rem 1.5rem; border-radius: 10px; cursor: pointer; border: 1px solid transparent;
  display: inline-flex; align-items: center; gap: 0.5em; transition: transform 0.2s ease, box-shadow 0.2s ease; }
.btn--primary { background: linear-gradient(135deg, var(--teal-500), var(--cyan-400)); color: #06141a; }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(20,184,166,0.3); color: #06141a; }
.btn--ghost { background: transparent; border-color: var(--border-glow); color: var(--cyan-400); }
.btn--ghost:hover { background: rgba(34,211,238,0.07); transform: translateY(-2px); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ===== Glass card ===== */
.card { background: var(--bg-card); border: 1px solid var(--border-subtle); border-radius: 14px;
  padding: 1.5rem; backdrop-filter: blur(8px); transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease; }
.card:hover { border-color: var(--border-glow); box-shadow: 0 0 0 1px var(--border-glow), 0 12px 40px rgba(6,182,212,0.08); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; }

/* ===== Placeholder banner ===== */
.placeholder-banner { display: flex; gap: 0.75rem; align-items: flex-start; margin-bottom: 1.5rem;
  padding: 0.9rem 1.1rem; border-radius: 12px; border: 1px solid rgba(251,191,36,0.35);
  background: linear-gradient(135deg, rgba(251,191,36,0.08), rgba(251,191,36,0.02)); color: var(--text-secondary); }
.placeholder-banner strong { color: var(--gold-400); font-family: var(--font-display); letter-spacing: 0.03em; }
.placeholder-banner .pulse { width: 9px; height: 9px; border-radius: 50%; background: var(--gold-400);
  margin-top: 0.5rem; flex-shrink: 0; animation: point-pulse 2.2s ease-in-out infinite; }
@keyframes point-pulse { 0%,100% { opacity: 0.5; transform: scale(1); } 50% { opacity: 1; transform: scale(1.35); } }

/* ===== Leaderboard controls ===== */
.lb-toolbar { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; margin-bottom: 1.25rem; }
.lb-filters { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.chip { font-size: 0.78rem; font-family: var(--font-display); letter-spacing: 0.03em; padding: 0.35rem 0.7rem;
  border-radius: 999px; border: 1px solid var(--border-subtle); background: var(--bg-secondary);
  color: var(--text-secondary); cursor: pointer; transition: 0.2s; }
.chip:hover { border-color: var(--border-glow); color: var(--cyan-400); }
.chip.is-active { background: rgba(34,211,238,0.12); border-color: var(--border-glow); color: var(--cyan-400); }
.chip-group { display: inline-flex; gap: 0.4rem; align-items: center; }
.chip-group__label { font-size: 0.74rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.12em; }

/* ===== Leaderboard table (CSS grid) ===== */
.lb { border: 1px solid var(--border-subtle); border-radius: 14px; overflow: hidden; background: var(--bg-card); backdrop-filter: blur(8px); }
.lb__head, .lb__row { display: grid;
  grid-template-columns: 56px minmax(180px, 2.2fr) 96px 70px 1.4fr 1.2fr 130px 40px; align-items: center; }
.lb__head { background: var(--bg-secondary); border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-display); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-muted); }
.lb__head > div, .lb__row > div { padding: 0.85rem 0.75rem; }
.lb__head .sortable { cursor: pointer; user-select: none; }
.lb__head .sortable:hover { color: var(--cyan-400); }
.lb__head .sort-ind { color: var(--cyan-400); }
.lb__row { border-bottom: 1px solid var(--border-subtle); transition: background 0.2s ease; }
.lb__row:last-child { border-bottom: none; }
.lb__row:hover { background: rgba(56,189,248,0.03); }
.lb__row.is-placeholder { opacity: 0.78; }
.lb__rank { font-family: var(--font-display); font-weight: 700; color: var(--text-muted); }
.lb__rank--1 { color: var(--gold-400); }
.lb__model-name { color: var(--text-primary); font-weight: 600; }
.lb__model-sub { font-size: 0.76rem; color: var(--text-muted); }
.tier-badge { font-size: 0.68rem; font-family: var(--font-display); letter-spacing: 0.04em; padding: 0.18rem 0.5rem;
  border-radius: 6px; border: 1px solid var(--border-subtle); color: var(--text-secondary); white-space: nowrap; }
.tier-badge--grey_box { color: var(--teal-400); border-color: rgba(45,212,191,0.3); }
.tier-badge--black_box { color: var(--blue-500); border-color: rgba(59,130,246,0.3); }
.ver-pill { font-size: 0.72rem; color: var(--text-secondary); font-family: var(--font-display); }
.lb__caret { cursor: pointer; color: var(--text-muted); text-align: center; transition: 0.2s; }
.lb__caret:hover { color: var(--cyan-400); }
.lb__row.is-expanded .lb__caret { transform: rotate(180deg); color: var(--cyan-400); }

/* ===== Score badge ===== */
.score-badge { display: inline-flex; align-items: center; gap: 0.5rem; }
.score-badge__num { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; min-width: 3.2ch; }
.score-badge__bar { width: 56px; height: 8px; border-radius: 4px; background: rgba(255,255,255,0.06); overflow: hidden; position: relative; }
.score-badge__fill { height: 100%; border-radius: 4px; transition: width 0.9s cubic-bezier(0.16,1,0.3,1); }
.score-badge--capped { position: relative; }
.score-badge--capped .score-badge__num { color: var(--gold-400); }
.score-badge--capped::after { content: ''; position: absolute; inset: -4px -6px; border: 1px solid var(--gold-400);
  border-radius: 8px; opacity: 0.4; pointer-events: none; }
.score-badge--flagged .score-badge__num { color: var(--danger); }
.deception-flag { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.68rem; font-family: var(--font-display);
  letter-spacing: 0.03em; color: var(--danger); border: 1px solid rgba(248,113,113,0.4); border-radius: 6px;
  padding: 0.12rem 0.4rem; margin-left: 0.4rem; box-shadow: 0 0 12px var(--danger-glow); }

/* ===== CI bar ===== */
.ci { display: flex; flex-direction: column; gap: 0.25rem; }
.ci__label { font-size: 0.74rem; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.ci__track { position: relative; height: 4px; border-radius: 2px; background: rgba(56,189,248,0.1); }
.ci__span { position: absolute; height: 100%; border-radius: 2px; background: linear-gradient(90deg, var(--cyan-600), var(--cyan-400)); }
.ci__point { position: absolute; top: -3px; width: 3px; height: 10px; border-radius: 1px; background: var(--gold-400); }

/* ===== Construct detail (expandable) ===== */
.lb__detail { grid-column: 1 / -1; padding: 0 0.75rem; max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease; background: rgba(8,8,13,0.5); }
.lb__row.is-expanded + .lb__detail { max-height: 620px; padding: 1.25rem 0.75rem 1.5rem; }
.constructs { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.6rem 2rem; }
.construct-bar { }
.construct-bar__top { display: flex; justify-content: space-between; font-size: 0.8rem; margin-bottom: 0.25rem; }
.construct-bar__name { font-family: var(--font-display); font-size: 0.74rem; letter-spacing: 0.03em; color: var(--text-secondary); }
.construct-bar__val { font-variant-numeric: tabular-nums; color: var(--text-primary); }
.construct-bar__track { height: 7px; border-radius: 4px; background: rgba(255,255,255,0.05); overflow: hidden; }
.construct-bar__fill { height: 100%; border-radius: 4px; width: 0; transition: width 0.9s cubic-bezier(0.16,1,0.3,1); }
.construct-bar__meta { font-size: 0.7rem; color: var(--text-muted); margin-top: 0.2rem; }
.detail-meta { display: flex; flex-wrap: wrap; gap: 1.25rem; margin-top: 1.25rem; font-size: 0.78rem; color: var(--text-muted); }
.detail-meta b { color: var(--text-secondary); font-weight: 500; }

/* ===== Battery composite meter (signature element) ===== */
.battery { display: inline-flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.battery__shell { display: flex; gap: 3px; padding: 6px; border: 1px solid var(--border-glow); border-radius: 8px;
  background: rgba(8,8,13,0.6); }
.battery__seg { width: 12px; height: 30px; border-radius: 2px; background: rgba(255,255,255,0.05); position: relative; overflow: hidden; }
.battery__seg.is-lit .battery__seg-fill { position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--gold-400), var(--gold-600));
  animation: seg-ignite 0.6s ease forwards, segment-glow var(--battery-cycle) ease-in-out infinite; }
@keyframes seg-ignite { from { opacity: 0; transform: scaleY(0.2); transform-origin: bottom; } to { opacity: 1; transform: scaleY(1); } }
@keyframes segment-glow {
  0%, 100% { box-shadow: 0 0 6px rgba(251,191,36,0.25); }
  50% { box-shadow: 0 0 14px rgba(251,191,36,0.5), 0 0 24px rgba(251,191,36,0.2); }
}
.battery__seg-fill { opacity: 0; }
.battery__readout { display: flex; flex-direction: column; }
.battery__score { font-family: var(--font-display); font-weight: 800; font-size: 2.6rem; line-height: 1; color: var(--gold-400); }
.battery__caption { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.3rem; }
.spotlight { display: flex; gap: 1.5rem; align-items: center; flex-wrap: wrap; padding: 1.5rem; margin-bottom: 1.5rem; }
.spotlight__label { font-family: var(--font-display); font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--cyan-500); }
.spotlight__model { font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; color: var(--text-primary); }

/* ===== Forms ===== */
.form { display: flex; flex-direction: column; gap: 1.1rem; max-width: 560px; }
.form__field { display: flex; flex-direction: column; gap: 0.4rem; }
.form__label { font-size: 0.82rem; color: var(--text-secondary); font-weight: 500; }
.form__label .req { color: var(--cyan-400); }
.form input, .form select, .form textarea {
  font-family: var(--font-body); font-size: 0.95rem; color: var(--text-primary);
  background: var(--bg-secondary); border: 1px solid var(--border-subtle); border-radius: 9px; padding: 0.7rem 0.85rem; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--border-glow); box-shadow: 0 0 0 3px rgba(34,211,238,0.08); }
.form textarea { min-height: 110px; resize: vertical; }
.form__status { display: none; padding: 0.75rem 1rem; border-radius: 9px; font-size: 0.9rem; }
.form__status--success { display: block; background: rgba(45,212,191,0.1); border: 1px solid rgba(45,212,191,0.3); color: var(--teal-400); }
.form__status--error { display: block; background: rgba(248,113,113,0.08); border: 1px solid rgba(248,113,113,0.3); color: var(--danger); }
.form__status--info { display: block; background: rgba(59,130,246,0.08); border: 1px solid rgba(59,130,246,0.3); color: var(--blue-500); }

/* ===== Gated banner ===== */
.gated { text-align: center; padding: 2.5rem; border: 1px dashed var(--border-glow); border-radius: 14px; background: var(--bg-card); }
.gated h3 { color: var(--cyan-400); }

/* ===== Neutrality reminder ===== */
.neutrality { font-size: 0.85rem; color: var(--text-muted); border-left: 2px solid var(--border-glow); padding-left: 0.9rem; margin: 0.5rem 0 1.5rem; }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border-subtle); margin-top: 3rem; padding: 3rem 0 2.5rem; }
.footer__grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 2rem; }
.footer__mission { color: var(--text-secondary); max-width: 42ch; font-size: 0.9rem; }
.footer__brand { font-family: var(--font-display); font-weight: 800; letter-spacing: 0.08em; margin-bottom: 0.6rem; }
.footer h4 { font-family: var(--font-display); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 0.7rem; }
.footer__links { display: flex; flex-direction: column; gap: 0.4rem; }
.footer__links a { color: var(--text-secondary); font-size: 0.88rem; }
.footer__links a:hover { color: var(--cyan-400); }
.footer__legal { margin-top: 2rem; font-size: 0.78rem; color: var(--text-muted); }
@media (max-width: 720px) { .footer__grid { grid-template-columns: 1fr; } }

/* ===== Stat / metric blocks ===== */
.stat-row { display: flex; gap: 2.5rem; flex-wrap: wrap; margin: 1.5rem 0; }
.stat__num { font-family: var(--font-display); font-weight: 800; font-size: 2rem; }
.stat__label { font-size: 0.82rem; color: var(--text-muted); }

/* ===== Responsive leaderboard ===== */
@media (max-width: 860px) {
  .lb__head { display: none; }
  .lb__row { grid-template-columns: 40px 1fr auto 32px; grid-auto-rows: auto; gap: 0.25rem 0.5rem; padding: 0.5rem 0; }
  .lb__row > div { padding: 0.3rem 0.6rem; }
  .lb__row .col-tier, .lb__row .col-ver, .lb__row .col-ci { grid-column: 2 / -1; }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001s !important; animation-iteration-count: 1 !important; transition-duration: 0.001s !important; }
  .bg-gradient, .bg-grid, .bg-orb { animation: none; }
  .battery__seg.is-lit .battery__seg-fill { opacity: 1; transform: none; box-shadow: 0 0 8px rgba(251,191,36,0.3); }
}
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 100; background: var(--bg-card); padding: 0.5rem 1rem; border-radius: 8px; }