:root {
  --bg: #08101c;
  --bg-soft: #0d1726;
  --card: rgba(15, 27, 43, 0.78);
  --card-strong: #101d2e;
  --line: rgba(182, 203, 226, 0.14);
  --line-strong: rgba(182, 203, 226, 0.24);
  --text: #f2f6fb;
  --muted: #9aaabe;
  --accent: #79f2c6;
  --accent-2: #79b9ff;
  --accent-dim: rgba(121, 242, 198, 0.13);
  --shadow: 0 32px 80px rgba(0, 0, 0, 0.28);
  --radius: 24px;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(circle at 50% -15%, rgba(67, 118, 168, 0.18), transparent 32rem),
    linear-gradient(180deg, #07101c 0%, #08101b 58%, #09121e 100%);
  min-height: 100vh;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.2;
  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: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 70%);
}

button, input, textarea, select { font: inherit; }
a { color: inherit; text-decoration: none; }
button { color: inherit; }
.shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }

.ambient { position: fixed; pointer-events: none; filter: blur(80px); border-radius: 999px; opacity: .14; }
.ambient-a { width: 340px; height: 340px; background: var(--accent); right: -140px; top: 280px; }
.ambient-b { width: 420px; height: 420px; background: var(--accent-2); left: -240px; top: 900px; }

.site-header { height: 82px; display: flex; align-items: center; justify-content: space-between; position: relative; z-index: 10; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 720; letter-spacing: -0.04em; font-size: 20px; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 9px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #04101b; font-weight: 900; font-size: 15px; box-shadow: 0 0 30px rgba(121,242,198,.18); }
.brand-dot { color: var(--accent); }
.nav { display: flex; gap: 30px; color: var(--muted); font-size: 14px; }
.nav a:hover { color: var(--text); }
.nav-cta { font-size: 13px; font-weight: 700; padding: 10px 14px; border: 1px solid var(--line-strong); border-radius: 999px; background: rgba(255,255,255,.025); }

.hero { padding: 116px 0 88px; text-align: center; position: relative; }
.eyebrow, .kicker { font-family: var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); font-size: 11px; font-weight: 700; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; padding: 8px 12px; border: 1px solid rgba(121,242,198,.18); border-radius: 999px; background: rgba(121,242,198,.05); }
.pulse { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; box-shadow: 0 0 0 5px rgba(121,242,198,.08); }
.hero h1 { font-size: clamp(58px, 9vw, 112px); line-height: .92; margin: 34px auto 28px; letter-spacing: -0.075em; max-width: 1000px; font-weight: 760; }
.hero h1 span { background: linear-gradient(95deg, #f6fbff 10%, #84f0ca 52%, #83baff 90%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-copy { max-width: 720px; margin: 0 auto; color: #aebdd0; font-size: clamp(17px, 2vw, 20px); line-height: 1.65; }
.hero-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 0 19px; border-radius: 12px; border: 1px solid transparent; font-weight: 720; font-size: 14px; cursor: pointer; transition: .2s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { background: var(--accent); color: #07131c; box-shadow: 0 12px 32px rgba(121,242,198,.14); }
.button.secondary { border-color: var(--line-strong); background: rgba(255,255,255,.03); color: #d7e0eb; }
.hero-manifesto { margin-top: 62px; color: #7f90a5; font-size: 13px; letter-spacing: .03em; }
.hero-manifesto strong { color: #dfe9f4; font-weight: 650; }

.proof-strip { display: flex; align-items: center; justify-content: center; gap: 20px; padding: 17px 24px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: #72849a; text-transform: uppercase; letter-spacing: .11em; font-size: 9px; font-family: var(--mono); white-space: nowrap; overflow: hidden; }
.proof-strip i { width: 3px; height: 3px; background: #52657a; border-radius: 50%; }

.section { padding: 112px 0 20px; scroll-margin-top: 40px; }
.section-heading { margin-bottom: 36px; }
.section-heading h2 { font-size: clamp(36px, 5vw, 56px); letter-spacing: -0.055em; line-height: 1.02; margin: 14px 0 0; max-width: 680px; }
.split-heading { display: grid; grid-template-columns: 1.2fr .8fr; gap: 60px; align-items: end; }
.split-heading > p { color: var(--muted); line-height: 1.7; margin: 0 0 4px; max-width: 500px; }

.ask-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; }
.chat-card, .prompt-panel, .evaluator-card, .model-card, .closing-card { border: 1px solid var(--line); background: linear-gradient(180deg, rgba(18,31,49,.82), rgba(11,21,35,.84)); box-shadow: var(--shadow); }
.chat-card { border-radius: var(--radius); overflow: hidden; min-height: 620px; display: flex; flex-direction: column; }
.chat-topbar { display: flex; align-items: center; padding: 17px 18px; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.012); }
.avatar { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; background: var(--accent-dim); color: var(--accent); font-weight: 800; margin-right: 11px; }
.chat-topbar strong { display: block; font-size: 13px; }
.chat-topbar span { display: block; color: #71849a; font-size: 10px; margin-top: 3px; }
.status { margin-left: auto; color: #769087; font-family: var(--mono); font-size: 9px; display: flex; align-items: center; gap: 7px; text-transform: uppercase; letter-spacing: .08em; }
.status span { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; margin: 0; }
.chat-messages { flex: 1; padding: 28px 26px; overflow: auto; max-height: 460px; }
.message { max-width: 84%; margin-bottom: 20px; line-height: 1.65; font-size: 14px; }
.message p { margin: 6px 0; white-space: pre-wrap; }
.message strong { color: #edf5fb; }
.message-label { font-family: var(--mono); color: var(--accent); font-size: 9px; letter-spacing: .12em; margin-bottom: 5px; }
.message.user { margin-left: auto; background: rgba(255,255,255,.05); border: 1px solid var(--line); border-radius: 16px 16px 4px 16px; padding: 12px 14px; }
.message.user .message-label { color: #8294aa; }
.message.assistant { color: #b9c7d6; }
.message.loading p { color: #6f8298; }
.message-sources { margin-top: 10px; display: flex; gap: 6px; flex-wrap: wrap; }
.message-sources span { border: 1px solid var(--line); background: rgba(255,255,255,.02); color: #7890a6; padding: 4px 7px; border-radius: 7px; font-size: 9px; font-family: var(--mono); }
.chat-input-wrap { margin: 0 18px 13px; border: 1px solid var(--line-strong); background: #0a1421; border-radius: 15px; display: flex; align-items: flex-end; padding: 8px; transition: .2s ease; }
.chat-input-wrap:focus-within { border-color: rgba(121,242,198,.45); box-shadow: 0 0 0 3px rgba(121,242,198,.06); }
.chat-input-wrap textarea { flex: 1; resize: none; border: 0; outline: 0; background: transparent; color: var(--text); min-height: 44px; max-height: 130px; padding: 10px; line-height: 1.45; }
.chat-input-wrap textarea::placeholder { color: #53667d; }
.send-button { border: 0; width: 38px; height: 38px; border-radius: 11px; background: var(--accent); color: #07131c; font-weight: 900; cursor: pointer; }
.disclaimer { padding: 0 20px 15px; color: #596b80; font-size: 9px; line-height: 1.4; }
.prompt-panel { border-radius: var(--radius); padding: 22px; height: fit-content; }
.panel-label { font-family: var(--mono); color: #667c93; font-size: 9px; letter-spacing: .14em; margin-bottom: 12px; }
.prompt-chip { width: 100%; text-align: left; border: 1px solid var(--line); background: rgba(255,255,255,.02); border-radius: 13px; padding: 13px; color: #aebdd0; margin-bottom: 9px; cursor: pointer; line-height: 1.4; font-size: 12px; transition: .2s ease; }
.prompt-chip:hover { border-color: rgba(121,242,198,.3); color: #eef6fb; transform: translateX(2px); }
.prompt-note { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 18px; }
.prompt-note span { color: var(--accent); font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .12em; }
.prompt-note p { color: #778ba2; font-size: 12px; line-height: 1.5; }

.evaluator-card { border-radius: var(--radius); overflow: hidden; display: grid; grid-template-columns: 1.15fr .85fr; }
.evaluator-form { padding: 30px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; border-right: 1px solid var(--line); }
.field { display: flex; flex-direction: column; gap: 8px; }
.field-wide { grid-column: 1 / -1; }
.field > span { color: #7f91a8; font-size: 11px; font-family: var(--mono); }
.field textarea, .field select { width: 100%; border: 1px solid var(--line); background: #0a1421; color: #dce7f2; border-radius: 11px; padding: 12px; outline: none; }
.field textarea:focus, .field select:focus { border-color: rgba(121,242,198,.4); }
.evaluation-result { padding: 32px; display: flex; align-items: center; justify-content: center; background: radial-gradient(circle at 50% 30%, rgba(121,242,198,.07), transparent 55%); }
.result-placeholder { text-align: center; max-width: 260px; }
.score-orbit { width: 96px; height: 96px; border: 1px solid rgba(121,242,198,.28); border-radius: 50%; display: grid; place-items: center; margin: 0 auto 17px; box-shadow: inset 0 0 30px rgba(121,242,198,.05), 0 0 40px rgba(121,242,198,.05); }
.score-orbit span { font-family: var(--mono); font-size: 31px; color: var(--accent); }
.result-placeholder h3 { margin: 0; font-size: 18px; }
.result-placeholder p { color: var(--muted); font-size: 12px; line-height: 1.6; }
.result-live { width: 100%; }
.result-live .result-top { display: flex; gap: 18px; align-items: center; margin-bottom: 24px; }
.result-live .score-orbit { margin: 0; flex: 0 0 auto; }
.result-live h3 { margin: 0 0 5px; font-size: 22px; }
.result-badge { color: var(--accent); font-family: var(--mono); font-size: 10px; text-transform: uppercase; letter-spacing: .08em; }
.metric { margin: 12px 0; }
.metric-head { display: flex; justify-content: space-between; color: #8295ab; font-size: 10px; font-family: var(--mono); margin-bottom: 5px; }
.metric-bar { height: 5px; background: rgba(255,255,255,.06); border-radius: 99px; overflow: hidden; }
.metric-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent-2), var(--accent)); border-radius: 99px; }
.result-callout { border-top: 1px solid var(--line); margin-top: 20px; padding-top: 18px; }
.result-callout span { color: #71879c; font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .1em; }
.result-callout p { color: #becbd8; font-size: 12px; line-height: 1.55; margin: 6px 0 0; }

.model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.model-card { border-radius: 18px; padding: 24px; min-height: 235px; position: relative; overflow: hidden; transition: .2s ease; }
.model-card:hover { transform: translateY(-4px); border-color: rgba(121,242,198,.26); }
.model-card.featured { background: linear-gradient(145deg, rgba(121,242,198,.13), rgba(16,29,46,.92) 60%); }
.model-index { color: #52687e; font-family: var(--mono); font-size: 9px; }
.model-icon { font-family: var(--mono); font-size: 30px; color: var(--accent); margin: 24px 0 17px; }
.model-card h3 { margin: 0 0 10px; font-size: 18px; }
.model-card p { color: #899db2; line-height: 1.6; font-size: 12px; margin: 0; }
.model-equation { color: #c9d6e3 !important; font-family: var(--mono); margin-bottom: 9px !important; }
.model-equation b { color: var(--accent); }

.pov-list { border-top: 1px solid var(--line); }
.pov-list details { border-bottom: 1px solid var(--line); }
.pov-list summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 25px 0; font-size: clamp(20px, 3vw, 31px); letter-spacing: -0.03em; }
.pov-list summary::-webkit-details-marker { display: none; }
.pov-list summary b { color: #4f6479; font-family: var(--mono); font-size: 10px; font-weight: 500; }
.pov-list details p { max-width: 780px; margin: -5px 0 25px; color: #8fa3b8; line-height: 1.75; }
.pov-list details[open] summary span { color: var(--accent); }

.closing { padding-bottom: 100px; }
.closing-card { border-radius: 30px; padding: clamp(40px, 7vw, 80px); text-align: center; background: radial-gradient(circle at 50% 0%, rgba(121,242,198,.12), transparent 35%), linear-gradient(180deg, rgba(16,30,48,.9), rgba(9,18,30,.92)); }
.closing-card h2 { font-size: clamp(42px, 6vw, 70px); line-height: 1; letter-spacing: -0.06em; margin: 18px 0; }
.closing-card h2 span { color: var(--accent); }
.closing-card p { max-width: 650px; margin: 0 auto 28px; color: var(--muted); line-height: 1.7; }
.footer { border-top: 1px solid var(--line); min-height: 100px; display: flex; align-items: center; justify-content: space-between; gap: 30px; color: #586b80; font-size: 10px; }
.footer .brand { color: var(--text); font-size: 15px; }
.footer .brand-mark { width: 25px; height: 25px; font-size: 12px; border-radius: 7px; }

@media (max-width: 900px) {
  .nav { display: none; }
  .hero { padding-top: 88px; }
  .split-heading { grid-template-columns: 1fr; gap: 18px; }
  .ask-grid { grid-template-columns: 1fr; }
  .prompt-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .prompt-panel .panel-label, .prompt-panel .prompt-note { grid-column: 1 / -1; }
  .prompt-chip { margin-bottom: 0; }
  .evaluator-card { grid-template-columns: 1fr; }
  .evaluator-form { border-right: 0; border-bottom: 1px solid var(--line); }
  .model-grid { grid-template-columns: 1fr 1fr; }
  .proof-strip { justify-content: flex-start; }
}

@media (max-width: 620px) {
  .shell { width: min(100% - 24px, 1180px); }
  .nav-cta { display: none; }
  .site-header { height: 68px; }
  .hero { padding: 66px 0 60px; }
  .hero h1 { font-size: clamp(52px, 18vw, 76px); }
  .section { padding-top: 82px; }
  .chat-card { min-height: 570px; }
  .chat-messages { padding: 22px 16px; }
  .message { max-width: 94%; }
  .prompt-panel { grid-template-columns: 1fr; }
  .prompt-panel .panel-label, .prompt-panel .prompt-note { grid-column: auto; }
  .evaluator-form { grid-template-columns: 1fr; padding: 20px; }
  .field-wide { grid-column: auto; }
  .model-grid { grid-template-columns: 1fr; }
  .footer { flex-direction: column; justify-content: center; padding: 28px 0; text-align: center; }
}