:root {
  --bg: #061120;
  --bg-2: #0a1930;
  --panel: #0d1c34;
  --panel-2: #102440;
  --text: #edf6ff;
  --muted: #a9bdd5;
  --line: #233c59;
  --cyan: #37c6ff;
  --blue: #5d8cff;
  --purple: #9465ff;
  --green: #45d3a1;
  --danger: #ff7a8b;
  --warning: #ffd27a;
  --shadow: 0 18px 60px rgba(0, 0, 0, .28);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 15% 10%, rgba(55, 198, 255, .10), transparent 28%),
    radial-gradient(circle at 80% 20%, rgba(148, 101, 255, .08), transparent 30%),
    var(--bg);
  color: var(--text);
  font: 16px/1.6 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: inherit; }
button, select, textarea { font: inherit; }
button { touch-action: manipulation; }
.skip-link { position: fixed; left: 1rem; top: -5rem; background: #fff; color: #000; padding: .7rem 1rem; border-radius: 10px; z-index: 1000; }
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 14px clamp(20px, 4vw, 54px);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  background: rgba(6, 17, 32, .9);
  backdrop-filter: blur(16px);
}
.brand { display: flex; align-items: center; gap: .75rem; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 14px; background: linear-gradient(135deg, var(--cyan), var(--purple)); font-weight: 900; }
.brand strong, .brand small { display: block; }
.brand small { font-size: .76rem; color: var(--muted); }
nav { display: flex; align-items: center; gap: 1.3rem; }
nav a { text-decoration: none; color: #c6d5e5; }
nav a:hover { color: #fff; }
.github-link { padding: .55rem .9rem; border: 1px solid var(--line); border-radius: 14px; }
.menu-button { display: none; background: transparent; color: var(--text); border: 1px solid var(--line); border-radius: 12px; padding: .55rem .8rem; }

.hero { min-height: 72vh; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr); gap: 4rem; align-items: center; padding: clamp(64px, 8vw, 120px) clamp(24px, 5vw, 80px); }
.hero h1 { font-size: clamp(3rem, 6vw, 6.2rem); line-height: .96; letter-spacing: -.055em; margin: .3rem 0 1.6rem; max-width: 900px; }
.hero h1 span { background: linear-gradient(90deg, var(--cyan), var(--blue), var(--purple)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { max-width: 760px; color: #c4d7eb; font-size: clamp(1.08rem, 1.4vw, 1.32rem); }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .75rem; font-weight: 800; color: #66d4ff; }
.hero-actions, .button-row, .response-actions, .trust-row { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: .7rem 1.15rem; border-radius: 14px; border: 1px solid transparent; font-weight: 800; text-decoration: none; cursor: pointer; }
.btn:disabled { opacity: .62; cursor: wait; }
.primary { background: linear-gradient(135deg, #22b8f5, #8058ff); color: white; }
.secondary, .ghost { background: #0f223a; border-color: var(--line); color: #fff; }
.trust-row { margin-top: 1rem; }
.trust-row span { font-size: .86rem; color: #bcd0e5; border: 1px solid var(--line); border-radius: 999px; padding: .36rem .65rem; }
.hero-visual { position: relative; min-height: 480px; }
.orb { position: absolute; inset: 8% 12%; border-radius: 50%; background: radial-gradient(circle at 30% 25%, #396eb9, transparent 36%), radial-gradient(circle at 70% 70%, #613ba5, transparent 40%), #14233f; box-shadow: 0 0 100px rgba(87, 102, 255, .23); }
.assistant-card { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: min(350px, 78%); padding: 2rem; border: 1px solid #325679; border-radius: 28px; background: rgba(12, 31, 57, .88); box-shadow: var(--shadow); text-align: center; }
.assistant-card strong, .assistant-card small { display: block; }
.assistant-card small { color: var(--muted); margin-top: .4rem; }
.bot-face { display: grid; place-items: center; margin: 0 auto 1.2rem; width: 92px; height: 92px; border: 1px solid var(--cyan); border-radius: 28px; font-size: 2.6rem; color: #67d7ff; }
.formula { position: absolute; padding: .45rem .7rem; border: 1px solid var(--line); border-radius: 12px; background: #09182a; color: #d7e7f8; font-weight: 700; }
.f1 { left: 0; top: 18%; }
.f2 { right: 0; top: 36%; }
.f3 { left: 12%; bottom: 13%; }

.assistant-section, .workflow, .evaluation, .about, .safety { padding: 80px clamp(24px, 5vw, 80px); }
.section-heading { max-width: 900px; margin-bottom: 2rem; }
.section-heading h2, .about h2, .safety h2 { font-size: clamp(2rem, 4vw, 3.8rem); line-height: 1.05; letter-spacing: -.035em; margin: .4rem 0 1rem; }
.section-heading p, .about p, .safety p { color: var(--muted); }
.centered { text-align: center; margin-inline: auto; }
.workspace { display: grid; grid-template-columns: minmax(320px, .9fr) minmax(420px, 1.1fr); gap: 1.2rem; }
.card { background: linear-gradient(180deg, rgba(16, 36, 64, .94), rgba(10, 26, 48, .94)); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.question-panel, .answer-panel { padding: 1.4rem; }
.question-panel label { display: block; font-weight: 800; margin: .6rem 0; }
.control-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; align-items: end; }
.control-grid label { margin: 0; }
.control-grid select { margin-top: .4rem; }
.scope-card { display: flex; flex-direction: column; justify-content: center; min-height: 78px; padding: .8rem 1rem; border: 1px solid #2a6d75; border-radius: 14px; background: rgba(31, 137, 145, .09); }
.scope-card span { color: var(--muted); font-size: .8rem; }
select, textarea { width: 100%; color: var(--text); background: #071526; border: 1px solid #294766; border-radius: 14px; padding: .85rem; outline: none; }
textarea { resize: vertical; min-height: 160px; }
select:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid #70d8ff; outline-offset: 3px; }
.field-help, .safety-note { font-size: .82rem; color: #9fb5ca; }
.quick-examples { display: flex; flex-wrap: wrap; gap: .55rem; margin: 1rem 0; }
.quick-examples button, .response-actions button { border: 1px solid var(--line); background: #0b2039; color: #dcecff; border-radius: 999px; padding: .48rem .75rem; cursor: pointer; }
.quick-examples button:hover, .response-actions button:hover { border-color: #4f79a7; background: #102947; }
.answer-header { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; border-bottom: 1px solid var(--line); padding-bottom: 1rem; }
.answer-header h3 { margin: .1rem 0; }
.status { border: 1px solid #2b765f; border-radius: 999px; padding: .32rem .6rem; color: #86efc4; background: #0a2a24; font-size: .78rem; }
.status[data-kind="busy"] { color: #d9ccff; border-color: #7355b7; background: #201640; }
.status[data-kind="error"] { color: #ffd9df; border-color: #7d3340; background: #32151d; }
.metric-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: .65rem; padding: 1rem 0 .2rem; }
.metric-strip div { padding: .7rem; border: 1px solid var(--line); border-radius: 12px; background: #08182c; }
.metric-strip span, .metric-strip strong { display: block; }
.metric-strip span { color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; }
.metric-strip strong { font-size: .86rem; }
.conversation { min-height: 420px; max-height: 650px; overflow: auto; padding: 1rem .15rem; scrollbar-color: #315272 transparent; }
.message { padding: 1rem; border-radius: 18px; margin: .8rem 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.message.user { margin-left: 10%; background: #132c4b; border: 1px solid #315477; }
.message.assistant { margin-right: 6%; background: #0a213b; border: 1px solid #244866; }
.message .meta { display: flex; justify-content: space-between; gap: 1rem; color: #91a8bf; font-size: .75rem; margin-bottom: .35rem; }
.message-body { line-height: 1.68; }
.empty-state { text-align: center; color: var(--muted); padding: 5rem 2rem; }
.empty-icon { font-size: 3rem; color: #65d7ff; }
.response-actions { border-top: 1px solid var(--line); padding-top: 1rem; }
.feedback-label { color: var(--muted); font-size: .85rem; }
.error-box { margin-top: 1rem; padding: .8rem 1rem; border-radius: 14px; border: 1px solid #7d3340; background: #32151d; color: #ffd9df; }
.fallback-link { display: inline-flex; margin-top: .8rem; color: #8ddfff; }

.workflow { background: linear-gradient(180deg, rgba(21, 43, 75, .25), transparent); }
.seven-steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(7, 1fr); gap: .7rem; }
.seven-steps li { min-height: 210px; padding: 1rem; border: 1px solid var(--line); border-radius: 20px; background: #0a1b31; }
.seven-steps span { color: #65d7ff; font-weight: 900; }
.seven-steps strong { display: block; font-size: 1.05rem; margin: .5rem 0; }
.seven-steps p { color: var(--muted); font-size: .87rem; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.feature-card { padding: 1.5rem; border: 1px solid var(--line); border-radius: 22px; background: #0a1b31; }
.feature-card > span { color: #66d4ff; font-weight: 900; }
.feature-card p { color: var(--muted); }
.safety { display: grid; grid-template-columns: 1.1fr .9fr; gap: 3rem; align-items: center; background: linear-gradient(135deg, rgba(55, 198, 255, .06), rgba(148, 101, 255, .05)); }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .7rem; }
.check-list li { padding: .8rem 1rem; border: 1px solid var(--line); border-radius: 14px; background: #0a1c31; }
.check-list li::before { content: "✓"; color: var(--green); font-weight: 900; margin-right: .7rem; }
.about { display: grid; grid-template-columns: 1fr .85fr; gap: 2rem; }
.roadmap { padding: 1.5rem; }
.roadmap ol { list-style: none; padding: 0; margin: 0; display: grid; gap: .65rem; }
.roadmap li { display: flex; justify-content: space-between; gap: 1rem; padding: .8rem; border: 1px solid var(--line); border-radius: 12px; color: var(--muted); }
.roadmap li.active { border-color: #735cf0; background: rgba(111, 87, 240, .12); color: #fff; }

footer { display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding: 28px clamp(24px, 5vw, 80px); border-top: 1px solid var(--line); color: var(--muted); }
footer strong, footer span { display: block; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-links a { color: #cfe5fa; }
.noscript { padding: 1rem; background: #4f1721; color: #fff; text-align: center; }

@media (max-width: 1120px) {
  .seven-steps { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 950px) {
  .hero, .workspace, .safety, .about { grid-template-columns: 1fr; }
  .hero { gap: 1rem; }
  .hero-visual { min-height: 350px; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .menu-button { display: block; }
  nav { display: none; position: absolute; right: 20px; top: 72px; flex-direction: column; align-items: stretch; background: #08182b; border: 1px solid var(--line); border-radius: 16px; padding: 1rem; min-width: 220px; }
  nav.open { display: flex; }
}
@media (max-width: 700px) {
  .seven-steps { grid-template-columns: 1fr 1fr; }
  .metric-strip { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .hero { padding-top: 72px; }
  .hero h1 { font-size: 3.3rem; }
  .feature-grid, .control-grid, .seven-steps { grid-template-columns: 1fr; }
  .question-panel, .answer-panel { padding: 1rem; }
  .message.user { margin-left: 3%; }
  .message.assistant { margin-right: 3%; }
  footer { flex-direction: column; align-items: flex-start; }
  .assistant-section, .workflow, .evaluation, .about, .safety { padding: 60px 20px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

.legal-page { min-height: 100vh; }
.legal-wrap { width: min(820px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0 100px; }
.legal-wrap h1 { font-size: clamp(2.6rem, 7vw, 5rem); line-height: 1; margin: .4rem 0 2rem; }
.legal-wrap h2 { margin-top: 2rem; }
.legal-wrap p { color: #c2d4e8; }

/* Day 5: UI integration and export controls */
.day5-badge { display:inline-flex; align-items:center; gap:.45rem; padding:.45rem .75rem; border:1px solid rgba(74,222,128,.35); border-radius:999px; background:rgba(22,163,74,.10); color:#86efac; font-size:.78rem; font-weight:700; }
.export-group { display:flex; flex-wrap:wrap; gap:.55rem; align-items:center; margin-left:auto; }
.export-group button { border:1px solid rgba(148,163,184,.28); background:rgba(15,23,42,.72); color:#dbeafe; border-radius:10px; padding:.58rem .75rem; cursor:pointer; }
.export-group button:hover, .export-group button:focus-visible { border-color:#38bdf8; }
.ui-status { margin-top:.75rem; font-size:.85rem; color:#94a3b8; }
@media (max-width: 720px) { .export-group { width:100%; margin-left:0; } .export-group button { flex:1 1 140px; } }