@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&family=Sora:wght@400;600;700;800&display=swap');

:root {
  --bg:        #080c14;
  --bg2:       #0d1420;
  --bg3:       #111927;
  --card:      #131d2e;
  --border:    #1e2d42;
  --border2:   #243347;
  --accent:    #3b82f6;
  --accent2:   #6366f1;
  --teal:      #14b8a6;
  --amber:     #f59e0b;
  --rose:      #f43f5e;
  --green:     #22c55e;
  --text:      #e2e8f0;
  --muted:     #64748b;
  --dim:       #334155;
  --mono:      'JetBrains Mono', monospace;
  --sans:      'Inter', sans-serif;
  --display:   'Sora', sans-serif;
  --radius:    12px;
  --radius-sm: 8px;
  --glow:      0 0 24px rgba(59,130,246,.15);
  --glow-teal: 0 0 24px rgba(20,184,166,.15);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: var(--sans); font-size: 15px; line-height: 1.65; min-height: 100vh; }

/* ── Typography ── */
h1,h2,h3,h4 { font-family: var(--display); font-weight: 700; letter-spacing: -.02em; line-height: 1.2; }
h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }
p { color: var(--muted); }
code, pre { font-family: var(--mono); }
em { font-style: italic; }
strong { font-weight: 600; }

/* ── Layout ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px,1fr)); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr)); gap: 16px; }

/* ── Nav ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8,12,20,.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; padding: 0 24px; max-width: 1200px; margin: 0 auto;
  gap: 16px;
}
.logo {
  font-family: var(--display); font-size: 1.15rem; font-weight: 800;
  color: var(--text); text-decoration: none; display: flex; align-items: center; gap: 8px;
  flex-shrink: 0;
}
.logo-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); display: inline-block; animation: pulse-dot 3s infinite; }
@keyframes pulse-dot { 0%,100%{box-shadow:0 0 0 0 rgba(59,130,246,.4)} 50%{box-shadow:0 0 0 5px rgba(59,130,246,0)} }
.nav-links { display: flex; gap: 2px; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); text-decoration: none; font-size: 13px; font-weight: 500;
  padding: 6px 10px; border-radius: var(--radius-sm); transition: color .15s, background .15s;
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--bg3); }
.nav-badge {
  font-size: 11px; font-weight: 600; color: var(--accent);
  background: rgba(59,130,246,.1); padding: 3px 10px; border-radius: 20px;
  border: 1px solid rgba(59,130,246,.2); white-space: nowrap; flex-shrink: 0;
}

/* ── Hero ── */
.hero { padding: 88px 0 72px; position: relative; overflow: hidden; }
.hero-glow {
  position: absolute; top: -120px; left: 50%; transform: translateX(-50%);
  width: 700px; height: 700px; border-radius: 50%;
  background: radial-gradient(circle, rgba(59,130,246,.1) 0%, transparent 70%);
  pointer-events: none;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 7px; font-size: 11.5px;
  font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
  color: var(--accent); background: rgba(59,130,246,.08);
  border: 1px solid rgba(59,130,246,.2); padding: 5px 14px; border-radius: 20px;
  margin-bottom: 22px;
}
.hero-tag::before { content:''; width:6px; height:6px; border-radius:50%; background:var(--accent); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }
.hero h1 { margin-bottom: 16px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p { font-size: 1.05rem; max-width: 540px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; text-decoration: none; cursor: pointer;
  border: none; transition: all .15s; font-family: var(--sans); white-space: nowrap;
  user-select: none; -webkit-user-select: none;
}
.btn:disabled { opacity: .5; cursor: not-allowed; pointer-events: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #2563eb; box-shadow: 0 0 18px rgba(59,130,246,.35); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border2); }
.btn-ghost:hover { background: var(--bg3); border-color: var(--dim); }
.btn-sm { padding: 6px 13px; font-size: 12.5px; }
.btn i { font-size: 16px; }

/* ── Cards ── */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
  transition: border-color .2s, box-shadow .2s;
}
.card:hover { border-color: var(--border2); }

.topic-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  text-decoration: none; display: block;
  transition: all .2s; position: relative; overflow: hidden;
}
.topic-card::before {
  content:''; position:absolute; inset:0; opacity:0;
  background: linear-gradient(135deg, rgba(59,130,246,.05), transparent);
  transition: opacity .2s;
}
.topic-card:hover { border-color: rgba(59,130,246,.4); box-shadow: var(--glow); transform: translateY(-2px); }
.topic-card:hover::before { opacity: 1; }

.topic-num { font-family: var(--mono); font-size: 11px; font-weight: 500; color: var(--muted); margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.topic-badge { font-size: 10px; padding: 2px 7px; border-radius: 8px; font-weight: 600; font-family: var(--sans); }
.badge-locked { background: rgba(99,102,241,.12); color: #818cf8; border: 1px solid rgba(99,102,241,.2); }
.badge-flex   { background: rgba(20,184,166,.1);  color: var(--teal);  border: 1px solid rgba(20,184,166,.2); }

.topic-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 6px; font-family: var(--display); }
.topic-desc  { font-size: 13px; color: var(--muted); line-height: 1.5; }
.demo-tag {
  display: inline-flex; align-items: center; gap: 5px; font-size: 11px; font-weight: 600;
  color: var(--amber); background: rgba(245,158,11,.08); border: 1px solid rgba(245,158,11,.18);
  padding: 3px 9px; border-radius: 8px; margin-top: 12px;
}

/* ── Sections ── */
.section { padding: 72px 0; }
.section-label {
  font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.section-title { margin-bottom: 10px; }
.section-sub { font-size: 1rem; margin-bottom: 44px; }

/* ── Stats ── */
.stats-bar {
  display: flex; flex-wrap: wrap;
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; margin-bottom: 64px;
}
.stat-item { flex: 1; min-width: 130px; padding: 20px 22px; border-right: 1px solid var(--border); }
.stat-item:last-child { border-right: none; }
.stat-val { font-family: var(--display); font-size: 1.75rem; font-weight: 800; color: var(--text); line-height: 1; }
.stat-val span { color: var(--accent); }
.stat-lbl { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ── Feature pills ── */
.feature-strip { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 44px; }
.feature-pill {
  display: flex; align-items: center; gap: 7px; padding: 7px 14px;
  border-radius: 20px; background: var(--bg3); border: 1px solid var(--border);
  font-size: 13px; font-weight: 500; color: var(--text);
}
.feature-pill i { font-size: 16px; color: var(--accent); }

/* ── Model status ── */
.model-status {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  border-radius: var(--radius-sm); background: var(--bg3); border: 1px solid var(--border);
  font-size: 13px; font-family: var(--mono);
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.status-dot.idle    { background: var(--muted); }
.status-dot.loading { background: var(--amber); animation: pulse 1s infinite; }
.status-dot.ready   { background: var(--green); }
.status-dot.error   { background: var(--rose); }

.progress-bar-wrap { background: var(--bg3); border-radius: 4px; height: 4px; overflow: hidden; }
.progress-bar-fill { height: 100%; background: linear-gradient(90deg,var(--accent),var(--accent2)); transition: width .3s; border-radius: 4px; }

/* ── Inputs ── */
.input, .textarea, select.input {
  background: var(--bg3); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 10px 14px; color: var(--text); font-size: 14px; font-family: var(--sans);
  width: 100%; transition: border-color .15s; outline: none; resize: vertical;
  appearance: none; -webkit-appearance: none;
}
.input:focus, .textarea:focus, select.input:focus { border-color: var(--accent); }
.textarea { min-height: 80px; }
select.input { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; cursor: pointer; }
select.input option { background: var(--bg3); color: var(--text); }
.label { font-size: 11.5px; font-weight: 600; color: var(--muted); margin-bottom: 6px; display: block; text-transform: uppercase; letter-spacing: .04em; }

/* ── Chips ── */
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 10px; font-size: 12px; font-weight: 600;
}
.chip-blue  { background: rgba(59,130,246,.1);  color: var(--accent); }
.chip-green { background: rgba(34,197,94,.08);  color: var(--green); }
.chip-amber { background: rgba(245,158,11,.1);  color: var(--amber); }
.chip-rose  { background: rgba(244,63,94,.1);   color: var(--rose); }
.chip-teal  { background: rgba(20,184,166,.1);  color: var(--teal); }

/* ── Result box ── */
.result-box {
  background: var(--bg3); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px; font-size: 13px; min-height: 48px; color: var(--text);
  line-height: 1.6; overflow: auto; max-height: 360px;
}
.result-placeholder { color: var(--muted); font-style: italic; font-family: var(--sans); }

/* ── Terminal / code ── */
.terminal {
  background: #060a10; border-radius: var(--radius-sm); padding: 16px;
  font-family: var(--mono); font-size: 12.5px; color: #a8d8a8; line-height: 1.75;
  overflow-x: auto; border: 1px solid var(--border);
}
.terminal .cm { color: var(--muted); }
.terminal .kw { color: #93c5fd; }
.terminal .st { color: #86efac; }
.terminal .fn { color: #f9a8d4; }

/* ── Footer ── */
.footer { border-top: 1px solid var(--border); padding: 28px 0; text-align: center; }
.footer p { font-size: 13px; color: var(--muted); }
.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--dim); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 56px 0 40px; }
  .stats-bar { flex-direction: column; }
  .stat-item { border-right: none; border-bottom: 1px solid var(--border); }
  .stat-item:last-child { border-bottom: none; }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .container { padding: 0 16px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }