:root {
  --bg: #0b0f14;
  --bg-elevated: #121821;
  --bg-card: #161d29;
  --border: #232c3b;
  --text: #e6edf3;
  --text-dim: #93a2b8;
  --accent: #2dd4bf;
  --accent-dim: #0f766e;
  --accent-soft: rgba(45, 212, 191, 0.12);
  --danger: #f87171;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
nav.topbar {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(8px);
  z-index: 10;
}
nav.topbar .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: 1080px;
  margin: 0 auto;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand .dot { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 20px; }
.nav-links a.button-link {
  background: var(--accent);
  color: #06201d;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
}
.nav-links a.button-link:hover { text-decoration: none; opacity: 0.9; }
.nav-links a { color: var(--text-dim); font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); }

/* Hero */
.hero {
  padding: 96px 24px 64px;
  text-align: center;
}
.hero .kicker {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.hero h1 {
  font-size: 2.75rem;
  line-height: 1.15;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}
.hero h1 .accent { color: var(--accent); }
.hero p.lead {
  font-size: 1.2rem;
  color: var(--text-dim);
  max-width: 620px;
  margin: 0 auto 36px;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 9px;
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #06201d; }
.btn-primary:hover { text-decoration: none; opacity: 0.92; }
.btn-secondary { background: transparent; color: var(--text); border-color: var(--border); }
.btn-secondary:hover { text-decoration: none; border-color: var(--accent); }

/* Sections */
section { padding: 64px 24px; }
section h2 {
  font-size: 1.9rem;
  text-align: center;
  margin: 0 0 12px;
}
section p.section-lead {
  text-align: center;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 48px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
  max-width: 1080px;
  margin: 0 auto;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card h3 { margin: 0 0 10px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--text-dim); font-size: 0.93rem; }
.card .icon {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 8px;
  margin-bottom: 14px;
  font-weight: 700;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  max-width: 1080px;
  margin: 0 auto;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 24px 20px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}
.step::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  width: 28px; height: 28px;
  align-items: center; justify-content: center;
  background: var(--accent);
  color: #06201d;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 14px;
}
.step h4 { margin: 0 0 8px; }
.step p { margin: 0; color: var(--text-dim); font-size: 0.9rem; }

.example-box {
  max-width: 640px;
  margin: 36px auto 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}
.example-box .q { color: var(--text-dim); }
.example-box .a { color: var(--accent); margin-top: 6px; }

pre.code {
  background: #0a0e13;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  max-width: 720px;
  margin: 0 auto;
  color: #c9d6e3;
}
pre.code .cmt { color: var(--text-dim); }

.cta-footer {
  text-align: center;
  padding: 80px 24px;
  border-top: 1px solid var(--border);
}
.cta-footer h2 { margin-bottom: 24px; }

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* Auth forms */
.auth-wrap {
  min-height: calc(100vh - 130px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}
.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.auth-card h1 { font-size: 1.4rem; margin: 0 0 6px; }
.auth-card p.sub { color: var(--text-dim); margin: 0 0 24px; font-size: 0.9rem; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.85rem; color: var(--text-dim); margin-bottom: 6px; }
.field input, .field select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
}
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); }
.error-msg {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: var(--danger);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 18px;
}
.auth-card .switch { margin-top: 20px; text-align: center; font-size: 0.88rem; color: var(--text-dim); }
.auth-card button.btn-primary { width: 100%; border: none; }

/* Chat page */
.chat-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 24px;
  padding: 32px 24px;
  max-width: 1200px;
  margin: 0 auto;
  align-items: start;
}
@media (max-width: 860px) {
  .chat-layout { grid-template-columns: 1fr; }
}
.chat-panel, .side-panel .box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.chat-panel {
  display: flex;
  flex-direction: column;
  height: 70vh;
  min-height: 480px;
}
.chat-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.chat-header select {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.85rem;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.msg { max-width: 82%; padding: 10px 14px; border-radius: 10px; font-size: 0.94rem; }
.msg-user { align-self: flex-end; background: var(--accent); color: #06201d; }
.msg-bot { align-self: flex-start; background: var(--bg-elevated); border: 1px solid var(--border); }
.msg-bot.err { border-color: rgba(248, 113, 113, 0.4); color: var(--danger); }
.msg-meta { font-size: 0.72rem; color: var(--text-dim); margin-top: 4px; }
.chat-input-row {
  display: flex;
  gap: 10px;
  padding: 14px;
  border-top: 1px solid var(--border);
}
.chat-input-row input {
  flex: 1;
  padding: 12px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
}
.chat-input-row input:focus { outline: none; border-color: var(--accent); }
.chat-input-row button {
  border: none;
  background: var(--accent);
  color: #06201d;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

.side-panel { display: flex; flex-direction: column; gap: 20px; }
.side-panel .box { padding: 18px; }
.side-panel h3 { margin: 0 0 12px; font-size: 0.95rem; }
.api-key-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  gap: 8px;
}
.api-key-row .key { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.copy-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.72rem;
  cursor: pointer;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.small-btn {
  display: inline-block;
  width: 100%;
  text-align: center;
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-dim);
  border-radius: 8px;
  padding: 8px;
  font-size: 0.82rem;
  cursor: pointer;
}
.small-btn:hover { border-color: var(--accent); color: var(--accent); }

.log-row {
  border-bottom: 1px solid var(--border);
  padding: 8px 0;
  font-size: 0.8rem;
}
.log-row:last-child { border-bottom: none; }
.log-row .q { color: var(--text-dim); }
.log-row .a { color: var(--text); margin-top: 2px; }

.user-email { color: var(--text-dim); font-size: 0.85rem; margin-right: 12px; }