/* ── Reset & Base ─────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0f;
  --bg2: #12121a;
  --bg3: #1a1a2e;
  --surface: #16213e;
  --border: #2a2a4a;
  --text: #e2e8f0;
  --text-dim: #8892a6;
  --accent: #6c63ff;
  --accent2: #00d2ff;
  --green: #00e676;
  --orange: #ff9100;
  --pink: #ff4081;
  --yellow: #ffd600;
  --radius: 12px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ── Hero ────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  padding: 80px 0 60px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(108,99,255,0.08) 0%, transparent 50%),
              radial-gradient(circle at 70% 50%, rgba(0,210,255,0.06) 0%, transparent 50%);
  animation: pulse 8s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.hero-badge {
  display: inline-block;
  background: rgba(108,99,255,0.15);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
  border: 1px solid rgba(108,99,255,0.3);
  position: relative;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, #fff, var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  position: relative;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

/* ── Section Titles ──────────────────────────── */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
}
.section-desc {
  text-align: center;
  color: var(--text-dim);
  margin-bottom: 40px;
}

/* ── Strategy Cards ──────────────────────────── */
.strategies-section { padding: 80px 0; }
.strategy-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all 0.3s ease;
  cursor: default;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: 0;
  transition: opacity 0.3s;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(108,99,255,0.15);
}
.card:hover::before { opacity: 1; }
.card-icon { font-size: 2rem; margin-bottom: 12px; }
.card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 4px; }
.card-label {
  font-size: 0.8rem;
  color: var(--accent2);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}
.card p { font-size: 0.9rem; color: var(--text-dim); line-height: 1.5; }
.card-tag {
  margin-top: 16px;
  font-size: 0.75rem;
  background: rgba(0,210,255,0.1);
  color: var(--accent2);
  padding: 4px 10px;
  border-radius: 6px;
  display: inline-block;
}

/* ── Tools Section ───────────────────────────── */
.tools-section {
  padding: 60px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}
.tool-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg3);
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.tool-icon { font-size: 1.5rem; }
.tool-item strong { color: var(--accent); white-space: nowrap; }
.tool-item span:last-child { color: var(--text-dim); font-size: 0.9rem; }

/* ── Demo Section ────────────────────────────── */
.demo-section { padding: 80px 0; }
.demo-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 32px;
}
.input-group {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}
.input-group input {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 14px 18px;
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  transition: border 0.3s;
}
.input-group input:focus { border-color: var(--accent); }
.input-group input::placeholder { color: var(--text-dim); }

#compareBtn {
  background: linear-gradient(135deg, var(--accent), #5a52e0);
  color: white;
  border: none;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  white-space: nowrap;
}
#compareBtn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(108,99,255,0.4);
}
#compareBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.quick-questions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.quick-questions span { color: var(--text-dim); font-size: 0.85rem; }
.quick-questions button {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}
.quick-questions button:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ── Loading ─────────────────────────────────── */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px;
  color: var(--text-dim);
}
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.hidden { display: none !important; }

/* ── Results ─────────────────────────────────── */
.results { display: flex; flex-direction: column; gap: 20px; }

.result-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s;
}
.result-card:hover { border-color: var(--accent); }

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--bg3);
  cursor: pointer;
  user-select: none;
}
.result-header h3 { font-size: 1.1rem; font-weight: 600; }

.result-meta {
  display: flex;
  gap: 16px;
  font-size: 0.85rem;
}
.meta-badge {
  padding: 3px 10px;
  border-radius: 6px;
  font-weight: 600;
}
.meta-steps { background: rgba(108,99,255,0.15); color: var(--accent); }
.meta-tools { background: rgba(0,210,255,0.15); color: var(--accent2); }

.result-answer {
  padding: 16px 24px;
  background: rgba(0,230,118,0.05);
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}
.result-answer strong { color: var(--green); }

.result-logs {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.result-logs.expanded { max-height: 600px; overflow-y: auto; }

.log-line {
  font-family: 'Cascadia Code', 'Fira Code', monospace;
  font-size: 0.8rem;
  padding: 2px 0;
  color: var(--text-dim);
}
.log-line.thought { color: var(--yellow); }
.log-line.action { color: var(--accent); }
.log-line.observation { color: var(--green); }
.log-line.step { color: var(--orange); font-weight: 600; }
.log-line.final { color: var(--pink); font-weight: 700; }
.log-line.meta { color: var(--text-dim); font-style: italic; }

.toggle-logs {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}
.toggle-logs:hover { color: var(--accent); border-color: var(--accent); }

/* ── How It Works ────────────────────────────── */
.how-section {
  padding: 80px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
}
.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.flow-step {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  width: 180px;
  transition: all 0.3s;
}
.flow-step:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.flow-num {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  margin: 0 auto 12px;
}
.flow-step h4 { font-size: 0.95rem; margin-bottom: 6px; }
.flow-step p { font-size: 0.78rem; color: var(--text-dim); }
.flow-arrow {
  font-size: 1.5rem;
  color: var(--accent);
  font-weight: 700;
}

/* ── Footer ──────────────────────────────────── */
footer {
  padding: 30px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* ── Responsive ──────────────────────────────── */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .strategy-cards { grid-template-columns: 1fr; }
  .input-group { flex-direction: column; }
  .flow-diagram { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
}