/* ========== RESET & BASE ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0b;
  --bg-elevated: #111113;
  --bg-card: #16161a;
  --bg-code: #1a1a1f;
  --border: #222228;
  --border-light: #2a2a32;
  --text: #e8e8ed;
  --text-secondary: #8b8b96;
  --text-muted: #5c5c66;
  --accent: #00d4aa;
  --accent-dim: #00d4aa22;
  --accent-blue: #3b82f6;
  --accent-blue-dim: #3b82f622;
  --danger: #ef4444;
  --danger-dim: #ef444422;
  --warning: #f59e0b;
  --warning-dim: #f59e0b22;
  --success: #22c55e;
  --gradient: linear-gradient(135deg, #00d4aa, #3b82f6);
  --gradient-text: linear-gradient(135deg, #00d4aa 0%, #3b82f6 100%);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --max-width: 1120px;
  --section-padding: 120px 0;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }

::selection { background: var(--accent); color: var(--bg); }

/* ========== UTILITY ========== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--section-padding); position: relative; }
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}
.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
}
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Dividers */
.section + .section { border-top: 1px solid var(--border); }

/* ========== NAV ========== */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
nav.scrolled { box-shadow: 0 1px 24px rgba(0,0,0,0.4); }

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.nav-logo .logo-icon {
  width: 28px; height: 28px;
  background: var(--gradient);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 800; color: var(--bg);
}

.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); opacity: 1; }

.nav-cta {
  font-size: 0.8rem !important;
  font-weight: 600 !important;
  color: var(--bg) !important;
  background: var(--text);
  padding: 7px 16px;
  border-radius: 6px;
  transition: background 0.2s, transform 0.2s !important;
}
.nav-cta:hover { background: var(--accent) !important; transform: translateY(-1px); }

.nav-hamburger {
  display: none;
  background: none; border: none; cursor: pointer;
  width: 32px; height: 32px;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-hamburger span {
  display: block; width: 20px; height: 2px;
  background: var(--text); border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ========== HERO ========== */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px; left: 50%; transform: translateX(-50%);
  width: 800px; height: 800px;
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center; gap: 8px;
  padding: 6px 16px;
  border: 1px solid var(--border-light);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  background: var(--bg-elevated);
}
.hero-badge .dot {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 8px;
}

.hero-tagline {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 48px;
}
.hero-tagline strong { color: var(--text-secondary); font-weight: 600; }

/* Terminal */
.terminal {
  max-width: 560px;
  margin: 0 auto 48px;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: left;
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,0.4);
}
.terminal-header {
  padding: 12px 16px;
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border);
}
.terminal-dot {
  width: 10px; height: 10px; border-radius: 50%;
}
.terminal-dot:nth-child(1) { background: #ff5f57; }
.terminal-dot:nth-child(2) { background: #febc2e; }
.terminal-dot:nth-child(3) { background: #28c840; }
.terminal-title {
  flex: 1; text-align: center;
  font-size: 0.75rem; color: var(--text-muted);
  font-family: var(--font-mono);
  margin-right: 36px;
}
.terminal-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
}
.terminal-line .prompt { color: var(--accent); }
.terminal-line .cmd { color: var(--text); }
.terminal-line .flag { color: var(--accent-blue); }
.terminal-line .comment { color: var(--text-muted); }

/* CTA buttons */
.cta-group {
  display: flex; gap: 12px;
  justify-content: center; flex-wrap: wrap;
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}
.btn-primary {
  background: var(--text);
  color: var(--bg);
}
.btn-primary:hover { background: var(--accent); color: var(--bg); transform: translateY(-2px); box-shadow: 0 8px 32px var(--accent-dim); }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-light);
}
.btn-secondary:hover { border-color: var(--text-muted); transform: translateY(-2px); }

.btn svg { width: 18px; height: 18px; }

/* ========== PROBLEM ========== */
.problem-content { max-width: 800px; }
.problem-content .lead {
  font-size: 1.25rem;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 40px;
  font-weight: 400;
}
.problem-content .lead strong {
  color: var(--danger);
  font-weight: 600;
}

.risk-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 32px;
}
.risk-card {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s;
}
.risk-card:hover { border-color: var(--danger); }
.risk-card .risk-icon {
  font-size: 1.5rem;
  margin-bottom: 12px;
  display: block;
}
.risk-card h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.risk-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========== HOW IT WORKS ========== */
.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin: 48px 0;
  flex-wrap: wrap;
}
.flow-node {
  padding: 16px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  min-width: 140px;
}
.flow-node.highlight {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}
.flow-arrow {
  font-size: 1.2rem;
  color: var(--text-muted);
  padding: 0 12px;
  flex-shrink: 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.step-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
}
.step-number {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.step-card h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.step-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Telegram mockup */
.telegram-mockup {
  max-width: 380px;
  margin: 48px auto 0;
  background: #1b2836;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 16px 64px rgba(0,0,0,0.3);
}
.tg-header {
  padding: 12px 16px;
  background: #17212b;
  display: flex; align-items: center; gap: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.tg-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 800; color: #fff;
}
.tg-header-text h5 { font-size: 0.85rem; font-weight: 600; color: #fff; }
.tg-header-text span { font-size: 0.7rem; color: #6d7f8f; }
.tg-body { padding: 16px; }
.tg-message {
  background: #1e3a5f;
  padding: 12px 14px;
  border-radius: 12px 12px 12px 4px;
  margin-bottom: 12px;
  font-size: 0.82rem;
  line-height: 1.55;
  color: #e3e6e8;
}
.tg-message .tg-bold { font-weight: 600; color: #fff; }
.tg-message code {
  background: rgba(0,0,0,0.3);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.tg-buttons {
  display: flex; gap: 8px; margin-top: 8px;
}
.tg-btn {
  flex: 1;
  padding: 10px;
  border-radius: 8px;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: default;
}
.tg-btn-approve { background: #22c55e22; color: #22c55e; border: 1px solid #22c55e44; }
.tg-btn-deny { background: #ef444422; color: #ef4444; border: 1px solid #ef444444; }

/* ========== COMPARISON TABLE ========== */
.comparison-wrapper {
  overflow-x: auto;
  margin-top: 40px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 600px;
}
.comparison-table th, .comparison-table td {
  padding: 14px 20px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.comparison-table th {
  background: var(--bg-card);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}
.comparison-table th:first-child { text-align: left; }
.comparison-table td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--text);
}
.comparison-table th:last-child, .comparison-table td:last-child {
  background: var(--accent-dim);
}
.comparison-table th:last-child { color: var(--accent); }
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table .check { color: var(--success); font-size: 1.1rem; }
.comparison-table .cross { color: var(--danger); font-size: 1.1rem; }
.comparison-table .na { color: var(--text-muted); font-size: 0.8rem; }

/* ========== PROGRESSIVE COMPLEXITY ========== */
.levels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.level-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.3s, transform 0.3s;
}
.level-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.level-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}
.level-badge.l1 { background: #22c55e22; color: #22c55e; }
.level-badge.l2 { background: #3b82f622; color: #3b82f6; }
.level-badge.l3 { background: #a855f722; color: #a855f7; }
.level-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.level-card .level-time {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.level-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.level-card .level-features {
  margin-top: 16px;
  list-style: none;
}
.level-card .level-features li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 4px 0;
  display: flex; align-items: center; gap: 8px;
}
.level-card .level-features li::before {
  content: '→';
  color: var(--accent);
  font-weight: 600;
}

/* ========== CODE BLOCKS ========== */
.code-block {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin: 16px 0;
}
.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border);
}
.code-lang {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.copy-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: none; border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.2s;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn.copied { border-color: var(--success); color: var(--success); }
.code-body {
  padding: 20px;
  overflow-x: auto;
}
.code-body pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.75;
  color: var(--text);
}

/* Syntax colors */
.syn-comment { color: var(--text-muted); }
.syn-keyword { color: #c084fc; }
.syn-string { color: #22c55e; }
.syn-key { color: #3b82f6; }
.syn-value { color: #f59e0b; }
.syn-cmd { color: var(--text); }
.syn-flag { color: var(--accent-blue); }
.syn-prompt { color: var(--accent); }

/* ========== AGENT PROMPT (KILLER FEATURE) ========== */
.prompt-section { background: var(--bg-elevated); }
.prompt-box {
  margin-top: 40px;
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 0 60px var(--accent-dim), 0 24px 80px rgba(0,0,0,0.3);
}
.prompt-header {
  padding: 20px 24px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(0, 212, 170, 0.15);
}
.prompt-header h4 {
  font-size: 0.95rem;
  color: var(--accent);
  font-weight: 700;
  display: flex; align-items: center; gap: 8px;
}
.prompt-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.8;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
}
.prompt-body .placeholder {
  background: var(--warning-dim);
  color: var(--warning);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.prompt-tabs {
  display: flex; gap: 0; margin-top: 40px; margin-bottom: 0;
}
.prompt-tab {
  padding: 10px 24px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-bottom: none;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}
.prompt-tab:first-child { margin-left: 2px; }
.prompt-tab.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
}

/* ========== POLICY ========== */
.policy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 40px;
  align-items: start;
}
.policy-explanation h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 12px;
}
.policy-explanation p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}
.policy-list {
  list-style: none;
}
.policy-list li {
  padding: 8px 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex; align-items: flex-start; gap: 10px;
}
.policy-list .policy-icon { font-size: 1rem; flex-shrink: 0; margin-top: 2px; }

/* ========== SETUP GUIDE ========== */
.setup-steps { margin-top: 40px; max-width: 640px; }
.setup-step {
  display: flex; gap: 20px;
  margin-bottom: 32px;
}
.setup-step-num {
  width: 36px; height: 36px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; font-weight: 700;
  margin-top: 4px;
}
.setup-step-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.setup-step-content p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

/* ========== FOOTER ========== */
footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-links {
  display: flex; gap: 24px;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}
.footer-links a:hover { color: var(--text); }
.footer-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-badge {
  display: inline-flex;
  align-items: center; gap: 6px;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  :root { --section-padding: 80px 0; }

  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: var(--bg-elevated);
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    gap: 16px;
  }

  .hero { padding: 120px 0 80px; }
  .hero h1 { font-size: 2.25rem; }

  .flow-diagram { flex-direction: column; gap: 8px; }
  .flow-arrow { transform: rotate(90deg); padding: 4px 0; }

  .policy-grid { grid-template-columns: 1fr; }

  .footer-inner { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }

  .comparison-wrapper { margin-left: -24px; margin-right: -24px; border-radius: 0; border-left: none; border-right: none; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.9rem; }
  .terminal-body { font-size: 0.75rem; padding: 14px; }
  .levels-grid { grid-template-columns: 1fr; }
  .risk-cards { grid-template-columns: 1fr; }
}

/* ========== ANIMATIONS ========== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}