/* ============================================
   Codex App — Styles
   Inspired by autoresearch.lol layout
   ============================================ */

/* --- Variables --- */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #14141d;
  --bg-elevated: #1a1a26;
  --text-primary: #e8e8ed;
  --text-secondary: #8a8a9a;
  --text-tertiary: #5a5a6a;
  --accent: #22d3ee;
  --accent-dim: #0e7c8a;
  --accent-subtle: rgba(34, 211, 238, 0.08);
  --accent-purple: #6366f1;
  --success: #4ade80;
  --warning: #fbbf24;
  --error: #f87171;
  --border: #1e1e2e;
  --border-light: #2a2a3e;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "JetBrains Mono", "Cascadia Code", Consolas, monospace;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- Container --- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo a {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.logo-text {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.logo-accent {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-cta {
  display: none;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-cta:hover {
  background: var(--accent-subtle);
}

@media (min-width: 768px) {
  .nav-cta {
    display: block;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
}

/* --- Hero Section --- */
.hero {
  padding: 140px 0 80px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.badge {
  display: inline-flex;
  align-items: center;
  background: var(--accent-subtle);
  border: 1px solid rgba(34, 211, 238, 0.15);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-purple));
  color: #000;
  border: none;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 24px rgba(34, 211, 238, 0.25);
}

.btn-primary svg {
  flex-shrink: 0;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--text-tertiary);
}

.hero-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

.meta-item svg {
  flex-shrink: 0;
  opacity: 0.6;
}

/* --- Terminal Window --- */
.terminal-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-family: var(--font-mono);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot.red { background: var(--error); }
.terminal-dot.yellow { background: var(--warning); }
.terminal-dot.green { background: var(--success); }

.terminal-title {
  margin-left: 12px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.terminal-body {
  padding: 20px;
  font-size: 0.85rem;
  line-height: 1.8;
}

.terminal-body .line {
  margin-bottom: 2px;
}

.terminal-body .prompt {
  color: var(--success);
  margin-right: 6px;
}

.terminal-body .cmd {
  color: var(--text-primary);
}

.terminal-body .output {
  color: var(--text-secondary);
}

.terminal-body .dim {
  color: var(--text-tertiary);
}

.terminal-body .success {
  color: var(--success);
}

.terminal-body .spacer {
  height: 6px;
}

.cursor-blink {
  animation: blink 1s step-end infinite;
  color: var(--accent);
}

@keyframes blink {
  50% { opacity: 0; }
}

/* --- Section Common --- */
.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

/* --- Overview Cards --- */
.overview-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .overview-cards {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  border-radius: var(--radius-sm);
  color: var(--accent);
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* --- Features Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .features-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.feature-item {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-item:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.feature-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 12px;
  font-weight: 700;
}

.feature-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-item p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* --- Workflow Steps --- */
.workflow-steps {
  max-width: 700px;
  margin: 0 auto;
}

.workflow-step {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.workflow-step:last-child {
  border-bottom: none;
}

.step-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-subtle);
  border: 1px solid rgba(34, 211, 238, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}

.step-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.step-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* --- Demo Terminal (large) --- */
.demo-terminal {
  max-width: 780px;
  margin: 0 auto;
}

.terminal-window.large .terminal-body {
  min-height: 280px;
}

/* --- Setup Grid --- */
.setup-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .setup-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.setup-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: border-color 0.2s, transform 0.2s;
}

.setup-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.setup-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  border-radius: var(--radius-sm);
  color: var(--accent);
  margin-bottom: 14px;
}

.setup-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.setup-card p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* --- FAQ --- */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  user-select: none;
}

.faq-question svg {
  flex-shrink: 0;
  transition: transform 0.25s;
  color: var(--text-tertiary);
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

.faq-answer p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center, rgba(34, 211, 238, 0.02) 0%, transparent 70%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.cta-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

.btn-large {
  padding: 16px 36px;
  font-size: 1rem;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 12px;
  line-height: 1.6;
  max-width: 300px;
}

.footer-links h4 {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 10px;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

.footer-bottom p {
  color: var(--text-tertiary);
  font-size: 0.8rem;
}

/* --- Selection --- */
::selection {
  background: rgba(34, 211, 238, 0.2);
  color: var(--text-primary);
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}