/* ============================================
   iTranSee 2026 - Claude-Inspired Aesthetic
   Warm, Minimalist, Elegant, Human-centric
   ============================================ */

:root {
  /* Warm paper off-white background */
  --bg-primary: #F9F8F5;
  --bg-secondary: #F3F1ED;
  --bg-card: #FFFFFF;
  
  /* Deep, soft dark colors for typography */
  --text-primary: #1C1B1A;
  --text-secondary: #6B6A68;
  --text-muted: #9C9A96;
  
  /* Accent colors - very restrained, earthy/terracotta */
  --accent-primary: #D1644A; /* terracota/rust orange like Claude */
  --accent-dark: #1C1B1A;
  
  /* Borders and elements */
  --border-color: #EAE8E3;
  --border-hover: #D6D3CD;

  /* Shadows - natural, very soft */
  --shadow-sm: 0 2px 8px rgba(28, 27, 26, 0.04);
  --shadow-md: 0 4px 16px rgba(28, 27, 26, 0.06);
  --shadow-lg: 0 12px 32px rgba(28, 27, 26, 0.08);

  /* Rounded corners - slightly crisp */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: 'Crimson Pro', "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  
  --transition: all 0.25s cubic-bezier(0.2, 0, 0, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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;
}

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

/* Base Typo */
.serif-italic {
  color: var(--text-secondary);
}

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

/* Typography elements */
.section-header {
  text-align: center;
  margin-bottom: 72px;
}

.section-badge {
  display: inline-block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 4px;
  margin-bottom: 20px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 44px);
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.2;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  padding: 20px 0;
  transition: var(--transition);
  z-index: 1000;
  background: transparent;
}

.navbar.scrolled {
  background: rgba(249, 248, 245, 0.9);
  backdrop-filter: blur(12px);
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
}

.logo-symbol {
  font-size: 20px;
  color: var(--accent-primary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 36px;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  border-right: 1px solid var(--border-color);
  padding-right: 16px;
  margin-right: 4px;
}

.lang-btn {
  background: none;
  border: none;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
}

.lang-btn.active {
  color: var(--text-primary);
}

.lang-sep {
  color: var(--border-color);
  font-size: 10px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background: var(--text-primary);
  color: #fff;
  border: 1px solid var(--text-primary);
}

.btn-primary:hover {
  background: #000;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}

.btn-outline:hover {
  border-color: var(--text-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
}

.btn-block {
  width: 100%;
}

/* Hero Section */
.hero {
  padding: 180px 0 100px;
  position: relative;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-primary);
  background: rgba(209, 100, 74, 0.08);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-sans);
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 28px;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 32px;
  padding-top: 40px;
}

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

.stat-value {
  font-family: var(--font-serif);
  font-size: 28px;
  color: var(--text-primary);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-divider {
  width: 1px;
  height: 24px;
  background: var(--border-color);
}

/* Mac-like subtle mockup */
.hero-visual {
  margin-top: 60px;
  display: flex;
  justify-content: center;
}

.hero-app-mockup {
  width: 100%;
  max-width: 860px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  text-align: left;
}

.mockup-header {
  height: 48px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 16px;
}

.mockup-dots span {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #dbd8d1;
  margin-right: 6px;
}

.mockup-body {
  display: flex;
  height: 320px;
}

.mockup-sidebar {
  width: 200px;
  background: #FAFAFA;
  border-right: 1px solid var(--border-color);
  padding: 16px 12px;
}

.mockup-sidebar-item {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  margin-bottom: 4px;
}

.mockup-sidebar-item.active {
  background: white;
  box-shadow: var(--shadow-sm);
  color: var(--text-primary);
  font-weight: 500;
}

.mockup-content {
  flex: 1;
  padding: 24px;
  font-family: 'Crimson Pro', serif;
  font-size: 16px;
}

.mockup-row {
  display: flex;
  gap: 24px;
  margin-bottom: 16px;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}

.mockup-row.active-row {
  background: var(--bg-primary);
  border-color: var(--border-color);
}

.mockup-cell {
  flex: 1;
  line-height: 1.6;
}

.mockup-cell.source {
  color: var(--text-secondary);
}

.mockup-cell.target {
  color: var(--text-primary);
}

.cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent-primary);
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

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

/* Features */
.features {
  padding: 120px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 48px 32px;
}

.feature-card {
  padding-right: 16px;
}

.feature-icon {
  font-size: 24px;
  color: var(--accent-primary);
  margin-bottom: 16px;
  font-family: var(--font-serif);
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Screenshots / Preview */
.screenshots {
  padding: 120px 0;
}

.screenshots-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}

.screenshot-tab {
  background: transparent;
  border: 1px solid var(--border-hover);
  padding: 8px 24px;
  border-radius: 40px;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.screenshot-tab:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

.screenshot-tab.active {
  background: var(--text-primary);
  border-color: var(--text-primary);
  color: white;
}

.screenshot-display {
  display: flex;
  justify-content: center;
}

.screenshot-card {
  display: none;
  width: 100%;
  max-width: 800px;
  animation: fadeUp 0.4s ease forwards;
}

.screenshot-card.active {
  display: block;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.screenshot-placeholder {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 80px 40px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.screenshot-placeholder h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 12px;
}

.screenshot-placeholder p {
  color: var(--text-secondary);
  font-size: 15px;
}

/* Pricing Section */
.pricing {
  padding: 120px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pricing-card {
  padding: 40px 32px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  background: var(--bg-card);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-8px);
}

.pricing-header h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
}

.pricing-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.pricing-price {
  margin-bottom: 32px;
}

.price-currency {
  font-size: 18px;
  color: var(--text-secondary);
  vertical-align: top;
  margin-right: 2px;
}

.price-amount {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1;
}

.price-period {
  font-size: 14px;
  color: var(--text-secondary);
}

.pricing-features {
  list-style: none;
  margin-bottom: 40px;
  flex: 1;
}

.pricing-features li {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.pricing-features .chk {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  margin-top: 8px;
}

.pricing-card.featured .chk {
  background: var(--accent-primary);
}

/* FAQ */
.faq {
  padding: 120px 0;
}

.faq-grid {
  max-width: 680px;
  margin: 0 auto;
}

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

.faq-question {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  text-align: left;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  font-family: var(--font-sans);
}

.faq-arrow {
  color: var(--text-muted);
  font-size: 20px;
  font-weight: 300;
  transition: transform 0.3s;
}

.faq-item.open .faq-arrow {
  transform: rotate(45deg);
}

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

.faq-item.open .faq-answer {
  max-height: 200px;
  padding-bottom: 24px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Footer */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .pricing-card.featured { transform: none; }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions > a { display: none; }
  .hero-title { font-size: 36px; }
  .features-grid { grid-template-columns: 1fr; }
  .stat-divider { display: none; }
  .hero-stats { flex-direction: column; gap: 20px; }
  .mockup-sidebar { display: none; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}