/* ========== CSS Variables ========== */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #2563eb;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --gradient-1: linear-gradient(135deg, #3b82f6, #6366f1);
  --gradient-2: linear-gradient(135deg, #06b6d4, #3b82f6);
  --gradient-hero: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
  --radius: 12px;
  --max-width: 1200px;
  --transition: all 0.3s ease;
}

/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ========== Animations ========== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 4px 15px rgba(59,130,246,0.2); }
  50% { box-shadow: 0 4px 25px rgba(59,130,246,0.35); }
}
@keyframes countUp { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Navbar ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  border-bottom-color: var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-logo svg { flex-shrink: 0; }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}
.nav-links a:hover { color: var(--accent-light); }
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-1);
  transition: width 0.3s ease;
}
.nav-links a:hover::after { width: 100%; }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  animation: slideDown 0.3s ease;
}
.mobile-menu.active { display: block; }
.mobile-menu a {
  display: block;
  padding: 12px 0;
  color: var(--text-secondary);
  font-size: 16px;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { color: var(--accent-light); }

/* ========== Hero Section ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding-top: 64px;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(59,130,246,0.04) 0%, transparent 50%),
              radial-gradient(circle at 70% 50%, rgba(99,102,241,0.03) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 60px 24px;
  animation: fadeInUp 0.8s ease;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(59,130,246,0.08);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: 20px;
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero h1 .highlight {
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--gradient-1);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  animation: pulse-glow 3s ease-in-out infinite;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59,130,246,0.3);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-secondary:hover {
  border-color: var(--accent);
  background: rgba(59,130,246,0.05);
  color: var(--accent);
}

/* ========== Stats Section ========== */
.stats-section {
  padding: 60px 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: relative;
}
.stats-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-1);
  opacity: 0.3;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item { padding: 24px; }
.stat-number {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat-label {
  color: var(--text-secondary);
  font-size: 15px;
  margin-top: 8px;
}

/* ========== Section Commons ========== */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(59,130,246,0.06);
  border: 1px solid rgba(59,130,246,0.12);
  border-radius: 16px;
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.section-header h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 16px;
}
.section-header p {
  color: var(--text-secondary);
  font-size: 17px;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ========== Features Grid ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-1);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}
.feature-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(59,130,246,0.08);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
}
.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ========== Scenarios Section ========== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
}
.scenario-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(59,130,246,0.2);
}
.scenario-card .scenario-icon {
  font-size: 40px;
  margin-bottom: 20px;
}
.scenario-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}
.scenario-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}

/* ========== Text Processing Grid ========== */
.text-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

/* ========== Media Processing ========== */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.media-card:hover {
  border-color: rgba(59,130,246,0.2);
  transform: translateY(-3px);
}
.media-card .media-icon { font-size: 36px; margin-bottom: 16px; }
.media-card h4 { font-size: 16px; margin-bottom: 8px; }
.media-card p { color: var(--text-secondary); font-size: 13px; line-height: 1.6; }

/* ========== Free Section ========== */
.free-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.free-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.free-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
}
.free-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: rgba(34,197,94,0.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #16a34a;
  font-size: 18px;
}
.free-item h4 { font-size: 15px; margin-bottom: 4px; }
.free-item p { color: var(--text-secondary); font-size: 13px; line-height: 1.5; }

/* ========== Easy Steps ========== */
.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 40px;
}
.step-card {
  text-align: center;
  padding: 32px 20px;
  position: relative;
}
.step-number {
  width: 56px;
  height: 56px;
  background: var(--gradient-1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  color: white;
  margin: 0 auto 20px;
}
.step-card h4 { font-size: 17px; margin-bottom: 8px; }
.step-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.6; }
.step-arrow {
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 24px;
}

/* ========== Comparison Table ========== */
.comparison-section { overflow-x: auto; }
.comparison-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 40px;
}
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}
.comparison-table thead { background: #f8fafc; }
.comparison-table th {
  padding: 16px 20px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}
.comparison-table th.highlight-col {
  color: var(--accent);
  background: rgba(59,130,246,0.06);
}
.comparison-table td {
  padding: 14px 20px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table tr:hover td { background: #f8fafc; }
.comparison-table td.highlight-col {
  color: var(--accent);
  font-weight: 500;
  background: rgba(59,130,246,0.04);
}
.comparison-table td.highlight-col:hover { background: rgba(59,130,246,0.08); }
.yes { color: #22c55e !important; font-weight: 600; }
.no { color: #ef4444 !important; }
.partial { color: #f59e0b !important; }

/* ========== Founder Section ========== */
.founder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 40px;
  max-width: 800px;
  margin: 0 auto;
}
.founder-card {
  text-align: center;
  padding: 40px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.founder-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.founder-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto 20px;
  background: var(--gradient-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: white;
  font-weight: 700;
  border: 3px solid rgba(59,130,246,0.2);
  overflow: hidden;
}
.founder-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.founder-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}
.founder-card .founder-title {
  color: var(--accent);
  font-size: 14px;
  margin-bottom: 16px;
}
.founder-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}

/* ========== Contact Section ========== */
.contact-section { background: var(--bg-secondary); border-top: 1px solid var(--border); }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 32px;
}
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.contact-card:hover {
  border-color: rgba(59,130,246,0.2);
}
.contact-icon {
  font-size: 28px;
  margin-bottom: 16px;
}
.contact-card h3 { font-size: 18px; margin-bottom: 12px; }
.contact-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }
.contact-card a { color: var(--accent); transition: var(--transition); }
.contact-card a:hover { color: var(--accent-hover); }
.timeline { margin-top: 24px; }
.timeline-item {
  display: flex;
  gap: 16px;
  padding: 12px 0;
  border-left: 2px solid var(--border);
  padding-left: 20px;
  position: relative;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
}
.timeline-item .year {
  flex-shrink: 0;
  color: var(--accent);
  font-weight: 600;
  font-size: 14px;
  min-width: 50px;
}
.timeline-item .desc { color: var(--text-secondary); font-size: 14px; }

/* ========== Footer ========== */
.footer {
  padding: 40px 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
}
.footer-cta {
  width: 100%;
  padding: 18px;
  background: var(--gradient-1);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: block;
  text-align: center;
  margin-bottom: 16px;
}
.footer-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(59,130,246,0.4);
}
.footer-cta.secondary-cta {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
}
.footer-cta.secondary-cta:hover {
  background: rgba(59,130,246,0.05);
}
.footer-copyright {
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  padding-top: 20px;
}

/* ========== Video Tutorial Section ========== */
.video-section { background: var(--bg-secondary); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.video-wrapper {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 40px auto 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
 box-shadow: var(--shadow-lg);
 background: #000;
}
.video-wrapper::before {
  content: '';
  display: block;
  padding-top: 56.25%; /* 16:9 */
}
.video-wrapper iframe,
.video-wrapper video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}
.video-desc {
  text-align: center;
  margin-top: 20px;
  color: var(--text-secondary);
  font-size: 15px;
}
.video-desc a { color: var(--accent); text-decoration: underline; transition: var(--transition); }
.video-desc a:hover { color: var(--accent-hover); }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .features-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .media-grid { grid-template-columns: repeat(2, 1fr); }
  .text-grid { grid-template-columns: repeat(2, 1fr); }
  .founder-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .step-arrow { display: none; }
  .section { padding: 70px 0; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary { width: 100%; max-width: 300px; justify-content: center; }
  .comparison-table { font-size: 13px; }
  .comparison-table th, .comparison-table td { padding: 10px 12px; }
}
@media (max-width: 480px) {
  .media-grid { grid-template-columns: 1fr; }
  .text-grid { grid-template-columns: 1fr; }
  .free-features { grid-template-columns: 1fr; }
  .steps-container { grid-template-columns: 1fr; }
}