/* Video to Prompt - Shared Styles */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --bg-secondary: #f8f9fc;
  --bg-tertiary: #f0f2f8;
  --text: #1a1a2e;
  --text-secondary: #5a5a7a;
  --text-muted: #9090a8;
  --border: #e2e4ef;
  --accent: #6c5ce7;
  --accent-light: #a29bfe;
  --accent-glow: rgba(108,92,231,0.15);
  --gradient: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 50%, #fd79a8 100%);
  --card-bg: #ffffff;
  --card-shadow: 0 2px 16px rgba(0,0,0,0.06);
  --card-hover-shadow: 0 8px 32px rgba(0,0,0,0.1);
  --input-bg: #f8f9fc;
  --tag-bg: #f0edff;
  --tag-text: #6c5ce7;
  --success: #00b894;
  --warning: #fdcb6e;
  --error: #e17055;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="dark"] {
  --bg: #0f0f1a;
  --bg-secondary: #151525;
  --bg-tertiary: #1a1a30;
  --text: #e8e8f0;
  --text-secondary: #a0a0bc;
  --text-muted: #6a6a88;
  --border: #2a2a44;
  --card-bg: #181830;
  --card-shadow: 0 2px 16px rgba(0,0,0,0.3);
  --card-hover-shadow: 0 8px 32px rgba(0,0,0,0.5);
  --input-bg: #1a1a30;
  --tag-bg: #252545;
  --tag-text: #a29bfe;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-light); }

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

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border: none; border-radius: var(--radius);
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all var(--transition); white-space: nowrap;
}
.btn-primary { background: var(--gradient); color: #fff; box-shadow: 0 4px 16px var(--accent-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px var(--accent-glow); }
.btn-secondary { background: var(--bg-tertiary); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-lg { padding: 16px 36px; font-size: 17px; border-radius: var(--radius-lg); }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* Header */
.header {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg); border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700; color: var(--text);
}
.logo-icon {
  width: 34px; height: 34px; border-radius: 10px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 16px;
}
.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav-links a {
  padding: 8px 14px; border-radius: 8px;
  color: var(--text-secondary); font-size: 13px; font-weight: 500;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); background: var(--tag-bg); }
.header-actions { display: flex; align-items: center; gap: 8px; }

.theme-toggle, .lang-toggle {
  width: 36px; height: 36px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bg-secondary);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: 15px; color: var(--text-secondary);
}

/* Page Hero */
.page-hero {
  background: linear-gradient(135deg, #2d1b69 0%, #1a1a2e 100%);
  color: #fff; padding: 60px 0; text-align: center;
}
.page-hero h1 { font-size: 32px; font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 16px; color: rgba(255,255,255,0.6); max-width: 600px; margin: 0 auto; }
.page-hero .badge {
  display: inline-block; padding: 5px 14px; border-radius: 20px;
  background: rgba(255,255,255,0.1); font-size: 12px; margin-bottom: 16px;
}

/* Section */
.section { padding: 60px 0; }
.section-header { text-align: center; margin-bottom: 40px; }
.section-header h2 { font-size: 28px; font-weight: 800; margin-bottom: 8px; }
.section-header p { font-size: 15px; color: var(--text-secondary); max-width: 500px; margin: 0 auto; }

/* Forms */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.form-group textarea, .form-group input, .form-group select {
  width: 100%; padding: 14px 16px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--input-bg);
  color: var(--text); font-size: 14px; font-family: inherit;
  transition: border-color var(--transition); resize: vertical;
}
.form-group textarea:focus, .form-group input:focus, .form-group select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-group textarea { min-height: 100px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* Result Box */
.result-box {
  margin-top: 24px; padding: 24px; border-radius: var(--radius);
  background: var(--bg-tertiary); border: 1px solid var(--border); display: none;
}
.result-box.show { display: block; animation: fadeInUp 0.4s ease; }
.result-content { font-size: 14px; line-height: 1.8; color: var(--text); white-space: pre-wrap; }

/* Upload Zone */
.upload-zone {
  width: 100%; max-width: 500px; margin: 0 auto 32px;
  height: 220px; border: 2px dashed var(--border);
  border-radius: var(--radius-xl); display: flex; flex-direction: column;
  align-items: center; justify-content: center; cursor: pointer;
  background: var(--bg-secondary); overflow: hidden; position: relative;
}
.upload-zone:hover, .upload-zone.drag-over { border-color: var(--accent); background: var(--tag-bg); }
.upload-zone.has-file { border-style: solid; border-color: var(--accent); }
.upload-zone img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
}
.upload-zone .placeholder { text-align: center; color: var(--text-muted); z-index: 1; }
.upload-zone .placeholder .icon { font-size: 40px; margin-bottom: 8px; }
.upload-zone .placeholder p { font-size: 14px; }
.upload-zone.has-file .placeholder { display: none; }

/* Features Grid */
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px;
}
.feature-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px; transition: all var(--transition);
}
.feature-card:hover { transform: translateY(-3px); box-shadow: var(--card-hover-shadow); border-color: transparent; }
.feature-card .icon { font-size: 28px; margin-bottom: 16px; }
.feature-card h3 { font-size: 17px; margin-bottom: 8px; font-weight: 700; }
.feature-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

/* Footer */
.footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 48px 0 28px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
.footer-col h4 { font-size: 14px; font-weight: 700; margin-bottom: 14px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: var(--text-secondary); }
.footer-col ul li a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 20px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; color: var(--text-muted);
}

/* Toast */
.toast {
  position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%) translateY(80px);
  background: var(--text); color: var(--bg); padding: 14px 28px;
  border-radius: var(--radius); font-size: 14px; font-weight: 600;
  z-index: 1000; transition: transform 0.35s ease; pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); }
.toast.success { background: var(--success); color: #fff; }
.toast.error { background: var(--error); color: #fff; }

/* Spinner */
.spinner {
  display: inline-block; width: 20px; height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff; border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
.spinner.dark { border-color: rgba(0,0,0,0.1); border-top-color: var(--accent); }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

.copy-btn {
  margin-top: 12px; display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; font-size: 13px; font-weight: 600;
  border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text-secondary); cursor: pointer;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn.copied { background: var(--success); color: #fff; border-color: var(--success); }

/* Content page styles */
.content-page { padding: 60px 0; }
.content-page h2 { font-size: 24px; font-weight: 800; margin: 36px 0 16px; }
.content-page h2:first-child { margin-top: 0; }
.content-page h3 { font-size: 18px; font-weight: 700; margin: 24px 0 12px; }
.content-page p, .content-page li { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 12px; }
.content-page ul, .content-page ol { padding-left: 24px; margin-bottom: 16px; }

/* Sitemap */
.sitemap-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px;
}
.sitemap-col h3 { font-size: 16px; font-weight: 700; margin-bottom: 12px; color: var(--accent); }
.sitemap-col a { display: block; padding: 8px 0; font-size: 14px; color: var(--text-secondary); border-bottom: 1px solid var(--border); }
.sitemap-col a:hover { color: var(--accent); }
.sitemap-col a .arrow { float: right; opacity: 0.4; }

/* Back link */
.back-link { display: inline-flex; align-items: center; gap: 6px; color: var(--text-muted); font-size: 13px; margin-bottom: 24px; }
.back-link:hover { color: var(--accent); }

/* Responsive */
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .form-row { grid-template-columns: 1fr; }
  .page-hero { padding: 40px 0; }
  .page-hero h1 { font-size: 24px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}