* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #10b981;
  --dark: #0f172a;
  --darker: #020614;
  --light: #f8fafc;
  --gray: #64748b;
  --card-bg: #1e293b;
  --border: #334155;
}

body {
  background-color: var(--darker);
  color: var(--light);
  line-height: 1.6;
  overflow-x: hidden;
}

header {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 999;
  border-bottom: 1px solid var(--border);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.logo i { font-size: 26px; }

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  color: var(--light);
  text-decoration: none;
  font-weight: 500;
  transition: 0.3s;
}

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

.btn {
  padding: 10px 20px;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

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

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

.hero {
  padding: 120px 0 60px;
  text-align: center;
}

.hero h1 {
  font-size: 42px;
  margin-bottom: 15px;
  background: linear-gradient(90deg, #6366f1, #10b981);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  font-size: 18px;
  color: var(--gray);
  max-width: 700px;
  margin: 0 auto 50px;
}

.generator-section {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 30px;
  max-width: 900px;
  margin: 0 auto 60px;
  border: 1px solid var(--border);
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.1);
}

.form-group {
  margin-bottom: 25px;
}

.form-group label {
  display: block;
  margin-bottom: 10px;
  font-weight: 600;
  color: var(--light);
}

textarea {
  width: 100%;
  height: 120px;
  background: var(--dark);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 15px;
  color: var(--light);
  font-size: 16px;
  resize: none;
  outline: none;
  transition: 0.3s;
}

textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.settings {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

select, input[type="text"], input[type="email"], input[type="password"], input[type="number"] {
  width: 100%;
  padding: 12px 15px;
  background: var(--dark);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--light);
  outline: none;
  transition: 0.3s;
}

select:focus, input:focus {
  border-color: var(--primary);
}

.generate-btn {
  width: 100%;
  padding: 16px;
  font-size: 18px;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border: none;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
}

.generate-btn:hover { transform: scale(1.02); }

.generate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.preview-section {
  margin-top: 30px;
  display: none;
}

.preview-title {
  margin-bottom: 15px;
  font-weight: 600;
}

.video-box {
  width: 100%;
  height: 450px;
  background: var(--dark);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border);
}

.loading {
  display: none;
  text-align: center;
  padding: 20px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 15px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.gallery { padding: 60px 0; }

.section-title {
  text-align: center;
  font-size: 28px;
  margin-bottom: 40px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
}

.gallery-item {
  background: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  transition: 0.3s;
  border: 1px solid var(--border);
}

.gallery-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(99, 102, 241, 0.15);
}

.gallery-item img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.gallery-info { padding: 15px; }
.gallery-info p { color: var(--gray); font-size: 14px; }

.features { padding: 40px 0 80px; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--card-bg);
  padding: 25px;
  border-radius: 12px;
  border: 1px solid var(--border);
  text-align: center;
}

.feature-card i {
  font-size: 36px;
  color: var(--primary);
  margin-bottom: 15px;
}

.feature-card h3 { margin-bottom: 10px; }

footer {
  background: var(--dark);
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

footer p { color: var(--gray); }

/* 登录/注册模态框 */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: 2000;
  justify-content: center;
  align-items: center;
}

.modal-overlay.active { display: flex; }

.modal-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 35px;
  width: 400px;
  max-width: 90%;
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal-card h2 {
  text-align: center;
  margin-bottom: 25px;
  color: var(--light);
}

.modal-card .form-group { margin-bottom: 18px; }

.modal-card .form-group label {
  font-size: 14px;
  margin-bottom: 6px;
}

.modal-card input {
  width: 100%;
  padding: 12px 14px;
  background: var(--dark);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--light);
  font-size: 14px;
  outline: none;
}

.modal-card input:focus { border-color: var(--primary); }

.modal-card .modal-btn {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border: none;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
  margin-top: 5px;
}

.modal-card .modal-btn:hover { transform: scale(1.02); }

.modal-card .modal-msg {
  text-align: center;
  font-size: 13px;
  margin-top: 10px;
}

.modal-card .modal-msg.error { color: #ef4444; }
.modal-card .modal-msg.success { color: #34d399; }

.modal-card .modal-switch {
  text-align: center;
  margin-top: 15px;
  color: var(--gray);
  font-size: 14px;
}

.modal-card .modal-switch a {
  color: var(--primary);
  text-decoration: none;
  cursor: pointer;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  color: var(--gray);
  font-size: 20px;
  cursor: pointer;
}

.modal-close:hover { color: var(--light); }

/* 用户信息区 */
.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 13px;
}

.user-name { font-size: 14px; color: var(--light); }

@media (max-width: 768px) {
  .hero h1 { font-size: 30px; }
  .nav-links { display: none; }
  .video-box { height: 250px; }
}