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

:root {
    --primary: #6c5ce7;
    --primary-dark: #5a4bd1;
    --secondary: #fd79a8;
    --accent: #00cec9;
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --text: #2d3436;
    --text-light: #636e72;
    --border: #dfe6e9;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* 导航栏 */
.navbar {
    background: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

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

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

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text);
    padding: 0.5rem;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: float 10s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    font-weight: 800;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: white;
    color: var(--primary);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0,0,0,0.15);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

.btn-danger {
    background: #e74c3c;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.9rem;
}

/* 功能卡片 */
.features {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--text);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.8rem;
    color: var(--text);
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 最近生成 */
.recent {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.recent h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}

.card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.card-meta {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
}

.card-desc {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-copy, .btn-share {
    padding: 0.4rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--card-bg);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.btn-copy:hover, .btn-share:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* 表单 */
.admin-form {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.admin-form label {
    font-weight: 600;
    color: var(--text);
}

.admin-form input {
    padding: 0.8rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
}

.admin-form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108,92,231,0.1);
}

/* 后台页面 */
.admin-login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: var(--radius);
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-container h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.login-form input {
    padding: 0.8rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.back-link {
    display: block;
    text-align: center;
    margin-top: 1rem;
    color: var(--text-light);
    text-decoration: none;
}

.admin-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.admin-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.admin-section h2 {
    margin-bottom: 1.5rem;
    color: var(--text);
}

/* 历史记录 */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.history-item {
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.history-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-time {
    color: var(--text-light);
    font-size: 0.9rem;
}

.history-preview {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.history-actions {
    display: flex;
    gap: 0.5rem;
}

/* 风格模板 */
.styles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.style-card {
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.style-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.style-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary);
}

/* 提示 */
.alert {
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    text-align: center;
}

.alert-error {
    background: #ffeaa7;
    color: #d63031;
}

.alert-success {
    background: #55efc4;
    color: #00b894;
}

.empty {
    text-align: center;
    color: var(--text-light);
    padding: 2rem;
}

/* 页脚 */
footer {
    background: var(--card-bg);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    margin-top: 4rem;
}

footer p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

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

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--card-bg);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: block;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero {
        padding: 4rem 1rem;
    }

    .features, .recent {
        padding: 2rem 1rem;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .login-container {
        margin: 1rem;
        padding: 2rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.6rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}