/* ========== 全局样式 ========== */
:root {
    --primary: #6c5ce7;
    --primary-dark: #5a4bd1;
    --secondary: #fd79a8;
    --success: #00b894;
    --warning: #fdcb6e;
    --danger: #e17055;
    --dark: #2d3436;
    --gray: #636e72;
    --light-gray: #dfe6e9;
    --bg: #f5f6fa;
    --white: #ffffff;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
    --radius: 12px;
    --transition: all 0.3s ease;
}

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

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

a {
    text-decoration: none;
    color: var(--primary);
}

/* ========== 导航栏 ========== */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 0 2rem;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.navbar .brand span {
    color: var(--secondary);
}

.navbar .nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.navbar .nav-links a {
    color: var(--gray);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

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

.navbar .nav-links .vip-badge {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* ========== 用户菜单 ========== */
.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
}

.user-menu .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--light-gray);
    cursor: pointer;
}

.user-menu .points-display {
    background: linear-gradient(135deg, #ffecd2, #fcb69f);
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #e17055;
}

.user-menu .dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-hover);
    min-width: 180px;
    padding: 0.5rem 0;
    display: none;
    margin-top: 0.5rem;
}

.user-menu .dropdown.show {
    display: block;
}

.user-menu .dropdown a {
    display: block;
    padding: 0.5rem 1.2rem;
    color: var(--dark);
    transition: var(--transition);
}

.user-menu .dropdown a:hover {
    background: var(--bg);
    color: var(--primary);
}

/* ========== 内容卡片 ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.content-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.content-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}

.content-card .card-header {
    padding: 1rem 1.2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid var(--light-gray);
}

.content-card .card-header .badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    background: var(--light-gray);
    color: var(--gray);
}

.content-card .card-header .badge.free {
    background: var(--success);
    color: white;
}

.content-card .card-header .badge.vip {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
}

.content-card .card-body {
    padding: 1rem 1.2rem;
}

.content-card .card-body h3 {
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.content-card .card-body .meta {
    font-size: 0.85rem;
    color: var(--gray);
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.content-card .card-footer {
    padding: 0.8rem 1.2rem;
    background: var(--bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--gray);
}

.content-card .card-footer .lock-icon {
    color: var(--secondary);
}

/* ========== 内容详情页 ========== */
.content-detail {
    background: var(--white);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.content-detail .content-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.content-detail .content-meta {
    display: flex;
    gap: 2rem;
    font-size: 0.9rem;
    color: var(--gray);
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--light-gray);
    margin-bottom: 1.5rem;
}

.content-detail .content-body {
    font-size: 1rem;
    line-height: 1.8;
}

.content-detail .content-body img {
    max-width: 100%;
    border-radius: 8px;
}

/* 付费遮罩 */
.paywall {
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    margin: 2rem 0;
}

.paywall .lock-icon {
    font-size: 3rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

.paywall h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.paywall p {
    color: var(--gray);
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 0.6rem 1.8rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
}

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

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

.btn-secondary {
    background: var(--light-gray);
    color: var(--dark);
}

.btn-secondary:hover {
    background: #b2bec3;
}

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

.btn-success:hover {
    background: #00a381;
}

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

.btn-gradient {
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: white;
}

.btn-gradient:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

/* ========== 登录/注册表单 ========== */
.auth-container {
    max-width: 400px;
    margin: 4rem auto;
    background: var(--white);
    border-radius: var(--radius);
    padding: 2.5rem;
    box-shadow: var(--shadow);
}

.auth-container .auth-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.auth-container .auth-subtitle {
    text-align: center;
    color: var(--gray);
    margin-bottom: 2rem;
}

.auth-container .form-group {
    margin-bottom: 1.2rem;
}

.auth-container .form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
}

.auth-container .form-group input {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 2px solid var(--light-gray);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

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

.auth-container .btn {
    width: 100%;
    padding: 0.8rem;
    font-size: 1rem;
}

.auth-container .auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--gray);
}

/* ========== VIP中心 ========== */
.vip-dashboard {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

.vip-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.vip-card .vip-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 1rem 0;
}

.vip-card .stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--bg);
    border-radius: 8px;
}

.vip-card .stat-item .number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.vip-card .stat-item .label {
    font-size: 0.8rem;
    color: var(--gray);
}

.checkin-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
}

.checkin-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .navbar {
        padding: 0 1rem;
    }
    .navbar .nav-links a {
        font-size: 0.85rem;
    }
    .content-grid {
        grid-template-columns: 1fr;
    }
    .vip-dashboard {
        grid-template-columns: 1fr;
    }
    .content-detail {
        padding: 1rem;
    }
    .vip-card .vip-stats {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .navbar .brand {
        font-size: 1.2rem;
    }
    .navbar .nav-links {
        gap: 0.8rem;
    }
    .auth-container {
        margin: 2rem 1rem;
        padding: 1.5rem;
    }
}