/* ========== 基础样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    background: #f9f9f9;
    color: #333;
    padding: 0 1rem;
}

header {
    background: #fff;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 1.5rem;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

nav a {
    margin-right: 1rem;
    text-decoration: none;
    color: #0077cc;
    font-weight: 500;
}

nav a:hover {
    text-decoration: underline;
}

main {
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

h2 {
    margin-bottom: 1rem;
    border-left: 4px solid #0077cc;
    padding-left: 0.75rem;
}

.content {
    font-size: 1.1rem;
}

.locked {
    background: #fef5e7;
    padding: 1rem;
    border-left: 4px solid #e67e22;
    border-radius: 4px;
    text-align: center;
}

.login-form {
    max-width: 400px;
}

form label {
    display: block;
    margin: 0.5rem 0 0.2rem;
    font-weight: 500;
}

form input, form textarea, form button {
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

form button {
    background: #0077cc;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
}

form button:hover {
    background: #005fa3;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

th, td {
    border: 1px solid #ddd;
    padding: 0.5rem;
    text-align: left;
}

th {
    background: #f2f2f2;
}

.success {
    background: #d4edda;
    color: #155724;
    padding: 0.5rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.error {
    background: #f8d7da;
    color: #721c24;
    padding: 0.5rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding: 1rem;
    color: #777;
}

/* ========== 文章内容样式 ========== */
.article-block {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border-radius: 12px;
    background: #ffffff;
    border: 1px solid #e0e0e0;
    transition: all 0.3s ease;
}

.article-title {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #333;
    border-left: 4px solid #0077cc;
    padding-left: 0.75rem;
}

.content-preview,
.content-full {
    line-height: 1.8;
    font-size: 1.05rem;
}

.locked-preview {
    background: #fef5e7;
    padding: 1.5rem;
    border-left: 4px solid #e67e22;
    border-radius: 8px;
    text-align: center;
    color: #856404;
}

.locked-preview .hint {
    font-size: 0.85rem;
    color: #999;
    margin-top: 0.5rem;
}

.locked-message {
    background: #fef5e7;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    margin-top: 1rem;
}

.time-notice {
    font-size: 0.8rem;
    color: #999;
    text-align: right;
    margin-top: 1rem;
    padding-top: 0.5rem;
    border-top: 1px dashed #eee;
}

.unlock-time {
    color: #e67e22;
    font-weight: bold;
}

/* ========== 会员卡片样式 ========== */
.member-info {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    animation: fadeIn 0.5s ease;
}

.member-level {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
}

.area-cards {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: 1rem;
}

.area-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    transition: transform 0.2s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    border: 1px solid #eee;
    animation: fadeInUp 0.5s ease;
}

.area-card:hover {
    transform: translateX(5px);
}

.area-card.disabled {
    opacity: 0.5;
    filter: grayscale(0.3);
    cursor: not-allowed;
}

.area-card.disabled:hover {
    transform: none;
}

.card-header {
    flex: 0 0 80px;
    padding: 0.6rem;
    text-align: center;
    border-radius: 10px 0 0 10px;
}

.card-header.primary { background: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%); }
.card-header.middle { background: linear-gradient(135deg, #fad0c4 0%, #ffd1ff 100%); }
.card-header.senior { background: linear-gradient(135deg, #f6d5f7 0%, #fbe9d7 100%); }

.card-header h3 {
    margin: 0;
    font-size: 0.9rem;
    font-weight: bold;
}

.card-header .level-badge {
    display: inline-block;
    margin-top: 0.2rem;
    padding: 2px 6px;
    border-radius: 12px;
    font-size: 0.6rem;
    background: rgba(0,0,0,0.1);
}

.card-body {
    flex: 1;
    padding: 0.6rem;
    text-align: left;
    color: #666;
    font-size: 0.75rem;
}

.lock-icon {
    font-size: 1rem;
    margin-right: 0.3rem;
    display: inline-block;
}

.required-level {
    font-size: 0.65rem;
    color: #999;
    margin-top: 0.2rem;
}

/* ========== 动画 ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ========== 手机端适配（统一优化） ========== */
@media (max-width: 768px) {
    body {
        padding: 0 0.5rem;
    }
    
    main {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    nav a {
        display: inline-block;
        margin-bottom: 0.5rem;
    }
    
    /* 文章内容 - 取消段落间距 */
    .content-preview,
    .content-full,
    .article-block .content-preview,
    .article-block .content-full {
        line-height: 1.4 !important;
        margin: 0 !important;
    }
    
    .content-preview p,
    .content-full p,
    .article-block p {
        margin: 0 !important;
        padding: 0 !important;
        line-height: 1.4 !important;
    }
    
    /* 段落之间用换行分隔，不加额外间距 */
    .content-preview p + p,
    .content-full p + p {
        margin-top: 0 !important;
    }
    
    /* 标题 */
    .article-title {
        font-size: 1.3rem !important;
        margin-bottom: 0.5rem !important;
    }
    
    /* 文章块内边距 */
    .article-block {
        padding: 1rem !important;
    }
    
    /* 锁定提示框 */
    .locked-preview,
    .locked-message {
        padding: 0.8rem !important;
        margin: 0.5rem 0 !important;
        font-size: 0.85rem;
    }
    
    /* 时间提示 */
    .time-notice {
        font-size: 0.7rem !important;
        margin-top: 0.5rem !important;
    }
    
    /* 会员信息卡片 */
    .member-info {
        padding: 0.8rem !important;
    }
    
    .member-info p {
        margin: 0.2rem 0 !important;
        font-size: 0.85rem;
    }
    
    /* 会员卡片 - 手机端 */
    .card-header {
        flex: 0 0 70px;
        padding: 0.5rem;
    }
    
    .card-header h3 {
        font-size: 0.8rem;
    }
    
    .card-body {
        font-size: 0.7rem;
        padding: 0.5rem;
    }
    
    /* 登录表单 */
    .login-form {
        padding: 1rem !important;
        margin: 0 0.5rem;
    }
    
    .login-form h2 {
        font-size: 1.3rem;
        margin-bottom: 1rem;
    }
    
    .login-form input,
    .login-form button {
        padding: 0.7rem !important;
        font-size: 0.9rem !important;
    }
    
    .login-form label {
        font-size: 0.85rem;
    }
    
    /* 表格手机端适配 */
    table, thead, tbody, th, td, tr {
        display: block;
    }
    
    tr {
        margin-bottom: 1rem;
        border: 1px solid #ddd;
        padding: 0.5rem;
    }
}

/* ========== 登录表单专用样式 ========== */
.login-form form {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.login-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.login-form input:focus {
    outline: none;
    border-color: #0077cc;
    box-shadow: 0 0 0 2px rgba(0,119,204,0.1);
}