/* 商业化iOS风格蔚蓝色白色主题 */
:root {
    /* 蔚蓝色系配色 */
    --primary-blue: #0066CC;
    --primary-light: #4A90E2;
    --primary-dark: #0052A3;
    --accent-blue: #E6F2FF;
    --sky-blue: #F0F8FF;
    --ocean-blue: #1E3A8A;
    
    /* 中性色 */
    --white: #FFFFFF;
    --light-gray: #F8FAFC;
    --medium-gray: #F1F5F9;
    --border-gray: #E2E8F0;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    
    /* 功能色 */
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #06B6D4;
    
    /* 阴影系统 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 102, 204, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 102, 204, 0.1), 0 2px 4px -1px rgba(0, 102, 204, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 102, 204, 0.1), 0 4px 6px -2px rgba(0, 102, 204, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 102, 204, 0.1), 0 10px 10px -5px rgba(0, 102, 204, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 102, 204, 0.25);
    
    /* 圆角系统 */
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    
    /* 间距系统 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    
    /* 动画 */
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Roboto, Arial, sans-serif;
    background: linear-gradient(135deg, var(--sky-blue) 0%, var(--accent-blue) 50%, var(--white) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 布局系统 */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-6);
    position: relative;
}

.row {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--space-6);
    align-items: start;
}

.col-1 { grid-column: span 1; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

/* 头部样式 - 商业化设计 */
.header {
    background: var(--white);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    padding: var(--space-6) var(--space-8);
    margin-bottom: var(--space-8);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-light));
}

.logo {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav {
    display: flex;
    gap: var(--space-3);
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-xl);
    transition: var(--transition);
    font-weight: 500;
    font-size: 15px;
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.nav-link span {
    position: relative;
    z-index: 1;
}

.nav-link:hover {
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.nav-link:hover::before {
    opacity: 1;
}

.nav-link.active {
    color: var(--white);
}

.nav-link.active::before {
    opacity: 1;
}

/* 按钮系统 - 商业化设计 */
.btn {
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-xl);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    cursor: pointer;
    transition: var(--transition);
    font-size: 15px;
    position: relative;
    overflow: hidden;
    text-transform: none;
    letter-spacing: 0.25px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #DC2626);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-gray);
}

.btn-outline:hover {
    background: var(--light-gray);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

/* 卡片系统 - 商业化设计 */
.card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(226, 232, 240, 0.8);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-gray);
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* 表单系统 - 商业化设计 */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    font-size: 15px;
}

.form-control {
    width: 100%;
    padding: var(--space-4) var(--space-5);
    border: 2px solid var(--border-gray);
    border-radius: var(--radius-lg);
    font-size: 16px;
    transition: var(--transition);
    background: var(--white);
    color: var(--text-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-control:hover {
    border-color: var(--primary-light);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

/* 警告框系统 */
.alert {
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    border: 1px solid transparent;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
    color: var(--success);
    border-color: rgba(16, 185, 129, 0.3);
}

.alert-danger {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.05));
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.3);
}

.alert-warning {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
    color: var(--warning);
    border-color: rgba(245, 158, 11, 0.3);
}

/* 表格系统 */
.table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table th,
.table td {
    padding: var(--space-4) var(--space-6);
    text-align: left;
    border-bottom: 1px solid var(--border-gray);
}

.table th {
    background: linear-gradient(135deg, var(--accent-blue), var(--sky-blue));
    font-weight: 600;
    color: var(--ocean-blue);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table tr:hover {
    background: var(--light-gray);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* 分页系统 */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-8);
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid var(--border-gray);
    background: var(--white);
    color: var(--text-secondary);
}

.pagination a:hover {
    background: var(--primary-blue);
    color: var(--white);
    border-color: var(--primary-blue);
    transform: translateY(-2px);
}

.pagination .active {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
    color: var(--white);
    border-color: transparent;
}

/* 日记卡片特殊样式 */
.diary-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-gray);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.diary-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.diary-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-2xl);
}

.diary-card:hover::before {
    opacity: 1;
}

.diary-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-gray);
}

.diary-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.3;
}

.diary-meta {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-4);
    font-size: 14px;
    color: var(--text-secondary);
}

.diary-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    background: var(--light-gray);
    border-radius: var(--radius);
    font-weight: 500;
}

.diary-content {
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: var(--space-6);
    font-size: 16px;
}

.diary-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.diary-actions .btn {
    padding: var(--space-2) var(--space-4);
    font-size: 14px;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0, 102, 204, 0.2);
    border-radius: 50%;
    border-top-color: var(--primary-blue);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: var(--space-4);
    }
    
    .row {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .col-1, .col-2, .col-3, .col-4, .col-5, .col-6,
    .col-7, .col-8, .col-9, .col-10, .col-11, .col-12 {
        grid-column: span 12;
    }
    
    .header {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .logo {
        font-size: 24px;
    }
    
    .card {
        padding: var(--space-6);
    }
    
    .btn {
        padding: var(--space-4) var(--space-5);
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--space-3);
    }
    
    .diary-card {
        padding: var(--space-5);
    }
    
    .diary-actions {
        flex-direction: column;
    }
    
    .diary-actions .btn {
        width: 100%;
        justify-content: center;
    }
}

/* 特殊元素样式 */
.search-box {
    position: relative;
    margin-bottom: var(--space-6);
}

.search-box input {
    padding-left: var(--space-12);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'%3E%3C/circle%3E%3Cpath d='m21 21-4.35-4.35'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: var(--space-4) center;
    background-size: 20px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.stat-card {
    background: var(--white);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-gray);
    text-align: center;
    transition: var(--transition);
}

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

.stat-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-gray);
    border-radius: var(--radius);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(var(--primary-blue), var(--primary-light));
    border-radius: var(--radius);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-blue);
}

/* ============================
   认证页面样式
   ============================ */
.auth-bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.bg-circle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.1), rgba(74, 144, 226, 0.1));
    animation: float 6s ease-in-out infinite;
}

.bg-circle-1 {
    width: 300px;
    height: 300px;
    top: -150px;
    left: -150px;
    animation-delay: 0s;
}

.bg-circle-2 {
    width: 200px;
    height: 200px;
    top: 50%;
    right: -100px;
    animation-delay: 2s;
}

.bg-circle-3 {
    width: 150px;
    height: 150px;
    bottom: -75px;
    left: 30%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    position: relative;
}

.auth-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--space-10);
    box-shadow: var(--shadow-2xl);
    border: 1px solid rgba(255, 255, 255, 0.8);
    max-width: 450px;
    width: 100%;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-light));
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.auth-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-4);
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 32px;
    box-shadow: var(--shadow-lg);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.auth-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    letter-spacing: -0.5px;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
}

.auth-form {
    margin-bottom: var(--space-8);
}

.auth-btn {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: 16px;
    font-weight: 600;
    margin-top: var(--space-6);
    position: relative;
    overflow: hidden;
}

.auth-footer {
    text-align: center;
    margin-bottom: var(--space-8);
}

.auth-footer p {
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
    font-size: 15px;
}

.auth-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.auth-link:hover {
    background: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.auth-features {
    display: flex;
    justify-content: space-around;
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-gray);
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
}

.feature-item i {
    width: 40px;
    height: 40px;
    background: var(--light-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-size: 16px;
    transition: var(--transition);
}

.feature-item:hover i {
    background: var(--primary-blue);
    color: var(--white);
    transform: scale(1.1);
}

.auth-decoration {
    display: none;
    flex: 1;
    max-width: 500px;
    margin-left: var(--space-10);
}

.decoration-content {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
    border-radius: var(--radius-2xl);
    padding: var(--space-10);
    color: var(--white);
    text-align: center;
    box-shadow: var(--shadow-2xl);
}

.decoration-content h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: var(--space-4);
    letter-spacing: -1px;
}

.decoration-content p {
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: var(--space-8);
    opacity: 0.9;
}

.decoration-stats {
    display: flex;
    justify-content: space-around;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: 14px;
    opacity: 0.8;
}

/* 响应式设计 - 认证页面 */
@media (min-width: 1200px) {
    .auth-container {
        justify-content: flex-start;
        align-items: center;
        gap: var(--space-10);
    }
    
    .auth-decoration {
        display: block;
    }
}

@media (max-width: 480px) {
    .auth-card {
        padding: var(--space-6);
        margin: var(--space-4);
    }
    
    .auth-logo {
        width: 60px;
        height: 60px;
        font-size: 24px;
    }
    
    .auth-title {
        font-size: 24px;
    }
    
    .auth-features {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    .feature-item {
        flex-direction: row;
        justify-content: center;
    }
}