/* 基础变量定义 */
:root {
    /* 主色调 */
    --primary: #4A90E2;
    --primary-dark: #3a7bc8;
    --primary-light: #e8f2fc;
    --secondary: #6C5CE7;
    --secondary-dark: #5649c0;
    
    /* 文字色 */
    --text: #2D3436;
    --text-light: #FFFFFF;
    --text-muted: #636e72;
    --text-on-primary: #FFFFFF;
    
    /* 背景色 */
    --bg: #f5f7fa;
    --bg-dark: #2c3e50;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --bg-gradient-dark: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    
    /* 卡片 */
    --card-bg: rgba(255, 255, 255, 0.95);
    --card-bg-dark: rgba(0, 0, 0, 0.3);
    --card-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    --card-shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* 玻璃效果 */
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-bg-dark: rgba(0, 0, 0, 0.2);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* 夜间模式 */
[data-theme="dark"] {
    --primary: #4A90E2;
    --secondary: #6C5CE7;
    --text: #ECF0F1;
    --text-muted: #b2bec3;
    --bg: var(--bg-dark);
    --bg-gradient: var(--bg-gradient-dark);
    --card-bg: var(--card-bg-dark);
    --card-shadow: var(--card-shadow-dark);
    --glass-bg: var(--glass-bg-dark);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    background: var(--bg-gradient);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    transition: var(--transition);
    -webkit-font-smoothing: antialiased;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

p {
    margin-bottom: var(--space-md);
}

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

a:hover {
    color: var(--primary-dark);
}

/* 轮播图 */
.carousel {
    height: 40vh;
    max-height: 400px;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    overflow: hidden;
    position: relative;
    box-shadow: var(--card-shadow);
}

.carousel img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.carousel img.active {
    opacity: 1;
}

/* 通知栏 */
.notification-container {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-md);
    margin: var(--space-xl) auto;
    padding: var(--space-lg);
    width: 90%;
    max-width: 1200px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--glass-bg);
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.notification-icon {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    border-radius: 50%;
}

.notification-content {
    flex: 1;
}

.notification-text {
    color: var(--primary);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
    display: block;
}

.notification-texts {
    color: var(--text);
    line-height: 1.6;
}

/* 搜索区域 */
.search-container {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    margin: var(--space-xl) auto;
    width: 90%;
    max-width: 800px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--glass-bg);
    text-align: center;
}

.search-title {
    margin-bottom: var(--space-sm);
    color: var(--text);
}

.search-engine-select {
    background: var(--glass-bg);
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    color: var(--text);
    margin-bottom: var(--space-lg);
    width: 100%;
    max-width: 200px;
    transition: var(--transition);
    font-size: 1rem;
    cursor: pointer;
}

.search-engine-select:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.search-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    width: 100%;
}

#searchInput {
    background: var(--glass-bg);
    border: none;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 500px;
    color: var(--text);
    transition: var(--transition);
    font-size: 1rem;
    flex: 1;
}

#searchInput:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.3);
}

#search-button {
    background: var(--primary);
    color: var(--text-on-primary);
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: var(--radius-xl);
    transition: var(--transition);
    cursor: pointer;
    font-weight: 600;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

#search-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* 功能模块 */
.modules-container {
    width: 90%;
    max-width: 1200px;
    margin: var(--space-xl) auto;
}

.section-title {
    color: var(--text);
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: var(--space-lg);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary);
    margin: var(--space-sm) auto 0;
    border-radius: 3px;
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.module {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    min-height: 120px;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    border: 1px solid var(--glass-bg);
    color: var(--text);
    font-size: 1.2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    padding: var(--space-lg);
    cursor: pointer;
}

.module::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: 0.5s;
}

.module:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(31, 38, 135, 0.2);
}

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

.module-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
    color: var(--primary);
}

/* 文章区域 */
.articles-container {
    width: 90%;
    max-width: 1200px;
    margin: var(--space-xl) auto;
}

.articles-iframe {
    width: 100%;
    height: 600px;
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--card-shadow);
    background: var(--card-bg);
}

/* 底部导航 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: 0 10%;
    box-shadow: 0 -8px 32px rgba(31, 38, 135, 0.1);
    border: 1px solid var(--glass-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

.nav-button {
    background: transparent;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-muted);
    padding: var(--space-sm);
    flex: 1;
}

.nav-button:hover {
    color: var(--primary);
    transform: translateY(-3px);
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-text {
    font-size: 0.8rem;
    font-weight: 500;
}

/* 更新模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--card-shadow);
    text-align: center;
    transform: translateY(20px);
    transition: var(--transition);
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-title {
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.modal-text {
    color: var(--text);
    margin-bottom: var(--space-xl);
}

.modal-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

.modal-button {
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    min-width: 120px;
}

.modal-button.primary {
    background: var(--primary);
    color: var(--text-on-primary);
}

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

.modal-button.secondary {
    background: var(--glass-bg);
    color: var(--text);
}

.modal-button.secondary:hover {
    background: var(--glass-bg);
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .carousel {
        height: 30vh;
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    }
    
    .notification-container,
    .search-container {
        width: 95%;
        padding: var(--space-md);
    }
    
    .search-group {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    #searchInput,
    #search-button {
        width: 100%;
        max-width: 100%;
    }
    
    .bottom-nav {
        height: 70px;
        padding: 0 5%;
    }
    
    .nav-icon {
        font-size: 1.3rem;
    }
    
    .nav-text {
        display: none;
    }
    
    .modules-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    
    .articles-iframe {
        height: 400px;
    }
}

/* 实用类 */
.text-center {
    text-align: center;
}

.mb-0 {
    margin-bottom: 0 !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}
/* 中考倒计时样式 */
/* 中考倒计时样式 - 精美版 */
.countdown-container {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    border-radius: 16px;
    padding: 20px;
    margin: 25px auto;
    max-width: 800px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    color: white;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.countdown-container::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%);
    transform: rotate(30deg);
    animation: shine 6s infinite linear;
}

@keyframes shine {
    0% { transform: translateX(-100%) rotate(30deg); }
    100% { transform: translateX(100%) rotate(30deg); }
}

.countdown-content {
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
}

.countdown-icon {
    font-size: 32px;
    margin-right: 20px;
    color: #fff;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.countdown-text {
    flex: 1;
}

.countdown-title {
    font-weight: 600;
    font-size: 18px;
    margin-bottom: 10px;
    display: block;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.countdown-timer {
    display: flex;
    justify-content: space-between;
    margin-top: 15px;
}

.countdown-timer span {
    display: inline-block;
    min-width: 60px;
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    padding: 10px 5px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    backdrop-filter: blur(5px);
    margin: 0 5px;
    position: relative;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.countdown-timer span:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.25);
}

.countdown-timer span::after {
    content: attr(data-label);
    position: absolute;
    bottom: -20px;
    left: 0;
    width: 100%;
    font-size: 12px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
}

/* 响应式调整 */
@media (max-width: 600px) {
    .countdown-timer {
        flex-wrap: wrap;
    }
    
    .countdown-timer span {
        min-width: calc(50% - 20px);
        margin-bottom: 30px;
    }
    
    .countdown-content {
        flex-direction: column;
        text-align: center;
    }
    
    .countdown-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
}