/* ===========================================================
   Base.html 专用样式文件
   包含基础页面布局和通用样式
   ========================================================= */

/* ===========================================================
   1. CSS变量定义
   ========================================================= */

:root {
    /* 主题色彩 */
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #43e97b;
    --info-color: #38f9d7;
    --warning-color: #f093fb;
    --danger-color: #f093fb;
    
    /* 基础色彩 */
    --light-color: #f8f9fa;
    --dark-color: #2c3e50;
    --white-color: #ffffff;
    --gray-color: #6c757d;
    --gray-light-color: #e9ecef;
    --gray-dark-color: #495057;
    
    /* 字体系统 */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-heading: var(--font-family-base);
    --font-size-base: 1rem;
    --line-height-base: 1.5;
    
    /* 边框圆角 */
    --border-radius: 0.375rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 0.75rem;
    
    /* 阴影效果 */
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --box-shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --box-shadow-xl: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    /* 过渡效果 */
    --transition-base: all 0.15s ease-in-out;
    --transition-fast: all 0.1s ease-in-out;
    --transition-slow: all 0.3s ease-in-out;
    
    /* 间距系统 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
}

/* ===========================================================
   2. 基础页面样式
   ========================================================= */

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--dark-color);
    background-color: var(--white-color);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 为固定导航栏留出空间 */
body {
    padding-top: 6px;
}

/* 确保所有断点下的一致性 */
@media (max-width: 991.98px) {
    body {
        padding-top: 6px;
    }
}

/* ===========================================================
   3. 容器和布局
   ========================================================= */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

@media (min-width: 576px) {
    .container {
        max-width: 540px;
    }
}

@media (min-width: 768px) {
    .container {
        max-width: 720px;
    }
}

@media (min-width: 992px) {
    .container {
        max-width: 960px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}

@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
}

/* ===========================================================
   4. 页脚样式
   ========================================================= */

footer {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-top: 1px solid rgba(102, 126, 234, 0.1);
    margin-top: auto;
    position: relative;
    z-index: 10;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-base);
    font-weight: 500;
}

footer a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

footer a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

/* ===========================================================
   5. 搜索弹窗样式
   ========================================================= */

.fullscreen-search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    
    /* 确保在所有设备上都能正常工作 */
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

.fullscreen-search-overlay.show {
    display: flex !important;
    opacity: 1;
    visibility: visible;
}

.fullscreen-search-content {
    width: 90%;
    max-width: 600px;
    text-align: center;
    color: var(--white-color);
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.fullscreen-search-overlay.show .fullscreen-search-content {
    transform: translateY(0);
}

.close-btn {
    position: absolute;
    top: -60px;
    right: 0;
    background: none;
    border: none;
    color: var(--white-color);
    font-size: 2rem;
    cursor: pointer;
    padding: 10px;
    border-radius: 50%;
    transition: var(--transition-base);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(90deg);
}

.search-input-group {
    position: relative;
    margin: 2rem 0;
}

.search-input-group i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-color);
    font-size: 1.2rem;
    z-index: 2;
}

.search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    font-size: 1.1rem;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-xl);
    background: rgba(255, 255, 255, 0.1);
    color: var(--white-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-base);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

.search-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin: 1.5rem 0;
}

.search-suggestion-tag {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    color: var(--white-color);
    cursor: pointer;
    transition: var(--transition-base);
    font-size: 0.9rem;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.search-suggestion-tag:hover {
    background: rgba(102, 126, 234, 0.3);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.search-suggestion-tag:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.search-tip {
    opacity: 0.8;
    font-size: 0.9rem;
}

/* ===========================================================
   6. 响应式设计
   ========================================================= */

@media (max-width: 767.98px) {
    .fullscreen-search-content {
        width: 95%;
        padding: 0 1rem;
    }
    
    .search-input {
        font-size: 1rem;
        padding: 0.875rem 0.875rem 0.875rem 2.5rem;
    }
    
    .search-input-group i {
        left: 15px;
        font-size: 1rem;
    }
    
    .search-suggestions {
        gap: 0.375rem;
    }
    
    .search-suggestion-tag {
        padding: 0.375rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .close-btn {
        top: -50px;
        right: 10px;
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }
}

@media (max-width: 575.98px) {
    body {
        padding-top: 60px;
    }
    
    .container {
        padding: 0 10px;
    }
    
    .search-suggestions {
        flex-direction: column;
        align-items: center;
    }
    
    .search-suggestion-tag {
        width: 100%;
        max-width: 200px;
        text-align: center;
    }
}

/* ===========================================================
   7. 动画效果
   ========================================================= */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

/* ===========================================================
   8. 无障碍支持
   ========================================================= */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --secondary-color: #800080;
        --dark-color: #000000;
        --white-color: #ffffff;
    }
}

/* ===========================================================
   9. 打印样式
   ========================================================= */

@media print {
    body {
        padding-top: 0;
        background: white;
        color: black;
    }
    
    .navbar-modern,
    .fullscreen-search-overlay,
    .close-btn {
        display: none !important;
    }
    
    footer {
        background: none;
        border-top: 1px solid #ccc;
        color: #666;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
}

/* ===========================================================
   10. 工具类
   ========================================================= */

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.shadow-custom {
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.border-gradient {
    border: 2px solid;
    border-image: linear-gradient(135deg, var(--primary-color), var(--secondary-color)) 1;
}

.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ===========================================================
   10. 导航栏组件
   ========================================================= */

/* 极简导航栏样式 */
.navbar,
.navbar-modern,
.custom-navbar {
    background: var(--white-color) !important;
    border: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    padding: 0.75rem 0 !important;
    z-index: 20;
}

.navbar-brand,
.navbar-brand-modern {
    margin-left: 0 !important;
    padding-left: var(--spacing-sm) !important;
    padding-right: 1.2rem !important;
    font-size: 1.5rem !important;
    font-weight: 700 !important;
    color: var(--primary-color) !important;
    background: none !important;
    display: flex !important;
    align-items: center !important;
    gap: var(--spacing-sm) !important;
    min-width: 120px !important;
    flex-shrink: 0 !important;
}

/* 波浪分割线 */
.navbar-wave {
    position: relative;
    width: 100%;
    height: 32px;
    margin: 0;
    z-index: 10;
    background: transparent;
    pointer-events: none;
    line-height: 0;
}

.navbar-wave svg {
    display: block;
    width: 100%;
    height: 32px;
    pointer-events: none;
}

.navbar-wave path {
    fill: var(--white-color);
}