/* 
 * 重庆护理职业学院学习助手——四季学习中心
 * 现代简约风格 - 黑白灰色系
 */

/* 基础样式与变量 */
:root {
    /* 主色调 - 黑白灰 */
    --color-white: #ffffff;
    --color-light: #f8f9fa;
    --color-gray-100: #f1f3f5;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    --color-black: #000000;
    
    /* 四季主题色 */
    --color-accent: #1a5f7a;        /* 春 - 深蓝绿 */
    --color-accent-light: #2a8bb5;  /* 夏 - 明亮蓝 */
    --color-spring: #4caf50;        /* 春 - 绿色 */
    --color-summer: #ff9800;        /* 夏 - 橙色 */
    --color-autumn: #795548;        /* 秋 - 棕色 */
    --color-winter: #2196f3;        /* 冬 - 蓝色 */
    
    /* 字体 */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-secondary: 'Montserrat', sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* 边框半径 */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* 过渡动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 通用样式 */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-family: var(--font-secondary);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-gray-600);
    font-weight: 400;
}

/* 按钮样式 */
.btn-primary, .btn-secondary, .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--color-gray-800);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-black);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-500);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-black);
    border: 1px solid var(--color-gray-400);
}

.btn-outline:hover {
    border-color: var(--color-black);
    background-color: var(--color-gray-100);
}

/* 导航栏已删除，保留 logo 样式供其他地方使用 */
.logo {
    font-family: var(--font-secondary);
    font-weight: 600;
    text-decoration: none;
    letter-spacing: -0.3px;
}

.logo-dot {
    color: var(--color-accent);
}

/* 英雄区样式 — 优化版（去除了顶部导航） */
.hero {
    position: relative;
    width: 100%;
    height: 100vh;           /* 桌面端铺满整个视口高度 */
    min-height: 480px;       /* 适当降低最小高度 */
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* 全屏背景图层 — 更自然的缩放比例 */
.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('hero-image.jpg');
    background-size: contain;        /* 改为 contain，避免拉伸模糊 */
    background-position: center center;
    background-repeat: no-repeat;
    background-color: #f8f9fa;       /* 背景底色，填充边缘空白 */
    transition: transform 0.5s ease-out;
}

/* 遮罩 — 更轻薄，展示更多图片细节 */
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.15) 0%,
        rgba(0, 0, 0, 0.08) 20%,
        rgba(0, 0, 0, 0.04) 40%,
        rgba(0, 0, 0, 0.1) 100%
    );
    z-index: 1;
}

/* 网站徽章（替换原来的导航栏 logo） */
.site-badge {
    margin-bottom: 2rem;
    animation: fadeIn 0.6s ease-out 0.2s both;
}

.site-badge .logo {
    font-family: var(--font-secondary);
    font-size: 1.4rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    text-decoration: none;
    letter-spacing: -0.3px;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(8px);
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    display: inline-block;
}

.site-badge .logo-dot {
    color: var(--color-accent-light);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 内容容器 */
.hero-inner {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    padding-top: 4rem;               /* 减少顶部边距 */
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.hero-content {
    max-width: 640px;
    animation: slideUp 0.7s ease-out 0.3s both;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-family: var(--font-secondary);
    font-size: 2.8rem;              /* 适当减小标题尺寸 */
    font-weight: 700;
    color: #ffffff;
    line-height: 1.18;
    margin-bottom: 1.25rem;         /* 精心控制间距 */
    letter-spacing: -0.45px;
    text-shadow: 0 3px 16px rgba(0, 0, 0, 0.6);
    animation-delay: 0.1s;
}

.title-line {
    display: block;
}

.title-line:first-child {
    font-size: 1.1em;
}

.title-line:last-child {
    font-size: 0.9em;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.92);
    margin-top: 0.35em;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.82);
    margin-bottom: 2.5rem;
    line-height: 1.75;
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.4);
    font-weight: 400;
    animation-delay: 0.2s;
}

.highlight {
    color: #ffffff;
    font-weight: 600;
    position: relative;
    display: inline-block;
    transition: all 0.25s ease;
}

.highlight:hover {
    color: var(--color-accent-light);
    transform: translateY(-1px);
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-accent-light);
    opacity: 0.7;
    z-index: -1;
    transition: all 0.3s ease;
}

.highlight:hover::after {
    opacity: 0.9;
    height: 3px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: 2rem;
    animation-delay: 0.3s;
}

/* 全屏模式下按钮颜色微调，确保在深色背景上好看 */
.hero .btn-secondary {
    border-color: rgba(255, 255, 255, 0.6);
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(4px);
}

.hero .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.25);
    border-color: #ffffff;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s infinite;
}

.scroll-indicator a {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.scroll-indicator a:hover {
    color: #ffffff;
}

.scroll-indicator i {
    font-size: 1.5rem;
    margin-top: 0.5rem;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* 关于部分样式 */
.about {
    background-color: var(--color-white);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.about-text p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-700);
    font-size: 1.1rem;
    line-height: 1.7;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-gray-200);
}

.stat h3 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: var(--spacing-xs);
}

.stat p {
    color: var(--color-gray-600);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.about-skills h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: var(--spacing-md);
}

.skills-list {
    list-style: none;
}

.skills-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-gray-700);
    border-bottom: 1px solid var(--color-gray-200);
    position: relative;
    padding-left: 1.5rem;
}

.skills-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

.skills-list li:last-child {
    border-bottom: none;
}

/* 作品展示样式 */
.work {
    background-color: var(--color-light);
}

.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* 四季卡片特殊样式 */
.work-card:nth-child(1) .placeholder-work {
    color: var(--color-spring);
}

.work-card:nth-child(2) .placeholder-work {
    color: var(--color-summer);
}

.work-card:nth-child(3) .placeholder-work {
    color: var(--color-autumn);
}

.work-card:nth-child(4) .placeholder-work {
    color: var(--color-winter);
}

.work-card:nth-child(1) .work-tags span {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--color-spring);
}

.work-card:nth-child(2) .work-tags span {
    background-color: rgba(255, 152, 0, 0.1);
    color: var(--color-summer);
}

.work-card:nth-child(3) .work-tags span {
    background-color: rgba(121, 85, 72, 0.1);
    color: var(--color-autumn);
}

.work-card:nth-child(4) .work-tags span {
    background-color: rgba(33, 150, 243, 0.1);
    color: var(--color-winter);
}

.work-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.work-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.work-image {
    height: 200px;
    background: linear-gradient(45deg, var(--color-gray-100), var(--color-gray-200));
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-work {
    font-size: 4rem;
    color: var(--color-gray-400);
}

.work-content {
    padding: var(--spacing-lg);
}

.work-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.work-content p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.work-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.work-tags span {
    background-color: var(--color-gray-100);
    color: var(--color-gray-700);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* 页脚样式 */
.footer {
    background-color: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-gray-800);
}

.footer-info h3 {
    font-family: var(--font-secondary);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.footer-info p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-500);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-gray-800);
    color: var(--color-gray-400);
    border-radius: 50%;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-3px);
}

.footer-contact h4,
.footer-newsletter h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer-contact ul {
    list-style: none;
}

.footer-contact li {
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-contact i {
    color: var(--color-accent);
    width: 20px;
}

.footer-newsletter p {
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-md);
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-xs);
}

.newsletter-form input {
    flex: 1;
    padding: 0.75rem 1rem;
    background-color: var(--color-gray-800);
    border: 1px solid var(--color-gray-700);
    border-radius: var(--border-radius-md);
    color: var(--color-white);
    font-family: var(--font-primary);
    font-size: 0.9rem;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.newsletter-form button {
    padding: 0.75rem 1.5rem;
    background-color: var(--color-accent);
    color: var(--color-white);
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.newsletter-form button:hover {
    background-color: var(--color-accent-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    color: var(--color-gray-600);
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.4rem;
    }
    
    .hero-subtitle {
        font-size: 1.05rem;
    }
    
    .hero-inner {
        padding: 0 var(--spacing-lg);
        padding-top: 5rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .section-title {
        font-size: 1.8rem;
    }
    
    /* 手机端 hero：高度改为 100svh，支持动态视口（隐藏地址栏时也铺满） */
    .hero {
        height: 100svh;
        height: 100vh; /* 降级 */
        min-height: 400px;
    }
    
    .hero-bg {
        background-position: center center;
        background-size: cover;      /* 小屏时用 cover 确保填满 */
    }
    
    /* 手机端文字居中 */
    .hero-inner {
        justify-content: center;
        text-align: center;
        padding: 0 var(--spacing-md);
        padding-top: 2.5rem;
    }
    
    .site-badge {
        margin-bottom: 1.5rem;
    }
    
    .site-badge .logo {
        font-size: 1.1rem;
        padding: 0.5rem 1rem;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-title {
        font-size: 1.8rem;
        line-height: 1.3;
        margin-bottom: 0.9rem;
    }
    
    .hero-subtitle {
        font-size: 0.92rem;
        margin-bottom: 1.8rem;
        line-height: 1.7;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
        margin-top: 1.2rem;
    }
    
    .hero-actions .btn-primary,
    .hero-actions .btn-secondary {
        width: 100%;
        max-width: 220px;
        padding: 0.8rem 1.2rem;
        font-size: 0.92rem;
    }
    
    /* 移动端遮罩更轻薄 */
    .hero-overlay {
        background: linear-gradient(
            to bottom,
            rgba(0, 0, 0, 0.12) 0%,
            rgba(0, 0, 0, 0.06) 40%,
            rgba(0, 0, 0, 0.09) 100%
        );
    }
    
    .work-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .hero {
        min-height: 380px;
    }
    
    .hero-bg {
        background-position: center center;
        background-size: cover;
    }
    
    .hero-inner {
        padding: 0 var(--spacing-sm);
        padding-top: 2rem;
    }
    
    .site-badge .logo {
        font-size: 1rem;
        padding: 0.45rem 0.9rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
        letter-spacing: -0.2px;
        margin-bottom: 0.75rem;
    }
    
    .hero-subtitle {
        font-size: 0.85rem;
        margin-bottom: 1.5rem;
        line-height: 1.65;
    }
    
    .hero-actions .btn-primary,
    .hero-actions .btn-secondary {
        max-width: 200px;
        padding: 0.75rem 1rem;
        font-size: 0.85rem;
    }
    
    .work-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --color-white: #121212;
        --color-light: #1e1e1e;
        --color-gray-100: #2d2d2d;
        --color-gray-200: #3d3d3d;
        --color-gray-300: #4d4d4d;
        --color-gray-400: #5d5d5d;
        --color-gray-500: #6d6d6d;
        --color-gray-600: #8d8d8d;
        --color-gray-700: #adadad;
        --color-gray-800: #cdcdcd;
        --color-gray-900: #ededed;
        --color-black: #ffffff;
    }
}