/* 紫廷书院 - 新中式风格样式 */

/* ========== 基础变量 ========== */
:root {
    /* 主色调 - 墨绿色系 */
    --color-primary: #2d5a4a;
    --color-primary-dark: #1e3d30;
    --color-primary-light: #3d7a5f;
    
    /* 辅助色 - 金色系 */
    --color-gold: #b8860b;
    --color-gold-light: #d4a017;
    --color-gold-dark: #9a7209;
    
    /* 背景色 - 米白色系 */
    --color-bg: #faf8f5;
    --color-bg-alt: #f5f0e8;
    --color-bg-dark: #2a2520;
    
    /* 文字色 */
    --color-text: #333333;
    --color-text-light: #666666;
    --color-text-muted: #999999;
    --color-text-inverse: #ffffff;
    
    /* 边框色 */
    --color-border: #e0d8c8;
    --color-border-light: #ebe5d9;
    
    /* 字体 */
    --font-serif: 'Noto Serif SC', 'STSong', 'SimSun', serif;
    --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* 过渡 */
    --transition: all 0.3s ease;
}

/* ========== 重置样式 ========== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ========== 容器 ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========== 按钮样式 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-outline-light {
    background-color: transparent;
    color: var(--color-text-inverse);
    border-color: var(--color-text-inverse);
}

.btn-outline-light:hover {
    background-color: var(--color-text-inverse);
    color: var(--color-primary);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(250, 248, 245, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border-light);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 2rem;
    color: var(--color-primary);
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary-dark);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--color-text);
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-gold);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition);
}

/* ========== 首页横幅 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(45, 90, 74, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(184, 134, 11, 0.1) 0%, transparent 50%);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(45, 90, 74, 0.05) 0%, transparent 70%);
    z-index: -1;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--spacing-xl);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 4rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    display: block;
    font-family: var(--font-sans);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-gold);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.25em;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-light);
}

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

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

.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-text-muted);
    border-bottom: 2px solid var(--color-text-muted);
    transform: rotate(45deg);
}

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

/* ========== 通用区块样式 ========== */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-alt {
    background-color: var(--color-bg-alt);
}

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

.section-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-gold);
    letter-spacing: 0.25em;
}

/* ========== 核心理念 ========== */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.philosophy-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--color-border-light);
}

.philosophy-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-gold);
}

.philosophy-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.philosophy-card h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.philosophy-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========== 课程分级 ========== */
.levels-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.level-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    border: 2px solid var(--color-border);
    transition: var(--transition);
    position: relative;
}

.level-card.featured {
    border-color: var(--color-gold);
    box-shadow: var(--shadow-md);
}

.level-card.featured::before {
    content: '推荐';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-gold);
    color: var(--color-text-inverse);
    padding: 0.25rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.level-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.level-badge.beginner {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.level-badge.intermediate {
    background-color: #fff3e0;
    color: #e65100;
}

.level-badge.advanced {
    background-color: #fce4ec;
    color: #c2185b;
}

.level-card h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.level-price {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-gold);
    margin-bottom: var(--spacing-md);
}

.level-price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-muted);
}

.level-features {
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.level-features li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--color-text-light);
}

.level-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.level-target {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.courses-cta {
    text-align: center;
}

/* ========== 特色优势 ========== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.advantage-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.advantage-number {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-border);
    line-height: 1;
    margin-bottom: var(--spacing-md);
}

.advantage-item h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.advantage-item p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========== 学员心声 ========== */
.testimonials-slider {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.testimonial-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border-light);
}

.testimonial-content {
    margin-bottom: var(--spacing-lg);
}

.testimonial-content p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text);
    font-style: italic;
}

.testimonial-content p::before {
    content: '"';
    font-size: 1.5rem;
    color: var(--color-gold);
    margin-right: 0.25rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 1.25rem;
}

.author-info strong {
    display: block;
    color: var(--color-primary-dark);
}

.author-info span {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ========== 行动号召 ========== */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    padding: var(--spacing-xxl) 0;
}

.cta-content {
    text-align: center;
}

.cta-content h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xl);
}

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

/* ========== 页脚 ========== */
.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-inverse);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand .logo {
    margin-bottom: var(--spacing-md);
}

.footer-brand .logo-text {
    color: var(--color-text-inverse);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-gold);
}

.footer-links ul li {
    margin-bottom: 0.5rem;
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links ul li a:hover {
    color: var(--color-text-inverse);
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.5rem;
}

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

.social-link {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-inverse);
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--color-gold);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .philosophy-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .levels-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto var(--spacing-xl);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .testimonials-slider {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-wrap: wrap;
    }
    
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-md) 0;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-cta {
        display: none;
        width: 100%;
        padding-bottom: var(--spacing-md);
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-features {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .philosophy-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
}

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

.philosophy-card,
.level-card,
.advantage-item,
.testimonial-card {
    animation: fadeInUp 0.6s ease forwards;
}

.philosophy-card:nth-child(1) { animation-delay: 0.1s; }
.philosophy-card:nth-child(2) { animation-delay: 0.2s; }
.philosophy-card:nth-child(3) { animation-delay: 0.3s; }
.philosophy-card:nth-child(4) { animation-delay: 0.4s; }

.level-card:nth-child(1) { animation-delay: 0.2s; }
.level-card:nth-child(2) { animation-delay: 0.3s; }
.level-card:nth-child(3) { animation-delay: 0.4s; }

.advantage-item:nth-child(1) { animation-delay: 0.1s; }
.advantage-item:nth-child(2) { animation-delay: 0.2s; }
.advantage-item:nth-child(3) { animation-delay: 0.3s; }
.advantage-item:nth-child(4) { animation-delay: 0.4s; }

.testimonial-card:nth-child(1) { animation-delay: 0.2s; }
.testimonial-card:nth-child(2) { animation-delay: 0.3s; }
.testimonial-card:nth-child(3) { animation-delay: 0.4s; }