/* ========================================
   Altrove Piano Tuition 风格网页 - CSS 样式表
   ======================================== */

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

:root {
    /* 配色方案 - 经典蓝金 (Classic Blue & Gold)
       灵感：悉尼港的深蓝、邦迪海滩的阳光、桉树林的自然色调 */
    --color-primary: #2C5F7C;       /* 悉尼港深蓝 - 专业、可信赖 */
    --color-primary-dark: #1E4559;  /* 深海蓝 */
    --color-primary-light: #4A8BA3; /* 浅海蓝绿 */
    --color-secondary: #1A1A1A;     /* 炭黑色 - 优雅 */
    --color-accent: #C9A962;        /* 澳洲金黄 - 温暖、高品质 */
    --color-accent-light: #E0C085;  /* 浅金色 */

    --color-white: #ffffff;         /* 纯白 - 钢琴白键 */
    --color-cream: #f9f8f4;         /* 象牙白 - 温暖背景 */
    --color-light-gray: #f0ede6;    /* 暖灰 - 音乐厅墙面 */
    --color-medium-gray: #8b867e;   /* 中性灰 */
    --color-dark-gray: #2a2a2a;     /* 深灰 */

    --color-sand: #e6e0d4;          /* 沙色 */
    --color-brass: #b5a642;         /* 黄铜色 - 钢琴弦轴 */

    --color-text: #2d2d2d;          /* 深色文字 - 清晰易读 */
    --color-text-light: #6b6b6b;    /* 浅灰文字 */
    --color-border: #e0ddd5;        /* 浅色边框 */

    /* 字体 */
    --font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* 字号 */
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 2rem;      /* 32px */
    --font-size-4xl: 2.5rem;    /* 40px */
    --font-size-5xl: 3rem;      /* 48px */

    /* 间距 */
    --spacing-xs: 0.5rem;       /* 8px */
    --spacing-sm: 1rem;         /* 16px */
    --spacing-md: 1.5rem;       /* 24px */
    --spacing-lg: 2rem;         /* 32px */
    --spacing-xl: 3rem;         /* 48px */
    --spacing-2xl: 4rem;        /* 64px */
    --spacing-3xl: 6rem;        /* 96px */

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* 阴影 - 柔和自然 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);

    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* 现代简约主题 (Modern Minimalist) */
[data-theme="modern"] {
    --color-primary: #1a365d;       /* 深邃海军蓝 */
    --color-primary-dark: #0f2744;  /* 深蓝 */
    --color-primary-light: #2c5282; /* 浅蓝 */
    --color-secondary: #2d3748;     /* 深灰蓝 */
    --color-accent: #dd6b20;        /* 活力橙 */
    --color-accent-light: #ed8936;  /* 浅橙 */

    --color-white: #ffffff;         /* 纯白 */
    --color-cream: #f7fafc;         /* 极浅灰蓝 */
    --color-light-gray: #edf2f7;    /* 浅灰 */
    --color-medium-gray: #a0aec0;   /* 中灰 */
    --color-dark-gray: #1a202c;     /* 深灰 */

    --color-sand: #e2e8f0;          /* 浅灰 */
    --color-eucalyptus: #38a169;    /* 清新绿 */

    --color-text: #2d3748;          /* 深灰蓝文字 */
    --color-text-light: #718096;    /* 浅灰文字 */
    --color-border: #e2e8f0;        /* 浅灰边框 */
}

/* 温暖木质主题 (Warm Wood) */
[data-theme="warm"] {
    --color-primary: #5d4037;       /* 深棕色 */
    --color-primary-dark: #3e2723;  /* 深棕 */
    --color-primary-light: #8d6e63; /* 浅棕 */
    --color-secondary: #3e2723;     /* 深咖啡 */
    --color-accent: #d84315;        /* 砖红 */
    --color-accent-light: #ff7043;  /* 浅橙红 */

    --color-white: #fffaf5;         /* 暖白 */
    --color-cream: #fff3e0;         /* 米黄 */
    --color-light-gray: #efebe9;    /* 暖浅灰 */
    --color-medium-gray: #a1887f;   /* 暖中灰 */
    --color-dark-gray: #3e2723;     /* 深咖啡 */

    --color-sand: #d7ccc8;          /* 沙色 */
    --color-eucalyptus: #66bb6a;    /* 草绿 */

    --color-text: #4e342e;          /* 深棕文字 */
    --color-text-light: #8d6e63;    /* 浅棕文字 */
    --color-border: #d7ccc8;        /* 米色边框 */
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 通用工具类 ==================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-header:has(.section-title) {
    margin-bottom: var(--spacing-xl);
}

.section-header:has(.section-subtitle) {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

.section-subtitle:only-child {
    margin-bottom: var(--spacing-2xl);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-secondary:hover {
    background-color: var(--color-accent);
    color: var(--color-primary);
}

.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-accent);
}

.btn-full {
    width: 100%;
    text-align: center;
}

/* ==================== 导航栏 ==================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    height: 70px;
    z-index: 1001;
}

.header-container .logo {
    flex-shrink: 0;
}

.header-container .desktop-nav {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.header-container .lang-switcher {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.header-container .theme-switcher {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.logo {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    object-fit: contain;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

/* 语言切换器 - 下拉菜单 */
.lang-dropdown {
    position: relative;
    margin-right: var(--spacing-sm);
}

.lang-dropdown .dropdown-toggle {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
}

.lang-dropdown .dropdown-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.lang-dropdown .dropdown-toggle.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.lang-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 160px;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: var(--spacing-xs) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 1001;
}

.lang-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 样式切换器 - 下拉菜单 */
.theme-dropdown {
    position: relative;
    margin-right: var(--spacing-sm);
}

.theme-dropdown .dropdown-toggle {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
}

.theme-dropdown .dropdown-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.theme-dropdown .dropdown-toggle.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.theme-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 180px;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: var(--spacing-xs) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 1001;
}

.theme-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-dropdown-menu li a,
.theme-dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

/* 图标样式 */
.globe-icon,
.palette-icon {
    width: 18px;
    height: 18px;
}

.lang-dropdown-menu li a:hover,
.theme-dropdown-menu li a:hover {
    background-color: var(--color-cream);
    color: var(--color-primary);
}

/* 主题预览颜色圆点 */
.theme-preview {
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(0,0,0,0.1);
}

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

.modern-preview {
    background: linear-gradient(135deg, #1a365d 0%, #dd6b20 100%);
}

.warm-preview {
    background: linear-gradient(135deg, #5d4037 0%, #d84315 100%);
}

/* 旧的语言切换器样式 - 保留以防兼容 */
.lang-switcher {
    display: none;
}

/* 桌面导航 */
.desktop-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-item {
    position: relative;
    z-index: 50;
}

.nav-item:hover {
    z-index: 100;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-secondary);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link-text {
    display: inline-block;
}

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

.nav-link:hover,
.nav-item.active .nav-link {
    color: var(--color-primary);
}

.nav-item.active .nav-link::after,
.nav-link:hover::after {
    width: 100%;
}

/* 下拉菜单 */
.dropdown-arrow {
    font-size: var(--font-size-xs);
    color: var(--color-accent);
    transition: color 0.2s ease;
}

.nav-item:hover .dropdown-arrow {
    color: var(--color-accent);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(5px);
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    z-index: 100;
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    text-decoration: none;
    transition: background-color 0.15s ease;
    position: relative;
    z-index: 101;
}

.dropdown-menu li a:hover {
    background-color: var(--color-cream);
    color: var(--color-primary);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    margin-left: var(--spacing-sm);
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background-color: var(--color-secondary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端导航下拉菜单 - 仅移动端显示 */
.mobile-nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md);
    display: none;
    z-index: 1002;
}

.mobile-nav-dropdown.show {
    display: block;
}

/* 桌面端隐藏移动端下拉菜单和菜单按钮 */
@media (min-width: 769px) {
    .mobile-nav-dropdown {
        display: none !important;
    }

    .mobile-menu-btn {
        display: none !important;
    }
}

.mobile-dropdown-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-dropdown-menu > li {
    border-bottom: 1px solid var(--color-border);
}

.mobile-dropdown-menu > li:last-child {
    border-bottom: none;
}

.mobile-dropdown-menu > li > a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    min-height: 44px; /* 触摸目标最小尺寸 */
}

.mobile-dropdown-menu > li > a:hover {
    color: var(--color-primary);
}

/* 子菜单 */
.has-submenu {
    position: relative;
}

.submenu-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.submenu-arrow {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.submenu-arrow.open {
    transform: rotate(180deg);
}

.mobile-submenu {
    list-style: none;
    margin: 0;
    padding: 0;
    display: none;
    background-color: var(--color-cream);
    border-radius: var(--radius-sm);
}

.mobile-submenu.show {
    display: block;
}

.mobile-submenu li {
    border-bottom: none;
}

.mobile-submenu li a {
    display: block;
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border);
}

.mobile-submenu li:last-child a {
    border-bottom: none;
}

/* 移动端设置面板 */
.mobile-dropdown-settings {
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.dropdown-setting {
    padding: var(--spacing-md) 0;
}

.dropdown-setting:not(:last-child) {
    border-bottom: 1px solid var(--color-border);
}

/* 移动端按钮组 */
.mobile-btn-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.mobile-setting-btn {
    flex: 1;
    min-width: 70px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mobile-setting-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.mobile-setting-btn.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* 旧版移动端导航和切换器 - 隐藏 */
.mobile-lang-switcher,
.mobile-theme-switcher,
.mobile-nav {
    display: none;
}

/* ==================== Hero 区域 ==================== */
.hero-section {
    position: relative;
    height: 50vh;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    overflow: hidden;
}

.hero-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(212, 175, 55, 0.12) 0%, transparent 50%);
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.4;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--spacing-xl);
    max-width: 800px;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
    letter-spacing: -0.3px;
}

.hero-title .title-line {
    display: block;
}

.hero-title .title-line:first-child {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-5xl);
    color: var(--color-accent-light);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

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

.hero-scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-white);
    opacity: 0.8;
    animation: bounce 2s infinite;
}

.scroll-text {
    display: block;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    margin: 0 auto;
    border-right: 2px solid var(--color-white);
    border-bottom: 2px solid var(--color-white);
    transform: rotate(45deg);
}

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

/* ==================== 教学风采展示 ==================== */
.gallery-section {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-cream);
}

.gallery-slider {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
}

.gallery-track {
    display: flex;
    transition: transform 0.5s ease;
    width: 100%;
}

.gallery-item {
    min-width: 100%;
    position: relative;
}

.gallery-item img {
    width: 100%;
    height: 450px;
    object-fit: cover;
    display: block;
}

.gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: var(--color-white);
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-align: center;
}

.gallery-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.9);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    z-index: 10;
}

.gallery-btn:hover {
    background-color: var(--color-primary);
    color: var(--color-accent);
}

.gallery-btn svg {
    width: 24px;
    height: 24px;
}

.gallery-prev {
    left: var(--spacing-md);
}

.gallery-next {
    right: var(--spacing-md);
}

.gallery-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.gallery-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background-color: var(--color-border);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.gallery-dot.active {
    background-color: var(--color-accent);
    width: 28px;
    border-radius: var(--radius-full);
}

/* 移动端画廊优化 */
@media (max-width: 768px) {
    .gallery-item img {
        height: 280px;
    }

    .gallery-btn {
        width: 40px;
        height: 40px;
    }

    .gallery-btn svg {
        width: 20px;
        height: 20px;
    }

    .gallery-prev {
        left: var(--spacing-xs);
    }

    .gallery-next {
        right: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .gallery-item img {
        height: 220px;
    }

    .gallery-caption {
        font-size: var(--font-size-base);
        padding: var(--spacing-sm);
    }
}

/* ==================== 特色服务区域 ==================== */
.features-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-accent);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.feature-desc {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    line-height: 1.7;
    letter-spacing: 0.2px;
}

/* ==================== 关于我们区域 ==================== */
.about-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-cream);
}

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

.about-content .section-title {
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.about-text {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-placeholder {
    width: 100%;
    max-width: 500px;
    aspect-ratio: 4/3;
    background-color: var(--color-medium-gray);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
}

.image-placeholder svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-sm);
    opacity: 0.5;
}

/* ==================== 课程介绍区域 ==================== */
.courses-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.course-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

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

.course-image {
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    position: relative;
    overflow: hidden;
}

.course-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(212, 175, 55, 0.12) 0%, transparent 50%);
    pointer-events: none;
}

.course-image svg {
    width: 80px;
    height: 80px;
    opacity: 0.8;
}

.course-content {
    padding: var(--spacing-lg);
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.course-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
    word-break: break-word;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.course-desc {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    word-break: break-word;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.course-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
    padding: 0;
}

.course-features li {
    font-size: var(--font-size-sm);
    color: var(--color-text);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-sm);
    position: relative;
    word-break: break-word;
    overflow-wrap: break-word;
    word-wrap: break-word;
    max-width: 100%;
}

.course-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 700;
}

/* ==================== 统计数据区域 ==================== */
.stats-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(212, 175, 55, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
}

/* ==================== 教师团队区域 ==================== */
.teachers-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.teachers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.teacher-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.teacher-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent);
}

.teacher-avatar {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    position: relative;
    overflow: hidden;
}

.teacher-avatar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(212, 175, 55, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.teacher-avatar svg {
    width: 64px;
    height: 64px;
}

.teacher-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.teacher-role {
    font-size: var(--font-size-base);
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.teacher-desc {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ==================== 联系区域 ==================== */
.contact-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-cream);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

.contact-info h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-base);
    color: var(--color-text);
}

.info-item svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
    flex-shrink: 0;
}

/* 联系表单 */
.contact-form {
    background-color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 100%;
    overflow: hidden;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
    word-break: break-all;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background-color: var(--color-cream);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    max-width: 100%;
    overflow: hidden;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-medium-gray);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--color-white);
    box-shadow: 0 0 0 3px rgba(26, 26, 26, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ==================== 视觉展示区域 ==================== */
.showcase-section {
    width: 100%;
    background-color: var(--color-white);
    overflow: hidden;
}

.showcase-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* 视频滑块 - 多个视频并排展示 */
.showcase-video-slider {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--color-accent) rgba(0, 0, 0, 0.05);
    padding: var(--spacing-lg) var(--spacing-sm);
}

.showcase-video-slider::-webkit-scrollbar {
    height: 8px;
}

.showcase-video-slider::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-full);
}

.showcase-video-slider::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: var(--radius-full);
}

.showcase-video-slider::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent-light);
}

.video-item {
    flex: 0 0 280px;
    scroll-snap-align: center;
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.video-item video {
    width: 100%;
    aspect-ratio: 6 / 4;
    object-fit: cover;
    display: block;
    border-radius: var(--radius-md);
}

/* 视频滑块包装器 - 包含导航按钮 */
.showcase-video-slider-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) 0;
}

/* 导航按钮样式 */
.slider-nav-btn {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.slider-nav-btn:hover {
    background-color: var(--color-primary-dark);
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.slider-nav-btn:active {
    transform: scale(0.95);
}

.slider-nav-btn svg {
    width: 24px;
    height: 24px;
    stroke-width: 2;
}

/* 视频滑块容器 */
.showcase-video-slider {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    scroll-behavior: smooth;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--color-accent) rgba(0, 0, 0, 0.05);
    padding: var(--spacing-sm);
    flex: 1;
}

/* 移动端 slider 调整 */
@media (max-width: 768px) {
    .showcase-video-slider {
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
}

/* 视频项 - 桌面端显示 3 个 */
.video-item {
    flex: 0 0 calc(33.333% - var(--spacing-sm) * 2 / 3);
    scroll-snap-align: start;
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.video-item video {
    width: 100%;
    aspect-ratio: 6 / 4;
    object-fit: cover;
    display: block;
    border-radius: var(--radius-md);
}

/* 响应式视频大小 */
@media (max-width: 768px) {
    .showcase-video-slider-wrapper {
        gap: var(--spacing-xs);
        padding: var(--spacing-sm) 0;
    }

    .slider-nav-btn {
        width: 36px;
        height: 36px;
    }

    .slider-nav-btn svg {
        width: 18px;
        height: 18px;
    }

    /* 移动端显示 1 个视频，自适应屏幕宽度 */
    .video-item {
        flex: 0 0 100% !important;
    }
}

@media (max-width: 480px) {
    .slider-nav-btn {
        width: 32px;
        height: 32px;
    }

    .slider-nav-btn svg {
        width: 16px;
        height: 16px;
    }

    /* 小屏幕显示 1 个视频 */
    .video-item {
        flex: 0 0 100% !important;
    }
}

/* ==================== 页脚 ==================== */
.site-footer {
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: var(--spacing-lg) 0 var(--spacing-sm);
}

.footer-grid {
    display: grid !important;
    grid-template-columns: 2fr 1fr 1fr !important;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    text-align: left !important;
}

.footer-about,
.footer-links,
.footer-social {
    text-align: left !important;
}

.footer-about h4,
.footer-links h4,
.footer-social h4 {
    font-size: var(--font-size-base);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-white);
}

.footer-about p {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.5;
}

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

.footer-links li {
    margin-bottom: 4px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-white);
}

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

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

.social-link:hover {
    background-color: var(--color-accent);
    transform: translateY(-2px);
}

.social-link svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
    color: var(--color-white);
}

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

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

/* ==================== 响应式设计 ==================== */

/* ==================== 页面过渡动画 ==================== */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 导航栏动画 - 简化以避免卡顿 */
.site-header {
    transition: box-shadow 0.2s ease;
}

/* 按钮悬停过渡优化 */
.btn {
    transition: all 0.2s ease;
}

/* 卡片悬停过渡优化 */
.course-card,
.feature-card,
.teacher-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* 导航链接下划线动画 */
.nav-link::after {
    transition: width 0.2s ease;
}

/* 移动端菜单动画优化 */
.mobile-nav {
    transition: all 0.2s ease;
}

.mobile-nav-menu {
    transition: all 0.2s ease;
}

.mobile-nav-menu li {
    transition: all 0.15s ease;
}

.mobile-nav.active .mobile-nav-menu li:nth-child(1) { transition-delay: 0.05s; }
.mobile-nav.active .mobile-nav-menu li:nth-child(2) { transition-delay: 0.1s; }
.mobile-nav.active .mobile-nav-menu li:nth-child(3) { transition-delay: 0.15s; }
.mobile-nav.active .mobile-nav-menu li:nth-child(4) { transition-delay: 0.2s; }

/* 下拉菜单动画优化 */
.dropdown-menu {
    transition: all 0.2s ease;
    transform-origin: top center;
}

.dropdown-menu li {
    transition: all 0.15s ease;
}

.nav-item:hover .dropdown-menu li {
    opacity: 1;
    transform: translateX(0);
}

.nav-item:hover .dropdown-menu li:nth-child(1) { transition-delay: 0s; }
.nav-item:hover .dropdown-menu li:nth-child(2) { transition-delay: 0.05s; }
.nav-item:hover .dropdown-menu li:nth-child(3) { transition-delay: 0.1s; }

/* 图片过渡效果 */
.gallery-item img,
.course-image,
.teacher-avatar {
    transition: transform 0.3s ease;
}

/* 滚动动画类 - 由 JavaScript 触发 */
.scroll-animate {
    transition: opacity 0.4s ease;
}

.scroll-animate.visible {
    opacity: 1;
}

/* ==================== 平板断点 ==================== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .teachers-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* 展示区域 */
    .showcase-gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 移动端断点 */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 1.875rem;  /* 30px */
        --font-size-4xl: 1.5rem;    /* 24px */
        --font-size-3xl: 1.25rem;   /* 20px */
        --font-size-2xl: 1.0625rem; /* 17px */
        --font-size-xl: 0.9375rem;  /* 15px */
        --font-size-lg: 0.875rem;   /* 14px */
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    /* 移动端导航下拉菜单优化 */
    .mobile-nav-dropdown {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    /* 导航栏 */
    .desktop-nav,
    .header-container .desktop-nav,
    .lang-dropdown,
    .theme-dropdown,
    .nav-menu,
    .lang-switcher,
    .theme-switcher {
        display: none !important;
    }

    .mobile-menu-btn {
        display: flex !important;
    }

    .header-container {
        justify-content: space-between;
    }

    .header-container .logo {
        flex-shrink: 0;
    }

    /* Hero 区域 - 针对移动端优化 */
    .hero-section {
        height: auto;
        min-height: 65vh;
        padding: var(--spacing-2xl) 0 var(--spacing-xl);
        background-position: center;
        background-size: cover;
    }

    .hero-content {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    /* 标题优化 - 增大字体 */
    .hero-title {
        font-size: var(--font-size-4xl);
        line-height: 1.3;
        margin-bottom: var(--spacing-md);
        letter-spacing: -0.3px;
        word-wrap: break-word;
        hyphens: auto;
        text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    }

    .hero-title .title-line {
        display: block;
    }

    .hero-title .title-line:first-child {
        margin-bottom: var(--spacing-sm);
        font-size: var(--font-size-5xl);
        font-weight: 800;
    }

    /* 英文副标题优化 */
    .hero-subtitle {
        font-size: var(--font-size-lg);
        line-height: 1.7;
        margin-bottom: var(--spacing-lg);
        opacity: 0.95;
        letter-spacing: 0.2px;
        text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    }

    .hero-buttons {
        flex-direction: row;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-md);
        width: 100%;
        flex-wrap: wrap;
    }

    .hero-buttons .btn {
        width: auto;
        min-width: 140px;
        max-width: 180px;
        text-align: center;
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
        font-weight: 700;
        letter-spacing: 0.5px;
        border-radius: var(--radius-full);
    }

    .hero-scroll-indicator {
        bottom: var(--spacing-md);
        opacity: 0.8;
    }

    .scroll-text {
        font-size: var(--font-size-xs);
        margin-bottom: 6px;
        letter-spacing: 0.8px;
        text-transform: uppercase;
    }

    .scroll-arrow {
        width: 20px;
        height: 20px;
    }

    /* 特色服务 - 移动端 2 个一行（仅首页） */
    .hero-section + .features-section .features-grid,
    .showcase-section + .features-section .features-grid,
    .gallery-section + .features-section .features-grid,
    .stats-section + .features-section .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .hero-section + .features-section .feature-card,
    .showcase-section + .features-section .feature-card,
    .gallery-section + .features-section .feature-card,
    .stats-section + .features-section .feature-card {
        padding: var(--spacing-md);
    }

    /* 特色服务 - 其他页面保持 1 列 */
    .about-detail-section + .features-section .features-grid,
    .features-section:first-child .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-title {
        font-size: var(--font-size-xl);
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    .feature-desc {
        font-size: var(--font-size-base);
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    /* 教师团队 */
    .teachers-grid {
        grid-template-columns: 1fr;
    }

    /* 关于我们 */
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .about-content .section-title {
        text-align: center;
    }

    .about-text {
        line-height: 1.8;
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    /* 联系区域 */
    .contact-info {
        padding: 0 var(--spacing-sm);
    }

    .contact-info h3 {
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    .info-item {
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    .info-item span {
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    /* 课程介绍 */
    .courses-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .course-card {
        max-width: 100%;
        overflow: hidden;
    }

    .course-image {
        height: 150px;
    }

    .course-image svg {
        width: 60px;
        height: 60px;
    }

    .course-content {
        padding: var(--spacing-md);
        max-width: 100%;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    .course-title {
        font-size: var(--font-size-lg);
        word-break: break-word;
        overflow-wrap: break-word;
        word-wrap: break-word;
        max-width: 100%;
        min-height: auto;
    }

    .course-desc {
        font-size: var(--font-size-base);
        word-break: break-word;
        overflow-wrap: break-word;
        word-wrap: break-word;
        max-width: 100%;
        min-height: auto;
    }

    .course-features {
        font-size: var(--font-size-sm);
        padding: 0;
        margin: 0;
    }

    .course-features li {
        word-break: break-word;
        overflow-wrap: break-word;
        padding-left: var(--spacing-md);
    }

    /* 统计数据 */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-number {
        font-size: var(--font-size-3xl);
    }

    .stat-label {
        font-size: var(--font-size-sm);
        letter-spacing: 0.3px;
    }

    /* 联系区域 */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .contact-info {
        order: 2;
    }

    .contact-form {
        padding: var(--spacing-lg);
    }

    /* 课程卡片 */
    .courses-grid {
        grid-template-columns: 1fr;
    }

    /* 页脚 - 移动端优化 */
    .site-footer {
        padding: var(--spacing-xl) 0 var(--spacing-md) !important;
    }

    .footer-grid {
        grid-template-columns: 1fr !important;
        text-align: center !important;
        gap: var(--spacing-xl) !important;
    }

    .footer-about,
    .footer-links,
    .footer-social {
        text-align: center !important;
        padding: 0 var(--spacing-sm) !important;
    }

    .footer-about h4,
    .footer-links h4,
    .footer-social h4 {
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
        margin-bottom: var(--spacing-sm) !important;
        font-size: var(--font-size-lg) !important;
    }

    .footer-about p {
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
        line-height: 1.6 !important;
    }

    .footer-links li {
        margin-bottom: var(--spacing-xs) !important;
    }

    .footer-links a {
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
        font-size: var(--font-size-base) !important;
    }

    .social-links {
        justify-content: center !important;
        gap: var(--spacing-sm) !important;
    }

    .social-link {
        width: 40px;
        height: 40px;
    }
}

/* 小屏幕手机 */
@media (max-width: 480px) {
    :root {
        --font-size-5xl: 2rem;      /* 32px */
        --font-size-4xl: 1.75rem;   /* 28px */
        --font-size-3xl: 1.5rem;    /* 24px */
        --font-size-2xl: 1.125rem;  /* 18px */
        --font-size-xl: 1rem;       /* 16px */
        --font-size-lg: 0.9375rem;  /* 15px */
    }

    .container {
        padding: 0 var(--spacing-xs);
    }

    /* 移动端导航下拉菜单进一步优化 */
    .mobile-nav-dropdown {
        padding: var(--spacing-sm) var(--spacing-xs);
    }

    .mobile-dropdown-menu > li > a {
        padding: var(--spacing-sm) 0;
        font-size: var(--font-size-base);
    }

    .mobile-submenu li a {
        padding: var(--spacing-xs) 0;
        padding-left: var(--spacing-sm);
        font-size: var(--font-size-sm);
    }

    .container {
        padding: 0 var(--spacing-xs);
    }

    .section-title {
        font-size: var(--font-size-2xl);
        line-height: 1.3;
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    .section-subtitle {
        font-size: var(--font-size-sm);
        line-height: 1.6;
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    /* Hero 区域 - 小屏幕优化 */
    .hero-section {
        min-height: 55vh;
        padding: var(--spacing-xl) 0 var(--spacing-lg);
    }

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

    .hero-title {
        font-size: var(--font-size-3xl);
        line-height: 1.3;
        letter-spacing: -0.2px;
        word-wrap: break-word;
        hyphens: auto;
    }

    .hero-title .title-line:first-child {
        font-size: var(--font-size-4xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
        line-height: 1.6;
        letter-spacing: 0.15px;
        margin-bottom: var(--spacing-lg);
    }

    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 200px;
        font-size: var(--font-size-base);
        padding: var(--spacing-sm) var(--spacing-lg);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .stat-item {
        padding: var(--spacing-md);
        background: rgba(255, 255, 255, 0.1);
        border-radius: var(--radius-md);
    }

    .stat-number {
        font-size: var(--font-size-3xl);
        font-weight: 800;
    }

    .stat-label {
        font-size: var(--font-size-base);
        opacity: 0.9;
    }

    .stat-label {
        font-size: var(--font-size-sm);
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    /* 特色服务卡片 - 美化布局 */
    .feature-card {
        padding: var(--spacing-xl);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-md);
        border: none;
    }

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

    .feature-icon {
        width: 56px;
        height: 56px;
        margin-bottom: var(--spacing-md);
    }

    .feature-title {
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-sm);
    }

    .feature-description {
        font-size: var(--font-size-base);
        line-height: 1.7;
    }

    /* 展示区域 */
    .video-item {
        flex: 0 0 160px;
    }

    .video-item video {
        height: 240px;
    }

    /* 表单输入优化 - 防止 iOS 缩放 */
    .form-group input,
    .form-group textarea {
        font-size: 16px !important;
    }

    /* 联系表单按钮全宽显示 */
    .contact-form .btn {
        width: 100%;
    }

    /* 图片优化 */
    .gallery-item img {
        height: auto;
        max-height: 280px;
    }

    /* 视频优化 */
    .video-item {
        flex: 0 0 140px;
    }

    .video-item video {
        height: 200px;
    }

    /* 课程卡片优化 */
    .course-card {
        margin-bottom: var(--spacing-md);
    }

    .course-card:hover {
        transform: none;
    }

    /* 页脚 - 小屏幕优化 */
    .site-footer {
        padding: var(--spacing-lg) 0 var(--spacing-sm);
    }

    .footer-about p {
        font-size: var(--font-size-sm);
    }

    .footer-links a {
        font-size: var(--font-size-sm);
    }

    .social-link {
        width: 36px;
        height: 36px;
    }

    .social-link svg {
        width: 16px;
        height: 16px;
    }
}

/* ==================== 独立页面样式 ==================== */

/* 页面英雄区域 */
.page-hero {
    padding: 120px 0 var(--spacing-lg); /* 顶部 padding 避开导航栏 + 舒适间距 */
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    display: flex;
    align-items: flex-start;
    min-height: 140px;
}

.page-hero .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.page-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-white);
    text-align: center;
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
    letter-spacing: -0.2px;
}

.page-subtitle {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
    letter-spacing: 0.2px;
}

/* 关于详情页 */
.about-detail-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

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

.about-detail-image {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.about-detail-image img {
    width: 100%;
    height: 350px;
    max-width: 500px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    object-fit: cover;
    object-position: center;
}

/* 移动端图片优化 */
@media (max-width: 768px) {
    .about-detail-image img {
        height: 250px;
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .about-detail-image img {
        height: 200px;
    }

    .page-hero {
        padding: var(--spacing-md) 0;
        min-height: 80px;
    }

    .page-title {
        font-size: var(--font-size-xl);
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    .page-subtitle {
        font-size: var(--font-size-xs);
        word-break: break-all;
        overflow-wrap: break-word;
        word-wrap: break-word;
    }
}

.about-detail-heading {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    word-break: break-all;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.about-detail-text {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    word-break: break-all;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

/* About 页面按钮居中 */
.about-detail-content .btn {
    display: block;
    margin: var(--spacing-md) auto 0;
    text-align: center;
    max-width: 200px;
}

/* 教师详情页 */
.teachers-detail-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

/* 课程详情页 */
.courses-detail-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.courses-detail-section .container {
    padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
    .courses-detail-section {
        padding: var(--spacing-lg) 0;
    }

    .courses-detail-section .container {
        padding: 0 var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .courses-detail-section {
        padding: var(--spacing-md) 0;
    }

    .courses-detail-section .container {
        padding: 0 var(--spacing-xs);
    }
}

/* 联系详情页 */
.contact-detail-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-light-gray);
}

/* 页面详情响应式 */
@media (max-width: 1024px) {
    .about-detail-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .page-hero {
        padding-top: 100px; /* 移动端顶部 padding 避开导航栏 + 舒适间距 */
        padding-bottom: var(--spacing-lg);
        min-height: 140px;
        align-items: flex-start;
    }

    .page-title {
        font-size: var(--font-size-2xl);
        line-height: 1.3;
        letter-spacing: -0.2px;
        word-wrap: break-word;
        overflow-wrap: break-word;
        word-break: break-all;
        padding: 0 var(--spacing-sm);
    }

    .page-subtitle {
        font-size: var(--font-size-sm);
        line-height: 1.5;
        padding: 0 var(--spacing-sm);
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
    }

    .about-detail-grid {
        grid-template-columns: 1fr;
    }

    .about-detail-content .section-title {
        text-align: center;
    }
}

/* ========================================
   页面过渡动画 - Page Transitions
   ======================================== */

/* 页面主体淡入效果 */
body {
    animation: pageFadeIn 0.3s ease-out;
}

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

/* 导航栏加载时的稳定性 - 仅在组件加载前显示 */
#header-placeholder {
    min-height: 0;
}

#header-placeholder:not(:empty) + .page-hero,
#header-placeholder:not(:empty) + .hero-section {
    /* 组件加载后，页面内容正常显示 */
}

/* 内容区域淡入 */
.page-hero,
.hero-section,
.showcase-section,
.gallery-section,
.stats-section,
.features-section,
.about-detail-section,
.contact-detail-section,
.services-section {
    animation: contentSlideUp 0.4s ease-out 0.1s both;
}

@keyframes contentSlideUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 卡片逐个淡入效果 */
.feature-card,
.course-card {
    animation: cardFadeIn 0.5s ease-out both;
}

.feature-card:nth-child(1),
.course-card:nth-child(1) { animation-delay: 0.15s; }
.feature-card:nth-child(2),
.course-card:nth-child(2) { animation-delay: 0.25s; }
.feature-card:nth-child(3),
.course-card:nth-child(3) { animation-delay: 0.35s; }
.feature-card:nth-child(4),
.course-card:nth-child(4) { animation-delay: 0.45s; }

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

/* 导航栏加载完成前保持可见性 */
.site-header {
    opacity: 1;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

/* 导航栏占位区域 - 导航栏是 fixed 定位，不需要占位高度 */
#header-placeholder {
    min-height: 0;
}

/* 导航链接点击反馈 */
.nav-link {
    position: relative;
    transition: color 0.2s ease;
}

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