/* ========================================
   Echo English Studio - Styles
   精美英文工作室宣传网页样式
======================================== */

/* CSS 变量定义 */
:root {
    /* 主色调 - 优雅的蓝绿色系 */
    --primary-color: #2C7A7B;
    --primary-light: #38B2AC;
    --primary-dark: #234E52;
    --primary-gradient: linear-gradient(135deg, #2C7A7B 0%, #38B2AC 100%);

    /* 辅助色 */
    --accent-color: #ED8936;
    --accent-light: #F6AD55;
    --secondary-color: #667EEA;

    /* 中性色 */
    --text-dark: #1A202C;
    --text-medium: #4A5568;
    --text-light: #718096;
    --text-muted: #A0AEC0;

    /* 背景色 */
    --bg-white: #FFFFFF;
    --bg-light: #F7FAFC;
    --bg-cream: #FFFBF5;
    --bg-dark: #1A202C;

    /* 边框和阴影 */
    --border-light: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1), 0 6px 10px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.12), 0 10px 20px rgba(0, 0, 0, 0.08);

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-normal);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(44, 122, 123, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(44, 122, 123, 0.45);
}

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

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

.btn-primary-full {
    width: 100%;
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 16px 32px;
    font-size: 16px;
    box-shadow: 0 4px 15px rgba(44, 122, 123, 0.35);
}

.btn-primary-full:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(44, 122, 123, 0.45);
}

.btn-outline-full {
    width: 100%;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 14px 32px;
    font-size: 16px;
}

.btn-outline-full:hover {
    background: var(--primary-color);
    color: white;
}

/* ========================================
   导航栏
======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text {
    font-family: 'Playfair Display', serif;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-subtitle {
    font-size: 12px;
    color: var(--text-light);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-medium);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: var(--transition-normal);
}

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

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

.nav-cta {
    padding: 10px 24px;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 2px 10px rgba(44, 122, 123, 0.3);
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(44, 122, 123, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition-fast);
}

/* ========================================
   英雄区域
======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 24px 60px;
    background: linear-gradient(135deg, #F0FFF4 0%, #E6FFFA 50%, #FFF5F5 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.floating-shapes {
    position: absolute;
    inset: 0;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.5;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, rgba(44, 122, 123, 0.1) 0%, rgba(56, 178, 172, 0.05) 100%);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.1) 0%, rgba(246, 173, 85, 0.05) 100%);
    bottom: -50px;
    left: -50px;
    animation-delay: -5s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 165, 234, 0.05) 100%);
    top: 50%;
    left: 30%;
    animation-delay: -10s;
}

.shape-4 {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, rgba(44, 122, 123, 0.15) 0%, rgba(56, 178, 172, 0.08) 100%);
    bottom: 30%;
    right: 20%;
    animation-delay: -15s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(20px, -20px) rotate(5deg); }
    50% { transform: translate(-10px, 20px) rotate(-5deg); }
    75% { transform: translate(-20px, -10px) rotate(3deg); }
}

.hero-content {
    flex: 1;
    max-width: 600px;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.15) 0%, rgba(246, 173, 85, 0.1) 100%);
    color: var(--accent-color);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 24px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(237, 137, 54, 0.2); }
    50% { box-shadow: 0 0 0 10px rgba(237, 137, 54, 0); }
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

.title-line {
    display: block;
}

.title-line.highlight {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-medium);
    margin-bottom: 32px;
    letter-spacing: 1px;
}

.hero-slogan {
    font-size: 17px;
    font-weight: 500;
    color: var(--accent-color);
    margin-bottom: 20px;
    padding: 14px 24px;
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.12) 0%, rgba(246, 173, 85, 0.06) 100%);
    border-radius: var(--radius-full);
    display: inline-block;
    border: 1px solid rgba(237, 137, 54, 0.2);
}

.hero-slogan i {
    font-size: 12px;
    opacity: 0.5;
    margin: 0 6px;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 40px;
}

.feature-tag {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: white;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-medium);
    box-shadow: var(--shadow-sm);
}

.feature-tag i {
    color: var(--primary-color);
}

.hero-cta {
    display: flex;
    gap: 16px;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

.visual-card {
    position: relative;
    width: 340px;
    height: 360px;
}

.card-glow {
    position: absolute;
    inset: -20px;
    background: var(--primary-gradient);
    border-radius: 50%;
    opacity: 0.15;
    filter: blur(40px);
    animation: glow 3s infinite ease-in-out;
}

@keyframes glow {
    0%, 100% { opacity: 0.15; transform: scale(1); }
    50% { opacity: 0.25; transform: scale(1.05); }
}

.card-content {
    position: relative;
    width: 100%;
    height: 100%;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.stat-item {
    text-align: center;
    margin-bottom: 20px;
}

.stat-item:last-child {
    margin-bottom: 0;
}

.stat-number {
    font-family: 'Playfair Display', serif;
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-suffix {
    font-family: 'Playfair Display', serif;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-icon {
    display: block;
    margin-bottom: 8px;
}

.stat-icon i {
    font-size: 36px;
    color: var(--primary-color);
}

.stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-light);
    margin-top: 4px;
    line-height: 1.4;
    white-space: nowrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    animation: bounce 2s infinite;
}

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

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-light);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-light);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

.scroll-indicator span {
    font-size: 12px;
    color: var(--text-light);
}

/* ========================================
   通用区块样式
======================================== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-gradient);
    color: white;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: 42px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.section-desc {
    font-size: 18px;
    color: var(--text-light);
}

/* ========================================
   关于老师
======================================== */
.about-section {
    padding: 120px 0;
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 80px;
    align-items: center;
}

.about-image {
    position: relative;
}

.image-frame {
    position: relative;
    width: 100%;
    aspect-ratio: 3/4;
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-cream) 100%);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(44, 122, 123, 0.1) 0%, rgba(56, 178, 172, 0.05) 100%);
}

.image-placeholder i {
    font-size: 120px;
    color: var(--primary-color);
    opacity: 0.3;
}

.image-decoration {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background: var(--primary-gradient);
    border-radius: 50%;
    opacity: 0.2;
}

.credential-badges {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
}

.credential-badges .badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: white;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-dark);
    box-shadow: var(--shadow-lg);
}

.credential-badges .badge i {
    color: var(--primary-color);
}

.about-info {
    padding: 20px 0;
}

.teacher-name h3 {
    font-family: 'Playfair Display', serif;
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.teacher-title {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, rgba(44, 122, 123, 0.1) 0%, rgba(56, 178, 172, 0.05) 100%);
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 32px;
}

.credentials-list {
    display: grid;
    gap: 20px;
    margin-bottom: 32px;
}

.credential-item {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
}

.credential-item:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.credential-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.credential-icon i {
    font-size: 20px;
    color: white;
}

.credential-text h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.credential-text p {
    font-size: 14px;
    color: var(--text-light);
}

.teaching-philosophy {
    padding: 24px;
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.08) 0%, rgba(246, 173, 85, 0.04) 100%);
    border-radius: var(--radius-md);
    margin-bottom: 32px;
    border-left: 4px solid var(--accent-color);
}

.teaching-philosophy h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.teaching-philosophy h4 i {
    color: var(--accent-color);
}

.teaching-philosophy p {
    font-size: 15px;
    color: var(--text-medium);
    line-height: 1.8;
}

.highlight-text {
    color: var(--primary-color);
    font-weight: 600;
}

.philosophy-highlight {
    font-size: 17px;
    font-weight: 600;
    color: var(--accent-color);
    line-height: 1.8;
    margin-bottom: 12px;
    padding: 12px 16px;
    background: rgba(237, 137, 54, 0.1);
    border-radius: var(--radius-sm);
}

.philosophy-highlight i {
    font-size: 12px;
    opacity: 0.6;
    margin: 0 8px;
}

/* ========================================
   课程体系
======================================== */
.courses-section {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-white) 100%);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.course-card {
    position: relative;
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: var(--transition-normal);
}

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

.course-card:hover::before {
    opacity: 1;
}

.course-card.featured {
    background: linear-gradient(135deg, #2C7A7B 0%, #38B2AC 100%);
    color: white;
}

.course-card.featured::before {
    background: var(--accent-color);
    opacity: 1;
}

.course-card.featured .course-title,
.course-card.featured .course-target .target-label,
.course-card.featured .course-target .target-text,
.course-card.featured .course-desc,
.course-card.featured .course-features .feature,
.course-card.featured .course-link {
    color: white;
}

.course-card.featured .course-icon {
    background: rgba(255, 255, 255, 0.2);
}

.course-card.featured .course-features .feature {
    background: rgba(255, 255, 255, 0.15);
}

.course-card.featured .course-link i {
    color: white;
}

.course-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: var(--bg-light);
    color: var(--text-medium);
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.course-badge.hot {
    background: linear-gradient(135deg, #F56565 0%, #FC8181 100%);
    color: white;
}

.course-badge.new {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-light) 100%);
    color: white;
}

.course-card.featured .course-badge {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.course-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, rgba(44, 122, 123, 0.1) 0%, rgba(56, 178, 172, 0.05) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.course-icon i {
    font-size: 28px;
    color: var(--primary-color);
}

.course-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.course-target {
    margin-bottom: 16px;
}

.target-label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.target-text {
    font-size: 13px;
    color: var(--text-medium);
    font-weight: 500;
}

.course-desc {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.7;
    margin-bottom: 20px;
}

.course-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.course-features .feature {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: var(--bg-light);
    border-radius: var(--radius-full);
    font-size: 12px;
    color: var(--text-medium);
}

.course-features .feature i {
    color: var(--accent-color);
    font-size: 10px;
}

.course-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
}

.course-link i {
    transition: var(--transition-fast);
}

.course-link:hover i {
    transform: translateX(4px);
}

/* ========================================
   收费标准
======================================== */
.pricing-section {
    padding: 120px 0;
    background: var(--bg-white);
}

.pricing-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 32px;
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.1) 0%, rgba(246, 173, 85, 0.05) 100%);
    border-radius: var(--radius-full);
    margin-bottom: 48px;
}

.pricing-note i {
    font-size: 20px;
    color: var(--accent-color);
}

.pricing-note span {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-medium);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.pricing-card {
    position: relative;
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-light);
    transition: var(--transition-normal);
}

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

.pricing-card.popular {
    border-color: var(--primary-color);
    background: linear-gradient(180deg, rgba(44, 122, 123, 0.03) 0%, white 100%);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 20px;
    background: var(--primary-gradient);
    color: white;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.pricing-card.vip {
    background: linear-gradient(180deg, rgba(237, 137, 54, 0.05) 0%, white 100%);
    border-color: var(--accent-color);
}

.vip-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 20px;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-light) 100%);
    color: white;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.pricing-header {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-light);
}

.pricing-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.pricing-desc {
    font-size: 13px;
    color: var(--text-light);
}

.pricing-body {
    text-align: center;
    margin-bottom: 24px;
}

.price-original {
    margin-bottom: 16px;
}

.price-original .label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.price-original .amount {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-light);
    text-decoration: line-through;
}

.price-original .unit {
    font-size: 13px;
    color: var(--text-muted);
}

.price-special {
    padding: 16px;
    background: linear-gradient(135deg, rgba(44, 122, 123, 0.08) 0%, rgba(56, 178, 172, 0.04) 100%);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
}

.price-special .label {
    display: block;
    font-size: 12px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 4px;
}

.price-special .amount {
    font-family: 'Playfair Display', serif;
    font-size: 42px;
    font-weight: 700;
    color: var(--primary-color);
}

.price-special .unit {
    font-size: 14px;
    color: var(--text-medium);
}

.price-save {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, rgba(237, 137, 54, 0.15) 0%, rgba(246, 173, 85, 0.1) 100%);
    color: var(--accent-color);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-full);
}

/* ========================================
   联系我们
======================================== */
.contact-section {
    padding: 120px 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 50%, var(--primary-light) 100%);
    position: relative;
    overflow: hidden;
}

.contact-section::before {
    content: '';
    position: absolute;
    inset: 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='0.05'%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");
}

.section-header.light .section-tag {
    background: rgba(255, 255, 255, 0.2);
}

.section-header.light .section-title {
    color: white;
}

.section-header.light .section-desc {
    color: rgba(255, 255, 255, 0.8);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-card {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: var(--transition-normal);
}

.contact-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(8px);
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 24px;
    color: white;
}

.contact-details h4 {
    font-size: 16px;
    font-weight: 600;
    color: white;
    margin-bottom: 8px;
}

.contact-details p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 4px;
}

.contact-details .phone-number {
    font-family: 'Playfair Display', serif;
    font-size: 24px;
    font-weight: 700;
    color: white;
}

.contact-details .contact-note {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.7);
}

.qr-code-placeholder {
    margin-top: 20px;
}

.qr-box {
    background: white;
    border-radius: var(--radius-md);
    padding: 32px;
    text-align: center;
}

.qr-box i {
    font-size: 80px;
    color: var(--primary-color);
    opacity: 0.3;
    margin-bottom: 16px;
}

.qr-box p {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.qr-box span {
    font-size: 12px;
    color: var(--text-light);
}

.contact-form-wrapper {
    background: white;
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-xl);
}

.form-header {
    margin-bottom: 32px;
}

.form-header h3 {
    font-family: 'Playfair Display', serif;
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-header p {
    font-size: 15px;
    color: var(--text-light);
}

.contact-form {
    display: grid;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 18px;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    color: var(--text-dark);
    transition: var(--transition-fast);
    background: var(--bg-light);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 4px rgba(44, 122, 123, 0.1);
}

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

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%234A5568' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* 复选框和单选框样式 */
.checkbox-group,
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
}

.checkbox-item,
.radio-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-light);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 14px;
    color: var(--text-medium);
    transition: var(--transition-fast);
    user-select: none;
}

.checkbox-item:hover,
.radio-item:hover {
    border-color: var(--primary-light);
    background: rgba(44, 122, 123, 0.05);
}

.checkbox-item input[type="checkbox"],
.radio-item input[type="radio"] {
    display: none;
}

.checkbox-item .checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-light);
    border-radius: 4px;
    position: relative;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.checkbox-item input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-item input[type="checkbox"]:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 2px;
    width: 5px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.radio-item .radio-mark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-light);
    border-radius: 50%;
    position: relative;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.radio-item input[type="radio"]:checked + .radio-mark {
    border-color: var(--primary-color);
}

.radio-item input[type="radio"]:checked + .radio-mark::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
}

.checkbox-item:has(input:checked),
.radio-item:has(input:checked) {
    background: rgba(44, 122, 123, 0.1);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 兼容不支持 :has 的浏览器 */
.checkbox-item.checked,
.radio-item.checked {
    background: rgba(44, 122, 123, 0.1);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* ========================================
   页脚
======================================== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 80px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand .footer-logo {
    margin-bottom: 16px;
}

.footer-brand .logo-text {
    color: white;
}

.footer-brand .logo-subtitle {
    color: rgba(255, 255, 255, 0.6);
}

.footer-brand > p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 24px;
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 8px;
}

.footer-contact i {
    color: var(--primary-light);
    width: 16px;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: white;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
}

.footer-col ul a:hover {
    color: var(--primary-light);
    padding-left: 4px;
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

/* ========================================
   返回顶部
======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.back-to-top i {
    font-size: 18px;
}

/* ========================================
   响应式设计
======================================== */
@media (max-width: 1200px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 992px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 100px 24px 80px;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-features {
        justify-content: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-visual {
        margin-top: 60px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .about-image {
        max-width: 350px;
        margin: 0 auto;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links,
    .nav-cta {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero-title {
        font-size: 36px;
    }

    .section-title {
        font-size: 32px;
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .visual-card {
        width: 280px;
        height: 280px;
    }

    .stat-number {
        font-size: 36px;
    }

    .scroll-indicator {
        display: none;
    }

    .contact-form-wrapper {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .feature-tag {
        font-size: 13px;
        padding: 8px 16px;
    }

    .section-title {
        font-size: 26px;
    }

    .teacher-name h3 {
        font-size: 28px;
    }

    .credential-badges {
        flex-direction: column;
        align-items: center;
    }

    .credential-badges .badge {
        width: 100%;
        justify-content: center;
    }
}

/* ========================================
   动画效果
======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 滚动显示动画 */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}