/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Modern & Premium */
    --primary-color: #1a1a2e;
    --secondary-color: #16213e;
    --accent-color: #0f3460;
    --highlight-color: #e94560;
    --light-accent: #00d9ff;
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --success-color: #06ffa5;
    --warning-color: #ffd93d;
    
    /* Neutral Colors */
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --gray: #e9ecef;
    --dark-gray: #6c757d;
    --text-dark: #2d3748;
    --text-light: #718096;
    
    /* Typography */
    --font-primary: 'Zen Kaku Gothic New', 'Noto Sans JP', sans-serif;
    --font-secondary: 'Noto Sans JP', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.25);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
}

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

/* =========================================
   Header & Navigation
   ========================================= */

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

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.5rem;
    color: var(--highlight-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    transition: var(--transition-normal);
}

.nav-menu a:hover {
    color: var(--gradient-start);
}

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

/* =========================================
   Hero Section
   ========================================= */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-color);
    z-index: -2;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
    z-index: -1;
}

/* 视频加载失败时的备用渐变背景 */
.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(135deg, rgba(26, 26, 46, 0.75) 0%, rgba(22, 33, 62, 0.7) 50%, rgba(15, 52, 96, 0.75) 100%),
        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='0.03'%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");
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--white);
    max-width: 900px;
    padding: var(--spacing-md);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease;
}

.hero-badge i {
    font-size: 1.2rem;
    color: var(--warning-color);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.gradient-text {
    background: linear-gradient(135deg, var(--success-color), var(--light-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-cta {
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-primary);
    text-decoration: none;
}

.cta-button.primary {
    background: linear-gradient(135deg, var(--highlight-color), #ff6b9d);
    color: var(--white);
    box-shadow: 0 8px 24px rgba(233, 69, 96, 0.4);
}

.cta-button.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(233, 69, 96, 0.5);
}

.cta-button.large {
    padding: 1.5rem 3rem;
    font-size: 1.2rem;
}

.cta-button i {
    font-size: 1.5rem;
}

.cta-note {
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    opacity: 0.9;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.hero-bonus-text {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--warning-color);
    background: rgba(255, 217, 61, 0.15);
    backdrop-filter: blur(10px);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    border: 2px solid rgba(255, 217, 61, 0.3);
    animation: fadeInUp 0.8s ease 0.7s backwards;
}

.hero-bonus-text i {
    font-size: 1.3rem;
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.8s backwards;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s ease infinite;
}

.hero-scroll i {
    font-size: 2rem;
    color: var(--white);
    opacity: 0.7;
}

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

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

/* =========================================
   Section Styles
   ========================================= */

section {
    padding: var(--spacing-xl) 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-top: 1.5rem;
}

/* =========================================
   About Section
   ========================================= */

.about-section {
    background: var(--light-gray);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-image {
    position: relative;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.image-placeholder i {
    font-size: 8rem;
    color: rgba(255, 255, 255, 0.3);
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.quote {
    font-size: 1.1rem;
    line-height: 1.8;
    padding: var(--spacing-md);
    background: var(--white);
    border-left: 4px solid var(--highlight-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.profile-info {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.profile-info h4 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.profile-list {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.profile-list li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-dark);
}

.profile-list i {
    color: var(--gradient-start);
    width: 20px;
}

.philosophy {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: var(--radius-sm);
    font-style: italic;
    color: var(--accent-color);
    font-weight: 500;
}

/* =========================================
   How It Works
   ========================================= */

.how-it-works {
    background: var(--white);
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.step-item {
    flex: 1;
    min-width: 250px;
    text-align: center;
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.step-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.step-icon {
    position: relative;
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step-icon i {
    font-size: 2.5rem;
    color: var(--white);
}

.step-number {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 40px;
    height: 40px;
    background: var(--highlight-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.step-item h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.step-item p {
    color: var(--text-light);
}

.step-arrow {
    font-size: 2rem;
    color: var(--gray);
}

/* =========================================
   Books Section
   ========================================= */

.books-section {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
}

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

.book-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.book-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.book-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.book-icon i {
    font-size: 2.5rem;
    color: var(--white);
}

.book-card h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.book-card > p {
    text-align: center;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.book-examples {
    list-style: none;
}

.book-examples li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-dark);
}

.book-examples i {
    color: var(--success-color);
}

/* =========================================
   Image Text Sections
   ========================================= */

.image-text-section {
    padding: var(--spacing-xl) 0;
}

.image-text-section.left-image {
    background: var(--white);
}

.image-text-section.right-image {
    background: var(--light-gray);
}

.image-text-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.image-text-section.right-image .image-text-content {
    grid-template-columns: 1fr 1fr;
}

.image-text-section.right-image .text-side {
    order: 1;
}

.image-text-section.right-image .image-side {
    order: 2;
}

.text-side h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.text-side p {
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
    line-height: 1.8;
}

.feature-list {
    list-style: none;
    margin-top: var(--spacing-md);
}

.feature-list li {
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.1rem;
    color: var(--text-dark);
}

.feature-list i {
    color: var(--success-color);
    font-size: 1.3rem;
}

.achievement-boxes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.achievement-box {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.achievement-box i {
    font-size: 2rem;
    color: var(--gradient-start);
    margin-bottom: var(--spacing-sm);
}

.achievement-box h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.achievement-box p {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0;
}

/* =========================================
   Testimonials Section
   ========================================= */

.testimonials-section {
    background: var(--light-gray);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.testimonial-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.rating {
    display: flex;
    gap: 0.25rem;
    margin-bottom: var(--spacing-sm);
}

.rating i {
    color: var(--warning-color);
    font-size: 1.2rem;
}

.testimonial-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--gray);
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.author-avatar i {
    color: var(--white);
    font-size: 1.5rem;
}

.author-info h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
    color: var(--primary-color);
}

.author-info p {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0;
}

/* =========================================
   FAQ Section
   ========================================= */

.faq-section {
    background: var(--white);
}

.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border: 2px solid var(--gray);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    transition: var(--transition-normal);
}

.faq-item:hover {
    border-color: var(--gradient-start);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    cursor: pointer;
    user-select: none;
}

.faq-question i:first-child {
    color: var(--gradient-start);
    font-size: 1.5rem;
}

.faq-question h3 {
    flex: 1;
    font-size: 1.1rem;
    color: var(--primary-color);
}

.faq-question i:last-child {
    color: var(--text-light);
    transition: var(--transition-fast);
}

.faq-item.active .faq-question i:last-child {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-dark);
    line-height: 1.7;
}

.faq-answer a {
    color: var(--gradient-start);
    text-decoration: none;
    font-weight: 600;
}

.faq-answer a:hover {
    text-decoration: underline;
}

/* =========================================
   Final CTA Section
   ========================================= */

.final-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--white);
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
}

.cta-content > p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

/* =========================================
   Footer
   ========================================= */

.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    opacity: 0.8;
    margin-bottom: var(--spacing-sm);
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: var(--transition-normal);
}

.footer-social a:hover {
    background: var(--highlight-color);
    transform: translateY(-3px);
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    opacity: 1;
    padding-left: 5px;
}

.footer-section ul li i {
    margin-right: 0.5rem;
    color: var(--success-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* =========================================
   Modal
   ========================================= */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.modal:target {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--white);
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 2px solid var(--gray);
}

.modal-header h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.modal-close {
    font-size: 2rem;
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition-fast);
}

.modal-close:hover {
    color: var(--highlight-color);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-md);
    max-height: 70vh;
    overflow-y: auto;
}

.modal-body h3 {
    font-size: 1.3rem;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.modal-body p,
.modal-body ul,
.modal-body ol {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    color: var(--text-dark);
}

.modal-body ul,
.modal-body ol {
    padding-left: var(--spacing-md);
}

.modal-body li {
    margin-bottom: 0.5rem;
}

.modal-body a {
    color: var(--gradient-start);
    text-decoration: none;
    font-weight: 600;
}

.modal-body a:hover {
    text-decoration: underline;
}

.terms-date {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray);
    color: var(--text-light);
    font-size: 0.9rem;
}

/* =========================================
   Fixed Bottom CTA Button
   ========================================= */

.fixed-cta-button {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 999;
    display: flex;
    justify-content: center;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

.fixed-cta-button .cta-button {
    width: 100%;
    max-width: 500px;
    justify-content: center;
}

/* =========================================
   Responsive Design
   ========================================= */

@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .about-content,
    .image-text-content {
        grid-template-columns: 1fr;
    }
    
    /* 平板端也改为上图下文 */
    .image-text-section.right-image .image-side {
        order: -1;
    }
    
    .image-text-section.right-image .text-side {
        order: 1;
    }
    
    .achievement-boxes {
        grid-template-columns: 1fr;
    }
    
    .step-arrow {
        display: none;
    }
    
    /* 平板端书籍分类2列 */
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-bonus-text {
        font-size: 0.95rem;
        padding: 0.85rem 1rem;
        margin-top: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
    }
    
    .hero-bonus-text i {
        font-size: 1.1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    /* 手机端书籍分类2列 */
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .book-card {
        padding: var(--spacing-sm);
    }
    
    .book-icon {
        width: 60px;
        height: 60px;
        margin-bottom: var(--spacing-sm);
    }
    
    .book-icon i {
        font-size: 1.8rem;
    }
    
    .book-card h3 {
        font-size: 1.1rem;
        margin-bottom: 0.5rem;
    }
    
    .book-card > p {
        font-size: 0.85rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .book-examples li {
        font-size: 0.85rem;
        padding: 0.35rem 0;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-button {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
    
    .cta-button.large {
        padding: 1.25rem 2.5rem;
        font-size: 1.1rem;
    }
    
    /* 图文模块移动端优化 */
    .image-text-section {
        padding: var(--spacing-lg) 0;
    }
    
    .image-text-content {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-md);
    }
    
    .image-placeholder {
        aspect-ratio: 16/9;
        max-height: 250px;
    }
    
    .image-placeholder i {
        font-size: 4rem;
    }
    
    /* 确保图片始终在文字上方 */
    .image-side {
        order: -1 !important;
    }
    
    .text-side {
        order: 1 !important;
    }
    
    /* 覆盖right-image的顺序设置 */
    .image-text-section.right-image .image-side {
        order: -1 !important;
    }
    
    .image-text-section.right-image .text-side {
        order: 1 !important;
    }
    
    .text-side h2 {
        font-size: 1.5rem;
    }
    
    .text-side p {
        font-size: 0.95rem;
    }
    
    .achievement-boxes {
        gap: var(--spacing-sm);
    }
    
    .achievement-box {
        padding: var(--spacing-sm);
    }
    
    .feature-list li {
        font-size: 1rem;
        padding: 0.5rem 0;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .fixed-cta-button {
        padding: 0.75rem var(--spacing-sm);
    }
    
    .fixed-cta-button .cta-button {
        padding: 1rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .fixed-cta-button .cta-button span {
        font-size: 0.9rem;
    }
    
    /* 视频背景移动端优化 */
    .hero-video {
        object-position: center center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-bonus-text {
        font-size: 0.85rem;
        padding: 0.75rem 0.85rem;
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .logo span {
        font-size: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    /* 小屏手机图片进一步优化 */
    .image-placeholder {
        max-height: 200px;
    }
    
    .text-side h2 {
        font-size: 1.3rem;
    }
    
    .text-side p {
        font-size: 0.9rem;
    }
    
    .feature-list li {
        font-size: 0.95rem;
    }
    
    /* 超小屏幕书籍卡片优化 */
    .book-icon {
        width: 50px;
        height: 50px;
    }
    
    .book-icon i {
        font-size: 1.5rem;
    }
    
    .book-card h3 {
        font-size: 1rem;
    }
    
    .book-card > p {
        font-size: 0.8rem;
    }
    
    .book-examples li {
        font-size: 0.8rem;
    }
    
    .modal-content {
        margin: var(--spacing-sm);
    }
}

/* =========================================
   Utility Classes
   ========================================= */

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

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }