/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #9b59b6;
    --secondary-color: #e74c3c;
    --accent-color: #3498db;
    --bg-light: #f5f7fa;
    --bg-white: #ffffff;
    --text-dark: #2c3e50;
    --text-gray: #7f8c8d;
    --border-color: #ecf0f1;
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== 导航栏 ==================== */
.navbar {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-content {
    display: flex;
    align-items: center;
    padding: 1rem 0;
}

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

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

/* ==================== 英雄区 ==================== */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, rgba(155, 89, 182, 0.1) 0%, rgba(231, 76, 60, 0.1) 100%);
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
}

/* ==================== 故事区 ==================== */
.story-section {
    padding: 3rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.story {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    align-items: start;
}

.story.reverse {
    grid-template-columns: 1.5fr 1fr;
}

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

.avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 150px;
    height: 150px;
    margin: 0 auto;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    font-size: 2rem;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
}

.story-content {
    padding: 1.5rem;
    background: var(--bg-white);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
}

.story-title {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.story-before,
.story-after {
    margin-bottom: 1.5rem;
}

.story-before h3,
.story-after h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
    color: var(--text-dark);
}

.story-before p,
.story-after p {
    margin-bottom: 0.75rem;
    color: var(--text-gray);
    line-height: 1.7;
    font-size: 0.95rem;
}

.story-stat {
    background: linear-gradient(135deg, rgba(155, 89, 182, 0.1), rgba(231, 76, 60, 0.1));
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: center;
    border-left: 4px solid var(--primary-color);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-gray);
    display: block;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--secondary-color);
}

/* ==================== 共同主题区 ==================== */
.stories-summary {
    padding: 4rem 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.common-themes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.theme {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.theme h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.theme p {
    font-size: 0.9rem;
    opacity: 0.95;
}

/* ==================== 有效性区 ==================== */
.why-effective {
    padding: 4rem 0;
    background: var(--bg-light);
}

.effectiveness-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.effectiveness-item {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.effectiveness-icon {
    display: block;
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.effectiveness-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 700;
}

.effectiveness-item p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* ==================== 统计区 ==================== */
.statistics {
    padding: 4rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem;
    border-radius: 0.75rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.stat-big-number {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* ==================== CTA区 ==================== */
.final-cta {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.final-cta h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.final-cta p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 3.5rem;
    background: white;
    color: var(--primary-color);
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.3rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.btn-large {
    padding: 1.5rem 3.5rem;
    font-size: 1.3rem;
}

.btn-hero {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 3.5rem;
    background: white;
    color: var(--primary-color);
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.3rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 8px 25px rgba(155, 89, 182, 0.4);
    text-align: center;
}

.btn-hero:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 35px rgba(155, 89, 182, 0.5);
}

.cta-note {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    opacity: 0.85;
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 2rem 0;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .navbar-content {
        padding: 0.75rem 0;
    }

    .logo {
        font-size: 1rem;
    }

    .logo-icon {
        font-size: 1.25rem;
    }

    .hero {
        padding: 2rem 0;
    }

    .hero-title {
        font-size: 1.5rem;
        line-height: 1.3;
        margin-bottom: 1rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .story-section {
        padding: 2rem 0;
    }

    .story {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .story.reverse {
        grid-template-columns: 1fr;
    }

    .story-avatar {
        text-align: center;
        order: -1;
    }

    .avatar {
        width: 120px;
        height: 120px;
        font-size: 1.5rem;
    }

    .story-content {
        padding: 1.2rem;
    }

    .story-title {
        font-size: 1.1rem;
        margin-bottom: 1rem;
    }

    .story-before h3,
    .story-after h3 {
        font-size: 0.95rem;
        margin-bottom: 0.5rem;
    }

    .story-before p,
    .story-after p {
        font-size: 0.85rem;
        margin-bottom: 0.5rem;
    }

    .story-stat {
        padding: 0.75rem;
        text-align: center;
    }

    .stat-label {
        font-size: 0.8rem;
    }

    .stat-value {
        font-size: 1.4rem;
    }

    .stories-summary {
        padding: 2rem 0;
    }

    .section-title {
        font-size: 1.3rem;
        margin-bottom: 1.5rem;
    }

    .common-themes {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .theme {
        padding: 1.5rem;
    }

    .theme h3 {
        font-size: 1rem;
    }

    .theme p {
        font-size: 0.85rem;
    }

    .why-effective {
        padding: 2rem 0;
    }

    .effectiveness-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .effectiveness-item {
        padding: 1.2rem;
    }

    .effectiveness-icon {
        font-size: 2rem;
    }

    .effectiveness-item h3 {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }

    .effectiveness-item p {
        font-size: 0.85rem;
    }

    .statistics {
        padding: 2rem 0;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stat-card {
        padding: 1.5rem;
    }

    .stat-big-number {
        font-size: 1.8rem;
        margin-bottom: 0.5rem;
    }

    .stat-card p {
        font-size: 0.9rem;
    }

    .final-cta {
        padding: 2rem 0;
    }

    .final-cta h2 {
        font-size: 1.3rem;
        margin-bottom: 1rem;
    }

    .final-cta p {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }

    .btn {
        width: 100%;
        padding: 0.9rem 1.5rem;
        font-size: 1rem;
    }

    .btn-large {
        padding: 1rem 1.5rem;
    }

    .btn-hero {
        width: 100%;
        padding: 1.2rem 2rem;
        font-size: 1.1rem;
    }

    .cta-note {
        font-size: 0.85rem;
        margin-top: 1rem;
    }

    .footer {
        font-size: 0.85rem;
    }
}