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

:root {
    --primary-color: #e74c3c;
    --primary-dark: #c0392b;
    --secondary-color: #3498db;
    --bg-light: #f8f9fa;
    --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;
}

.highlight {
    color: var(--primary-color);
    font-weight: 700;
}

/* ==================== 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;
    justify-content: space-between;
    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;
}

/* ==================== 英雄问题区 ==================== */
.hero-pain {
    padding: 4rem 0;
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.05) 0%, rgba(52, 152, 219, 0.05) 100%);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.pain-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.pain-item {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

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

.pain-item p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

.pain-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-top: 2rem;
}

/* ==================== 问题解释区 ==================== */
.problem-explanation {
    padding: 4rem 0;
    background: var(--bg-white);
}

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

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

.explanation-text p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    color: var(--text-gray);
}

.explanation-list {
    list-style: none;
    padding: 0;
}

.explanation-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
    color: var(--text-dark);
}

.explanation-list li strong {
    color: var(--primary-color);
}

.impact-warning {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1) 0%, rgba(231, 76, 60, 0.05) 100%);
    padding: 2rem;
    border-radius: 1rem;
    border-left: 4px solid var(--primary-color);
}

.impact-warning h3 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.impact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.impact-item {
    text-align: center;
    padding: 1rem;
    background: var(--bg-white);
    border-radius: 0.5rem;
}

.impact-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.impact-item p {
    font-size: 0.85rem;
    color: var(--text-gray);
}

/* ==================== 解决方案区 ==================== */
.solution {
    padding: 4rem 0;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05) 0%, rgba(231, 76, 60, 0.05) 100%);
}

.solution-message {
    text-align: center;
    margin-bottom: 3rem;
}

.solution-lead {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.solution-description {
    font-size: 1.1rem;
    color: var(--text-gray);
}

.solution-benefits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.5rem;
}

.benefit-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    position: relative;
}

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

.benefit-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: 800;
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.benefit-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.benefit-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* ==================== 工具介绍区 ==================== */
.tool-intro {
    padding: 4rem 0;
    background: var(--bg-white);
}

.tool-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.tool-description p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    color: var(--text-gray);
}

.tool-features {
    list-style: none;
    padding: 0;
}

.tool-features li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
    color: var(--text-dark);
}

.tool-features li strong {
    color: var(--primary-color);
}

.tool-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

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

/* ==================== FAQ区 ==================== */
.faq {
    padding: 4rem 0;
    background: var(--bg-light);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.faq-item {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.faq-item h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.faq-item p {
    color: var(--text-gray);
    font-size: 0.9rem;
    line-height: 1.7;
}

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

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

.cta-content 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;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.3rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary: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: var(--primary-color);
    color: white;
    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(231, 76, 60, 0.4);
    text-align: center;
}

.btn-hero:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 35px rgba(231, 76, 60, 0.5);
    background: var(--primary-dark);
}

.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;
}

.footer-text {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 0.5rem;
}

.footer-copyright {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ==================== 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-pain {
        padding: 2rem 0;
    }

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

    .pain-points {
        grid-template-columns: 1fr;
        gap: 1rem;
        margin-bottom: 1.5rem;
    }

    .pain-item {
        padding: 1.2rem;
    }

    .pain-icon {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }

    .pain-item p {
        font-size: 0.9rem;
    }

    .pain-subtitle {
        font-size: 1rem;
        margin-top: 1.5rem;
    }

    .problem-explanation {
        padding: 2rem 0;
    }

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

    .explanation-content,
    .tool-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .explanation-text p {
        font-size: 1rem;
        margin-bottom: 1rem;
    }

    .explanation-list li {
        padding: 0.75rem 0;
        font-size: 0.9rem;
    }

    .impact-warning {
        padding: 1.5rem;
        margin-top: 1.5rem;
    }

    .impact-warning h3 {
        font-size: 1.1rem;
        margin-bottom: 1rem;
    }

    .impact-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .impact-item {
        padding: 0.75rem;
    }

    .impact-number {
        font-size: 1.8rem;
    }

    .solution {
        padding: 2rem 0;
    }

    .solution-message {
        margin-bottom: 2rem;
    }

    .solution-lead {
        font-size: 1.1rem;
        margin-bottom: 0.3rem;
    }

    .solution-description {
        font-size: 1rem;
    }

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

    .benefit-card {
        padding: 1.5rem;
    }

    .benefit-card h3 {
        font-size: 1rem;
    }

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

    .tool-intro {
        padding: 2rem 0;
    }

    .tool-content {
        grid-template-columns: 1fr;
    }

    .tool-description p {
        font-size: 1rem;
        margin-bottom: 1rem;
    }

    .tool-features li {
        padding: 0.75rem 0;
        font-size: 0.9rem;
    }

    .tool-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
        margin-top: 1.5rem;
    }

    .stat {
        padding: 1.5rem;
    }

    .stat-number {
        font-size: 1.8rem;
    }

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

    .faq {
        padding: 2rem 0;
    }

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

    .faq-item {
        padding: 1.2rem;
    }

    .faq-item h3 {
        font-size: 0.95rem;
    }

    .faq-item p {
        font-size: 0.85rem;
        line-height: 1.6;
    }

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

    .cta-content h2 {
        font-size: 1.3rem;
        margin-bottom: 0.75rem;
    }

    .cta-content p {
        font-size: 1rem;
        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-text {
        font-size: 0.85rem;
    }

    .footer-copyright {
        font-size: 0.8rem;
    }
}