/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #FCD34D;
    --primary-dark: #F59E0B;
    --secondary: #34D399;
    --bg: #FFFDF5;
    --text: #1F2937;
    --text-light: #6B7280;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    --radius: 24px;
    --transition: 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

a {
    color: inherit;
    text-decoration: none;
}

/* ===== 导航栏 ===== */
.navbar {
    background: rgba(255, 253, 245, 0.92);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    padding: 12px 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 20px;
}

.nav-logo img {
    border-radius: 8px;
}

.nav-links {
    display: flex;
    gap: 28px;
    font-size: 15px;
    color: var(--text-light);
}

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

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

.nav-toggle {
    display: none;
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text);
}

/* ===== Hero ===== */
.hero {
    padding: 60px 0 80px;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 32px;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 48px;
    font-weight: 600;
    font-size: 16px;
    border: none;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    box-shadow: 0 4px 16px rgba(252, 211, 77, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(252, 211, 77, 0.45);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--primary);
}

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

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-image img {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: #f0f0f0;
}

/* ===== 通用标题 ===== */
.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
}

/* ===== 功能卡片 ===== */
.features {
    padding: 60px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 28px;
}

.feature-card {
    background: #fff;
    padding: 28px 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

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

/* ===== 使用步骤（横向三列，图片完整显示） ===== */
.how-to-use {
    padding: 60px 0;
    background: #fff;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 960px;
    margin: 0 auto;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    flex-shrink: 0;
}

.step-content {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.step-content img {
    width: 100%;
    max-width: 220px;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: #f0f0f0;
    margin-bottom: 12px;
}

.step-content h3 {
    font-size: 18px;
    margin-bottom: 4px;
}

.step-content p {
    color: var(--text-light);
    font-size: 14px;
    max-width: 240px;
    margin: 0 auto;
}

/* 移动端改回纵向排列 */
@media (max-width: 768px) {
    .steps {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .step-content img {
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    .step-content img {
        max-width: 200px;
    }
}

/* ===== 下载区 ===== */
.download {
    padding: 60px 0;
}

.download-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 18px;
    margin-bottom: 40px;
}

.download-cards {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.download-card {
    background: #fff;
    padding: 32px 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    min-width: 240px;
    flex: 1;
    max-width: 320px;
    transition: transform var(--transition);
}

.download-card:hover {
    transform: translateY(-4px);
}

.download-icon {
    font-size: 48px;
    margin-bottom: 8px;
}

.download-card h3 {
    font-size: 20px;
    margin-bottom: 4px;
}

.download-card p {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 16px;
}

.download-btn {
    display: inline-block;
    background: var(--primary);
    padding: 8px 24px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 14px;
    transition: background var(--transition);
}

.download-card:hover .download-btn {
    background: var(--primary-dark);
}

.download-versions {
    text-align: center;
    margin-top: 32px;
    color: var(--text-light);
    font-size: 14px;
}

.download-versions code {
    background: #f0f0f0;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 13px;
}

/* ===== FAQ ===== */
.faq {
    padding: 60px 0;
    background: #fff;
}

.faq-list {
    max-width: 720px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding: 16px 0;
}

.faq-item summary {
    font-weight: 600;
    font-size: 18px;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "▼";
    font-size: 14px;
    color: var(--text-light);
    transition: transform var(--transition);
}

.faq-item[open] summary::after {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 12px 0 4px;
    color: var(--text-light);
    font-size: 15px;
}

.faq-answer ol,
.faq-answer ul {
    padding-left: 20px;
    margin: 8px 0;
}

.faq-answer a {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ===== 页脚 ===== */
.footer {
    padding: 40px 0 32px;
    border-top: 1px solid rgba(0, 0, 0, 0.04);
    background: var(--bg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

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

.footer-links {
    display: flex;
    gap: 24px;
    font-size: 14px;
}

.footer-links a {
    color: var(--text-light);
    transition: color var(--transition);
}

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

/* ===== 小程序码弹窗 ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal-overlay.active {
    display: flex;
}

.modal-box {
    background: #fff;
    padding: 40px 32px 32px;
    border-radius: var(--radius);
    text-align: center;
    max-width: 400px;
    width: 90%;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.modal-box h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.modal-box img {
    width: 220px;
    height: 220px;
    border-radius: 16px;
    background: #f0f0f0;
    margin: 12px 0;
}

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

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 28px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    transition: color var(--transition);
}

.modal-close:hover {
    color: var(--text);
}

/* ===== 响应式（移动端适配） ===== */
@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 32px;
    }
    .hero-text h1 {
        font-size: 36px;
    }
    .hero-subtitle {
        font-size: 18px;
    }
    .hero-buttons {
        justify-content: center;
    }

    /* 步骤改为纵向 */
    .steps {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .step-content img {
        max-width: 280px;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        gap: 12px;
        padding: 16px 0;
        width: 100%;
    }
    .nav-links.open {
        display: flex;
    }
    .nav-toggle {
        display: block;
    }
    .nav-container {
        flex-wrap: wrap;
    }

    .download-cards {
        flex-direction: column;
        align-items: center;
    }
    .download-card {
        max-width: 100%;
        width: 100%;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .modal-box {
        padding: 28px 16px 24px;
    }
    .modal-box img {
        width: 180px;
        height: 180px;
    }

    .section-title {
        font-size: 28px;
        margin-bottom: 32px;
    }
}

/* 小屏手机额外优化 */
@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 28px;
    }
    .btn {
        font-size: 14px;
        padding: 12px 24px;
    }
    .step-content img {
        max-width: 200px;
    }
    .download-card {
        padding: 24px 20px;
    }
}