/* ============================================
   中策大数据 - 2026白皮书页面样式
   ============================================ */

/* CSS Variables */
:root {
    --primary-color: #0066cc;
    --primary-dark: #0052a3;
    --primary-light: #e6f0ff;
    --accent-color: #00a878;
    --accent-dark: #008f63;
    --text-dark: #1a1a2e;
    --text-medium: #4a4a5a;
    --text-light: #6b6b7b;
    --bg-gray: #f5f7fa;
    --bg-white: #ffffff;
    --border-color: #e1e5eb;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-dark);
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
}

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

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

.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: 12px 24px;
    font-size: 15px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.btn svg {
    flex-shrink: 0;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-accent {
    background: var(--accent-color);
    color: #fff;
}

.btn-accent:hover {
    background: var(--accent-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1.5px solid var(--primary-color);
}

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

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

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

.btn-outline-white {
    background: transparent;
    color: #fff;
    border: 1.5px solid rgba(255,255,255,0.5);
}

.btn-outline-white:hover {
    background: rgba(255,255,255,0.1);
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-full {
    width: 100%;
}

/* ============================================
   头部导航
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
}

.header-white {
    background: #fff;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 18px;
    font-weight: 700;
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
}

.logo-text {
    color: var(--text-dark);
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    color: var(--text-medium);
    transition: color 0.2s;
}

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

.header-cta {
    padding: 8px 20px;
    background: var(--primary-color);
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
}

.header-cta:hover {
    background: var(--primary-dark);
}

/* ============================================
   封面区域
   ============================================ */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #f0f5ff 0%, #e8faf4 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-color);
    color: #fff;
    font-size: 13px;
    font-weight: 500;
    border-radius: 20px;
    margin-bottom: 20px;
}

.hero-title {
    font-size: 42px;
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 22px;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 16px;
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 560px;
}

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

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

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

/* 书籍视觉效果 */
.hero-visual {
    display: flex;
    justify-content: center;
}

.book-mockup {
    position: relative;
    width: 280px;
    height: 380px;
}

.book-cover {
    position: absolute;
    width: 240px;
    height: 320px;
    background: linear-gradient(145deg, var(--primary-color), #003d7a);
    border-radius: 4px 12px 12px 4px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: #fff;
    box-shadow: var(--shadow-lg);
    z-index: 2;
}

.book-cover-year {
    font-size: 42px;
    font-weight: 700;
    opacity: 0.9;
}

.book-cover-title {
    font-size: 22px;
    font-weight: 700;
    line-height: 1.4;
}

.book-cover-subtitle {
    font-size: 16px;
    opacity: 0.8;
}

.book-cover-brand {
    font-size: 14px;
    font-weight: 500;
}

.book-pages {
    position: absolute;
    right: 0;
    top: 16px;
    width: 220px;
    height: 300px;
    background: linear-gradient(90deg, #e8e8e8, #fff 10%);
    border-radius: 0 8px 8px 0;
    z-index: 1;
}

.book-shadow {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-40%);
    width: 260px;
    height: 20px;
    background: radial-gradient(ellipse, rgba(0,0,0,0.2), transparent);
}

/* ============================================
   通用区块
   ============================================ */
.section {
    padding: 80px 0;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    color: var(--text-dark);
}

/* ============================================
   适合人群
   ============================================ */
.audience-section {
    background: var(--bg-white);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.audience-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    background: var(--bg-gray);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--text-medium);
}

.audience-icon {
    font-size: 24px;
}

/* ============================================
   核心难题
   ============================================ */
.problems-section {
    background: var(--bg-gray);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.problem-card {
    background: #fff;
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.problem-num {
    font-size: 48px;
    font-weight: 700;
    /* color: var(--primary-light);
    opacity: 0.5; */
    margin-bottom: 12px;
    color: #0066cc;
}

.problem-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
}

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

/* ============================================
   内容预览
   ============================================ */
.content-preview {
    background: var(--bg-white);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.preview-item {
    padding: 28px;
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
}

.preview-num {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.preview-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.preview-item p {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.6;
}

.preview-cta {
    text-align: center;
    margin-top: 40px;
}

/* ============================================
   你将获得
   ============================================ */
.benefits-section {
    background: linear-gradient(135deg, var(--primary-color), #003d7a);
    color: #fff;
}

.benefits-section .section-title {
    color: #fff;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    font-size: 14px;
}

.benefit-item svg {
    flex-shrink: 0;
    color: #7dd3a8;
}

.benefits-cta {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 40px;
}

/* ============================================
   关于中策
   ============================================ */
.about-section {
    background: var(--bg-gray);
}

.about-desc {
    text-align: center;
    font-size: 16px;
    color: var(--text-medium);
    max-width: 800px;
    margin: 0 auto 40px;
}

.about-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    margin-bottom: 40px;
}

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

.about-stat-num {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
}

.about-stat-label {
    font-size: 14px;
    color: var(--text-light);
}

.about-products {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.product-tag {
    padding: 8px 20px;
    background: #fff;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-medium);
    box-shadow: var(--shadow-sm);
}

/* ============================================
   FAQ
   ============================================ */
.faq-section {
    background: var(--bg-white);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.faq-item p {
    font-size: 15px;
    color: var(--text-medium);
}

/* ============================================
   底部CTA
   ============================================ */
.cta-section {
    background: linear-gradient(135deg, var(--accent-color), #006644);
    color: #fff;
    text-align: center;
}

.cta-section h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: #1a1a2e;
    color: #fff;
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 64px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

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

.footer-brand .logo-text {
    color: #fff;
}

.footer-brand p {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 10px;
    transition: color 0.2s;
}

.footer-col a:hover {
    color: #fff;
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

/* ============================================
   弹窗样式
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    padding: 20px;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: #fff;
    border-radius: var(--radius-lg);
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-gray);
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-medium);
    transition: background 0.2s;
}

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

.modal-header {
    padding: 32px 32px 0;
    text-align: center;
}

.modal-header h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-dark);
}

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

/* ============================================
   表单样式
   ============================================ */
.download-form {
    padding: 24px 32px 32px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.form-group .required {
    color: #e53935;
}

.form-group input[type="text"],
.form-group input[type="tel"],
.form-group select {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group input::placeholder {
    color: #aaa;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-medium);
}

.checkbox-item input {
    accent-color: var(--primary-color);
}

.radio-group {
    display: flex;
    gap: 24px;
}

.radio-item {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-medium);
}

.radio-item input {
    accent-color: var(--primary-color);
}

.form-footer {
    margin-top: 24px;
}

.form-privacy {
    font-size: 12px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 16px;
}

.form-success {
    padding: 48px 32px;
    text-align: center;
}

.success-icon {
    width: 64px;
    height: 64px;
    background: #e8f5e9;
    color: var(--accent-color);
    font-size: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.form-success h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.form-success p {
    font-size: 14px;
    color: var(--text-medium);
    margin-bottom: 12px;
}

.success-note {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 20px;
}

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
    background: var(--bg-gray);
    padding: 12px 0;
    font-size: 14px;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--primary-color);
}

.breadcrumb .separator {
    margin: 0 8px;
}

/* ============================================
   文章页面 - 头部
   ============================================ */
.article-header {
    padding: 72px 0 56px;
    background: linear-gradient(135deg, #f0f5ff 0%, #f8fafc 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.article-header::before {
    content: '';
    position: absolute;
    top: -120px;
    right: -120px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0,102,204,0.04) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.article-header::after {
    content: '';
    position: absolute;
    bottom: -80px;
    left: -80px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(0,179,136,0.04) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 28px;
    position: relative;
    z-index: 1;
}

.article-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 18px;
    background: #1e3a5f;
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    border-radius: 20px;
    letter-spacing: 0.5px;
}

.article-tag::before {
    content: '📄';
    font-size: 14px;
}

.article-date {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 18px;
    background: rgba(0,102,204,0.08);
    color: #1e3a5f;
    font-size: 13px;
    font-weight: 500;
    border-radius: 20px;
}

.article-date::before {
    content: '📅';
    font-size: 13px;
}

.article-title {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.35;
    max-width: 860px;
    margin: 0 auto 16px;
    color: #111827;
    position: relative;
    z-index: 1;
    letter-spacing: -0.5px;
}

.article-subtitle {
    font-size: 18px;
    color: #6b7280;
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto 36px;
    position: relative;
    z-index: 1;
    line-height: 1.6;
}

/* 出品信息卡片 */
.article-info-card {
    display: inline-flex;
    align-items: center;
    gap: 0;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    padding: 16px 28px;
    margin-bottom: 28px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    position: relative;
    z-index: 1;
}

.info-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 0 20px;
}

.info-label {
    font-size: 11px;
    font-weight: 600;
    color: #9ca3af;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-value {
    font-size: 14px;
    font-weight: 600;
    color: #374151;
    white-space: nowrap;
}

.info-divider {
    width: 1px;
    height: 32px;
    background: #e5e7eb;
}

/* 适用对象标签 */
.article-audience {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.audience-label {
    font-size: 13px;
    font-weight: 600;
    color: #6b7280;
    white-space: nowrap;
}

.audience-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
}

.audience-tag {
    display: inline-block;
    padding: 4px 12px;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    font-size: 12px;
    color: #6b7280;
    transition: all 0.2s;
}

.audience-tag:hover {
    border-color: #3b82f6;
    color: #3b82f6;
    background: #f0f5ff;
}

/* ============================================
   文章正文
   ============================================ */
.article-content {
    padding: 60px 0;
    background: var(--bg-white);
}

.content-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.chapter {
    margin-bottom: 56px;
}

.chapter-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
}

.chapter-appendix .chapter-title {
    border-bottom-color: var(--accent-color);
}

.section-heading {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 32px 0 16px;
}

.chapter p {
    font-size: 15px;
    line-height: 1.9;
    color: var(--text-medium);
    margin-bottom: 16px;
}

.chapter strong {
    color: var(--text-dark);
    font-weight: 600;
}

.numbered-list {
    padding-left: 24px;
    margin: 16px 0;
}

.numbered-list li {
    font-size: 15px;
    color: var(--text-medium);
    margin-bottom: 8px;
    line-height: 1.7;
}

.bullet-list {
    padding-left: 24px;
    margin: 16px 0;
}

.bullet-list li {
    font-size: 15px;
    color: var(--text-medium);
    margin-bottom: 8px;
    line-height: 1.7;
}

/* 表格 */
.table-wrapper {
    margin: 24px 0;
    overflow-x: auto;
}

.comparison-table,
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.comparison-table th,
.comparison-table td,
.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--primary-color);
    color: #fff;
    font-weight: 600;
}

.comparison-table th:nth-child(2),
.comparison-table td:nth-child(2) {
    background: #f8f9fa;
}

.data-table th {
    background: var(--bg-gray);
    font-weight: 600;
    color: var(--text-dark);
}

.data-table td {
    color: var(--text-medium);
}

/* 产品网格 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.product-item {
    padding: 20px;
    background: var(--bg-gray);
    border-radius: var(--radius-md);
}

.product-item h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.product-item p {
    font-size: 14px;
    color: var(--text-medium);
    margin-bottom: 0;
}

/* 趋势列表 */
.trend-list {
    margin: 24px 0;
}

.trend-item {
    display: flex;
    gap: 20px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.trend-item:last-child {
    border-bottom: none;
}

.trend-num {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
}

.trend-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.trend-content p {
    font-size: 14px;
    color: var(--text-medium);
    margin-bottom: 0;
}

/* FAQ 详情 */
.faq-detail-list {
    margin: 24px 0;
}

.faq-detail-item {
    padding: 20px;
    background: var(--bg-gray);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}

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

.faq-detail-item h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.faq-detail-item p {
    font-size: 14px;
    color: var(--text-medium);
    margin-bottom: 0;
}

/* ============================================
   下载区域
   ============================================ */
.download-section {
    padding: 80px 0;
    background: var(--bg-gray);
}

.download-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-md);
}

.download-content h2 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.download-content > p {
    font-size: 15px;
    color: var(--text-medium);
    margin-bottom: 24px;
}

.download-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.download-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-medium);
}

.download-feature svg {
    color: var(--accent-color);
    flex-shrink: 0;
}

.download-form-wrapper {
    background: var(--bg-gray);
    padding: 32px;
    border-radius: var(--radius-lg);
}

.download-form-wrapper h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
    text-align: center;
}

.inline-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.inline-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 0;
}

.inline-form input,
.inline-form select {
    width: 100%;
    padding: 12px 14px;
    font-size: 14px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    transition: border-color 0.2s;
}

.inline-form input:focus,
.inline-form select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.inline-form input::placeholder {
    color: #aaa;
}

.form-privacy-small {
    font-size: 12px;
    color: var(--text-light);
    text-align: center;
    margin-top: 12px;
}

/* ============================================
   固定下载栏
   ============================================ */
.fixed-download-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #fff;
    border-top: 1px solid var(--border-color);
    padding: 12px 0;
    box-shadow: 0 -4px 16px rgba(0,0,0,0.1);
    transform: translateY(100%);
    transition: transform 0.3s ease;
    z-index: 99;
}

.fixed-download-bar.visible {
    transform: translateY(0);
}

.fixed-bar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.fixed-bar-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
}

.fixed-bar-actions {
    display: flex;
    gap: 12px;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-visual {
        order: -1;
    }

    .hero-title {
        font-size: 34px;
    }

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

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

    .download-box {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

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

    .hero {
        padding: 48px 0;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

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

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 22px;
    }

    .audience-grid,
    .problems-grid,
    .preview-grid {
        grid-template-columns: 1fr;
    }

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

    .about-stats {
        flex-direction: column;
        gap: 24px;
    }

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

    .section {
        padding: 48px 0;
    }

    .section-title {
        font-size: 24px;
    }

    .article-title {
        font-size: 24px;
    }

    .chapter-title {
        font-size: 22px;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .inline-form .form-row {
        grid-template-columns: 1fr;
    }

    .download-box {
        padding: 32px 24px;
    }

    .fixed-bar-content {
        flex-direction: column;
        gap: 12px;
    }

    .fixed-bar-actions {
        width: 100%;
    }

    .fixed-bar-actions .btn {
        flex: 1;
    }

    .book-mockup {
        transform: scale(0.8);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 24px;
    }

    .article-header {
        padding: 48px 0 36px;
    }

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

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

    .article-info-card {
        flex-direction: column;
        gap: 0;
        padding: 16px 20px;
        width: 100%;
        max-width: 360px;
    }

    .info-divider {
        width: 100%;
        height: 1px;
        margin: 12px 0;
    }

    .article-audience {
        flex-direction: column;
        align-items: center;
    }

    .audience-tags {
        justify-content: center;
    }

    .audience-tag {
        font-size: 11px;
        padding: 3px 10px;
    }

    .btn-large {
        padding: 14px 24px;
        font-size: 15px;
    }

    .article-actions {
        flex-direction: column;
    }

    .article-actions .btn {
        width: 100%;
    }
}

/* ============================================
   白皮书详情页新增样式
   ============================================ */

/* 首屏下载提示 */
.download-prompt {
    padding: 48px 0;
    background: linear-gradient(135deg, var(--primary-light), #e8faf4);
}

.prompt-box {
    background: #fff;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.prompt-box h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.prompt-box > p {
    font-size: 16px;
    color: var(--text-medium);
    margin-bottom: 16px;
}

.prompt-desc {
    font-size: 15px;
    color: var(--text-medium);
    line-height: 1.7;
    margin-bottom: 12px;
}

.prompt-box .btn {
    margin-top: 24px;
}

/* 引用框 */
.quote-box {
    margin: 24px 0;
    padding: 24px 32px;
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
}

.quote-box.success-box {
    border-left-color: var(--accent-color);
    background: linear-gradient(135deg, #f5f7fa, #f0f8f5);
}

.quote-box strong {
    color: var(--text-dark);
    font-weight: 600;
    display: block;
    margin-bottom: 8px;
}

.quote-box p {
    font-size: 15px;
    color: var(--text-medium);
    line-height: 1.7;
    margin: 0;
}


/* 表单转化区域 */
.download-form-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-light), #e8faf4);
}

.form-box {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.form-header {
    text-align: center;
    margin-bottom: 40px;
}

.form-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-header p {
    font-size: 14px;
    color: var(--text-medium);
}

/* 为什么要下载 */
.form-reasons {
    margin-bottom: 32px;
}

.form-reasons h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.reasons-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.reason-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-gray);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-medium);
}

.reason-item svg {
    color: var(--accent-color);
    flex-shrink: 0;
}

/* 适合谁下载 */
.form-audience {
    margin-bottom: 32px;
    padding: 24px;
    background: var(--primary-light);
    border-radius: var(--radius-lg);
}

.form-audience h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.audience-list {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 2;
    padding-left: 20px;
}

.audience-list li {
    margin-bottom: 4px;
}

/* 白皮书目录预览 */
.form-toc {
    margin-bottom: 32px;
}

.form-toc h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.toc-list {
    font-size: 14px;
    color: var(--text-medium);
    padding-left: 24px;
    line-height: 2;
}

.toc-list li {
    margin-bottom: 4px;
}

/* 表单样式 */
.lead-form {
    margin-bottom: 32px;
}

.lead-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.lead-form .form-field {
    margin-bottom: 0;
}

.lead-form label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.lead-form .required {
    color: #e53935;
}

.lead-form input {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color 0.2s;
    font-family: inherit;
}

.lead-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.lead-form input::placeholder {
    color: #aaa;
}

.lead-form button {
    margin-top: 24px;
}

/* 表单成功消息 */
.form-success {
    text-align: center;
    padding: 48px 0;
}

.form-success .success-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #e8f5e9, #c8e6c9);
    color: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.form-success h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.form-success p {
    font-size: 15px;
    color: var(--text-medium);
    margin-bottom: 12px;
    line-height: 1.7;
}

.success-next {
    background: var(--bg-gray);
    padding: 24px;
    border-radius: var(--radius-lg);
    margin: 24px 0;
}

.success-next h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.success-next ul {
    font-size: 14px;
    color: var(--text-medium);
    padding-left: 20px;
    line-height: 1.8;
}

/* 中策能提供什么 */
.form-provider {
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.form-provider h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
    text-align: center;
}

.provider-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
}

.provider-tags .tag {
    padding: 8px 16px;
    background: var(--primary-light);
    color: var(--primary-color);
    font-size: 13px;
    border-radius: 20px;
    font-weight: 500;
}

.form-provider > p {
    text-align: center;
    font-size: 15px;
    color: var(--text-medium);
    font-weight: 500;
}

/* 页面底部转化文案 */
.bottom-cta {
    background: var(--bg-gray);
}

.cta-box {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-box h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.cta-box p {
    font-size: 16px;
    color: var(--text-medium);
    margin-bottom: 16px;
    line-height: 1.7;
}

.cta-box .btn {
    margin-top: 24px;
}

/* 预约演示区域 */
.demo-section {
    background: linear-gradient(135deg, var(--accent-color), #006644);
    color: #fff;
}

.demo-box {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.demo-box h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
}

.demo-box p {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 16px;
    line-height: 1.7;
}

.demo-box .btn {
    margin-top: 24px;
}

/* 作者信息 */
.author-info {
    padding: 32px;
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
}

/* 信源引用 */
.references {
    padding: 24px;
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
}

/* 响应式调整 */
@media (max-width: 1024px) {
    .reasons-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .download-form-section {
        padding: 48px 0;
    }

    .form-box {
        padding: 32px 24px;
    }

    .form-header h2 {
        font-size: 24px;
    }

    .lead-form .form-row {
        grid-template-columns: 1fr;
    }

    .cta-box h2,
    .demo-box h2 {
        font-size: 24px;
    }

    .prompt-box {
        padding: 32px 24px;
    }

    .prompt-box h2 {
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .form-box {
        padding: 24px 16px;
    }

    .form-header h2 {
        font-size: 20px;
    }

    .cta-box h2,
    .demo-box h2 {
        font-size: 20px;
    }

    .prompt-box h2 {
        font-size: 20px;
    }

    .quote-box {
        padding: 16px 20px;
    }
}