/* ========================================
   91网 - 主样式文件
   生活技能视频教程平台
======================================== */

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

:root {
    --primary: #e8001a;
    --primary-dark: #b5001a;
    --primary-light: #ff4d5e;
    --accent: #ff6b35;
    --text-dark: #1a1a2e;
    --text-mid: #444;
    --text-light: #777;
    --bg-light: #f8f9fa;
    --bg-white: #fff;
    --border: #e5e5e5;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 32px rgba(232,0,26,0.15);
    --radius: 12px;
    --radius-sm: 6px;
    --transition: 0.3s ease;
    --font-main: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    color: var(--text-dark);
    background: var(--bg-white);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

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

ul, ol {
    list-style: none;
}

/* ---- 容器 ---- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ---- 按钮 ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    color: #fff;
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

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

.btn-white:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
}

/* ---- 节标题 ---- */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-label {
    display: inline-block;
    background: rgba(232,0,26,0.08);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    padding: 5px 16px;
    border-radius: 50px;
    margin-bottom: 14px;
    text-transform: uppercase;
}

.section-title {
    font-size: clamp(24px, 4vw, 38px);
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.3;
    margin-bottom: 14px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ---- 顶部公告栏 ---- */
.top-bar {
    background: var(--primary);
    color: #fff;
    text-align: center;
    padding: 8px 20px;
    font-size: 13px;
    font-weight: 500;
}

.top-bar a {
    color: #ffe;
    text-decoration: underline;
}

/* ---- 导航 ---- */
.site-header {
    background: #fff;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: 20px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.nav-logo img {
    width: 44px;
    height: 44px;
    object-fit: contain;
    border-radius: 8px;
}

.nav-logo-text {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-menu a {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-mid);
    transition: all var(--transition);
    white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
    background: rgba(232,0,26,0.06);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ---- 搜索框 ---- */
.search-bar-wrap {
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.search-bar-inner {
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 700px;
    margin: 0 auto;
    padding: 0 20px;
}

.search-bar-inner input {
    flex: 1;
    border: 2px solid var(--border);
    border-radius: 50px;
    padding: 10px 20px;
    font-size: 14px;
    font-family: var(--font-main);
    outline: none;
    transition: border-color var(--transition);
    background: #fff;
}

.search-bar-inner input:focus {
    border-color: var(--primary);
}

.search-bar-inner button {
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50px;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-main);
    transition: background var(--transition);
    white-space: nowrap;
}

.search-bar-inner button:hover {
    background: var(--primary-dark);
}

/* ---- 英雄区 ---- */
.hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 60%, #0f3460 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('../assets/images/hero-banner.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.35;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
    padding: 80px 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(232,0,26,0.9);
    color: #fff;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: #fff;
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero h1 {
    font-size: clamp(28px, 5vw, 52px);
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 16px;
}

.hero h1 em {
    font-style: normal;
    color: var(--primary-light);
}

.hero-sub {
    font-size: clamp(15px, 2vw, 18px);
    color: rgba(255,255,255,0.8);
    margin-bottom: 32px;
    max-width: 540px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 32px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.15);
}

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

.hero-stat-num {
    font-size: 28px;
    font-weight: 800;
    color: #fff;
    line-height: 1;
}

.hero-stat-label {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
}

/* ---- 视频区 ---- */
.section {
    padding: 80px 0;
}

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

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.video-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #111;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.video-card:hover .video-thumb img {
    transform: scale(1.05);
}

.video-play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.3);
    opacity: 0;
    transition: opacity var(--transition);
}

.video-card:hover .video-play-btn {
    opacity: 1;
}

.play-icon {
    width: 60px;
    height: 60px;
    background: rgba(232,0,26,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0.8);
    transition: transform var(--transition);
}

.video-card:hover .play-icon {
    transform: scale(1);
}

.play-icon::after {
    content: '';
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 0 10px 20px;
    border-color: transparent transparent transparent #fff;
    margin-left: 4px;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
}

.video-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--primary);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 50px;
}

.video-info {
    padding: 16px;
}

.video-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 12px;
    color: var(--text-light);
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ---- 品牌故事 ---- */
.brand-story-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.brand-story-img {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.brand-story-img img {
    width: 100%;
    height: 380px;
    object-fit: cover;
}

.brand-story-content h2 {
    font-size: clamp(22px, 3vw, 34px);
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}

.brand-story-content p {
    color: var(--text-mid);
    margin-bottom: 16px;
    font-size: 15px;
}

.brand-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 28px;
}

.brand-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: rgba(232,0,26,0.08);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.feature-text h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 2px;
}

.feature-text p {
    font-size: 12px;
    color: var(--text-light);
    margin: 0;
}

/* ---- 场景推荐 ---- */
.scene-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.scene-card {
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    aspect-ratio: 4/3;
    cursor: pointer;
}

.scene-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.scene-card:hover img {
    transform: scale(1.06);
}

.scene-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 20px;
}

.scene-title {
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 6px;
}

.scene-desc {
    color: rgba(255,255,255,0.8);
    font-size: 13px;
}

/* ---- 用户评价 ---- */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.review-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(232,0,26,0.2);
}

.review-stars {
    display: flex;
    gap: 3px;
    margin-bottom: 12px;
}

.review-stars span {
    color: #ffc107;
    font-size: 16px;
}

.review-text {
    font-size: 14px;
    color: var(--text-mid);
    line-height: 1.7;
    margin-bottom: 16px;
}

.review-user {
    display: flex;
    align-items: center;
    gap: 10px;
}

.review-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

.review-name {
    font-size: 14px;
    font-weight: 600;
}

.review-date {
    font-size: 12px;
    color: var(--text-light);
}

/* ---- 媒体推荐 ---- */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.media-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.media-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
}

.media-icon {
    font-size: 36px;
    margin-bottom: 10px;
}

.media-name {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
}

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

/* ---- 购买指南 ---- */
.guide-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}

.guide-steps::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: linear-gradient(to right, var(--primary), var(--accent));
    z-index: 0;
}

.guide-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-num {
    width: 60px;
    height: 60px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 800;
    margin: 0 auto 16px;
    box-shadow: 0 4px 16px rgba(232,0,26,0.3);
}

.step-title {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
}

.step-desc {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ---- FAQ ---- */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: #fff;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 22px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    transition: background var(--transition);
    user-select: none;
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-question.active {
    color: var(--primary);
    background: rgba(232,0,26,0.04);
}

.faq-icon {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
    transition: transform var(--transition);
    color: var(--primary);
}

.faq-question.active .faq-icon {
    transform: rotate(45deg);
    background: var(--primary);
    color: #fff;
}

.faq-answer {
    display: none;
    padding: 0 22px 18px;
    font-size: 14px;
    color: var(--text-mid);
    line-height: 1.8;
    border-top: 1px solid var(--border);
}

.faq-answer.open {
    display: block;
}

/* ---- 联系方式 ---- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.contact-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.contact-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}

.contact-icon {
    font-size: 40px;
    margin-bottom: 14px;
}

.contact-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
}

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

/* ---- CTA Banner ---- */
.cta-banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 70px 0;
    text-align: center;
}

.cta-banner h2 {
    font-size: clamp(22px, 4vw, 38px);
    font-weight: 800;
    color: #fff;
    margin-bottom: 14px;
}

.cta-banner p {
    color: rgba(255,255,255,0.85);
    font-size: 16px;
    margin-bottom: 32px;
}

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

/* ---- 页脚 ---- */
.site-footer {
    background: var(--text-dark);
    color: rgba(255,255,255,0.75);
    padding: 60px 0 0;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-brand img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: 8px;
}

.footer-brand-name {
    font-size: 20px;
    font-weight: 800;
    color: #fff;
}

.footer-desc {
    font-size: 13px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.social-btn {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: background var(--transition);
    cursor: pointer;
}

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

.footer-col h4 {
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    transition: color var(--transition);
}

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

.footer-bottom {
    padding: 20px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    color: rgba(255,255,255,0.45);
    flex-wrap: wrap;
    gap: 10px;
}

.footer-bottom a {
    color: rgba(255,255,255,0.45);
    transition: color var(--transition);
}

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

/* ---- 面包屑 ---- */
.breadcrumb {
    padding: 14px 0;
    font-size: 13px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

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

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

.breadcrumb .sep {
    color: var(--border);
}

.breadcrumb .current {
    color: var(--text-dark);
    font-weight: 500;
}

/* ---- 内页头部 ---- */
.page-hero {
    background: linear-gradient(135deg, #1a1a2e 0%, #0f3460 100%);
    padding: 60px 0;
    text-align: center;
    color: #fff;
}

.page-hero h1 {
    font-size: clamp(24px, 4vw, 42px);
    font-weight: 800;
    margin-bottom: 12px;
}

.page-hero p {
    font-size: 16px;
    color: rgba(255,255,255,0.8);
    max-width: 600px;
    margin: 0 auto;
}

/* ---- 内页内容 ---- */
.inner-content {
    padding: 60px 0;
}

.inner-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 40px;
    align-items: start;
}

.content-main h2 {
    font-size: 22px;
    font-weight: 700;
    margin: 28px 0 14px;
    color: var(--text-dark);
}

.content-main h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 22px 0 10px;
    color: var(--text-dark);
}

.content-main p {
    font-size: 15px;
    color: var(--text-mid);
    line-height: 1.8;
    margin-bottom: 16px;
}

.content-main ul {
    list-style: disc;
    padding-left: 24px;
    margin-bottom: 16px;
}

.content-main ul li {
    font-size: 15px;
    color: var(--text-mid);
    margin-bottom: 8px;
    line-height: 1.7;
}

/* ---- 侧边栏 ---- */
.sidebar-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

.sidebar-card h3 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
    color: var(--text-dark);
}

.sidebar-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-links a {
    font-size: 13px;
    color: var(--text-mid);
    padding: 6px 0;
    border-bottom: 1px solid var(--bg-light);
    transition: color var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.sidebar-links a::before {
    content: '›';
    color: var(--primary);
    font-size: 16px;
}

.sidebar-links a:hover {
    color: var(--primary);
}

/* ---- 标签 ---- */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--bg-light);
    border-radius: 50px;
    font-size: 12px;
    color: var(--text-mid);
    transition: all var(--transition);
    cursor: pointer;
}

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

/* ---- 更新日志 ---- */
.changelog-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.changelog-item {
    display: flex;
    gap: 20px;
}

.changelog-date {
    flex-shrink: 0;
    width: 100px;
    text-align: right;
    padding-top: 4px;
}

.changelog-version {
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
    background: rgba(232,0,26,0.08);
    padding: 2px 8px;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 4px;
}

.changelog-time {
    font-size: 12px;
    color: var(--text-light);
}

.changelog-line {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.changelog-dot {
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 6px;
}

.changelog-line-bar {
    width: 2px;
    flex: 1;
    background: var(--border);
    min-height: 40px;
}

.changelog-content {
    flex: 1;
    padding-bottom: 16px;
}

.changelog-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.changelog-content ul {
    list-style: disc;
    padding-left: 20px;
}

.changelog-content ul li {
    font-size: 14px;
    color: var(--text-mid);
    margin-bottom: 6px;
}

/* ---- 下载卡片 ---- */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.download-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    text-align: center;
    transition: all var(--transition);
}

.download-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
}

.download-icon {
    font-size: 44px;
    margin-bottom: 12px;
}

.download-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.download-size {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 16px;
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .guide-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .guide-steps::before {
        display: none;
    }
    .inner-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.1);
        gap: 4px;
    }
    .nav-menu.open {
        display: flex;
    }
    .nav-menu a {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
    }
    .nav-toggle {
        display: flex;
    }
    .nav-actions .btn {
        display: none;
    }
    .brand-story-grid {
        grid-template-columns: 1fr;
    }
    .scene-grid {
        grid-template-columns: 1fr;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .hero-stats {
        gap: 20px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    .brand-features {
        grid-template-columns: 1fr;
    }
    .hero-actions {
        flex-direction: column;
    }
}

/* ---- 动画 ---- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease both;
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-light);
}
::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

/* ---- 视频模态框 ---- */
.video-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}

.video-modal.open {
    display: flex;
}

.video-modal-inner {
    background: #000;
    border-radius: var(--radius);
    overflow: hidden;
    width: 90%;
    max-width: 800px;
    position: relative;
}

.video-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.2);
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: background var(--transition);
}

.video-modal-close:hover {
    background: var(--primary);
}

.video-modal video {
    width: 100%;
    aspect-ratio: 16/9;
    display: block;
}

/* ---- 教程步骤 ---- */
.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.tutorial-step {
    display: flex;
    gap: 20px;
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.tutorial-step-num {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 800;
    flex-shrink: 0;
}

.tutorial-step-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.tutorial-step-content p {
    font-size: 14px;
    color: var(--text-mid);
    margin: 0;
}

/* ---- 帮助中心 ---- */
.help-cats {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.help-cat {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all var(--transition);
}

.help-cat:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
}

.help-cat-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.help-cat-name {
    font-size: 14px;
    font-weight: 600;
}