/* ===== 蘑菇视频官网 主样式 ===== */
/* 字体 & 基础重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: #333;
    background: #fff;
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color .2s; }
a:hover { color: #7c3aed; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ===== 变量 ===== */
:root {
    --primary: #7c3aed;
    --primary-light: #a78bfa;
    --primary-dark: #5b21b6;
    --secondary: #f97316;
    --secondary-light: #fdba74;
    --bg-light: #f8f7ff;
    --bg-gray: #f5f5f7;
    --text-main: #1a1a2e;
    --text-sub: #6b7280;
    --border: #e5e7eb;
    --shadow: 0 4px 24px rgba(124,58,237,.10);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all .3s cubic-bezier(.4,0,.2,1);
}

/* ===== 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: var(--transition); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; box-shadow: 0 4px 20px rgba(124,58,237,.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(124,58,237,.4); color: #fff; }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-download { display: inline-flex; align-items: center; gap: 6px; padding: 8px 20px; background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff !important; border-radius: 50px; font-size: 14px; font-weight: 600; transition: var(--transition); }
.btn-download:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(124,58,237,.4); }

/* ===== 头部 ===== */
.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 20px; }
.logo a { display: flex; align-items: center; gap: 8px; }
.logo-icon { width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; }
.logo-text { font-size: 20px; font-weight: 800; background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.main-nav ul { display: flex; gap: 4px; }
.main-nav a { padding: 6px 14px; border-radius: 8px; font-size: 14px; font-weight: 500; color: var(--text-main); transition: var(--transition); }
.main-nav a:hover, .main-nav a.active { background: var(--bg-light); color: var(--primary); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text-main); border-radius: 2px; transition: var(--transition); }

/* ===== 搜索框 ===== */
.search-bar-wrap { background: var(--bg-light); padding: 10px 0; border-bottom: 1px solid var(--border); }
.search-bar { display: flex; flex-direction: column; gap: 6px; }
.search-form { display: flex; gap: 0; border-radius: 50px; overflow: hidden; box-shadow: 0 2px 12px rgba(124,58,237,.1); background: #fff; border: 2px solid var(--primary-light); }
.search-form input { flex: 1; padding: 10px 20px; border: none; outline: none; font-size: 14px; background: transparent; color: var(--text-main); }
.search-form button { padding: 10px 24px; background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; border: none; cursor: pointer; font-size: 14px; font-weight: 600; white-space: nowrap; transition: var(--transition); }
.search-form button:hover { opacity: .9; }
.search-hot-tags { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--text-sub); }
.search-hot-tags a { padding: 2px 10px; background: #fff; border: 1px solid var(--border); border-radius: 20px; color: var(--text-sub); font-size: 12px; transition: var(--transition); }
.search-hot-tags a:hover { border-color: var(--primary); color: var(--primary); }
.search-result-tip { background: #fff3cd; border: 1px solid #ffc107; color: #856404; padding: 10px 20px; text-align: center; font-size: 14px; }

/* ===== Hero 区域 ===== */
.hero-section { position: relative; min-height: 560px; display: flex; align-items: center; overflow: hidden; background: linear-gradient(135deg, #1a0533 0%, #3b0764 50%, #7c3aed 100%); }
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; opacity: .25; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(26,5,51,.85) 0%, rgba(124,58,237,.6) 100%); }
.hero-content { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; padding: 80px 0; }
.hero-text h1 { font-size: clamp(28px, 4vw, 48px); font-weight: 900; color: #fff; line-height: 1.2; margin-bottom: 16px; }
.hero-text h1 em { font-style: normal; background: linear-gradient(90deg, #f97316, #fbbf24); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-text .sub { font-size: 18px; color: rgba(255,255,255,.8); margin-bottom: 32px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 32px; margin-top: 40px; }
.stat-item { text-align: center; }
.stat-num { font-size: 28px; font-weight: 900; color: #fff; }
.stat-num span { font-size: 16px; }
.stat-label { font-size: 13px; color: rgba(255,255,255,.7); }
.hero-visual { position: relative; }
.hero-phone { max-width: 320px; margin: 0 auto; border-radius: 32px; overflow: hidden; box-shadow: 0 32px 80px rgba(0,0,0,.5); }
.hero-phone img { width: 100%; }
.hero-badge { position: absolute; background: #fff; border-radius: 12px; padding: 10px 16px; box-shadow: 0 8px 24px rgba(0,0,0,.15); display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; }
.hero-badge.badge-1 { top: 20%; right: -10%; }
.hero-badge.badge-2 { bottom: 20%; left: -10%; }
.hero-badge i { color: var(--secondary); font-size: 18px; }

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-gray); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag { display: inline-block; padding: 4px 16px; background: var(--bg-light); color: var(--primary); border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 12px; border: 1px solid var(--primary-light); }
.section-title { font-size: clamp(24px, 3vw, 36px); font-weight: 800; color: var(--text-main); margin-bottom: 12px; }
.section-sub { font-size: 16px; color: var(--text-sub); max-width: 600px; margin: 0 auto; }

/* ===== 品牌故事 ===== */
.brand-story { 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-text h2 { font-size: 32px; font-weight: 800; margin-bottom: 20px; }
.brand-story-text p { color: var(--text-sub); margin-bottom: 16px; line-height: 1.8; }
.brand-milestones { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px; }
.milestone { background: var(--bg-light); border-radius: var(--radius-sm); padding: 16px; border-left: 4px solid var(--primary); }
.milestone-num { font-size: 24px; font-weight: 900; color: var(--primary); }
.milestone-label { font-size: 13px; color: var(--text-sub); }

/* ===== 功能特性 ===== */
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card { background: #fff; border-radius: var(--radius); padding: 32px 24px; text-align: center; box-shadow: 0 2px 16px rgba(0,0,0,.06); border: 1px solid var(--border); transition: var(--transition); }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--primary-light); }
.feature-icon { width: 64px; height: 64px; background: linear-gradient(135deg, var(--bg-light), #ede9fe); border-radius: 16px; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 28px; color: var(--primary); }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.feature-card p { font-size: 14px; color: var(--text-sub); line-height: 1.7; }

/* ===== 视频卡片 ===== */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.video-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: 0 2px 12px rgba(0,0,0,.07); border: 1px solid var(--border); transition: var(--transition); cursor: pointer; }
.video-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.video-thumb { position: relative; overflow: hidden; aspect-ratio: 3/4; }
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.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,.35); opacity: 0; transition: var(--transition); }
.video-card:hover .video-play-btn { opacity: 1; }
.video-play-btn i { width: 56px; height: 56px; background: rgba(255,255,255,.95); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 22px; color: var(--primary); padding-left: 4px; box-shadow: 0 4px 20px rgba(0,0,0,.3); }
.video-tags { position: absolute; top: 10px; left: 10px; display: flex; gap: 6px; flex-wrap: wrap; }
.video-tag { padding: 2px 8px; background: rgba(124,58,237,.85); color: #fff; border-radius: 4px; font-size: 11px; }
.video-info { padding: 14px 16px; }
.video-title { font-size: 14px; font-weight: 600; color: var(--text-main); 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; justify-content: space-between; font-size: 12px; color: var(--text-sub); }
.video-author { display: flex; align-items: center; gap: 4px; }
.video-stats { display: flex; gap: 10px; }
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ===== 场景推荐 ===== */
.scenes-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 .4s; }
.scene-card:hover img { transform: scale(1.06); }
.scene-overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.7) 0%, transparent 60%); display: flex; flex-direction: column; justify-content: flex-end; padding: 20px; }
.scene-overlay h3 { color: #fff; font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.scene-overlay p { color: rgba(255,255,255,.8); font-size: 13px; }

/* ===== 用户评价 ===== */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card { background: #fff; border-radius: var(--radius); padding: 28px; box-shadow: 0 2px 16px rgba(0,0,0,.06); border: 1px solid var(--border); transition: var(--transition); }
.testimonial-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.testimonial-stars { color: #fbbf24; font-size: 16px; margin-bottom: 12px; }
.testimonial-content { font-size: 14px; color: var(--text-sub); line-height: 1.8; margin-bottom: 20px; font-style: italic; }
.testimonial-user { display: flex; align-items: center; gap: 12px; }
.user-avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--secondary)); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; font-weight: 700; flex-shrink: 0; }
.user-name { font-weight: 700; font-size: 14px; }
.user-role { font-size: 12px; color: var(--text-sub); }

/* ===== 媒体推荐 ===== */
.media-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.media-card { background: #fff; border-radius: var(--radius); padding: 24px; text-align: center; box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 1px solid var(--border); transition: var(--transition); }
.media-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.media-icon { font-size: 36px; color: var(--primary); margin-bottom: 12px; }
.media-name { font-weight: 700; font-size: 15px; margin-bottom: 6px; }
.media-desc { font-size: 13px; color: var(--text-sub); line-height: 1.6; }
.media-quote { font-size: 13px; color: var(--primary); margin-top: 10px; font-style: italic; }

/* ===== 下载区域 ===== */
.download-section { background: linear-gradient(135deg, #1a0533, #3b0764); color: #fff; }
.download-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.download-text h2 { font-size: 36px; font-weight: 800; margin-bottom: 16px; }
.download-text p { color: rgba(255,255,255,.8); margin-bottom: 32px; font-size: 16px; }
.download-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.download-btn { display: flex; align-items: center; gap: 12px; padding: 14px 24px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius-sm); color: #fff; transition: var(--transition); backdrop-filter: blur(8px); }
.download-btn:hover { background: rgba(255,255,255,.2); color: #fff; transform: translateY(-2px); }
.download-btn i { font-size: 28px; }
.download-btn-text { text-align: left; }
.download-btn-text small { display: block; font-size: 11px; opacity: .7; }
.download-btn-text strong { font-size: 16px; }
.download-visual img { border-radius: var(--radius); box-shadow: 0 32px 80px rgba(0,0,0,.4); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: #fff; border-radius: var(--radius-sm); margin-bottom: 12px; border: 1px solid var(--border); overflow: hidden; }
.faq-question { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; cursor: pointer; font-weight: 600; font-size: 15px; color: var(--text-main); transition: var(--transition); }
.faq-question:hover { color: var(--primary); }
.faq-question i { transition: transform .3s; color: var(--primary); }
.faq-item.open .faq-question i { transform: rotate(180deg); }
.faq-answer { padding: 0 24px; max-height: 0; overflow: hidden; transition: max-height .3s ease, padding .3s; }
.faq-item.open .faq-answer { max-height: 200px; padding: 0 24px 18px; }
.faq-answer p { color: var(--text-sub); font-size: 14px; line-height: 1.8; }

/* ===== 联系方式 ===== */
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.contact-card { background: #fff; border-radius: var(--radius); padding: 28px 20px; text-align: center; box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 1px solid var(--border); transition: var(--transition); }
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.contact-icon { width: 56px; height: 56px; background: linear-gradient(135deg, var(--bg-light), #ede9fe); border-radius: 14px; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; font-size: 24px; color: var(--primary); }
.contact-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.contact-card p { font-size: 13px; color: var(--text-sub); }

/* ===== 页脚 ===== */
.site-footer { background: #0f0520; color: rgba(255,255,255,.8); padding: 60px 0 0; }
.footer-top { display: grid; grid-template-columns: 280px 1fr; gap: 60px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer-logo { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.footer-logo .logo-icon { background: linear-gradient(135deg, var(--primary), var(--secondary)); }
.footer-logo .logo-text { color: #fff; -webkit-text-fill-color: #fff; }
.footer-slogan { font-size: 14px; color: rgba(255,255,255,.6); margin-bottom: 8px; }
.footer-domain { font-size: 13px; color: rgba(255,255,255,.5); margin-bottom: 16px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 36px; height: 36px; background: rgba(255,255,255,.1); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.7); transition: var(--transition); font-size: 16px; }
.footer-social a:hover { background: var(--primary); color: #fff; }
.footer-links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 8px; font-size: 13px; }
.footer-col ul li a { color: rgba(255,255,255,.6); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--primary-light); }
.footer-col ul li i { margin-right: 6px; color: var(--primary-light); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; padding: 20px 0; font-size: 13px; color: rgba(255,255,255,.4); flex-wrap: wrap; gap: 8px; }
.footer-bottom a { color: rgba(255,255,255,.5); }
.footer-bottom a:hover { color: var(--primary-light); }
.footer-icp { margin-top: 4px; }

/* ===== 面包屑 ===== */
.breadcrumb { padding: 14px 0; font-size: 13px; color: var(--text-sub); }
.breadcrumb a { color: var(--text-sub); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ===== 内页通用 ===== */
.page-hero { background: linear-gradient(135deg, #1a0533, #3b0764); color: #fff; padding: 60px 0; text-align: center; }
.page-hero h1 { font-size: clamp(24px, 3vw, 40px); font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 16px; color: rgba(255,255,255,.8); max-width: 600px; margin: 0 auto; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .media-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .hero-content { grid-template-columns: 1fr; gap: 40px; padding: 60px 0; }
    .hero-visual { display: none; }
    .brand-story { grid-template-columns: 1fr; }
    .download-inner { grid-template-columns: 1fr; }
    .download-visual { display: none; }
    .scenes-grid { grid-template-columns: 1fr 1fr; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
    .main-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 16px 20px; box-shadow: 0 8px 24px rgba(0,0,0,.1); }
    .main-nav.open { display: block; }
    .main-nav ul { flex-direction: column; gap: 4px; }
    .nav-toggle { display: flex; }
    .video-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr; }
    .scenes-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr 1fr; }
    .hero-stats { gap: 16px; }
    .footer-links { grid-template-columns: 1fr 1fr; }
}

/* ===== 内页样式 ===== */
.inner-content { padding: 60px 0; }
.inner-content h2 { font-size: 26px; font-weight: 800; margin-bottom: 16px; color: var(--text-main); }
.inner-content h3 { font-size: 20px; font-weight: 700; margin: 28px 0 12px; color: var(--text-main); }
.inner-content p { color: var(--text-sub); line-height: 1.8; margin-bottom: 14px; }
.inner-content ul { padding-left: 20px; margin-bottom: 14px; }
.inner-content ul li { color: var(--text-sub); line-height: 1.8; list-style: disc; }
.step-list { counter-reset: step; }
.step-item { display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start; }
.step-num { width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; font-size: 15px; flex-shrink: 0; }
.step-body h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.step-body p { font-size: 14px; color: var(--text-sub); }
.changelog-item { border-left: 3px solid var(--primary); padding: 0 0 24px 20px; margin-bottom: 8px; position: relative; }
.changelog-item::before { content: ''; width: 10px; height: 10px; background: var(--primary); border-radius: 50%; position: absolute; left: -6.5px; top: 6px; }
.changelog-version { font-size: 18px; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.changelog-date { font-size: 13px; color: var(--text-sub); margin-bottom: 10px; }
.changelog-list { padding-left: 16px; }
.changelog-list li { font-size: 14px; color: var(--text-sub); list-style: disc; line-height: 1.8; }
.tip-card { background: #fff; border-radius: var(--radius); padding: 24px; box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 1px solid var(--border); margin-bottom: 20px; }
.tip-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; color: var(--primary); }
.tip-card p { font-size: 14px; color: var(--text-sub); line-height: 1.8; }
.help-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.help-card { background: #fff; border-radius: var(--radius); padding: 24px; text-align: center; box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 1px solid var(--border); transition: var(--transition); }
.help-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.help-card i { font-size: 32px; color: var(--primary); margin-bottom: 12px; }
.help-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.help-card p { font-size: 13px; color: var(--text-sub); }
@media (max-width: 768px) { .help-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .help-grid { grid-template-columns: 1fr; } }