/* =====================================================
   有些人脉 relpeer.com — 官网设计系统 main.css
   视觉基准：产品《前端设计规范 V2》 Indigo 渐变体系
   ===================================================== */

/* ---------- Tokens ---------- */
:root {
    --primary: #4F46E5;
    --primary-dark: #3730A3;
    --primary-darker: #1E1B4B;
    --primary-light: #818CF8;
    --primary-soft: #EEF2FF;
    --gradient: linear-gradient(135deg, #4F46E5, #7C3AED);
    --secondary: #10B981;
    --secondary-soft: #D1FAE5;
    --accent: #F59E0B;
    --bg: #F9FAFB;
    --card: #FFFFFF;
    --text: #111827;
    --text-2: #6B7280;
    --text-3: #9CA3AF;
    --border: #E5E7EB;
    --border-light: #F3F4F6;
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-primary: 0 4px 16px rgba(79, 70, 229, 0.30);
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text); background: var(--card); line-height: 1.7;
    font-size: 16px;
}
img, svg, video { display: block; max-width: 100%; }
a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }
h1, h2, h3, h4 { line-height: 1.3; letter-spacing: -0.01em; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
main { display: block; }

/* ---------- Nav ---------- */
.site-nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    transition: box-shadow 0.3s;
}
.site-nav.scrolled { box-shadow: var(--shadow-md); }
.site-nav .inner {
    max-width: 1100px; margin: 0 auto; padding: 0 24px;
    height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.site-nav .brand {
    display: flex; align-items: center; gap: 10px;
    font-size: 19px; font-weight: 700; color: var(--text); flex-shrink: 0;
}
.site-nav .brand img { width: 30px; height: 30px; }
.site-nav .brand:hover { color: var(--text); }
.site-nav .links { display: flex; gap: 26px; align-items: center; }
.site-nav .links a {
    font-size: 15px; color: var(--text-2); font-weight: 500; transition: color 0.2s;
}
.site-nav .links a:hover, .site-nav .links a.active { color: var(--primary); }
.site-nav .links a.nav-cta {
    color: #fff; background: var(--gradient);
    padding: 8px 18px; border-radius: var(--radius); font-weight: 600;
}
.site-nav .links a.nav-cta:hover { opacity: 0.92; color: #fff; }
.site-nav .menu-btn {
    display: none; width: 40px; height: 40px; border: none; background: none;
    cursor: pointer; border-radius: var(--radius-sm); color: var(--text);
}
.site-nav .menu-btn:hover { background: var(--border-light); }
.site-nav .menu-btn svg { width: 22px; height: 22px; margin: auto; }
.mobile-menu {
    display: none; position: fixed; top: 64px; left: 0; right: 0; z-index: 99;
    background: #fff; border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md); padding: 8px 24px 16px;
}
.mobile-menu.open { display: block; }
.mobile-menu a {
    display: block; padding: 12px 4px; font-size: 16px; color: var(--text);
    border-bottom: 1px solid var(--border-light);
}
.mobile-menu a:last-child { border: none; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 30px; border-radius: var(--radius); font-size: 16px;
    font-weight: 600; transition: all 0.25s; cursor: pointer; border: none;
    line-height: 1.4;
}
.btn-primary {
    background: var(--gradient); color: #fff; box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
    color: #fff; transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.38);
}
.btn-outline {
    background: transparent; color: var(--primary); border: 1.5px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-soft); transform: translateY(-2px); }
.btn-white { background: #fff; color: var(--primary-dark); }
.btn-white:hover { background: var(--primary-soft); color: var(--primary-dark); transform: translateY(-2px); }
.btn-lg { padding: 16px 36px; font-size: 17px; }
.btn-sm { padding: 9px 20px; font-size: 14px; }

/* ---------- Section ---------- */
.section { padding: 88px 0; }
.section-alt { background: var(--bg); }
.section-title { text-align: center; margin-bottom: 56px; }
.section-title h2 { font-size: 34px; font-weight: 700; margin-bottom: 12px; }
.section-title p { color: var(--text-2); font-size: 18px; max-width: 640px; margin: 0 auto; }
.section-title .eyebrow { display: none; }

/* ---------- Icon images（APP 线性图标适配） ---------- */
.li-ico { width: 20px; height: 20px; flex-shrink: 0; margin-top: 4px; }
.fd-card .icon-box img { width: 34px; height: 34px; }
.base-card .icon-box img { width: 28px; height: 28px; }
.scenario-card .sc-ico { display: block; margin-bottom: 14px; }
.side-ico { vertical-align: -4px; margin-right: 8px; }

/* ---------- Tag / Chip ---------- */
.tag {
    display: inline-block; padding: 3px 12px; border-radius: var(--radius-full);
    font-size: 12.5px; font-weight: 500;
    background: var(--primary-soft); color: var(--primary);
}
.tag-green { background: var(--secondary-soft); color: #059669; }
.tag-amber { background: #FEF3C7; color: #B45309; }
.tag-gray  { background: var(--border-light); color: var(--text-2); }

/* ---------- Cards ---------- */
.card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s, border-color 0.3s, transform 0.3s;
}
.card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary-light); }

/* ---------- Video slot ---------- */
.video-slot {
    position: relative; aspect-ratio: 16 / 9; max-width: 920px;
    margin: 0 auto; border-radius: var(--radius-lg); overflow: hidden;
    box-shadow: var(--shadow-lg); background: var(--primary-darker);
    cursor: pointer;
}
.video-slot img.video-poster { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.video-slot:hover img.video-poster { transform: scale(1.02); }
.video-slot .play-badge {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 84px; height: 84px; border-radius: 50%;
    background: rgba(255, 255, 255, 0.92); display: flex; align-items: center; justify-content: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35); transition: transform 0.3s var(--ease);
    pointer-events: none;
}
.video-slot:hover .play-badge { transform: translate(-50%, -50%) scale(1.08); }
.video-slot .play-badge::after {
    content: ''; display: block; margin-left: 6px;
    border-style: solid; border-width: 15px 0 15px 26px;
    border-color: transparent transparent transparent var(--primary);
}
.video-slot video { width: 100%; height: 100%; object-fit: cover; }
.video-caption { text-align: center; color: var(--text-3); font-size: 14px; margin-top: 14px; }

/* toast */
.toast {
    position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(20px);
    background: rgba(17, 24, 39, 0.88); color: #fff; padding: 12px 24px;
    border-radius: var(--radius-full); font-size: 14px; z-index: 200;
    opacity: 0; pointer-events: none; transition: all 0.3s var(--ease);
    backdrop-filter: blur(8px);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Business band（企业版条） ---------- */
.biz-band { background: var(--primary-darker); color: #fff; position: relative; overflow: hidden; }
.biz-band .inner {
    max-width: 1100px; margin: 0 auto; padding: 56px 24px;
    display: flex; align-items: center; justify-content: space-between; gap: 40px;
    position: relative; z-index: 1;
}
.biz-band .deco-net { position: absolute; right: -40px; top: -60px; width: 360px; opacity: 0.16; pointer-events: none; }
.biz-band .badge {
    display: inline-block; font-size: 12.5px; font-weight: 600; letter-spacing: 0.08em;
    background: rgba(255, 255, 255, 0.12); border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 4px 14px; border-radius: var(--radius-full); margin-bottom: 14px; color: #C7D2FE;
}
.biz-band h2 { font-size: 30px; font-weight: 700; margin-bottom: 10px; }
.biz-band p { color: rgba(255, 255, 255, 0.72); font-size: 16px; max-width: 620px; }
.biz-band .actions { flex-shrink: 0; display: flex; gap: 14px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-list details {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 0; overflow: hidden; transition: border-color 0.2s;
}
.faq-list details[open] { border-color: var(--primary-light); box-shadow: var(--shadow-sm); }
.faq-list summary {
    list-style: none; cursor: pointer; padding: 18px 56px 18px 22px;
    font-size: 16px; font-weight: 600; position: relative; user-select: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
    content: '+'; position: absolute; right: 22px; top: 50%; transform: translateY(-50%);
    font-size: 22px; font-weight: 400; color: var(--text-3); transition: transform 0.2s;
}
.faq-list details[open] summary::after { content: '−'; color: var(--primary); }
.faq-list .faq-a { padding: 0 22px 20px; color: var(--text-2); font-size: 15px; line-height: 1.9; }

/* ---------- Footer ---------- */
.site-footer { background: var(--primary-darker); color: #fff; padding: 64px 0 28px; }
.site-footer .cols {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 44px;
}
.site-footer .col h5 { font-size: 14px; margin-bottom: 16px; color: #C7D2FE; letter-spacing: 0.04em; }
.site-footer .col p, .site-footer .col a {
    display: block; font-size: 14px; color: rgba(255, 255, 255, 0.55); line-height: 2.1;
}
.site-footer .col a:hover { color: #fff; }
.site-footer .brand-col .brand-row { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.site-footer .brand-col .brand-row img { width: 34px; height: 34px; }
.site-footer .brand-col .brand-row span { font-size: 20px; font-weight: 700; }
.site-footer .brand-col .slogan { color: rgba(255, 255, 255, 0.55); font-size: 14px; line-height: 1.9; }
.site-footer .legal {
    border-top: 1px solid rgba(255, 255, 255, 0.12); padding-top: 22px;
    text-align: center; font-size: 13px; color: rgba(255, 255, 255, 0.4); line-height: 1.9;
}
.site-footer .legal a { color: rgba(255, 255, 255, 0.55); }
.site-footer .legal a:hover { color: #fff; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    html { scroll-behavior: auto; }
}

/* ---------- Hero ---------- */
.hero {
    position: relative; overflow: hidden;
    padding: 148px 0 72px; text-align: center;
    background:
        radial-gradient(900px 480px at 78% -10%, rgba(124, 58, 237, 0.10), transparent 60%),
        radial-gradient(700px 420px at 12% 8%, rgba(79, 70, 229, 0.08), transparent 55%),
        linear-gradient(180deg, #F9FAFB 0%, #EEF2FF 100%);
}
.hero-net {
    position: absolute; right: -70px; top: 30px; width: 520px; height: 520px;
    opacity: 0.30; pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 860px; }
.hero h1 { font-size: 50px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 22px; }
.hero h1 .highlight {
    background: var(--gradient);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent; color: transparent;
}
.hero .subtitle {
    font-size: 19px; color: var(--text-2); max-width: 720px;
    margin: 0 auto 36px; line-height: 1.9;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
    display: flex; gap: 56px; justify-content: center; margin-top: 56px; flex-wrap: wrap;
}
.hero-stats .num {
    font-size: 21px; font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent; color: transparent;
}
.hero-stats .label { font-size: 14px; color: var(--text-2); margin-top: 4px; }

/* ---------- Pain / Solution ---------- */
.ps-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.ps-col { padding: 34px 32px; border-radius: var(--radius-lg); }
.ps-col.pain { background: #FEF2F2; border: 1px solid #FECACA; }
.ps-col.pain h3 { color: #DC2626; font-size: 21px; margin-bottom: 16px; }
.ps-col.solution { background: var(--primary-soft); border: 1px solid rgba(79, 70, 229, 0.22); }
.ps-col.solution h3 { color: var(--primary); font-size: 21px; margin-bottom: 16px; }
.ps-col ul { list-style: none; }
.ps-col li {
    padding: 11px 0; border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    display: flex; gap: 12px; align-items: flex-start; font-size: 15px;
}
.ps-col li:last-child { border: none; }
.ps-col .icon { flex-shrink: 0; }

/* ---------- Feature cards ---------- */
.fd-grid { display: flex; flex-direction: column; gap: 26px; }
.fd-card {
    display: flex; gap: 36px; background: var(--card); padding: 36px;
    border-radius: var(--radius-lg); border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s, border-color 0.3s;
}
.fd-card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.fd-card .icon-box {
    width: 64px; height: 64px; border-radius: var(--radius-lg); flex-shrink: 0;
    background: var(--primary-soft); display: flex; align-items: center; justify-content: center;
    font-size: 30px;
}
.fd-card .content h3 { font-size: 21px; margin-bottom: 10px; }
.fd-card .content p { color: var(--text-2); font-size: 15px; line-height: 1.9; }
.fd-card .highlight-list { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.fd-card .highlight-list span {
    background: var(--primary-soft); color: var(--primary-dark);
    padding: 4px 14px; border-radius: var(--radius-full); font-size: 13px; font-weight: 500;
}

/* ---------- Flow ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; position: relative; }
.flow::after {
    content: ''; position: absolute; top: 32px; left: 12%; width: 76%; height: 2px; z-index: 0;
    background: repeating-linear-gradient(90deg, var(--primary-light) 0, var(--primary-light) 8px, transparent 8px, transparent 16px);
}
.flow-step { text-align: center; padding: 20px; position: relative; z-index: 1; }
.flow-step .num {
    width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 16px;
    background: var(--gradient); color: #fff; display: flex; align-items: center; justify-content: center;
    font-size: 23px; font-weight: 700; box-shadow: var(--shadow-primary);
}
.flow-step h4 { font-size: 16.5px; margin-bottom: 6px; }
.flow-step p { font-size: 14px; color: var(--text-2); }

/* ---------- Scenario teaser ---------- */
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.scenario-card {
    display: block; padding: 32px 28px; border-radius: var(--radius-lg);
    background: var(--card); border: 1px solid var(--border); color: var(--text);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s;
}
.scenario-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow-lg); transform: translateY(-3px); color: var(--text); }
.scenario-card .emoji { font-size: 34px; display: block; margin-bottom: 14px; }
.scenario-card h4 { font-size: 18px; margin-bottom: 8px; }
.scenario-card p { font-size: 14px; color: var(--text-2); line-height: 1.8; }
.scenario-card .more { display: inline-block; margin-top: 14px; color: var(--primary); font-size: 14px; font-weight: 600; }
.more-scenarios { text-align: center; margin-top: 40px; }

/* ---------- Download ---------- */
.download {
    background:
        radial-gradient(700px 360px at 85% 120%, rgba(124, 58, 237, 0.35), transparent 60%),
        var(--gradient);
    color: #fff;
}
.download h2 { font-size: 34px; font-weight: 700; margin-bottom: 12px; }
.dl-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.dl-text p { font-size: 17px; opacity: 0.88; }
.dl-text .dl-note { font-size: 14px; opacity: 0.65; margin-top: 8px; }
.qr-box {
    background: #fff; border-radius: var(--radius-lg); padding: 18px;
    display: flex; flex-direction: column; align-items: center; gap: 10px;
    box-shadow: var(--shadow-lg); flex-shrink: 0;
}

/* ---------- Responsive additions ---------- */
@media (max-width: 960px) {
    .hero h1 { font-size: 38px; }
    .hero-net { width: 380px; height: 380px; right: -120px; opacity: 0.2; }
    .ps-grid { grid-template-columns: 1fr; }
    .flow { grid-template-columns: 1fr 1fr; }
    .flow::after { display: none; }
    .scenario-grid { grid-template-columns: 1fr; }
    .fd-card { flex-direction: column; gap: 18px; padding: 26px; }
    .dl-inner { flex-direction: column; text-align: center; }
}
@media (max-width: 640px) {
    .hero { padding: 128px 0 56px; }
    .hero h1 { font-size: 30px; }
    .hero .subtitle { font-size: 16px; }
    .hero-stats { gap: 24px; margin-top: 40px; }
    .hero-stats .stat { min-width: 140px; }
    .flow { grid-template-columns: 1fr; }
    .ps-col { padding: 26px 22px; }
}

/* ---------- Subpages（features/scenarios/about/privacy/terms） ---------- */
.page-header {
    padding: 148px 0 52px; text-align: center;
    background:
        radial-gradient(800px 400px at 80% -20%, rgba(124, 58, 237, 0.10), transparent 60%),
        linear-gradient(180deg, #F9FAFB 0%, #EEF2FF 100%);
}
.page-header h1 { font-size: 40px; font-weight: 800; letter-spacing: -0.02em; }
.page-header p { color: var(--text-2); font-size: 18px; margin-top: 10px; }
.subpage { padding: 64px 0 80px; }
.prose { max-width: 860px; margin: 0 auto; padding: 0 20px; box-sizing: border-box; }
.prose h2 { font-size: 23px; margin: 42px 0 14px; }
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--text-2); font-size: 15.5px; line-height: 2; margin-bottom: 14px; }
.prose ul { color: var(--text-2); font-size: 15.5px; line-height: 2; padding-left: 22px; margin-bottom: 14px; }
.prose strong { color: var(--text); }
.prose .meta { font-size: 13px; color: var(--text-3); }
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 26px; }
.value-card {
    text-align: center; padding: 28px 16px; background: var(--card);
    border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
    transition: all 0.3s;
}
.value-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.value-card img { width: 40px; height: 40px; margin: 0 auto 12px; }
.value-card h4 { font-size: 16px; margin-bottom: 6px; }
.value-card p { font-size: 13.5px; color: var(--text-2); }
.feat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.feat-card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
    padding: 32px; box-shadow: var(--shadow-sm); transition: all 0.3s;
}
.feat-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow-lg); }
.feat-card .icon-box {
    width: 56px; height: 56px; border-radius: var(--radius);
    background: var(--primary-soft); display: flex; align-items: center; justify-content: center;
    font-size: 26px; margin-bottom: 18px;
}
.feat-card .icon-box img { width: 30px; height: 30px; }
.feat-card h3 { font-size: 19px; margin-bottom: 10px; }
.feat-card p { color: var(--text-2); font-size: 14.5px; line-height: 1.9; }
.feat-card .highlight-list { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.feat-card .highlight-list span {
    background: var(--primary-soft); color: var(--primary-dark);
    padding: 4px 14px; border-radius: var(--radius-full); font-size: 13px; font-weight: 500;
}
.scen-detail {
    display: flex; gap: 32px; background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 34px; box-shadow: var(--shadow-sm);
    transition: all 0.3s; margin-bottom: 22px;
}
.scen-detail:hover { border-color: var(--primary-light); box-shadow: var(--shadow-lg); }
.scen-detail .icon-box {
    width: 60px; height: 60px; border-radius: var(--radius-lg); flex-shrink: 0;
    background: var(--primary-soft); display: flex; align-items: center; justify-content: center;
}
.scen-detail .icon-box img { width: 32px; height: 32px; }
.scen-detail h3 { font-size: 20px; margin-bottom: 10px; }
.scen-detail .desc { color: var(--text-2); font-size: 15px; line-height: 1.95; }
.scen-detail .tags { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.contact-block {
    max-width: 820px; margin: 48px auto 0; background: var(--primary-soft);
    border: 1px solid rgba(79, 70, 229, 0.2); border-radius: var(--radius-lg); padding: 30px 34px;
}
.contact-block h3 { font-size: 18px; margin-bottom: 10px; }
.contact-block p { color: var(--text-2); font-size: 15px; line-height: 2; }
@media (max-width: 960px) {
    .page-header { padding: 128px 0 40px; }
    .page-header h1 { font-size: 32px; }
    .feat-grid { grid-template-columns: 1fr; }
    .values-grid { grid-template-columns: 1fr 1fr; }
    .scen-detail { flex-direction: column; gap: 16px; padding: 26px; }
}
@media (max-width: 640px) {
    .page-header { padding: 118px 0 36px; }
    .page-header h1 { font-size: 27px; }
    .values-grid { grid-template-columns: 1fr; }
}

/* ---------- Responsive base ---------- */
@media (max-width: 960px) {
    .site-nav .links { display: none; }
    .site-nav .menu-btn { display: flex; }
    .section { padding: 64px 0; }
    .section-title h2 { font-size: 28px; }
    .biz-band .inner { flex-direction: column; align-items: flex-start; padding: 48px 24px; }
    .site-footer .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
    .container { padding: 0 20px; }
    .section { padding: 52px 0; }
    .section-title h2 { font-size: 24px; }
    .section-title p { font-size: 16px; }
    .btn { width: 100%; }
    .hero-buttons { flex-direction: column; width: 100%; }
    .site-footer .cols { grid-template-columns: 1fr; gap: 28px; }
    .video-slot .play-badge { width: 64px; height: 64px; }
    .video-slot .play-badge::after { border-width: 11px 0 11px 19px; }
}
/* 企业版 / 咨询页特有样式（P1 附带，P2 充实） */

/* business hero */
.biz-hero {
    background:
        radial-gradient(900px 480px at 22% -10%, rgba(55, 48, 163, 0.35), transparent 60%),
        linear-gradient(180deg, #1E1B4B 0%, #312E81 55%, #4F46E5 130%);
}
.biz-hero .hero-inner { max-width: 980px; }
.biz-hero h1 { font-size: 44px; }
.biz-hero h1 { color: #fff; }
.biz-hero h1 .highlight {
    background: linear-gradient(135deg, #A5B4FC, #C4B5FD);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent; color: transparent;
}
.biz-hero .subtitle { color: rgba(255, 255, 255, 0.75); }
.biz-hero .btn-outline { color: #fff; border-color: rgba(255, 255, 255, 0.55); }
.biz-hero .btn-outline:hover { background: rgba(255, 255, 255, 0.12); }

/* base capability cards */
.base-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
}
.base-card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
    padding: 28px 26px; box-shadow: var(--shadow-sm); transition: all 0.3s;
}
.base-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.base-card .icon-box {
    width: 52px; height: 52px; border-radius: var(--radius);
    background: var(--primary-soft); display: flex; align-items: center; justify-content: center;
    font-size: 25px; margin-bottom: 16px;
}
.base-card h4 { font-size: 17px; margin-bottom: 8px; }
.base-card p { font-size: 14px; color: var(--text-2); line-height: 1.8; }

/* demo section */
.demo-inner {
    display: flex; align-items: center; gap: 56px; justify-content: space-between;
}
.demo-text { flex: 1; min-width: 0; }
.demo-text .section-title h2 { font-size: 28px; }
.demo-p { color: var(--text-2); font-size: 15.5px; line-height: 2; margin-bottom: 14px; }
.demo-cta { margin-top: 22px; }

/* customizable cards */
.cust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cust-card h4 { font-size: 17px; margin-bottom: 8px; }
.cust-card p { font-size: 14px; color: var(--text-2); line-height: 1.8; }

/* contact page */
.contact-wrap { display: grid; grid-template-columns: 1.5fr 1fr; gap: 40px; align-items: start; }
.contact-card-main {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
    padding: 36px; box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.form-field label .req { color: #DC2626; margin-left: 2px; }
.form-field input[type="text"], .form-field input[type="tel"], .form-field select, .form-field textarea {
    width: 100%; padding: 12px 14px; border: 1.5px solid var(--border);
    border-radius: var(--radius-sm); font-size: 15px; font-family: inherit;
    color: var(--text); background: #fff; transition: border-color 0.2s, box-shadow 0.2s;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
    outline: none; border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.18);
}
.form-field textarea { min-height: 110px; resize: vertical; }
.form-field .hint { font-size: 12.5px; color: var(--text-3); margin-top: 6px; }
.checks { display: flex; flex-wrap: wrap; gap: 10px; }
.checks label {
    display: inline-flex; align-items: center; gap: 7px; font-size: 14px; font-weight: 500;
    border: 1.5px solid var(--border); border-radius: var(--radius-full);
    padding: 8px 16px; cursor: pointer; transition: all 0.2s; margin: 0;
}
.checks label:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); color: var(--primary-dark); }
.checks input { accent-color: var(--primary); }
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }
.form-actions { margin-top: 26px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.form-note { font-size: 13px; color: var(--text-3); }

.contact-side .side-card {
    background: var(--primary-soft); border: 1px solid rgba(79, 70, 229, 0.2);
    border-radius: var(--radius-lg); padding: 26px; margin-bottom: 18px;
}
.contact-side .side-card h4 { font-size: 16px; margin-bottom: 10px; }
.contact-side .side-card p, .contact-side .side-card li {
    font-size: 14px; color: var(--text-2); line-height: 2;
}
.contact-side .side-card ul { list-style: none; }
.contact-side .side-card li b { color: var(--text); }

/* responsive */
@media (max-width: 960px) {
    .base-grid, .cust-grid { grid-template-columns: 1fr 1fr; }
    .contact-wrap { grid-template-columns: 1fr; }
    .demo-inner { flex-direction: column; text-align: center; }
    .demo-text .section-title { text-align: center !important; }
}
@media (max-width: 640px) {
    .base-grid, .cust-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .contact-card-main { padding: 24px; }
}