/* ============================================================
   web-google-cnzh.com.cn — Chrome 落地页样式
   设计风格：双色带渐变 + 卡片网格 + 极简导航
   ============================================================ */

:root {
    --blue: #1a73e8;
    --blue-dark: #0d5bba;
    --blue-light: #e8f0fe;
    --green: #1e8e3e;
    --red: #d93025;
    --yellow: #f29900;
    --text: #202124;
    --text-sub: #5f6368;
    --border: #e0e4ea;
    --bg: #f8f9fc;
    --white: #ffffff;
    --radius: 14px;
    --shadow: 0 2px 16px rgba(26,115,232,.10);
    --shadow-card: 0 4px 24px rgba(32,33,36,.09);
    --transition: .22s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

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

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; }
ul { list-style: none; }

/* ── 顶部提示条 ── */
.site-notice {
    background: linear-gradient(90deg, #1a73e8 0%, #0d5bba 100%);
    color: #fff;
    text-align: center;
    font-size: .83rem;
    padding: 9px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.site-notice a { color: #ffd54f; font-weight: 600; text-decoration: underline; }

/* ── 导航 ── */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,.97);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}
.nav-wrap {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text);
    flex-shrink: 0;
}
.nav-logo span { color: var(--blue); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-links a {
    padding: 7px 14px;
    border-radius: 8px;
    font-size: .92rem;
    color: var(--text-sub);
    transition: background var(--transition), color var(--transition);
}
.nav-links a:hover, .nav-links a.active { background: var(--blue-light); color: var(--blue); }
.nav-links .btn-nav-dl {
    background: var(--blue);
    color: #fff;
    border-radius: 8px;
    padding: 8px 20px;
    font-weight: 600;
    font-size: .92rem;
    transition: background var(--transition), transform var(--transition);
}
.nav-links .btn-nav-dl:hover { background: var(--blue-dark); transform: translateY(-1px); }

.nav-hamburger {
    display: none;
    background: none;
    border: none;
    padding: 6px;
    border-radius: 8px;
    color: var(--text);
}
.nav-hamburger:hover { background: var(--bg); }

.nav-mobile {
    display: none;
    flex-direction: column;
    background: var(--white);
    border-top: 1px solid var(--border);
    padding: 12px 24px 16px;
    gap: 4px;
}
.nav-mobile.show { display: flex; }
.nav-mobile a {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: .95rem;
    color: var(--text);
    transition: background var(--transition);
}
.nav-mobile a:hover { background: var(--bg); }
.nav-mobile .btn-nav-dl {
    background: var(--blue);
    color: #fff;
    text-align: center;
    font-weight: 600;
    margin-top: 4px;
}

/* ── 通用容器 ── */
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-sm { padding: 56px 0; }

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text);
    line-height: 1.3;
}
.section-sub {
    margin-top: 10px;
    color: var(--text-sub);
    font-size: 1.02rem;
    max-width: 600px;
}
.section-head { margin-bottom: 48px; }
.section-head.center { text-align: center; }
.section-head.center .section-sub { margin: 10px auto 0; }

/* ── Hero 首页 ── */
.hero {
    background: linear-gradient(135deg, #e8f0fe 0%, #f0f7ff 55%, #fff5e6 100%);
    padding: 90px 0 70px;
    overflow: hidden;
    position: relative;
}
.hero::before {
    content: '';
    position: absolute;
    top: -120px; right: -120px;
    width: 520px; height: 520px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(26,115,232,.08) 0%, transparent 70%);
    pointer-events: none;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(26,115,232,.1);
    color: var(--blue);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: .8rem;
    font-weight: 600;
    margin-bottom: 18px;
}
.hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--text);
    margin-bottom: 18px;
}
.hero h1 em {
    font-style: normal;
    background: linear-gradient(90deg, #1a73e8, #0d5bba);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-desc {
    color: var(--text-sub);
    font-size: 1.07rem;
    line-height: 1.75;
    margin-bottom: 32px;
    max-width: 480px;
}
.hero-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 36px;
}
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--blue);
    color: #fff;
    padding: 14px 28px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 700;
    border: none;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 16px rgba(26,115,232,.3);
}
.btn-primary:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 6px 24px rgba(26,115,232,.38); }
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--white);
    color: var(--blue);
    padding: 13px 24px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    border: 1.5px solid var(--blue);
    transition: background var(--transition), transform var(--transition);
}
.btn-secondary:hover { background: var(--blue-light); transform: translateY(-1px); }

.hero-stats {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}
.stat-item { display: flex; flex-direction: column; }
.stat-item strong { font-size: 1.4rem; font-weight: 800; color: var(--blue); }
.stat-item span { font-size: .8rem; color: var(--text-sub); }
.stat-divider { width: 1px; background: var(--border); align-self: stretch; }

/* Hero 右侧视觉 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}
.chrome-badge-wrap {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}
.chrome-ring {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(26,115,232,.12) 0%, rgba(52,168,83,.08) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.chrome-ring::after {
    content: '';
    position: absolute;
    inset: 16px;
    border-radius: 50%;
    border: 2px dashed rgba(26,115,232,.2);
}
.feature-pill {
    position: absolute;
    background: var(--white);
    border-radius: 10px;
    padding: 8px 14px;
    font-size: .78rem;
    font-weight: 600;
    color: var(--text);
    box-shadow: var(--shadow-card);
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}
.feature-pill.p1 { top: 20px; left: -20px; }
.feature-pill.p2 { top: 80px; right: -30px; }
.feature-pill.p3 { bottom: 80px; right: -20px; }
.feature-pill.p4 { bottom: 20px; left: -10px; }

/* ── 特性卡片 ── */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feat-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.feat-card:hover { box-shadow: var(--shadow-card); transform: translateY(-3px); border-color: #c5d8f5; }
.feat-icon {
    width: 52px; height: 52px;
    border-radius: 12px;
    background: var(--blue-light);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 18px;
}
.feat-card h3 { font-size: 1.06rem; font-weight: 700; margin-bottom: 10px; }
.feat-card p { color: var(--text-sub); font-size: .92rem; line-height: 1.65; }

/* ── 优势对比条 ── */
.compare-section { background: var(--bg); }
.compare-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.compare-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    border: 1px solid var(--border);
    transition: box-shadow var(--transition);
}
.compare-card:hover { box-shadow: var(--shadow-card); }
.compare-card.highlight { border-color: var(--blue); background: var(--blue-light); }
.compare-num { font-size: 2rem; font-weight: 800; color: var(--blue); }
.compare-card p { font-size: .88rem; color: var(--text-sub); margin-top: 6px; }
.compare-label { font-size: .78rem; font-weight: 600; color: var(--blue); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 4px; }

/* ── 平台特性列表 ── */
.platform-section { background: var(--white); }
.platform-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}
.platform-list { display: flex; flex-direction: column; gap: 16px; }
.platform-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.platform-icon {
    width: 40px; height: 40px; flex-shrink: 0;
    border-radius: 10px;
    background: var(--blue-light);
    display: flex; align-items: center; justify-content: center;
}
.platform-item h4 { font-size: .97rem; font-weight: 700; margin-bottom: 4px; }
.platform-item p { font-size: .88rem; color: var(--text-sub); }

.platform-visual {
    background: linear-gradient(135deg, #e8f0fe 0%, #f8f9ff 100%);
    border-radius: 20px;
    padding: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
}

/* ── 使用场景 ── */
.scene-section { background: var(--bg); }
.scene-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.scene-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 28px;
    border: 1px solid var(--border);
    transition: box-shadow var(--transition), transform var(--transition);
}
.scene-card:hover { box-shadow: var(--shadow-card); transform: translateY(-2px); }
.scene-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: .75rem;
    font-weight: 600;
    margin-bottom: 12px;
}
.scene-tag.blue { background: #e8f0fe; color: var(--blue); }
.scene-tag.green { background: #e6f4ea; color: var(--green); }
.scene-tag.red { background: #fce8e6; color: var(--red); }
.scene-tag.yellow { background: #fef3d9; color: #b06000; }
.scene-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.scene-card p { color: var(--text-sub); font-size: .88rem; line-height: 1.6; }

/* ── FAQ ── */
.faq-section { background: var(--white); }
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item.open { border-color: var(--blue); box-shadow: 0 2px 12px rgba(26,115,232,.1); }
.faq-q {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 22px;
    cursor: pointer;
    font-weight: 600;
    font-size: .97rem;
    background: var(--white);
    transition: background var(--transition);
    user-select: none;
}
.faq-q:hover { background: var(--bg); }
.faq-item.open .faq-q { background: var(--blue-light); color: var(--blue); }
.faq-arrow {
    flex-shrink: 0;
    transition: transform var(--transition);
    color: var(--text-sub);
}
.faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--blue); }
.faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s cubic-bezier(.4,0,.2,1), padding .25s;
    padding: 0 22px;
    color: var(--text-sub);
    font-size: .92rem;
    line-height: 1.75;
}
.faq-item.open .faq-a { max-height: 400px; padding: 14px 22px 18px; }

/* ── CTA 横幅 ── */
.cta-section {
    background: linear-gradient(135deg, #1a73e8 0%, #0d5bba 60%, #0a3d8a 100%);
    color: #fff;
    padding: 80px 0;
    text-align: center;
}
.cta-section h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800; margin-bottom: 14px; }
.cta-section p { font-size: 1.07rem; opacity: .88; margin-bottom: 32px; max-width: 540px; margin-left: auto; margin-right: auto; }
.btn-cta-white {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    color: var(--blue);
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 1.05rem;
    font-weight: 700;
    border: none;
    box-shadow: 0 4px 20px rgba(0,0,0,.18);
    transition: transform var(--transition), box-shadow var(--transition);
    text-decoration: none;
}
.btn-cta-white:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,.24); }

/* ── 页脚 ── */
.site-footer {
    background: #1c2128;
    color: rgba(255,255,255,.72);
    padding: 48px 0 28px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 1.05rem; margin-bottom: 12px; }
.footer-brand span { color: #7ba7f5; }
.footer-desc { font-size: .88rem; line-height: 1.7; max-width: 280px; }
.footer-col h4 { color: #fff; font-size: .9rem; font-weight: 700; margin-bottom: 14px; }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col ul a { font-size: .86rem; color: rgba(255,255,255,.62); transition: color var(--transition); }
.footer-col ul a:hover { color: #fff; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.1);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: .82rem;
    color: rgba(255,255,255,.45);
}
.footer-bottom a { color: rgba(255,255,255,.55); transition: color var(--transition); }
.footer-bottom a:hover { color: #fff; }

/* ═══════════════════════════════════════════════
   下载页专用样式
═══════════════════════════════════════════════ */

/* 下载页 Hero */
.dl-hero {
    background: linear-gradient(135deg, #0d5bba 0%, #1a73e8 50%, #2196f3 100%);
    color: #fff;
    padding: 80px 0 64px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.dl-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='20'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}
.dl-hero-inner { position: relative; z-index: 1; }
.dl-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,.15);
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 20px;
    padding: 5px 14px;
    font-size: .8rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #fff;
}
.dl-hero h1 {
    font-size: clamp(1.9rem, 4vw, 2.9rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 14px;
}
.dl-hero p {
    font-size: 1.05rem;
    opacity: .88;
    max-width: 560px;
    margin: 0 auto 32px;
    line-height: 1.7;
}
.dl-hero-quick {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}
.btn-dl-hero {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    color: var(--blue);
    border: none;
    padding: 14px 28px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(0,0,0,.2);
    transition: transform var(--transition), box-shadow var(--transition);
    cursor: pointer;
}
.btn-dl-hero:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,.28); }
.btn-dl-hero:disabled { opacity: .7; cursor: not-allowed; transform: none; }
.btn-dl-hero-ghost {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    color: #fff;
    border: 1.5px solid rgba(255,255,255,.5);
    padding: 13px 24px;
    border-radius: var(--radius);
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition);
}
.btn-dl-hero-ghost:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.8); }

/* Windows 焦点区 */
.win-section {
    background: var(--white);
    padding: 72px 0;
}
.win-card {
    background: linear-gradient(135deg, #e8f0fe 0%, #f0f7ff 100%);
    border-radius: 20px;
    padding: 48px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 40px;
    align-items: center;
    border: 2px solid rgba(26,115,232,.18);
    position: relative;
    overflow: hidden;
}
.win-card::before {
    content: '';
    position: absolute;
    top: -60px; right: -60px;
    width: 300px; height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(26,115,232,.07) 0%, transparent 70%);
    pointer-events: none;
}
.win-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--blue);
    color: #fff;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: .78rem;
    font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: .03em;
}
.win-card h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; margin-bottom: 10px; }
.win-card > .win-info > p { color: var(--text-sub); font-size: .97rem; line-height: 1.7; margin-bottom: 24px; }
.win-meta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}
.win-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: .86rem;
    color: var(--text-sub);
}
.win-meta-item svg { color: var(--blue); }
.btn-win-dl {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--blue);
    color: #fff;
    border: none;
    padding: 16px 36px;
    border-radius: var(--radius);
    font-size: 1.08rem;
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(26,115,232,.35);
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    cursor: pointer;
}
.btn-win-dl:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(26,115,232,.45); }
.btn-win-dl:disabled { opacity: .7; cursor: not-allowed; transform: none; }
.win-note { font-size: .8rem; color: var(--text-sub); margin-top: 10px; }
.win-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 12px;
    z-index: 1;
}

/* 其他平台下载 */
.other-dl-section { background: var(--bg); padding: 64px 0; }
.other-dl-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.other-dl-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: box-shadow var(--transition), border-color var(--transition);
}
.other-dl-card:hover { box-shadow: var(--shadow-card); border-color: #c5d8f5; }
.other-dl-card-head {
    display: flex;
    align-items: center;
    gap: 12px;
}
.other-dl-icon {
    width: 44px; height: 44px;
    border-radius: 10px;
    background: var(--blue-light);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.other-dl-card h3 { font-size: 1rem; font-weight: 700; }
.other-dl-card p { font-size: .86rem; color: var(--text-sub); line-height: 1.6; flex: 1; }
.btn-other-dl {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--blue-light);
    color: var(--blue);
    border: none;
    padding: 11px 20px;
    border-radius: 10px;
    font-size: .9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    width: 100%;
}
.btn-other-dl:hover { background: #d2e3fc; transform: translateY(-1px); }
.btn-other-dl:disabled { opacity: .65; cursor: not-allowed; transform: none; }

/* 下载步骤 */
.steps-section { background: var(--white); padding: 64px 0; }
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}
.steps-grid::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 15%;
    right: 15%;
    height: 2px;
    background: linear-gradient(90deg, var(--blue), #34a853);
    z-index: 0;
}
.step-card {
    background: var(--white);
    text-align: center;
    position: relative;
    z-index: 1;
}
.step-num {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    font-size: 1.2rem;
    font-weight: 800;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px;
    box-shadow: 0 4px 14px rgba(26,115,232,.3);
}
.step-card h4 { font-size: .97rem; font-weight: 700; margin-bottom: 6px; }
.step-card p { font-size: .85rem; color: var(--text-sub); }

/* 系统要求表格 */
.req-section { background: var(--bg); padding: 56px 0; }
.req-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.req-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 28px;
    border: 1px solid var(--border);
}
.req-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.req-list { display: flex; flex-direction: column; gap: 10px; }
.req-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    padding: 8px 0;
    border-bottom: 1px solid var(--bg);
    font-size: .9rem;
}
.req-row:last-child { border-bottom: none; }
.req-label { color: var(--text-sub); flex-shrink: 0; }
.req-value { font-weight: 600; text-align: right; }

/* 安全提示 */
.security-strip {
    background: #e6f4ea;
    border-radius: var(--radius);
    padding: 20px 28px;
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 32px;
}
.security-strip p { font-size: .9rem; color: #1e6831; }
.security-strip strong { font-weight: 700; }

/* ─── 帮助页专用 ─── */
.help-hero {
    background: linear-gradient(135deg, #f8f9fc 0%, #e8f0fe 100%);
    padding: 64px 0 48px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}
.help-hero h1 { font-size: clamp(1.7rem, 3.5vw, 2.5rem); font-weight: 800; margin-bottom: 10px; }
.help-hero p { color: var(--text-sub); font-size: 1rem; max-width: 520px; margin: 0 auto; }

.help-section { padding: 64px 0; }
.help-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}
.help-article { display: flex; flex-direction: column; gap: 20px; }
.help-block {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}
.help-block h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.help-block p, .help-block li { font-size: .91rem; color: var(--text-sub); line-height: 1.7; }
.help-block ul { padding-left: 0; display: flex; flex-direction: column; gap: 6px; }
.help-block ul li::before { content: '• '; color: var(--blue); font-weight: 700; }
.help-block ol { padding-left: 20px; display: flex; flex-direction: column; gap: 6px; }

/* ── 响应式 ── */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .compare-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .scene-grid { grid-template-columns: repeat(2, 1fr); }
    .other-dl-grid { grid-template-columns: repeat(2, 1fr); }
    .help-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-hamburger { display: flex; }
    .hero-grid { grid-template-columns: 1fr; gap: 32px; }
    .hero-visual { display: none; }
    .features-grid { grid-template-columns: 1fr; }
    .compare-grid { grid-template-columns: 1fr 1fr; }
    .platform-grid { grid-template-columns: 1fr; }
    .platform-visual { display: none; }
    .scene-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid::before { display: none; }
    .req-grid { grid-template-columns: 1fr; }
    .other-dl-grid { grid-template-columns: 1fr; }
    .win-card { grid-template-columns: 1fr; }
    .win-visual { display: none; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .section { padding: 56px 0; }
    .hero { padding: 60px 0 48px; }
    .dl-hero { padding: 56px 0 44px; }
}

@media (max-width: 480px) {
    .compare-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; }
    .hero-btns { flex-direction: column; }
    .dl-hero-quick { flex-direction: column; align-items: center; }
    .win-card { padding: 28px 20px; }
}