/* ============================================================
   轻蝶官网全站样式（深蓝 + 白 · 科技感 · 响应式）
   ============================================================ */
:root {
    --brand: #2B6BF3;
    --brand-dark: #1B4FD1;
    --brand-soft: #EAF1FF;
    --navy: #0A1C3A;
    --navy-2: #0F2A52;
    --navy-3: #16386B;
    --bg: #F5F7FC;
    --line: #E3E8F2;
    --text: #1F2A3A;
    --muted: #6B778C;
    --white: #FFFFFF;
    --radius: 14px;
    --radius-lg: 20px;
    --shadow: 0 10px 30px rgba(15, 42, 82, .10);
    --shadow-sm: 0 4px 14px rgba(15, 42, 82, .08);
    --maxw: 1180px;
    --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--white);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
ul, ol { list-style: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- 通用组件 ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    height: 46px; padding: 0 26px; border-radius: 10px;
    font-size: 16px; font-weight: 600; cursor: pointer;
    border: 1px solid transparent; transition: all .18s ease;
    white-space: nowrap;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-1px); box-shadow: 0 8px 20px rgba(43, 107, 243, .35); }
.btn-ghost { background: rgba(255, 255, 255, .08); color: #fff; border-color: rgba(255, 255, 255, .45); }
.btn-ghost:hover { background: rgba(255, 255, 255, .16); }
.btn-outline { background: #fff; color: var(--brand); border-color: var(--brand); }
.btn-outline:hover { background: var(--brand-soft); }
.btn-light { background: #fff; color: var(--navy); }
.btn-light:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(0, 0, 0, .18); }
.btn-lg { height: 52px; padding: 0 34px; font-size: 17px; }
.btn-sm { height: 38px; padding: 0 18px; font-size: 14px; }

.tag {
    display: inline-block; padding: 2px 12px; border-radius: 999px;
    font-size: 13px; font-weight: 600; line-height: 1.8;
}
.tag-blue { background: var(--brand-soft); color: var(--brand-dark); }
.tag-green { background: #E8F7EF; color: #0E8C4A; }
.tag-orange { background: #FFF3E6; color: #C86A08; }

.section { padding: 84px 0; }
.section-alt { background: var(--bg); }
.section-navy { background: linear-gradient(160deg, var(--navy) 0%, var(--navy-2) 70%, var(--navy-3) 100%); color: #fff; }

.sec-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.sec-head h2 { font-size: 34px; line-height: 1.35; letter-spacing: .5px; }
.sec-head p { color: var(--muted); margin-top: 14px; font-size: 16.5px; }
.section-navy .sec-head p { color: #A9BBDA; }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
    padding: 30px 28px; transition: all .22s ease;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-3px); border-color: #D3DDF0; }
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15px; }
.card .icon {
    width: 52px; height: 52px; border-radius: 13px; background: var(--brand-soft);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; margin-bottom: 18px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(10, 28, 58, .92); backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.nav-wrap { display: flex; align-items: center; height: 68px; gap: 14px; }
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand img { width: 42px; height: 42px; border-radius: 10px; background: #fff; padding: 3px; }
.brand b { font-size: 21px; letter-spacing: 2px; }
.brand span { font-size: 12px; color: #9FB4D8; letter-spacing: .4px; display: block; line-height: 1.2; }

.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav a {
    color: #D8E2F5; padding: 9px 15px; border-radius: 9px;
    font-size: 15.5px; transition: all .16s ease;
}
.nav a:hover { color: #fff; background: rgba(255, 255, 255, .1); }
.nav a.on { color: #fff; background: rgba(43, 107, 243, .38); font-weight: 600; }

.nav .nav-cta {
    margin-left: 10px; background: var(--brand); color: #fff !important;
    padding: 9px 20px; font-weight: 600;
}
.nav .nav-cta:hover { background: var(--brand-dark); }

.nav-toggle {
    display: none; margin-left: auto; width: 44px; height: 44px;
    background: rgba(255, 255, 255, .1); border: 0; border-radius: 10px;
    cursor: pointer; position: relative;
}
.nav-toggle i, .nav-toggle i::before, .nav-toggle i::after {
    content: ""; position: absolute; left: 50%; top: 50%; width: 20px; height: 2px;
    background: #fff; border-radius: 2px; transform: translate(-50%, -50%);
    transition: all .2s ease;
}
.nav-toggle i::before { transform: translate(-50%, -7px); }
.nav-toggle i::after { transform: translate(-50%, 7px); }
body.nav-open .nav-toggle i { background: transparent; }
body.nav-open .nav-toggle i::before { transform: translate(-50%, 0) rotate(45deg); }
body.nav-open .nav-toggle i::after { transform: translate(-50%, 0) rotate(-45deg); }

/* ---------- Hero 主视觉 ---------- */
.hero {
    position: relative; overflow: hidden;
    background: linear-gradient(150deg, #0A1C3A 0%, #0F2A52 55%, #14386E 100%);
    color: #fff; padding: 92px 0 96px;
}
.hero::before, .hero::after {
    content: ""; position: absolute; border-radius: 50%; filter: blur(2px);
    background: radial-gradient(circle, rgba(43, 107, 243, .35), transparent 65%);
}
.hero::before { width: 620px; height: 620px; right: -160px; top: -240px; }
.hero::after { width: 460px; height: 460px; left: -180px; bottom: -260px; background: radial-gradient(circle, rgba(43, 107, 243, .22), transparent 65%); }
.hero .container { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1.12fr; gap: 54px; align-items: center; }
.hero h1 { font-size: 46px; line-height: 1.35; letter-spacing: 1px; }
.hero h1 .hl { color: #6FA3FF; }
.hero .sub { margin: 22px 0 10px; font-size: 18px; color: #C3D2EC; max-width: 560px; }
.hero .points { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 30px; }
.hero .points span {
    background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .16);
    padding: 5px 15px; border-radius: 999px; font-size: 14px; color: #DCE7FA;
}
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .note { margin-top: 18px; font-size: 13.5px; color: #8CA3C9; }

.hero-visual { position: relative; }
.hero-visual .phone {
    width: 100%; max-width: 620px; margin: 0 auto;
    border-radius: 18px; border: 6px solid #17233C; overflow: hidden;
    box-shadow: 0 30px 70px rgba(0, 0, 0, .5);
    background: #17233C;
}
/* hero 轮播：轻蝶系列产品图自动轮流展示（16:10 容器与产品卡保持一致） */
.hero-slider { position: relative; aspect-ratio: 16 / 10; background: #fff; }
.hero-slider > img {
    position: absolute; inset: 0; width: 100%; height: 100%;
    object-fit: cover; object-position: top center;
    opacity: 0; transition: opacity .75s ease;
}
.hero-slider > img.active { opacity: 1; }
.hs-dots {
    position: absolute; left: 50%; bottom: 10px; transform: translateX(-50%);
    display: flex; gap: 8px; z-index: 3;
}
.hs-dots b {
    width: 11px; height: 11px; border-radius: 6px; background: rgba(23, 35, 60, .38);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, .78), 0 1px 4px rgba(0, 0, 0, .22);
    cursor: pointer; transition: width .3s ease, background .3s ease;
}
.hs-dots b.on { width: 28px; background: var(--brand); }
.hero-visual .float-card {
    position: absolute; background: rgba(255, 255, 255, .96); color: var(--text);
    border-radius: 12px; padding: 12px 18px; box-shadow: 0 14px 34px rgba(0, 0, 0, .35);
    font-size: 13.5px; line-height: 1.5;
}
.hero-visual .fc1 { left: -8px; top: 16%; }
.hero-visual .fc2 { right: -4px; bottom: 14%; }
.hero-visual .float-card b { display: block; font-size: 15.5px; }
.hero-visual .fc1 b { color: #0E8C4A; }
.hero-visual .fc2 b { color: var(--brand); }

/* ---------- 数据带 ---------- */
.stats-band { background: var(--navy); color: #fff; padding: 34px 0; }
.stats-band .grid-4 { gap: 12px; text-align: center; }
.stats-band b { font-size: 30px; font-weight: 700; letter-spacing: .5px; }
.stats-band b em { font-style: normal; font-size: 17px; margin-left: 2px; color: #6FA3FF; }
.stats-band span { display: block; color: #9FB4D8; font-size: 14px; margin-top: 2px; }

/* ---------- 产品矩阵 ---------- */
.product-grid { grid-template-columns: repeat(3, 1fr); }
.pcard {
    background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
    overflow: hidden; display: flex; flex-direction: column; transition: all .22s ease;
}
.pcard:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.pcard .thumb { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: #E9EEF9; }
.pcard .thumb img { width: 100%; height: 100%; object-fit: cover; object-position: top center; transition: transform .4s ease; }
.pcard:hover .thumb img { transform: scale(1.035); }
.pcard .thumb .tag { position: absolute; left: 12px; top: 12px; backdrop-filter: blur(4px); }
.pcard .body { padding: 24px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.pcard h3 { font-size: 20px; margin-bottom: 8px; }
.pcard .desc { color: var(--muted); font-size: 14.5px; flex: 1; }
.pcard .feats { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 18px; }
.pcard .feats span { font-size: 12.5px; color: var(--navy-3); background: var(--bg); border: 1px solid var(--line); padding: 2px 10px; border-radius: 6px; }
.pcard .more { color: var(--brand); font-weight: 600; font-size: 15px; }
.pcard .more::after { content: " →"; transition: margin .2s; }
.pcard:hover .more::after { margin-left: 4px; }

.pcard.soon { background: linear-gradient(150deg, #F7F9FE, #EEF3FC); border-style: dashed; }
.pcard.soon .thumb { display: flex; align-items: center; justify-content: center; background: transparent; }
.pcard.soon .thumb .bigplus {
    width: 74px; height: 74px; border-radius: 50%; border: 2px dashed #B9C8E4;
    display: flex; align-items: center; justify-content: center;
    font-size: 34px; color: #9AAED2;
}

/* ---------- 功能/卖点列表 ---------- */
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.fl-item { display: flex; gap: 16px; padding: 22px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); }
.section-alt .fl-item { background: #fff; }
.fl-item .ic {
    flex: 0 0 46px; height: 46px; border-radius: 12px;
    background: var(--brand-soft); color: var(--brand-dark);
    display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.fl-item h3 { font-size: 16.5px; margin-bottom: 4px; }
.fl-item p { color: var(--muted); font-size: 14px; line-height: 1.65; }

/* ---------- 截图画廊 ---------- */
.shots { display: grid; gap: 26px; }
.shots-2 { grid-template-columns: repeat(2, 1fr); }
.shots-3 { grid-template-columns: repeat(3, 1fr); }
.shot { border-radius: 12px; overflow: hidden; border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow-sm); transition: all .22s ease; }
.shot:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.shot .bar { height: 30px; background: #F1F4FA; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 6px; padding: 0 12px; }
.shot .bar i { width: 9px; height: 9px; border-radius: 50%; background: #D6DEED; }
.shot .bar i:nth-child(1) { background: #F2B8B5; }
.shot .bar i:nth-child(2) { background: #F5D9A8; }
.shot .bar i:nth-child(3) { background: #B5DDC0; }
.shot .bar em { font-style: normal; font-size: 11.5px; color: #97A3BA; margin-left: 8px; }
.shot img { width: 100%; }
.shot .cap { padding: 12px 14px; font-size: 13.5px; color: var(--muted); border-top: 1px solid var(--line); background: #fff; }
.shot .cap b { color: var(--text); }

/* 手机截图（竖屏内容横屏打包） */
.shot-phone { border: none; box-shadow: none; background: transparent; }
.shot-phone .bar { display: none; }
.shot-phone img { border-radius: 10px; border: 1px solid var(--line); }

/* ---------- 步骤条 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px 24px; }
.step::before {
    counter-increment: step; content: "0" counter(step);
    position: absolute; top: 18px; right: 20px;
    font-size: 26px; font-weight: 800; color: #E4EBF8; letter-spacing: 1px;
}
.step h3 { font-size: 16.5px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14px; }

/* ---------- FAQ ---------- */
.faq { max-width: 860px; margin: 0 auto; }
.faq details {
    background: #fff; border: 1px solid var(--line); border-radius: 12px;
    margin-bottom: 12px; overflow: hidden;
}
.faq summary {
    cursor: pointer; list-style: none; padding: 18px 52px 18px 22px;
    font-weight: 600; font-size: 16px; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
    content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%);
    font-size: 22px; color: var(--brand); font-weight: 400; transition: transform .2s ease;
}
.faq details[open] summary::after { content: "−"; }
.faq .ans { padding: 0 22px 20px; color: var(--muted); font-size: 15px; }
.faq .ans p + p { margin-top: 8px; }

/* ---------- 咨询 / CTA 带 ---------- */
.cta-band {
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
    border-radius: var(--radius-lg); color: #fff; padding: 54px 56px;
    display: flex; align-items: center; gap: 40px; flex-wrap: wrap;
    box-shadow: 0 24px 60px rgba(27, 79, 209, .35);
}
.cta-band h2 { font-size: 30px; line-height: 1.4; }
.cta-band p { color: rgba(255, 255, 255, .85); margin-top: 10px; font-size: 15.5px; }
.cta-band .side { margin-left: auto; text-align: right; }
.cta-band .side .tel { font-size: 26px; font-weight: 700; letter-spacing: 1px; }
.cta-band .side .tip { font-size: 13px; color: rgba(255, 255, 255, .75); margin-top: 2px; }
.cta-band .actions { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }

/* ---------- 内页头 ---------- */
.page-hero {
    background: linear-gradient(150deg, #0A1C3A 0%, #0F2A52 60%, #14386E 100%);
    color: #fff; padding: 62px 0 58px; position: relative; overflow: hidden;
}
.page-hero::after {
    content: ""; position: absolute; width: 520px; height: 520px; right: -180px; top: -260px;
    border-radius: 50%; background: radial-gradient(circle, rgba(43, 107, 243, .3), transparent 65%);
}
.page-hero .container { position: relative; z-index: 2; }
.crumb { font-size: 13.5px; color: #93A8CC; margin-bottom: 14px; }
.crumb a { color: #93A8CC; }
.crumb a:hover { color: #fff; }
.page-hero h1 { font-size: 38px; letter-spacing: 1px; }
.page-hero .lead { color: #C3D2EC; font-size: 17px; margin-top: 14px; max-width: 780px; }
.page-hero .chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.page-hero .chips span {
    background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .18);
    padding: 4px 14px; border-radius: 999px; font-size: 13.5px; color: #DCE7FA;
}
.page-hero .actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

/* ---------- 对比表 / 规格表 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table.spec { width: 100%; border-collapse: collapse; min-width: 640px; font-size: 15px; }
table.spec th, table.spec td { padding: 15px 20px; text-align: left; border-bottom: 1px solid var(--line); }
table.spec th { background: #F7F9FD; font-weight: 600; white-space: nowrap; }
table.spec tr:last-child td { border-bottom: 0; }
table.spec td:first-child { color: var(--muted); width: 200px; }
table.spec .ok { color: #0E8C4A; font-weight: 600; }

/* ---------- 下载卡片 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.dl-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px 28px; display: flex; flex-direction: column; transition: all .22s ease; }
.dl-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.dl-card .top { display: flex; align-items: center; gap: 14px; margin-bottom: 6px; }
.dl-card .top img { width: 48px; height: 48px; border-radius: 12px; }
.dl-card .top .glyph {
    width: 48px; height: 48px; border-radius: 12px; background: var(--brand-soft);
    display: flex; align-items: center; justify-content: center; font-size: 24px;
}
.dl-card h3 { font-size: 19px; }
.dl-card .meta { color: var(--muted); font-size: 13px; margin-bottom: 14px; }
.dl-card .meta span + span::before { content: " · "; }
.dl-card ul { margin: 0 0 20px; flex: 1; }
.dl-card ul li { position: relative; padding-left: 20px; color: var(--muted); font-size: 14px; margin-bottom: 7px; }
.dl-card ul li::before { content: "✓"; position: absolute; left: 0; color: var(--brand); font-weight: 700; }
.dl-card .actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy); color: #A9BBDA; padding: 60px 0 0; font-size: 14.5px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 34px; padding-bottom: 44px; }
.site-footer .brand { color: #fff; margin-bottom: 14px; }
.site-footer .about { line-height: 1.85; }
.site-footer h4 { color: #fff; font-size: 15.5px; margin-bottom: 16px; letter-spacing: .5px; }
.site-footer .links a { display: block; color: #A9BBDA; padding: 5px 0; }
.site-footer .links a:hover { color: #fff; }
.site-footer .contact p { margin-bottom: 7px; }
.site-footer .contact b { color: #fff; }
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, .1); padding: 20px 0;
    display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-size: 13px; color: #7E93B8;
}
.footer-bottom .fill { flex: 1; }

/* ---------- 移动端 ---------- */
@media (max-width: 1024px) {
    .hero .container { grid-template-columns: 1fr; gap: 44px; }
    .hero h1 { font-size: 38px; }
    .hero-visual .phone { width: 88%; max-width: 500px; }
    .product-grid, .grid-3, .feature-list { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .dl-grid { grid-template-columns: 1fr; }
    .shots-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    body { font-size: 15.5px; }
    .section { padding: 60px 0; }
    .sec-head h2 { font-size: 27px; }
    .sec-head { margin-bottom: 36px; }
    .nav { display: none; }
    .nav-toggle { display: block; }
    body.nav-open .nav {
        display: flex; flex-direction: column; align-items: stretch;
        position: fixed; left: 0; right: 0; top: 68px; background: #0C2145;
        padding: 14px 18px 22px; gap: 4px; z-index: 99;
        border-bottom: 1px solid rgba(255, 255, 255, .1);
        box-shadow: 0 30px 60px rgba(0, 0, 0, .45);
    }
    body.nav-open .nav a { padding: 13px 16px; font-size: 16px; }
    .nav .nav-cta { margin-left: 0; margin-top: 8px; text-align: center; justify-content: center; display: flex; }
    .brand b { font-size: 19px; }
    .hero { padding: 64px 0 70px; }
    .hero h1 { font-size: 31px; }
    .hero .sub { font-size: 16px; }
    .hero-visual .float-card { display: none; }
    .stats-band b { font-size: 23px; }
    .product-grid, .grid-2, .grid-3, .grid-4, .feature-list, .steps, .shots-2, .shots-3, .footer-grid { grid-template-columns: 1fr; }
    .page-hero h1 { font-size: 29px; }
    .page-hero .lead { font-size: 15.5px; }
    .cta-band { padding: 36px 28px; }
    .cta-band h2 { font-size: 23px; }
    .cta-band .side { margin-left: 0; text-align: left; }
    .cta-band .side .tel { font-size: 22px; }
    .grid-4.stats-band .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .fl-item { padding: 18px; }
    .dl-card { padding: 24px 22px; }
}

@media (max-width: 520px) {
    .hero h1 { font-size: 27px; }
    .btn { height: 44px; padding: 0 20px; font-size: 15px; }
    .btn-lg { height: 48px; padding: 0 24px; font-size: 15.5px; }
    .hero .actions .btn { flex: 1; }
    .section { padding: 48px 0; }
}

/* ---------- 小工具类 ---------- */
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.mb-0 { margin-bottom: 0; }
.center { text-align: center; }
.muted { color: var(--muted); }
.small { font-size: 13.5px; }
.br-divider { height: 1px; background: var(--line); margin: 40px 0; border: 0; }