/* ============================================================
   鹰牛AI员工官网 · 设计系统
   延续鹰牛客户端深色科技风：
   bg #05070b/#090c13 · panel #0e1728 · primary #007aff · accent #00c9a7
   渐变 #1e7dff→#00c2a8 · text #e5e7eb/#9ca3af
   售前五页为 PPT 式全屏 scroll-snap；售后三页为常规滚动内容页。
   ============================================================ */

:root {
    --bg: #05070b;
    --bg-2: #090c13;
    --panel: #0e1728;
    --panel-2: #111c30;
    --primary: #007aff;
    --primary-hover: #3c9cff;
    --primary-deep: #0052c8;
    --accent: #00c9a7;
    --grad: linear-gradient(135deg, #1e7dff 0%, #00c2a8 100%);
    --text: #e5e7eb;
    --muted: #9ca3af;
    --line: rgba(148, 163, 184, .14);
    --radius: 14px;
    --shadow: 0 12px 40px rgba(0, 0, 0, .45);
    --nav-h: 64px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    padding-top: var(--nav-h);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button { font-family: inherit; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ================= 顶栏 ================= */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-h);
    z-index: 100;
    background: rgba(5, 7, 11, .82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}
.nav-inner { height: 100%; display: flex; align-items: center; gap: 28px; }
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-img { height: 30px; width: auto; }
.logo-text { font-size: 17px; font-weight: 700; letter-spacing: .5px; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; color: var(--muted); flex: 1; }
.nav-links a { transition: color .2s; white-space: nowrap; }
.nav-links a:hover, .nav-links a.on { color: var(--text); }
.nav-divider { width: 1px; height: 16px; background: var(--line); }
.nav-cta { flex-shrink: 0; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text); margin: 4px 0; transition: .3s; }

/* ================= 按钮 ================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all .2s;
    white-space: nowrap;
}
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-block { width: 100%; }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 6px 20px rgba(0, 122, 255, .3); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(0, 122, 255, .42); filter: brightness(1.06); }
.btn-ghost { border-color: var(--line); color: var(--text); background: rgba(14, 23, 40, .5); }
.btn-ghost:hover { border-color: var(--primary-hover); color: var(--primary-hover); }
.btn-lg { padding: 15px 38px; font-size: 17px; }

/* ================= PPT 式全屏页（售前） ================= */
.ppt-body { overflow-x: hidden; }
.ppt-wrap { scroll-snap-type: y mandatory; }
.slide {
    min-height: calc(100vh - var(--nav-h));
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 56px 0;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid rgba(148, 163, 184, .06);
}
.slide:nth-of-type(odd) { background: var(--bg); }
.slide:nth-of-type(even) { background: var(--bg-2); }

/* 滚动提示 */
.slide-hint {
    position: absolute;
    bottom: 18px; left: 50%;
    transform: translateX(-50%);
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 2px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    opacity: .7;
}
.slide-hint::after {
    content: "";
    width: 1px; height: 22px;
    background: linear-gradient(var(--primary-hover), transparent);
    animation: hintDrop 1.6s infinite;
}
@keyframes hintDrop { 0% { transform: scaleY(0); transform-origin: top; } 60% { transform: scaleY(1); } 100% { opacity: 0; } }

/* 进场动效（IntersectionObserver 加 .in-view；无 JS 时内容直接可见） */
.slide .fx, .fx {
    opacity: 1;
}
@media (prefers-reduced-motion: no-preference) {
    .fx { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
    .fx.in-view { opacity: 1; transform: none; }
    .fx-d1.in-view { transition-delay: .1s; }
    .fx-d2.in-view { transition-delay: .2s; }
    .fx-d3.in-view { transition-delay: .3s; }
}

/* ================= 排版件 ================= */
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 16px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--grad); }
.slide-title, .page-title {
    font-size: clamp(28px, 4.4vw, 46px);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: 1px;
    margin-bottom: 14px;
}
.grad-text {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.slide-sub { color: var(--muted); font-size: clamp(15px, 1.6vw, 18px); max-width: 720px; }

/* ================= Hero ================= */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    text-align: left;
}
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(60% 70% at 78% 30%, rgba(0, 122, 255, .16), transparent 60%),
        radial-gradient(45% 55% at 18% 75%, rgba(0, 201, 167, .10), transparent 60%);
    pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.2fr .8fr; gap: 48px; align-items: center; width: 100%; }
.hero-title {
    font-size: clamp(34px, 5.2vw, 58px);
    font-weight: 800;
    line-height: 1.22;
    letter-spacing: 1px;
    margin-bottom: 12px;
    white-space: pre-line;
}
.hero-kicker {
    display: inline-block;
    padding: 5px 14px;
    border: 1px solid rgba(0, 201, 167, .4);
    border-radius: 999px;
    color: var(--accent);
    font-size: 13px;
    letter-spacing: 1px;
    margin-bottom: 20px;
    background: rgba(0, 201, 167, .07);
}
.hero-descs { margin: 22px 0 30px; color: var(--muted); font-size: 16px; display: grid; gap: 10px; }
.hero-descs li { list-style: none; display: flex; gap: 10px; align-items: flex-start; }
.hero-descs .icon { color: var(--accent); width: 20px; height: 20px; flex-shrink: 0; margin-top: 4px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual {
    position: relative;
    border-radius: 20px;
    background: linear-gradient(160deg, var(--panel), #0a1220);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 26px;
    min-height: 320px;
}
.hero-visual::after {
    content: "";
    position: absolute;
    inset: -1px;
    border-radius: 20px;
    padding: 1px;
    background: var(--grad);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: .55;
    pointer-events: none;
}
.hv-row { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 14px; }
.hv-avatar {
    width: 36px; height: 36px;
    border-radius: 10px;
    background: var(--grad);
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 700;
}
.hv-bubble {
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 12px 16px;
    font-size: 13.5px;
    color: var(--text);
    line-height: 1.65;
}
.hv-bubble .dim { color: var(--muted); }
.hv-chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.hv-chip {
    font-size: 12px;
    color: var(--muted);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 4px 12px;
}

/* ================= 卡片 ================= */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
    background: linear-gradient(170deg, var(--panel), #0a1322);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px;
    transition: transform .25s, border-color .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-4px); border-color: rgba(60, 156, 255, .45); box-shadow: 0 14px 34px rgba(0, 0, 0, .4); }
.card-icon {
    width: 46px; height: 46px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0, 122, 255, .12);
    color: var(--primary-hover);
    margin-bottom: 16px;
}
.card-icon svg { width: 24px; height: 24px; }
.card h3 { font-size: 17px; margin-bottom: 6px; }
.card .card-tag { font-size: 12px; color: var(--accent); margin-bottom: 6px; display: block; }
.card p { color: var(--muted); font-size: 14px; }
.card .card-group { font-size: 12px; color: var(--muted); letter-spacing: 1px; margin-bottom: 8px; }

/* ================= 优势大字页 ================= */
.adv-row {
    display: grid;
    grid-template-columns: 90px 1fr 1.4fr;
    gap: 28px;
    align-items: center;
    padding: 30px 0;
    border-bottom: 1px solid var(--line);
}
.adv-row:last-child { border-bottom: 0; }
.adv-num { font-size: 44px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; opacity: .9; }
.adv-key { font-size: clamp(22px, 2.6vw, 30px); font-weight: 700; }
.adv-key small { display: block; font-size: 14px; color: var(--accent); font-weight: 500; margin-top: 4px; }
.adv-detail { color: var(--muted); font-size: 15px; }

/* ================= 对比表 ================= */
.compare-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
table.compare-table { width: 100%; border-collapse: collapse; min-width: 640px; }
.compare-table th, .compare-table td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14.5px; }
.compare-table thead th { background: rgba(0, 122, 255, .10); font-size: 15px; }
.compare-table thead th.self-col { color: #fff; background: var(--grad); font-weight: 700; }
.compare-table tbody tr:last-child td { border-bottom: 0; }
.compare-table .self-col { color: var(--accent); font-weight: 600; }
.compare-table tbody tr:hover { background: rgba(0, 122, 255, .05); }

/* ================= 路线图时间轴 ================= */
.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--primary), var(--accent)); opacity: .5; }
.tl-item { position: relative; padding-bottom: 30px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
    content: "";
    position: absolute;
    left: -28px; top: 8px;
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--grad);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, .18);
}
.tl-item.tl-doing::before { background: var(--primary-hover); animation: pulse 2s infinite; }
.tl-item.tl-plan::before { background: var(--muted); box-shadow: 0 0 0 4px rgba(156, 163, 175, .15); }
@keyframes pulse { 0%, 100% { box-shadow: 0 0 0 4px rgba(60, 156, 255, .18); } 50% { box-shadow: 0 0 0 8px rgba(60, 156, 255, .08); } }
.tl-phase { display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.tl-phase h3 { font-size: 19px; }
.tl-phase .tl-period { color: var(--accent); font-size: 13.5px; }
.tl-status { font-size: 12px; border-radius: 999px; padding: 2px 10px; border: 1px solid var(--line); color: var(--muted); }
.tl-item.tl-doing .tl-status { color: var(--primary-hover); border-color: rgba(60, 156, 255, .5); }
.tl-item.tl-plan .tl-status { color: var(--muted); }
.tl-items { margin-top: 10px; color: var(--muted); font-size: 14.5px; display: grid; gap: 6px; }
.tl-items li { list-style: none; display: flex; gap: 8px; align-items: flex-start; }
.tl-items .icon { width: 16px; height: 16px; color: var(--accent); flex-shrink: 0; margin-top: 4px; }

/* ================= 内容页（售后） ================= */
.page-head { padding: 64px 0 40px; }
.page-head .slide-sub { margin-top: 4px; }
.page-body { padding-bottom: 80px; }

/* 帮助中心：树 + 搜索 */
.help-layout { display: grid; grid-template-columns: 280px 1fr; gap: 32px; align-items: start; }
.help-side {
    position: sticky;
    top: calc(var(--nav-h) + 20px);
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    max-height: calc(100vh - var(--nav-h) - 40px);
    overflow-y: auto;
}
.help-search { display: flex; gap: 8px; margin-bottom: 14px; }
.help-search input {
    flex: 1;
    background: var(--bg-2);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 9px 12px;
    color: var(--text);
    font-size: 14px;
    outline: none;
}
.help-search input:focus { border-color: var(--primary); }
.help-tree h4 { font-size: 13px; color: var(--muted); letter-spacing: 1px; margin: 10px 0 4px; }
.help-tree a {
    display: block;
    padding: 7px 10px;
    border-radius: 8px;
    font-size: 14px;
    color: var(--muted);
    transition: .2s;
}
.help-tree a:hover, .help-tree a.on { color: var(--text); background: rgba(0, 122, 255, .12); }
.help-tree a.child { padding-left: 26px; }
.help-main { min-height: 400px; }
.doc-content {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 36px 40px;
    line-height: 1.9;
}
.doc-content h1, .doc-content h2 { margin: 24px 0 12px; }
.doc-content h1 { font-size: 26px; }
.doc-content h2 { font-size: 20px; border-left: 3px solid var(--primary); padding-left: 12px; }
.doc-content h3 { font-size: 17px; margin: 18px 0 8px; }
.doc-content p, .doc-content li { color: #c3c8d4; font-size: 15px; }
.doc-content ul, .doc-content ol { padding-left: 22px; margin: 10px 0; }
.doc-content img { border-radius: 10px; margin: 12px 0; border: 1px solid var(--line); }
.doc-content code { background: var(--bg-2); border: 1px solid var(--line); border-radius: 5px; padding: 1px 7px; font-size: 13.5px; color: var(--accent); }
.doc-content pre { background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: 16px; overflow-x: auto; margin: 14px 0; }
.doc-content pre code { border: 0; padding: 0; background: none; }
.doc-content blockquote { border-left: 3px solid var(--accent); padding: 6px 16px; color: var(--muted); margin: 12px 0; background: rgba(0, 201, 167, .05); border-radius: 0 8px 8px 0; }
.doc-content table { border-collapse: collapse; width: 100%; margin: 12px 0; }
.doc-content table th, .doc-content table td { border: 1px solid var(--line); padding: 8px 12px; font-size: 14px; }

/* FAQ 手风琴 */
.faq-item { border: 1px solid var(--line); border-radius: 12px; background: var(--panel); margin-bottom: 12px; overflow: hidden; }
.faq-q {
    width: 100%;
    background: none; border: 0;
    color: var(--text);
    font-size: 15.5px;
    font-weight: 600;
    padding: 18px 22px;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}
.faq-q .chev { transition: transform .25s; color: var(--muted); flex-shrink: 0; }
.faq-item.open .chev { transform: rotate(180deg); }
.faq-a { display: none; padding: 0 22px 18px; color: var(--muted); font-size: 14.5px; }
.faq-item.open .faq-a { display: block; }

/* ================= 表单 / 弹层 ================= */
.modal { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal[hidden] { display: none; }
.modal-mask { position: absolute; inset: 0; background: rgba(3, 5, 9, .78); backdrop-filter: blur(4px); }
.modal-box {
    position: relative;
    width: 460px;
    max-width: 100%;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    background: linear-gradient(170deg, var(--panel-2), var(--panel));
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 32px;
    box-shadow: var(--shadow);
}
.modal-close {
    position: absolute; top: 14px; right: 16px;
    background: none; border: 0;
    color: var(--muted); font-size: 26px; line-height: 1;
    cursor: pointer;
}
.modal-close:hover { color: var(--text); }
.modal-head h3 { font-size: 22px; margin-bottom: 6px; }
.modal-head p { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.modal-head b { color: var(--accent); }
#leadForm textarea, #leadForm input:not(.hp-field) {
    width: 100%;
    background: var(--bg-2);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 11px 14px;
    color: var(--text);
    font-size: 14.5px;
    outline: none;
    margin-bottom: 12px;
    font-family: inherit;
}
#leadForm textarea { resize: vertical; }
#leadForm input:focus, #leadForm textarea:focus { border-color: var(--primary); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-captcha { grid-template-columns: 1fr 110px; align-items: center; }
.captcha-img { height: 42px; border-radius: 8px; cursor: pointer; border: 1px solid var(--line); background: #fff; }
.hp-field { position: absolute; left: -9999px; height: 0; width: 0; opacity: 0; }
.form-msg { min-height: 20px; font-size: 13.5px; margin: 4px 0; }
.form-msg.ok { color: var(--accent); }
.form-msg.err { color: #f87171; }
.form-tip { color: var(--muted); font-size: 12px; line-height: 1.6; margin-top: 10px; }

/* ================= 工单页 ================= */
.ticket-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.ticket-form-card, .ticket-query-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 32px;
}
.ticket-form-card h3, .ticket-query-card h3 { font-size: 19px; margin-bottom: 18px; }
.ticket-form-card select, .ticket-form-card input, .ticket-form-card textarea,
.ticket-query-card input {
    width: 100%;
    background: var(--bg-2);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 11px 14px;
    color: var(--text);
    font-size: 14.5px;
    outline: none;
    margin-bottom: 12px;
    font-family: inherit;
}
.ticket-form-card select:focus, .ticket-form-card input:focus, .ticket-form-card textarea:focus,
.ticket-query-card input:focus { border-color: var(--primary); }
.ticket-form-card textarea { resize: vertical; min-height: 120px; }
.ticket-result {
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--bg-2);
    padding: 18px;
    font-size: 14px;
    margin-top: 14px;
    display: none;
}
.ticket-result.show { display: block; }
.ticket-result .tr-status { display: inline-block; padding: 2px 12px; border-radius: 999px; font-size: 12.5px; border: 1px solid rgba(60, 156, 255, .5); color: var(--primary-hover); margin-bottom: 10px; }
.ticket-result .tr-line { color: var(--muted); margin-top: 6px; word-break: break-all; }
.ticket-result .tr-line b { color: var(--text); font-weight: 600; }

/* ================= 支持页 ================= */
.support-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.support-card { text-align: center; padding: 36px 26px; }
.support-card .card-icon { margin: 0 auto 18px; width: 56px; height: 56px; }
.support-card .card-icon svg { width: 28px; height: 28px; }
.support-card img.qr { width: 150px; height: 150px; border-radius: 12px; margin: 14px auto 0; display: block; border: 1px solid var(--line); }

/* ================= CTA 条 ================= */
.cta-band {
    background:
        radial-gradient(70% 100% at 20% 20%, rgba(0, 122, 255, .18), transparent 55%),
        radial-gradient(60% 90% at 85% 80%, rgba(0, 201, 167, .14), transparent 55%),
        var(--panel);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 46px 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}
.cta-band h3 { font-size: clamp(20px, 2.6vw, 28px); margin-bottom: 6px; }
.cta-band p { color: var(--muted); }

/* ================= Footer ================= */
.footer { border-top: 1px solid var(--line); background: var(--bg); padding: 56px 0 28px; margin-top: 0; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.1fr; gap: 36px; padding-bottom: 32px; }
.footer-col h4 { font-size: 14px; letter-spacing: 1px; color: var(--text); margin-bottom: 14px; }
.footer-col a { display: block; color: var(--muted); font-size: 14px; padding: 4px 0; transition: color .2s; }
.footer-col a:hover { color: var(--primary-hover); }
.footer-brand .footer-logo { height: 34px; margin-bottom: 14px; }
.footer-brand strong { display: block; font-size: 15px; }
.footer-desc { color: var(--muted); font-size: 13.5px; margin-top: 6px; }
.footer-phone { display: flex; align-items: center; gap: 8px; color: var(--text); font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.footer-phone svg { width: 18px; height: 18px; color: var(--accent); }
.footer-meta {
    display: flex;
    gap: 18px;
    align-items: center;
    flex-wrap: wrap;
    color: var(--muted);
    font-size: 12.5px;
    border-top: 1px solid var(--line);
    padding-top: 20px;
}
.footer-link { color: var(--muted); }
.footer-link:hover { color: var(--primary-hover); }

/* ================= 悬浮客服 ================= */
.kefu { position: fixed; right: 22px; bottom: 90px; z-index: 90; }
.kefu-fab {
    display: flex; flex-direction: column; align-items: center; gap: 2px;
    background: var(--grad);
    color: #fff;
    border: 0; border-radius: 14px;
    padding: 12px 10px;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(0, 122, 255, .35);
    font-size: 12px;
}
.kefu-fab svg { width: 22px; height: 22px; }
.kefu-pop {
    position: absolute;
    right: 60px; bottom: 0;
    width: 190px;
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
    text-align: center;
    font-size: 13px;
    color: var(--muted);
    display: none;
    box-shadow: var(--shadow);
}
.kefu-pop.show { display: block; }
.kefu-qr { width: 150px; height: 150px; border-radius: 10px; margin-bottom: 8px; }

/* ================= 404 ================= */
.nf { text-align: center; padding: 120px 0; }
.nf h1 { font-size: 72px; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nf p { color: var(--muted); margin: 12px 0 24px; }

/* ================= 响应式 ================= */
@media (max-width: 960px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .hero-grid { grid-template-columns: 1fr; }
    .hero-visual { display: none; }
    .help-layout { grid-template-columns: 1fr; }
    .help-side { position: static; max-height: none; }
    .ticket-grid { grid-template-columns: 1fr; }
    .support-grid { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .adv-row { grid-template-columns: 60px 1fr; }
    .adv-detail { grid-column: 2; }
}
@media (max-width: 640px) {
    .nav-links {
        position: fixed;
        top: var(--nav-h); left: 0; right: 0;
        background: rgba(5, 7, 11, .97);
        flex-direction: column;
        align-items: flex-start;
        padding: 18px 24px 24px;
        gap: 14px;
        border-bottom: 1px solid var(--line);
        display: none;
    }
    .nav-links.open { display: flex; }
    .nav-divider { display: none; }
    .nav-toggle { display: block; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .form-captcha { grid-template-columns: 1fr 100px; }
    .slide { padding: 40px 0; }
    .cta-band { padding: 32px 24px; }
    .doc-content { padding: 26px 20px; }
    .footer-inner { grid-template-columns: 1fr; gap: 24px; }
}