/* ==========================================================================
   产品介绍站样式（/intro）· 算数·海辕
   --------------------------------------------------------------------------
   为什么要单独一份 css：介绍站是对外的产品/招商页，与后台（app.css）和租户官网
   （site.css）不是同一套视觉语言 —— 后台讲效率，介绍站讲「这条链路走得通」。
   只用原生 CSS（不引外网框架），弱网与内网都能打开；配色用深海军蓝 + 亮蓝主色。
   ========================================================================== */

:root {
    --ip-ink: #0d1730;
    --ip-ink-2: #24344f;
    --ip-muted: #5c6c86;
    --ip-line: #e3eaf4;
    --ip-line-2: #eef3fa;
    --ip-bg: #ffffff;
    --ip-soft: #f4f8fd;
    --ip-card: #ffffff;
    --ip-brand: #123a8c;
    --ip-brand-2: #2563eb;
    --ip-accent: #0ea5a4;
    --ip-gold: #f0a020;
    --ip-dark: #0a1730;
    --ip-radius: 14px;
    --ip-shadow: 0 1px 2px rgba(13, 23, 48, .04), 0 10px 30px -18px rgba(13, 23, 48, .28);
    --ip-shadow-lg: 0 18px 50px -26px rgba(13, 23, 48, .45);
    --ip-wrap: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.ip {
    margin: 0;
    background: var(--ip-bg);
    color: var(--ip-ink);
    font-family: "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

body.ip a { color: inherit; }

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

.ip-skip {
    position: absolute; left: -9999px; top: 0;
    background: var(--ip-brand); color: #fff; padding: 10px 16px; z-index: 99;
}
.ip-skip:focus { left: 12px; top: 12px; }

.ip-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 22px; border-radius: 999px;
    font-size: 15px; font-weight: 600; text-decoration: none;
    border: 1px solid transparent; cursor: pointer;
    transition: transform .16s ease, box-shadow .16s ease, background .16s ease;
}
.ip-btn:hover { transform: translateY(-1px); }
.ip-btn-sm { padding: 9px 16px; font-size: 14px; }

.ip-btn-primary { background: var(--ip-brand-2); color: #fff; box-shadow: 0 12px 26px -14px rgba(37, 99, 235, .85); }
.ip-btn-primary:hover { background: #1d4ed8; }

.ip-btn-ghost { background: #fff; color: var(--ip-brand); border-color: #cddcf5; }
.ip-btn-ghost:hover { background: #f2f7ff; }

.ip-btn-light { background: #fff; color: var(--ip-brand); }
.ip-btn-ghost-light { background: rgba(255, 255, 255, .12); color: #fff; border-color: rgba(255, 255, 255, .38); }
.ip-btn-ghost-light:hover { background: rgba(255, 255, 255, .2); }

/* ---------------- 顶栏 ---------------- */

.ip-nav {
    position: sticky; top: 0; z-index: 40;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: saturate(160%) blur(10px);
    border-bottom: 1px solid var(--ip-line);
}
.ip-nav-in { display: flex; align-items: center; gap: 18px; height: 68px; }

.ip-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex: 0 0 auto; }
.ip-logo-mark {
    width: 34px; height: 34px; flex: 0 0 34px;
    display: grid; place-items: center;
    border-radius: 10px;
    background: linear-gradient(150deg, var(--ip-brand), var(--ip-brand-2));
    color: #fff; font-weight: 700; font-size: 17px;
}
.ip-logo-txt { display: flex; flex-direction: column; line-height: 1.25; }
.ip-logo-txt b { font-size: 16px; letter-spacing: .2px; }
.ip-logo-txt i { font-style: normal; font-size: 11.5px; color: var(--ip-muted); }

.ip-nav-links { display: flex; align-items: center; gap: 2px; margin-left: 8px; flex: 1 1 auto; }

/* 一级导航分组：组名 + 下拉细项。九项锚点铺平会把顶栏挤成一排小字，
   收成四组之后点组名直达首项，悬停或键盘聚焦才展开。 */
.ip-nav-group { position: relative; }
.ip-nav-group::after { content: ''; position: absolute; left: 0; right: 0; top: 100%; height: 12px; }
.ip-nav-top {
    display: flex; align-items: center; gap: 5px;
    padding: 8px 11px; border-radius: 8px;
    font-size: 14px; color: var(--ip-ink-2); text-decoration: none; white-space: nowrap;
}
.ip-nav-top .ip-caret { font-size: 9px; line-height: 1; opacity: .45; transition: transform .16s ease; }
.ip-nav-group:hover .ip-nav-top,
.ip-nav-group:focus-within .ip-nav-top { background: var(--ip-soft); color: var(--ip-brand); }
.ip-nav-group:hover .ip-caret,
.ip-nav-group:focus-within .ip-caret { transform: rotate(180deg); opacity: .85; }
.ip-menu {
    position: absolute; top: calc(100% + 8px); left: 0; z-index: 5;
    min-width: 176px; padding: 6px;
    background: #fff; border: 1px solid var(--ip-line); border-radius: 12px;
    box-shadow: 0 18px 40px -22px rgba(13, 23, 48, .45), 0 2px 6px rgba(13, 23, 48, .06);
    opacity: 0; visibility: hidden; transform: translateY(-6px);
    transition: opacity .16s ease, transform .16s ease, visibility .16s ease;
}
.ip-nav-group:hover .ip-menu,
.ip-nav-group:focus-within .ip-menu { opacity: 1; visibility: visible; transform: none; }
.ip-menu a {
    display: block; padding: 8px 10px; border-radius: 8px;
    font-size: 13.5px; color: var(--ip-ink-2); text-decoration: none; white-space: nowrap;
}
.ip-menu a:hover { background: var(--ip-soft); color: var(--ip-brand); }

.ip-nav-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }

.ip-langs { display: flex; align-items: center; background: var(--ip-soft); border-radius: 999px; padding: 3px; }
.ip-langs a {
    padding: 5px 11px; border-radius: 999px;
    font-size: 12.5px; color: var(--ip-muted); text-decoration: none; white-space: nowrap;
}
.ip-langs a.is-on { background: #fff; color: var(--ip-brand); font-weight: 700; box-shadow: 0 1px 3px rgba(13, 23, 48, .12); }

.ip-mnav { display: none; border-top: 1px solid var(--ip-line); }
.ip-mnav summary {
    list-style: none; cursor: pointer;
    padding: 12px 22px; font-weight: 600; font-size: 14px; color: var(--ip-brand);
}
.ip-mnav summary::-webkit-details-marker { display: none; }
.ip-mnav-body { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; padding: 0 16px 14px; }
.ip-mnav-body a { padding: 10px 12px; border-radius: 10px; background: var(--ip-soft); text-decoration: none; font-size: 14px; }
.ip-mnav-title {
    grid-column: 1 / -1; margin: 8px 2px -1px;
    font-size: 12px; font-weight: 700; letter-spacing: .04em; color: var(--ip-brand);
}

/* ---------------- Hero ---------------- */

.ip-hero {
    position: relative; overflow: hidden;
    background:
        radial-gradient(1100px 460px at 12% -12%, rgba(37, 99, 235, .20), transparent 62%),
        radial-gradient(760px 420px at 92% 6%, rgba(14, 165, 164, .18), transparent 60%),
        linear-gradient(180deg, #fbfdff 0%, var(--ip-soft) 100%);
    border-bottom: 1px solid var(--ip-line);
}
.ip-hero-in { padding: 74px 22px 58px; text-align: center; }

.ip-eyebrow {
    display: inline-block;
    padding: 6px 14px; border-radius: 999px;
    background: rgba(37, 99, 235, .09);
    border: 1px solid rgba(37, 99, 235, .18);
    color: var(--ip-brand); font-size: 13px; font-weight: 600;
}

.ip-hero h1 {
    margin: 20px 0 6px;
    font-size: clamp(38px, 6.4vw, 66px);
    line-height: 1.08; letter-spacing: -1px;
    background: linear-gradient(120deg, var(--ip-brand) 0%, var(--ip-brand-2) 55%, var(--ip-accent) 100%);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.ip-hero-sub { margin: 0 auto; max-width: 860px; font-size: clamp(16px, 2vw, 20px); font-weight: 600; color: var(--ip-ink-2); }
.ip-hero-lead { margin: 16px auto 0; max-width: 820px; font-size: 15.5px; color: var(--ip-muted); }

.ip-hero-cta { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
/* Hero 里的产品界面图：主图（驾驶舱）大、两张辅图小，做成「一主两副」的斜向叠放。
   图片是 tools/gen_intro_shots.php 生成的自制 SVG 截图，无外部依赖。 */
/* Hero 里的三张产品界面图：一主两副，按底边对齐排成「产品列阵」。
   这里不用 grid-row: span 2 让主图跨两行 —— 图片是固定宽高比、不能拉伸，
   跨行之后主图下方会剩下一大块空白，整块 hero 会显得头重脚轻。 */
.ip-shots {
    display: grid; grid-template-columns: 1.55fr 1fr .46fr;
    gap: 16px; align-items: end;
    max-width: 1080px; margin: 34px auto 0; padding-bottom: 8px;
}
.ip-shot { margin: 0; }
.ip-shot img {
    display: block; width: 100%; height: auto;
    border: 1px solid var(--ip-line); border-radius: 14px; background: #fff;
    box-shadow: 0 22px 48px -30px rgba(13, 23, 48, .42);
}
.ip-shot figcaption {
    margin-top: 9px; font-size: 12.5px; color: var(--ip-ink-3); text-align: center; letter-spacing: .01em;
}
/* 手机图本身是竖构图，列宽一放宽就会拖得比另两张高一截，所以要钉住上限 */
.ip-shot.is-phone { justify-self: center; max-width: 240px; }

.ip-hero-note { margin: 14px 0 0; font-size: 13px; color: var(--ip-muted); }

.ip-chain {
    display: flex; align-items: center; justify-content: center; flex-wrap: wrap;
    gap: 6px; margin: 34px auto 0; max-width: 980px;
}
.ip-chain-node {
    display: flex; align-items: center; gap: 8px;
    background: #fff; border: 1px solid var(--ip-line);
    border-radius: 999px; padding: 8px 15px 8px 8px;
    box-shadow: var(--ip-shadow);
    font-size: 13.5px;
}
.ip-chain-dot {
    width: 22px; height: 22px; flex: 0 0 22px; border-radius: 50%;
    display: grid; place-items: center;
    background: var(--ip-brand-2); color: #fff; font-size: 11.5px; font-weight: 700;
}
.ip-chain-line { width: 22px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, #c7d8f5, #a9c8f2); }

.ip-stats {
    display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px; margin-top: 40px; text-align: left;
}
.ip-stat {
    background: rgba(255, 255, 255, .82);
    border: 1px solid var(--ip-line);
    border-radius: var(--ip-radius);
    padding: 16px 18px;
    box-shadow: var(--ip-shadow);
}
.ip-stat b { display: block; font-size: 16px; color: var(--ip-brand); }
.ip-stat span { display: block; font-size: 13px; color: var(--ip-muted); margin-top: 2px; }

/* ---------------- 通用区块 ---------------- */

.ip-sec { padding: 68px 0; }
.ip-sec.is-soft { background: var(--ip-soft); border-top: 1px solid var(--ip-line); border-bottom: 1px solid var(--ip-line); }

.ip-sec-head { max-width: 860px; margin-bottom: 30px; }
.ip-sec-head h2 {
    margin: 0 0 8px;
    font-size: clamp(24px, 3.2vw, 34px);
    line-height: 1.2; letter-spacing: -.5px; color: var(--ip-ink);
}
.ip-sec-head p { margin: 0; color: var(--ip-muted); font-size: 15.5px; }

.ip-grid { display: grid; gap: 16px; }
.ip-grid.c2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.ip-grid.c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.ip-grid.c1 { grid-template-columns: 1fr; }

.ip-card {
    background: var(--ip-card); border: 1px solid var(--ip-line);
    border-radius: var(--ip-radius); padding: 22px;
    box-shadow: var(--ip-shadow);
}
.ip-card-icon { font-size: 20px; }
.ip-card h3 { margin: 10px 0 8px; font-size: 17px; }
.ip-card p { margin: 0; font-size: 14.5px; color: var(--ip-muted); }

/* ---------------- 业务链路 ---------------- */

.ip-flow { list-style: none; margin: 0; padding: 0; position: relative; }
.ip-step {
    position: relative;
    display: flex; gap: 18px;
    padding: 0 0 22px 0;
}
.ip-step:not(:last-child)::before {
    content: ""; position: absolute; left: 21px; top: 44px; bottom: 4px;
    width: 2px; background: linear-gradient(180deg, #cfe0f8, #e6eefb);
}
.ip-step-no {
    flex: 0 0 44px; width: 44px; height: 44px; border-radius: 12px;
    display: grid; place-items: center;
    background: #fff; border: 1px solid #cfe0f8;
    color: var(--ip-brand); font-weight: 700; font-size: 14px;
    box-shadow: var(--ip-shadow); z-index: 1;
}
.ip-step-body {
    flex: 1 1 auto; background: var(--ip-card);
    border: 1px solid var(--ip-line); border-radius: var(--ip-radius);
    padding: 18px 20px; box-shadow: var(--ip-shadow);
}
.ip-step-body h3 { margin: 0 0 6px; font-size: 17px; }
.ip-step-body p { margin: 0; font-size: 14.5px; color: var(--ip-muted); }

.ip-chips { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 12px; }
.ip-chip {
    font-size: 12.5px; padding: 4px 10px; border-radius: 999px;
    background: #f1f6ff; border: 1px solid #dbe7fb; color: #2a4a86;
}
.ip-flow-foot {
    margin: 6px 0 0; padding: 16px 20px;
    background: #f7faff; border: 1px dashed #c9dcf6; border-radius: var(--ip-radius);
    font-size: 14.5px; color: var(--ip-ink-2);
}

/* ---------------- 模块全景 ---------------- */

.ip-mod {
    background: var(--ip-card); border: 1px solid var(--ip-line);
    border-radius: var(--ip-radius); padding: 20px 22px; box-shadow: var(--ip-shadow);
}
.ip-mod h3 { display: flex; align-items: center; gap: 9px; margin: 0 0 10px; font-size: 16.5px; }
.ip-mod-icon { font-size: 17px; }
.ip-mod ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.ip-mod li { position: relative; padding-left: 16px; font-size: 14px; color: var(--ip-muted); }
.ip-mod li::before {
    content: ""; position: absolute; left: 2px; top: .65em;
    width: 6px; height: 6px; border-radius: 50%; background: var(--ip-accent);
}

/* ---------------- 核心能力（深色区） ---------------- */

.ip-sec.is-dark {
    background:
        radial-gradient(900px 420px at 88% 0%, rgba(37, 99, 235, .35), transparent 60%),
        linear-gradient(160deg, #0a1730 0%, #10244c 62%, #0b1c3c 100%);
    color: #eaf1ff;
}
.ip-sec.is-dark .ip-sec-head h2 { color: #fff; }
.ip-sec.is-dark .ip-sec-head p { color: #a9bedd; }

.ip-core {
    position: relative;
    background: rgba(255, 255, 255, .05);
    border: 1px solid rgba(255, 255, 255, .14);
    border-radius: var(--ip-radius);
    padding: 24px;
    backdrop-filter: blur(2px);
}
.ip-core-no {
    display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: 1px;
    color: #7fd7d3; margin-bottom: 8px;
}
.ip-core h3 { margin: 0 0 8px; font-size: 19px; color: #fff; }
.ip-core p { margin: 0; font-size: 14.5px; color: #c3d3ea; }
.ip-core ul { margin: 14px 0 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.ip-core li { position: relative; padding-left: 20px; font-size: 14px; color: #d7e3f6; }
.ip-core li::before {
    content: "✓"; position: absolute; left: 0; top: 0;
    color: #7fd7d3; font-size: 13px;
}

/* ---------------- 角色与多端 ---------------- */

.ip-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; align-items: start; }
.ip-col-title { margin: 0 0 12px; font-size: 17px; }

.ip-row-card {
    background: var(--ip-card); border: 1px solid var(--ip-line);
    border-radius: var(--ip-radius); padding: 16px 18px; box-shadow: var(--ip-shadow);
}
.ip-row-card h3 { margin: 0 0 4px; font-size: 15.5px; }
.ip-row-card p { margin: 0; font-size: 14px; color: var(--ip-muted); }
.ip-row-card.is-end { display: flex; gap: 12px; align-items: flex-start; }
.ip-end-icon { font-size: 19px; line-height: 1.4; }

/* ---------------- 客户与场景 ---------------- */

.ip-case {
    display: flex; gap: 14px; align-items: flex-start;
    background: var(--ip-card); border: 1px solid var(--ip-line);
    border-radius: var(--ip-radius); padding: 20px 22px; box-shadow: var(--ip-shadow);
}
.ip-case-icon { font-size: 22px; line-height: 1.3; }
.ip-case-body { flex: 1 1 auto; min-width: 0; }
.ip-case-body h3 { margin: 0 0 4px; font-size: 17px; }
.ip-case-who {
    display: inline-block; margin: 0 0 10px; padding: 3px 9px;
    border-radius: 999px; background: var(--ip-soft); border: 1px solid var(--ip-line);
    font-size: 12.5px; color: var(--ip-brand);
}
.ip-case-body > p { margin: 0; font-size: 14.5px; color: var(--ip-muted); }
.ip-case-body ul { margin: 12px 0 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.ip-case-body li { position: relative; padding-left: 18px; font-size: 14px; color: var(--ip-ink-2); }
.ip-case-body li::before {
    content: ""; position: absolute; left: 0; top: 8px; width: 7px; height: 7px;
    border-radius: 2px; background: var(--ip-brand-2);
}

.ip-lane {
    margin-top: 24px; background: #fff; border: 1px solid var(--ip-line);
    border-radius: var(--ip-radius); padding: 18px 22px 6px; box-shadow: var(--ip-shadow);
}
.ip-lane-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.ip-lane-list li { display: flex; gap: 12px; align-items: flex-start; padding-bottom: 12px; border-bottom: 1px solid var(--ip-line-2); }
.ip-lane-list li:last-child { border-bottom: 0; }
.ip-lane-no {
    flex: 0 0 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
    background: var(--ip-soft); color: var(--ip-brand); font-size: 13px; font-weight: 700;
}
.ip-lane-list b { font-size: 15px; color: var(--ip-ink); }
.ip-lane-list p { margin: 3px 0 0; font-size: 14px; color: var(--ip-muted); }
.ip-case-note { margin: 16px 0 0; font-size: 13px; color: var(--ip-muted); }

/* ---------------- 区域包 ---------------- */

.ip-pack { display: grid; gap: 16px; }
.ip-pack-lead { margin: 0; font-size: 15.5px; color: var(--ip-ink-2); }
.ip-pack-table {
    display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px;
    background: #fff; border: 1px solid var(--ip-line);
    border-radius: var(--ip-radius); padding: 6px 22px; box-shadow: var(--ip-shadow);
}
.ip-pack-row { display: flex; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--ip-line-2); }
.ip-pack-k { flex: 0 0 132px; color: var(--ip-muted); font-size: 13.5px; }
.ip-pack-v { flex: 1 1 auto; font-size: 14px; font-weight: 600; color: var(--ip-ink-2); }
.ip-pack-note { margin: 0; font-size: 14px; color: var(--ip-muted); }
.ip-pack-future {
    margin: 0; padding: 14px 18px; border-radius: var(--ip-radius);
    background: rgba(14, 165, 164, .08); border: 1px solid rgba(14, 165, 164, .22);
    font-size: 14px; color: #10615f;
}

/* ---------------- 演示 ---------------- */

.ip-demo { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.ip-demo-left, .ip-demo-right {
    background: var(--ip-card); border: 1px solid var(--ip-line);
    border-radius: var(--ip-radius); padding: 22px; box-shadow: var(--ip-shadow);
}
.ip-demo h3 { margin: 0 0 12px; font-size: 16px; }

.ip-demo-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.ip-demo-list li {
    display: flex; gap: 12px; align-items: baseline;
    padding-bottom: 8px; border-bottom: 1px dashed var(--ip-line);
    font-size: 14px;
}
.ip-demo-list li b { flex: 0 0 132px; color: var(--ip-ink); }
.ip-demo-list li span { color: var(--ip-muted); }

.ip-pass {
    display: flex; align-items: center; gap: 10px; margin-top: 14px;
    background: var(--ip-soft); border: 1px solid var(--ip-line);
    border-radius: 10px; padding: 10px 14px; font-size: 13.5px; color: var(--ip-muted);
}
.ip-pass code { font-size: 15px; font-weight: 700; color: var(--ip-brand); letter-spacing: .4px; }
.ip-demo-note { margin: 10px 0 0; font-size: 13px; color: var(--ip-muted); }

.ip-entry {
    display: grid; grid-template-columns: 1fr auto; align-items: center;
    gap: 4px 12px; padding: 14px 16px; margin-bottom: 10px;
    border: 1px solid var(--ip-line); border-radius: 12px;
    text-decoration: none; background: #fbfdff;
    transition: border-color .16s ease, transform .16s ease;
}
.ip-entry:hover { border-color: #b9d2f4; transform: translateY(-1px); }
.ip-entry b { font-size: 15px; color: var(--ip-brand); }
.ip-entry i { grid-row: 1 / span 2; font-style: normal; color: var(--ip-brand-2); font-size: 18px; }
.ip-entry span { grid-column: 1; font-size: 13.5px; color: var(--ip-muted); }

/* ---------------- FAQ ---------------- */

.ip-faq { display: grid; gap: 10px; max-width: 900px; }
.ip-faq-item {
    background: var(--ip-card); border: 1px solid var(--ip-line);
    border-radius: 12px; padding: 4px 18px; box-shadow: var(--ip-shadow);
}
.ip-faq-item summary {
    cursor: pointer; list-style: none;
    padding: 14px 0; font-weight: 600; font-size: 15.5px;
    display: flex; justify-content: space-between; gap: 14px;
}
.ip-faq-item summary::-webkit-details-marker { display: none; }
.ip-faq-item summary::after { content: "+"; color: var(--ip-brand-2); font-weight: 700; }
.ip-faq-item[open] summary::after { content: "–"; }
.ip-faq-item p { margin: 0 0 16px; font-size: 14.5px; color: var(--ip-muted); }

/* ---------------- 商务咨询 ---------------- */

.ip-cta {
    background:
        radial-gradient(700px 320px at 15% 0%, rgba(37, 99, 235, .38), transparent 62%),
        linear-gradient(160deg, #0a1730, #12306a);
    color: #fff; padding: 62px 0;
}
.ip-cta-in { display: flex; align-items: center; gap: 30px; }
.ip-cta-txt { flex: 1 1 auto; }
.ip-cta-txt h2 { margin: 0 0 10px; font-size: clamp(22px, 3vw, 30px); }
.ip-cta-txt p { margin: 0; color: #c5d6f0; font-size: 15px; max-width: 720px; }
.ip-cta-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.ip-cta-qr {
    flex: 0 0 auto; text-align: center;
    background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .2);
    border-radius: var(--ip-radius); padding: 14px;
}
.ip-cta-qr img { display: block; border-radius: 8px; background: #fff; }
.ip-cta-qr span { display: block; margin-top: 8px; font-size: 12.5px; color: #b9cbe8; }

.ip-sign {
    margin: 0; padding: 18px 22px; text-align: center;
    font-size: 12.5px; color: var(--ip-muted); background: var(--ip-soft);
}

/* ---------------- 页脚 ---------------- */

.ip-footer { background: #081226; color: #c6d4ea; padding: 46px 0 26px; }
.ip-foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 26px; }
.ip-foot-brand p { margin: 10px 0 0; font-size: 13.5px; color: #9fb2cf; max-width: 340px; }
.ip-foot-note { color: #7e93b4 !important; }
.ip-logo.is-foot .ip-logo-txt b { color: #fff; }
.ip-logo.is-foot .ip-logo-txt i { color: #93a8c8; }

.ip-foot-col h4 { margin: 0 0 12px; font-size: 14px; color: #fff; }
.ip-foot-col a { display: block; margin-bottom: 8px; font-size: 13.5px; color: #9fb2cf; text-decoration: none; }
.ip-foot-col a:hover { color: #fff; }
.ip-foot-qr { display: block; margin-top: 10px; border-radius: 8px; background: #fff; padding: 3px; }

.ip-foot-bottom {
    display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
    margin-top: 30px; padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, .12);
    font-size: 12.5px; color: #8ea3c3;
}
.ip-foot-bottom a { color: #cfe0f8; text-decoration: none; }
.ip-foot-bottom a:hover { text-decoration: underline; }

/* ---------------- 响应式 ---------------- */

@media (max-width: 1120px) {
    .ip-nav-links { display: none; }
    .ip-mnav { display: block; }
    .ip-nav-in { height: 62px; }
}

@media (max-width: 980px) {
    .ip-grid.c3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .ip-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .ip-demo { grid-template-columns: 1fr; }
    .ip-foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    /* 一主两副收成「主图 + 两张小图并排」，中间那列在窄屏放不下 */
    .ip-shots { grid-template-columns: 1fr 1fr; }
    /* 两列布局下主图独占一行；手机图钉住宽度，否则竖构图会被列宽拉到一张图占满屏 */
    .ip-shot.is-main { grid-column: 1 / -1; }
    .ip-shot.is-phone { grid-column: 2; justify-self: center; }
}

@media (max-width: 780px) {
    .ip-sec { padding: 50px 0; }
    .ip-hero-in { padding: 48px 22px 42px; }
    .ip-grid.c2, .ip-grid.c3 { grid-template-columns: 1fr; }
    .ip-cols { grid-template-columns: 1fr; }
    .ip-pack-table { grid-template-columns: 1fr; }
    .ip-cta-in { flex-direction: column; align-items: flex-start; }
    .ip-demo-list li { flex-direction: column; gap: 2px; }
    .ip-demo-list li b { flex: none; }
    .ip-chain-line { display: none; }
    .ip-chain { justify-content: flex-start; }
    .ip-shots { grid-template-columns: 1fr; }
    .ip-shot.is-main, .ip-shot.is-flow { grid-column: 1; justify-self: center; max-width: 100%; }
    .ip-shot.is-phone { grid-column: 1; justify-self: center; max-width: 240px; }
}

@media (max-width: 520px) {
    .ip-stats { grid-template-columns: 1fr; }
    .ip-foot-grid { grid-template-columns: 1fr; }
    .ip-langs a { padding: 5px 8px; font-size: 12px; }
    .ip-nav-right .ip-btn-sm { display: none; }
}

@media print {
    .ip-nav, .ip-mnav, .ip-cta, .ip-sign { display: none; }
    body.ip { background: #fff; }
}