/* ============================================================
   Known 官网 · 样式
   ------------------------------------------------------------
   1. 设计令牌（深 / 浅双主题）
   2. 基础与排版
   3. 通用件（容器 / 按钮 / 徽标 / 图标 / 动效）
   4. 顶栏与页脚
   5. 首页：Hero、数据条、能力矩阵、代码窗、宿主、上手步骤、收尾
   6. 更新日志：时间轴 + 分类筛选
   7. 路线图：三列看板
   8. 响应式
   ============================================================ */

/* ---------- 1. 设计令牌 ----------
   取值直接对齐框架 Known/wwwroot/css/web.css 的令牌，保证官网与产品是同一套配色：
   主色 #2F5BFF（暗色下提亮为 #5B7CFF），品牌渐变 #2F5BFF → #7C5CFF（与 favicon 同源），
   背景 / 面板 / 边框取框架的 --bg-app / --bg-card / --border-color。 */
:root,
[data-theme='dark'] {
    color-scheme: dark;

    --bg: #090E18;
    --bg-2: #0B1220;
    --panel: #111A2B;
    --panel-2: #0D1626;
    --line: #1D2A41;
    --line-2: #283A58;

    --text: #E9EFF9;
    --text-2: #B7C4DB;
    --text-3: #8493AD;

    --brand: #5B7CFF;
    --brand-2: #7C5CFF;
    --brand-3: #38BDF8;
    --brand-soft: rgba(91, 124, 255, .16);
    --brand-line: rgba(91, 124, 255, .42);

    --ok: #34D399;
    --ok-soft: rgba(52, 211, 153, .12);
    --warn: #FBB03B;
    --warn-soft: rgba(251, 176, 59, .12);
    --danger: #FF6E9C;
    --danger-soft: rgba(255, 110, 156, .12);

    --grad: linear-gradient(100deg, #5B7CFF 0%, #6D7BFF 55%, #8B6BFF 100%);
    --grad-soft: linear-gradient(120deg, rgba(91, 124, 255, .18), rgba(124, 92, 255, .14));

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .5);
    --shadow-md: 0 18px 40px -24px rgba(0, 0, 0, .9);
    --shadow-lg: 0 50px 120px -50px rgba(0, 0, 0, 1);

    --radius-sm: 10px;
    --radius: 16px;
    --radius-lg: 22px;

    --nav-h: 66px;
    --ease: cubic-bezier(.22, .61, .36, 1);
}

[data-theme='light'] {
    color-scheme: light;

    --bg: #F4F7FC;
    --bg-2: #EFF3FA;
    --panel: #FFFFFF;
    --panel-2: #F7F9FD;
    --line: #E4EAF3;
    --line-2: #D3DDEC;

    --text: #0B1424;
    --text-2: #2A3752;
    --text-3: #61708C;

    --brand: #2F5BFF;
    --brand-2: #7C5CFF;
    --brand-3: #0EA5E9;
    --brand-soft: rgba(47, 91, 255, .08);
    --brand-line: rgba(47, 91, 255, .3);

    --ok: #12B76A;
    --ok-soft: rgba(18, 183, 106, .1);
    --warn: #E08A00;
    --warn-soft: rgba(224, 138, 0, .1);
    --danger: #F0568A;
    --danger-soft: rgba(240, 86, 138, .1);

    --grad: linear-gradient(100deg, #2F5BFF 0%, #4B63FF 55%, #6B5CFF 100%);
    --grad-soft: linear-gradient(120deg, rgba(47, 91, 255, .12), rgba(124, 92, 255, .1));

    --shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);
    --shadow-md: 0 16px 36px -22px rgba(16, 24, 40, .28);
    --shadow-lg: 0 40px 90px -50px rgba(16, 24, 40, .35);
}

/* ---------- 2. 基础与排版 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-h) + 20px);
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: 'Plus Jakarta Sans', 'Inter', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 15px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    transition: background .3s var(--ease), color .3s var(--ease);
}

h1, h2, h3, h4 {
    margin: 0;
    line-height: 1.22;
    letter-spacing: -.02em;
    font-weight: 700;
}

p { margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; }

::selection { background: var(--brand); color: #fff; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 99px; border: 3px solid var(--bg); }
    ::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 3px;
    border-radius: 6px;
}

/* ---------- 3. 通用件 ---------- */
.wrap {
    width: 100%;
    max-width: 1180px;
    margin-inline: auto;
    padding-inline: 24px;
}

.section { padding: clamp(64px, 9vw, 116px) 0; position: relative; }
    .section.tight { padding: clamp(48px, 6vw, 76px) 0; }

.kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--brand-2);
}

.section-head { max-width: 720px; margin-bottom: clamp(32px, 4vw, 52px); }
    .section-head h2 {
        font-size: clamp(26px, 3.4vw, 40px);
        margin: 14px 0 14px;
    }
    .section-head p {
        color: var(--text-2);
        font-size: clamp(14.5px, 1.2vw, 16.5px);
    }
    .section-head.center { margin-inline: auto; text-align: center; }
    .section-head.row {
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
        gap: 24px;
        max-width: none;
    }

.grad {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 46px;
    padding: 0 22px;
    border-radius: 12px;
    border: 1px solid transparent;
    font-size: 14.5px;
    font-weight: 600;
    white-space: nowrap;
    cursor: pointer;
    transition: transform .18s var(--ease), background .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease), color .2s var(--ease);
}
    .btn:active { transform: translateY(1px); }

.btn-primary {
    background: var(--brand);
    color: #fff;
    box-shadow: 0 12px 30px -14px rgba(47, 91, 255, .85);
}
    .btn-primary:hover {
        background: color-mix(in srgb, var(--brand) 86%, white);
        box-shadow: 0 16px 38px -14px rgba(47, 91, 255, 1);
        transform: translateY(-1px);
    }

.btn-ghost {
    background: transparent;
    border-color: var(--line-2);
    color: var(--text);
}
    .btn-ghost:hover { border-color: var(--brand-line); background: var(--brand-soft); }

.btn-sm { height: 38px; padding: 0 16px; font-size: 13.5px; border-radius: 10px; }
.btn-lg { height: 52px; padding: 0 28px; font-size: 15px; }

/* 徽标 / 标签 */
.pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 21px;
    padding: 0 8px;
    border-radius: 99px;
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: .02em;
    border: 1px solid var(--line-2);
    color: var(--text-2);
    background: var(--panel-2);
}
.pill-live {
    color: var(--brand-2);
    border-color: var(--brand-line);
    background: var(--brand-soft);
}
    .pill-live::before {
        content: '';
        width: 5px;
        height: 5px;
        border-radius: 99px;
        background: currentColor;
        box-shadow: 0 0 0 3px color-mix(in srgb, currentColor 22%, transparent);
        animation: pulse 2.4s var(--ease) infinite;
    }

.chip {
    display: inline-flex;
    align-items: center;
    height: 24px;
    padding: 0 10px;
    border-radius: 7px;
    border: 1px solid var(--line-2);
    background: var(--panel-2);
    color: var(--text-2);
    font-size: 12px;
    font-weight: 600;
}

/* 图标 */
.ico { width: 18px; height: 18px; flex: none; }
.ico-xs { width: 13px; height: 13px; }
.ico-sm { width: 15px; height: 15px; }
.ico-lg { width: 22px; height: 22px; }

/* 入场动效 */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .7s var(--ease), transform .7s var(--ease);
    will-change: opacity, transform;
}
    .reveal.in { opacity: 1; transform: none; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: .35; }
}

@keyframes floaty {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes aurora {
    0% { transform: translate3d(-6%, -4%, 0) scale(1); }
    50% { transform: translate3d(5%, 3%, 0) scale(1.08); }
    100% { transform: translate3d(-6%, -4%, 0) scale(1); }
}

/* 滚动进度条 */
.scroll-progress {
    position: fixed;
    inset: 0 auto auto 0;
    height: 2px;
    width: 0;
    z-index: 60;
    background: var(--grad);
    transition: width .08s linear;
}

/* ---------- 4. 顶栏 ---------- */
.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--nav-h);
    backdrop-filter: saturate(180%) blur(14px);
    background: color-mix(in srgb, var(--bg) 72%, transparent);
    border-bottom: 1px solid transparent;
    transition: border-color .2s var(--ease), background .2s var(--ease);
}
    .nav.scrolled {
        border-bottom-color: var(--line);
        background: color-mix(in srgb, var(--bg) 88%, transparent);
    }

.nav-inner {
    height: 100%;
    max-width: 1180px;
    margin-inline: auto;
    padding-inline: 24px;
    display: flex;
    align-items: center;
    gap: 28px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; flex: none; }
.brand-mark { display: inline-flex; border-radius: 8px; filter: drop-shadow(0 6px 14px rgba(47, 91, 255, .35)); }
.brand-name { font-size: 18px; font-weight: 800; letter-spacing: -.01em; }

.nav-links button {
    border: 0;
    background: transparent;
    font-family: inherit;
    cursor: pointer;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 6px;
}
    .nav-links a,
    .nav-links button {
        position: relative;
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 7px 12px;
        border-radius: 9px;
        font-size: 14px;
        font-weight: 550;
        color: var(--text-2);
        transition: color .18s var(--ease), background .18s var(--ease);
    }
        .nav-links a:hover,
        .nav-links button:hover { color: var(--text); background: var(--panel-2); }
        .nav-links a.active,
        .nav-links button.active { color: var(--text); }
            .nav-links a.active::after,
            .nav-links button.active::after {
                content: '';
                position: absolute;
                left: 12px;
                right: 12px;
                bottom: 1px;
                height: 2px;
                border-radius: 2px;
                background: var(--grad);
            }

/* 图标按钮的悬停提示：原生 title 又慢又丑，这里自己画一个 */
[data-tip] { position: relative; }
    [data-tip]::after {
        content: attr(data-tip);
        position: absolute;
        top: calc(100% + 10px);
        left: 50%;
        transform: translate(-50%, -5px);
        padding: 6px 10px;
        border: 1px solid var(--line-2);
        border-radius: 8px;
        background: var(--panel);
        color: var(--text);
        font-size: 12px;
        font-weight: 500;
        line-height: 1.4;
        white-space: nowrap;
        box-shadow: var(--shadow-md);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity .16s var(--ease), transform .16s var(--ease), visibility .16s;
        z-index: 40;
    }
    [data-tip]:hover::after,
    [data-tip]:focus-visible::after {
        opacity: 1;
        visibility: visible;
        transform: translate(-50%, 0);
    }

.nav-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-2);
    cursor: pointer;
    transition: color .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease);
}
    .icon-btn:hover { color: var(--text); background: var(--panel-2); border-color: var(--line); }

/* 主题按钮的双图标：深色下显示太阳（点了变浅），浅色下显示月亮 */
[data-theme='dark'] .ico-theme-light,
[data-theme='light'] .ico-theme-dark { display: none; }
[data-theme='light'] .ico-theme-light { display: block; }

.nav-burger { display: none; }

/* ---------- 5. 首页 ---------- */
.hero {
    position: relative;
    overflow: hidden;
    padding: clamp(56px, 8vw, 96px) 0 clamp(48px, 7vw, 84px);
    isolation: isolate;
}

.hero-bg {
    position: absolute;
    inset: -20% -10% auto -10%;
    height: 120%;
    z-index: -1;
    pointer-events: none;
}
    .hero-bg .aurora {
        position: absolute;
        border-radius: 50%;
        filter: blur(70px);
        opacity: .55;
        animation: aurora 18s ease-in-out infinite;
    }
    .hero-bg .a1 { width: 46vw; height: 46vw; left: -6%; top: -18%; background: radial-gradient(circle, rgba(47, 91, 255, .5), transparent 65%); }
    .hero-bg .a2 { width: 38vw; height: 38vw; right: -4%; top: -8%; background: radial-gradient(circle, rgba(91, 124, 255, .38), transparent 65%); animation-delay: -6s; }
    .hero-bg .a3 { width: 30vw; height: 30vw; left: 34%; top: 24%; background: radial-gradient(circle, rgba(124, 92, 255, .22), transparent 68%); animation-delay: -11s; }
    .hero-bg::after {
        content: '';
        position: absolute;
        inset: 0;
        background-image: linear-gradient(to right, var(--line) 1px, transparent 1px),
                          linear-gradient(to bottom, var(--line) 1px, transparent 1px);
        background-size: 64px 64px;
        mask-image: radial-gradient(ellipse 70% 60% at 50% 20%, #000 20%, transparent 78%);
        opacity: .5;
    }

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: center;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    height: 30px;
    padding: 0 12px 0 6px;
    border-radius: 99px;
    border: 1px solid var(--line-2);
    background: color-mix(in srgb, var(--panel) 70%, transparent);
    font-size: 12.5px;
    color: var(--text-2);
    backdrop-filter: blur(6px);
}
    .hero-eyebrow b { color: var(--text); font-weight: 700; }

.hero h1 {
    font-size: clamp(34px, 5.2vw, 62px);
    letter-spacing: -.035em;
    margin: 20px 0 0;
}
    .hero h1 .line { display: block; }

.hero .lede {
    margin-top: 20px;
    max-width: 34em;
    font-size: clamp(15px, 1.35vw, 17.5px);
    color: var(--text-2);
}
    .hero .lede b { color: var(--text); font-weight: 650; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.hero-note {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    margin-top: 22px;
    font-size: 13px;
    color: var(--text-3);
}
    .hero-note span { display: inline-flex; align-items: center; gap: 6px; }
    .hero-note .ico { color: var(--ok); }

/* 右侧代码窗 */
/* 网格子项默认 min-width:auto，里面 pre 的长行会把整列撑爆、被 hero 的 overflow 切掉；
   给 0 才能让 pre 自己横向滚动。 */
.hero-visual { position: relative; min-width: 0; }

.code-window {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: color-mix(in srgb, var(--panel) 92%, transparent);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    min-width: 0;
    backdrop-filter: blur(10px);
}
    .code-window::before {
        content: '';
        position: absolute;
        inset: -1px;
        border-radius: inherit;
        padding: 1px;
        background: linear-gradient(140deg, var(--brand-line), transparent 45%, transparent 60%, rgba(124, 92, 255, .34));
        -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
        -webkit-mask-composite: xor;
        mask-composite: exclude;
        pointer-events: none;
    }

.code-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-bottom: 1px solid var(--line);
    background: var(--panel-2);
}
    .code-dots { display: flex; gap: 6px; }
    .code-dots i { width: 10px; height: 10px; border-radius: 99px; background: var(--line-2); }
    .code-dots i:nth-child(1) { background: #FF5F57; }
    .code-dots i:nth-child(2) { background: #FEBC2E; }
    .code-dots i:nth-child(3) { background: #28C840; }

.code-tabs { display: flex; gap: 2px; margin-left: auto; }
    .code-tabs button {
        height: 26px;
        padding: 0 10px;
        border-radius: 7px;
        border: 1px solid transparent;
        background: transparent;
        color: var(--text-3);
        font-size: 12.5px;
        font-weight: 600;
        cursor: pointer;
        transition: color .16s var(--ease), background .16s var(--ease), border-color .16s var(--ease);
    }
        .code-tabs button:hover { color: var(--text-2); }
        .code-tabs button.active {
            color: var(--text);
            background: var(--panel);
            border-color: var(--line-2);
        }

/* 三个页签的内容行数不一样，卡片高度必须钉死，否则一切页签整块就往下蹿 */
.code-body { position: relative; height: 322px; }
.code-panel { height: 100%; }
.code-panel { display: none; }
    .code-panel.active { display: block; }

.code-panel pre {
    margin: 0;
    padding: 18px 18px 20px;
    overflow: auto;
    height: 100%;
    font-family: 'JetBrains Mono', 'Cascadia Code', Consolas, ui-monospace, monospace;
    font-size: 12.2px;
    line-height: 1.78;
    tab-size: 2;
}
    .code-panel pre::-webkit-scrollbar { width: 8px; height: 8px; }

.copy-btn {
    position: absolute;
    right: 12px;
    bottom: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 30px;
    padding: 0 10px;
    border-radius: 8px;
    border: 1px solid var(--line-2);
    background: var(--panel);
    color: var(--text-2);
    font-size: 12px;
    cursor: pointer;
    opacity: 0;
    transition: opacity .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
    .code-body:hover .copy-btn { opacity: 1; }
    .copy-btn:hover { color: var(--text); border-color: var(--brand-line); }
    .copy-btn.done { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }

/* 语法着色 */
.tok-k { color: #C792EA; }
.tok-s { color: #A5E075; }
.tok-n { color: #F78C6C; }
.tok-c { color: var(--text-3); font-style: italic; }
.tok-f { color: #82AAFF; }
.tok-t { color: #FFCB6B; }

[data-theme='light'] .tok-k { color: #8B34C9; }
[data-theme='light'] .tok-s { color: #2F8A3B; }
[data-theme='light'] .tok-n { color: #C2571A; }
[data-theme='light'] .tok-f { color: #2563EB; }
[data-theme='light'] .tok-t { color: #A15C00; }

/* 数据条 */
.stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    margin-top: clamp(40px, 6vw, 64px);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--line);
    overflow: hidden;
}
.stat {
    padding: 22px 24px;
    background: var(--bg);
}
    .stat b {
        display: block;
        font-size: clamp(22px, 2.6vw, 30px);
        font-weight: 800;
        letter-spacing: -.02em;
        background: var(--grad);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
    }
    .stat span { font-size: 13px; color: var(--text-3); }

/* 能力矩阵 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.card {
    position: relative;
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    transition: transform .28s var(--ease), border-color .28s var(--ease), background .28s var(--ease), box-shadow .28s var(--ease);
    overflow: hidden;
}
    .card::after {
        content: '';
        position: absolute;
        inset: 0;
        background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), var(--brand-soft), transparent 60%);
        opacity: 0;
        transition: opacity .3s var(--ease);
        pointer-events: none;
    }
    .card:hover {
        transform: translateY(-3px);
        border-color: var(--brand-line);
        box-shadow: var(--shadow-md);
    }
        .card:hover::after { opacity: 1; }

.feature-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: var(--grad-soft);
    border: 1px solid var(--line);
    color: var(--brand-2);
    margin-bottom: 16px;
}
    .feature-ico .ico { width: 20px; height: 20px; }

.card h3 { font-size: 16.5px; margin-bottom: 8px; }
.card p { font-size: 13.8px; color: var(--text-2); line-height: 1.7; }

.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
    .card-tags .chip { height: 21px; font-size: 11.5px; }

/* 后端能力：左四点、右代码窗 */
.backend-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    gap: clamp(20px, 3vw, 36px);
    align-items: start;
}
.be-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.be-item {
    display: flex;
    gap: 14px;
    padding: 15px 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--panel);
    transition: border-color .2s var(--ease), background .2s var(--ease);
}
    .be-item:hover { border-color: var(--brand-line); background: var(--panel-2); }
.be-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    flex: none;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--grad-soft);
    color: var(--brand);
}
    .be-ico .ico { width: 17px; height: 17px; }
.be-item h3 { font-size: 14.5px; margin-bottom: 4px; }
.be-item p { font-size: 13px; color: var(--text-2); line-height: 1.65; }

/* 宿主 */
.hosts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.host {
    display: flex;
    gap: 14px;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: linear-gradient(180deg, var(--panel-2), transparent 70%);
}
    .host-ico {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 38px;
        height: 38px;
        border-radius: 11px;
        border: 1px solid var(--line-2);
        background: var(--bg);
        color: var(--brand-2);
        flex: none;
    }
    .host h3 { font-size: 15px; margin-bottom: 4px; }
    .host p { font-size: 13px; color: var(--text-3); }

/* 上手步骤 */
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; counter-reset: step; }
.step {
    position: relative;
    padding: 24px 22px 22px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
}
    .step::before {
        counter-increment: step;
        content: '0' counter(step);
        position: absolute;
        top: 18px;
        right: 20px;
        font-size: 30px;
        font-weight: 800;
        letter-spacing: -.03em;
        color: var(--text);
        opacity: .07;
    }
    .step h3 { font-size: 15.5px; margin-bottom: 8px; }
    .step p { font-size: 13.4px; color: var(--text-2); margin-bottom: 14px; }

.step code,
.inline-code {
    display: inline-block;
    padding: 4px 9px;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: var(--bg-2);
    font-family: 'JetBrains Mono', 'Cascadia Code', Consolas, ui-monospace, monospace;
    font-size: 12.2px;
    color: var(--brand-2);
}

/* 收尾 CTA */
.cta-band {
    position: relative;
    margin: clamp(56px, 8vw, 96px) 0 0;
    padding: clamp(36px, 5vw, 60px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--brand-line);
    background:
        radial-gradient(600px circle at 15% 0%, rgba(47, 91, 255, .2), transparent 60%),
        radial-gradient(500px circle at 85% 100%, rgba(124, 92, 255, .14), transparent 60%),
        var(--panel);
    overflow: hidden;
    text-align: center;
}
    .cta-band h2 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 12px; }
    .cta-band p { color: var(--text-2); max-width: 40em; margin: 0 auto 26px; }
    .cta-band .hero-cta { justify-content: center; margin-top: 0; }

/* ---------- 6. 更新日志 ---------- */
.page-hero {
    position: relative;
    padding: clamp(44px, 6vw, 72px) 0 clamp(24px, 3vw, 34px);
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, var(--bg-2), transparent);
    overflow: hidden;
}
    .page-hero::before {
        content: '';
        position: absolute;
        inset: -60% 40% auto -10%;
        height: 160%;
        background: radial-gradient(circle at 30% 40%, rgba(47, 91, 255, .16), transparent 60%);
        pointer-events: none;
    }
    .page-hero h1 { font-size: clamp(28px, 4vw, 44px); margin: 14px 0 12px; }
    .page-hero p { color: var(--text-2); max-width: 46em; }

.page-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 18px;
    margin-top: 22px;
    font-size: 13px;
    color: var(--text-3);
}
    .page-meta .sep { width: 4px; height: 4px; border-radius: 99px; background: var(--line-2); }
    .page-meta b { color: var(--text); font-weight: 650; }

/* ---------- 7. 路线图 ---------- */
.kanban {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
}
.kanban-col {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: color-mix(in srgb, var(--panel) 60%, transparent);
    padding: 16px;
}
    .kanban-col[data-key='shipped'] { border-top: 2px solid var(--ok); }
    .kanban-col[data-key='doing'] { border-top: 2px solid var(--brand); }
    .kanban-col[data-key='planned'] { border-top: 2px solid var(--brand-3); }

.kanban-head { padding: 4px 4px 14px; }
    .kanban-head h2 {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 15px;
        letter-spacing: 0;
    }
    .kanban-head .count {
        margin-left: auto;
        font-size: 12px;
        font-weight: 700;
        color: var(--text-3);
        background: var(--panel-2);
        border: 1px solid var(--line);
        border-radius: 99px;
        padding: 1px 8px;
    }
    .kanban-head p { font-size: 12.5px; color: var(--text-3); margin-top: 4px; }

.dot-key { width: 7px; height: 7px; border-radius: 99px; flex: none; }
    [data-key='shipped'] .dot-key { background: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
    [data-key='doing'] .dot-key { background: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
    [data-key='planned'] .dot-key { background: var(--brand-3); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand-3) 15%, transparent); }

.kanban-items { display: grid; gap: 10px; }

.rm-card {
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: var(--panel);
    transition: transform .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}
    .rm-card:hover { transform: translateY(-2px); border-color: var(--brand-line); box-shadow: var(--shadow-md); }

.rm-top { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
    .rm-eta { margin-left: auto; font-size: 11.5px; color: var(--text-3); display: inline-flex; align-items: center; gap: 5px; }
    .rm-card h3 { font-size: 14.5px; margin-bottom: 6px; }
    .rm-card p { font-size: 13px; color: var(--text-2); line-height: 1.65; }

.rm-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 12px; }
    .rm-tags .chip { height: 20px; font-size: 11px; padding: 0 7px; }

.progress { margin-top: 12px; }
    .progress-bar {
        height: 5px;
        border-radius: 99px;
        background: var(--line);
        overflow: hidden;
    }
    .progress-bar i {
        display: block;
        height: 100%;
        border-radius: inherit;
        background: var(--grad);
        width: 0;
        transition: width 1s var(--ease);
    }
    [data-key='shipped'] .progress-bar i { background: linear-gradient(90deg, #16A34A, #22C55E); }
    [data-key='planned'] .progress-bar i { background: var(--line-2); }
    .progress-meta {
        display: flex;
        justify-content: space-between;
        margin-top: 6px;
        font-size: 11.5px;
        color: var(--text-3);
        font-variant-numeric: tabular-nums;
    }
    .rm-card.done .progress { display: none; }

/* ---------- 4b. 页脚 ---------- */
.foot {
    margin-top: clamp(56px, 8vw, 96px);
    border-top: 1px solid var(--line);
    background: var(--bg-2);
    padding-top: 48px;
}
.foot-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: 32px;
    padding-bottom: 36px;
}
.foot-brand p { margin-top: 14px; font-size: 13.2px; color: var(--text-3); line-height: 1.8; }
.foot-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.foot-col { display: flex; flex-direction: column; gap: 10px; }
.foot-col button {
        border: 0;
        background: transparent;
        font-family: inherit;
        padding: 0;
        text-align: left;
        cursor: pointer;
        color: var(--text-2);
        transition: color .16s var(--ease);
    }

    .foot-col h4 {
        font-size: 12.5px;
        letter-spacing: .1em;
        text-transform: uppercase;
        color: var(--text-3);
        margin-bottom: 4px;
        font-weight: 700;
    }
    .foot-col a,
    .foot-col button {
        font-size: 13.5px;
        color: var(--text-2);
        width: fit-content;
        transition: color .16s var(--ease);
    }
        .foot-col a:hover,
        .foot-col button:hover { color: var(--brand); }

.foot-bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 18px 24px 26px;
    border-top: 1px solid var(--line);
    font-size: 12.5px;
    color: var(--text-3);
}
    .foot-meta { display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; }
    .foot-meta b { color: var(--text-2); font-weight: 650; }
    .dot-sep { width: 4px; height: 4px; border-radius: 99px; background: var(--line-2); }

/* 空态 */
.empty {
    padding: 60px 20px;
    text-align: center;
    color: var(--text-3);
    border: 1px dashed var(--line-2);
    border-radius: var(--radius);
}

/* 404 / 错误 */
.notfound {
    min-height: 62vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 14px;
    padding: 60px 20px;
}
    .notfound .code { font-size: clamp(64px, 12vw, 132px); font-weight: 800; letter-spacing: -.05em; line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
    .notfound p { color: var(--text-2); }

/* ---------- 9. 右下角浮动条（回到顶部 / 公众号 / QQ 群） ---------- */
.fab {
    position: fixed;
    right: 24px;
    bottom: 28px;
    z-index: 45;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.fab-item { position: relative; }

.fab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    border: 1px solid var(--line-2);
    background: color-mix(in srgb, var(--panel) 90%, transparent);
    color: var(--text-2);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease), transform .18s var(--ease);
}
    .fab-btn .ico { width: 19px; height: 19px; }
    .fab-btn:hover,
    .fab-item:hover .fab-btn {
        color: var(--brand);
        border-color: var(--brand-line);
        background: var(--panel);
        transform: translateY(-2px);
    }

/* 悬停弹出的二维码卡片：贴在按钮左侧 */
.fab-pop {
    position: absolute;
    right: calc(100% + 12px);
    bottom: -4px;
    width: 172px;
    padding: 10px;
    border: 1px solid var(--line-2);
    border-radius: 14px;
    background: var(--panel);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateX(8px);
    transition: opacity .18s var(--ease), transform .18s var(--ease), visibility .18s;
    pointer-events: none;
}
    /* 指向按钮的小三角 */
    .fab-pop::after {
        content: '';
        position: absolute;
        right: -5px;
        bottom: 15px;
        width: 8px;
        height: 8px;
        background: var(--panel);
        border-top: 1px solid var(--line-2);
        border-right: 1px solid var(--line-2);
        transform: rotate(45deg);
    }
    .fab-item:hover .fab-pop,
    .fab-item:focus-within .fab-pop,
    .fab-item.is-open .fab-pop {
        opacity: 1;
        visibility: visible;
        transform: none;
    }
    .fab-pop img {
        display: block;
        width: 100%;
        height: auto;
        border-radius: 9px;
        background: #fff;
    }
    .fab-pop em {
        display: block;
        margin-top: 8px;
        font-size: 12px;
        font-style: normal;
        color: var(--text-2);
        text-align: center;
    }

/* 回到顶部：滚动一段才出现 */
.fab-top {
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
}
.fab.show-top .fab-top {
    opacity: 1;
    visibility: visible;
    transform: none;
}

/* 浮动条里的提示改成往左弹，免得贴着屏幕底边 */
.fab-btn[data-tip]::after {
    top: 50%;
    left: auto;
    right: calc(100% + 10px);
    transform: translate(6px, -50%);
}
.fab-btn[data-tip]:hover::after {
    transform: translate(0, -50%);
}

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1080px) {
    .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .foot-grid { grid-template-columns: 1.4fr 1fr 1fr; }
    .foot-col:last-child { display: none; }
}

@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero-visual { order: 2; }
    .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .hosts, .steps, .kanban, .backend-grid { grid-template-columns: 1fr; }
    .section-head.row { flex-direction: column; align-items: flex-start; gap: 12px; }

    .nav-burger { display: inline-flex; }
    .nav-cta { display: none; }
    .nav-links {
        position: fixed;
        inset: var(--nav-h) 0 auto 0;
        flex-direction: column;
        align-items: stretch;
        gap: 2px;
        padding: 12px 18px 18px;
        background: var(--bg);
        border-bottom: 1px solid var(--line);
        box-shadow: var(--shadow-md);
        transform: translateY(-12px);
        opacity: 0;
        visibility: hidden;
        transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
    }
        .nav-links.open { opacity: 1; visibility: visible; transform: none; }
        .nav-links a,
        .nav-links button { padding: 12px 10px; font-size: 15px; text-align: left; }
            .nav-links a.active::after,
            .nav-links button.active::after { display: none; }
}

@media (max-width: 640px) {
    .wrap { padding-inline: 18px; }
    .nav-inner { padding-inline: 18px; gap: 12px; }
    .feature-grid { grid-template-columns: 1fr; }
    .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .foot-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
    .foot-brand { grid-column: 1 / -1; }
    .foot-bottom { flex-direction: column; align-items: flex-start; }
    .hero-note { gap: 6px 14px; }
    .code-body { height: 300px; }
    .code-panel pre { font-size: 11.6px; }
    .fab { right: 14px; bottom: 16px; gap: 8px; }
    .fab-btn { width: 40px; height: 40px; border-radius: 12px; }
    .fab-pop { width: 150px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: .001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .001ms !important;
    }
    .reveal { opacity: 1; transform: none; }
}