/* ==========================================================================
   QInEX 官网 · 弹簧内核视觉体系
   主题:整站是一块被 QInEX 驱动的触摸屏。
   所有运动来自同一个弹簧物理内核(main.js),CSS 侧的过渡也统一用
   真实弹簧解算出来的 linear() 曲线,保证非线性手感一致。
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */

:root {
    /* 色板:OLED 近黑 + 品牌信号绿 + 速度红(HUD)+ 焊锡琥珀(仅 P4 硬件段) */
    --ink: #060908;
    --panel: rgba(14, 20, 17, 0.72);
    --panel-solid: #0d1411;
    --line: rgba(190, 235, 210, 0.13);
    --line-strong: rgba(190, 235, 210, 0.3);
    --paper: var(--text-color, #eef5f0);
    --mist: #9db0a6;
    --dim: #5f7168;
    --signal: var(--accent-color, #00ff88);
    --velocity: #ff5470;
    --solder: #f2bd5e;

    --font-cjk: "Segoe UI Variable Display", "Segoe UI", "Microsoft YaHei UI", "PingFang SC", sans-serif;
    --font-mono: "Cascadia Code", "Cascadia Mono", Consolas, "SFMono-Regular", Menlo, monospace;

    --radius: 10px;
    --max: 1180px;
    --hud-gap: 30px;             /* 边缘标尺占位 */

    /* 弹簧缓动(下方 @supports 替换为真弹簧曲线) */
    --spr-pop: cubic-bezier(0.34, 1.56, 0.64, 1);
    --spr-soft: cubic-bezier(0.22, 1, 0.36, 1);
    --spr-settle: cubic-bezier(0.33, 0, 0.16, 1);

    /* 由 JS 弹簧内核逐帧写入 */
    --energy: 0;                 /* 全局能量:指针+滚动速度,调制辉光 */
    --sp: 0;                     /* 滚动进度(弹簧追随后) */
    --rf: 0;                     /* 信号走线填充比例 */
    --route-h: 100vh;

    color-scheme: dark;
}

/* 真弹簧曲线:由 spring 微分方程采样生成(ζ=0.55 / 0.78 / 1.0) */
@supports (transition-timing-function: linear(0, 1)) {
    :root {
        --spr-pop: linear(0 0%, 0.0748 3.8%, 0.2506 7.7%, 0.4655 11.5%, 0.6752 15.4%, 0.8526 19.2%, 0.9848 23.1%, 1.0703 26.9%, 1.1144 30.8%, 1.1263 34.6%, 1.1163 38.5%, 1.0938 42.3%, 1.0666 46.2%, 1.0402 50%, 1.0179 53.8%, 1.0014 57.7%, 0.9908 61.5%, 0.9854 65.4%, 0.984 69.2%, 0.9854 73.1%, 0.9883 76.9%, 0.9917 80.8%, 0.995 84.6%, 0.9978 88.5%, 0.9999 92.3%, 1.0012 96.2%, 1.0019 100%);
        --spr-soft: linear(0 0%, 0.0434 3.8%, 0.1464 7.7%, 0.2773 11.5%, 0.4146 15.4%, 0.5448 19.2%, 0.6603 23.1%, 0.7576 26.9%, 0.836 30.8%, 0.8967 34.6%, 0.9418 38.5%, 0.9738 42.3%, 0.9953 46.2%, 1.0088 50%, 1.0162 53.8%, 1.0194 57.7%, 1.0198 61.5%, 1.0185 65.4%, 1.0162 69.2%, 1.0135 73.1%, 1.0108 76.9%, 1.0083 80.8%, 1.0061 84.6%, 1.0043 88.5%, 1.0028 92.3%, 1.0017 96.2%, 1.0009 100%);
        --spr-settle: linear(0 0%, 0.0303 3.8%, 0.1021 7.7%, 0.194 11.5%, 0.2925 15.4%, 0.3894 19.2%, 0.48 23.1%, 0.5619 26.9%, 0.634 30.8%, 0.6965 34.6%, 0.7499 38.5%, 0.795 42.3%, 0.8328 46.2%, 0.8641 50%, 0.89 53.8%, 0.9112 57.7%, 0.9285 61.5%, 0.9426 65.4%, 0.9541 69.2%, 0.9633 73.1%, 0.9707 76.9%, 0.9767 80.8%, 0.9815 84.6%, 0.9853 88.5%, 0.9883 92.3%, 0.9908 96.2%, 0.9927 100%);
    }
}

/* ---------- 2. 基础 ---------- */

* {
    box-sizing: border-box;
}

html {
    /* 锚点滚动由 JS 弹簧驱动,禁用原生平滑避免叠加 */
    scroll-behavior: auto;
}

body {
    margin: 0;
    min-height: 100vh;
    position: relative;
    color: var(--paper);
    font-family: var(--font-cjk);
    background:
        linear-gradient(90deg, color-mix(in srgb, var(--signal) 4%, transparent) 1px, transparent 1px),
        linear-gradient(0deg, color-mix(in srgb, var(--signal) 3%, transparent) 1px, transparent 1px),
        radial-gradient(circle at 82% -4%, color-mix(in srgb, var(--signal) 10%, transparent), transparent 30rem),
        radial-gradient(circle at -6% 38%, color-mix(in srgb, var(--solder) 6%, transparent), transparent 26rem),
        var(--ink);
    background-size: 56px 56px, 56px 56px, auto, auto, auto;
    overflow-x: hidden;
}

html.js body.is-booting {
    overflow: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
    background: linear-gradient(180deg, rgba(6, 9, 8, 0.12), var(--ink) 92%);
}

a {
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

code {
    font-family: var(--font-mono);
    font-size: 0.92em;
    padding: 1px 6px;
    border: 1px solid var(--line);
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--signal);
}

::selection {
    background: color-mix(in srgb, var(--signal) 30%, transparent);
    color: var(--paper);
}

:focus-visible {
    outline: 2px solid var(--signal);
    outline-offset: 3px;
    border-radius: 4px;
}

/* 原生滚动条隐藏:右缘 HUD 进度条(可点可拖)承担滚动指示与定位 */
html {
    scrollbar-width: none;
}

::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
}

/* ---------- 3. 校准加载器 ---------- */

.boot {
    display: none;
}

html.js .boot {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 120;
    background:
        linear-gradient(90deg, color-mix(in srgb, var(--signal) 5%, transparent) 1px, transparent 1px),
        linear-gradient(0deg, color-mix(in srgb, var(--signal) 4%, transparent) 1px, transparent 1px),
        var(--ink);
    background-size: 56px 56px, 56px 56px, auto;
    opacity: 1;
    transition: opacity 640ms var(--spr-settle) 120ms, visibility 800ms linear;
}

html.js .boot.done {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* 校准十字线:跟着触点走;结束时 JS 把它们弹到页面边缘,与 HUD 标尺完成交接 */
.boot-cross {
    position: absolute;
    background: color-mix(in srgb, var(--signal) 34%, transparent);
    will-change: transform;
}

.boot-cross-h {
    left: 0;
    top: 0;
    width: 100%;
    height: 1px;
}

.boot-cross-v {
    left: 0;
    top: 0;
    width: 1px;
    height: 100%;
}

/* 标定点:四角 + 中心 */
.boot-pt {
    position: absolute;
    left: var(--px);
    top: var(--py);
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 1px solid rgba(190, 235, 210, 0.3);
    transform: rotate(45deg) scale(1);
    transition: border-color 300ms var(--spr-soft), transform 500ms var(--spr-pop), box-shadow 300ms var(--spr-soft);
}

.boot-pt::after {
    content: "";
    position: absolute;
    inset: 5px;
    background: rgba(190, 235, 210, 0.24);
    transition: background 300ms var(--spr-soft);
}

.boot-pt.hit {
    border-color: var(--signal);
    transform: rotate(45deg) scale(1.28);
    box-shadow: 0 0 22px color-mix(in srgb, var(--signal) 45%, transparent);
}

.boot-pt.hit::after {
    background: var(--signal);
}

/* 校准触点:JS 弹簧驱动;加载完成后它就是全站跟随器的前身 */
.boot-dot {
    position: absolute;
    left: 0;
    top: 0;
    width: 30px;
    height: 30px;
    margin: -15px 0 0 -15px;
    will-change: transform;
    opacity: 0; /* JS 首帧定位后再显示,避免闪在左上角 */
}

.boot-dot::before {
    content: "";
    position: absolute;
    inset: 0;
    border: 1.5px solid var(--signal);
    border-radius: 50%;
    box-shadow: 0 0 26px color-mix(in srgb, var(--signal) 55%, transparent);
}

.boot-dot span {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 5px;
    height: 5px;
    margin: -2.5px 0 0 -2.5px;
    border-radius: 50%;
    background: var(--signal);
}

.boot-hud {
    position: absolute;
    left: 50%;
    bottom: 13vh;
    transform: translateX(-50%);
    width: min(430px, 86vw);
    font-family: var(--font-mono);
    transition: opacity 320ms var(--spr-settle), transform 420ms var(--spr-settle);
}

.boot.done .boot-hud {
    opacity: 0;
    transform: translateX(-50%) translateY(14px);
}

.boot-brand {
    display: flex;
    align-items: center;
    gap: 9px;
    margin: 0 0 18px;
    font-size: 12px;
    letter-spacing: 0.22em;
    color: var(--mist);
}

.boot-brand img {
    width: 16px;
    height: 16px;
}

.boot-sync {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin: 0 0 10px;
}

.boot-sync span {
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--dim);
}

.boot-sync strong {
    font-size: 34px;
    font-weight: 600;
    color: var(--signal);
    font-variant-numeric: tabular-nums;
    text-shadow: 0 0 30px color-mix(in srgb, var(--signal) 45%, transparent);
}

.boot-bar {
    height: 2px;
    background: rgba(190, 235, 210, 0.12);
    overflow: hidden;
}

.boot-bar span {
    display: block;
    height: 100%;
    width: 100%;
    background: var(--signal);
    box-shadow: 0 0 16px var(--signal);
    transform: scaleX(var(--bp, 0));
    transform-origin: left center;
}

.boot-log {
    margin: 16px 0 0;
    padding: 0;
    list-style: none;
    min-height: 64px;
    font-size: 11px;
    color: var(--dim);
    display: grid;
    gap: 4px;
}

.boot-log li {
    opacity: 0;
    transform: translateY(6px);
    animation: bootLogIn 480ms var(--spr-soft) forwards;
    font-variant-numeric: tabular-nums;
}

.boot-log li::before {
    content: "> ";
    color: var(--signal);
}

@keyframes bootLogIn {
    to {
        opacity: 1;
        transform: none;
    }
}

/* ---------- 4. HUD 坐标框架 ---------- */

.hud {
    pointer-events: none;
}

.hud-ruler {
    position: fixed;
    z-index: 60;
    opacity: 0;
    transition: opacity 700ms var(--spr-settle) 250ms, transform 800ms var(--spr-soft) 250ms;
}

/* 顶部标尺:刻度 + 跟随光标 X 的游标 */
.hud-ruler-x {
    top: 0;
    left: 0;
    right: 0;
    height: var(--hud-gap);
    transform: translateY(-10px);
    background:
        repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 10px) left bottom / 100% 5px no-repeat,
        repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 100px) left bottom / 100% 9px no-repeat;
}

/* 左侧标尺:跟随光标 Y */
.hud-ruler-y {
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--hud-gap);
    transform: translateX(-10px);
    background:
        repeating-linear-gradient(0deg, var(--line) 0 1px, transparent 1px 10px) right top / 5px 100% no-repeat,
        repeating-linear-gradient(0deg, var(--line-strong) 0 1px, transparent 1px 100px) right top / 9px 100% no-repeat;
}

body.boot-done .hud-ruler {
    opacity: 1;
    transform: none;
}

.hud-tick {
    position: absolute;
    will-change: transform;
}

.hud-ruler-x .hud-tick {
    left: 0;
    bottom: 0;
    width: 1px;
    height: 14px;
    background: var(--signal);
    box-shadow: 0 0 8px var(--signal);
}

.hud-ruler-y .hud-tick {
    top: 0;
    right: 0;
    height: 1px;
    width: 14px;
    background: var(--signal);
    box-shadow: 0 0 8px var(--signal);
}

.hud-tick i {
    position: absolute;
    font-family: var(--font-mono);
    font-style: normal;
    font-size: 9px;
    letter-spacing: 0.08em;
    color: var(--dim);
    font-variant-numeric: tabular-nums;
}

.hud-ruler-x .hud-tick i {
    left: 6px;
    bottom: 2px;
}

.hud-ruler-y .hud-tick i {
    right: 4px;
    top: 4px;
    writing-mode: vertical-rl;
}

/* 右侧滚动进度:承接加载条(同色同辉光),可点击/拖拽定位 */
.hud-scroll {
    position: fixed;
    top: 96px;
    right: 12px;
    bottom: 96px;
    width: 3px;
    z-index: 60;
    background: rgba(190, 235, 210, 0.1);
    opacity: 0;
    pointer-events: auto;
    cursor: pointer;
    transition: opacity 700ms var(--spr-settle) 420ms, width 250ms var(--spr-pop), background 250ms var(--spr-settle);
}

/* 加宽命中区,3px 的条不用瞄 */
.hud-scroll::before {
    content: "";
    position: absolute;
    inset: -10px -12px;
}

.hud-scroll:hover,
.hud-scroll.dragging {
    width: 6px;
    background: rgba(190, 235, 210, 0.18);
}

body.boot-done .hud-scroll {
    opacity: 1;
}

.hud-scroll span {
    display: block;
    width: 100%;
    height: 100%;
    background: var(--signal);
    box-shadow: 0 0 14px var(--signal);
    transform: scaleY(var(--sp));
    transform-origin: top center;
    will-change: transform;
    pointer-events: none;
}

/* 角落状态读数 */
.hud-readout {
    position: fixed;
    right: 26px;
    bottom: 18px;
    z-index: 60;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--dim);
    font-variant-numeric: tabular-nums;
    opacity: 0;
    transition: opacity 700ms var(--spr-settle) 550ms, color 300ms var(--spr-settle);
    contain: content;
}

body.boot-done .hud-readout {
    opacity: 1;
}

.hud-readout.v-hot {
    color: var(--velocity);
}

/* ---------- 5. 映射触点跟随器 ---------- */

.tf {
    position: fixed;
    inset: 0;
    z-index: 90;
    pointer-events: none;
    opacity: 0;
    transition: opacity 400ms var(--spr-settle);
}

body.tf-active .tf {
    opacity: 1;
}

.tf-ring {
    position: fixed;
    left: 0;
    top: 0;
    border: 1.5px solid var(--signal);
    border-radius: var(--tf-r, 999px);
    box-shadow:
        0 0 calc(10px + var(--energy) * 26px) color-mix(in srgb, var(--signal) calc(28% + var(--energy) * 40%), transparent),
        inset 0 0 12px color-mix(in srgb, var(--signal) 10%, transparent);
    will-change: transform, width, height;
    transition: border-radius 350ms var(--spr-pop), border-color 250ms var(--spr-settle);
}

.tf.is-docked .tf-ring {
    border-color: color-mix(in srgb, var(--signal) 80%, white);
}

.tf-dot {
    position: fixed;
    left: 0;
    top: 0;
    width: 5px;
    height: 5px;
    margin: -2.5px 0 0 -2.5px;
    border-radius: 50%;
    background: var(--signal);
    box-shadow: 0 0 10px var(--signal);
    will-change: transform;
}

.tf-label {
    position: fixed;
    left: 0;
    top: 0;
    padding-left: 18px;
    padding-top: 14px;
    font-family: var(--font-mono);
    font-size: 9.5px;
    letter-spacing: 0.1em;
    color: color-mix(in srgb, var(--signal) 72%, var(--mist));
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    will-change: transform;
    text-shadow: 0 0 8px rgba(0, 0, 0, 0.8);
}

/* 触点按下涟漪(点击 = touch down) */
.tf-ripple {
    position: fixed;
    left: 0;
    top: 0;
    width: 8px;
    height: 8px;
    margin: -4px 0 0 -4px;
    border: 1.5px solid var(--signal);
    border-radius: 50%;
    opacity: 0.9;
    animation: tfRipple 620ms var(--spr-settle) forwards;
}

@keyframes tfRipple {
    to {
        transform: scale(9);
        opacity: 0;
    }
}

/* ---------- 6. 信号走线 ---------- */

/* 性能注意:这层 SVG 有整页高。绝不能给全长路径挂 filter(drop-shadow 等)
   或 mix-blend-mode——滚动时逐帧重栅格化整层,低配机和软件合成直接卡死。
   辉光一律用"更宽的低透明度孪生描边"实现。 */
.route-field {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
    width: 100%;
    height: var(--route-h);
    overflow: hidden;
    pointer-events: none;
    opacity: 0;
    transition: opacity 900ms var(--spr-settle) 300ms;
}

body.boot-done .route-field {
    opacity: 1;
}

.route-svg {
    display: block;
    width: 100%;
    height: 100%;
}

.route-track,
.route-glow,
.route-fill,
.route-head {
    fill: none;
    vector-effect: non-scaling-stroke;
    stroke-linecap: round;
}

.route-track {
    stroke: rgba(190, 235, 210, 0.09);
    stroke-width: 1.6;
    stroke-dasharray: 0.004 0.006;
}

/* 填充与亮头都由弹簧值 --rf 驱动:滚动快时能量高、辉光更足 */
.route-glow {
    stroke: var(--signal);
    stroke-width: 9;
    stroke-dasharray: var(--rf) 1;
    opacity: calc(0.07 + var(--energy) * 0.16);
}

.route-fill {
    stroke: var(--signal);
    stroke-width: 2;
    stroke-dasharray: var(--rf) 1;
    opacity: calc(0.4 + var(--energy) * 0.45);
}

.route-head {
    stroke: color-mix(in srgb, var(--signal) 55%, white);
    stroke-width: 4;
    stroke-dasharray: 0.014 0.986;
    stroke-dashoffset: calc(0.014 - var(--rf));
    opacity: calc(0.65 + var(--energy) * 0.35);
}

/* 节点用零长度圆头路径画点:non-scaling-stroke 保证在 preserveAspectRatio=none 下仍是正圆 */
.route-node {
    fill: none;
    vector-effect: non-scaling-stroke;
    stroke-linecap: round;
    stroke: rgba(190, 235, 210, 0.3);
    stroke-width: 7;
    transition: stroke 450ms var(--spr-soft), stroke-width 450ms var(--spr-pop);
}

.route-node.lit {
    stroke: var(--signal);
    stroke-width: 11;
    filter: drop-shadow(0 0 12px var(--signal));
}

.route-node-end.lit {
    stroke: var(--solder);
    stroke-width: 13;
    filter: drop-shadow(0 0 16px var(--solder));
}

/* ---------- 7. 页面骨架与头部 ---------- */

.site-shell {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    padding: 0 var(--hud-gap);
}

html.js body:not(.boot-done) .site-shell {
    opacity: 0;
    transform: translateY(14px) scale(0.995);
}

body.boot-done .site-shell {
    opacity: 1;
    transform: none;
    transition: opacity 700ms var(--spr-settle), transform 900ms var(--spr-soft);
}

.site-header {
    position: fixed;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 70;
    width: min(var(--max), calc(100vw - 2 * var(--hud-gap) - 16px));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 10px 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: color-mix(in srgb, var(--ink) 74%, transparent);
    backdrop-filter: blur(14px);
    transition: box-shadow 500ms var(--spr-settle), border-color 500ms var(--spr-settle), padding 500ms var(--spr-soft);
}

html.js body:not(.boot-done) .site-header {
    opacity: 0;
    translate: 0 -18px;
}

body.boot-done .site-header {
    opacity: 1;
    translate: none;
    transition: opacity 600ms var(--spr-settle) 150ms, translate 800ms var(--spr-pop) 150ms, box-shadow 500ms var(--spr-settle), border-color 500ms var(--spr-settle), padding 500ms var(--spr-soft);
}

.site-header.is-scrolled {
    padding: 7px 18px;
    border-color: var(--line-strong);
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.5);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 0.14em;
}

.brand-mark {
    width: 22px;
    height: 22px;
    filter: drop-shadow(0 0 8px color-mix(in srgb, var(--signal) 50%, transparent));
}

.site-nav {
    position: relative;
    display: flex;
    align-items: center;
    gap: 4px;
}

.site-nav a {
    position: relative;
    z-index: 1;
    padding: 7px 13px;
    border-radius: 9px;
    text-decoration: none;
    font-size: 13.5px;
    color: var(--mist);
    transition: color 250ms var(--spr-settle);
}

.site-nav a:hover,
.site-nav a.is-active {
    color: var(--paper);
}

/* 导航活动指示块:由 JS 弹簧驱动位置/宽度 */
.nav-marker {
    position: absolute;
    left: 0;
    top: 50%;
    height: 30px;
    width: 0;
    translate: 0 -50%;
    border-radius: 9px;
    background: rgba(190, 235, 210, 0.07);
    border: 1px solid var(--line);
    opacity: 0;
    will-change: transform, width;
}

.nav-marker.on {
    opacity: 1;
}

.site-nav .nav-cta {
    margin-left: 8px;
    color: var(--ink);
    background: var(--signal);
    font-weight: 600;
    box-shadow: 0 0 0 color-mix(in srgb, var(--signal) 40%, transparent);
    transition: box-shadow 350ms var(--spr-soft), translate 350ms var(--spr-pop), color 250ms var(--spr-settle);
}

.site-nav .nav-cta:hover {
    color: var(--ink);
    box-shadow: 0 6px 26px color-mix(in srgb, var(--signal) 42%, transparent);
    translate: 0 -1px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 9px;
    border: 1px solid var(--line);
    border-radius: 9px;
    background: transparent;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 17px;
    height: 1.5px;
    background: var(--paper);
    transition: transform 400ms var(--spr-pop), opacity 250ms var(--spr-settle);
}

/* ---------- 8. 段落公共 + 弹簧显现系统 ---------- */

main {
    max-width: var(--max);
    margin: 0 auto;
}

.section-band {
    padding: 120px 0 60px;
}

.eyebrow {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.32em;
    color: var(--signal);
}

.eyebrow::before {
    content: "◈ ";
    opacity: 0.7;
}

h1,
h2,
h3 {
    margin: 0;
    font-weight: 700;
    letter-spacing: -0.015em;
}

h1 {
    font-size: clamp(38px, 5.2vw, 62px);
    line-height: 1.14;
}

h2 {
    font-size: clamp(26px, 3.4vw, 40px);
    line-height: 1.22;
}

.section-heading {
    max-width: 720px;
    margin-bottom: 56px;
}

.section-heading p:not(.eyebrow) {
    margin: 18px 0 0;
    color: var(--mist);
    font-size: 16px;
    line-height: 1.8;
}

/* 显现:进入视口时由弹簧曲线弹入,--i 控制级联次序,方向感知 */
html.js .reveal {
    opacity: 0;
    transform: translateY(30px);
}

html.js .reveal.from-up {
    transform: translateY(-30px);
}

html.js .reveal.visible {
    opacity: 1;
    transform: none;
    /* translate/border/box-shadow 一并接管:reveal 的高优先级会覆盖组件自身的 transition 列表 */
    transition:
        opacity 550ms var(--spr-settle) calc(var(--i, 0) * 75ms),
        transform 850ms var(--spr-pop) calc(var(--i, 0) * 75ms),
        translate 450ms var(--spr-pop),
        border-color 400ms var(--spr-settle),
        box-shadow 500ms var(--spr-settle);
}

/* ---------- 9. HERO 与实时映射演示 ---------- */

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: center;
    min-height: calc(100vh - 40px);
    padding-top: 130px;
}

.hero-lede {
    margin: 22px 0 0;
    max-width: 520px;
    color: var(--mist);
    font-size: 16px;
    line-height: 1.85;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 34px;
}

.button {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: var(--radius);
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.02em;
    will-change: transform;
    transition: box-shadow 400ms var(--spr-soft), background 250ms var(--spr-settle), border-color 250ms var(--spr-settle), color 250ms var(--spr-settle);
}

.button.primary {
    background: var(--signal);
    color: var(--ink);
    box-shadow: 0 0 0 color-mix(in srgb, var(--signal) 30%, transparent);
}

.button.primary:hover {
    box-shadow: 0 10px 38px color-mix(in srgb, var(--signal) 40%, transparent);
}

.button.secondary {
    border: 1px solid var(--line-strong);
    color: var(--paper);
    background: rgba(255, 255, 255, 0.02);
}

.button.secondary:hover {
    border-color: var(--signal);
    background: color-mix(in srgb, var(--signal) 7%, transparent);
}

.button.ghost {
    color: var(--mist);
    padding-left: 14px;
    padding-right: 14px;
}

.button.ghost:hover {
    color: var(--paper);
}

.hero-metrics {
    display: flex;
    gap: 44px;
    margin: 52px 0 0;
    padding-top: 26px;
    border-top: 1px solid var(--line);
}

.hero-metrics dt {
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 600;
    color: var(--paper);
    font-variant-numeric: tabular-nums;
}

.hero-metrics dd {
    margin: 6px 0 0;
    font-size: 12.5px;
    color: var(--dim);
    letter-spacing: 0.04em;
}

/* 演示手机:整站主角。JS 弹簧驱动倾斜/触点/摇杆 */
.hero-visual {
    display: flex;
    justify-content: center;
}

.demo-rig {
    perspective: 1100px;
}

.demo-phone {
    width: min(320px, 76vw);
    border: 1px solid var(--line-strong);
    border-radius: 34px;
    padding: 12px;
    background: linear-gradient(160deg, #101815, #0a100d 60%);
    box-shadow:
        0 40px 90px rgba(0, 0, 0, 0.55),
        inset 0 0 0 1px rgba(255, 255, 255, 0.03);
    will-change: transform;
    transform: rotateX(var(--ph-rx, 0deg)) rotateY(var(--ph-ry, 0deg));
    transform-style: preserve-3d;
}

.demo-screen {
    position: relative;
    aspect-ratio: 9 / 18.4;
    border-radius: 24px;
    overflow: hidden;
    cursor: crosshair;
    background:
        linear-gradient(90deg, rgba(190, 235, 210, 0.05) 1px, transparent 1px),
        linear-gradient(0deg, rgba(190, 235, 210, 0.045) 1px, transparent 1px),
        radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--signal) 8%, transparent), transparent 60%),
        #04070a;
    background-size: 24px 24px, 24px 24px, auto, auto;
}

.demo-status {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 3;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.14em;
    color: var(--dim);
    background: linear-gradient(180deg, rgba(4, 7, 10, 0.9), transparent);
}

.demo-status strong {
    color: var(--signal);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.demo-zone {
    position: absolute;
    z-index: 2;
    display: grid;
    place-items: center;
    gap: 2px;
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.14em;
    color: var(--mist);
    border: 1px dashed rgba(190, 235, 210, 0.3);
    border-radius: 12px;
    background: rgba(190, 235, 210, 0.03);
    transition: border-color 250ms var(--spr-settle), background 250ms var(--spr-settle), transform 400ms var(--spr-pop), color 250ms var(--spr-settle);
}

.demo-zone i {
    font-style: normal;
    font-size: 10px;
    color: var(--dim);
    letter-spacing: 0.3em;
}

.demo-zone-jump {
    right: 9%;
    bottom: 22%;
    width: 64px;
    height: 64px;
    border-radius: 50%;
}

.demo-zone-fire {
    right: 20%;
    bottom: 42%;
    width: 56px;
    height: 56px;
    border-radius: 50%;
}

.demo-zone.flash {
    border-color: var(--signal);
    color: var(--signal);
    background: color-mix(in srgb, var(--signal) 12%, transparent);
    transform: scale(1.12);
}

/* WASD 摇杆:knob 由 JS 弹簧(欠阻尼)驱动 —— 和产品移动模型同一物理 */
.demo-wheel {
    position: absolute;
    z-index: 2;
    left: 8%;
    bottom: 12%;
    width: 104px;
    height: 104px;
    border: 1px dashed rgba(190, 235, 210, 0.3);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(190, 235, 210, 0.045), transparent 70%);
}

.demo-wheel i {
    position: absolute;
    left: 50%;
    bottom: -22px;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-style: normal;
    font-size: 9px;
    letter-spacing: 0.3em;
    color: var(--dim);
    white-space: nowrap;
}

.demo-knob {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 42px;
    height: 42px;
    margin: -21px 0 0 -21px;
    border-radius: 50%;
    border: 1.5px solid var(--signal);
    background: color-mix(in srgb, var(--signal) 14%, transparent);
    box-shadow: 0 0 18px color-mix(in srgb, var(--signal) 30%, transparent);
    will-change: transform;
}

/* 映射触点(手机屏内) */
.demo-contact {
    position: absolute;
    z-index: 4;
    left: 0;
    top: 0;
    width: 30px;
    height: 30px;
    margin: -15px 0 0 -15px;
    will-change: transform;
    opacity: 0;
    transition: opacity 300ms var(--spr-settle);
}

.demo-contact.on {
    opacity: 1;
}

.demo-contact::before {
    content: "";
    position: absolute;
    inset: 0;
    border: 1.5px solid var(--signal);
    border-radius: 50%;
    box-shadow: 0 0 18px color-mix(in srgb, var(--signal) 45%, transparent);
    transition: transform 300ms var(--spr-pop);
}

.demo-contact.press::before {
    transform: scale(0.72);
}

.demo-contact span {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 5px;
    height: 5px;
    margin: -2.5px 0 0 -2.5px;
    border-radius: 50%;
    background: var(--signal);
}

.demo-ripple {
    position: absolute;
    z-index: 3;
    width: 10px;
    height: 10px;
    margin: -5px 0 0 -5px;
    border: 1.5px solid var(--signal);
    border-radius: 50%;
    opacity: 0.9;
    animation: tfRipple 600ms var(--spr-settle) forwards;
    pointer-events: none;
}

.demo-caption {
    margin-top: 14px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--dim);
}

/* ---------- 10. 三种链路卡片 ---------- */

.mode-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}

.mode-card {
    position: relative;
    padding: 30px 26px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background:
        radial-gradient(340px circle at var(--mx, 50%) var(--my, 0%), color-mix(in srgb, var(--signal) 7%, transparent), transparent 72%),
        var(--panel);
    overflow: hidden;
    will-change: transform;
    transition: border-color 350ms var(--spr-settle);
}

.mode-card:hover {
    border-color: color-mix(in srgb, var(--signal) 40%, var(--line));
}

.mode-index {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.24em;
    color: var(--signal);
    border: 1px solid color-mix(in srgb, var(--signal) 35%, transparent);
    border-radius: 6px;
    padding: 4px 10px;
    margin-bottom: 20px;
}

.mode-card h3 {
    font-size: 21px;
    margin-bottom: 12px;
}

.mode-card > p {
    margin: 0 0 18px;
    color: var(--mist);
    font-size: 14.5px;
    line-height: 1.75;
}

.mode-card ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 9px;
    font-size: 13.5px;
    color: var(--dim);
}

.mode-card li::before {
    content: "· ";
    color: var(--signal);
    font-weight: 700;
}

/* ---------- 11. P4 段(琥珀身份色) ---------- */

.p4-section {
    --sec: var(--solder);
}

.p4-section .eyebrow {
    color: var(--sec);
}

.p4-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 44px;
    align-items: start;
}

.p4-board {
    position: relative;
    min-height: 460px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    overflow: hidden;
    padding: 18px;
}

.p4-flow {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.p4-flow-track,
.p4-flow-line,
.p4-flow-spark {
    fill: none;
    vector-effect: non-scaling-stroke;
    stroke-linecap: round;
}

.p4-flow-track {
    stroke: rgba(190, 235, 210, 0.1);
    stroke-width: 1.6;
    stroke-dasharray: 0.008 0.014;
}

.p4-flow-line {
    stroke: var(--sec);
    stroke-width: 2;
    stroke-dasharray: var(--p4f, 0) 1;
    opacity: 0.75;
    filter: drop-shadow(0 0 8px color-mix(in srgb, var(--sec) 55%, transparent));
}

.p4-flow-spark {
    stroke: color-mix(in srgb, var(--sec) 55%, white);
    stroke-width: 3.4;
    stroke-dasharray: 0.03 0.97;
    stroke-dashoffset: calc(0.03 - var(--p4f, 0));
    filter: drop-shadow(0 0 12px var(--sec));
}

.p4-node {
    position: relative;
    z-index: 1;
    width: min(66%, 250px);
    margin: 0 0 26px;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel-solid);
    display: grid;
    gap: 3px;
}

.p4-node span {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.24em;
    color: var(--sec);
}

.p4-node strong {
    font-size: 15px;
}

.p4-node small {
    color: var(--dim);
    font-size: 12px;
}

.p4-node-input {
    margin-left: 0;
}

.p4-node-chip {
    margin-left: auto;
    border-color: color-mix(in srgb, var(--sec) 40%, var(--line));
    box-shadow: 0 0 30px color-mix(in srgb, var(--sec) 12%, transparent);
}

.p4-node-chip i {
    position: absolute;
    right: -1px;
    width: 8px;
    height: 1.5px;
    background: color-mix(in srgb, var(--sec) 60%, transparent);
}

.p4-node-chip i:nth-of-type(1) { top: 16px; }
.p4-node-chip i:nth-of-type(2) { top: 26px; }
.p4-node-chip i:nth-of-type(3) { top: 36px; }
.p4-node-chip i:nth-of-type(4) { top: 46px; }

.p4-node-config {
    margin-left: 0;
}

.p4-node-android {
    margin: 0 auto;
    border-color: color-mix(in srgb, var(--signal) 35%, var(--line));
}

.p4-node-android span {
    color: var(--signal);
}

.p4-facts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.p4-facts article {
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    display: grid;
    gap: 8px;
    transition: border-color 350ms var(--spr-settle), translate 450ms var(--spr-pop);
}

.p4-facts article:hover {
    border-color: color-mix(in srgb, var(--sec) 40%, var(--line));
    translate: 0 -3px;
}

.p4-facts strong {
    font-size: 15px;
}

.p4-facts span {
    color: var(--dim);
    font-size: 13px;
    line-height: 1.7;
}

.p4-advantage {
    margin-top: 18px;
    padding: 22px 24px;
    border: 1px solid color-mix(in srgb, var(--sec) 30%, var(--line));
    border-radius: var(--radius);
    background:
        radial-gradient(400px circle at 0% 0%, color-mix(in srgb, var(--sec) 8%, transparent), transparent 70%),
        var(--panel);
}

.p4-advantage span {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--sec);
}

.p4-advantage p {
    margin: 10px 0 0;
    color: var(--mist);
    font-size: 14px;
    line-height: 1.8;
}

/* P4 独占 · QInEX 个性摇杆模型 */
.motion-model {
    position: relative;
    margin-top: 38px;
    padding: 34px;
    border: 1px solid color-mix(in srgb, var(--sec) 42%, var(--line));
    border-radius: 16px;
    background:
        linear-gradient(90deg, color-mix(in srgb, var(--sec) 4%, transparent) 1px, transparent 1px),
        linear-gradient(0deg, color-mix(in srgb, var(--sec) 3%, transparent) 1px, transparent 1px),
        radial-gradient(620px circle at 8% 18%, color-mix(in srgb, var(--sec) 12%, transparent), transparent 68%),
        var(--panel);
    background-size: 38px 38px, 38px 38px, auto, auto;
    overflow: hidden;
    box-shadow: inset 0 1px 0 color-mix(in srgb, var(--sec) 12%, transparent);
}

.motion-model::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 3px;
    background: linear-gradient(180deg, transparent, var(--sec) 22%, var(--signal) 72%, transparent);
    opacity: 0.8;
}

.motion-model-head > p {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    color: var(--sec);
    font-size: 11px;
    letter-spacing: 0.2em;
}

.motion-model-head > p span {
    display: inline-block;
    margin-right: 11px;
    padding: 5px 8px;
    border: 1px solid color-mix(in srgb, var(--sec) 58%, transparent);
    border-radius: 4px;
    background: color-mix(in srgb, var(--sec) 10%, transparent);
    color: color-mix(in srgb, var(--sec) 72%, white);
    letter-spacing: 0.14em;
}

.motion-model-head h3 {
    max-width: 860px;
    font-size: clamp(25px, 3.2vw, 40px);
    line-height: 1.2;
    letter-spacing: -0.025em;
}

.motion-model-head > div {
    margin-top: 18px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 28px;
}

.motion-model-head > div p {
    max-width: 760px;
    margin: 0;
    color: var(--mist);
    font-size: 15px;
    line-height: 1.8;
}

.motion-model-head > div strong {
    flex: 0 0 245px;
    padding: 12px 14px;
    border-left: 2px solid var(--signal);
    color: color-mix(in srgb, var(--signal) 68%, var(--paper));
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 600;
    line-height: 1.75;
}

.motion-model-grid {
    margin-top: 30px;
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 24px;
    align-items: stretch;
}

.motion-scope {
    position: relative;
    min-width: 0;
    padding: 18px 18px 14px;
    border: 1px solid color-mix(in srgb, var(--sec) 25%, var(--line));
    border-radius: 12px;
    background: rgba(4, 9, 7, 0.84);
    overflow: hidden;
}

.motion-scope::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.018), transparent 42%);
}

.motion-scope-tag {
    position: absolute;
    top: 16px;
    left: 18px;
    z-index: 2;
    color: var(--dim);
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.2em;
}

.motion-scope svg {
    width: 100%;
    height: auto;
    display: block;
}

.motion-axes path,
.motion-axes circle {
    fill: none;
    stroke: rgba(190, 235, 210, 0.1);
    stroke-width: 1;
    stroke-dasharray: 4 7;
}

.motion-traces path {
    fill: none;
    stroke: color-mix(in srgb, var(--sec) 64%, var(--signal));
    stroke-width: 2;
    stroke-linecap: round;
    stroke-dasharray: 9 7;
    opacity: 0.42;
    animation: motionTrace 5.6s linear infinite;
}

.motion-traces path:nth-child(2) { opacity: 0.68; animation-delay: -1.1s; }
.motion-traces path:nth-child(3) { stroke: var(--signal); opacity: 0.34; animation-delay: -2.2s; }
.motion-traces path:nth-child(4) { opacity: 0.5; animation-delay: -3.3s; }
.motion-traces path:nth-child(5) { stroke: color-mix(in srgb, var(--sec) 82%, white); opacity: 0.55; animation-delay: -4.4s; }

@keyframes motionTrace {
    to { stroke-dashoffset: -64; }
}

@media (prefers-reduced-motion: reduce) {
    .motion-traces path { animation: none; }
}

.motion-origin circle:first-child {
    fill: color-mix(in srgb, var(--signal) 10%, transparent);
    stroke: var(--signal);
    stroke-width: 1.5;
}

.motion-origin circle:last-child {
    fill: var(--signal);
    filter: drop-shadow(0 0 8px var(--signal));
}

.motion-target circle:first-child {
    fill: color-mix(in srgb, var(--sec) 10%, transparent);
    stroke: var(--sec);
    stroke-width: 1.5;
}

.motion-target circle:last-child {
    fill: var(--sec);
    filter: drop-shadow(0 0 10px var(--sec));
}

.motion-scope svg text {
    fill: var(--dim);
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.14em;
}

.motion-readout {
    position: relative;
    z-index: 2;
    margin: -4px 0 0;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 1px solid var(--line);
}

.motion-readout div {
    min-width: 0;
    padding: 13px 10px 3px;
    border-right: 1px solid var(--line);
}

.motion-readout div:last-child { border-right: 0; }

.motion-readout dt {
    color: var(--paper);
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 700;
}

.motion-readout dd {
    margin: 4px 0 0;
    color: var(--dim);
    font-size: 10.5px;
}

.motion-pipeline {
    margin: 0;
    padding: 2px 0;
    list-style: none;
    display: grid;
}

.motion-pipeline li {
    position: relative;
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

.motion-pipeline li:last-child { border-bottom: 0; }

.motion-pipeline li > span {
    width: 38px;
    height: 38px;
    border: 1px solid color-mix(in srgb, var(--sec) 32%, var(--line));
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: var(--sec);
    font-family: var(--font-mono);
    font-size: 10px;
}

.motion-pipeline b {
    display: block;
    margin-bottom: 5px;
    font-size: 14px;
}

.motion-pipeline p {
    margin: 0;
    color: var(--dim);
    font-size: 12.5px;
    line-height: 1.65;
}

.motion-safety {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid color-mix(in srgb, var(--signal) 20%, var(--line));
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 22px;
    align-items: baseline;
}

.motion-safety span {
    color: var(--signal);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
}

.motion-safety p {
    margin: 0;
    color: var(--mist);
    font-size: 12.5px;
    line-height: 1.75;
}

/* ---------- 12. QineScreen 段 ---------- */

.split-section {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 52px;
    align-items: center;
}

.media-frame {
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 10px;
    background: var(--panel);
    will-change: transform;
}

.media-frame img {
    border-radius: 10px;
}

.split-copy > p:not(.eyebrow) {
    margin: 18px 0 0;
    color: var(--mist);
    font-size: 15.5px;
    line-height: 1.8;
}

.feature-list {
    margin-top: 30px;
    display: grid;
    gap: 14px;
}

.feature-list > div {
    display: grid;
    gap: 5px;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-left: 2px solid color-mix(in srgb, var(--signal) 55%, transparent);
    border-radius: 8px;
    background: var(--panel);
    transition: border-color 350ms var(--spr-settle), translate 450ms var(--spr-pop);
}

.feature-list > div:hover {
    border-left-color: var(--signal);
    translate: 4px 0;
}

.feature-list strong {
    font-size: 14.5px;
}

.feature-list span {
    color: var(--dim);
    font-size: 13px;
    line-height: 1.65;
}

/* ---------- 13. 控制台段 ---------- */

.console-section {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 52px;
    align-items: center;
}

.console-copy > p:not(.eyebrow) {
    margin: 18px 0 0;
    color: var(--mist);
    font-size: 15.5px;
    line-height: 1.8;
}

.terminal-shot {
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #070c0a;
    overflow: hidden;
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.45);
}

.terminal-bar {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 11px 14px;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.02);
}

.terminal-bar span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(190, 235, 210, 0.16);
}

.terminal-bar span:first-child {
    background: color-mix(in srgb, var(--velocity) 70%, transparent);
}

.terminal-bar strong {
    margin-left: 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--dim);
}

.terminal-shot pre {
    margin: 0;
    padding: 18px 18px 22px;
    display: grid;
    gap: 9px;
    font-family: var(--font-mono);
    font-size: 12.5px;
    line-height: 1.5;
    color: var(--mist);
    overflow-x: auto;
}

.terminal-shot pre em {
    font-style: normal;
    color: var(--signal);
    font-variant-numeric: tabular-nums;
}

/* 终端行:段落显现后按行弹入 */
html.js .tl {
    opacity: 0;
    transform: translateX(-10px);
}

html.js .terminal-shot.visible .tl {
    opacity: 1;
    transform: none;
    transition:
        opacity 400ms var(--spr-settle) calc(220ms + var(--l) * 130ms),
        transform 550ms var(--spr-pop) calc(220ms + var(--l) * 130ms);
}

.terminal-caret {
    color: var(--signal);
    animation: caretBlink 1.1s steps(1) infinite;
}

@keyframes caretBlink {
    50% {
        opacity: 0;
    }
}

/* ---------- 14. 下载段(走线终点) ---------- */

.download-section {
    padding-bottom: 140px;
}

.download-panel {
    position: relative;
    text-align: center;
    padding: 72px 40px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background:
        radial-gradient(520px circle at 50% -10%, color-mix(in srgb, var(--signal) 10%, transparent), transparent 70%),
        var(--panel);
    overflow: hidden;
    transition: border-color 600ms var(--spr-settle), box-shadow 600ms var(--spr-settle);
}

/* 信号走线到达终点时点亮下载面板 */
body.route-complete .download-panel {
    border-color: color-mix(in srgb, var(--signal) 45%, var(--line));
    box-shadow: 0 0 70px color-mix(in srgb, var(--signal) 12%, transparent);
}

.download-panel > p:not(.eyebrow):not(.download-note) {
    max-width: 560px;
    margin: 18px auto 0;
    color: var(--mist);
    font-size: 15px;
    line-height: 1.8;
}

.download-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
    margin-top: 36px;
}

.download-note {
    margin: 24px 0 0;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.14em;
    color: var(--dim);
}

/* ---------- 14a. 三链路对比表 ---------- */

.cmp-wrap {
    margin-top: 30px;
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
}

table.cmp {
    width: 100%;
    min-width: 680px;
    border-collapse: collapse;
    font-size: 13.5px;
}

.cmp th,
.cmp td {
    padding: 13px 16px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
}

.cmp tbody tr:last-child th,
.cmp tbody tr:last-child td {
    border-bottom: none;
}

.cmp thead th {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--paper);
    background: rgba(255, 255, 255, 0.025);
    white-space: nowrap;
}

.cmp tbody th {
    font-weight: 600;
    color: var(--dim);
    font-size: 12.5px;
    white-space: nowrap;
}

.cmp td {
    color: var(--mist);
}

.cmp td b {
    color: var(--paper);
    font-weight: 600;
}

/* P4 列:旗舰琥珀 */
.cmp .cp4 {
    background: color-mix(in srgb, var(--solder) 5%, transparent);
}

.cmp thead .cp4 {
    color: var(--solder);
}

.cmp .cp4 b {
    color: var(--solder);
}

.chip {
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.16em;
    padding: 1px 7px;
    border-radius: 5px;
    margin-left: 8px;
    vertical-align: 2px;
}

.chip-free {
    color: var(--signal);
    border: 1px solid color-mix(in srgb, var(--signal) 45%, transparent);
}

.chip-flag {
    color: var(--solder);
    border: 1px solid color-mix(in srgb, var(--solder) 55%, transparent);
}

/* ---------- 14b. 一帧的旅程 ---------- */

.journey-grid {
    display: grid;
    grid-template-columns: 1.12fr 1fr;
    gap: 22px;
}

.journey-panel {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    padding: 22px 24px 18px;
}

.journey-panel header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 4px;
}

.journey-panel header span {
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.18em;
    color: var(--mist);
}

.journey-panel header strong {
    font-family: var(--font-mono);
    font-size: 30px;
    font-weight: 600;
    color: var(--signal);
    font-variant-numeric: tabular-nums;
    text-shadow: 0 0 26px color-mix(in srgb, var(--signal) 40%, transparent);
    white-space: nowrap;
}

.journey-panel header strong i {
    font-style: normal;
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--dim);
    margin-left: 6px;
    text-shadow: none;
}

.journey-panel .hop {
    display: grid;
    grid-template-columns: 116px 1fr auto;
    gap: 14px;
    align-items: baseline;
    padding: 11px 0;
    border-bottom: 1px dashed var(--line);
    font-size: 13px;
}

.journey-panel .hop:last-of-type {
    border-bottom: none;
}

.hop span {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--signal);
}

.hop em {
    font-style: normal;
    color: var(--mist);
    line-height: 1.6;
}

.hop b {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    color: var(--paper);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.journey-panel footer {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
    font-size: 12.5px;
    color: var(--dim);
    line-height: 1.7;
}

/* P4 面板:旗舰琥珀 */
.jp-p4 {
    border-color: color-mix(in srgb, var(--solder) 35%, var(--line));
    background:
        radial-gradient(420px circle at 100% 0%, color-mix(in srgb, var(--solder) 8%, transparent), transparent 70%),
        var(--panel);
}

.jp-p4 header strong {
    color: var(--solder);
    text-shadow: 0 0 26px color-mix(in srgb, var(--solder) 45%, transparent);
}

.jp-p4 .hop span,
.jp-p4 .hop b {
    color: var(--solder);
}

.journey-floor {
    margin: 18px 0 26px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    color: var(--dim);
}

.journey-floor::before {
    content: "* ";
    color: var(--signal);
}

/* 0xF5 帧结构 */
.bytes-wrap {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    padding: 18px 18px 14px;
    overflow-x: auto;
}

.bytes {
    display: flex;
    gap: 5px;
    min-width: 680px;
    font-family: var(--font-mono);
}

.byte {
    flex: 1;
    min-width: 46px;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    padding: 8px 4px 7px;
    text-align: center;
    background: var(--panel-solid);
}

.byte em {
    display: block;
    font-style: normal;
    font-size: 12px;
    color: var(--paper);
    white-space: nowrap;
}

.byte small {
    display: block;
    font-size: 8.5px;
    letter-spacing: 0.06em;
    color: var(--dim);
    margin-top: 3px;
    white-space: nowrap;
}

.byte.magic {
    border-color: var(--signal);
    box-shadow: 0 0 14px color-mix(in srgb, var(--signal) 30%, transparent);
}

.byte.magic em {
    color: var(--signal);
}

.byte.f2 {
    opacity: 0.55;
}

.byte.more {
    border-style: dashed;
    background: transparent;
}

.bytes-cap {
    margin: 10px 0 0;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--dim);
    min-width: 680px;
}

/* ---------- 14c. 映射组件军械库 ---------- */

.armory-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 13px;
}

.arm {
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--panel);
    padding: 15px 15px 13px;
    transition: border-color 300ms var(--spr-settle);
}

.arm:hover {
    border-color: color-mix(in srgb, var(--signal) 45%, var(--line));
}

.arm .gl {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 17px;
    color: var(--signal);
    margin-bottom: 8px;
    text-shadow: 0 0 12px color-mix(in srgb, var(--signal) 35%, transparent);
}

.arm:hover .gl {
    animation: armPulse 800ms var(--spr-pop);
}

@keyframes armPulse {
    30% {
        transform: translateY(-3px) scale(1.22);
    }
    100% {
        transform: none;
    }
}

.arm b {
    display: block;
    font-size: 13.5px;
    font-weight: 600;
    margin-bottom: 4px;
}

.arm > span:not(.gl) {
    display: block;
    font-size: 11.5px;
    color: var(--dim);
    line-height: 1.6;
}

.arm.model-exclusive {
    grid-column: span 2;
    position: relative;
    overflow: hidden;
    border-color: color-mix(in srgb, var(--solder) 42%, var(--line));
    background:
        radial-gradient(280px circle at 8% 0%, color-mix(in srgb, var(--solder) 12%, transparent), transparent 68%),
        var(--panel);
}

.arm.model-exclusive::after {
    content: "P4 ONLY";
    position: absolute;
    right: 12px;
    top: 10px;
    color: color-mix(in srgb, var(--solder) 42%, transparent);
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.18em;
}

.arm.model-exclusive .gl {
    color: var(--solder);
    text-shadow: 0 0 12px color-mix(in srgb, var(--solder) 35%, transparent);
}

.arm.model-exclusive b i {
    display: inline-block;
    margin-left: 6px;
    padding: 2px 5px;
    border: 1px solid color-mix(in srgb, var(--solder) 45%, transparent);
    border-radius: 3px;
    color: var(--solder);
    font-family: var(--font-mono);
    font-size: 8px;
    font-style: normal;
    letter-spacing: 0.08em;
    vertical-align: 1px;
}

/* 近期新组件:速度红层级 */
.arm.hot {
    border-color: color-mix(in srgb, var(--velocity) 35%, var(--line));
}

.arm.hot .gl {
    color: var(--velocity);
    text-shadow: 0 0 12px color-mix(in srgb, var(--velocity) 40%, transparent);
}

.arm.hot:hover {
    border-color: color-mix(in srgb, var(--velocity) 60%, var(--line));
}

/* ---------- 14d. P4 指标条 ---------- */

.p4-stats {
    display: flex;
    gap: 36px;
    margin: 0 0 22px;
    padding: 18px 22px;
    border: 1px solid color-mix(in srgb, var(--sec) 30%, var(--line));
    border-radius: var(--radius);
    background:
        radial-gradient(360px circle at 0% 0%, color-mix(in srgb, var(--sec) 7%, transparent), transparent 70%),
        var(--panel);
}

.p4-stats dt {
    font-family: var(--font-mono);
    font-size: 22px;
    font-weight: 600;
    color: var(--sec);
    font-variant-numeric: tabular-nums;
}

.p4-stats dd {
    margin: 4px 0 0;
    font-size: 12px;
    color: var(--dim);
}

/* ---------- 14e. 快速上手(标定点) ---------- */

.qs-steps {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    padding-top: 42px;
}

.qs-steps::before {
    content: "";
    position: absolute;
    top: 15px;
    left: 5%;
    right: 5%;
    border-top: 1px dashed var(--line-strong);
}

.qs-step {
    position: relative;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    padding: 18px 18px 16px;
    transition: border-color 500ms var(--spr-settle) calc(var(--n) * 260ms);
}

.qs-pt {
    position: absolute;
    top: -34px;
    left: calc(50% - 7px);
    width: 13px;
    height: 13px;
    border: 1px solid rgba(190, 235, 210, 0.4);
    rotate: 45deg;
    background: var(--ink);
    transition:
        border-color 400ms var(--spr-soft) calc(var(--n) * 260ms),
        box-shadow 400ms var(--spr-soft) calc(var(--n) * 260ms),
        scale 550ms var(--spr-pop) calc(var(--n) * 260ms);
}

.qs-pt::after {
    content: "";
    position: absolute;
    inset: 3px;
    background: rgba(190, 235, 210, 0.24);
    transition: background 400ms var(--spr-soft) calc(var(--n) * 260ms);
}

.qs-flow.go .qs-pt {
    border-color: var(--signal);
    box-shadow: 0 0 16px color-mix(in srgb, var(--signal) 55%, transparent);
    scale: 1.3;
}

.qs-flow.go .qs-pt::after {
    background: var(--signal);
}

.qs-flow.go .qs-step {
    border-color: color-mix(in srgb, var(--signal) 30%, var(--line));
}

.qs-step i {
    display: block;
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--signal);
    margin-bottom: 8px;
    font-variant-numeric: tabular-nums;
}

.qs-step b {
    display: block;
    font-size: 14.5px;
    margin-bottom: 5px;
}

.qs-step > span:not(.qs-pt) {
    display: block;
    font-size: 12px;
    color: var(--dim);
    line-height: 1.65;
}

.qs-ready {
    margin: 22px 0 0;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.14em;
    color: var(--signal);
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 500ms var(--spr-settle) 1150ms, transform 650ms var(--spr-pop) 1150ms;
}

.qs-flow.go .qs-ready {
    opacity: 1;
    transform: none;
}

/* ---------- 14f. 版本轨迹 ---------- */

.log-shot pre em.lhot {
    color: var(--velocity);
}

/* ---------- 14g. FAQ ---------- */

.faq-list {
    display: grid;
    gap: 12px;
    max-width: 820px;
}

.qa {
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--panel);
    transition: border-color 350ms var(--spr-settle);
}

.qa.open {
    border-color: color-mix(in srgb, var(--signal) 40%, var(--line));
}

.qa-q {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    background: none;
    border: none;
    color: var(--paper);
    font-family: inherit;
    font-size: 14.5px;
    font-weight: 600;
    text-align: left;
    padding: 15px 18px;
    cursor: pointer;
}

.qa-q i {
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 15px;
    color: var(--signal);
    flex-shrink: 0;
}

/* 展开是布局型动画(每帧 reflow),刻意做短;文字层叠加合成器级的
   淡入+位移,让眼睛跟踪 60fps 的那一层 */
.qa-a {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 320ms var(--spr-soft);
}

.qa-a > p {
    overflow: hidden;
    min-height: 0;
    margin: 0;
    padding: 0 18px;
    color: var(--mist);
    font-size: 13.5px;
    line-height: 1.75;
    max-width: 720px;
    opacity: 0;
    transform: translateY(-6px);
    transition: padding 320ms var(--spr-soft), opacity 240ms var(--spr-settle), transform 320ms var(--spr-soft);
}

.qa.open .qa-a {
    grid-template-rows: 1fr;
}

.qa.open .qa-a > p {
    padding-bottom: 16px;
    opacity: 1;
    transform: none;
}

/* ---------- 14h. 生态家族 ---------- */

.family-section {
    padding-top: 30px;
}

.fam-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.fam-card {
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--panel);
    padding: 20px 16px;
    text-align: center;
    transition: border-color 350ms var(--spr-settle), translate 450ms var(--spr-pop);
}

.fam-card:hover {
    translate: 0 -3px;
}

.fam-card i {
    display: block;
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 9.5px;
    letter-spacing: 0.22em;
    color: var(--dim);
    margin-bottom: 9px;
}

.fam-card b {
    display: block;
    font-size: 14.5px;
    margin-bottom: 5px;
}

.fam-card span {
    display: block;
    font-size: 12px;
    color: var(--dim);
    line-height: 1.6;
}

.fam-core {
    border-color: color-mix(in srgb, var(--signal) 40%, var(--line));
}

.fam-core i {
    color: var(--signal);
}

.fam-flag {
    border-color: color-mix(in srgb, var(--solder) 45%, var(--line));
    box-shadow: 0 0 30px color-mix(in srgb, var(--solder) 10%, transparent);
}

.fam-flag i {
    color: var(--solder);
}

/* ---------- 15. 页脚 ---------- */

.site-footer {
    max-width: var(--max);
    margin: 0 auto;
    padding: 26px 0 34px;
    border-top: 1px solid var(--line);
    display: flex;
    justify-content: space-between;
    gap: 14px;
    font-size: 12.5px;
    color: var(--dim);
}

.site-footer span:first-child {
    font-family: var(--font-mono);
    letter-spacing: 0.18em;
    color: var(--mist);
}

/* ---------- 16. 响应式 ---------- */

@media (max-width: 1080px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 60px;
        min-height: 0;
        padding-top: 140px;
    }

    .p4-grid,
    .motion-model-grid,
    .split-section,
    .console-section,
    .journey-grid {
        grid-template-columns: 1fr;
    }

    .mode-grid {
        grid-template-columns: 1fr;
        max-width: 560px;
    }

    .armory-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .fam-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 920px) {
    :root {
        --hud-gap: 16px;
    }

    .hud-ruler,
    .hud-readout,
    .tf,
    .nav-marker {
        display: none;
    }

    .hud-scroll {
        top: 84px;
        bottom: 60px;
        right: 6px;
    }

    .nav-toggle {
        display: flex;
    }

    .site-nav {
        position: absolute;
        top: calc(100% + 10px);
        right: 0;
        left: auto;
        flex-direction: column;
        align-items: stretch;
        min-width: 210px;
        padding: 10px;
        border: 1px solid var(--line);
        border-radius: 12px;
        background: color-mix(in srgb, var(--ink) 92%, transparent);
        backdrop-filter: blur(16px);
        opacity: 0;
        visibility: hidden;
        translate: 0 -8px;
        transition: opacity 300ms var(--spr-settle), translate 400ms var(--spr-pop), visibility 300ms linear;
    }

    .site-nav.open {
        opacity: 1;
        visibility: visible;
        translate: none;
    }

    .site-nav .nav-cta {
        margin-left: 0;
        text-align: center;
        justify-content: center;
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(1) {
        transform: translateY(5.5px) rotate(45deg);
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(3) {
        transform: translateY(-5.5px) rotate(-45deg);
    }
}

@media (max-width: 680px) {
    .section-band {
        padding: 84px 0 40px;
    }

    .hero {
        padding-top: 120px;
    }

    .hero-metrics {
        gap: 26px;
        flex-wrap: wrap;
    }

    .p4-facts {
        grid-template-columns: 1fr;
    }

    .motion-model {
        padding: 24px 20px;
    }

    .motion-model-head > div {
        flex-direction: column;
        gap: 14px;
    }

    .motion-model-head > div strong {
        flex-basis: auto;
        width: 100%;
    }

    .motion-readout {
        grid-template-columns: 1fr 1fr;
    }

    .motion-readout div:nth-child(2) {
        border-right: 0;
    }

    .motion-readout div:nth-child(-n + 2) {
        border-bottom: 1px solid var(--line);
    }

    .motion-safety {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .p4-board {
        min-height: 420px;
    }

    .p4-stats {
        gap: 22px;
        flex-wrap: wrap;
    }

    .qs-steps {
        grid-template-columns: 1fr 1fr;
        padding-top: 0;
    }

    .qs-steps::before,
    .qs-pt {
        display: none;
    }

    .armory-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .journey-panel .hop {
        grid-template-columns: 92px 1fr auto;
        gap: 10px;
    }

    .download-panel {
        padding: 52px 22px;
    }

    .site-footer {
        flex-direction: column;
        gap: 6px;
    }
}

/* ---------- 17. 动效降级 ----------
   核心校准、信号路由与触点跟随器是产品身份的一部分，仍保留完整反馈；
   纯装饰性的个性摇杆轨迹已在对应组件内单独响应 prefers-reduced-motion。 */

/* 触屏设备:无精细指针,跟随器与标尺游标不出场 */
@media (pointer: coarse) {
    .tf,
    .hud-tick {
        display: none;
    }
}