/* ============================================================================
 *  陨落网络验证 · 网站主页样式
 *  ----------------------------------------------------------------------------
 *  设计取向：Linear 极简（参考 故星验证平台 / 花验 / 米验）
 *    · 细边框（#e6e6e6）+ 大留白 + 字重/字色分层，不堆阴影和花哨渐变
 *    · 动效只用 transform / opacity（GPU 合成，滚动不掉帧）
 *    · 全部本地资源，不依赖任何 CDN
 *
 *  目录：
 *    1. tokens / reset        2. 骨架与导航      3. Hero
 *    4. 数据条                5. 平台胶囊        6. 标题
 *    7. 能力卡片              8. 接入流程        9. 公告 / 常见问题
 *   10. 页脚                 11. 动效与入场     12. 响应式
 *   13. 无障碍 / 深色
 * ========================================================================== */

/* ---------------------------------------------------------------- 1. tokens */

:root {
    --ink:      #111;
    --ink-2:    #555;
    --ink-3:    #666;
    --ink-4:    #777;
    --ink-5:    #9aa1ac;

    --line:     #e6e6e6;
    --line-2:   #e0e0e0;
    --line-3:   #d5d5d5;

    --bg:       #fff;
    --soft:     #fafafa;
    --soft-2:   #f5f5f5;

    --ok:       #16a34a;
    --accent:   #111;          /* 主按钮就是纯黑，Linear 那味儿 */
    --accent-2: #2b2b2b;

    --radius:   12px;
    --radius-s: 8px;
    --radius-p: 999px;

    --shell:    1120px;
    --pad:      24px;

    --ease:     cubic-bezier(.22, .61, .36, 1);
    --fast:     .15s;
    --slow:     .7s;

    --nav-h:    65px;
}

* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-h) + 16px);
    -webkit-text-size-adjust: 100%;
}

body.lp {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
                 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    /* 用 clip 而不是 hidden：hidden 会把 body 变成滚动容器，sticky 导航会失灵 */
    overflow-x: clip;
}

body.lp a { color: inherit; text-decoration: none; }
body.lp p { margin: 0; }

/* 细滚动条，别那么土 */
body.lp ::-webkit-scrollbar { width: 10px; height: 10px; }
body.lp ::-webkit-scrollbar-thumb { background: #dcdcdc; border-radius: 99px; border: 3px solid #fff; }
body.lp ::-webkit-scrollbar-thumb:hover { background: #c4c4c4; }

/* ------------------------------------------------------------ 2. 骨架与导航 */

.shell {
    max-width: var(--shell);
    margin: 0 auto;
    padding: 0 var(--pad);
}

.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0);
    border-bottom: 1px solid transparent;
    transition: background var(--fast) linear, border-color var(--fast) linear,
                backdrop-filter var(--fast) linear;
}

/* 阅读进度：导航底下那条线，随滚动从 0 长到 100%（很细，1px） */
.progress {
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 1px;
    background: var(--ink);
    transform: scaleX(0);
    transform-origin: left;
    opacity: 0;
    transition: opacity .2s linear;
}

.nav.is-stuck .progress { opacity: .85; }

/* 往下滚之后：白毛玻璃 + 一条细线 */
.nav.is-stuck {
    background: rgba(255, 255, 255, .78);
    border-bottom-color: var(--line);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
}

.nav-in {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: var(--nav-h);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 16px;
    letter-spacing: -.01em;
}

.brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    background: var(--ink);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 700;
    flex: none;
}

.brand small {
    display: block;
    font-size: 11px;
    font-weight: 500;
    color: var(--ink-4);
    letter-spacing: .02em;
}

.nav nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav nav a {
    color: var(--ink-2);
    font-size: 14px;
    position: relative;
    transition: color var(--fast) linear;
}

.nav nav a:hover { color: var(--ink); }

/* 链接下划线：hover 时从左滑出 */
.nav nav a.link::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 1px;
    background: var(--ink);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .3s var(--ease);
}

.nav nav a.link:hover::after { transform: scaleX(1); }

/* 导航右边的按钮（主 = 纯黑，副 = 白底描边）
   · 未登录：[注册]（黑） + [登录]（描边）
   · 已登录：[进入后台]（黑）—— 点了直接进，不再走登录页 */
.pill {
    background: linear-gradient(180deg, #26262b 0%, #141418 58%, #0d0d10 100%);
    color: #fff !important;
    border: 1px solid #0d0d10;
    padding: 8px 18px;
    border-radius: var(--radius-s);
    font-weight: 600;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .14), 0 1px 2px rgba(17, 17, 17, .18);
    transition: transform var(--fast) var(--ease), box-shadow var(--fast) linear, filter var(--fast) linear;
}

.pill:hover {
    transform: translateY(-1px);
    filter: brightness(1.18);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .18), 0 6px 16px -10px rgba(17, 17, 17, .5);
}

/* 副按钮：白底黑字细描边（跟主按钮并排，一重一轻） */
body.lp .pill-ghost,
body.lp .pill-ghost:visited {
    color: var(--ink) !important;
}

.pill-ghost {
    background: #fff;
    color: var(--ink) !important;
    border-color: var(--line-2);
    box-shadow: none;
}

.pill-ghost:hover {
    background: var(--soft);
    border-color: var(--line-3);
    filter: none;
    box-shadow: 0 6px 16px -12px rgba(17, 17, 17, .35);
}

/* ------------------------------------------------------------------ 3. Hero */

.main {
    display: flex;
    flex-direction: column;
    gap: 84px;
    padding: 60px 0 40px;
}

.hero {
    position: relative;
    isolation: isolate;          /* 让下面那层 -1 的光斑老老实实待在 hero 里 */
    text-align: center;
    padding: 26px 0 0;
}

/* 背后那层极淡的网格 + 光斑，慢慢飘，别抢戏 */
.hero-bg {
    position: absolute;
    left: 0;
    right: 0;
    top: -120px;
    height: 620px;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;            /* 光斑比屏幕宽也没事，这里剪掉，不会横向滚动 */
    -webkit-mask-image: radial-gradient(58% 55% at 50% 34%, #000 40%, transparent 100%);
            mask-image: radial-gradient(58% 55% at 50% 34%, #000 40%, transparent 100%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, rgba(17, 17, 17, .055) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(17, 17, 17, .055) 1px, transparent 1px);
    background-size: 56px 56px;
    transform: translate3d(0, var(--py, 0), 0);
    transition: transform .4s var(--ease);
}

.hero-glow {
    position: absolute;
    left: 50%;
    top: 4%;
    width: 760px;
    height: 420px;
    margin-left: -380px;
    background:
        radial-gradient(closest-side, rgba(17, 17, 17, .085), transparent 70%),
        radial-gradient(closest-side, rgba(37, 99, 235, .10), transparent 72%);
    filter: blur(6px);
    animation: drift 18s var(--ease) infinite alternate;
    transform: translate3d(var(--px, 0), 0, 0);
}

@keyframes drift {
    from { transform: translate3d(calc(var(--px, 0px) - 26px), -10px, 0) scale(1); }
    to   { transform: translate3d(calc(var(--px, 0px) + 26px),  14px, 0) scale(1.06); }
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 6px 14px;
    border: 1px solid var(--line-2);
    border-radius: var(--radius-p);
    background: #fff;
    color: var(--ink-2);
    font-size: 13px;
    font-weight: 600;
}

.eyebrow .dot {
    width: 7px;
    height: 7px;
    border-radius: 99px;
    background: var(--ok);
    position: relative;
}

/* 绿点呼吸 + 扩散环 */
.eyebrow .dot::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 99px;
    border: 1px solid var(--ok);
    opacity: .5;
    animation: pulse 2.2s var(--ease) infinite;
}

@keyframes pulse {
    0%   { transform: scale(.7); opacity: .55; }
    70%  { transform: scale(1.5); opacity: 0; }
    100% { transform: scale(1.5); opacity: 0; }
}

.eyebrow .sep { width: 1px; height: 12px; background: var(--line-2); }

.hero h1 {
    margin: 22px auto 16px;
    max-width: 820px;
    font-size: clamp(32px, 6vw, 56px);
    line-height: 1.1;
    letter-spacing: -.03em;
    font-weight: 700;
    color: var(--ink);
}

.hero h1 .hl {
    background: linear-gradient(180deg, transparent 62%, rgba(17, 17, 17, .08) 62%);
    padding: 0 2px;
}

.hero-sub {
    margin: 0 auto 28px;
    max-width: 640px;
    font-size: 17px;
    line-height: 1.75;
    color: var(--ink-3);
}

.actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 8px;
}

/* 浅色按钮：显式给色，别靠继承（同理，用 body.lp 提优先级） */
body.lp .btn {
    color: var(--ink);
}

body.lp .btn i {
    color: inherit;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 46px;
    padding: 0 24px;
    border-radius: var(--radius-s);
    font-size: 15px;
    font-weight: 600;
    border: 1px solid var(--line-2);
    background: #fff;
    color: var(--ink);
    cursor: pointer;
    transition: transform var(--fast) var(--ease), border-color var(--fast) linear,
                background var(--fast) linear, box-shadow var(--fast) linear;
}

.btn:hover { border-color: var(--line-3); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

/* 主按钮：不是死黑一块，上面微亮、下面更深 + 一点点内高光和外投影，
   一眼能看出「这是个能点的按钮」（Linear / Vercel 那种处理） */
/* ⚠️ 必须写 body.lp .btn-dark（不能只写 .btn-dark）：
   全局那条 `body.lp a { color: inherit }` 的优先级是 (0,1,2)，
   比单独的 .btn-dark (0,1,0) 高 —— 会把黑按钮里的字盖成继承色 #111，
   变成「黑底黑字、大字看不见」。加前缀后是 (0,2,1)，稳赢。 */
body.lp .btn-dark,
body.lp .btn-dark:visited,
body.lp .btn-dark i,
body.lp .btn-dark strong {
    color: #fff !important;
}

.btn-dark {
    background: linear-gradient(180deg, #26262b 0%, #141418 58%, #0d0d10 100%);
    border-color: #0d0d10;
    color: #fff;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, .14),
        0 1px 2px rgba(17, 17, 17, .2),
        0 10px 22px -14px rgba(17, 17, 17, .55);
}

.btn-dark:hover {
    background: linear-gradient(180deg, #32323a 0%, #1b1b21 58%, #131317 100%);
    border-color: #131317;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, .18),
        0 2px 4px rgba(17, 17, 17, .22),
        0 14px 28px -14px rgba(17, 17, 17, .6);
}

.btn-dark:active {
    background: linear-gradient(180deg, #141418 0%, #0d0d10 100%);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, .4);
}

.btn i { font-size: 15px; }

/* 主按钮上那层扫光，hover 时扫一下 */
.btn-dark { position: relative; overflow: hidden; }

.btn-dark::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 40%;
    left: -50%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .28), transparent);
    transform: skewX(-18deg);
    transition: left .55s var(--ease);
}

.btn-dark:hover::after { left: 120%; }

.hint {
    margin-top: 14px;
    font-size: 13px;
    color: var(--ink-5);
}

/* --------------------------------------------------------------- 4. 数据条 */

.stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    margin-top: 40px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--line);
    overflow: hidden;
}

.stat {
    background: #fff;
    padding: 22px 20px;
    text-align: center;
    transition: background var(--fast) linear;
}

.stat:hover { background: var(--soft); }

.stat b {
    display: block;
    font-size: clamp(24px, 3.4vw, 34px);
    font-weight: 700;
    letter-spacing: -.02em;
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
    color: var(--ink);
}

.stat span {
    display: block;
    margin-top: 4px;
    font-size: 13px;
    color: var(--ink-4);
}

/* ------------------------------------------------------------ 5. 平台胶囊 */

.strip {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 26px;
}

.strip span {
    padding: 7px 14px;
    border: 1px solid var(--line-2);
    border-radius: var(--radius-p);
    background: var(--soft);
    color: var(--ink-2);
    font-size: 13px;
    transition: border-color var(--fast) linear, color var(--fast) linear,
                transform var(--fast) var(--ease), background var(--fast) linear;
}

.strip span:hover {
    border-color: var(--line-3);
    color: var(--ink);
    background: #fff;
    transform: translateY(-2px);
}

/* ----------------------------------------------------------------- 6. 标题 */

.head {
    text-align: center;
    margin-bottom: 36px;
}

.head h2 {
    margin: 0 0 10px;
    font-size: clamp(24px, 4vw, 32px);
    font-weight: 700;
    letter-spacing: -.02em;
    color: var(--ink);
}

.head p {
    margin: 0;
    font-size: 15px;
    color: var(--ink-3);
}

/* ------------------------------------------------------------- 7. 能力卡片 */

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

.card {
    position: relative;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    overflow: hidden;
    transition: border-color var(--fast) linear, transform .35s var(--ease),
                box-shadow .35s var(--ease);
}

.card:hover {
    border-color: #bbb;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px -14px rgba(17, 17, 17, .24);
}

/* 鼠标跟到哪里，哪里有一小块极淡的高光 */
.card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(180px 180px at var(--mx, 50%) var(--my, 0%),
                rgba(17, 17, 17, .055), transparent 70%);
    opacity: 0;
    transition: opacity .3s linear;
    pointer-events: none;
}

.card:hover::before { opacity: 1; }

.card .ico {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--soft);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    color: var(--ink);
    margin-bottom: 14px;
    transition: transform .35s var(--ease), background var(--fast) linear;
}

.card:hover .ico { transform: translateY(-2px) scale(1.04); background: var(--soft-2); }

.card strong {
    display: block;
    font-size: 16px;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 8px;
}

.card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--ink-3);
}

.card .tags {
    margin-top: 14px;
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.card .tags em {
    font-style: normal;
    font-size: 12px;
    color: var(--ink-4);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 2px 8px;
    background: var(--soft);
}

/* ------------------------------------------------------------- 8. 接入流程 */

.flow {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 36px;
    position: relative;
}

.flow-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    position: relative;
}

.step {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--soft);
    transition: border-color var(--fast) linear, background var(--fast) linear,
                transform .35s var(--ease);
}

.step:hover { background: #fff; border-color: var(--line-3); transform: translateY(-2px); }

.step b {
    display: block;
    font-size: 22px;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 8px;
    letter-spacing: -.02em;
    font-variant-numeric: tabular-nums;
}

.step strong { display: block; font-size: 15px; color: var(--ink); margin-bottom: 6px; }
.step span { font-size: 14px; line-height: 1.6; color: var(--ink-2); }

/* 步骤之间那条会「长出来」的细线 */
.flow-line {
    position: absolute;
    left: 6%;
    right: 6%;
    top: 50%;
    height: 1px;
    background: var(--line);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 1.1s var(--ease) .15s;
    z-index: -1;
}

.flow.in .flow-line { transform: scaleX(1); }

/* ------------------------------------------------------- 9. 公告 / 常见问题 */

.two {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 16px;
    align-items: start;
}

.panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px;
}

.panel h3 {
    margin: 0 0 16px;
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -.01em;
}

.notice {
    display: flex;
    gap: 12px;
    padding: 14px 0;
    border-top: 1px solid var(--line);
}

.notice:first-of-type { border-top: 0; padding-top: 0; }

.notice .lv {
    flex: none;
    margin-top: 2px;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 6px;
    border: 1px solid var(--line);
    background: var(--soft);
    color: var(--ink-2);
    height: 22px;
    line-height: 18px;
}

.notice .lv.ok      { color: #0f7a3d; border-color: #bfe6cd; background: #f2fbf5; }
.notice .lv.warn    { color: #92610a; border-color: #f0dfb0; background: #fffbf0; }
.notice .lv.danger  { color: #a01b1b; border-color: #f0c4c4; background: #fff5f5; }

.notice strong { display: block; font-size: 14px; color: var(--ink); margin-bottom: 3px; }
.notice p { font-size: 13.5px; color: var(--ink-3); line-height: 1.7; }
.notice time { font-size: 12px; color: var(--ink-5); }

.empty {
    padding: 18px;
    border: 1px dashed var(--line-2);
    border-radius: 10px;
    color: var(--ink-5);
    font-size: 13.5px;
    text-align: center;
    background: var(--soft);
}

.faq { display: flex; flex-direction: column; }

.faq details {
    border-top: 1px solid var(--line);
    padding: 13px 0;
}

.faq details:first-of-type { border-top: 0; padding-top: 0; }

.faq summary {
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary i {
    color: var(--ink-4);
    font-size: 13px;
    transition: transform .3s var(--ease);
}

.faq details[open] summary i { transform: rotate(180deg); }

.faq details p {
    margin: 9px 0 2px;
    font-size: 13.5px;
    line-height: 1.75;
    color: var(--ink-3);
    animation: fadeDown .35s var(--ease);
}

@keyframes fadeDown {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: none; }
}

/* ----------------------------------------------------------------- 10. 页脚 */

.foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    padding: 22px 0;
    margin-top: 56px;
    border-top: 1px solid var(--line);
    color: var(--ink-4);
    font-size: 13px;
}

.foot nav { display: flex; gap: 18px; flex-wrap: wrap; }
.foot nav a { color: var(--ink-4); transition: color var(--fast) linear; }
.foot nav a:hover { color: var(--ink); }

/* --------------------------------------------------------- 11. 动效与入场 */

/* 滚动进场：默认压低 + 透明，进视口后归位 */
.reveal {
    opacity: 0;
    transform: translate3d(0, 16px, 0);
    transition: opacity var(--slow) var(--ease), transform var(--slow) var(--ease);
    transition-delay: var(--d, 0ms);
    will-change: opacity, transform;
}

.reveal.in {
    opacity: 1;
    transform: none;
}

/* Hero 里的几行：进页面就依次浮上来 */
.lift {
    opacity: 0;
    transform: translate3d(0, 14px, 0);
    animation: lift .8s var(--ease) forwards;
    animation-delay: var(--d, 0ms);
}

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

/* 数字滚动时不要跳字宽 */
.num { font-variant-numeric: tabular-nums; }

/* hero 顶部那道细光带（很淡，只为「亮一下」） */
.sheen {
    position: absolute;
    left: 50%;
    top: 0;
    width: min(680px, 86vw);
    height: 1px;
    margin-left: calc(min(680px, 86vw) / -2);
    background: linear-gradient(90deg, transparent, rgba(17, 17, 17, .35), transparent);
    opacity: .8;
}

/* --------------------------------------------------------------- 12. 响应式 */

@media (max-width: 960px) {
    .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .two { grid-template-columns: 1fr; }
    .main { gap: 64px; }
}

@media (max-width: 900px) {
    .flow-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .flow { padding: 24px; }
    .flow-line { display: none; }
}

@media (max-width: 680px) {
    .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
    :root { --pad: 18px; }

    /* 手机上导航要塞「登录 + 注册」两个按钮，间距和留白收紧一点，不会挤出去 */
    .nav nav { gap: 10px; }
    .pill { padding: 7px 13px; font-size: 13.5px; }
    .main { gap: 48px; padding: 40px 0 24px; }
    .grid, .flow-list { grid-template-columns: 1fr; }
    .nav nav a.link { display: none; }
    .hero h1 { margin-top: 18px; }
    .hero-sub { font-size: 15.5px; }
    .stat { padding: 18px 14px; }
    .panel { padding: 20px; }
    .foot { flex-direction: column; align-items: flex-start; gap: 12px; }
    .btn { width: 100%; }
    .actions { gap: 10px; }
}

/* --------------------------------------------------- 13. 无障碍 / 深色偏好 */

/* 用户系统开了「减少动态效果」→ 全部动画关掉，只留静态效果 */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    .reveal, .lift {
        opacity: 1 !important;
        transform: none !important;
        animation: none !important;
        transition: none !important;
    }

    .hero-glow { animation: none; }
    .eyebrow .dot::after { animation: none; }
    .flow-line { transform: scaleX(1); }
    .btn-dark::after { display: none; }
}

/* 系统深色时也顺手适配一下（不改也好看，改了更贴心） */
@media (prefers-color-scheme: dark) {
    body.lp.auto-dark { --bg: #0b0b0c; --soft: #131315; --soft-2: #17171a;
        --ink: #f5f5f5; --ink-2: #a9a9b0; --ink-3: #9a9aa2; --ink-4: #86868e; --ink-5: #6f6f78;
        --line: #232326; --line-2: #2a2a2e; --line-3: #3a3a40; background: var(--bg); }

    body.lp.auto-dark .btn { background: #131315; }
    /* 深色模式下主按钮翻成浅色 → 字必须是深色（要 !important，否则被上面那条白字盖住） */
    body.lp.auto-dark .btn-dark,
    body.lp.auto-dark .btn-dark:visited,
    body.lp.auto-dark .btn-dark i,
    body.lp.auto-dark .btn-dark strong {
        color: #0b0b0c !important;
    }

    body.lp.auto-dark .btn-dark {
        background: #f5f5f5;
        border-color: #f5f5f5;
        box-shadow: 0 1px 2px rgba(0, 0, 0, .45);
    }

    body.lp.auto-dark .btn { color: #f5f5f5; }
    body.lp.auto-dark .nav.is-stuck { background: rgba(11, 11, 12, .78); }
    body.lp.auto-dark .card, body.lp.auto-dark .stat, body.lp.auto-dark .panel,
    body.lp.auto-dark .flow, body.lp.auto-dark .step:hover { background: #131315; }
    body.lp.auto-dark .hero-grid {
        background-image:
            linear-gradient(to right, rgba(255, 255, 255, .05) 1px, transparent 1px),
            linear-gradient(to bottom, rgba(255, 255, 255, .05) 1px, transparent 1px);
    }
    body.lp.auto-dark .hero h1 .hl { background: linear-gradient(180deg, transparent 62%, rgba(255, 255, 255, .12) 62%); }
    body.lp.auto-dark .eyebrow { background: #131315; }
    body.lp.auto-dark .pill {
        background: linear-gradient(180deg, #fafafa 0%, #e9e9ec 100%);
        color: #0b0b0c !important;
        border-color: #e9e9ec;
        box-shadow: 0 1px 2px rgba(0, 0, 0, .4);
    }
    body.lp.auto-dark .pill-ghost { background: #17171a; color: #f5f5f5 !important; border-color: #33333a; }
    body.lp.auto-dark .brand-mark { background: #f5f5f5; color: #0b0b0c; }
}