/* 闪电云官网 · 浅色多页面版
   无外部 CDN 依赖：系统字体 + 内联 SVG 图标。 */

:root {
  --brand: #bd2333;
  --brand-hi: #d63445;
  --brand-deep: #9f1d2b;
  --brand-soft: #fdeced;
  --brand-tint: #fff6f5;

  --ink: #1b1d22;
  --ink-2: #3a3f48;
  --muted: #646b76;
  --faint: #9aa0aa;
  --line: #e7e9ee;
  --bg: #ffffff;
  --soft: #f6f7f9;
  --soft-2: #eef1f5;

  --ok: #1fa463;
  --radius: 20px;
  --wrap: 1180px;
  --gutter: 24px;
  --shadow: 0 1px 2px rgba(20, 24, 31, .04), 0 12px 32px -16px rgba(20, 24, 31, .14);
  --shadow-lg: 0 2px 4px rgba(20, 24, 31, .04), 0 30px 60px -28px rgba(20, 24, 31, .22);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg); line-height: 1.65; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p { margin: 0; }
button { font: inherit; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.icon { width: 1em; height: 1em; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ── 排版 ──────────────────────────────── */
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; letter-spacing: .08em; color: var(--ink); }
.eyebrow::before { content: ""; width: 18px; height: 2px; border-radius: 2px; background: currentColor; }
.center .eyebrow::before { display: none; }
.section { padding: 104px 0; position: relative; }
.section.soft { background: var(--soft); }
.section.tint { background: linear-gradient(180deg, var(--brand-tint), #fff); }
.section-head { max-width: 660px; margin-bottom: 52px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 40px); line-height: 1.25; letter-spacing: -.015em; margin: 0 0 14px; font-weight: 700; }
.section-head p { font-size: 17px; color: var(--muted); }
.fineprint { margin-top: 22px; font-size: 12px; color: var(--faint); }

/* ── 按钮 ──────────────────────────────── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 22px; border-radius: 12px; font-size: 15px; font-weight: 600; white-space: nowrap; border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, background .2s ease, box-shadow .2s ease, border-color .2s; }
.btn:active { transform: scale(.97); }
.btn .icon { font-size: 18px; }
.btn-lg { height: 54px; padding: 0 28px; font-size: 16px; }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 10px 24px -12px rgba(189, 35, 51, .7); }
.btn-primary:hover { background: var(--brand-hi); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: #cfd3da; background: var(--soft); }
.btn-text { color: var(--ink); font-weight: 600; display: inline-flex; align-items: center; gap: 6px; font-size: 15px; }
.btn-text:hover { gap: 9px; }
.btn-text, .btn-text .icon { transition: gap .2s ease; }

/* ── 顶栏 ──────────────────────────────── */
.header { position: sticky; top: 0; z-index: 50; height: 68px; display: flex; align-items: center; background: rgba(255,255,255,.86); backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px); border-bottom: 1px solid transparent; transition: border-color .2s, box-shadow .2s; }
.header.scrolled { border-color: var(--line); box-shadow: 0 6px 24px -18px rgba(20,24,31,.3); }
.header .wrap { display: flex; align-items: center; gap: 32px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 19px; color: var(--ink); flex: none; }
.logo img { width: 32px; height: 32px; border-radius: 9px; }
.nav { display: flex; gap: 6px; margin-left: auto; font-size: 15px; }
.nav a { position: relative; padding: 8px 12px; border-radius: 8px; color: var(--ink-2); transition: color .2s, background .2s; }
.nav a:hover { color: var(--ink); background: var(--soft); }
.nav a.active { color: var(--ink); font-weight: 600; }
.nav a.active::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: -14px; height: 2px; border-radius: 2px; background: var(--brand); }
.header .btn { height: 40px; padding: 0 18px; font-size: 14px; border-radius: 10px; }
.menu-btn { display: none; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 10px; background: #fff; align-items: center; justify-content: center; cursor: pointer; color: var(--ink); }
.menu-btn .icon { font-size: 20px; }

/* ── 首页首屏 ───────────────────────────── */
.hero { position: relative; overflow: hidden; padding: 88px 0 110px; background:
  radial-gradient(900px 520px at 88% 10%, #ffe9e7 0%, transparent 60%),
  radial-gradient(700px 500px at 0% 100%, #eef3ff 0%, transparent 60%), #fff; }
.hero .wrap { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(40px, 5.6vw, 66px); line-height: 1.12; letter-spacing: -.03em; font-weight: 800; margin: 0 0 22px; }
.hero h1 em { font-style: normal; color: var(--ink); }
.hero .lead { font-size: 18px; color: var(--muted); max-width: 520px; margin-bottom: 34px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 34px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.tag { display: inline-flex; align-items: center; gap: 7px; height: 34px; padding: 0 14px; border-radius: 999px; font-size: 13px; color: var(--ink-2); background: #fff; border: 1px solid var(--line); }
.tag .icon { font-size: 15px; color: var(--ink); }
.hero-visual { position: relative; }
.hero-visual .device-land { transform: perspective(1600px) rotateY(-8deg) rotateX(3deg); }

/* 横屏手机外框 */
.device-land { position: relative; aspect-ratio: 2.164 / 1; width: 100%; border-radius: 36px; padding: 11px; background: linear-gradient(145deg, #2b2d33, #0f1013); box-shadow: 0 40px 80px -36px rgba(20,24,31,.55), 0 0 0 1px rgba(0,0,0,.06); }
.device-land .screen { position: relative; width: 100%; height: 100%; border-radius: 26px; overflow: hidden; background: #000; }
.device-land .screen img { width: 100%; height: 100%; object-fit: cover; }
.device-land::before { content: ""; position: absolute; left: 20px; top: 50%; width: 8px; height: 60px; transform: translateY(-50%); border-radius: 8px; background: #050505; z-index: 2; }
.float-ball { position: absolute; top: 7%; left: 50%; transform: translateX(-50%); display: flex; align-items: center; gap: 8px; padding: 4px 12px 4px 4px; border-radius: 999px; background: rgba(10,10,10,.55); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,.14); font-size: 11px; line-height: 1.25; color: #fff; }
.float-ball i { width: 26px; height: 26px; border-radius: 50%; background: radial-gradient(circle at 35% 35%, #4be08f, #1c8a52); display: grid; place-items: center; }
.float-ball i svg { width: 14px; height: 14px; stroke: #fff; fill: none; stroke-width: 2; }
.hero-card { position: absolute; z-index: 3; display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-radius: 16px; background: rgba(255,255,255,.94); border: 1px solid var(--line); box-shadow: var(--shadow-lg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); animation: bob 4.5s ease-in-out infinite; }
.hero-card.a { right: -8px; bottom: -36px; min-width: 228px; }
.hero-card.b { left: -18px; top: -30px; animation-delay: -2s; }
.hero-card img { width: 38px; height: 38px; border-radius: 10px; }
.hero-card b { display: block; font-size: 14px; }
.hero-card span { font-size: 12px; color: var(--muted); }
.hero-card .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 4px rgba(31,164,99,.15); margin-left: auto; }
.hero-card .ic { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: var(--brand-soft); color: var(--ink); font-size: 20px; }
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* ── 子页面首屏 ─────────────────────────── */
.page-hero { position: relative; overflow: hidden; padding: 72px 0 80px; background:
  radial-gradient(800px 420px at 90% 0%, #ffecea 0%, transparent 60%),
  radial-gradient(600px 380px at 0% 100%, #eef3ff 0%, transparent 65%), var(--soft); border-bottom: 1px solid var(--line); }
.page-hero .wrap { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.page-hero.compact .wrap { grid-template-columns: 1fr; text-align: center; }
.page-hero.compact .lead { margin-left: auto; margin-right: auto; }
.page-hero.compact .eyebrow::before { display: none; }
.page-hero h1 { font-size: clamp(34px, 4.6vw, 52px); line-height: 1.15; letter-spacing: -.025em; font-weight: 800; margin: 0 0 18px; }
.page-hero .lead { font-size: 18px; color: var(--muted); max-width: 560px; }
.page-hero .hero-cta { margin: 30px 0 0; }
.page-hero .art { justify-self: center; max-width: 460px; width: 100%; filter: drop-shadow(0 30px 40px rgba(40, 60, 120, .12)); }

/* ── 卡片与网格 ─────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.card { padding: 28px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); transition: transform .25s ease, box-shadow .25s ease, border-color .25s; }
a.card:hover, .card.hover:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #dcdfe5; }
.card .ic { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; background: var(--brand-soft); color: var(--ink); font-size: 23px; margin-bottom: 20px; }
.card h3, .card h4 { font-size: 18px; margin-bottom: 8px; }
.card p { font-size: 15px; color: var(--muted); }
.soft .card { border-color: transparent; box-shadow: var(--shadow); }

.product { display: grid; grid-template-rows: auto 1fr; padding: 0; overflow: hidden; }
.product .art { height: 260px; display: grid; place-items: center; background: linear-gradient(160deg, #f2f6ff, #fff4f3); }
.product .art img { max-height: 220px; width: auto; filter: drop-shadow(0 20px 30px rgba(40,60,120,.14)); }
.product .body { padding: 30px 32px 32px; display: flex; flex-direction: column; }
.product h3 { font-size: 24px; margin-bottom: 10px; }
.product p { margin-bottom: 18px; }
.product ul { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 8px; font-size: 14px; color: var(--ink-2); }
.product li { display: flex; gap: 8px; align-items: center; }
.product li .icon { color: var(--ink); font-size: 16px; }
.product .btn-text { margin-top: auto; }

.stat-card { text-align: left; }
.stat-card b { display: block; font-size: 30px; font-weight: 800; color: var(--ink); letter-spacing: -.02em; line-height: 1.2; }
.stat-card span { display: block; font-size: 16px; font-weight: 600; margin: 4px 0 6px; }

/* ── 原理图 ─────────────────────────────── */
.flow { display: grid; grid-template-columns: 1fr 120px 1.2fr 120px 1fr; align-items: center; max-width: 1040px; margin: 0 auto; }
.node { text-align: center; padding: 28px 20px; border-radius: 20px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.node-ic { width: 54px; height: 54px; margin: 0 auto 14px; border-radius: 15px; display: grid; place-items: center; font-size: 25px; color: var(--ink-2); background: var(--soft-2); }
.node b { display: block; font-size: 17px; margin-bottom: 4px; }
.node span { font-size: 13px; color: var(--muted); }
.node.core { padding: 38px 24px; border-color: rgba(189,35,51,.25); background: linear-gradient(180deg, #fff5f4, #fff); box-shadow: 0 30px 60px -30px rgba(189,35,51,.35); }
.node.core .node-ic { background: var(--brand); color: #fff; box-shadow: 0 0 0 8px rgba(189,35,51,.1); }
.node.core b { font-size: 20px; }
.spec { display: flex; justify-content: center; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.spec em { font-style: normal; font-size: 12px; padding: 3px 10px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: var(--ink-2); }
.link { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.link span { font-size: 12px; color: var(--muted); margin-bottom: 8px; white-space: nowrap; }
.link i { position: relative; width: 100%; height: 2px; background: repeating-linear-gradient(90deg, #cfd4dc 0 6px, transparent 6px 12px); overflow: hidden; }
.link i::after { content: ""; position: absolute; top: -2px; left: -20%; width: 20%; height: 6px; border-radius: 6px; background: linear-gradient(90deg, transparent, var(--brand)); animation: packet 1.8s linear infinite; }
.link.down i::after { animation-delay: .9s; }
@keyframes packet { to { left: 110%; } }
@keyframes packet-v { to { top: 110%; } }

/* ── 游戏墙 ─────────────────────────────── */
.marquee { display: grid; gap: 16px; overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent); mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent); }
.track { display: flex; gap: 16px; width: max-content; animation: slide 60s linear infinite; }
.track.reverse { animation-direction: reverse; animation-duration: 50s; }
.marquee:hover .track { animation-play-state: paused; }
@keyframes slide { to { transform: translateX(calc(-50% - 8px)); } }
.m-item { position: relative; flex: none; border-radius: 16px; overflow: hidden; background: var(--soft-2); box-shadow: 0 10px 24px -16px rgba(20,24,31,.4); }
.track.wide .m-item { width: 330px; aspect-ratio: 16 / 9; }
.track.tall .m-item { width: 172px; aspect-ratio: 2 / 3; }
.m-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.m-item:hover img { transform: scale(1.05); }
.m-item::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(0,0,0,.66), transparent 50%); }
.m-item b { position: absolute; left: 14px; bottom: 12px; z-index: 1; font-size: 15px; color: #fff; }

/* ── 图文行 ─────────────────────────────── */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; }
.split + .split { margin-top: 110px; }
.split.rev > .media { order: 2; }
.split .media { position: relative; border-radius: 28px; padding: 36px; background: linear-gradient(160deg, #f2f6ff, #fff4f3); display: grid; place-items: center; min-height: 360px; }
.split .media img { max-height: 340px; width: auto; filter: drop-shadow(0 24px 36px rgba(40,60,120,.14)); }
.split .media.plain { background: none; padding: 0; min-height: 0; }
.split h2 { font-size: clamp(26px, 3.2vw, 36px); line-height: 1.25; letter-spacing: -.015em; margin: 0 0 14px; }
.split .desc { font-size: 16px; color: var(--muted); margin-bottom: 26px; }
.checks { list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; }
.checks li { display: grid; grid-template-columns: 40px 1fr; gap: 14px; align-items: start; }
.checks .ic { width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center; background: var(--brand-soft); color: var(--ink); font-size: 19px; }
.checks h4 { font-size: 16px; margin: 1px 0 3px; }
.checks p { font-size: 14px; color: var(--muted); }

/* 竖屏手机 */
.phones { position: relative; display: flex; justify-content: center; gap: 22px; padding: 10px 0; }
.device-port { position: relative; width: 44%; max-width: 240px; aspect-ratio: 592 / 1280; border-radius: 32px; padding: 8px; background: #16181c; box-shadow: 0 34px 60px -30px rgba(20,24,31,.5); }
.device-port img { width: 100%; height: 100%; object-fit: cover; border-radius: 25px; }
.device-port.offset { margin-top: 60px; }

/* ── 操控 ──────────────────────────────── */
.seg-wrap { text-align: center; }
.seg { display: inline-flex; padding: 4px; border-radius: 12px; background: var(--soft-2); margin: 0 auto 30px; }
.seg button { border: 0; background: transparent; color: var(--muted); height: 38px; padding: 0 18px; border-radius: 9px; cursor: pointer; font-size: 14px; transition: background .2s, color .2s; }
.seg button[aria-pressed="true"] { background: #fff; color: var(--ink); font-weight: 600; box-shadow: 0 2px 6px rgba(20,24,31,.08); }
.control-stage { position: relative; max-width: 940px; margin: 0 auto; }
.control-stage .screen { background: #1a1d26; }
.control-stage .stage-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; filter: brightness(1.15) saturate(1.1); }
.control-stage .screen .ov { position: absolute; inset: 0; transition: opacity .4s ease; }
.control-stage .screen .ov img { position: absolute; height: auto; object-fit: contain; filter: drop-shadow(0 6px 14px rgba(0,0,0,.35)); }
.control-stage[data-view="pad"] .ov-kbm, .control-stage[data-view="kbm"] .ov-pad { opacity: 0; pointer-events: none; }
.control-stage .screen .c-key { position: absolute; aspect-ratio: 1; display: grid; place-items: center; }
.control-stage .screen .c-key img { position: absolute; inset: 0; width: 100%; height: 100%; filter: drop-shadow(0 4px 10px rgba(0,0,0,.35)); }
.control-stage .screen .c-key b { position: relative; color: #fff; font-size: clamp(9px, 1.3vw, 15px); font-weight: 700; letter-spacing: .02em; text-shadow: 0 1px 2px rgba(0,0,0,.5); }
/* 手柄 */
.control-stage .screen .ov-pad .c-ls { left: 7%; bottom: 9%; width: 21%; }
.control-stage .screen .ov-pad .c-abxy { right: 7%; bottom: 11%; width: 21%; }
.control-stage .screen .ov-pad .c-rs { right: 30%; bottom: 6%; width: 13%; }
.control-stage .screen .ov-pad .c-lb { left: 8%; top: 9%; width: 8%; } .ov-pad .c-lt { left: 18%; top: 9%; width: 8%; }
.control-stage .screen .ov-pad .c-rb { right: 8%; top: 9%; width: 8%; } .ov-pad .c-rt { right: 18%; top: 9%; width: 8%; }
/* 键鼠 */
.control-stage .screen .ov-kbm .c-wasd { left: 6%; bottom: 8%; width: 23%; }
.control-stage .screen .ov-kbm .c-ml { right: 6%; bottom: 8%; width: 15%; }
.control-stage .screen .ov-kbm .c-mr { right: 23%; bottom: 30%; width: 11%; }
.control-stage .screen .ov-kbm .c-su { right: 6%; top: 8%; width: 9%; }
.control-stage .screen .ov-kbm .c-sd { right: 16%; top: 8%; width: 9%; }
.control-stage .screen .ov-kbm .k-space { right: 23%; bottom: 6%; width: 11%; }
.control-stage .screen .ov-kbm .k-r { right: 36%; bottom: 8%; width: 8%; }
.control-stage .screen .ov-kbm .k-f { right: 36%; bottom: 32%; width: 8%; }
.control-stage .screen .ov-kbm .k-shift { left: 31%; bottom: 8%; width: 9%; }
.control-stage .screen .ov-kbm .k-q { left: 7%; top: 9%; width: 8%; } .ov-kbm .k-e { left: 17%; top: 9%; width: 8%; }
.ctrl-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; margin-top: 52px; }
.ctrl { text-align: center; padding: 22px 10px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.ctrl .icon { font-size: 26px; color: var(--ink); margin: 0 auto 10px; }
.ctrl b { display: block; font-size: 14px; margin-bottom: 2px; }
.ctrl span { font-size: 12px; color: var(--muted); }

/* ── 下载 ──────────────────────────────── */
.dl-grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.dl-tile { position: relative; display: flex; flex-direction: column; padding: 30px 24px 24px; border-radius: 22px; background: #fff; border: 1px solid var(--line); transition: transform .2s ease, box-shadow .2s ease, border-color .2s; }
.dl-tile:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(189,35,51,.3); }
.dl-tile .ic { width: 54px; height: 54px; border-radius: 15px; display: grid; place-items: center; background: var(--soft-2); color: var(--ink); font-size: 27px; margin-bottom: 22px; }
.dl-tile b { font-size: 20px; }
.dl-tile > span:not(.ic) { font-size: 14px; color: var(--muted); margin-bottom: 26px; }
.dl-tile em { margin-top: auto; font-style: normal; display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600; color: var(--ink); }
.dl-tile em.split-btn { gap: 8px; }
.dl-tile em.split-btn a { flex: 1; text-align: center; padding: 9px 0; border-radius: 10px; background: var(--brand-soft); color: var(--ink); }
.dl-tile em.split-btn a:hover { background: var(--brand); color: #fff; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: step; }
.step { position: relative; padding: 28px; border-radius: 20px; background: #fff; border: 1px solid var(--line); }
.step::before { counter-increment: step; content: "0" counter(step); display: block; font-size: 32px; font-weight: 800; color: var(--ink); opacity: .9; margin-bottom: 10px; letter-spacing: -.02em; }
.step h4 { font-size: 17px; margin-bottom: 6px; }
.step p { font-size: 14px; color: var(--muted); }

/* ── CTA ──────────────────────────────── */
.cta-band { padding: 0 0 104px; }
.cta-box { position: relative; overflow: hidden; display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 48px 56px; border-radius: 28px; background: linear-gradient(120deg, #fff1f0 0%, #fff7f2 50%, #f1f5ff 100%); border: 1px solid #f6dedd; }
.cta-box h2 { font-size: clamp(24px, 3vw, 32px); letter-spacing: -.01em; margin-bottom: 8px; }
.cta-box p { color: var(--muted); }
.cta-box .btns { display: flex; gap: 12px; flex-wrap: wrap; flex: none; }

/* ── FAQ ──────────────────────────────── */
.faq-group + .faq-group { margin-top: 48px; }
.faq-group h3 { font-size: 20px; margin-bottom: 8px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 20px 4px; font-size: 16px; font-weight: 600; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .icon { font-size: 20px; color: var(--ink); transition: transform .25s; }
.faq details[open] summary .icon { transform: rotate(45deg); }
.faq details p { padding: 0 4px 20px; color: var(--muted); font-size: 15px; max-width: 760px; }
.help-layout { display: grid; grid-template-columns: 1fr 320px; gap: 56px; align-items: start; }
.help-aside { position: sticky; top: 92px; display: grid; gap: 16px; }
.contact-card { padding: 24px; border-radius: 18px; background: var(--soft); }
.contact-card h4 { font-size: 16px; margin-bottom: 14px; }
.contact-card p { display: flex; gap: 10px; align-items: center; font-size: 14px; color: var(--ink-2); margin-top: 10px; }
.contact-card .icon { color: var(--ink); font-size: 18px; }
.contact-card a:hover { color: var(--ink); }

/* ── 关于 ──────────────────────────────── */
.prose { font-size: 16px; color: var(--ink-2); }
.prose p + p { margin-top: 16px; }
.about-intro { display: grid; grid-template-columns: 1.2fr 1fr; gap: 64px; align-items: center; }

/* ── 协议 ──────────────────────────────── */
.legal { max-width: 860px; margin: 0 auto; padding: 64px var(--gutter) 96px; }
.legal h1 { font-size: 34px; letter-spacing: -.02em; margin-bottom: 6px; }
.legal .legal-meta { color: var(--faint); font-size: 14px; margin-bottom: 28px; }
.legal hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }
.legal h2 { font-size: 20px; margin: 36px 0 12px; }
.legal p, .legal li { font-size: 15px; color: var(--ink-2); line-height: 1.85; }
.legal p { margin: 10px 0; }
.legal ul { padding-left: 22px; margin: 10px 0; }
.legal a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }

/* ── 页脚 ──────────────────────────────── */
.footer { background: var(--soft); border-top: 1px solid var(--line); padding: 64px 0 34px; font-size: 14px; color: var(--muted); }
.footer-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; padding-bottom: 34px; border-bottom: 1px solid var(--line); }
.footer .logo { margin-bottom: 12px; }
.footer-cols { display: flex; gap: 64px; flex-wrap: wrap; }
.footer-cols div { display: grid; gap: 10px; align-content: start; }
.footer-cols b { color: var(--ink); font-size: 14px; margin-bottom: 4px; }
.footer-cols a:hover { color: var(--ink); }
.health { margin: 26px 0 8px; font-size: 12px; line-height: 1.9; color: var(--faint); }
.copyright { font-size: 12px; color: var(--faint); }
.copyright a:hover { color: var(--ink); }

/* ── 动效 ──────────────────────────────── */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-card, .track, .link i::after { animation: none; }
  html { scroll-behavior: auto; }
}

/* ── 响应式 ─────────────────────────────── */
@media (max-width: 1080px) {
  .nav a { padding: 8px 9px; }
  .ctrl-grid { grid-template-columns: repeat(3, 1fr); }
  .grid-4, .dl-grid4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .section { padding: 76px 0; }
  .nav { display: none; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; gap: 0; padding: 8px var(--gutter) 16px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 20px 30px -20px rgba(20,24,31,.25); }
  .nav.open { display: flex; }
  .nav a { padding: 14px 4px; border-radius: 0; border-bottom: 1px solid var(--soft-2); }
  .nav a.active::after { display: none; }
  .menu-btn { display: inline-flex; margin-left: auto; }
  .header .btn { display: none; }
  .hero, .page-hero { padding: 56px 0 64px; }
  .hero .wrap, .page-hero .wrap, .split, .about-intro, .help-layout { grid-template-columns: 1fr; }
  .hero-visual { margin-top: 20px; }
  .hero-visual .device-land { transform: none; }
  .hero-card.b { left: 6px; top: -24px; }
  .hero-card.a { right: 6px; }
  .page-hero .art { max-width: 340px; }
  .split { gap: 36px; }
  .split.rev > .media { order: 0; }
  .split + .split { margin-top: 72px; }
  .split .media { min-height: 0; padding: 28px; }
  .grid-3, .steps { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; max-width: 420px; }
  .link { height: 64px; }
  .link i { width: 2px; height: 30px; background: repeating-linear-gradient(180deg, #cfd4dc 0 6px, transparent 6px 12px); }
  .link i::after { left: -2px; top: -20%; width: 6px; height: 20%; background: linear-gradient(180deg, transparent, var(--brand)); animation-name: packet-v; }
  .link span { position: absolute; left: calc(50% + 14px); margin: 0; }
  .track.wide .m-item { width: 250px; }
  .track.tall .m-item { width: 136px; }
  .cta-box { flex-direction: column; align-items: flex-start; padding: 36px 28px; }
  .help-aside { position: static; }
}
@media (max-width: 600px) {
  :root { --gutter: 16px; }
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 34px; }
  .hero .lead, .page-hero .lead { font-size: 16px; }
  .hero-cta .btn { flex: 1 1 100%; }
  .device-land { border-radius: 24px; padding: 7px; }
  .device-land .screen { border-radius: 18px; }
  .device-land::before { left: 12px; height: 38px; width: 6px; }
  .float-ball { transform: translateX(-50%) scale(.8); }
  .grid-4, .ctrl-grid { grid-template-columns: repeat(2, 1fr); }
  .dl-grid4 { grid-template-columns: 1fr 1fr; gap: 12px; }
  .dl-tile { padding: 22px 18px 18px; }
  .dl-tile em.split-btn { flex-direction: column; width: 100%; }
  .dl-tile em.split-btn a { width: 100%; white-space: nowrap; }
  .card { padding: 22px; }
  .card.product { padding: 0; }
  .product .art { height: 200px; }
  .product .art img { max-height: 170px; }
  .product .body { padding: 24px; }
  .footer-cols { gap: 36px; }
}

/* ── 游戏库 ────────────────────────────── */
.lib { padding-top: 56px; }
.lib-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.lib-search { flex: 1; max-width: 420px; display: flex; align-items: center; gap: 10px; height: 48px; padding: 0 16px; border-radius: 12px; border: 1px solid var(--line); background: #fff; color: var(--faint); transition: border-color .2s, box-shadow .2s; }
.lib-search:focus-within { border-color: var(--ink); box-shadow: 0 0 0 4px rgba(189,35,51,.1); }
.lib-search .icon { font-size: 19px; }
.lib-search input { flex: 1; min-width: 0; border: 0; outline: 0; font: inherit; font-size: 15px; color: var(--ink); background: transparent; }
.lib-count { font-size: 14px; color: var(--muted); white-space: nowrap; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 30px; }
.chip { height: 34px; padding: 0 14px; border-radius: 999px; border: 1px solid var(--line); background: #fff; color: var(--ink-2); font-size: 13px; cursor: pointer; transition: background .2s, color .2s, border-color .2s; }
.chip:hover { border-color: #cfd3da; }
.chip.on { background: var(--brand); border-color: var(--ink); color: #fff; }
.lib-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 22px 18px; }
.g-card { min-width: 0; }
.g-cover { aspect-ratio: 3 / 4; border-radius: 14px; overflow: hidden; background: var(--soft-2); box-shadow: 0 8px 20px -14px rgba(20,24,31,.45); }
.g-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.g-card:hover .g-cover img { transform: scale(1.05); }
.g-card b { display: block; margin-top: 10px; font-size: 14px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.g-tags { display: flex; gap: 6px; margin-top: 4px; min-height: 20px; }
.g-tags em { font-style: normal; font-size: 11px; padding: 1px 7px; border-radius: 6px; background: var(--soft-2); color: var(--muted); }
.lib-empty { text-align: center; color: var(--muted); padding: 40px 0; }
.lib-more { text-align: center; margin-top: 36px; }
@media (max-width: 600px) {
  .lib-toolbar { flex-direction: column; align-items: stretch; }
  .lib-search { max-width: none; }
  .chips { flex-wrap: nowrap; overflow-x: auto; margin: 0 calc(-1 * var(--gutter)) 24px; padding: 0 var(--gutter); scrollbar-width: none; }
  .chips::-webkit-scrollbar { display: none; }
  .chip { flex: none; }
  .lib-grid { grid-template-columns: repeat(3, 1fr); gap: 16px 10px; }
  .g-card b { font-size: 12px; }
  .g-tags em:nth-child(2) { display: none; }
}

/* ── 首页首屏组合插画 ─────────────────────── */
.hero-compose { min-height: 500px; }
.hero-compose .hv-art { position: absolute; left: 0; top: 50%; width: 66%; transform: translateY(-50%); filter: drop-shadow(0 30px 40px rgba(40,60,120,.16)); }
.hv-covers { position: absolute; right: 0; top: 50%; width: 52%; height: 78%; transform: translateY(-50%); }
.hv-covers img { position: absolute; width: 46%; aspect-ratio: 3 / 4; object-fit: cover; border-radius: 16px; border: 4px solid #fff; box-shadow: 0 24px 40px -18px rgba(20,24,31,.45); }
.hv-covers .c1 { left: 0; top: 22%; transform: rotate(-9deg); }
.hv-covers .c2 { left: 27%; top: 4%; z-index: 2; width: 50%; }
.hv-covers .c3 { right: 0; top: 24%; transform: rotate(9deg); }
.hero-compose .hero-card { z-index: 3; }
.hero-compose .hero-card.a { right: 6%; bottom: 0; }
.hero-compose .hero-card.b { left: 0; top: 2%; }
@media (max-width: 900px) {
  .hero-compose { min-height: 380px; max-width: 560px; margin: 24px auto 0; width: 100%; }
}
@media (max-width: 600px) {
  .hero-compose { min-height: 300px; }
  .hv-covers img { border-width: 3px; border-radius: 12px; }
  .hero-compose .hero-card { padding: 10px 12px; }
  .hero-compose .hero-card b { font-size: 13px; }
  .hero-compose .hero-card span { font-size: 11px; }
  .hero-compose .hero-card img, .hero-compose .hero-card .ic { width: 30px; height: 30px; }
  .hero-compose .hero-card.a { right: 0; min-width: 0; }
}

/* ── 关于我们（精简版） ───────────────────── */
.about-title { font-size: clamp(26px, 3.2vw, 36px); letter-spacing: -.015em; margin: 0 0 20px; }
.about-art { width: 100%; max-width: 420px; margin: 0 auto; filter: drop-shadow(0 30px 40px rgba(40,60,120,.12)); }
.about-contact { list-style: none; padding: 26px 0 0; margin: 30px 0 0; border-top: 1px solid var(--line); display: grid; gap: 14px; }
.about-contact li { display: flex; align-items: center; gap: 12px; font-size: 15px; }
.about-contact .icon { font-size: 19px; color: var(--ink); }
.about-contact span { color: var(--muted); min-width: 64px; }
.about-contact b, .about-contact a { color: var(--ink); font-weight: 600; }
.about-contact a:hover { color: var(--ink); }

/* ── 子页面标题（无独立横幅） ─────────────── */
.section.first { padding-top: 64px; }
.page-head { max-width: 760px; margin-bottom: 40px; }
.page-title { font-size: clamp(30px, 4vw, 42px); line-height: 1.2; letter-spacing: -.02em; font-weight: 800; margin: 0 0 12px; }
.page-lead { font-size: 17px; color: var(--muted); }
.prose .page-lead { margin-bottom: 22px; color: var(--ink-2); font-weight: 500; }
.section-head p .btn-text { margin-left: 6px; }
.cta-band { padding: 96px 0; }
@media (max-width: 600px) { .section.first { padding-top: 40px; } .page-head { margin-bottom: 28px; } }

/* ── 首页首屏插画（仅概念图） ─────────────── */
.hero-art { display: grid; place-items: center; }
.hero-art img { width: 100%; max-width: 560px; filter: drop-shadow(0 36px 50px rgba(40,60,120,.16)); animation: float 6s ease-in-out infinite; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@media (max-width: 900px) { .hero-art img { max-width: 380px; } }
@media (prefers-reduced-motion: reduce) { .hero-art img { animation: none; } }
.dl-tile.is-off:hover { transform: none; box-shadow: none; border-color: var(--line); }
.dl-tile em.muted { color: var(--faint); font-weight: 500; }

/* ── 首页首屏展示优化 ─────────────────────── */
.hero { padding: 72px 0 88px; }
@media (min-width: 901px) { .hero .wrap { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; min-height: 540px; } }
.hero h1 { font-size: clamp(38px, 5vw, 60px); line-height: 1.16; letter-spacing: -.01em; margin-bottom: 24px; text-wrap: balance; }
.hero h1 em { display: inline-block; white-space: nowrap; color: var(--ink); background: none; }
.hero .lead { font-size: 18px; line-height: 1.75; max-width: 30em; margin-bottom: 36px; text-wrap: pretty; }
.hero-cta { gap: 12px; margin-bottom: 28px; }
.hero-tags { gap: 8px; }
.hero .tag { height: 32px; padding: 0 12px; background: rgba(255,255,255,.7); }
.hero-art img { max-width: 520px; }
@media (max-width: 900px) {
  .hero-art img { max-width: 340px; }
}
@media (max-width: 600px) {
  .hero { padding: 40px 0 48px; }
  .hero h1 { font-size: 36px; margin-bottom: 16px; }
  .hero .lead { font-size: 16px; line-height: 1.7; margin-bottom: 28px; }
  .hero-cta { flex-wrap: nowrap; margin-bottom: 20px; }
  .hero-cta .btn { flex: 1 1 0; min-width: 0; height: 48px; padding: 0 12px; font-size: 15px; }
  .hero-tags { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; margin: 0 calc(-1 * var(--gutter)); padding: 0 var(--gutter); }
  .hero-tags::-webkit-scrollbar { display: none; }
  .hero .tag { flex: none; }
  .hero-art img { max-width: 300px; }
}