/* 阿伦海斗官网 · 墨金配色（与软件一致），固定深色 */
:root {
  --bg: #0a0d12;
  --card: #161a23;
  --card-2: #1d2230;
  --line: rgba(236, 239, 244, 0.09);
  --line-gold: rgba(201, 168, 106, 0.35);
  --text: #eceff4;
  --text-2: #b9bfcb;
  --text-3: #7f8796;
  --gold: #c9a86a;
  --gold-hi: #e2c995;
  --ok: #58c4a6;
  --red: #e5534b;
  --f-sans: "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --f-mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
  --wrap: 1120px;
  --gutter: clamp(16px, 4vw, 40px);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; color: var(--text); font: 16px/1.75 var(--f-sans); overflow-x: hidden;
  background:
    radial-gradient(1100px 560px at 85% -8%, rgba(201, 168, 106, 0.12), transparent 60%),
    radial-gradient(900px 520px at -10% 25%, rgba(88, 130, 196, 0.07), transparent 60%),
    var(--bg);
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
::selection { background: var(--gold); color: #0a0d12; }
:focus-visible { outline: 2px solid var(--gold-hi); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.skip { position: absolute; left: -999px; top: 8px; z-index: 60; background: var(--gold); color: #0a0d12; padding: 6px 12px; border-radius: 6px; }
.skip:focus { left: 8px; }

/* ---------- 页头 ---------- */
.head {
  position: sticky; top: 0; z-index: 30; border-bottom: 1px solid var(--line);
  background: rgba(10, 13, 18, 0.82); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.head .wrap { display: flex; align-items: center; gap: 18px; height: 62px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo img { width: 34px; height: 34px; border-radius: 9px; box-shadow: 0 0 0 1px var(--line-gold); }
.logo b { font-size: 18px; letter-spacing: 0.04em; }
.logo small { display: block; font-size: 10px; letter-spacing: 0.32em; color: var(--gold); line-height: 1; margin-top: 2px; }
.nav { margin-left: auto; display: flex; gap: 2px; }
.nav a { text-decoration: none; color: var(--text-2); font-size: 14px; padding: 6px 12px; border-radius: 999px; }
.nav a:hover { color: var(--text); background: var(--card); }
@media (max-width: 720px) { .nav { display: none; } .head .btn { margin-left: auto; } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; text-decoration: none; cursor: pointer;
  font: 700 15px/1 var(--f-sans); padding: 13px 22px; border-radius: 10px; border: 1px solid transparent; white-space: nowrap;
}
.btn-gold { background: linear-gradient(180deg, #ecd5a3, #c9a86a); color: #17120a; box-shadow: 0 10px 30px -12px rgba(201, 168, 106, 0.7); }
.btn-gold:hover { filter: brightness(1.06); }
.btn-ghost { border-color: var(--line-gold); color: var(--gold-hi); background: transparent; }
.btn-ghost:hover { background: rgba(201, 168, 106, 0.08); }
.btn-sm { padding: 9px 14px; font-size: 14px; }
.btn svg { width: 18px; height: 18px; }

/* ---------- 首屏 ---------- */
.hero { padding: clamp(40px, 8vw, 96px) 0 clamp(40px, 6vw, 72px); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(28px, 5vw, 56px); align-items: center; }
@media (max-width: 900px) { .hero .wrap { grid-template-columns: 1fr; } }
.eyebrow { font-size: 13px; letter-spacing: 0.24em; color: var(--gold); margin: 0 0 14px; }
.hero h1 { font-size: clamp(48px, 8vw, 80px); line-height: 1.05; margin: 0 0 6px; letter-spacing: 0.04em; color: var(--gold-hi); font-weight: 800; }
.hero .en { font-size: 13px; letter-spacing: 0.5em; color: var(--text-3); margin: 0 0 24px; }
.hero .lead { font-size: clamp(22px, 2.8vw, 28px); font-weight: 700; line-height: 1.45; margin: 0 0 12px; }
.hero .sub { color: var(--text-2); font-size: 17px; margin: 0 0 28px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.meta { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 22px; font-size: 13px; color: var(--text-3); }
.meta span::before { content: "·"; margin-right: 8px; color: var(--gold); }
.meta span:first-child::before { content: none; }

/* 画面外框 */
.shot { position: relative; margin: 0; border-radius: 12px; overflow: hidden; background: #0d1016; box-shadow: 0 0 0 1px rgba(201, 168, 106, 0.22), 0 30px 60px -30px rgba(0, 0, 0, 0.9); }
.shot img, .shot video { width: 100%; }
.shot--bare { background: transparent; box-shadow: none; overflow: visible; }
.shot--bare img { filter: drop-shadow(0 22px 36px rgba(0, 0, 0, 0.6)); }
.tag-demo {
  position: absolute; top: 10px; left: 10px; z-index: 2; font-size: 12px; font-weight: 700; letter-spacing: 0.06em; line-height: 1;
  padding: 6px 9px; border-radius: 6px; background: rgba(10, 13, 18, 0.8); color: var(--gold-hi); border: 1px solid rgba(201, 168, 106, 0.45);
}
.shot--bare .tag-demo { position: static; display: inline-block; margin-bottom: 10px; }

/* ---------- 区块 ---------- */
.sec { padding: clamp(56px, 9vw, 104px) 0; }
.sec-title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; margin: 0 0 10px; letter-spacing: 0.02em; }
.sec-sub { color: var(--text-2); margin: 0 0 44px; max-width: 36em; }

/* 功能：图文交错 */
.feat { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(22px, 5vw, 60px); align-items: center; }
.feat + .feat { margin-top: clamp(56px, 8vw, 96px); }
.feat.flip > :first-child { order: 2; }
@media (max-width: 860px) { .feat { grid-template-columns: 1fr; } .feat.flip > :first-child { order: 0; } }
.feat .no { font: 700 13px/1 var(--f-mono); color: var(--gold); letter-spacing: 0.1em; }
.feat h3 { font-size: clamp(22px, 2.8vw, 28px); margin: 10px 0 12px; line-height: 1.35; }
.feat p { color: var(--text-2); margin: 0 0 10px; font-size: 16.5px; }
.feat .note { font-size: 13.5px; color: var(--text-3); }
.stack { display: grid; gap: 18px; justify-items: start; }
.shot--narrow { max-width: 460px; }

.tiers { display: flex; height: 42px; border-radius: 8px; overflow: hidden; margin: 18px 0 8px; box-shadow: 0 0 0 1px var(--line); }
.tiers div { display: flex; align-items: center; justify-content: center; font: 800 17px/1 var(--f-mono); }
.t-s { flex: 10; background: #c0392b; color: #fff; }
.t-a { flex: 25; background: #2c7c74; color: #e9fffb; }
.t-b { flex: 35; background: #3a4150; color: #dfe3ea; }
.t-c { flex: 30; background: #232832; color: #9aa2b1; }
.tier-legend { display: flex; flex-wrap: wrap; gap: 4px 16px; margin: 0; padding: 0; list-style: none; font-size: 13px; color: var(--text-2); }
.tier-legend b { font-family: var(--f-mono); color: var(--text); margin-right: 5px; }

/* ---------- 下载 ---------- */
.dl {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px;
}
@media (max-width: 860px) { .dl { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: clamp(22px, 3vw, 30px); }
.card h3 { margin: 0 0 14px; font-size: 19px; }
.card--gold { background: linear-gradient(180deg, rgba(201, 168, 106, 0.14), rgba(201, 168, 106, 0.03)), var(--card); border-color: var(--line-gold); }
.dl-tip { font-size: 13.5px; color: var(--text-3); margin: 14px 0 0; }
.steps { margin: 0; padding: 0; list-style: none; counter-reset: s; }
.steps li { counter-increment: s; position: relative; padding: 0 0 14px 40px; color: var(--text-2); }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 1px; width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; font: 700 13px/1 var(--f-mono); color: #17120a; background: var(--gold);
}
.steps li:last-child { padding-bottom: 0; }
.steps b { color: var(--text); }
.req { margin: 16px 0 0; padding: 14px 16px; border-radius: 10px; background: var(--card-2); font-size: 14px; color: var(--text-2); }
.req b { color: var(--text); }

/* ---------- 安全 ---------- */
.safe { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 860px) { .safe { grid-template-columns: 1fr; } }
.safe .card h3 { font-size: 17px; margin-bottom: 6px; }
.safe .card p { margin: 0; color: var(--text-2); font-size: 15px; }
.safe-note { margin: 18px 0 0; font-size: 14px; color: var(--text-3); }

/* ---------- 常见问题 ---------- */
.faq { display: grid; gap: 10px; max-width: 820px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.faq summary { cursor: pointer; padding: 16px 20px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--gold); font: 400 22px/1 var(--f-mono); }
.faq details[open] summary::after { content: "−"; }
.faq details > div { padding: 0 20px 18px; color: var(--text-2); }
.faq details > div p { margin: 0 0 8px; }

/* ---------- 加群 ---------- */
.group { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: clamp(24px, 5vw, 64px); align-items: center; }
@media (max-width: 760px) { .group { grid-template-columns: 1fr; justify-items: center; text-align: center; } }
.group img { width: 100%; max-width: 300px; border-radius: 16px; background: #fff; }
.group-no { font: 800 clamp(26px, 4vw, 34px)/1.2 var(--f-mono); color: var(--gold-hi); margin: 8px 0 14px; letter-spacing: 0.04em; }
.copy-btn { margin-top: 4px; }

/* ---------- 页脚 ---------- */
.foot { border-top: 1px solid var(--line); padding: 32px 0 40px; font-size: 13px; color: var(--text-3); }
.foot .wrap { display: flex; flex-wrap: wrap; gap: 8px 28px; justify-content: space-between; }
.foot p { margin: 0; }

/* 手机：底部常驻下载条 */
.mbar { display: none; }
@media (max-width: 720px) {
  .mbar {
    display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; gap: 10px; align-items: center;
    padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); background: rgba(10, 13, 18, 0.94); border-top: 1px solid var(--line-gold);
  }
  .mbar span { font-size: 13px; color: var(--text-2); flex: 1; }
  body { padding-bottom: 72px; }
}

/* 进场动效：无 JS / 减少动态时直接可见 */
.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
}

/* 图片放大 */
[data-zoom] { cursor: zoom-in; }
.lightbox { border: 0; padding: 0; background: transparent; max-width: 96vw; max-height: 94vh; }
.lightbox::backdrop { background: rgba(6, 8, 11, 0.9); }
.lightbox img { max-width: 96vw; max-height: 86vh; width: auto; border-radius: 8px; margin: 0 auto; }
.lightbox p { color: #d6d9df; font-size: 14px; text-align: center; margin: 12px 0 0; }
.lightbox button { position: fixed; top: 14px; right: 14px; width: 40px; height: 40px; border-radius: 50%; border: 1px solid rgba(255,255,255,.3); background: rgba(0,0,0,.45); color: #fff; font-size: 20px; cursor: pointer; }