/* ==========================================================================
   FirPE 维护系统 · 官方下载站  —  设计系统
   风格：深色科技风（冷色调 / 玻璃拟态 / 网格光效）
   作者：FirPE 中文站前端
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /* 色板：冷色科技风 */
  --c-bg:        #080b14;
  --c-bg-2:      #0d1220;
  --c-surface:   #121a2b;
  --c-surface-2: #17203a;
  --c-line:      rgba(120, 160, 255, .14);
  --c-line-str:  rgba(120, 160, 255, .30);

  --c-text:      #e8eefc;
  --c-text-2:    #a5b4d4;
  --c-text-3:    #6b7da3;

  --c-brand:     #2f7bff;   /* 主品牌蓝 */
  --c-brand-2:   #00d4ff;   /* 强调青 */
  --c-brand-3:   #7b5cff;   /* 辅助紫 */
  --c-ok:        #21d07a;
  --c-warn:      #ffb020;
  --c-danger:    #ff4d5e;

  --grad-brand: linear-gradient(135deg, #2f7bff 0%, #00d4ff 100%);
  --grad-text:  linear-gradient(100deg, #7fb4ff 0%, #00d4ff 55%, #9d7cff 100%);
  --grad-card:  linear-gradient(160deg, rgba(47,123,255,.13), rgba(0,212,255,.04) 60%, transparent);

  --sh-sm: 0 2px 10px rgba(0, 0, 0, .30);
  --sh-md: 0 12px 34px rgba(0, 0, 0, .40);
  --sh-lg: 0 26px 70px rgba(0, 0, 0, .52);
  --sh-glow: 0 0 0 1px rgba(47,123,255,.28), 0 14px 44px rgba(47,123,255,.22);

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-full: 999px;

  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 24px; --sp-6: 32px; --sp-7: 48px; --sp-8: 64px; --sp-9: 96px;

  --wrap: 1200px;
  --nav-h: 68px;

  --font: "Segoe UI", -apple-system, BlinkMacSystemFont, "PingFang SC",
          "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .28s;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 背景：网格 + 光晕 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(47,123,255,.20), transparent 62%),
    radial-gradient(880px 520px at 6% 4%, rgba(0,212,255,.13), transparent 60%),
    radial-gradient(760px 620px at 50% 108%, rgba(123,92,255,.14), transparent 62%),
    var(--c-bg);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .40;
  background-image:
    linear-gradient(rgba(120,160,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,160,255,.045) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 20%, transparent 80%);
          mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 20%, transparent 80%);
}

img { max-width: 100%; height: auto; display: block; border: 0; }
a { color: var(--c-brand-2); text-decoration: none; transition: color var(--dur) var(--ease); }
a:hover { color: #6ce4ff; }
h1,h2,h3,h4,h5 { margin: 0 0 .6em; line-height: 1.28; font-weight: 800; letter-spacing: -.01em; }
h1 { font-size: clamp(30px, 4.6vw, 52px); }
h2 { font-size: clamp(24px, 3vw, 36px); }
h3 { font-size: clamp(18px, 2vw, 23px); }
p  { margin: 0 0 1em; color: var(--c-text-2); }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; color: var(--c-text-2); }
li { margin-bottom: .4em; }
code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: rgba(47,123,255,.13);
  border: 1px solid var(--c-line);
  border-radius: 5px;
  padding: .12em .45em;
  color: #8ec5ff;
  word-break: break-all;
}
pre {
  font-family: var(--font-mono);
  background: #0a1020;
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-brand);
  border-radius: var(--r-sm);
  padding: var(--sp-4);
  overflow-x: auto;
  font-size: 14px;
  color: #b9d4ff;
  margin: 0 0 var(--sp-4);
}
pre code { background: none; border: 0; padding: 0; color: inherit; }
hr { border: 0; border-top: 1px solid var(--c-line); margin: var(--sp-6) 0; }

::selection { background: rgba(47,123,255,.42); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #0a0e18; }
::-webkit-scrollbar-thumb { background: #23314f; border-radius: 6px; border: 2px solid #0a0e18; }
::-webkit-scrollbar-thumb:hover { background: #33456b; }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--sp-5); }
.section { padding: var(--sp-9) 0; position: relative; }
.section--tight { padding: var(--sp-8) 0; }
.center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--c-brand); color: #fff; padding: 10px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- 标题组 ---------- */
.sec-head { max-width: 760px; margin: 0 auto var(--sp-7); text-align: center; }
.sec-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase;
  color: var(--c-brand-2);
  background: rgba(0,212,255,.09);
  border: 1px solid rgba(0,212,255,.28);
  border-radius: var(--r-full);
  padding: 5px 14px; margin-bottom: var(--sp-4);
}
.sec-tag::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-brand-2); box-shadow: 0 0 10px var(--c-brand-2);
}
.sec-title { margin-bottom: var(--sp-3); }
.sec-desc { color: var(--c-text-2); font-size: 16.5px; margin: 0; }

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 26px;
  font-size: 15.5px; font-weight: 700;
  border-radius: var(--r-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease), border-color var(--dur) var(--ease);
  white-space: nowrap;
  font-family: inherit;
  line-height: 1.2;
}
.btn:active { transform: translateY(1px) scale(.99); }

.btn--primary {
  background: var(--grad-brand); color: #fff;
  box-shadow: 0 10px 30px rgba(47,123,255,.36);
}
.btn--primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 16px 42px rgba(47,123,255,.50); }

.btn--ghost {
  background: rgba(120,160,255,.07); color: var(--c-text);
  border-color: var(--c-line-str);
}
.btn--ghost:hover { color: #fff; background: rgba(120,160,255,.15); border-color: var(--c-brand); transform: translateY(-2px); }

.btn--ok { background: linear-gradient(135deg, #12b866, #21d07a); color: #04160c; box-shadow: 0 10px 28px rgba(33,208,122,.30); }
.btn--ok:hover { color: #04160c; transform: translateY(-2px); }

.btn--lg { padding: 17px 36px; font-size: 17px; }
.btn--block { width: 100%; }
.btn svg { flex: 0 0 auto; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(8,11,20,.72);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav.is-scrolled { background: rgba(8,11,20,.94); border-bottom-color: var(--c-line); box-shadow: var(--sh-sm); }
.nav__inner { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--sp-5);
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4); }

.logo { display: inline-flex; align-items: center; gap: 11px; color: var(--c-text); font-weight: 800; font-size: 19px; letter-spacing: -.01em; }
.logo:hover { color: var(--c-text); }
.logo__mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--grad-brand);
  display: grid; place-items: center;
  box-shadow: 0 6px 18px rgba(47,123,255,.42);
  flex: 0 0 auto;
}
.logo__mark svg { width: 21px; height: 21px; }
.logo__sub { font-size: 11px; font-weight: 600; color: var(--c-text-3); letter-spacing: .06em; display: block; margin-top: -4px; }

.nav__links { display: flex; align-items: center; gap: 4px; }
.nav__links a {
  color: var(--c-text-2); font-size: 14.5px; font-weight: 600;
  padding: 9px 14px; border-radius: var(--r-sm);
  transition: color var(--dur), background var(--dur);
}
.nav__links a:hover, .nav__links a.is-active { color: #fff; background: rgba(120,160,255,.10); }

.nav__cta { display: flex; align-items: center; gap: 10px; }
.nav__toggle {
  display: none; width: 42px; height: 42px; border-radius: 10px;
  background: rgba(120,160,255,.08); border: 1px solid var(--c-line-str);
  cursor: pointer; padding: 0; place-items: center;
}
.nav__toggle span { display: block; width: 19px; height: 2px; background: var(--c-text); border-radius: 2px; position: relative; }
.nav__toggle span::before, .nav__toggle span::after {
  content: ""; position: absolute; left: 0; width: 19px; height: 2px; background: var(--c-text); border-radius: 2px;
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after  { top: 6px; }
.nav.is-open .nav__toggle span { background: transparent; }
.nav.is-open .nav__toggle span::before { top: 0; transform: rotate(45deg); }
.nav.is-open .nav__toggle span::after  { top: 0; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { padding: calc(var(--nav-h) + 72px) 0 var(--sp-9); position: relative; overflow: hidden; }
.hero__grid { display: grid; grid-template-columns: 1.06fr .94fr; gap: var(--sp-8); align-items: center; }

.badge-row { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: var(--sp-5); }
.badge {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12.5px; font-weight: 700;
  padding: 6px 13px; border-radius: var(--r-full);
  background: rgba(120,160,255,.08); border: 1px solid var(--c-line-str); color: var(--c-text-2);
}
.badge--ok { background: rgba(33,208,122,.10); border-color: rgba(33,208,122,.34); color: #6ef0ab; }
.badge--brand { background: rgba(47,123,255,.14); border-color: rgba(47,123,255,.42); color: #93c0ff; }
.badge--warn { background: rgba(255,176,32,.10); border-color: rgba(255,176,32,.34); color: #ffce74; }

.hero__title { margin-bottom: var(--sp-4); }
.hero__lead { font-size: 17.5px; color: var(--c-text-2); max-width: 620px; margin-bottom: var(--sp-5); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 13px; margin-bottom: var(--sp-5); }

.hero__stats { display: flex; flex-wrap: wrap; gap: var(--sp-6); padding-top: var(--sp-5); border-top: 1px solid var(--c-line); }
.stat__num { font-size: 27px; font-weight: 800; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; line-height: 1.1; }
.stat__lbl { font-size: 13px; color: var(--c-text-3); }

/* Hero 视觉 */
.hero__visual { position: relative; }
.shot-frame {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  border: 1px solid var(--c-line-str);
  background: var(--c-surface);
  box-shadow: var(--sh-lg);
}
.shot-frame img { width: 100%; }
.shot-frame--tilt { transform: perspective(1400px) rotateY(-6deg) rotateX(2deg); }
.shot-frame__bar {
  display: flex; align-items: center; gap: 6px;
  padding: 9px 13px; background: #0c1424; border-bottom: 1px solid var(--c-line);
}
.shot-frame__bar i { width: 10px; height: 10px; border-radius: 50%; background: #2b3a5c; }
.shot-frame__bar i:nth-child(1) { background: #ff5f57; }
.shot-frame__bar i:nth-child(2) { background: #febc2e; }
.shot-frame__bar i:nth-child(3) { background: #28c840; }
.shot-frame__bar em { margin-left: 8px; font-style: normal; font-size: 12px; color: var(--c-text-3); font-family: var(--font-mono); }

.float-card {
  position: absolute; display: flex; align-items: center; gap: 10px;
  background: rgba(18,26,43,.92); backdrop-filter: blur(10px);
  border: 1px solid var(--c-line-str); border-radius: var(--r-md);
  padding: 11px 15px; box-shadow: var(--sh-md); font-size: 13.5px; font-weight: 600;
}
.float-card--1 { left: -22px; bottom: 58px; animation: floaty 5.5s ease-in-out infinite; }
.float-card--2 { right: -16px; top: 42px; animation: floaty 5.5s ease-in-out infinite .9s; }
.float-card svg { width: 18px; height: 18px; flex: 0 0 auto; }
.float-card b { display: block; font-size: 13.5px; color: var(--c-text); }
.float-card small { color: var(--c-text-3); font-size: 11.5px; font-weight: 500; }

@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-11px); } }

/* ---------- 安全警示条 ---------- */
.alert {
  display: flex; gap: 14px; align-items: flex-start;
  border-radius: var(--r-md); padding: 16px 20px;
  border: 1px solid var(--c-line-str); background: var(--c-surface);
  margin-bottom: var(--sp-5);
}
.alert--danger { border-color: rgba(255,77,94,.42); background: rgba(255,77,94,.08); }
.alert--warn   { border-color: rgba(255,176,32,.40); background: rgba(255,176,32,.07); }
.alert--ok     { border-color: rgba(33,208,122,.36); background: rgba(33,208,122,.07); }
.alert--info   { border-color: rgba(0,212,255,.34);  background: rgba(0,212,255,.06); }
.alert__ico { flex: 0 0 auto; width: 22px; height: 22px; margin-top: 3px; }
.alert__bd { flex: 1; }
.alert__ttl { font-weight: 800; margin-bottom: 3px; font-size: 15.5px; color: var(--c-text); }
.alert p { margin: 0; font-size: 14.5px; }
.alert--danger .alert__ttl { color: #ff8a95; }
.alert--warn .alert__ttl { color: #ffce74; }
.alert--ok .alert__ttl { color: #6ef0ab; }
.alert--info .alert__ttl { color: #7fe4ff; }

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: var(--sp-5); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  background: var(--c-surface);
  background-image: var(--grad-card);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  overflow: hidden;
}
.card:hover { transform: translateY(-5px); border-color: var(--c-line-str); box-shadow: var(--sh-md); }
.card__ico {
  width: 46px; height: 46px; border-radius: 12px;
  display: grid; place-items: center; margin-bottom: var(--sp-4);
  background: rgba(47,123,255,.14); border: 1px solid rgba(47,123,255,.30);
  color: var(--c-brand-2);
}
.card__ico svg { width: 23px; height: 23px; }
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { font-size: 14.5px; margin: 0; color: var(--c-text-2); }

/* ---------- 版本对比 ---------- */
.ver-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-5); }
.ver {
  border-radius: var(--r-lg); padding: var(--sp-6);
  border: 1px solid var(--c-line); background: var(--c-surface);
  position: relative; overflow: hidden;
}
.ver--hot { border-color: rgba(47,123,255,.46); background-image: var(--grad-card); box-shadow: var(--sh-glow); }
.ver__ribbon {
  position: absolute; top: 16px; right: -34px; transform: rotate(38deg);
  background: var(--grad-brand); color: #fff;
  font-size: 11px; font-weight: 800; letter-spacing: .1em;
  padding: 5px 42px; box-shadow: var(--sh-sm);
}
.ver__name { font-size: 21px; font-weight: 800; margin-bottom: 4px; }
.ver__kern { font-family: var(--font-mono); font-size: 13px; color: var(--c-brand-2); margin-bottom: var(--sp-4); }
.ver__list { list-style: none; padding: 0; margin: 0 0 var(--sp-5); }
.ver__list li {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 14.5px; padding: 7px 0; border-bottom: 1px dashed var(--c-line); color: var(--c-text-2);
}
.ver__list li:last-child { border-bottom: 0; }
.ver__list svg { width: 17px; height: 17px; flex: 0 0 auto; margin-top: 4px; }
.ver__list .y { color: var(--c-ok); }
.ver__list .n { color: var(--c-text-3); }

/* ---------- 截图画廊 ---------- */
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-4); }
.gallery__item {
  position: relative; border-radius: var(--r-md); overflow: hidden;
  border: 1px solid var(--c-line); background: var(--c-surface);
  cursor: zoom-in; display: block;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.gallery__item:hover { transform: translateY(-4px); border-color: var(--c-brand); box-shadow: var(--sh-md); }
.gallery__item img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.gallery__item figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 22px 15px 11px; font-size: 13.5px; font-weight: 600; color: #fff;
  background: linear-gradient(to top, rgba(6,9,16,.94), transparent);
}
.gallery__item--wide { grid-column: 1 / -1; }
.gallery__item--wide img { aspect-ratio: 21/9; }

/* 灯箱 */
.lightbox {
  position: fixed; inset: 0; z-index: 999;
  background: rgba(4,6,12,.94); backdrop-filter: blur(8px);
  display: none; align-items: center; justify-content: center; padding: var(--sp-5);
}
.lightbox.is-open { display: flex; }
.lightbox img { max-width: 94vw; max-height: 88vh; border-radius: var(--r-md); box-shadow: var(--sh-lg); }
.lightbox__close {
  position: absolute; top: 22px; right: 26px; width: 46px; height: 46px;
  border-radius: 50%; border: 1px solid var(--c-line-str); background: rgba(18,26,43,.9);
  color: #fff; font-size: 25px; line-height: 1; cursor: pointer; display: grid; place-items: center;
}
.lightbox__close:hover { background: var(--c-danger); border-color: var(--c-danger); }
.lightbox__cap { position: absolute; bottom: 26px; left: 0; right: 0; text-align: center; color: var(--c-text-2); font-size: 14px; }

/* ---------- 表格 ---------- */
.tbl-wrap { overflow-x: auto; border-radius: var(--r-md); border: 1px solid var(--c-line); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 560px; }
table.tbl th, table.tbl td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--c-line); }
table.tbl thead th { background: #0d1526; color: var(--c-text); font-weight: 700; font-size: 13.5px; white-space: nowrap; }
table.tbl tbody tr:hover { background: rgba(120,160,255,.05); }
table.tbl td { color: var(--c-text-2); }
table.tbl td:first-child { color: var(--c-text); font-weight: 600; }
table.tbl tr:last-child td { border-bottom: 0; }

.fileinfo { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.fileinfo__row {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: #0c1424; border: 1px solid var(--c-line); border-radius: var(--r-sm);
  padding: 11px 15px; font-size: 13.5px;
}
.fileinfo__row span { color: var(--c-text-3); flex: 0 0 auto; }
.fileinfo__row code { background: none; border: 0; padding: 0; color: #8ec5ff; font-size: 12.5px; text-align: right; }

/* ---------- FAQ / 折叠 ---------- */
.acc { border: 1px solid var(--c-line); border-radius: var(--r-md); overflow: hidden; background: var(--c-surface); margin-bottom: 12px; }
.acc__q {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  padding: 17px 52px 17px 20px; font-size: 15.5px; font-weight: 700; color: var(--c-text);
  position: relative; font-family: inherit; line-height: 1.55;
  transition: background var(--dur);
}
.acc__q:hover { background: rgba(120,160,255,.05); }
.acc__q::after {
  content: ""; position: absolute; right: 22px; top: 50%; width: 9px; height: 9px;
  border-right: 2px solid var(--c-brand-2); border-bottom: 2px solid var(--c-brand-2);
  transform: translateY(-70%) rotate(45deg); transition: transform var(--dur) var(--ease);
}
.acc.is-open .acc__q::after { transform: translateY(-30%) rotate(-135deg); }
.acc__a { max-height: 0; overflow: hidden; transition: max-height .38s var(--ease); }
.acc__a-inner { padding: 0 20px 18px; color: var(--c-text-2); font-size: 14.5px; }
.acc__a-inner p:last-child { margin-bottom: 0; }
.acc.is-open .acc__a { max-height: 900px; }

/* ---------- 下载页：双通道 ---------- */
.dl-hero { padding: calc(var(--nav-h) + 56px) 0 var(--sp-6); text-align: center; }

.dl-channels { display: grid; grid-template-columns: 1.02fr .98fr; gap: var(--sp-5); align-items: start; }

.channel {
  border-radius: var(--r-xl); border: 1px solid var(--c-line); background: var(--c-surface);
  padding: var(--sp-6); position: relative; overflow: hidden;
}
.channel--qr { border-color: rgba(0,212,255,.34); background-image: linear-gradient(160deg, rgba(0,212,255,.09), transparent 60%); }
.channel--link { border-color: rgba(47,123,255,.40); background-image: var(--grad-card); }
.channel__step {
  position: absolute; top: 20px; right: 22px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  color: var(--c-text-3); letter-spacing: .1em;
}
.channel__ttl { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 800; margin-bottom: 8px; }
.channel__ttl svg { width: 22px; height: 22px; color: var(--c-brand-2); }
.channel__desc { font-size: 14.5px; color: var(--c-text-2); margin-bottom: var(--sp-5); }

.qr-box {
  background: #fff; border-radius: var(--r-md); padding: 15px;
  width: fit-content; margin: 0 auto var(--sp-4);
  box-shadow: 0 0 0 1px rgba(0,212,255,.5), 0 16px 40px rgba(0,0,0,.4);
  position: relative;
}
.qr-box img { width: 218px; height: 218px; }
.qr-box::before, .qr-box::after {
  content: ""; position: absolute; width: 22px; height: 22px; border: 3px solid var(--c-brand-2);
}
.qr-box::before { top: -7px; left: -7px; border-right: 0; border-bottom: 0; border-radius: 6px 0 0 0; }
.qr-box::after  { bottom: -7px; right: -7px; border-left: 0; border-top: 0; border-radius: 0 0 6px 0; }

.qr-meta { display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; margin-bottom: var(--sp-4); }
.qr-meta span {
  font-size: 12.5px; font-weight: 600; color: var(--c-text-2);
  background: rgba(120,160,255,.08); border: 1px solid var(--c-line);
  border-radius: var(--r-full); padding: 5px 12px;
}

.pwd-chip {
  display: inline-flex; align-items: center; gap: 9px;
  background: #0c1424; border: 1px dashed var(--c-line-str); border-radius: var(--r-sm);
  padding: 9px 15px; font-size: 14px; margin: 0 auto var(--sp-4);
}
.pwd-chip b { font-family: var(--font-mono); font-size: 16px; color: var(--c-brand-2); letter-spacing: .12em; }

.copy-btn {
  margin-left: 4px; background: rgba(47,123,255,.16); border: 1px solid rgba(47,123,255,.4);
  color: #93c0ff; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: var(--r-full);
  cursor: pointer; font-family: inherit; transition: background var(--dur);
}
.copy-btn:hover { background: rgba(47,123,255,.30); }
.copy-btn.is-done { background: rgba(33,208,122,.22); border-color: rgba(33,208,122,.5); color: #6ef0ab; }

.link-box {
  display: flex; align-items: center; gap: 10px;
  background: #0a1020; border: 1px solid var(--c-line); border-radius: var(--r-sm);
  padding: 12px 15px; margin-bottom: var(--sp-4); font-size: 13px;
  font-family: var(--font-mono); color: #8ec5ff; word-break: break-all; line-height: 1.5;
}

.divider-or { display: flex; align-items: center; gap: 14px; margin: var(--sp-6) 0; color: var(--c-text-3); font-size: 13px; font-weight: 700; letter-spacing: .1em; }
.divider-or::before, .divider-or::after { content: ""; flex: 1; height: 1px; background: var(--c-line); }

/* 安全检测块 */
.sec-check {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px; margin-top: var(--sp-5);
}
.sec-check__item {
  display: flex; gap: 11px; align-items: flex-start;
  background: rgba(33,208,122,.06); border: 1px solid rgba(33,208,122,.24);
  border-radius: var(--r-md); padding: 14px 16px;
}
.sec-check__item svg { width: 20px; height: 20px; color: var(--c-ok); flex: 0 0 auto; margin-top: 3px; }
.sec-check__item b { display: block; font-size: 14.5px; color: var(--c-text); margin-bottom: 2px; }
.sec-check__item small { color: var(--c-text-2); font-size: 12.8px; line-height: 1.6; }
.sec-check__item--warn { background: rgba(255,176,32,.06); border-color: rgba(255,176,32,.24); }
.sec-check__item--warn svg { color: var(--c-warn); }

.scan-strip {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap; justify-content: space-between;
  background: linear-gradient(100deg, rgba(33,208,122,.12), rgba(0,212,255,.07));
  border: 1px solid rgba(33,208,122,.30); border-radius: var(--r-lg);
  padding: 18px 24px; margin-top: var(--sp-5);
}
.scan-strip__l { display: flex; align-items: center; gap: 13px; }
.scan-strip__l svg { width: 34px; height: 34px; color: var(--c-ok); flex: 0 0 auto; }
.scan-strip__l b { display: block; font-size: 16px; color: var(--c-text); }
.scan-strip__l small { color: var(--c-text-2); font-size: 13px; }

/* ---------- 步骤 ---------- */
.steps { counter-reset: s; display: grid; gap: var(--sp-4); }
.step {
  display: flex; gap: var(--sp-4); align-items: flex-start;
  background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-md);
  padding: var(--sp-5);
  transition: border-color var(--dur), transform var(--dur) var(--ease);
}
.step:hover { border-color: var(--c-line-str); transform: translateX(4px); }
.step__n {
  counter-increment: s; flex: 0 0 auto;
  width: 38px; height: 38px; border-radius: 11px;
  background: var(--grad-brand); color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: 16px;
  box-shadow: 0 6px 16px rgba(47,123,255,.34); font-family: var(--font-mono);
}
.step__n::before { content: counter(s, decimal-leading-zero); }
.step__bd h3 { font-size: 17px; margin-bottom: 6px; }
.step__bd p { margin: 0; font-size: 14.5px; }

/* ---------- 文档站布局 ---------- */
.doc-layout { display: grid; grid-template-columns: 246px 1fr; gap: var(--sp-7); align-items: start; padding-top: calc(var(--nav-h) + 40px); }
.doc-side { position: sticky; top: calc(var(--nav-h) + 20px); }
.doc-side__ttl { font-size: 12px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--c-text-3); margin-bottom: var(--sp-3); padding-left: 14px; }
.doc-side nav { display: flex; flex-direction: column; gap: 2px; border-left: 1px solid var(--c-line); }
.doc-side nav a {
  color: var(--c-text-2); font-size: 14.5px; font-weight: 600;
  padding: 9px 14px; border-left: 2px solid transparent; margin-left: -1px;
  transition: color var(--dur), border-color var(--dur), background var(--dur);
}
.doc-side nav a:hover { color: #fff; background: rgba(120,160,255,.06); }
.doc-side nav a.is-active { color: var(--c-brand-2); border-left-color: var(--c-brand-2); background: rgba(0,212,255,.06); }
.doc-side__foot { margin-top: var(--sp-5); padding: var(--sp-4); border: 1px solid var(--c-line); border-radius: var(--r-md); background: var(--c-surface); font-size: 13px; color: var(--c-text-3); }

.doc-body { min-width: 0; padding-bottom: var(--sp-9); }
.doc-body h1 { font-size: clamp(26px, 3.4vw, 38px); margin-top: 0; }
.doc-body h2 { margin-top: var(--sp-7); padding-top: var(--sp-3); font-size: 25px; }
.doc-body h2::before { content: ""; display: block; width: 34px; height: 3px; background: var(--grad-brand); border-radius: 3px; margin-bottom: 14px; }
.doc-body h3 { margin-top: var(--sp-5); font-size: 19px; color: #c8d8f7; }
.doc-body > p, .doc-body > ul, .doc-body > ol { font-size: 15.5px; }
.doc-body img { border-radius: var(--r-md); border: 1px solid var(--c-line); margin: var(--sp-4) 0; box-shadow: var(--sh-sm); }
.doc-body figure { margin: var(--sp-5) 0; }
.doc-body figcaption { text-align: center; font-size: 13px; color: var(--c-text-3); margin-top: 10px; }

.doc-crumb { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 13px; color: var(--c-text-3); margin-bottom: var(--sp-4); }
.doc-crumb a { color: var(--c-text-2); }
.doc-crumb a:hover { color: var(--c-brand-2); }
.doc-crumb i { font-style: normal; color: var(--c-text-3); }

.doc-pager { display: flex; justify-content: space-between; gap: var(--sp-4); margin-top: var(--sp-8); padding-top: var(--sp-5); border-top: 1px solid var(--c-line); flex-wrap: wrap; }
.doc-pager a {
  flex: 1 1 220px; border: 1px solid var(--c-line); border-radius: var(--r-md);
  padding: 15px 18px; background: var(--c-surface); transition: border-color var(--dur), transform var(--dur) var(--ease);
}
.doc-pager a:hover { border-color: var(--c-brand); transform: translateY(-3px); }
.doc-pager small { display: block; font-size: 12px; color: var(--c-text-3); margin-bottom: 4px; }
.doc-pager b { color: var(--c-text); font-size: 15px; font-weight: 700; }
.doc-pager .next { text-align: right; }

.doc-toc { background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-md); padding: var(--sp-4) var(--sp-5); margin-bottom: var(--sp-5); }
.doc-toc b { display: block; font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--c-text-3); margin-bottom: 10px; }
.doc-toc ol { margin: 0; padding-left: 1.2em; font-size: 14.5px; }

/* 文档内提示框 */
.note {
  border-radius: var(--r-md); padding: 14px 18px; margin: var(--sp-4) 0;
  border-left: 3px solid var(--c-brand); background: rgba(47,123,255,.08);
  font-size: 14.5px; color: var(--c-text-2);
}
.note b:first-child { color: var(--c-text); }
.note--warn { border-left-color: var(--c-warn); background: rgba(255,176,32,.08); }
.note--danger { border-left-color: var(--c-danger); background: rgba(255,77,94,.08); }
.note--ok { border-left-color: var(--c-ok); background: rgba(33,208,122,.08); }

/* ---------- CTA 区 ---------- */
.cta {
  position: relative; overflow: hidden;
  border-radius: var(--r-xl); border: 1px solid rgba(47,123,255,.34);
  background: linear-gradient(135deg, rgba(47,123,255,.16), rgba(0,212,255,.07) 55%, rgba(123,92,255,.12));
  padding: var(--sp-8) var(--sp-6); text-align: center;
}
.cta::before {
  content: ""; position: absolute; inset: -50%;
  background: radial-gradient(circle at 50% 50%, rgba(0,212,255,.16), transparent 55%);
  animation: pulse 7s ease-in-out infinite;
}
.cta > * { position: relative; z-index: 1; }
@keyframes pulse { 0%,100% { opacity: .5; transform: scale(1); } 50% { opacity: 1; transform: scale(1.08); } }
.cta h2 { margin-bottom: var(--sp-3); }
.cta p { max-width: 620px; margin: 0 auto var(--sp-5); }
.cta__actions { display: flex; flex-wrap: wrap; gap: 13px; justify-content: center; }

/* ---------- 页脚 ---------- */
.foot { border-top: 1px solid var(--c-line); background: rgba(6,9,16,.7); padding: var(--sp-8) 0 var(--sp-5); margin-top: var(--sp-9); }
.foot__grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: var(--sp-6); margin-bottom: var(--sp-6); }
.foot__brand p { font-size: 13.8px; color: var(--c-text-3); margin: var(--sp-3) 0 0; max-width: 320px; }
.foot h4 { font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--c-text-3); margin-bottom: var(--sp-3); }
.foot ul { list-style: none; padding: 0; margin: 0; }
.foot ul li { margin-bottom: 9px; }
.foot ul a { color: var(--c-text-2); font-size: 14px; }
.foot ul a:hover { color: var(--c-brand-2); }
.foot__bottom {
  border-top: 1px solid var(--c-line); padding-top: var(--sp-4);
  display: flex; justify-content: space-between; gap: var(--sp-3); flex-wrap: wrap;
  font-size: 12.8px; color: var(--c-text-3);
}
.foot__bottom p { margin: 0; font-size: 12.8px; color: var(--c-text-3); }

/* ---------- 面包屑（通用） ---------- */
.crumb { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 13px; color: var(--c-text-3); margin-bottom: var(--sp-4); }
.crumb a { color: var(--c-text-2); }
.crumb a:hover { color: var(--c-brand-2); }

/* ---------- 工具类 ---------- */
.mb-0 { margin-bottom: 0 !important; }
.mt-3 { margin-top: var(--sp-3); } .mt-4 { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-5); } .mt-6 { margin-top: var(--sp-6); }
.mb-4 { margin-bottom: var(--sp-4); } .mb-5 { margin-bottom: var(--sp-5); } .mb-6 { margin-bottom: var(--sp-6); }
.hide { display: none !important; }
.mono { font-family: var(--font-mono); }
.small { font-size: 13px; color: var(--c-text-3); }
.txt-c { text-align: center; }

/* 滚动入场动效 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
/* 无 JS 兜底：body 未标记 js-ready 时，内容始终可见（避免 SEO/无脚本环境下空白） */
body:not(.js-ready) .reveal { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  .float-card, .cta::before { animation: none; }
  html { scroll-behavior: auto; }
}

/* 返回顶部 */
.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--grad-brand); color: #fff; border: 0; cursor: pointer;
  display: grid; place-items: center; box-shadow: 0 10px 26px rgba(47,123,255,.42);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity var(--dur), transform var(--dur) var(--ease), visibility var(--dur);
}
.to-top.is-show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { transform: translateY(-3px); }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .foot__grid { grid-template-columns: 1fr 1fr; }
  .hero__grid { grid-template-columns: 1fr; gap: var(--sp-7); }
  .shot-frame--tilt { transform: none; }
  .float-card--1 { left: 8px; bottom: 14px; }
  .float-card--2 { right: 8px; top: 12px; }
}
@media (max-width: 940px) {
  :root { --sp-9: 68px; --sp-8: 50px; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .dl-channels { grid-template-columns: 1fr; }
  .doc-layout { grid-template-columns: 1fr; gap: var(--sp-5); }
  .doc-side { position: static; }
  .doc-side nav { flex-direction: row; flex-wrap: wrap; border-left: 0; gap: 6px; }
  .doc-side nav a { border-left: 0; border: 1px solid var(--c-line); border-radius: var(--r-full); padding: 7px 14px; margin: 0; font-size: 13.5px; }
  .doc-side nav a.is-active { border-color: var(--c-brand-2); background: rgba(0,212,255,.10); }
  .doc-side__foot { display: none; }
}
@media (max-width: 820px) {
  .nav__links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    background: rgba(8,11,20,.98); backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--c-line);
    padding: var(--sp-4) var(--sp-5) var(--sp-5);
    transform: translateY(-12px); opacity: 0; visibility: hidden;
    transition: transform var(--dur) var(--ease), opacity var(--dur), visibility var(--dur);
    max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
  }
  .nav.is-open .nav__links { transform: none; opacity: 1; visibility: visible; }
  .nav__links a { padding: 13px 14px; font-size: 15.5px; border-bottom: 1px solid var(--c-line); border-radius: 0; }
  .nav__toggle { display: grid; }
  .nav__cta .btn { display: none; }
  .gallery { grid-template-columns: 1fr; }
  .gallery__item--wide img { aspect-ratio: 16/9; }
}
@media (max-width: 640px) {
  :root { --sp-9: 54px; --sp-8: 42px; --nav-h: 62px; }
  body { font-size: 15.5px; }
  .wrap { padding: 0 var(--sp-4); }
  .grid--3, .grid--2, .ver-grid { grid-template-columns: 1fr; }
  .hero { padding-top: calc(var(--nav-h) + 44px); }
  .hero__stats { gap: var(--sp-5); }
  .stat__num { font-size: 23px; }
  .btn { padding: 12px 20px; font-size: 15px; }
  .btn--lg { padding: 15px 26px; font-size: 16px; }
  .card, .channel, .ver { padding: var(--sp-4); }
  .qr-box img { width: 190px; height: 190px; }
  .float-card { display: none; }
  .foot__grid { grid-template-columns: 1fr; gap: var(--sp-5); }
  .cta { padding: var(--sp-7) var(--sp-4); }
  .to-top { right: 14px; bottom: 14px; width: 42px; height: 42px; }
  .doc-pager a { flex: 1 1 100%; }
  .doc-pager .next { text-align: left; }
}
@media (max-width: 420px) {
  .hero__actions .btn { width: 100%; }
  .qr-box img { width: 164px; height: 164px; }
}