/* =========================================================
   火红信使 · huohongca.cn — 官方下载站主样式
   品牌色取自 Logo：火焰红 #e8261e / 橙 #ff7a18 / 金 #ffb300
   结构：变量 → 基础 → 组件 → 区块 → 响应式 → 无障碍
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --red: #e8261e;
  --red-deep: #c1170f;
  --red-dark: #8e0d09;
  --orange: #ff7a18;
  --gold: #ffb300;
  --ink: #17181c;
  --ink-soft: #4a4f5a;
  --muted: #6f7683;
  --line: #f0e6e3;
  --bg: #ffffff;
  --bg-soft: #fdf6f4;
  --bg-warm: linear-gradient(160deg, #fff7f4 0%, #fdf1ea 100%);

  --grad-flame: linear-gradient(120deg, #ff9d2f 0%, #ff5a2e 32%, var(--red) 68%, #b4100c 100%);
  --grad-btn: linear-gradient(135deg, #ff5a2e 0%, var(--red) 55%, var(--red-deep) 100%);
  --grad-text: linear-gradient(96deg, #ffd76a 0%, #ff9d2f 45%, #fff 100%);

  --shadow-xs: 0 1px 2px rgba(23, 24, 28, .05);
  --shadow-sm: 0 2px 12px rgba(23, 24, 28, .06);
  --shadow-md: 0 14px 34px rgba(23, 24, 28, .10);
  --shadow-lg: 0 28px 66px rgba(23, 24, 28, .18);
  --shadow-red: 0 14px 34px rgba(232, 38, 30, .32);
  --shadow-red-lg: 0 22px 52px rgba(232, 38, 30, .42);

  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --container: 1180px;
  --header-h: 70px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Hiragino Sans GB",
          -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-num: "DIN Alternate", "Bahnschrift", "Segoe UI", Roboto, var(--font);
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 14px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

img { max-width: 100%; display: block; height: auto; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
h1, h2, h3, h4 { margin: 0 0 .5em; line-height: 1.24; font-weight: 800; letter-spacing: -.02em; }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }
small { font-size: .78em; }
code {
  background: #fff1ee; color: var(--red-deep); padding: .14em .46em;
  border-radius: 6px; font-size: .88em; word-break: break-all;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: clamp(16px, 4vw, 24px); }
.container-narrow { max-width: 840px; }

:focus-visible { outline: 3px solid rgba(232, 38, 30, .55); outline-offset: 2px; border-radius: 6px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 300;
  background: var(--ink); color: #fff; padding: 12px 18px; border-radius: 0 0 12px 0; font-weight: 700;
}
.skip-link:focus { left: 0; }

/* ---------- 3. 按钮 ---------- */
.btn {
  --btn-py: 13px;
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: var(--btn-py) 24px; min-height: 46px;
  border: 0; border-radius: 999px;
  font-size: 15px; font-weight: 800; line-height: 1.1; letter-spacing: .01em;
  cursor: pointer; white-space: nowrap; overflow: hidden;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s, color .2s, border-color .2s;
}
.btn:active { transform: translateY(1px) scale(.988); }
.btn-primary { background: var(--grad-btn); color: #fff; box-shadow: var(--shadow-red); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-red-lg); }
.btn-dark { background: var(--ink); color: #fff; box-shadow: var(--shadow-md); }
.btn-dark:hover { transform: translateY(-2px); background: #000; }
.btn-light { background: #fff; color: var(--red-deep); box-shadow: 0 16px 36px rgba(0, 0, 0, .2); }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 22px 46px rgba(0, 0, 0, .26); }
.btn-ghost { background: rgba(255, 255, 255, .12); color: #fff; border: 1.5px solid rgba(255, 255, 255, .5); backdrop-filter: blur(6px); }
.btn-ghost:hover { background: rgba(255, 255, 255, .24); transform: translateY(-2px); }
.btn-outline { background: #fff; color: var(--red-deep); border: 1.5px solid #f3cfc9; }
.btn-outline:hover { border-color: transparent; background: var(--grad-btn); color: #fff; box-shadow: var(--shadow-red); transform: translateY(-2px); }
.btn-lg { --btn-py: 17px; font-size: 16.5px; padding-inline: 32px; min-height: 54px; }
.btn-sm { --btn-py: 9px; font-size: 14px; padding-inline: 16px; min-height: 38px; }
.btn-block { width: 100%; }

/* 光泽扫过 */
.btn-primary::after, .btn-light::after {
  content: ""; position: absolute; inset: 0 auto 0 -40%; width: 34%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .55), transparent);
  transform: skewX(-18deg); opacity: 0;
}
.btn-primary:hover::after, .btn-light:hover::after { animation: sheen .85s var(--ease); }
@keyframes sheen { 0% { left: -40%; opacity: 0; } 25% { opacity: 1; } 100% { left: 118%; opacity: 0; } }

/* ---------- 4. 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-h);
  display: flex; align-items: center;
  padding-top: env(safe-area-inset-top);
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s, background .3s;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); border-color: var(--line); }
.nav-wrap { display: flex; align-items: center; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; flex: none; }
.brand-logo { border-radius: 11px; box-shadow: 0 3px 10px rgba(232, 38, 30, .25); }
.brand-text { font-size: 20.5px; font-weight: 900; letter-spacing: -.03em; }
.brand-text em { font-style: normal; color: var(--red); }
.main-nav { display: flex; gap: 2px; margin-left: auto; }
.main-nav a {
  position: relative; padding: 9px 13px; border-radius: 10px;
  font-size: 15px; font-weight: 600; color: var(--ink-soft);
  transition: color .2s, background .2s;
}
.main-nav a::after {
  content: ""; position: absolute; left: 50%; bottom: 3px; width: 0; height: 2.5px;
  border-radius: 2px; background: var(--grad-btn); transform: translateX(-50%); transition: width .25s var(--ease);
}
.main-nav a:hover { color: var(--red); background: #fff4f2; }
.main-nav a:hover::after { width: 55%; }
.nav-cta { margin-left: 6px; }
.nav-toggle { display: none; }

/* ---------- 5. Hero ---------- */
.hero {
  position: relative; isolation: isolate; color: #fff; overflow: hidden;
  padding: clamp(38px, 6vw, 68px) 0 clamp(70px, 9vw, 112px);
}
.hero-bg { position: absolute; inset: 0; z-index: -2; background: var(--grad-flame); }
.hero-bg .glow { position: absolute; border-radius: 50%; filter: blur(70px); opacity: .55; }
.hero-bg .glow-a { width: 620px; height: 620px; right: -140px; top: -220px; background: radial-gradient(circle, #ffd166, transparent 65%); }
.hero-bg .glow-b { width: 540px; height: 540px; left: -160px; bottom: -200px; background: radial-gradient(circle, #ff2d55, transparent 65%); opacity: .45; }
.hero-bg .grid-mask {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .09) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(1000px 520px at 50% 0%, #000 20%, transparent 78%);
          mask-image: radial-gradient(1000px 520px at 50% 0%, #000 20%, transparent 78%);
}

.hero-grid {
  display: grid; grid-template-columns: 1.05fr .95fr; align-items: center;
  gap: clamp(24px, 4vw, 52px);
}
.hero-copy { max-width: 580px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 15px; border-radius: 999px;
  background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .38);
  font-size: 13px; font-weight: 700; backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.badge-live .dot { width: 8px; height: 8px; border-radius: 50%; background: #7dffd4; animation: pulse 1.9s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(125, 255, 212, .6); } 70% { box-shadow: 0 0 0 11px rgba(125, 255, 212, 0); } 100% { box-shadow: 0 0 0 0 rgba(125, 255, 212, 0); } }

.hero-title { font-size: clamp(38px, 7.2vw, 62px); margin: 20px 0 4px; letter-spacing: -.04em; text-shadow: 0 8px 26px rgba(0, 0, 0, .18); }
.hero-title .grad { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: clamp(17px, 2.5vw, 23px); font-weight: 800; margin: 0 0 14px; opacity: .97; letter-spacing: -.01em; }
.hero-desc { font-size: clamp(14.5px, 1.6vw, 16.5px); line-height: 1.85; opacity: .93; max-width: 520px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0 20px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 10px 20px; font-size: 13.5px; font-weight: 700; opacity: .96; }
.hero-trust li { display: inline-flex; align-items: center; gap: 6px; }

/* Hero 客服条 */
.hero-service {
  margin-top: 26px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 14px 18px; border-radius: 18px;
  background: rgba(255, 255, 255, .15); border: 1px solid rgba(255, 255, 255, .4);
  box-shadow: 0 12px 34px rgba(0, 0, 0, .16); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.hs-label { font-size: 13.5px; font-weight: 800; line-height: 1.4; }
.hs-label small { font-size: 12px; font-weight: 600; opacity: .92; }
.hs-ids { display: flex; gap: 10px; flex-wrap: wrap; }
.hs-chip {
  display: flex; flex-direction: column; align-items: flex-start; gap: 1px; cursor: pointer;
  padding: 8px 16px; border: 0; border-radius: 13px; background: #fff; color: var(--red-deep);
  box-shadow: 0 6px 18px rgba(0, 0, 0, .16); transition: transform .18s var(--ease), box-shadow .18s, background .25s, color .25s;
}
.hs-chip b { font-size: 16.5px; font-weight: 900; letter-spacing: .01em; line-height: 1.2; }
.hs-chip small { font-size: 11px; font-weight: 700; opacity: .72; }
.hs-chip.main { background: linear-gradient(135deg, #fff, #fff3e0); box-shadow: 0 6px 18px rgba(0, 0, 0, .2), inset 0 0 0 1.5px rgba(255, 157, 47, .6); }
.hs-chip:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(0, 0, 0, .24); }
.hs-chip.copied { background: linear-gradient(135deg, #16b98a, #0f9d76); color: #fff; }
.hs-chip.copied small { opacity: .9; }

/* Hero 手机模型 */
.hero-visual { position: relative; height: 580px; display: flex; align-items: center; justify-content: center; }
.phone {
  position: absolute; width: 292px; padding: 11px; border-radius: 42px;
  background: linear-gradient(160deg, #2b2f38, #0d0f13);
  box-shadow: var(--shadow-lg), 0 0 0 1.5px rgba(255, 255, 255, .12) inset;
}
.phone::before {
  content: ""; position: absolute; top: 18px; left: 50%; transform: translateX(-50%);
  width: 78px; height: 20px; border-radius: 999px; background: #0d0f13; z-index: 2;
}
.phone-screen { border-radius: 32px; overflow: hidden; background: #fff; aspect-ratio: 700 / 1413; }
.phone-screen img { width: 100%; height: 100%; object-fit: cover; object-position: top center; }
.phone-back { transform: translate(-96px, 10px) rotate(-7deg) scale(.9); z-index: 1; opacity: .97; }
.phone-front { transform: translate(74px, -6px) rotate(5deg); z-index: 2; }

.float-chip {
  position: absolute; z-index: 3; padding: 10px 15px; border-radius: 14px;
  background: rgba(255, 255, 255, .96); color: var(--ink);
  font-size: 13px; font-weight: 800; box-shadow: var(--shadow-md);
  animation: float 5s ease-in-out infinite; backdrop-filter: blur(4px);
}
.chip-1 { top: 7%; left: -1%; animation-delay: 0s; }
.chip-2 { top: 45%; right: -3%; animation-delay: 1.3s; }
.chip-3 { bottom: 7%; left: 3%; animation-delay: 2.4s; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-13px); } }

/* 联赛滚动条 */
.marquee {
  position: relative; z-index: 1; margin-top: clamp(34px, 5vw, 58px);
  padding: 13px 0; overflow: hidden;
  background: rgba(0, 0, 0, .16); border-top: 1px solid rgba(255, 255, 255, .18); border-bottom: 1px solid rgba(255, 255, 255, .18);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
          mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee-track { display: flex; gap: 14px; width: max-content; animation: slide 34s linear infinite; }
.marquee-track span { font-size: 14px; font-weight: 800; letter-spacing: .04em; white-space: nowrap; opacity: .95; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes slide { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- 6. 数据条 ---------- */
.stats { background: #fff; padding: clamp(30px, 4vw, 46px) 0; border-bottom: 1px solid var(--line); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { text-align: center; padding: 6px 4px; }
.stat .num {
  display: block; font-family: var(--font-num); font-size: clamp(30px, 4.4vw, 46px); font-weight: 900;
  line-height: 1.05; letter-spacing: -.02em;
  background: var(--grad-btn); -webkit-background-clip: text; background-clip: text; color: transparent;
  font-variant-numeric: tabular-nums;
}
.stat span { display: block; margin-top: 6px; font-size: 14px; font-weight: 600; color: var(--muted); }

/* ---------- 7. 通用 Section ---------- */
.section { padding: clamp(56px, 8vw, 92px) 0; }
.section:nth-of-type(even) { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 700px; margin: 0 auto clamp(32px, 5vw, 54px); }
.eyebrow {
  display: inline-block; font-size: 12px; font-weight: 900; letter-spacing: .18em; text-transform: uppercase;
  color: var(--red-deep); margin-bottom: 12px; padding: 5px 12px; border-radius: 999px;
  background: #fff1ee; border: 1px solid #ffddd7;
}
.section-head h2 { font-size: clamp(25px, 4.2vw, 38px); }
.section-head p { color: var(--muted); font-size: clamp(15px, 1.8vw, 17px); margin: 0; }

/* ---------- 8. 核心亮点 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 26px; box-shadow: var(--shadow-xs); overflow: hidden;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s;
}
.feature-card::before {
  content: ""; position: absolute; inset: 0 0 auto; height: 3px;
  background: linear-gradient(90deg, var(--c, var(--red)), transparent 70%); opacity: 0; transition: opacity .28s;
}
.feature-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); border-color: #ffe4de; }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 58px; height: 58px; border-radius: 17px; display: grid; place-items: center; font-size: 27px;
  margin-bottom: 16px; background: color-mix(in srgb, var(--c, var(--red)) 13%, #fff);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--c, var(--red)) 26%, #fff);
}
.feature-card h3 { font-size: 19px; }
.feature-card p { color: var(--ink-soft); font-size: 15px; line-height: 1.78; margin: 0; }

/* ---------- 9. 界面预览 ---------- */
.shot-rail {
  display: grid; grid-auto-flow: column; grid-auto-columns: minmax(240px, 1fr); gap: 26px;
  overflow-x: auto; overscroll-behavior-x: contain; scroll-snap-type: x mandatory;
  padding: 6px 4px 18px; scrollbar-width: none; -ms-overflow-style: none; cursor: grab;
}
.shot-rail::-webkit-scrollbar { display: none; }
.shot-rail.dragging { cursor: grabbing; scroll-snap-type: none; }
.shot { margin: 0; scroll-snap-align: center; }
.shot-frame {
  position: relative; border-radius: 30px; overflow: hidden; padding: 9px;
  background: linear-gradient(160deg, #2b2f38, #0d0f13); box-shadow: var(--shadow-lg);
  transition: transform .32s var(--ease), box-shadow .32s var(--ease);
}
.shot-frame img { border-radius: 22px; width: 100%; height: auto; aspect-ratio: 700 / 1413; object-fit: cover; object-position: top; }
.shot:hover .shot-frame { transform: translateY(-10px) scale(1.015); box-shadow: 0 34px 70px rgba(23, 24, 28, .24); }
.shot figcaption { margin-top: 18px; text-align: center; }
.shot figcaption b { display: block; font-size: 16.5px; margin-bottom: 4px; }
.shot figcaption span { display: block; font-size: 14px; color: var(--muted); line-height: 1.65; }

.rail-dots { display: none; justify-content: center; gap: 4px; margin-top: 4px; }
.rail-dots button { position: relative; width: 8px; height: 8px; padding: 0; border: 0; border-radius: 999px; background: #e5d3ce; cursor: pointer; transition: all .25s var(--ease); }
/* 扩大点击热区而不改变视觉尺寸 */
.rail-dots button::before { content: ""; position: absolute; inset: -18px -12px; }
.rail-dots button.on { width: 26px; background: var(--grad-btn); }

/* ---------- 10. 下载 ---------- */
.download { background: var(--bg-warm) !important; }
.device-hint { text-align: center; margin: -18px 0 26px; font-size: 14px; font-weight: 700; color: var(--red-deep); }
.device-hint:empty { display: none; }
.download-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 900px; margin-inline: auto; }
.device-card {
  position: relative; background: #fff; border: 1.5px solid transparent; border-radius: var(--radius-lg);
  padding: 32px 28px 28px; box-shadow: var(--shadow-sm); background-clip: padding-box;
  transition: transform .26s var(--ease), box-shadow .26s var(--ease), border-color .26s;
}
.device-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.device-card.hot { border-color: var(--red); box-shadow: var(--shadow-red); }
.device-card.hot::after {
  content: "推荐 · 已识别为你的设备"; position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  padding: 5px 14px; border-radius: 999px; background: var(--grad-btn); color: #fff;
  font-size: 12.5px; font-weight: 800; white-space: nowrap; box-shadow: var(--shadow-red);
}
.device-icon { font-size: 40px; line-height: 1; margin-bottom: 12px; }
.device-card h3 { font-size: 21px; display: flex; align-items: center; gap: 10px; }
.os-tag { font-size: 11.5px; font-weight: 800; letter-spacing: .08em; color: var(--red-deep); background: #fff1ee; border: 1px solid #ffddd7; padding: 3px 9px; border-radius: 999px; }
.device-card p { color: var(--ink-soft); font-size: 15px; min-height: 62px; }
.meta {
  display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 16px 0 20px; padding: 15px 0;
  border-top: 1px dashed var(--line); border-bottom: 1px dashed var(--line);
}
.meta li { font-size: 13.5px; color: var(--muted); }
.meta strong { color: var(--ink); font-weight: 800; }
.safety-tip { text-align: center; margin: 28px auto 0; color: var(--ink-soft); font-size: 14px; max-width: 640px; }
.safety-tip strong { color: var(--red-deep); }

/* 下载区客服横幅 */
.download-service {
  margin: 24px auto 0; max-width: 900px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  padding: 22px 26px; border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #fff, #fff8f5); border: 1px solid #ffdfda; box-shadow: var(--shadow-md);
}
.ds-icon { font-size: 34px; line-height: 1; }
.ds-text { display: flex; flex-direction: column; margin-right: auto; min-width: 230px; }
.ds-text strong { font-size: 16.5px; }
.ds-text span { font-size: 13px; color: var(--muted); margin-top: 3px; }
.ds-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-service { background: #fff; color: var(--red-deep); border: 1.5px solid #ffd0cb; font-size: 16px; letter-spacing: .01em; box-shadow: var(--shadow-xs); }
.btn-service:hover { transform: translateY(-2px); box-shadow: var(--shadow-red); border-color: transparent; color: #fff; background: var(--grad-btn); }
.btn-service.copied { background: linear-gradient(135deg, #16b98a, #0f9d76); color: #fff; border-color: transparent; box-shadow: 0 14px 34px rgba(22, 185, 138, .38); }

/* ---------- 11. 安装教程 ---------- */
.tabs { max-width: 880px; margin-inline: auto; }
.tab-buttons { display: flex; gap: 10px; justify-content: center; margin-bottom: 28px; flex-wrap: wrap; }
.tab-btn {
  padding: 13px 26px; border-radius: 999px; border: 1.5px solid var(--line); background: #fff;
  color: var(--ink-soft); font-size: 15px; font-weight: 700; cursor: pointer;
  transition: all .22s var(--ease); min-height: 46px;
}
.tab-btn:hover { border-color: #f3cfc9; color: var(--red-deep); }
.tab-btn.active { background: var(--grad-btn); color: #fff; border-color: transparent; box-shadow: var(--shadow-red); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeUp .4s var(--ease); }
.steps { display: grid; gap: 14px; }
.steps li {
  display: grid; grid-template-columns: 48px 1fr; gap: 18px; align-items: start;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px; box-shadow: var(--shadow-xs);
}
.step-no {
  width: 48px; height: 48px; border-radius: 15px; display: grid; place-items: center;
  background: var(--grad-flame); color: #fff; font-weight: 900; font-size: 20px; font-family: var(--font-num);
}
.steps h3 { font-size: 17px; margin-bottom: 4px; }
.steps p { margin: 0; color: var(--ink-soft); font-size: 15px; }

/* ---------- 12. 联系客服 ---------- */
.support { background: linear-gradient(150deg, #fff4f1 0%, #fdeee6 60%, #fff7f0 100%) !important; }
.support-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; max-width: 820px; margin-inline: auto; }
.service-card {
  position: relative; display: flex; flex-direction: column; align-items: flex-start; gap: 14px;
  background: #fff; border-radius: var(--radius-lg); padding: 26px 26px 24px;
  box-shadow: var(--shadow-md); border: 1.5px solid #fff; transition: transform .26s var(--ease), box-shadow .26s;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.service-card.recommended { border-color: #ffd9a8; box-shadow: var(--shadow-md), 0 0 0 3px rgba(255, 179, 0, .12); }
.sc-flag {
  position: absolute; top: -12px; right: 22px; padding: 4px 12px; border-radius: 999px;
  background: linear-gradient(135deg, #ffb300, #ff7a18); color: #fff; font-size: 12px; font-weight: 900;
  box-shadow: 0 8px 18px rgba(255, 122, 24, .4);
}
.service-avatar {
  width: 58px; height: 58px; border-radius: 17px; display: grid; place-items: center; flex: none;
  color: #fff; font-size: 24px; font-weight: 900; background: var(--grad-btn); box-shadow: var(--shadow-red);
}
.service-avatar.alt { background: linear-gradient(135deg, #3a3f4b, #17181c); box-shadow: var(--shadow-md); }
.service-info { display: flex; flex-direction: column; min-width: 0; }
.service-label { font-size: 13px; color: var(--muted); font-weight: 700; }
.service-id { font-size: clamp(24px, 4vw, 30px); font-weight: 900; letter-spacing: .01em; line-height: 1.3; word-break: break-all; font-family: var(--font-num); }
.service-hours { font-size: 12.5px; color: var(--red-deep); font-weight: 700; }
.service-card .btn { width: 100%; }
.btn-copy.copied { background: linear-gradient(135deg, #16b98a, #0f9d76); color: #fff; border-color: transparent; box-shadow: 0 14px 34px rgba(22, 185, 138, .4); }
.support-note { text-align: center; margin: 30px auto 0; color: var(--ink-soft); font-size: 14px; max-width: 620px; line-height: 1.9; }
.support-note strong { color: var(--red-deep); }

/* ---------- 13. FAQ ---------- */
.faq-list { display: grid; gap: 12px; }
.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0 22px; box-shadow: var(--shadow-xs); overflow: hidden;
  transition: border-color .22s, box-shadow .22s;
}
.faq-item[open] { border-color: #ffd9d6; box-shadow: var(--shadow-sm); }
.faq-item summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 19px 0; font-weight: 700; font-size: 16px; line-height: 1.6;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--red-deep); }
.faq-ico { position: relative; flex: none; width: 24px; height: 24px; border-radius: 50%; background: #fff1ee; }
.faq-ico::before, .faq-ico::after {
  content: ""; position: absolute; background: var(--red); border-radius: 2px; top: 50%; left: 50%;
  transform: translate(-50%, -50%); transition: transform .25s var(--ease), opacity .25s;
}
.faq-ico::before { width: 11px; height: 2.4px; }
.faq-ico::after { width: 2.4px; height: 11px; }
.faq-item[open] .faq-ico { background: var(--grad-btn); }
.faq-item[open] .faq-ico::before, .faq-item[open] .faq-ico::after { background: #fff; }
.faq-item[open] .faq-ico::after { transform: translate(-50%, -50%) rotate(90deg); opacity: 0; }
.faq-body { padding: 0 0 20px; color: var(--ink-soft); font-size: 15px; }
.faq-body p { margin: 0; line-height: 1.85; }
.faq-body strong { color: var(--red-deep); }

.notice {
  margin-top: 32px; padding: 22px 24px; border-radius: var(--radius);
  background: #fff8ee; border: 1px solid #ffe6bf; color: #8a6a2f;
}
.notice h3 { margin-bottom: 8px; color: #b9791f; font-size: 16px; }
.notice p { margin: 0; font-size: 14px; line-height: 1.85; }

/* ---------- 14. 页脚 ---------- */
.site-footer { background: #14151a; color: #c2c8d4; padding-top: 58px; }
.footer-grid { display: grid; grid-template-columns: 1.7fr 1fr 1.25fr; gap: 40px; padding-bottom: 40px; }
.footer-brand .brand-text { color: #fff; }
.footer-brand .brand-text em { color: #ff6a4d; }
.footer-brand p { margin-top: 16px; font-size: 14px; color: #9aa4b2; max-width: 330px; }
.site-footer h3 { color: #fff; font-size: 15px; margin: 0 0 14px; letter-spacing: .04em; }
.footer-links { display: flex; flex-direction: column; gap: 4px; }
.footer-links a { font-size: 14px; color: #9aa4b2; transition: color .2s, transform .2s; width: fit-content; padding: 6px 0; }
.footer-links a:hover { color: #ff8a6a; transform: translateX(3px); }
.footer-contact p { font-size: 14px; color: #9aa4b2; margin-bottom: 9px; }
.footer-contact strong { color: #fff; font-family: var(--font-num); letter-spacing: .02em; }
.footer-contact .btn { margin-top: 10px; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .08); padding: 22px 0 calc(22px + env(safe-area-inset-bottom)); text-align: center; }
.footer-bottom p { margin: 0; font-size: 13px; color: #7f8a99; }
.footer-disclaimer { margin-top: 7px !important; color: #8b93a1 !important; line-height: 1.7; }
.footer-updated { margin-top: 7px !important; color: #8b93a1 !important; }

/* ---------- 15. 悬浮元素 ---------- */
.mobile-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 92; display: none;
  padding: 9px 14px calc(9px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, .94); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--line); box-shadow: 0 -6px 24px rgba(23, 24, 28, .08);
  transform: translateY(130%); transition: transform .38s var(--ease);
}
.mobile-bar.show { transform: translateY(0); }
.mobile-bar-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.mobile-bar-info { display: flex; align-items: center; gap: 10px; min-width: 0; }
.mobile-bar-info img { border-radius: 9px; flex: none; }
.mobile-bar-info div { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.mobile-bar-info strong { font-size: 15px; }
.mobile-bar-info span { font-size: 12px; color: var(--muted); }

.back-top {
  position: fixed; right: 22px; bottom: 96px; z-index: 80;
  width: 46px; height: 46px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--ink); color: #fff; font-size: 20px; font-weight: 700;
  box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all .3s var(--ease);
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--grad-btn); transform: translateY(-3px); }

.float-service {
  position: fixed; right: 22px; bottom: 26px; z-index: 88;
  display: flex; flex-direction: column; align-items: flex-end; gap: 12px; pointer-events: none;
}
.fs-toggle {
  position: relative; width: 58px; height: 58px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--grad-btn); color: #fff; display: grid; place-items: center;
  box-shadow: var(--shadow-red-lg); transition: transform .22s var(--ease); pointer-events: auto;
}
.fs-toggle:hover { transform: scale(1.08) rotate(-4deg); }
.fs-dot {
  position: absolute; top: 1px; right: 1px; width: 15px; height: 15px; border-radius: 50%;
  background: #22c55e; border: 2px solid #fff; animation: pulse 1.9s infinite;
}
.fs-panel {
  width: 236px; padding: 16px; border-radius: 20px; background: #fff; pointer-events: auto;
  box-shadow: var(--shadow-lg); border: 1px solid var(--line);
  opacity: 0; visibility: hidden; transform: translateY(10px) scale(.96); transform-origin: bottom right;
  transition: opacity .25s, transform .25s var(--ease), visibility .25s;
}
.float-service.open .fs-panel { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
.fs-title { font-size: 13px; font-weight: 800; color: var(--ink-soft); margin: 0 0 12px; }
.fs-item {
  display: flex; align-items: baseline; justify-content: space-between; gap: 8px; width: 100%;
  margin-bottom: 10px; cursor: pointer; padding: 11px 14px; border-radius: 13px;
  border: 1.5px solid #ffd8d2; background: #fff6f4; color: var(--red-deep);
  transition: all .2s var(--ease);
}
.fs-item b { font-size: 17.5px; font-weight: 900; font-family: var(--font-num); }
.fs-item small { font-size: 11px; font-weight: 800; opacity: .75; }
.fs-item.main { box-shadow: inset 0 0 0 1.5px rgba(255, 157, 47, .5); }
.fs-item:last-of-type { margin-bottom: 0; }
.fs-item:hover { background: var(--grad-btn); color: #fff; border-color: transparent; transform: translateY(-2px); }
.fs-item:hover small { opacity: .92; }
.fs-item.copied { background: linear-gradient(135deg, #16b98a, #0f9d76); color: #fff; border-color: transparent; }
.fs-dl {
  display: block; margin-top: 12px; padding: 11px; border-radius: 13px; text-align: center;
  background: var(--ink); color: #fff; font-size: 14px; font-weight: 800; transition: background .2s;
}
.fs-dl:hover { background: #000; }

.toast {
  position: fixed; left: 50%; bottom: 96px; z-index: 300; transform: translate(-50%, 20px);
  width: max-content; background: rgba(20, 21, 26, .95); color: #fff; padding: 13px 22px; border-radius: 999px;
  font-size: 14px; font-weight: 600; box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transition: all .3s var(--ease); pointer-events: none;
  max-width: calc(100vw - 32px); text-align: center;
}
.toast.show { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

/* ---------- 16. 滚动动画 ---------- */
[data-animate] { opacity: 0; transform: translateY(28px); transition: opacity .65s var(--ease), transform .65s var(--ease); }
[data-animate].in { opacity: 1; transform: none; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
/* 无 JS 环境兵底：直接显示全部内容 */
.no-js [data-animate] { opacity: 1; transform: none; }

/* =========================================================
   17. 响应式 —— 平板
   ========================================================= */
@media (max-width: 1080px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; gap: 8px; }
  .hero-copy { max-width: 660px; margin-inline: auto; text-align: center; }
  .hero-actions, .hero-trust, .hero-service { justify-content: center; }
  .hero-desc { margin-inline: auto; }
  .hs-chip { align-items: center; }
  .hero-visual { height: 520px; margin-top: 14px; }
  .main-nav a { padding: 9px 10px; font-size: 14.5px; }
}

@media (max-width: 900px) {
  .main-nav { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* =========================================================
   18. 响应式 —— 手机
   ========================================================= */
@media (max-width: 720px) {
  :root { --header-h: 60px; }
  body { padding-bottom: 72px; }

  /* 导航 */
  .nav-cta { display: none; }
  .brand-text { font-size: 18px; }
  .nav-toggle {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 44px; height: 44px; margin-left: auto; padding: 0 10px; background: transparent; border: 0; cursor: pointer;
  }
  .nav-toggle span { width: 100%; height: 2.5px; background: var(--ink); border-radius: 2px; transition: transform .3s var(--ease), opacity .3s; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

  .main-nav {
    position: fixed; inset: var(--header-h) 0 auto 0; display: flex; flex-direction: column; gap: 0;
    background: #fff; padding: 10px clamp(16px, 4vw, 24px) 22px; margin: 0; z-index: 99;
    box-shadow: var(--shadow-md); border-bottom: 1px solid var(--line);
    transform: translateY(-130%); transition: transform .34s var(--ease);
  }
  .main-nav.open { display: flex; transform: translateY(0); }
  .main-nav a { padding: 15px 8px; font-size: 16.5px; border-bottom: 1px solid #f7f2f0; }
  .main-nav a:last-child { border-bottom: 0; }
  .main-nav a::after { display: none; }

  /* Hero */
  .hero { padding-bottom: 56px; }
  .hero-title { font-size: clamp(34px, 10vw, 44px); margin-top: 16px; }
  .hero-actions { gap: 10px; }
  .hero-actions .btn { flex: 1 1 100%; }
  .hero-trust { gap: 8px 14px; font-size: 13px; }
  .hero-service { width: 100%; flex-direction: column; text-align: center; gap: 12px; padding: 16px 14px; }
  .hs-ids { width: 100%; justify-content: center; }
  .hs-chip { flex: 1 1 44%; min-width: 140px; }
  .hero-visual { height: 440px; }
  .phone { width: 224px; padding: 8px; border-radius: 34px; }
  .phone::before { width: 62px; height: 16px; top: 14px; }
  .phone-screen { border-radius: 26px; }
  .phone-front { transform: translate(52px, 0) rotate(5deg); }
  .phone-back { transform: translate(-76px, 6px) rotate(-7deg) scale(.9); }
  .float-chip { font-size: 11px; padding: 8px 11px; border-radius: 11px; }
  .chip-1 { left: 2%; top: 5%; } .chip-2 { right: 1%; } .chip-3 { left: 6%; bottom: 4%; }
  .marquee { margin-top: 30px; padding: 10px 0; }
  .marquee-track span { font-size: 13px; }

  /* 数据条 */
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px 10px; }

  /* 预览：改为滑动轨道（避开 100vw 含滚动条导致的横向溢出） */
  .shot-rail { grid-auto-columns: 76%; gap: 16px; margin-inline: calc(-1 * clamp(16px, 4vw, 24px)); padding-inline: clamp(16px, 4vw, 24px); }
  .rail-dots { display: flex; }

  /* 网格单列 */
  .feature-grid { grid-template-columns: 1fr; gap: 14px; }
  .feature-card { padding: 24px 20px; }
  .download-grid { grid-template-columns: 1fr; gap: 18px; }
  .device-card { padding: 26px 22px; }
  .device-card p { min-height: auto; }
  .device-card.hot::after { font-size: 11.5px; padding: 4px 11px; }
  .support-grid { grid-template-columns: 1fr; gap: 18px; }
  .steps li { grid-template-columns: 40px 1fr; gap: 14px; padding: 18px 18px; }
  .step-no { width: 40px; height: 40px; border-radius: 12px; font-size: 17px; }
  .tab-btn { flex: 1 1 46%; padding: 12px 14px; }

  /* 客服横幅 */
  .download-service { flex-direction: column; align-items: stretch; text-align: center; gap: 14px; padding: 20px 18px; }
  .ds-text { margin-right: 0; align-items: center; }
  .ds-btns { justify-content: center; }
  .ds-btns .btn { flex: 1 1 44%; min-width: 148px; }

  /* 页脚 */
  .footer-grid { grid-template-columns: 1fr; gap: 26px; padding-bottom: 32px; }
  .site-footer { padding-top: 40px; }

  /* 悬浮元素 */
  .mobile-bar { display: block; }
  .back-top { display: none; }
  .float-service { right: 14px; bottom: 84px; }
  .fs-toggle { width: 52px; height: 52px; }
  .fs-panel { width: 210px; }
  .toast { bottom: 150px; }
}

@media (max-width: 420px) {
  .hero-title { font-size: 31px; }
  .hero-visual { height: 388px; }
  .phone { width: 190px; }
  .phone-front { transform: translate(42px, 0) rotate(5deg); }
  .phone-back { transform: translate(-62px, 6px) rotate(-7deg) scale(.9); }
  .service-id { font-size: 24px; }
  .shot-rail { grid-auto-columns: 84%; }
  .hs-chip { flex: 1 1 100%; }
}

/* 横屏矮屏手机 */
@media (max-height: 560px) and (orientation: landscape) {
  .hero-visual { display: none; }
  .mobile-bar { display: none; }
  body { padding-bottom: 0; }
}

/* =========================================================
   19. 触控与无障碍
   ========================================================= */
@media (hover: none) {
  .feature-card:hover, .device-card:hover, .service-card:hover, .shot:hover .shot-frame,
  .btn:hover, .hs-chip:hover, .fs-item:hover, .btn-service:hover, .fs-toggle:hover { transform: none; }
  .main-nav a:hover { background: transparent; }
  .marquee-track { animation-duration: 26s; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
  [data-animate] { opacity: 1; transform: none; }
  .marquee-track { animation: none; }
}

@media print {
  .site-header, .mobile-bar, .float-service, .back-top, .marquee, .toast { display: none !important; }
  .hero { color: #000; background: none; }
}