:root {
  --bg: #0b1220;
  --bg-elev: #0f172a;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #60a5fa;
  --primary-contrast: #0b1220;
  --border: #1f2a44;
  --ring: #3b82f6;
  --header-h: 76px;
  --stat-gap: 16px;
  --stat-sm-h: 180px;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-elev: #f8fafc;
  --text: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --border: #e2e8f0;
  --ring: #3b82f6;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  padding-top: var(--header-h);
}

.container {
  width: min(1320px, 94%);
  margin-inline: auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: transparent;
  backdrop-filter: none;
  border-bottom: 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 0;
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; }
.brand .brand-mark { font-size: 20px; }
.brand .brand-text { font-weight: 700; letter-spacing: 0.2px; }

/* Glass rounded navigation container */
.nav-shell {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid color-mix(in oklab, var(--text) 14%, transparent);
  background: color-mix(in oklab, var(--bg) 55%, transparent);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.04), 0 8px 28px rgba(2, 6, 23, 0.068);
}
.nav { display: flex; align-items: center; gap: 22px; }
.nav a { color: var(--text); text-decoration: none; font-weight: 600; opacity: 0.95; }
.nav a:hover { opacity: 1; }
.theme-toggle {
  margin-left: 6px;
  padding: 8px 10px;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.theme-toggle:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }

.nav-shell .theme-toggle {
  background: transparent;
  border-color: color-mix(in oklab, var(--text) 14%, transparent);
}

.hero { text-align: center; padding: 72px 0 48px; }
.hero h1 { margin: 0 0 12px; font-size: clamp(28px, 5vw, 44px); letter-spacing: 0.2px; }
.hero .subtitle { margin: 0 auto 22px; color: var(--muted); max-width: 720px; }
.cta-row { display: inline-flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 16px; border-radius: 12px; text-decoration: none; font-weight: 600; border: 1px solid transparent; }
.btn-primary { background: var(--primary); color: var(--primary-contrast); }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border); }
.btn-text { background: transparent; color: var(--muted); }
.btn:hover { transform: translateY(-1px); transition: transform 160ms ease; }

.app-section { padding: 36px 0 28px; }
.app-head { display: grid; grid-template-columns: 1.1fr 1.2fr; gap: 28px; align-items: start; }
.app-meta h2 { margin: 6px 0 6px; font-size: clamp(22px, 4vw, 32px); }
.app-meta .tagline { margin: 0 0 12px; color: var(--muted); }
.feature-list { margin: 0 0 18px; padding-left: 18px; }
.feature-list li { margin: 8px 0; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }

.app-media { width: 100%; }
.media-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.shot { margin: 0; border: 1px solid var(--border); border-radius: 14px; overflow: hidden; background: var(--bg-elev); }
.shot img { width: 100%; height: auto; display: block; }

.cta-bottom { text-align: center; padding: 36px 0 64px; }
.cta-bottom h3 { margin: 0 0 8px; font-size: clamp(18px, 3.5vw, 24px); }
.cta-bottom .subtitle { color: var(--muted); margin: 0 0 12px; }

.site-footer { border-top: 1px solid var(--border); background: color-mix(in oklab, var(--bg) 92%, transparent); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
.footer-inner a { color: var(--muted); text-decoration: none; margin-left: 14px; }
.footer-inner a:hover { color: var(--text); }

/* ==== 首页展示区 ==== */
.home-showcase { padding: 24px 0 64px; }
.showcase-panel {
  position: relative;
  background: transparent;
  border: none;
  border-radius: 0;
  overflow: visible;
  min-height: 420px;
  box-shadow: none;
}
.grid-overlay {
  position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(transparent 98%, rgba(148,163,184,0.05) 98%);
  background-size: 24px 24px;
  opacity: 1;
}

.showcase-toolbar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
}
.tb-right { justify-self: end; display: flex; align-items: center; gap: 10px; }
.tb-left { display: flex; align-items: center; gap: 10px; }
.tb-center { display: none; }

.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 12px; border-radius: 999px; text-decoration: none;
  background: var(--bg);
  color: var(--text); border: 1px solid var(--border);
  font-weight: 600; font-size: 14px; opacity: 0.9;
}
.pill.active { background: var(--primary); color: var(--primary-contrast); border-color: transparent; }

.logo-pill, .icon-btn {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 18px;
}
.coins { padding: 8px 12px; border-radius: 12px; background: var(--bg); border: 1px solid var(--border); color: var(--text); }
.avatar { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: var(--primary); color: var(--primary-contrast); font-weight: 700; }

/* removed search block */
.search { display: none !important; }

.showcase-body { text-align: center; padding: 12px 16px 48px; }
.promo { display: inline-flex; align-items: center; gap: 8px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 999px; color: var(--muted); background: var(--bg); }
.promo .dot { width: 8px; height: 8px; border-radius: 50%; background: #fbbf24; box-shadow: 0 0 0 3px rgba(251,191,36,0.15); }
.showcase-body h1 { margin: 14px 0 6px; font-size: clamp(28px, 6vw, 56px); line-height: 1.2; }
.subtitle.large { color: var(--muted); font-size: 18px; margin-top: 6px; }

/* tighten top spacing */
.home-showcase { padding: 24px 0 64px; }
.showcase-panel { min-height: 420px; }
.showcase-body { padding: 12px 16px 48px; }

/* remove toolbar spacing */
.showcase-toolbar { display: none; }
.home-showcase { padding-top: 92px; }

/* increase vertical spacing in home showcase */
.showcase-toolbar { margin-bottom: 60px; }
.promo { margin-bottom: 16px; }
.showcase-body h1 { margin: 20px 0 12px; }
.subtitle.large { margin-top: 10px; margin-bottom: 68px; }
.card-deck { margin-top: 34px; margin-bottom: 56px; }

/* 3D Tilt effects for cards */
.card-deck { position: relative; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 28px; }
.app-card { position: relative; background: var(--bg); border: 1px solid var(--border); border-radius: 18px; overflow: hidden; padding: 0; aspect-ratio: 4 / 3; }
.card-top { position: absolute; top: 10px; left: 10px; right: 10px; display: flex; align-items: center; justify-content: space-between; margin: 0; z-index: 2; }
.label { font-weight: 700; background: rgba(0,0,0,0.35); color: #fff; padding: 6px 10px; border-radius: 999px; border: 1px solid rgba(255,255,255,0.2); }
.badge { font-size: 12px; color: #fff; background: rgba(0,0,0,0.35); padding: 6px 10px; border: 1px solid rgba(255,255,255,0.2); border-radius: 999px; }
.app-card img { width: 100%; height: 100%; object-fit: cover; border-radius: inherit; display: block; }

/* Base rotated layout preserved via CSS var */
.card-guiwu { --base: rotate(-6deg) translateY(14px); }
.card-youche { --base: rotate(0deg) translateY(0px); z-index: 2; }
.card-laicai { --base: rotate(6deg) translateY(14px); }

/* Interactive tilt rules */
.card-deck { perspective: 1200px; transform-style: preserve-3d; }
.app-card {
  --rx: 0deg;
  --ry: 0deg;
  --shine: 0;
  --mx: 50%;
  --my: 50%;
  transform: var(--base, translateZ(0)) rotateX(var(--rx)) rotateY(var(--ry));
  transform-origin: center bottom;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  will-change: transform;
}
.app-card.is-hover { box-shadow: 0 18px 60px rgba(2,6,23,0.45); border-color: color-mix(in oklab, var(--border) 70%, var(--primary) 30%); }
.app-card::after {
  content: "";
  position: absolute; inset: -1px; pointer-events: none; border-radius: inherit;
  background: radial-gradient(600px circle at var(--mx) var(--my), rgba(255,255,255,0.10), rgba(255,255,255,0) 40%);
  opacity: var(--shine);
  transition: opacity 160ms ease;
  mix-blend-mode: overlay;
}

/* 彩色光韵边缘（增强） */
.app-card::before {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 22px;
  pointer-events: none;
  z-index: 1;
  background: conic-gradient(from 0deg at 50% 50%, #7dd3fc, #34d399, #c084fc, #fb7185, #7dd3fc);
  padding: 3px;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  filter: blur(14px) brightness(1.6) saturate(160%);
  mix-blend-mode: screen;
  transition: opacity 220ms ease;
  transform: rotate(0deg);
  will-change: transform, opacity;
}
@keyframes glowRotate { to { transform: rotate(360deg); } }
/* 取消边缘旋转，仅保留发光 */
.app-card.is-hover::before { opacity: 1; animation: none; transform: none; }
.app-card::after { z-index: 2; }

/* 悬停外发光阴影（增强） */
.app-card.is-hover {
  box-shadow: 0 14px 44px rgba(2, 6, 23, 0.13),
              0 0 16px rgba(96,165,250,0.40),
              0 0 8px rgba(52,211,153,0.32);
}

/* BlurText styles */
.bt-group { line-height: 1.05; }
.blur-text { display: inline-block; white-space: pre-wrap; }
.blur-text .bt-chunk { display: inline-block; filter: blur(8px); opacity: 0; transform: translateY(16px); }
.blur-text .bt-chunk.in { filter: blur(0px); opacity: 1; transform: translateY(0); transition: filter 500ms ease, opacity 500ms ease, transform 500ms ease; }
.blur-text[data-direction="bottom"] .bt-chunk { transform: translateY(-16px); }
.blur-text[data-direction="left"] .bt-chunk { transform: translateX(16px); }
.blur-text[data-direction="right"] .bt-chunk { transform: translateX(-16px); }

@media (max-width: 960px) {
  .app-head { grid-template-columns: 1fr; }
  .card-deck { grid-template-columns: 1fr; }
  .app-card img { height: auto; }
  .card-guiwu, .card-youche, .card-laicai { transform: none; }
}
@media (max-width: 640px) {
  .header-inner { padding: 12px 0; }
  .media-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
} 

/* App detail media: vertical shots and bottom alignment */
.app-media { display: flex; flex-direction: column; }
.media-grid { align-items: end; }
.shot { aspect-ratio: 3 / 4; }
.shot img { height: 100%; object-fit: cover; }
@media (min-width: 961px) {
  .app-head { align-items: end; }
  .media-grid { margin-top: auto; }
} 

/* About + Contact combined section */
.about-contact .ac-wrap { display: grid; grid-template-columns: 1.2fr 1fr; gap: 24px; align-items: center; }
.about-contact .ac-text h3 { margin: 0 0 8px; font-size: clamp(20px, 3.5vw, 28px); }
.about-contact .ac-text .feature-list { margin-top: 8px; }
.about-contact .ac-text .subtitle { text-indent: 2em; }
.about-contact .ac-cards { position: relative; min-height: 380px; }

/* CardSwap styles (no React, for plain HTML) */
.card-swap-container {
  position: relative;
  right: auto;
  bottom: auto;
  margin-left: auto;
  transform: none;
  transform-origin: center;
  perspective: 900px;
  overflow: visible;
}
.card-swap-container .card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 480px;
  height: 360px;
  border-radius: 14px;
  border: 1px solid color-mix(in oklab, var(--text) 14%, transparent);
  background: color-mix(in oklab, var(--bg-elev) 88%, transparent);
  color: var(--text);
  padding: 16px;
  transform-style: preserve-3d;
  will-change: transform;
  backface-visibility: hidden;
}
@media (max-width: 960px) {
  .about-contact .ac-wrap { grid-template-columns: 1fr; }
  .about-contact .ac-cards { justify-content: center; }
  .card-swap-container { transform: scale(0.9); }
}
@media (max-width: 640px) {
  .card-swap-container { transform: scale(0.75); }
} 

/* About/Contact framed box */
.about-contact .ac-box {
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  background: color-mix(in oklab, var(--bg-elev) 80%, transparent);
  border-radius: 24px;
  padding: 22px 22px;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.03), 0 10px 34px rgba(2, 6, 23, 0);
  overflow: hidden;
}
.about-contact .ac-wrap { padding: 12px; }

/* constrain cards inside the box */
.about-contact .ac-cards { position: relative; min-height: 380px; display: flex; justify-content: flex-end; padding: 8px 0; }
.card-swap-container {
  position: relative;
  right: auto;
  bottom: auto;
  margin-left: auto;
  transform: none;
  transform-origin: center;
  perspective: 900px;
  overflow: visible;
}
@media (max-width: 960px) {
  .about-contact .ac-wrap { grid-template-columns: 1fr; }
  .about-contact .ac-cards { justify-content: center; }
  .card-swap-container { transform: scale(0.9); }
}
@media (max-width: 640px) {
  .card-swap-container { transform: scale(0.75); }
} 

/* Window-like cards */
.card-swap-container .card.window { background: linear-gradient(180deg, color-mix(in oklab, var(--bg-elev) 92%, transparent), color-mix(in oklab, var(--bg-elev) 80%, transparent)); border-radius: 18px; overflow: hidden; padding: 0; }
.card-swap-container .card.window .win-top { display: flex; align-items: center; gap: 8px; padding: 10px 12px; background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02)); border-bottom: 1px solid color-mix(in oklab, var(--text) 10%, transparent); }
.card-swap-container .card.window .win-dot { width: 8px; height: 8px; border-radius: 50%; background: #94a3b8; opacity: 0.9; }
.card-swap-container .card.window .win-title { margin-left: 6px; color: var(--muted); font-weight: 600; font-size: 13px; }
.card-swap-container .card.window .win-body { padding: 16px 18px; } 
.card-swap-container .card.window .win-body video { display: block; width: 100%; height: 100%; object-fit: cover; border-radius: 12px; border: 1px solid color-mix(in oklab, var(--text) 10%, transparent); }

/* Adjust CardSwap position within about/contact box */
.about-contact .ac-cards { padding-top: 24px; }
.card-swap-container { margin-right: 228px; margin-top: 120px; }
@media (max-width: 960px) {
  .card-swap-container { margin-right: 0; margin-top: 16px; }
} 

/* Align about/contact text to top */
.about-contact .ac-wrap { align-items: start; }

/* Xiaohongshu button */
.btn.btn-xhs { background: #ff2442; color: #fff; border-color: transparent; }
.btn.btn-xhs:hover { filter: brightness(1.05); } 

/* Stats section above about-contact (mosaic style) */
.stats-section { padding: 28px 0 12px; margin-bottom: 10px; }
.stats-box { position: relative; z-index: 2; isolation: isolate; }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); grid-auto-rows: 180px; gap: 16px; }
.stat-item { padding: 16px; border-radius: 18px; border: 1px solid color-mix(in oklab, var(--text) 10%, transparent); background: color-mix(in oklab, var(--bg) 88%, transparent); display: flex; flex-direction: column; justify-content: space-between; }
.stat-item.tile-image { padding: 0; border: 0; background: transparent; }
.stat-item.tile-image img { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: 18px; }
/* tile positions similar to reference */
.tile-a { grid-column: 1 / 2; grid-row: 1 / 2; }
.tile-b { grid-column: 2 / 3; grid-row: 1 / 2; }
.tile-c { grid-column: 3 / 4; grid-row: 1 / 3; }
.tile-d { grid-column: 1 / 2; grid-row: 2 / 3; }
.tile-e { grid-column: 2 / 3; grid-row: 2 / 3; }
.tile-f { grid-column: 1 / 4; grid-row: 3 / 4; min-height: 160px; }

.stat-value { font-size: clamp(20px, 3.5vw, 28px); font-weight: 800; }
.stat-label { color: var(--muted); font-weight: 600; }

/* Two-column stacked stats layout */
.stats-grid.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: var(--stat-gap); }
.stats-col { display: grid; grid-template-rows: auto auto; gap: var(--stat-gap); }
.stack-top { display: grid; grid-template-columns: 1fr 1fr; gap: var(--stat-gap); }
.stack-bottom { display: grid; grid-template-columns: 1fr; }
.stat-item.sm { min-height: var(--stat-sm-h); height: var(--stat-sm-h); }
.stat-item.lg { min-height: calc(var(--stat-sm-h) * 2 + var(--stat-gap)); height: calc(var(--stat-sm-h) * 2 + var(--stat-gap)); }
.stat-item.tile-image img { width: 100%; height: 100%; object-fit: cover; }

.stats-grid.two-col { grid-auto-rows: auto; align-items: stretch; }
.stat-item.sm, .stat-item.lg { height: auto; }

@media (max-width: 640px) {
  .stats-grid.two-col { grid-template-columns: 1fr; }
  .stats-col { gap: 12px; }
  .stack-top { grid-template-columns: 1fr; }
  .stats-col.right .stack-bottom { grid-template-columns: 1fr; }
  :root { --stat-sm-h: 140px; }
  .stat-item.sm, .stat-item.lg { min-height: auto; }
}

@media (max-width: 960px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 160px; }
  .tile-a { grid-column: auto; grid-row: auto; }
  .tile-b { grid-column: auto; grid-row: auto; }
  .tile-c { grid-column: 1 / -1; grid-row: auto / span 1; }
  .tile-d { grid-column: auto; grid-row: auto; }
  .tile-e { grid-column: auto; grid-row: auto; }
  .tile-f { grid-column: 1 / -1; }
} 

/* Right column bottom: two small tiles side-by-side */
.stats-col.right .stack-bottom { grid-template-columns: 1fr 1fr; gap: var(--stat-gap); }

@media (max-width: 960px) {
  .stats-col.right .stack-bottom { grid-template-columns: 1fr 1fr; }
} 

/* Right column top: large tile spans two small widths */
.stats-col.right .stack-top { display: grid; grid-template-columns: 1fr 1fr; gap: var(--stat-gap); }
.stats-col.right .stack-top .stat-item.lg { grid-column: 1 / -1; } 

.app-title { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.app-title h2 { margin: 0; }
.app-logo { width: 64px; height: 64px; border-radius: 16px; } 

.contact-info { display: grid; gap: 8px; margin: 12px 0 16px; }
.contact-row { display: grid; grid-template-columns: 64px 1fr; align-items: center; gap: 10px; }
.contact-label { color: var(--muted); font-weight: 600; }
.contact-value a, .contact-value { color: var(--text); text-decoration: none; }

.qr-card { display: grid; grid-template-columns: 140px 1fr; gap: 14px; align-items: center; padding: 12px; border: 1px solid var(--border); border-radius: 14px; background: var(--bg-elev); }
.qr-code { width: 126px; height: 126px; border-radius: 12px; background: url('assets/二维码.png') center/cover no-repeat, linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02)); border: 1px solid color-mix(in oklab, var(--text) 10%, transparent); }
.qr-title { font-weight: 700; }
.qr-sub { color: var(--muted); font-size: 14px; margin-top: 4px; } 

.qr-info { margin-top: 10px; display: grid; gap: 6px; }
.qr-info .row { display: grid; grid-template-columns: 56px 1fr; align-items: center; gap: 8px; }
.qr-info .label { color: var(--muted); font-weight: 600; }
.qr-info .value, .qr-info .value a { color: var(--text); text-decoration: none; }

.qr-actions { margin-bottom: 1px; }

.ac-eyebrow { color: var(--muted); font-weight: 700; letter-spacing: 0.6px; text-transform: uppercase; font-size: 12px; }
.ac-title { margin: 4px 0 8px; }

.contact-card { display: grid; grid-template-columns: 1.2fr 1fr; gap: 18px; padding: 16px; border: 1px solid var(--border); border-radius: 16px; background: color-mix(in oklab, var(--bg-elev) 85%, transparent); }
.contact-card .info { display: grid; gap: 10px; }
.contact-card .row { display: grid; grid-template-columns: 72px 1fr; align-items: center; gap: 10px; }
.contact-card .label { color: var(--muted); font-weight: 600; }
.contact-card .value { color: var(--text); text-decoration: none; }
.contact-card .hint { color: var(--muted); font-size: 13px; margin-top: 4px; }

.qr-block { display: grid; grid-template-columns: 140px 1fr; gap: 12px; align-items: center; }
.qr { width: 140px; height: 140px; border-radius: 12px; background: url('assets/qr.png') center/cover no-repeat, linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02)); border: 1px solid color-mix(in oklab, var(--text) 10%, transparent); }
.qr-meta .qr-title { font-weight: 700; }
.qr-meta .qr-sub { color: var(--muted); font-size: 14px; margin-top: 4px; }

.ac-actions { display: flex; gap: 10px; margin-top: 14px; }

@media (max-width: 960px) {
  .contact-card { grid-template-columns: 1fr; }
  .qr-block { grid-template-columns: 120px 1fr; }
} 

.media-wide { display: block; }
.shot.wide { aspect-ratio: 16 / 9 !important; }
.shot.wide img { width: 100%; height: 100%; object-fit: cover; } 

@media (max-width: 640px) {
  .about-contact .ac-box { overflow: visible; padding: 16px; }
  .about-contact .ac-wrap { text-align: left; }
  .about-contact .ac-text { text-align: left; }
  .about-contact .ac-cards { justify-content: center; }
  .card-swap-container { margin: 0 auto; }
  .contact-card { gap: 12px; padding: 12px; }
  .qr-block { grid-template-columns: 108px 1fr; gap: 10px; }
  .qr { width: 108px; height: 108px; }
  .qr-meta .qr-sub { font-size: 13px; }
  .qr-info .row { grid-template-columns: 52px 1fr; }
  .qr-info .value, .qr-info .value a { word-break: break-all; overflow-wrap: anywhere; }
} 

@media (max-width: 640px) {
  .qr-card { grid-template-columns: 1fr; }
  .qr-code { justify-self: center; margin-bottom: 8px; }
  .qr-text { display: grid; gap: 8px; }
  .qr-actions { display: flex; justify-content: center; }
  .qr-info .row { grid-template-columns: auto 1fr; gap: 8px; }
  .qr-info .label { font-size: 13px; opacity: 0.85; white-space: nowrap; }
  .qr-info { text-align: left; }
  .qr-info .row { justify-items: start; }
  .qr-info .value, .qr-info .value a { text-align: left; }
} 

/* 浮动操作按钮 */
.floating-actions {
  position: fixed;
  bottom: 24px;
  right: 52px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.floating-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(2, 6, 23, 0.15);
  transition: all 200ms ease;
  user-select: none;
  -webkit-user-select: none;
}

.floating-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(2, 6, 23, 0.25);
  border-color: var(--primary);
}

.floating-btn:active {
  transform: translateY(0);
}

.floating-btn.back-to-top {
  font-size: 20px;
  font-weight: 600;
}

@media (max-width: 640px) {
  .floating-actions {
    bottom: 20px;
    right: 16px;
    gap: 10px;
    align-items: center;
    justify-content: center;
  }
  
  .floating-btn {
    width: 44px;
    height: 44px;
    font-size: 16px;
    margin: 0 auto;
  }
  
  .floating-btn.back-to-top {
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  .floating-actions {
    bottom: 16px;
    right: 12px;
    gap: 8px;
    align-items: center;
    justify-content: center;
  }
  
  .floating-btn {
    width: 40px;
    height: 40px;
    font-size: 14px;
    margin: 0 auto;
  }
  
  .floating-btn.back-to-top {
    font-size: 16px;
  }
} 

@media (max-width: 768px) {
  .card-swap-container { display: none; }
  .about-contact .ac-cards { min-height: auto; }
  .about-contact .ac-wrap { gap: 16px; }
}