/* ==========================================================
   曦主题官网 · Typecho 式极简 + 液态玻璃
   ========================================================== */

:root {
  --bg: #edf4f2;
  --bg-2: #f7fbfa;
  --text: #17221f;
  --text-2: #4a5955;
  --text-3: #7d8b87;
  --brand: #2bb39a;
  --brand-2: #1f8f7c;
  --brand-soft: rgba(43, 179, 154, .12);
  --brand-line: rgba(43, 179, 154, .35);

  --glass: rgba(255, 255, 255, .56);
  --glass-strong: rgba(255, 255, 255, .78);
  --edge: rgba(255, 255, 255, .92);
  --stroke: rgba(15, 45, 40, .08);
  --stroke-2: rgba(15, 45, 40, .14);
  --shadow: 0 1px 2px rgba(10, 40, 34, .04), 0 20px 44px -24px rgba(10, 40, 34, .28);
  --shadow-lg: 0 2px 6px rgba(10, 40, 34, .05), 0 40px 90px -40px rgba(10, 40, 34, .35);

  --radius: 20px;
  --radius-sm: 12px;
  --blur: 22px;
  --container: 1160px;
  --header-h: 72px;

  --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei UI", sans-serif;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  color-scheme: light;
  scroll-padding-top: calc(var(--header-h) + 18px);
}

[data-theme="dark"] {
  --bg: #0f1614;
  --bg-2: #121c19;
  --text: #e9f1ee;
  --text-2: #b4c3be;
  --text-3: #84938e;
  --brand: #35c4a8;
  --brand-2: #5fe0c4;
  --brand-soft: rgba(53, 196, 168, .14);
  --brand-line: rgba(53, 196, 168, .38);

  --glass: rgba(26, 36, 33, .56);
  --glass-strong: rgba(26, 36, 33, .8);
  --edge: rgba(255, 255, 255, .16);
  --stroke: rgba(255, 255, 255, .09);
  --stroke-2: rgba(255, 255, 255, .16);
  --shadow: 0 1px 2px rgba(0, 0, 0, .28), 0 24px 60px -30px rgba(0, 0, 0, .8);
  --shadow-lg: 0 2px 8px rgba(0, 0, 0, .35), 0 48px 110px -48px rgba(0, 0, 0, .9);

  color-scheme: dark;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
::selection { background: var(--brand); color: #fff; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
  font-size: 14px;
  transition: top .2s;
}
.skip-link:focus { top: 12px; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 背景 ---------- */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(60vw 60vw at 86% -12%, color-mix(in srgb, var(--brand) 22%, transparent), transparent 68%),
    radial-gradient(48vw 48vw at -8% 22%, rgba(96, 200, 220, .26), transparent 68%),
    radial-gradient(52vw 40vw at 60% 108%, color-mix(in srgb, var(--brand) 16%, transparent), transparent 70%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
  transition: background-color .4s;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: .55;
  will-change: transform;
}
.orb-1 {
  width: 46vw; height: 46vw; top: -14vw; right: -6vw;
  background: radial-gradient(circle at 30% 30%, #63dcc4, transparent 70%);
  animation: drift 22s ease-in-out infinite alternate;
}
.orb-2 {
  width: 38vw; height: 38vw; top: 28vh; left: -12vw;
  background: radial-gradient(circle at 60% 40%, #8fd8ea, transparent 70%);
  animation: drift 26s ease-in-out infinite alternate-reverse;
}
.orb-3 {
  width: 40vw; height: 40vw; bottom: -16vw; left: 38vw;
  background: radial-gradient(circle at 50% 50%, #a8e6cf, transparent 70%);
  animation: drift 30s ease-in-out infinite alternate;
}
[data-theme="dark"] .orb { opacity: .32; }
.grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--text) 5%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--text) 5%, transparent) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 75%);
  opacity: .5;
}
[data-theme="dark"] .grid { opacity: .35; }

@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(2vw, 3vh, 0) scale(1.08); }
}

/* ---------- 玻璃 ---------- */
.glass {
  position: relative;
  background: var(--glass);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 0 var(--edge), var(--shadow);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass { background: var(--glass-strong); }
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  transition: padding .25s;
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--bg) 62%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid transparent;
  opacity: 0;
  transition: opacity .3s, border-color .3s;
  pointer-events: none;
}
.site-header.is-scrolled::before {
  opacity: 1;
  border-bottom-color: var(--stroke);
}
.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 17px;
  letter-spacing: .2px;
  white-space: nowrap;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 11px;
  background: linear-gradient(145deg, color-mix(in srgb, var(--brand) 80%, #fff), var(--brand));
  color: #fff;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.5), 0 6px 14px -6px var(--brand);
}
.brand-mark svg { width: 20px; height: 20px; }
.brand-text { display: inline-flex; align-items: baseline; gap: 8px; }
.brand-text small {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--text-3);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}
.nav a {
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 14px;
  color: var(--text-2);
  transition: background .15s, color .15s;
}
.nav a:hover { background: var(--brand-soft); color: var(--text); }

.header-actions { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.icon-btn:hover { background: var(--brand-soft); color: var(--text); }
.icon-btn svg { width: 19px; height: 19px; }
.theme-toggle .ico-moon { display: none; }
[data-theme="dark"] .theme-toggle .ico-sun { display: none; }
[data-theme="dark"] .theme-toggle .ico-moon { display: block; }
.nav-toggle { display: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--stroke-2);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-size: 14.5px;
  font-weight: 550;
  line-height: 1.3;
  cursor: pointer;
  transition: transform .12s, background .18s, border-color .18s, box-shadow .18s, color .18s;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(.99); }

.btn-primary {
  background: linear-gradient(145deg, color-mix(in srgb, var(--brand) 82%, #fff), var(--brand));
  border-color: color-mix(in srgb, var(--brand) 70%, #000);
  color: #fff;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.45), 0 10px 24px -12px color-mix(in srgb, var(--brand) 70%, transparent);
}
.btn-primary:hover {
  background: linear-gradient(145deg, color-mix(in srgb, var(--brand) 88%, #fff), color-mix(in srgb, var(--brand) 92%, #000));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.5), 0 16px 32px -14px color-mix(in srgb, var(--brand) 75%, transparent);
  color: #fff;
}
.btn-ghost {
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-color: var(--stroke);
}
.btn-ghost:hover { background: var(--glass-strong); border-color: var(--stroke-2); }
.btn-sm { padding: 8px 14px; font-size: 13.5px; border-radius: 10px; }
.btn-lg { padding: 14px 26px; font-size: 16px; border-radius: 14px; }
.btn-block { width: 100%; }

/* ---------- 通用段落 ---------- */
.section { padding: 104px 0; position: relative; }
.section-head { max-width: 680px; margin: 0 auto 48px; text-align: center; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 2.4px;
  text-transform: uppercase;
  color: var(--brand-2);
}
[data-theme="dark"] .eyebrow { color: var(--brand-2); }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.25; margin: 0; }
h2 { font-size: clamp(1.75rem, 3.3vw, 2.5rem); letter-spacing: -.6px; }
.section-sub { margin: 14px auto 0; color: var(--text-2); font-size: 16px; max-width: 620px; }
.section-sub a { color: var(--brand-2); text-decoration: underline; text-underline-offset: 3px; }
.text-gradient {
  background: linear-gradient(100deg, var(--brand), #4fc7e6 55%, var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 首屏 ---------- */
.hero { padding: 72px 0 24px; }
.hero-copy { max-width: 860px; text-align: center; }
.live-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 0 var(--brand-line);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--brand) 45%, transparent); }
  70% { box-shadow: 0 0 0 10px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
.hero h1 {
  margin: 10px 0 0;
  font-size: clamp(2.5rem, 6.4vw, 4.6rem);
  font-weight: 680;
  letter-spacing: -2px;
  line-height: 1.12;
}
.lede {
  max-width: 620px;
  margin: 22px auto 0;
  font-size: clamp(15.5px, 1.6vw, 18px);
  color: var(--text-2);
  line-height: 1.85;
}
.hero-cta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}
.hero-meta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--text-3);
}
.hero-meta li { display: inline-flex; align-items: center; gap: 8px; }
.hero-meta li::before {
  content: "";
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--brand);
  opacity: .8;
}

.hero-visual { position: relative; margin-top: 58px; max-width: 1040px; }
.shot {
  padding: 10px;
  border-radius: 24px;
  box-shadow: inset 0 1px 0 var(--edge), var(--shadow-lg);
  overflow: hidden;
}
.shot-bar {
  display: flex;
  gap: 6px;
  padding: 2px 4px 10px;
}
.shot-bar span {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--stroke-2);
}
.shot img {
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--stroke);
}
.float-chip {
  position: absolute;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .4px;
  color: var(--text-2);
  box-shadow: inset 0 1px 0 var(--edge), var(--shadow);
  animation: float 6s ease-in-out infinite;
}
.chip-a { top: 22px; left: -26px; animation-delay: -1s; }
.chip-b { bottom: 84px; right: -30px; animation-delay: -3s; }
.chip-c { top: -18px; right: 12%; animation-delay: -2s; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ---------- 数据 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding-top: 64px;
  padding-bottom: 8px;
}
.stat {
  text-align: center;
  padding: 20px 10px;
  border-radius: var(--radius-sm);
}
.stat + .stat { border-left: 1px solid var(--stroke); border-radius: 0; }
.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 680;
  letter-spacing: -1px;
  line-height: 1.1;
  background: linear-gradient(120deg, var(--text), color-mix(in srgb, var(--brand) 70%, var(--text)));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat span { font-size: 13px; color: var(--text-3); }

/* ---------- 功能 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature {
  padding: 28px 26px;
  transition: transform .22s, box-shadow .22s, border-color .22s;
}
.feature:hover {
  transform: translateY(-4px);
  border-color: var(--stroke-2);
  box-shadow: inset 0 1px 0 var(--edge), var(--shadow-lg);
}
.feature-icon {
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  margin-bottom: 18px;
  border-radius: 12px;
  background: var(--brand-soft);
  color: var(--brand-2);
}
.feature-icon svg { width: 22px; height: 22px; }
.feature h3 { font-size: 18px; margin-bottom: 8px; letter-spacing: -.2px; }
.feature p { margin: 0; font-size: 14.5px; line-height: 1.8; color: var(--text-2); }

/* ---------- 界面 ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  align-items: start;
}
.gallery-item {
  margin: 0;
  padding: 10px;
  overflow: hidden;
  transition: transform .22s, box-shadow .22s;
}
.gallery-item:nth-child(3) { grid-column: 1 / -1; }
.gallery-item:hover { transform: translateY(-4px); box-shadow: inset 0 1px 0 var(--edge), var(--shadow-lg); }
.gallery-item img {
  width: 100%;
  border-radius: 13px;
  border: 1px solid var(--stroke);
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: top;
}
.gallery-item:nth-child(3) img { aspect-ratio: 16 / 9; object-position: center; }
.gallery-item figcaption {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 8px 6px;
  font-size: 13px;
  color: var(--text-3);
}
.gallery-item figcaption b { font-size: 14.5px; font-weight: 600; color: var(--text); }

/* ---------- 步骤 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.step { padding: 26px; }
.step-num {
  display: block;
  margin-bottom: 40px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--brand-2);
}
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { margin: 0; font-size: 14.5px; color: var(--text-2); line-height: 1.8; }
.step code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--brand-soft);
  color: var(--brand-2);
  font-family: var(--mono);
  font-size: 12.5px;
}

/* ---------- 下载 ---------- */
.download-card {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 44px 48px;
  overflow: hidden;
}
.download-card::after {
  content: "";
  position: absolute;
  inset: auto -10% -60% auto;
  width: 420px; height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--brand-soft), transparent 66%);
  pointer-events: none;
}
.download-copy h2 { font-size: clamp(2rem, 3.6vw, 2.9rem); }
.download-note { margin: 10px 0 22px; color: var(--text-3); font-size: 14px; }
.req-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 380px;
}
.req-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--stroke);
  font-size: 14px;
}
.req-list span { color: var(--text-3); }
.req-list b { font-weight: 600; }
.download-actions { display: grid; gap: 10px; position: relative; z-index: 1; }
.hint { margin: 4px 0 0; font-size: 12.5px; color: var(--text-3); text-align: center; line-height: 1.7; }

/* ---------- 社区 ---------- */
.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.community-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px;
  transition: transform .22s, box-shadow .22s, border-color .22s;
}
.community-card:hover {
  transform: translateY(-4px);
  border-color: var(--stroke-2);
  box-shadow: inset 0 1px 0 var(--edge), var(--shadow-lg);
}
.community-icon {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  margin-bottom: 18px;
  border-radius: 13px;
  background: var(--brand-soft);
  color: var(--brand-2);
}
.community-icon svg { width: 23px; height: 23px; }
.community-card h3 { font-size: 18px; margin-bottom: 6px; }
.community-card p { margin: 0 0 18px; font-size: 14px; color: var(--text-2); }
.card-link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand-2);
}
.stars {
  position: absolute;
  top: 24px;
  right: 24px;
  font-size: 12px;
  color: var(--text-3);
}

/* ---------- 反馈 ---------- */
.feedback-wrap {
  display: grid;
  grid-template-columns: .95fr 1.05fr;
  gap: 48px;
  align-items: start;
}
.feedback-copy h2 { margin-bottom: 12px; }
.feedback-tips { margin: 26px 0 20px; padding: 20px 22px; border-radius: 16px; }
.feedback-tips p { margin: 0 0 8px; font-size: 14px; }
.feedback-tips ul { margin: 0; padding-left: 18px; font-size: 13.5px; color: var(--text-2); }
.feedback-tips li { margin: 4px 0; }
.feedback-alt { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.copy-tip { font-size: 12.5px; color: var(--brand-2); min-height: 1em; }

.feedback-form { padding: 30px; display: grid; gap: 16px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field { display: grid; gap: 6px; }
.field > span { font-size: 13px; font-weight: 600; color: var(--text-2); }
.field > span em { font-style: normal; font-weight: 400; color: var(--text-3); margin-left: 4px; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--stroke);
  border-bottom-color: var(--stroke-2);
  border-radius: 10px;
  background: var(--glass-strong);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:hover, .field select:hover, .field textarea:hover { background: var(--glass); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-soft);
}
.field input::placeholder, .field textarea::placeholder { color: var(--text-3); }
.form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 2px;
}
.form-note { margin: 0; font-size: 12.5px; color: var(--text-3); }
.form-note.is-error { color: #d13438; }
.form-note.is-ok { color: #0f9d58; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--stroke);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  padding-top: 56px;
  padding-bottom: 40px;
}
.footer-brand p { max-width: 340px; margin: 14px 0 0; font-size: 13.5px; color: var(--text-3); line-height: 1.8; }
.footer-col { display: flex; flex-direction: column; gap: 9px; }
.footer-col h4 {
  margin: 0 0 4px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--text-3);
}
.footer-col a { font-size: 14px; color: var(--text-2); transition: color .15s; }
.footer-col a:hover { color: var(--brand-2); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 18px;
  padding-bottom: 28px;
  border-top: 1px solid var(--stroke);
  font-size: 12.5px;
  color: var(--text-3);
}
.footer-bottom p { margin: 0; }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  padding: 0;
  border: 1px solid var(--stroke);
  border-radius: 12px;
  color: var(--text-2);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s, transform .2s, visibility .2s;
}
.to-top svg { width: 18px; height: 18px; }
.to-top.is-show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { color: var(--text); }

/* ---------- 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s cubic-bezier(.2, .8, .2, 1), transform .7s cubic-bezier(.2, .8, .2, 1);
  transition-delay: var(--d, 0s);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .feature-grid, .steps, .community-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .gallery-item:nth-child(3) { grid-column: 1 / -1; }
  .gallery-item:nth-child(3) img { aspect-ratio: 16 / 9; }
  .download-card { grid-template-columns: 1fr; padding: 36px; gap: 28px; }
  .download-actions { max-width: 420px; }
  .feedback-wrap { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-brand { grid-column: span 3; }
}

@media (max-width: 720px) {
  :root { --header-h: 62px; }
  .container { padding: 0 18px; }
  .section { padding: 72px 0; }
  .nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 12px;
    right: 12px;
    display: grid;
    gap: 2px;
    padding: 10px;
    border: 1px solid var(--stroke);
    border-radius: 16px;
    background: var(--glass-strong);
    -webkit-backdrop-filter: blur(22px) saturate(170%);
    backdrop-filter: blur(22px) saturate(170%);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .2s, transform .2s, visibility .2s;
  }
  .nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav a { padding: 11px 14px; }
  .nav-toggle { display: grid; }
  .hide-sm { display: none; }
  .header-actions .btn-primary { padding: 8px 12px; font-size: 13px; }

  .hero { padding-top: 40px; }
  .hero h1 { letter-spacing: -1.2px; }
  .hero-visual { margin-top: 40px; }
  .float-chip { display: none; }
  .shot { padding: 7px; border-radius: 18px; }

  .stats { grid-template-columns: repeat(2, 1fr); padding-top: 44px; gap: 0; }
  .stat { padding: 16px 8px; }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--stroke); }

  .feature-grid, .gallery, .steps, .community-grid { grid-template-columns: 1fr; }
  .gallery-item:nth-child(3) { grid-column: auto; }
  .gallery-item img, .gallery-item:nth-child(3) img { aspect-ratio: 16 / 10; }
  .feature, .step, .community-card { padding: 22px; }
  .download-card { padding: 26px; border-radius: 18px; }
  .feedback-form { padding: 22px; }
  .field-row { grid-template-columns: 1fr; }
  .form-foot { align-items: stretch; }
  .form-foot .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px; padding-top: 40px; }
  .footer-brand { grid-column: span 2; }
  .to-top { right: 14px; bottom: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orb, .float-chip, .live-dot { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}