/* ============================================
   密幕 Mìmù — 官方网站样式
   深色科技风 · 紫青渐变 · 玻璃拟态
   ============================================ */

:root {
  /* 背景层 */
  --bg: #08080f;
  --bg-2: #0c0c17;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-2: rgba(255, 255, 255, 0.055);
  --stroke: rgba(255, 255, 255, 0.09);
  --stroke-2: rgba(255, 255, 255, 0.16);

  /* 文字 */
  --text: #f2f2f7;
  --text-2: #a8a8bd;
  --text-3: #6e6e85;

  /* 主题色 */
  --violet: #8b5cf6;
  --violet-2: #a78bfa;
  --cyan: #22d3ee;
  --emerald: #34d399;
  --amber: #fbbf24;
  --blue: #60a5fa;
  --rose: #fb7185;
  --grad: linear-gradient(135deg, #a78bfa 0%, #8b5cf6 40%, #22d3ee 100%);

  /* 尺寸 */
  --radius: 18px;
  --radius-sm: 12px;
  --max: 1200px;
  --nav-h: 72px;

  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.28);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }

::selection { background: rgba(139, 92, 246, 0.4); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.35);
  border-radius: 10px;
  border: 2px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: rgba(139, 92, 246, 0.6); }

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

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

/* ============ 背景光效 ============ */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 15% -5%, rgba(139, 92, 246, 0.16), transparent 60%),
    radial-gradient(1000px 500px at 85% 8%, rgba(34, 211, 238, 0.12), transparent 60%),
    var(--bg);
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  animation: drift 22s ease-in-out infinite;
}
.orb-1 { width: 480px; height: 480px; background: rgba(139, 92, 246, 0.4); top: -120px; left: -80px; }
.orb-2 { width: 420px; height: 420px; background: rgba(34, 211, 238, 0.28); top: 30%; right: -120px; animation-delay: -7s; }
.orb-3 { width: 380px; height: 380px; background: rgba(167, 139, 250, 0.22); bottom: 5%; left: 25%; animation-delay: -14s; }

@keyframes drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, -40px) scale(1.12); }
  66% { transform: translate(-40px, 50px) scale(0.94); }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 100% 70% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 100% 70% at 50% 0%, #000 40%, transparent 100%);
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease),
    background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.btn-primary {
  background: var(--grad);
  color: #0a0a14;
  box-shadow: 0 8px 28px rgba(139, 92, 246, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(139, 92, 246, 0.5);
}

.btn-ghost {
  background: var(--surface);
  border-color: var(--stroke-2);
  color: var(--text);
  backdrop-filter: blur(12px);
}
.btn-ghost:hover {
  background: var(--surface-2);
  border-color: rgba(167, 139, 250, 0.5);
  transform: translateY(-2px);
}

.btn-sm { padding: 9px 20px; font-size: 14px; }
.btn-lg { padding: 16px 38px; font-size: 16.5px; }
.btn-block { width: 100%; }

/* ============ 导航 ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease),
    backdrop-filter 0.35s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(8, 8, 15, 0.78);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border-bottom-color: var(--stroke);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark { transition: transform 0.5s var(--ease); }
.brand:hover .brand-mark { transform: rotate(-8deg) scale(1.08); }
.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.brand-name i {
  font-style: normal;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-3);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links > a {
  padding: 8px 14px;
  font-size: 14.5px;
  color: var(--text-2);
  border-radius: 999px;
  transition: color 0.25s, background 0.25s;
  position: relative;
}
.nav-links > a:not(.btn):hover { color: var(--text); background: var(--surface); }
.nav-links > a.active:not(.btn) { color: var(--violet-2); }
.nav-cta { margin-left: 10px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: 10px;
  cursor: pointer;
}
.nav-toggle span {
  width: 20px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Hero ============ */
.hero {
  padding: calc(var(--nav-h) + 80px) 0 90px;
  position: relative;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 60px;
  align-items: center;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 12px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--stroke-2);
  font-size: 13px;
  color: var(--text-2);
  backdrop-filter: blur(10px);
  margin-bottom: 26px;
}
.pill-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6); }
  70% { box-shadow: 0 0 0 9px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.hero h1 {
  font-size: clamp(38px, 5.2vw, 66px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 22px;
}
.hero-title-sm {
  font-size: clamp(20px, 2.6vw, 32px);
  line-height: 1.22;
  white-space: nowrap;
}

.hero-sub {
  font-size: 17.5px;
  color: var(--text-2);
  max-width: 520px;
  margin-bottom: 34px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 32px; }

.hero-trust {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--text-3);
  flex-wrap: wrap;
}
.hero-trust b { color: var(--text-2); }
.stars { color: var(--amber); letter-spacing: 2px; font-size: 15px; }

/* 手机样机 */
.hero-visual { position: relative; display: flex; justify-content: center; }

.phone {
  position: relative;
  width: 296px;
  height: 600px;
  border-radius: 42px;
  background: linear-gradient(160deg, #1a1a2e, #0d0d18);
  border: 1px solid var(--stroke-2);
  padding: 12px;
  box-shadow: var(--shadow), var(--shadow-glow);
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0) rotate(-1.5deg); }
  50% { transform: translateY(-16px) rotate(-1.5deg); }
}

.phone-notch {
  position: absolute;
  top: 12px; left: 50%;
  transform: translateX(-50%);
  width: 100px; height: 22px;
  background: #0a0a14;
  border-radius: 0 0 14px 14px;
  z-index: 3;
}

.phone-screen {
  height: 100%;
  border-radius: 32px;
  background: linear-gradient(180deg, #10101d, #0a0a14);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 40px 14px 14px;
}

.app-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 6px 14px;
  border-bottom: 1px solid var(--stroke);
  margin-bottom: 14px;
}
.app-lock {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--emerald);
}
.app-status { font-size: 11px; color: var(--text-3); }

.chat { flex: 1; display: flex; flex-direction: column; gap: 10px; }
.bubble {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 12.5px;
  line-height: 1.5;
  opacity: 0;
  animation: bubbleIn 0.6s var(--ease) forwards;
}
.bubble.in {
  align-self: flex-start;
  background: var(--surface-2);
  border: 1px solid var(--stroke);
  border-bottom-left-radius: 5px;
  color: var(--text);
}
.bubble.out {
  align-self: flex-end;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.9), rgba(34, 211, 238, 0.75));
  color: #0a0a14;
  font-weight: 600;
  border-bottom-right-radius: 5px;
}
.bubble:nth-child(1) { animation-delay: 0.5s; }
.bubble:nth-child(2) { animation-delay: 1.1s; }
.bubble:nth-child(3) { animation-delay: 1.7s; }
.bubble:nth-child(4) { animation-delay: 2.3s; }
@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(12px) scale(0.96); }
  to { opacity: 1; transform: none; }
}
.bubble.file {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--violet-2);
}
.bubble.file i {
  display: block;
  font-style: normal;
  font-size: 10.5px;
  color: var(--text-3);
  margin-top: 2px;
}

.app-input {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--stroke);
  font-size: 12px;
  color: var(--text-3);
}
.send-dot {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--grad);
}

.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 12px 16px;
  border-radius: 14px;
  background: rgba(14, 14, 26, 0.82);
  border: 1px solid var(--stroke-2);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
  animation: floaty 7s ease-in-out infinite;
}
.float-card div { display: flex; flex-direction: column; line-height: 1.3; }
.float-card b { font-size: 14px; }
.float-card span { font-size: 11px; color: var(--text-3); }
.fc-1 { top: 12%; left: -8%; color: var(--emerald); animation-delay: -2s; }
.fc-2 { bottom: 16%; right: -6%; color: var(--cyan); animation-delay: -4.5s; }
.float-card b, .float-card span { color: var(--text); }
.float-card span { color: var(--text-3); }

/* 信任标 */
.logos { margin-top: 90px; text-align: center; }
.logos-label {
  font-size: 12.5px;
  color: var(--text-3);
  letter-spacing: 2px;
  text-transform: uppercase;
}
.logos-row {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px 40px;
}
.logos-row span {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-3);
  letter-spacing: 0.5px;
  opacity: 0.75;
  transition: color 0.3s, opacity 0.3s;
}
.logos-row span:hover { color: var(--violet-2); opacity: 1; }

/* ============ 通用区块 ============ */
.section { padding: 110px 0; position: relative; }

.section-head {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}
.section-head.left { text-align: left; margin-left: 0; }

.eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--violet-2);
  margin-bottom: 14px;
}
.section-head h2 {
  font-size: clamp(29px, 3.8vw, 44px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.section-head h2.nowrap { white-space: nowrap; }
@media (max-width: 640px) {
  .section-head h2.nowrap { white-space: normal; }
}
.section-head p { color: var(--text-2); font-size: 16.5px; }

.card {
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease),
    background 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

/* ============ 功能网格 ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}

.feature { padding: 32px 28px; position: relative; overflow: hidden; }
.feature::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(400px 200px at 50% 0%, rgba(139, 92, 246, 0.1), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
}
.feature:hover {
  transform: translateY(-6px);
  border-color: rgba(167, 139, 250, 0.35);
  background: var(--surface-2);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}
.feature:hover::before { opacity: 1; }

.feat-icon {
  width: 54px; height: 54px;
  border-radius: 15px;
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  border: 1px solid var(--stroke-2);
  transition: transform 0.4s var(--ease);
}
.feature:hover .feat-icon { transform: scale(1.08) rotate(-5deg); }

.i-violet  { background: rgba(139, 92, 246, 0.14); color: var(--violet-2); }
.i-cyan    { background: rgba(34, 211, 238, 0.13);  color: var(--cyan); }
.i-emerald { background: rgba(52, 211, 153, 0.13);  color: var(--emerald); }
.i-amber   { background: rgba(251, 191, 36, 0.13);  color: var(--amber); }
.i-blue    { background: rgba(96, 165, 250, 0.13);  color: var(--blue); }
.i-rose    { background: rgba(251, 113, 133, 0.13); color: var(--rose); }

.feature h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.feature p { color: var(--text-2); font-size: 14.8px; }

.tick {
  flex-shrink: 0;
  width: 21px; height: 21px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(52, 211, 153, 0.15);
  color: var(--emerald);
  font-size: 12px;
  font-weight: 700;
  margin-top: 3px;
}

/* ============ 下载 ============ */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}
.dl-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 24px;
  color: var(--text);
}
.dl-card:hover {
  transform: translateY(-5px);
  border-color: rgba(167, 139, 250, 0.45);
  background: var(--surface-2);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.42);
}
.dl-card svg { flex-shrink: 0; color: var(--text-2); transition: color 0.35s, transform 0.35s var(--ease); }
.dl-card:hover svg { color: var(--violet-2); transform: scale(1.1); }
.dl-info { display: flex; flex-direction: column; flex: 1; min-width: 0; }
.dl-os { font-size: 16px; font-weight: 700; }
.dl-store { font-size: 13px; color: var(--text-3); }
.dl-arrow {
  font-size: 19px;
  color: var(--text-3);
  transition: transform 0.35s var(--ease), color 0.35s;
}
.dl-card:hover .dl-arrow { color: var(--cyan); transform: translateY(3px); }
.dl-card.ghost { border-style: dashed; }
.dl-card.ghost:hover .dl-arrow { transform: translate(3px, -3px); }
.dl-card.is-soon { pointer-events: none; opacity: .5; }
.dl-card.is-soon svg { color: var(--text-3); transform: none; }
.dl-card.is-soon:hover { transform: none; border-color: var(--stroke); background: transparent; box-shadow: none; }
.dl-card.is-soon .dl-store { color: var(--amber); }

.dl-note { text-align: center; margin-top: 30px; color: var(--text-3); font-size: 14.5px; }
.dl-note b { color: var(--violet-2); }

/* ============ 定价 ============ */
.pricing { background: linear-gradient(180deg, transparent, rgba(34, 211, 238, 0.03), transparent); }
.price-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 22px;
  align-items: stretch;
}
.price-card {
  padding: 34px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
}
.price-card:hover { transform: translateY(-6px); border-color: rgba(167, 139, 250, 0.32); }
.price-card.featured {
  border-color: rgba(139, 92, 246, 0.5);
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.1), var(--surface));
  box-shadow: 0 20px 60px rgba(139, 92, 246, 0.18);
}
.price-badge {
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  padding: 5px 16px;
  border-radius: 999px;
  background: var(--grad);
  color: #0a0a14;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}
.price-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.price {
  font-size: 46px;
  font-weight: 900;
  line-height: 1;
  display: flex;
  align-items: baseline;
  gap: 2px;
  margin-bottom: 8px;
}
.price .cur { font-size: 22px; font-weight: 700; color: var(--text-2); }
.price i { font-style: normal; font-size: 14.5px; font-weight: 500; color: var(--text-3); margin-left: 4px; }
.price-desc { color: var(--text-3); font-size: 14.5px; margin-bottom: 24px; }
.price-card ul { display: grid; gap: 12px; margin-bottom: 28px; flex: 1; }
.price-card li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.8px;
  color: var(--text-2);
}

/* 标准版双档位（年付 / 永久） */
.price-options {
  display: grid;
  gap: 10px;
  margin-top: 4px;
}
.po-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid rgba(167, 139, 250, 0.22);
  border-radius: 12px;
  background: rgba(139, 92, 246, 0.06);
}
.po-row .btn { margin: 0; flex-shrink: 0; }
.po-price { font-size: 26px; font-weight: 800; line-height: 1; display: flex; align-items: baseline; gap: 6px; }
.po-price .cur { font-size: 16px; font-weight: 700; color: var(--text-2); }
.po-price i { font-style: normal; font-size: 13px; font-weight: 500; color: var(--text-3); }
.po-origin {
  font-style: normal;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-3);
  text-decoration: line-through;
  text-decoration-color: rgba(244, 114, 182, 0.75);
}
.po-note {
  font-size: 12.5px;
  color: var(--text-3);
  text-align: center;
  margin: 2px 0 0;
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ============ 联系 ============ */
.contact-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 60px;
  align-items: start;
}
.contact-copy h2 { font-size: clamp(28px, 3.6vw, 42px); font-weight: 800; line-height: 1.25; margin-bottom: 16px; }
.contact-copy > p { color: var(--text-2); font-size: 16.5px; margin-bottom: 32px; }

.contact-list { display: grid; gap: 20px; margin-bottom: 32px; }
.contact-list li { display: flex; align-items: flex-start; gap: 14px; }
.ci {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid var(--stroke-2);
  color: var(--violet-2);
}
.contact-list div { display: flex; flex-direction: column; line-height: 1.5; }
.contact-list b { font-size: 13px; color: var(--text-3); font-weight: 600; }
.contact-list a, .contact-list span:not(.ci) { font-size: 15.5px; color: var(--text); }
.contact-list a { transition: color 0.25s; }
.contact-list a:hover { color: var(--violet-2); }

.socials { display: flex; gap: 11px; }
.socials a {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--surface);
  border: 1px solid var(--stroke);
  color: var(--text-2);
  transition: all 0.3s var(--ease);
}
.socials a:hover {
  color: var(--text);
  border-color: rgba(167, 139, 250, 0.5);
  background: rgba(139, 92, 246, 0.14);
  transform: translateY(-3px);
}

/* 微信二维码占位区块 */
.wechat-qr {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 8px;
  padding: 18px;
  border: 1px solid rgba(167, 139, 250, 0.18);
  border-radius: 16px;
  background: rgba(139, 92, 246, 0.05);
}
.qr-card {
  width: 116px;
  height: 116px;
  flex-shrink: 0;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  display: grid;
  place-items: center;
}
.qr-img { width: 100%; height: 100%; display: block; }
.qr-info b { font-size: 15px; color: var(--text); }
.qr-info p { font-size: 13.5px; color: var(--text-3); margin-top: 6px; line-height: 1.55; }

/* 表单 */
.contact-form { padding: 34px 32px; }
.contact-form h3 { font-size: 21px; font-weight: 700; margin-bottom: 24px; }

.field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 18px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--text-2); }
.field label i { font-style: normal; color: var(--rose); }

.field input, .field select, .field textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--stroke);
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color 0.25s, background 0.25s, box-shadow 0.25s;
  resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: var(--text-3); }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: rgba(139, 92, 246, 0.6);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.14);
}
.field select { cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a8a8bd' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 17px;
  padding-right: 42px;
}
.field select option { background: #14141f; color: var(--text); }

.field.invalid input, .field.invalid textarea { border-color: rgba(251, 113, 133, 0.7); }
.err { font-size: 12.5px; color: var(--rose); min-height: 0; }

.checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text-2);
  margin-bottom: 22px;
  cursor: pointer;
}
.checkbox input {
  appearance: none;
  flex-shrink: 0;
  width: 18px; height: 18px;
  border-radius: 5px;
  border: 1px solid var(--stroke-2);
  background: rgba(255, 255, 255, 0.04);
  margin-top: 2px;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
}
.checkbox input:checked {
  background: var(--grad);
  border-color: transparent;
}
.checkbox input:checked::after {
  content: "✓";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 900;
  color: #0a0a14;
}
.checkbox.invalid input { border-color: rgba(251, 113, 133, 0.8); }

.form-success {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 16px;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  background: rgba(52, 211, 153, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.35);
  color: var(--emerald);
  font-size: 14px;
  animation: fadeSlide 0.4s var(--ease);
}

/* ============ CTA ============ */
.cta-band {
  padding: 90px 0;
  position: relative;
}
.cta-inner {
  text-align: center;
  padding: 64px 40px;
  border-radius: 28px;
  background:
    radial-gradient(700px 300px at 50% 0%, rgba(139, 92, 246, 0.22), transparent 70%),
    var(--surface);
  border: 1px solid var(--stroke-2);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}
.cta-inner h2 {
  font-size: clamp(27px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1.24;
  margin-bottom: 14px;
}
.cta-inner p { color: var(--text-2); font-size: 16.5px; margin-bottom: 30px; }

/* ============ 页脚 ============ */
.footer {
  border-top: 1px solid var(--stroke);
  padding: 62px 0 30px;
  background: rgba(6, 6, 12, 0.6);
  backdrop-filter: blur(10px);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.1fr 2fr;
  gap: 50px;
  padding-bottom: 46px;
}
.footer-brand p { color: var(--text-3); font-size: 14.5px; margin-top: 16px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}
.footer-col { display: flex; flex-direction: column; gap: 11px; }
.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.8px;
  margin-bottom: 4px;
}
.footer-col a {
  font-size: 14.2px;
  color: var(--text-3);
  transition: color 0.25s, transform 0.25s;
  width: fit-content;
}
.footer-col a:hover { color: var(--violet-2); transform: translateX(3px); }

.footer-bottom {
  border-top: 1px solid var(--stroke);
  padding-top: 26px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-3);
}

/* ============ 返回顶部 ============ */
.to-top {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 46px; height: 46px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: rgba(14, 14, 26, 0.85);
  border: 1px solid var(--stroke-2);
  color: var(--violet-2);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: all 0.35s var(--ease);
  z-index: 90;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: rgba(139, 92, 246, 0.22); transform: translateY(-3px); }

/* ============ 滚动入场动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }

/* 网格内元素依次入场 */
.feature-grid .reveal:nth-child(2),
.download-grid .reveal:nth-child(2),
.price-grid .reveal:nth-child(2) { transition-delay: 0.08s; }
.feature-grid .reveal:nth-child(3),
.download-grid .reveal:nth-child(3),
.price-grid .reveal:nth-child(3) { transition-delay: 0.16s; }
.feature-grid .reveal:nth-child(4),
.download-grid .reveal:nth-child(4) { transition-delay: 0.24s; }
.feature-grid .reveal:nth-child(5),
.download-grid .reveal:nth-child(5) { transition-delay: 0.32s; }
.feature-grid .reveal:nth-child(6),
.download-grid .reveal:nth-child(6) { transition-delay: 0.4s; }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 64px; text-align: center; }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-trust { justify-content: center; }
  .contact-inner { grid-template-columns: 1fr; gap: 46px; }
  .section-head.left { text-align: center; margin-left: auto; }
  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
  .footer-cols { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 860px) {
  :root { --nav-h: 64px; }

  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 16px 20px 26px;
    background: rgba(8, 8, 15, 0.97);
    backdrop-filter: blur(22px);
    border-bottom: 1px solid var(--stroke);
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.35s var(--ease);
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
  }
  .nav-links.open { transform: none; opacity: 1; visibility: visible; }
  .nav-links > a { padding: 13px 16px; font-size: 15.5px; border-radius: 10px; }
  .nav-cta { margin: 10px 0 0; justify-content: center; }

  .section { padding: 80px 0; }
  .hero { padding: calc(var(--nav-h) + 56px) 0 70px; }

  .logos { margin-top: 66px; }
  .cta-inner { padding: 48px 26px; }
}

@media (max-width: 560px) {
  .container { padding: 0 18px; }
  .hero h1 { font-size: 34px; }
  .hero-title-sm { font-size: 17px; }
  .hero-sub { font-size: 16px; }
  .btn { padding: 12px 22px; font-size: 14.5px; }
  .hero-actions { width: 100%; flex-direction: column; }
  .hero-actions .btn { width: 100%; }

  .phone { width: 262px; height: 540px; }
  .fc-1 { left: -4%; padding: 10px 13px; }
  .fc-2 { right: -2%; padding: 10px 13px; }

  .field-row { grid-template-columns: 1fr; gap: 0; }
  .contact-form { padding: 26px 20px; }
  .feature { padding: 26px 22px; }
  .price-card { padding: 30px 24px; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); gap: 26px; }
  .footer-bottom { flex-direction: column; text-align: center; align-items: center; }
  .to-top { right: 16px; bottom: 16px; }
  .logos-row { gap: 12px 22px; }
  .logos-row span { font-size: 13px; }
}

/* 无障碍：尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* 键盘焦点可见 */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 2px solid var(--violet-2);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ============================================================
   PrivaSub — 多页扩展样式
   ============================================================ */

/* ---- 内页 Hero ---- */
.page-hero { padding: calc(var(--nav-h) + 86px) 0 60px; text-align: center; position: relative; }
.breadcrumb { display: inline-flex; gap: 8px; align-items: center; font-size: 13px; color: var(--text-3); margin-bottom: 22px; }
.breadcrumb a { color: var(--text-3); transition: color .25s; }
.breadcrumb a:hover { color: var(--violet-2); }
.breadcrumb span { opacity: .5; }
.page-hero h1 { font-size: clamp(34px, 4.6vw, 56px); font-weight: 900; line-height: 1.15; letter-spacing: -1px; margin-bottom: 18px; }
.page-hero p { max-width: 720px; margin: 0 auto; font-size: 17px; color: var(--text-2); }
.page-hero .pill { margin-bottom: 26px; }

/* ---- 首页 App 窗口样机（字幕编辑器预览） ---- */
.app-window {
  width: 100%; max-width: 470px;
  border-radius: 18px;
  background: linear-gradient(160deg, #16162a, #0c0c18);
  border: 1px solid var(--stroke-2);
  box-shadow: var(--shadow), var(--shadow-glow);
  overflow: hidden;
  animation: floaty 6s ease-in-out infinite;
}
.aw-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid var(--stroke); background: rgba(255,255,255,.02); }
.aw-dot { width: 11px; height: 11px; border-radius: 50%; }
.aw-dot.r { background: #ff5f57; } .aw-dot.y { background: #febc2e; } .aw-dot.g { background: #28c840; }
.aw-title { margin-left: 8px; font-size: 12.5px; color: var(--text-3); }
.aw-body { padding: 16px; display: flex; flex-direction: column; gap: 14px; }
.aw-video {
  position: relative; height: 188px; border-radius: 12px; border: 1px solid var(--stroke); overflow: hidden;
  background:
    radial-gradient(130px 90px at 28% 28%, rgba(139,92,246,.38), transparent 70%),
    radial-gradient(150px 100px at 78% 72%, rgba(34,211,238,.3), transparent 70%),
    #0a0a14;
  display: flex; align-items: flex-end; justify-content: center; padding-bottom: 18px;
}
.aw-play { position: absolute; top: 14px; left: 14px; width: 34px; height: 34px; border-radius: 50%; background: rgba(14,14,26,.7); border: 1px solid var(--stroke-2); display: grid; place-items: center; color: var(--violet-2); }
.aw-sub { max-width: 82%; text-align: center; font-size: 13px; line-height: 1.5; color: #fff; background: rgba(0,0,0,.45); padding: 6px 12px; border-radius: 8px; backdrop-filter: blur(4px); }
.aw-list { display: flex; flex-direction: column; gap: 8px; }
.aw-row { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px; background: var(--surface); border: 1px solid var(--stroke); font-size: 12.5px; color: var(--text-2); }
.aw-row.cur { border-color: rgba(34,211,238,.5); background: rgba(34,211,238,.07); }
.aw-time { color: var(--text-3); font-variant-numeric: tabular-nums; width: 42px; flex-shrink: 0; }
.aw-progress { height: 7px; border-radius: 999px; background: var(--surface-2); overflow: hidden; margin-top: 6px; }
.aw-progress > i { display: block; height: 100%; width: 14%; background: var(--grad); border-radius: 999px; animation: awFill 4.5s ease-in-out infinite; }
@keyframes awFill { 0%,100% { width: 14%; } 50% { width: 88%; } }
.aw-status { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--text-3); margin-top: 4px; }
.aw-status b { color: var(--emerald); }

/* ---- 工作流（四步成片） ---- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.flow-step { padding: 28px 24px; text-align: center; position: relative; }
.flow-num { width: 56px; height: 56px; margin: 0 auto 18px; border-radius: 50%; display: grid; place-items: center; font-size: 18px; font-weight: 800; color: var(--violet-2); background: var(--surface); border: 1px solid var(--stroke-2); transition: transform .4s var(--ease), box-shadow .4s var(--ease); }
.flow-step:hover .flow-num { transform: scale(1.1); box-shadow: 0 0 30px rgba(139,92,246,.4); }
.flow-step h3 { font-size: 17px; margin-bottom: 8px; }
.flow-step p { font-size: 14px; color: var(--text-2); }
.flow-step .ftag { display: inline-block; margin-top: 12px; font-size: 11.5px; color: var(--cyan); border: 1px solid rgba(34,211,238,.3); padding: 3px 10px; border-radius: 999px; }

/* ---- 功能详情（交替行） ---- */
.feat-detail { display: grid; gap: 70px; }
.fd-row { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.fd-row.reverse .fd-media { order: 2; }
.fd-text .fd-tag { display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--violet-2); margin-bottom: 12px; }
.fd-text h3 { font-size: clamp(23px, 2.6vw, 32px); font-weight: 800; line-height: 1.25; margin-bottom: 14px; }
.fd-text p { color: var(--text-2); font-size: 16px; margin-bottom: 20px; }
.fd-text ul { display: grid; gap: 11px; }
.fd-text li { display: flex; align-items: flex-start; gap: 10px; font-size: 14.8px; color: var(--text-2); }
.fd-media { border-radius: var(--radius); border: 1px solid var(--stroke); background: var(--surface); padding: 20px; min-height: 240px; display: flex; flex-direction: column; justify-content: center; gap: 12px; }
.fd-mini { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 12px; background: rgba(255,255,255,.03); border: 1px solid var(--stroke); font-size: 13.5px; color: var(--text-2); }
.fd-mini b { color: var(--text); }
.fd-ico { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; flex-shrink: 0; background: rgba(139,92,246,.14); color: var(--violet-2); border: 1px solid var(--stroke-2); }

/* ---- 设计原则 ---- */
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.principle { padding: 30px 28px; }
.principle .pnum { font-size: 13px; font-weight: 800; color: var(--cyan); letter-spacing: 1px; margin-bottom: 14px; }
.principle h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.principle p { color: var(--text-2); font-size: 14.8px; }
.principle .pbad { color: var(--rose); font-size: 13px; margin-top: 12px; }

/* ---- 定价：购买按钮 & 模态框 ---- */
.price-card .btn { margin-top: auto; }
.price-period { font-size: 13px; color: var(--text-3); margin: -2px 0 22px; }
.modal { position: fixed; inset: 0; z-index: 300; display: none; align-items: center; justify-content: center; padding: 20px; }
.modal.open { display: flex; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(4,4,10,.72); backdrop-filter: blur(8px); animation: fadeIn .3s var(--ease); }
.modal-card {
  position: relative; width: 100%; max-width: 480px;
  background: var(--bg-2); border: 1px solid var(--stroke-2);
  border-radius: 22px; padding: 32px 30px; box-shadow: var(--shadow);
  animation: popIn .4s var(--ease); max-height: 90vh; overflow-y: auto;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes popIn { from { opacity: 0; transform: translateY(16px) scale(.98); } to { opacity: 1; transform: none; } }
.modal-head { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 4px; }
.modal-head h3 { font-size: 22px; font-weight: 800; }
.modal-head p { font-size: 14px; color: var(--text-3); margin-top: 4px; }
.modal-close { width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--stroke); background: var(--surface); color: var(--text-2); cursor: pointer; font-size: 18px; line-height: 1; transition: all .25s; flex-shrink: 0; }
.modal-close:hover { color: var(--text); border-color: var(--stroke-2); }
.order-summary { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px; border-radius: 14px; background: var(--surface); border: 1px solid var(--stroke); margin: 18px 0; }
.order-summary .os-name { font-size: 15px; font-weight: 700; }
.order-summary .os-price { font-size: 22px; font-weight: 900; }
.order-summary .os-price small { font-size: 13px; font-weight: 500; color: var(--text-3); }
.license-box { display: none; margin: 6px 0 16px; padding: 18px; border-radius: 14px; background: linear-gradient(180deg, rgba(52,211,153,.1), rgba(52,211,153,.03)); border: 1px dashed rgba(52,211,153,.5); text-align: center; }
.license-box.show { display: block; animation: popIn .4s var(--ease); }
.license-box .lb-label { font-size: 12.5px; color: var(--emerald); margin-bottom: 8px; }
.license-box .lb-key { font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; font-size: 17px; font-weight: 700; letter-spacing: 1px; color: var(--text); word-break: break-all; }
.copy-btn { margin-top: 14px; display: inline-flex; align-items: center; gap: 7px; padding: 9px 18px; border-radius: 999px; border: 1px solid var(--stroke-2); background: var(--surface); color: var(--text); cursor: pointer; font-size: 13.5px; font-weight: 600; transition: all .25s; }
.copy-btn:hover { border-color: var(--emerald); color: var(--emerald); }
/* 购买模态框：支付区与密钥操作 */
.pay-box { background: linear-gradient(180deg, rgba(96,165,250,.1), rgba(96,165,250,.03)); border-color: rgba(96,165,250,.5); }
.pay-box .lb-label { color: var(--azure, #60a5fa); }
.pay-box .pay-order { font-size: 13px; font-weight: 600; letter-spacing: 0; color: var(--text-2); }
.pay-box .pay-status { font-size: 13px; color: var(--text-3); margin: 10px 0 0; line-height: 1.6; }
.license-box .lb-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.modal-note { font-size: 12.5px; color: var(--text-3); margin-top: 14px; line-height: 1.6; }
.modal-note b { color: var(--text-2); }

/* ---- 下载：平台与方法 ---- */
.dl-platforms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.dl-section { padding-top: 30px; border-top: 1px solid var(--stroke); margin-top: 30px; }
.dl-section:first-of-type { border-top: none; padding-top: 0; margin-top: 0; }
.dl-section-head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.dl-section-head .ds-ico { width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center; background: var(--surface); border: 1px solid var(--stroke-2); color: var(--violet-2); }
.dl-section-head h3 { font-size: 20px; font-weight: 700; }
.dl-section-head span { font-size: 13.5px; color: var(--text-3); }
.dl-methods { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; }
.dl-method { display: flex; align-items: center; gap: 14px; padding: 16px 18px; border-radius: var(--radius-sm); background: var(--surface); border: 1px solid var(--stroke); transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease); }
.dl-method:hover { transform: translateY(-3px); border-color: rgba(167,139,250,.4); background: var(--surface-2); }
.dm-icon { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; flex-shrink: 0; background: rgba(34,211,238,.1); color: var(--cyan); border: 1px solid var(--stroke-2); }
.dm-body { flex: 1; min-width: 0; }
.dm-name { font-size: 15px; font-weight: 700; }
.dm-desc { font-size: 12.8px; color: var(--text-3); margin-top: 2px; }
.dm-action { flex-shrink: 0; padding: 9px 16px; border-radius: 999px; border: 1px solid var(--stroke-2); background: transparent; color: var(--violet-2); font-size: 13px; font-weight: 600; cursor: pointer; white-space: nowrap; transition: all .25s; }
.dm-action:hover { background: var(--grad); color: #0a0a14; border-color: transparent; }
.dl-tip { margin-top: 26px; padding: 18px 20px; border-radius: var(--radius-sm); background: rgba(139,92,246,.07); border: 1px solid rgba(139,92,246,.22); font-size: 14px; color: var(--text-2); display: flex; gap: 12px; align-items: flex-start; }
.dl-tip b { color: var(--violet-2); }

/* ---- 联系页：建议箱 ---- */
.suggest { margin-bottom: 30px; padding: 22px 24px; border-radius: var(--radius-sm); background: linear-gradient(180deg, rgba(34,211,238,.08), transparent); border: 1px solid rgba(34,211,238,.25); display: flex; gap: 14px; align-items: flex-start; }
.suggest .si { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; flex-shrink: 0; background: rgba(34,211,238,.14); color: var(--cyan); border: 1px solid rgba(34,211,238,.3); }
.suggest b { color: var(--text); }
.suggest p { font-size: 14px; color: var(--text-2); margin-top: 3px; }

/* 通用辅助 */
.lead { max-width: 720px; margin: 0 auto 12px; text-align: center; color: var(--text-2); font-size: 16.5px; }

/* ---- 响应式：多页扩展 ---- */
@media (max-width: 1024px) {
  .flow { grid-template-columns: repeat(2, 1fr); }
  .principles { grid-template-columns: 1fr; }
  .fd-row { grid-template-columns: 1fr; gap: 32px; }
  .fd-row.reverse .fd-media { order: 0; }
  .dl-platforms { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .flow { grid-template-columns: 1fr; }
  .page-hero { padding: calc(var(--nav-h) + 56px) 0 44px; }
}