/* ============================================================
   云枢官网 — 纯静态单页样式
   视觉：明亮 SaaS 为主（A），深色 hero / CTA / footer 提质感（B）
   ============================================================ */

:root {
  --accent: #0d9488;
  --accent-deep: #0f766e;
  --cyan: #06b6d4;
  --dark-1: #06201d;
  --dark-2: #0b3733;
  --dark-line: rgba(255, 255, 255, 0.12);
  --ink: #0f172a;
  --muted: #57646f;
  --line: #dfe9e6;
  --bg-alt: #f0faf8;
  --radius: 14px;
  --container: 1120px;
  --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(13, 148, 136, 0.18); }

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

.container-narrow { max-width: 760px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  padding: 12px 22px;
  border-radius: 10px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.btn:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn-icon { width: 17px; height: 17px; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #fff;
  box-shadow: 0 6px 20px rgba(13, 148, 136, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(13, 148, 136, 0.45);
}

.btn-lg { padding: 15px 30px; font-size: 16px; border-radius: 12px; }
.btn-sm { padding: 9px 16px; font-size: 14px; }

.btn-ghost-light {
  color: #fff;
  border-color: var(--dark-line);
  background: rgba(255, 255, 255, 0.06);
}
.btn-ghost-light:hover { background: rgba(255, 255, 255, 0.14); }

.btn-outline-light {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
  background: transparent;
}
.btn-outline-light:hover { background: rgba(255, 255, 255, 0.1); }

/* 亮底用的描边次按钮（hero 联系客服开通） */
.btn-outline-dark {
  color: var(--ink);
  border-color: #c2e5df;
  background: rgba(255, 255, 255, 0.6);
}
.btn-outline-dark:hover {
  background: #fff;
  border-color: var(--accent);
  color: var(--accent-deep);
}

/* ---------- 导航（页首透明融入 hero，下滚变白毛玻璃） ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  /* 关键：sticky 在文档流里占位，透明时透出的是 body 白底而不是 hero——
     负 margin 把 hero 上提到页面最顶，让导航真正叠在 hero 底色上 */
  margin-bottom: -64px;
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.04em;
}
.brand-mark { width: 26px; height: 26px; border-radius: 6px; }

.nav-links {
  display: flex;
  gap: 28px;
  margin-left: auto;
}
.nav-links a {
  color: rgba(15, 23, 42, 0.62);
  text-decoration: none;
  font-size: 15px;
}
.nav-links a:hover { color: var(--accent-deep); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  color: var(--ink);
  /* 顶部一段完全均匀（导航透明时与内容同色无缝），向下淡出到纯白——
     与功能区零色差衔接，杜绝任何色带 */
  background: linear-gradient(180deg, #f0faf8 0%, #e9f7f4 55%, #ffffff 100%);
  padding: 150px 0 0;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}
.hero-glow-a {
  width: 560px; height: 560px;
  left: -160px; top: 160px;
  background: radial-gradient(circle, rgba(13, 148, 136, 0.18), transparent 70%);
  animation: drift 14s ease-in-out infinite alternate;
}
.hero-glow-b {
  width: 640px; height: 640px;
  right: -200px; top: 260px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.16), transparent 70%);
  animation: drift 18s ease-in-out infinite alternate-reverse;
}

@keyframes drift {
  from { transform: translate(0, 0); }
  to   { transform: translate(60px, 40px); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-badge {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
  border: 1px solid rgba(13, 148, 136, 0.3);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 28px;
  background: rgba(13, 148, 136, 0.07);
}

.hero-title {
  font-size: clamp(38px, 6.5vw, 64px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.hero-sub {
  margin-top: 18px;
  font-size: clamp(15px, 2.2vw, 18px);
  color: var(--muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

/* 两行分工：第一行讲处境（弱），第二行是搜索关键词「异地登录 / IP 异常」（强）。
   关键词是访客最先扫的字，字号与对比度都高于场景行。 */
.hero-sub-scene {
  font-size: clamp(14px, 2vw, 16px);
  color: var(--muted);
}

.hero-sub-key {
  font-size: clamp(17px, 2.6vw, 22px);
  font-weight: 600;
  color: var(--ink);
}

/* 关键词加重：只加粗字重与深色，不另起渐变——避免和主标题的渐变抢焦 */
.hero-sub-key strong {
  font-weight: 800;
  color: var(--accent-deep);
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 36px;
  flex-wrap: wrap;
  justify-content: center;
  scroll-margin-top: 96px; /* 锚点定位留出吸顶导航高度 */
}

.hero-meta {
  margin-top: 16px;
  font-size: 13px;
  color: rgba(15, 23, 42, 0.45);
}

/* ---------- hero 图位：CSS 界面示意卡 ---------- */
.hero-shot-wrap {
  position: relative;
  width: min(880px, 100%);
  margin: 56px auto 0;
  padding-bottom: 72px;
}

/* 悬浮玻璃标签：围绕示意卡的"活产品"构图 */
.float-chip {
  position: absolute;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(13, 148, 136, 0.22);
  border-radius: 999px;
  padding: 9px 16px;
  box-shadow: 0 10px 28px rgba(13, 148, 136, 0.16);
}
.float-chip-a { left: 2%;  top: 6%;  animation-delay: 0s; }
.float-chip-b { right: 1%; top: 26%; animation-delay: 1.2s; }
.float-chip-c { left: 7%;  top: 58%; animation-delay: 2.4s; }
@media (max-width: 900px) {
  .float-chip { font-size: 12px; padding: 7px 12px; }
  .float-chip-a { left: 0; top: 0; }
  .float-chip-b { right: 0; top: 30%; }
  .float-chip-c { left: 2%; top: 62%; }
}

.app-mock {
  background: #141d36;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px 14px 0 0;
  /* 亮底上的深色窗口：蓝调投影，弱化黑 */
  box-shadow: 0 -8px 50px rgba(13, 148, 136, 0.18), 0 30px 60px rgba(13, 148, 136, 0.22);
  overflow: hidden;
}

.app-mock-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.app-mock-bar .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}
.app-mock-title {
  margin-left: 10px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
}

.app-mock-body {
  display: flex;
  gap: 18px;
  padding: 20px;
  min-height: 300px;
}

.app-mock-side {
  width: 170px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-right: 18px;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.bar {
  display: block;
  height: 12px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.12);
}
.bar.on { background: rgba(13, 148, 136, 0.65); }
.w-40 { width: 40%; } .w-50 { width: 50%; } .w-60 { width: 60%; }
.w-70 { width: 70%; } .w-75 { width: 75%; } .w-80 { width: 80%; }
.w-85 { width: 85%; } .w-90 { width: 90%; }

.app-mock-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card-row {
  display: flex;
  gap: 14px;
  margin-bottom: 8px;
}

.mock-card {
  flex: 1;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chip {
  width: 44px; height: 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
}
.chip.on { background: rgba(56, 212, 255, 0.55); }

/* 真实截图就绪后替换用的样式 */
.hero-shot {
  display: block;
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px 14px 0 0;
  box-shadow: 0 -8px 60px rgba(13, 148, 136, 0.25), 0 30px 60px rgba(0, 0, 0, 0.45);
}

/* ---------- 通用 section ---------- */
.section { padding: 96px 0; }
.section-alt { background: #f0faf8; }

/* 功能区：纯白 + 两抹青碧氛围光（hero 已淡出到白，无任何色带） */
#features {
  background:
    radial-gradient(ellipse 60% 45% at 12% 0%, rgba(13, 148, 136, 0.05), transparent 70%),
    radial-gradient(ellipse 50% 40% at 90% 100%, rgba(6, 182, 212, 0.04), transparent 70%),
    #fff;
}

/* 深色段落（中段锚点，制造明暗节奏） */
.section-dark {
  background: linear-gradient(180deg, var(--dark-2), var(--dark-1));
  color: #fff;
}
.section-dark .section-sub { color: rgba(255, 255, 255, 0.6); }

/* 区块眉标：字距拉开的小标签，"高级感"的标志性细节 */
.kicker {
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.42em;
  text-indent: 0.42em; /* 抵消末字符字距，保证真正居中 */
  color: var(--accent);
  margin-bottom: 14px;
}
.section-dark .kicker { color: var(--cyan); }

.section-title {
  text-align: center;
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 800;
}

.section-sub {
  text-align: center;
  color: var(--muted);
  margin-top: 12px;
  font-size: 16px;
}

/* ---------- 功能卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.feature-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  /* 蓝调阴影：与主题同温，比灰黑"托得住" */
  box-shadow: 0 20px 44px rgba(13, 148, 136, 0.14);
  border-color: rgba(13, 148, 136, 0.4);
}

.feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  /* 靛紫渐变贴片 + 白色图标：卡片的最大颜色质量点 */
  background: linear-gradient(135deg, #0d9488, #0ea5e9);
  color: #fff;
  box-shadow: 0 8px 20px rgba(13, 148, 136, 0.35);
  margin-bottom: 20px;
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-card:hover .feature-icon {
  transform: scale(1.08);
  filter: brightness(1.12);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--muted);
  font-size: 14.5px;
}

.feature-card-hl {
  border-color: rgba(13, 148, 136, 0.45);
  background: linear-gradient(180deg, rgba(13, 148, 136, 0.05), #fff);
}

.feature-card-more {
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-decoration: none;
  border-style: dashed;
  color: inherit;
}
.feature-card-more h3 { color: var(--accent); }

/* ---------- 适用场景 ---------- */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 56px;
}

.scene-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.scene-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 44px rgba(13, 148, 136, 0.12);
  border-color: rgba(13, 148, 136, 0.35);
}

.scene-icon {
  width: 44px; height: 44px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-alt);
  color: var(--accent-deep);
  border: 1px solid rgba(13, 148, 136, 0.18);
  margin-bottom: 18px;
  transition: transform 0.25s ease, background-color 0.25s ease;
}
.scene-icon svg { width: 22px; height: 22px; }
.scene-card:hover .scene-icon { transform: scale(1.06); background: rgba(13, 148, 136, 0.1); }

.scene-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 12px;
}

.scene-before,
.scene-after {
  font-size: 14px;
  line-height: 1.65;
}
.scene-before { color: rgba(15, 23, 42, 0.45); }
.scene-after {
  color: var(--accent-deep);
  font-weight: 600;
  margin-top: 6px;
}

/* ---------- 适用范围 ---------- */
/* 场景区与适用范围同为白底，靠收紧下边距避免两段白之间出现大片空白 */
.section-tight { padding-top: 40px; }

.brand-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.brand-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.brand-card:hover { transform: translateY(-3px); box-shadow: 0 20px 44px rgba(13, 148, 136, 0.12); }

/* 韵达·韵呼宝：已验证能力，用渐变描边与功能高亮卡同款视觉 */
.brand-card-hl {
  border-color: transparent;
  background:
    linear-gradient(180deg, rgba(13, 148, 136, 0.05), #ffffff) padding-box,
    linear-gradient(135deg, rgba(13, 148, 136, 0.65), rgba(56, 212, 255, 0.65)) border-box;
}

.brand-card h3 {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: 0.01em;
}

.brand-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.brand-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  color: var(--muted);
}
/* 勾选点：不引图标字体，纯 CSS 画 */
.brand-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 7px;
  width: 10px; height: 6px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}

.brand-note {
  text-align: center;
  margin-top: 32px;
  font-size: 14.5px;
  color: var(--muted);
}
.brand-note a { color: var(--accent-deep); font-weight: 600; text-decoration: none; }
.brand-note a:hover { text-decoration: underline; }

/* ---------- 三步开通（深色段） ---------- */
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 64px;
  counter-reset: step;
}

.step {
  position: relative;
  text-align: center;
  padding: 0 12px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(13, 148, 136, 0.3);
  margin-bottom: 20px;
}

.step h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14.5px; }

/* 步骤连接线（桌面端） */
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 26px;
  left: calc(50% + 40px);
  width: calc(100% - 80px);
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--line) 0 8px, transparent 8px 16px);
}

/* ---------- FAQ ---------- */
.faq-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  margin-top: 16px;
  overflow: hidden;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 56px 18px 22px;
  font-weight: 600;
  font-size: 16px;
  position: relative;
  user-select: none;
  transition: background-color 0.2s ease;
}
.faq-item summary:hover { background: #f1f4ff; }
.faq-item summary::-webkit-details-marker { display: none; }

/* 展开指示（+ 旋转成 ×） */
.faq-item summary::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 12px; height: 12px;
  transform: translateY(-50%);
  background:
    linear-gradient(currentColor, currentColor) center / 12px 2px no-repeat,
    linear-gradient(currentColor, currentColor) center / 2px 12px no-repeat;
  color: var(--muted);
  transition: transform 0.2s ease;
}
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }

.faq-a {
  padding: 0 22px 20px;
  color: var(--muted);
  font-size: 15px;
}

/* ---------- CTA（卡片式收尾：浅色底 + 青碧渐变大圆角卡） ---------- */
.cta {
  background: #fff;
  padding: 16px 0 72px;
}
.cta-card {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  background: linear-gradient(120deg, #0f766e 0%, #0d9488 45%, #14b8a6 80%, #2dd4bf 125%);
  color: #fff;
  padding: 52px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
  box-shadow: 0 24px 60px rgba(13, 148, 136, 0.28);
}
.cta-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 70% 90% at 75% 50%, #000 20%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 90% at 75% 50%, #000 20%, transparent 75%);
  pointer-events: none;
}
.cta-text { position: relative; z-index: 1; }

.cta-text h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 800;
  margin-bottom: 12px;
}

.cta-text p {
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 28px;
  max-width: 480px;
}

/* 渐变卡上的主按钮：白底青字 */
.btn-white {
  background: #fff;
  color: #0f766e;
  box-shadow: 0 8px 22px rgba(6, 32, 29, 0.28);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(6, 32, 29, 0.36), inset 0 0 0 100px rgba(255, 255, 255, 0);
}
.btn-white:active { transform: translateY(0) scale(0.97); }

.qr-box {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: #fff;
  border-radius: 16px;
  padding: 16px 16px 12px;
  color: var(--ink);
  box-shadow: 0 16px 40px rgba(6, 32, 29, 0.3);
}

.qr-img, .qr-fallback {
  width: 118px;
  height: 118px;
  border-radius: 8px;
}

.qr-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--bg-alt);
  border: 1px dashed var(--line);
}

/* display:flex 会压过 hidden 属性的 UA 样式，必须显式压回来 */
.qr-fallback[hidden] { display: none; }

.qr-fallback-label { font-size: 13px; color: var(--muted); }
.qr-fallback-id { font-size: 14px; font-weight: 700; word-break: break-all; padding: 0 10px; text-align: center; }

.qr-caption { font-size: 13px; color: var(--muted); }

/* ---------- footer（浅色收尾；备案号一行小字最底） ---------- */
.footer {
  background: #fff;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13.5px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  padding-top: 26px;
}

.footer-links { display: flex; gap: 22px; }
.footer a { color: var(--muted); text-decoration: none; }
.footer a:hover { color: var(--accent-deep); }

.icp-line {
  text-align: center;
  font-size: 12px;
  color: rgba(15, 23, 42, 0.35);
  padding-top: 10px;
  padding-bottom: 18px;
}

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .step:not(:last-child)::after { display: none; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .nav-links { display: none; }
  .hero { padding-top: 116px; }
  /* 首屏标题固定两行时手机上会撑高、把下载按钮顶出首屏，改为自然换行 */
  .hero-br { display: none; }
  .hero-title { font-size: clamp(27px, 8.2vw, 40px); }
  .hero-actions { flex-direction: column; align-items: stretch; width: 100%; max-width: 340px; }
  .hero-actions .btn { justify-content: center; }
  .feature-grid { grid-template-columns: 1fr; }
  .scene-grid { grid-template-columns: 1fr; gap: 16px; margin-top: 40px; }
  .scene-card { padding: 24px 20px; }
  .brand-grid { grid-template-columns: 1fr; gap: 16px; margin-top: 36px; }
  .brand-card { padding: 26px 22px; }
  .section-tight { padding-top: 24px; }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .app-mock-body { min-height: 220px; }
  .app-mock-side { display: none; }
  .cta-card { flex-direction: column; align-items: flex-start; padding: 36px 28px; }
  .qr-box { align-self: center; }
  .footer-inner { flex-direction: column; align-items: center; text-align: center; gap: 14px; }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-glow-a, .hero-glow-b { animation: none; }
  .btn, .feature-card, .faq-item summary::after { transition: none; }
  .btn-primary:hover, .feature-card:hover { transform: none; }
  .scene-card, .brand-card, .scene-icon { transition: none; }
  .scene-card:hover, .brand-card:hover, .scene-card:hover .scene-icon { transform: none; }
}

/* ============================================================
   动效与质感层（polish-website-premium）
   原则：只动 transform/opacity；默认可见（仅 html.js 下应用初始隐藏态）；
        reduced-motion 下装饰动效全停、状态反馈保留。
   ============================================================ */

/* ---------- 滚动渐入（默认可见：初始隐藏仅在 html.js 下生效） ---------- */
html.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--d, 0ms);
}
html.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Hero：标题焦点词常驻渐变（不用移动流光——扫到一半像 bug） ---------- */
.hero-title {
  color: var(--ink);
}
.hero-title .grad {
  background: linear-gradient(115deg, #0d9488 20%, #0ea5e9 60%, #06b6d4 115%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- Hero：网格线氛围层（静态、极淡，亮底用蓝线） ---------- */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(13, 148, 136, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13, 148, 136, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
  pointer-events: none;
}

/* ---------- Hero：光晕呼吸（opacity 循环，与 drift 的 transform 不冲突） ---------- */
.hero-glow-a { animation: drift 14s ease-in-out infinite alternate, breathe 9s ease-in-out infinite; }
.hero-glow-b { animation: drift 18s ease-in-out infinite alternate-reverse, breathe 11s ease-in-out infinite reverse; }
@keyframes breathe {
  0%, 100% { opacity: 0.72; }
  50%      { opacity: 1; }
}

/* ---------- Hero：示意卡（用户反馈：浮动看着奇怪，改静止） ---------- */

/* ---------- 功能卡片：sheen 光泽 + 描边/图标反馈 ---------- */
.feature-card {
  position: relative;
  overflow: hidden;
}
.feature-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 42%, rgba(255, 255, 255, 0.45) 50%, transparent 58%);
  transform: translateX(-130%);
  transition: transform 0.6s ease;
  pointer-events: none;
}
.feature-card:hover::after { transform: translateX(130%); }

.feature-icon { transition: transform 0.25s ease, filter 0.25s ease; }
.feature-card:hover .feature-icon {
  transform: scale(1.08);
  filter: brightness(1.12);   /* 渐变贴片提亮，不再覆盖回平涂 */
}

/* 高亮卡：常驻 1px 渐变描边（双层背景实现，border-image 会丢圆角） */
.feature-card-hl {
  border-color: transparent;
  background:
    linear-gradient(180deg, rgba(13, 148, 136, 0.05), #ffffff) padding-box,
    linear-gradient(135deg, rgba(13, 148, 136, 0.65), rgba(56, 212, 255, 0.65)) border-box;
}

/* ---------- 主按钮：hover 内光晕 + active 反馈 ---------- */
.btn-primary {
  position: relative;
  overflow: hidden;
}
.btn-primary:hover {
  box-shadow: 0 10px 26px rgba(13, 148, 136, 0.45), inset 0 0 20px rgba(255, 255, 255, 0.28);
}
.btn-primary:active { transform: translateY(0) scale(0.97); }

/* ---------- 导航滚动态 + 进度线 ---------- */
.nav-inner { transition: height 0.25s ease; }
.nav.is-scrolled {
  background: rgba(255, 255, 255, 0.82);
  border-bottom-color: rgba(15, 23, 42, 0.06);
  box-shadow: 0 6px 24px rgba(13, 148, 136, 0.08);
}
.nav.is-scrolled .nav-inner { height: 54px; }
/* （滚动进度线已按用户反馈移除——顶部"自动增长"的条观感奇怪） */

/* ---------- 动效层的 reduced-motion 降级（后声明覆盖前文） ---------- */
@media (prefers-reduced-motion: reduce) {
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .hero-title { animation: none; -webkit-text-fill-color: currentColor; background: none; }
  .app-mock { animation: none; }
  .float-chip { animation: none; }
  .feature-card::after { display: none; }
  .hero-glow-a, .hero-glow-b { animation: none; opacity: 0.85; }
}