:root {
  --brand: #3060f0;
  --brand-deep: #1f44b8;
  --navy: #0d1b3e;
  --ink: #111111;
  --ink-soft: #555555;
  --ink-faint: #888888;
  --line: #e7eaf2;
  --bg-alt: #f7f8fa;
  --white: #ffffff;
  --radius-card: 14px;
  --radius-img: 10px;
  --radius-btn: 6px;
}

/* 字体按页面子集加载（@font-face 见各 HTML 页面 <style>），
   页面只下载自己用到的字，体积从 4.3MB 降到 0.5-1.8MB */

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans CJK", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  cursor: pointer;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

.label {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .28em;
  color: var(--brand);
  text-transform: uppercase;
}

.label.light {
  color: rgba(255, 255, 255, .8);
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 40px);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -.01em;
}

h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.3;
}

.lead {
  margin: 16px 0 0;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 560px;
}

.section {
  padding: 108px 0;
}

/* ---------- 顶部导航（悬浮磨砂玻璃胶囊） ---------- */
.site-header {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  width: calc(100% - 32px);
  max-width: 1160px;
  border-radius: 16px;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(255, 255, 255, .72), rgba(255, 255, 255, .38));
  backdrop-filter: blur(20px) saturate(1.8);
  -webkit-backdrop-filter: blur(20px) saturate(1.8);
  border: 1px solid rgba(255, 255, 255, .65);
  box-shadow: 0 6px 30px rgba(10, 18, 40, .08);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 26px;
  height: 70px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-link {
  font-size: 14px;
  color: var(--ink-soft);
  transition: color .2s ease;
}

@media (hover: hover) {
  .nav-link:hover {
    color: var(--ink);
  }
}

.brand {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0;
  margin-left: -40px;
}

.brand img {
  position: absolute;
  z-index: 0;
  max-width: none;
  left: -44px;
  top: -46px;
  width: 170px;
  height: 170px;
  opacity: .35;
}

.brand-text {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin-left: 70px;
  padding: 2px 6px;
  line-height: 1.12;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .04em;
}

.brand-text em {
  font-style: normal;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .22em;
  color: #666666;
  text-transform: uppercase;
}

.nav-cta {
  margin-left: auto;
  display: flex;
}

/* 移动端悬浮菜单（放在导航外，避免被导航的裁剪裁掉） */
.mobile-menu {
  display: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform .25s ease, opacity .25s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
  height: 44px;
  padding: 0 22px;
  border: none;
  border-radius: var(--radius-btn);
  font-size: 14px;
  font-weight: 600;
  transition: background .2s ease, transform .18s ease, box-shadow .2s ease;
}

.btn-dark {
  background: var(--navy);
  color: #fff;
}

@media (hover: hover) {
  .btn-dark:hover {
    background: var(--brand);
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(48, 96, 240, .25);
  }
}

.btn:active {
  transform: scale(.98);
}

/* 触屏设备：所有按钮/链接的按压反馈 —— 仅按压时生效，松开立即恢复 */
@media (hover: none) {
  button:active,
  a:active,
  [role="button"]:active {
    transform: scale(.97);
    opacity: .88;
  }
}

/* 触屏按压反馈（JS 添加 .zx-pressed，兼容 iOS/微信等 :active 失效场景） */
.zx-pressed {
  transform: scale(.97);
  opacity: .88;
}

/* 触屏按压颜色反馈：与桌面悬停一致（:active + JS .zx-pressed 双保险） */
.nav-link:active,
.nav-link.zx-pressed { color: var(--ink); }

.btn-dark:active,
.btn-dark.zx-pressed {
  background: var(--brand);
  box-shadow: 0 10px 24px rgba(48, 96, 240, .25);
}

.btn:active .arrow,
.btn.zx-pressed .arrow { transform: translateX(3px); }

a.product-item:active,
a.product-item.zx-pressed {
  border-color: var(--brand);
  box-shadow: 0 14px 30px rgba(48, 96, 240, .12);
}

.channel-btn:active,
.channel-btn.zx-pressed {
  box-shadow: 0 12px 26px rgba(10, 18, 40, .08);
}
.channel-btn:nth-child(1):active,
.channel-btn:nth-child(1).zx-pressed { border-color: #ff5000; }
.channel-btn:nth-child(2):active,
.channel-btn:nth-child(2).zx-pressed { border-color: #111111; }
.channel-btn:nth-child(3):active,
.channel-btn:nth-child(3).zx-pressed { border-color: #ff2442; }
.channel-btn:nth-child(4):active,
.channel-btn:nth-child(4).zx-pressed { border-color: #07c160; }

.arrow-btn:active,
.arrow-btn.zx-pressed {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

.channel-modal-close:active,
.channel-modal-close.zx-pressed {
  background: var(--line);
  color: var(--ink);
}

.footer-links a:active,
.footer-links a.zx-pressed { color: #fff; }

.mobile-menu a:active,
.mobile-menu a.zx-pressed {
  color: #fff;
  background: var(--navy);
  border-radius: 8px;
}

.arrow {
  position: relative;
  top: -1px;
  font-size: 15px;
  line-height: 1;
  transition: transform .2s ease;
}

@media (hover: hover) {
  .btn:hover .arrow {
    transform: translateX(3px);
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}

.hero-bg,
.hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 40, .18), rgba(10, 18, 40, .45));
}

.hero-content {
  position: relative;
  z-index: 1;
  color: #fff;
  max-width: 860px;
}

.hero-content h1 {
  margin: 0;
  font-size: clamp(42px, 7.5vw, 76px);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: .02em;
}

.hero-content h1 em {
  font-style: normal;
  font-weight: 600;
}

.hero-content p {
  margin: 24px auto 0;
  max-width: 520px;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .88);
}

/* ---------- 关于 ---------- */
.about-main {
  max-width: 860px;
}

.about-main h2 {
  margin-bottom: 8px;
}

.thumbs {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 14px;
  margin-top: 44px;
}

.thumbs img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius-img);
}

/* ---------- 特色产品 ---------- */
.platform {
  background: var(--bg-alt);
}

.product-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.product-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: #fff;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

@media (hover: hover) {
  a.product-item:hover {
    border-color: var(--brand);
    box-shadow: 0 14px 30px rgba(48, 96, 240, .12);
    transform: translateY(-3px);
  }
}

.product-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: #eef2ff;
  color: var(--brand);
}

.product-icon svg {
  width: 22px;
  height: 22px;
}

.product-name {
  font-size: 16px;
  font-weight: 600;
}

.product-name em {
  display: block;
  font-style: normal;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-top: 2px;
}

.product-status {
  margin-top: auto;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
}

.product-status.live {
  background: #eef2ff;
  color: var(--brand);
}

.product-status.soon {
  background: #f1f3f8;
  color: #9aa3bd;
}

/* ---------- 使用场景 ---------- */
.case-card {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  margin-top: 40px;
}

.case-media img {
  width: 100%;
  height: 100%;
  min-height: 360px;
  object-fit: cover;
}

.case-body {
  padding: 48px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.case-body p {
  margin: 14px 0 28px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 440px;
}

.case-nav {
  display: flex;
  gap: 10px;
}

.arrow-btn {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius-btn);
  background: #fff;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.arrow-btn svg {
  width: 18px;
  height: 18px;
}

/* 仅在有悬停能力的设备上应用悬停态，避免手机点按后按钮“粘住”变蓝 */
@media (hover: hover) {
  .arrow-btn:hover {
    background: var(--navy);
    color: #fff;
    border-color: var(--navy);
  }
}

/* ---------- 找到我们 ---------- */
.contact {
  background: var(--bg-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 64px;
  align-items: start;
}

.channel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 26px;
}

.channel-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  text-align: left;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

@media (hover: hover) {
  .channel-btn:hover {
    box-shadow: 0 12px 26px rgba(10, 18, 40, .08);
    transform: translateY(-2px);
  }

  .channel-btn:nth-child(1):hover {
    border-color: #ff5000;
  }

  .channel-btn:nth-child(2):hover {
    border-color: #111111;
  }

  .channel-btn:nth-child(3):hover {
    border-color: #ff2442;
  }

  .channel-btn:nth-child(4):hover {
    border-color: #07c160;
  }
}

.channel-icon {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: #eef2ff;
  color: var(--brand);
}

.channel-icon svg {
  width: 18px;
  height: 18px;
}

.channel-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.channel-name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}

.channel-tag {
  display: block;
  font-size: 10px;
  color: var(--ink-faint);
  white-space: nowrap;
}

.channel-btn:nth-child(1) .channel-icon {
  background: #fff1e8;
  color: #ff5000;
}

.channel-btn:nth-child(2) .channel-icon {
  background: #f2f4f7;
  color: #111111;
}

.channel-btn:nth-child(3) .channel-icon {
  background: #ffecef;
  color: #ff2442;
}

.channel-btn:nth-child(4) .channel-icon {
  background: #e7f9ef;
  color: #07c160;
}

.info-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  margin-top: 6px;
}

.info-item.address {
  padding: 14px 12px;
  border-bottom: none;
}

.info-item span {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--brand);
  margin-bottom: 2px;
}

.info-item p {
  margin: 0;
  font-size: 15px;
}

/* ---------- 渠道弹窗（抖音口令 / 微信公众号） ---------- */
.channel-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.channel-modal[hidden] {
  display: none;
}

.channel-modal-mask {
  position: absolute;
  inset: 0;
  background: rgba(10, 18, 40, .5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.channel-modal-card {
  position: relative;
  width: 100%;
  max-width: 380px;
  padding: 28px 24px 26px;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 24px 60px rgba(10, 18, 40, .25);
  text-align: center;
  animation: channelModalIn .25s ease;
}

@keyframes channelModalIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.channel-modal-close {
  position: absolute;
  top: 10px;
  right: 14px;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--bg-alt);
  color: var(--ink-soft);
  font-size: 20px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background .2s ease, color .2s ease;
}

@media (hover: hover) {
  .channel-modal-close:hover {
    background: var(--line);
    color: var(--ink);
  }
}

.channel-modal-card h3 {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 700;
}

.channel-modal-text {
  margin: 0 0 20px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-alt);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  text-align: left;
  white-space: pre-line;
  word-break: break-word;
}

.channel-modal-feedback {
  margin: 12px 0 0;
  min-height: 18px;
  font-size: 13px;
  color: var(--brand);
}

.feedback-form {
  padding: 34px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: #fff;
}

.feedback-form h3 {
  margin-bottom: 22px;
}

.feedback-form label {
  display: block;
  margin-bottom: 16px;
}

.feedback-form label > span {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.req {
  color: #d64545;
  font-style: normal;
}

.feedback-form input,
.feedback-form textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  font-size: 14px;
  color: var(--ink);
  background: #fbfcff;
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
  resize: vertical;
}

.feedback-form input:focus,
.feedback-form textarea:focus {
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(48, 96, 240, .12);
}

.feedback-form .btn {
  width: 100%;
  margin-top: 4px;
}

.form-tip {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--brand);
  min-height: 20px;
}

.form-tip.error {
  color: #d64545;
}

/* ---------- 反馈滑块验证码 ---------- */
.captcha-slider {
  margin: 0 0 16px;
}

.captcha-track {
  position: relative;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #f2f5fb;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

.captcha-progress {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: rgba(48, 96, 240, .10);
}

.captcha-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--ink-soft);
  pointer-events: none;
  transition: color .2s ease;
}

.captcha-slider .captcha-knob {
  position: absolute;
  top: 50%;
  left: 3px;
  width: 40px;
  height: 40px;
  transform: translateY(-50%) scale(1);
  display: flex;
  align-items: center;
  justify-content: center;
  appearance: none;
  -webkit-appearance: none;
  border: none;
  border-radius: 50%;
  background: #fff;
  color: var(--brand);
  box-shadow: 0 2px 8px rgba(20, 30, 60, .18);
  padding: 0;
  margin: 0;
  line-height: 0;
  cursor: grab;
  touch-action: none;
}

.captcha-knob svg {
  display: block;
  width: 20px;
  height: 20px;
}

.captcha-slider .captcha-knob.dragging {
  cursor: grabbing;
}

.captcha-slider.passed .captcha-track {
  border-color: #2fbf71;
  background: #eef9f2;
}

.captcha-slider.passed .captcha-progress {
  background: rgba(47, 191, 113, .18);
}

.captcha-slider.passed .captcha-text {
  color: #1f9d57;
}

.captcha-slider.passed .captcha-knob {
  background: #2fbf71;
  color: #fff;
  cursor: default;
}

/* ---------- 全宽 CTA + 页脚（同一张底图） ---------- */
.cta-footer {
  position: relative;
  overflow: hidden;
  color: #fff;
}

.cta-footer-bg,
.cta-footer-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta-footer-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 40, .55), rgba(10, 18, 40, .45) 55%, rgba(8, 14, 32, .9));
}

.cta-content {
  position: relative;
  z-index: 1;
  padding: 110px 24px 70px;
  text-align: center;
}

.cta-content h2 {
  color: #fff;
  max-width: 640px;
  margin: 0 auto;
}

.cta-content p {
  margin: 16px auto 0;
  color: rgba(255, 255, 255, .85);
  max-width: 480px;
}

.footer-content {
  position: relative;
  z-index: 1;
  padding: 0 28px 30px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 18px 0;
  border-top: 1px solid rgba(255, 255, 255, .22);
  font-size: 12px;
  color: rgba(255, 255, 255, .75);
  max-width: 1124px;
  margin: 0 auto;
}

/* ICP 备案链接（工信部要求置于页脚并指向备案系统） */
.footer-top a {
  color: inherit;
  text-decoration: none;
}

@media (hover: hover) {
  .footer-top a:hover {
    color: #fff;
    text-decoration: underline;
  }
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 34px;
  padding: 18px 0 0;
  font-size: 15px;
  color: rgba(255, 255, 255, .92);
}

@media (hover: hover) {
  .footer-links a:hover {
    color: #fff;
  }
}

/* ---------- 声音记忆主页 ---------- */
.memory-hero {
  position: relative;
  min-height: 72vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 130px 24px 70px;
}

.memory-hero-bg,
.memory-hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.memory-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 40, .35), rgba(10, 18, 40, .55));
}

.memory-hero-content {
  position: relative;
  z-index: 1;
  color: #fff;
  max-width: 720px;
}

.memory-hero-content h1 {
  margin: 0;
  font-size: clamp(44px, 8vw, 84px);
  font-weight: 800;
  letter-spacing: .06em;
}

.memory-hero-content p {
  margin: 20px auto 0;
  max-width: 480px;
  font-size: 16px;
  color: rgba(255, 255, 255, .88);
}

.how-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 44px;
}

.how-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.how-step {
  padding: 28px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: #fff;
  transition: border-color .25s ease, background .25s ease, box-shadow .25s ease, transform .25s ease;
}

.how-step strong {
  display: block;
  font-size: 26px;
  font-weight: 300;
  color: var(--brand);
  margin-bottom: 10px;
}

.how-step span {
  font-size: 17px;
  font-weight: 600;
}

.how-step p {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.how-step.active {
  border-color: var(--brand);
  background: #eef2ff;
  box-shadow: 0 10px 26px rgba(48, 96, 240, .16);
  transform: translateY(-2px);
}

.how-step.active span {
  color: var(--brand);
}

.memory-cta {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  text-align: center;
  padding: 96px 24px;
}

.memory-cta h2 {
  margin-bottom: 30px;
}

.memory-cta .btn {
  height: 52px;
  padding: 0 40px;
  font-size: 16px;
}

.memory-footer {
  background: var(--navy);
  color: #fff;
  padding: 26px 28px 30px;
  text-align: center;
}

.memory-footer .footer-top {
  border-top: none;
  border-bottom: 1px solid rgba(255, 255, 255, .22);
  justify-content: center;
}

.memory-footer .footer-links {
  padding-top: 18px;
}

/* ---------- 入场动画 ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s ease, transform .7s ease;
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  .section {
    padding: 76px 0;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .case-card {
    grid-template-columns: 1fr;
  }

  .case-media img {
    height: 320px;
    min-height: 0;
  }

  .thumbs img {
    height: 240px;
  }
}

@media (max-width: 720px) {
  .site-header {
    top: 10px;
    width: calc(100% - 20px);
    border-radius: 14px;
  }

  .header-inner {
    gap: 12px;
    height: 60px;
  }

  .nav-links {
    display: none;
  }

  .mobile-menu {
    position: fixed;
    top: 76px;
    left: 10px;
    right: 10px;
    z-index: 49;
    flex-direction: column;
    padding: 8px 18px 12px;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: 0 12px 32px rgba(10, 18, 40, .12);
  }

  .mobile-menu.open {
    display: flex;
  }

  .mobile-menu a {
    padding: 13px 10px;
    border-bottom: 1px solid var(--line);
    font-size: 15px;
    color: var(--ink-soft);
  }

  .mobile-menu a:last-child {
    border-bottom: none;
  }

  @media (hover: hover) {
    .mobile-menu a:hover {
      color: #fff;
      background: var(--navy);
      border-radius: 8px;
    }
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    margin-left: auto;
  }

  .nav-cta .btn {
    height: 38px;
    padding: 0 14px;
    font-size: 13px;
  }

  .brand img {
    left: -34px;
    top: -32px;
    width: 128px;
    height: 128px;
    opacity: .3;
  }

  .brand-text {
    margin-left: 44px;
    font-size: 15px;
  }

  .brand {
    margin-left: -22px;
  }

  .hero {
    min-height: 78vh;
    padding: 100px 20px 60px;
  }

  .thumbs {
    grid-template-columns: 2fr 1fr;
  }

  .thumbs img {
    height: 180px;
  }

  .product-list {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .product-item {
    padding: 18px;
  }

  .channel-grid {
    grid-template-columns: 1fr 1fr;
  }

  .case-body {
    padding: 32px 26px;
  }

  .cta-content {
    padding: 90px 20px 50px;
  }

  .footer-top {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    gap: 22px;
  }

  .how-steps {
    grid-template-columns: 1fr;
  }

  .memory-hero {
    min-height: 60vh;
    padding: 110px 20px 60px;
  }
}