/* ============ 卜丁官网 设计系统 ============ */
:root {
  --ink: #171b26;
  --ink-2: #232838;
  --ink-3: #565d6e;
  --paper: #faf7f1;
  --paper-2: #f3eee4;
  --brand: #5ac2df;
  --brand-deep: #2e8fb0;
  --brand-tint: #e3f4fa;
  --amber: #ffb200;
  --line: #e6dfd2;
  --line-dark: #303648;
  --r-md: 14px;
  --r-lg: 20px;
  --shadow: 0 18px 44px -18px rgba(23, 27, 38, 0.22);
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-en: "Archivo", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-cn);
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

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

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  font-weight: 900;
}

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

/* ---------- 通用 ---------- */
.kicker {
  font-family: var(--font-en);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--brand);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--brand);
}

.sec-head {
  margin-bottom: 42px;
  max-width: 760px;
}

.sec-head h2 {
  font-size: clamp(28px, 3.6vw, 40px);
  margin: 12px 0 10px;
  letter-spacing: 0.01em;
}

.sec-head p {
  color: var(--ink-3);
  font-size: 16px;
}

.section {
  padding: 92px 0;
  position: relative;
}

.section-tight {
  padding: 64px 0;
}

.section-flush {
  padding-top: 0;
}

.dark {
  background: var(--ink);
  color: #f4f2ec;
}

.dark .sec-head p {
  color: #b9bcc6;
}

.accent-cyan {
  color: #8fd9ec;
}

.accent-amber {
  color: var(--amber);
}

.accent-green {
  color: #7ef2a1;
}

.accent-ice {
  color: #9fe3f5;
}

/* 大号描边英文装饰词 */
.ghost-word {
  position: absolute;
  top: 34px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-en);
  font-weight: 900;
  white-space: nowrap;
  font-size: clamp(56px, 10vw, 138px);
  letter-spacing: 0.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(23, 27, 38, 0.10);
  pointer-events: none;
  user-select: none;
  z-index: 0;
  max-width: 99vw;
  overflow: hidden;
}

.dark .ghost-word {
  -webkit-text-stroke: 1px rgba(244, 242, 236, 0.12);
}

.section>.container {
  position: relative;
  z-index: 1;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  border: 2px solid transparent;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-brand {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 12px 26px -12px rgba(90, 194, 223, 0.65);
}

.btn-brand:hover {
  background: var(--brand-deep);
}

.btn-ghost {
  border-color: rgba(23, 27, 38, 0.25);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.btn-light {
  background: #fff;
  color: var(--ink);
  border-color: #fff;
}

.btn-light:hover {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}

.btn-outline-light {
  border-color: rgba(244, 242, 236, 0.4);
  color: #f4f2ec;
}

.btn-outline-light:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

/* reveal 动效 */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* ============ 头部 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 247, 241, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 10px 30px -18px rgba(23, 27, 38, 0.18);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 22px;
  box-shadow: 0 6px 16px -6px rgba(90, 194, 223, 0.6);
}

.logo img.logo-mark {
  object-fit: cover;
  display: block;
  background: none;
}

.logo-word {
  height: 28px;
  width: auto;
  display: block;
}

.site-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav-link {
  padding: 8px 13px;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-3);
  transition: 0.2s;
  position: relative;
}

.nav-link:hover {
  color: var(--brand);
  background: var(--brand-tint);
}

.nav-link.active {
  color: var(--brand);
  font-weight: 700;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 2px;
  height: 3px;
  border-radius: 2px;
  background: var(--brand);
}

.header-cta {
  padding: 9px 20px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  transition: 0.25s;
  flex-shrink: 0;
}

.header-cta:hover {
  background: var(--brand);
  transform: translateY(-1px);
}

.menu-btn {
  display: none;
  margin-left: auto;
  background: none;
  border: 0;
  width: 40px;
  height: 40px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  align-items: center;
}

.menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: 0.3s;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 10px 6vw 22px;
  border-top: 1px solid var(--line);
}

.mobile-menu a {
  padding: 12px 4px;
  font-size: 16px;
  font-weight: 600;
  border-bottom: 1px dashed var(--line);
}

.mobile-menu a.active {
  color: var(--brand);
}

.mobile-menu .mobile-cta {
  margin-top: 14px;
  background: var(--brand);
  color: #fff;
  text-align: center;
  border-radius: 12px;
  border: 0;
  font-weight: 700;
}

.site-header.open .menu-btn span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.site-header.open .menu-btn span:nth-child(2) {
  opacity: 0;
}

.site-header.open .menu-btn span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--ink);
  color: #cfd2da;
  margin-top: 40px;
}

.footer-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 44px 0;
  border-bottom: 1px solid var(--line-dark);
  flex-wrap: wrap;
}

.footer-band h3 {
  color: #fff;
  font-size: clamp(20px, 2.6vw, 28px);
}

.footer-band p {
  color: #9aa0ae;
  font-size: 14px;
  letter-spacing: 0.14em;
  margin-top: 6px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.8fr 1.3fr;
  gap: 40px;
  padding: 56px 0;
}

.f-col h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
  letter-spacing: 0.06em;
}

.f-col a {
  display: block;
  padding: 5px 0;
  font-size: 14px;
  color: #b6bac4;
  transition: 0.2s;
}

.f-col a:hover {
  color: var(--brand);
  transform: translateX(3px);
}

.f-brand .logo {
  margin-bottom: 16px;
}

.f-brand p {
  font-size: 13px;
  color: #9aa0ae;
  line-height: 1.9;
}

.f-hot {
  margin-top: 14px;
  font-family: var(--font-en);
  font-weight: 800;
  font-size: 24px !important;
  color: #fff !important;
  letter-spacing: 0.02em;
}

.qr-row {
  display: flex;
  gap: 12px;
}

.qr-item {
  position: relative;
  text-align: center;
  cursor: pointer;
}

.qr-item>span {
  display: block;
  font-size: 11px;
  margin-top: 8px;
  color: #9aa0ae;
}

.qr-img {
  width: 72px;
  height: 72px;
  border-radius: 10px;
  object-fit: contain;
  display: block;
  background: #fff;
}

.qr-pop {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 14px);
  transform: translateX(-50%) translateY(8px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  background: #fff;
  color: #4a4a4a;
  border-radius: 12px;
  padding: 14px 14px 12px;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.28);
  text-align: center;
  z-index: 30;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  white-space: nowrap;
}

.qr-pop::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -7px;
  margin-left: -7px;
  border: 7px solid transparent;
  border-top-color: #fff;
}

.qr-pop::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 18px;
}

.qr-pop img {
  width: 120px;
  height: 120px;
  max-width: none;
  object-fit: contain;
  display: block;
  margin: 0 auto;
  border-radius: 6px;
  background: #f4f4f4;
}

.qr-pop span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  font-weight: 500;
  color: #555;
}

.qr-item:hover .qr-pop,
.qr-item.open .qr-pop {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.qr-row .qr-item:last-child .qr-pop {
  left: auto;
  right: -6px;
  transform: translateY(8px);
}

.qr-row .qr-item:last-child .qr-pop::after {
  left: auto;
  right: 28px;
  margin-left: 0;
}

.qr-row .qr-item:last-child:hover .qr-pop,
.qr-row .qr-item:last-child.open .qr-pop {
  transform: translateY(0);
}

.qr-ph {
  width: 66px;
  height: 66px;
  border-radius: 10px;
  position: relative;
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0.03));
  border: 1px dashed rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(6px);
}

.qr-ph::after {
  content: "码";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(159, 227, 245, 0.75);
  font-size: 18px;
  font-weight: 700;
}

.qr-ph--light {
  background: #eff9fc;
  border-color: #cde8f1;
}

.qr-ph--light::after {
  color: #7aa8b8;
}

.f-note {
  font-size: 11px !important;
  margin-top: 10px;
  color: #6f7585 !important;
}

.footer-legal {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
  padding: 20px 0 28px;
  border-top: 1px solid var(--line-dark);
  font-size: 12px;
  color: #7c8292;
}

/* ============ 各页共用 Hero 结构 ============ */
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  position: relative;
}

.hero-copy .kicker {
  margin-bottom: 22px;
}

.hero-copy h1 {
  font-size: clamp(34px, 4.6vw, 58px);
  letter-spacing: 0.01em;
  margin-bottom: 18px;
}

.hero-copy h1 em {
  font-style: normal;
  color: var(--brand);
}

.hero-sub {
  font-size: 17px;
  color: var(--ink-3);
  max-width: 520px;
  margin-bottom: 14px;
}

.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-note {
  margin-top: 22px;
  font-size: 13px;
  color: var(--ink-3);
}

.hero-note b {
  color: var(--brand);
}

.hero-art {
  width: min(420px, 88%);
  margin: 0 auto;
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
}

.cabinet-stage {
  position: relative;
  padding: 34px;
  border-radius: 26px;
  background: linear-gradient(160deg, #fff, #eff9fc);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.float-chip {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 9px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  box-shadow: var(--shadow);
  animation: floaty 4.5s ease-in-out infinite;
}

.float-chip .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--brand);
}

.float-chip .dot-amber {
  background: var(--amber);
}

.float-chip .dot-green {
  background: #22c55e;
}

.float-chip small {
  display: block;
  font-weight: 400;
  color: var(--ink-3);
  font-size: 11px;
}

.fc-1 {
  top: 6%;
  left: -26px;
}

.fc-2 {
  bottom: 14%;
  right: -30px;
  animation-delay: 1.4s;
}

.fc-3 {
  top: 38%;
  right: -14px;
  animation-delay: 0.7s;
}

@keyframes floaty {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-9px);
  }
}

/* 关于摘要 */
.about-brief {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.about-brief h2 {
  font-size: clamp(26px, 3.2vw, 36px);
  margin: 12px 0 18px;
}

.about-brief p {
  color: var(--ink-3);
  margin-bottom: 14px;
}

.about-brief .btn {
  margin-top: 18px;
}

.dark .about-brief h2 {
  color: #fff;
  margin-top: 12px;
  margin-bottom: 20px;
}

.about-visual {
  border-radius: var(--r-lg);
  background: var(--ink);
  color: #fff;
  padding: 38px 34px;
  position: relative;
  overflow: hidden;
}

.about-visual::before {
  content: "GO";
  position: absolute;
  right: -26px;
  bottom: -56px;
  font-family: var(--font-en);
  font-weight: 900;
  font-size: 118px;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.08);
}

.about-visual h4 {
  font-size: 15px;
  color: var(--amber);
  letter-spacing: 0.2em;
  margin-bottom: 14px;
  font-family: var(--font-en);
}

.av-line {
  display: flex;
  justify-content: space-between;
  padding: 13px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.14);
  font-size: 14px;
}

.av-line:last-child {
  border: 0;
}

.av-line b {
  font-family: var(--font-en);
  font-weight: 800;
  color: #fff;
  font-size: 17px;
}

/* 页面通用 hero（内页） */
.page-hero {
  position: relative;
  padding: 76px 0 70px;
  overflow: hidden;
}

.page-hero .hero-inner {
  grid-template-columns: 1.05fr 0.95fr;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(23, 27, 38, 0.04) 1px, transparent 1px);
  background-size: 100% 44px;
  opacity: 0.6;
  pointer-events: none;
}

.ph-dark {
  background: var(--ink);
  color: #f4f2ec;
}

.ph-dark h1 {
  color: #fff;
}

.ph-dark .hero-note {
  color: #9aa0ae;
}

.page-hero h1 {
  font-size: clamp(30px, 4vw, 48px);
  margin: 14px 0 16px;
}

/* 通用卡片行 */
.card-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card-row.col-4 {
  grid-template-columns: repeat(4, 1fr);
}

.info-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 30px 26px;
  transition: 0.28s;
  position: relative;
  overflow: hidden;
}

.info-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: rgba(90, 194, 223, 0.55);
}

.info-card .tag-no {
  font-family: var(--font-en);
  font-weight: 900;
  color: var(--brand);
  font-size: 15px;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
  display: block;
}

.info-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.info-card p {
  font-size: 14px;
  color: var(--ink-3);
}

.info-card .glass-ico {
  margin-bottom: 14px;
}

.info-card .lead {
  margin-top: 12px;
}

.info-card .lead-tight {
  margin-top: 6px;
}

.info-card.dark-card {
  background: var(--ink-2);
  border-color: var(--line-dark);
  color: #f4f2ec;
}

.info-card.dark-card h3,
.info-card.dark-card h4 {
  color: #fff;
}

.info-card.dark-card p {
  color: #a9aeba;
}

.info-card.brand-card {
  background: linear-gradient(155deg, var(--brand), var(--brand-deep));
  border: 0;
  color: #fff;
}

.info-card.brand-card .tag-no {
  color: rgba(255, 255, 255, 0.75);
}

.info-card.brand-card p {
  color: rgba(255, 255, 255, 0.85);
}

.info-card .tag-no.accent-cyan,
.info-card.dark-card h4.accent-cyan {
  color: #8fd9ec;
}

.info-card .tag-no.accent-amber,
.info-card.dark-card h4.accent-amber {
  color: var(--amber);
}

.info-card .tag-no.accent-green,
.info-card.dark-card h4.accent-green {
  color: #7ef2a1;
}

.info-card .tag-no.accent-ice,
.info-card.dark-card h4.accent-ice {
  color: #9fe3f5;
}

.info-card.glass {
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0.03));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: rgba(255, 255, 255, 0.16);
}

.info-card.glass h3,
.info-card.glass h4 {
  color: #fff;
}

/* 步骤条 */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 26px 22px 6px;
}

.step::before {
  counter-increment: step;
  content: "0"counter(step);
  font-family: var(--font-en);
  font-weight: 900;
  font-size: 34px;
  line-height: 1;
  color: var(--brand);
  display: block;
  margin-bottom: 22px;
}

.step::after {
  content: "";
  position: absolute;
  top: 68px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--line);
  z-index: -1;
}

.step h4 {
  font-size: 16px;
  margin-bottom: 8px;
}

.step p {
  font-size: 13.5px;
  color: var(--ink-3);
}

.dark .step {
  color: #f4f2ec;
}

.dark .step h4 {
  color: #fff;
}

.dark .step p {
  color: #a9aeba;
}

/* 大数字列表 */
.bignum-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.bignum {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 34px 28px;
}

.bignum .num {
  font-family: var(--font-en);
  font-weight: 900;
  font-size: 42px;
  color: var(--ink);
}

.bignum .num i {
  font-style: normal;
  color: var(--brand);
}

.bignum p {
  color: var(--ink-3);
  font-size: 14px;
  margin-top: 6px;
}

/* CTA band */
.cta-follow {
  margin-top: 44px;
}

.cta-band {
  background: linear-gradient(130deg, var(--brand), #2b7f9e);
  border-radius: 24px;
  padding: 52px 48px;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 26px;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.09);
  right: -80px;
  top: -120px;
}

.cta-band::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.16), transparent 40%);
  pointer-events: none;
}

.cta-band>* {
  position: relative;
  z-index: 1;
}

.cta-band h3 {
  font-size: clamp(22px, 2.8vw, 30px);
  margin-bottom: 8px;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
}

.cta-band .cta-right {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}

.cta-phone {
  font-family: var(--font-en);
  font-weight: 900;
  font-size: 30px;
  letter-spacing: 0.01em;
  color: #fff;
}

/* 玻璃拟态图标 */
.glass-ico {
  position: relative;
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28), 0 12px 26px -12px rgba(90, 194, 223, 0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.glass-ico svg {
  width: 26px;
  height: 26px;
  stroke: #9fe3f5;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 2px 6px rgba(90, 194, 223, 0.5));
}

.glass-ico::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 16px;
  background: radial-gradient(60px 40px at 30% 18%, rgba(255, 255, 255, 0.28), transparent 70%);
  pointer-events: none;
}

.glass-ico.lt {
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.9), rgba(235, 244, 248, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: inset 0 1px 0 #fff, 0 12px 26px -14px rgba(23, 27, 38, 0.35);
}

.glass-ico.lt svg {
  stroke: #2f9db8;
  filter: drop-shadow(0 2px 5px rgba(90, 194, 223, 0.35));
}

.section.dark {
  background:
    radial-gradient(760px 420px at 8% -10%, rgba(90, 194, 223, 0.16), transparent 60%),
    radial-gradient(540px 340px at 96% 112%, rgba(90, 194, 223, 0.09), transparent 60%),
    var(--ink);
}

.section.dark::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
  opacity: 0.05;
  mix-blend-mode: overlay;
}

.section.dark>.container {
  z-index: 1;
}

/* ============ 响应式 ============ */
@media (max-width: 1000px) {
  .site-nav {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .menu-btn {
    display: flex;
  }

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

  .hero-inner,
  .page-hero .hero-inner,
  .about-brief {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .card-row,
  .card-row.col-4,
  .steps,
  .bignum-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    gap: 10px;
  }

  .step::after {
    display: none;
  }

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

  .ghost-word {
    font-size: clamp(34px, 8.5vw, 64px);
  }
}

@media (max-width: 620px) {
  .section {
    padding: 64px 0;
  }

  .card-row,
  .card-row.col-4,
  .steps,
  .bignum-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .cta-band {
    padding: 36px 28px;
  }

  .section-tight {
    padding: 44px 0;
  }

  .section-flush {
    padding-top: 0;
  }
}