/* Arvea — 页面样式
   结构：公告条 / 导航（含下拉与抽屉）/ 首屏（含动态场）/ 数字 / 问题 /
        服务 / 流程 / 原则 / FAQ / CTA / 页脚 / 子页 / 动效工具 */

/* ---------- 公告条 ---------- */
.announce {
  background: linear-gradient(90deg, #003e8f 0%, #0071e3 55%, #1f8ff5 100%);
  color: #fff;
  font-size: 0.8125rem;
  letter-spacing: 0;
}

.announce-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.35rem 2.5rem;
  text-align: center;
}

.announce a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: rgb(255 255 255 / 0.45);
}

.announce a:hover {
  text-decoration-color: #fff;
}

.announce-close {
  position: absolute;
  right: 0;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  color: #fff;
  font-size: 1rem;
  line-height: 1;
  opacity: 0.75;
  cursor: pointer;
}

.announce-close:hover {
  opacity: 1;
  background: rgb(255 255 255 / 0.12);
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgb(251 251 253 / 0.72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line-soft);
  transition: box-shadow var(--dur-base) var(--ease), background var(--dur-base) var(--ease);
}

.nav.is-scrolled {
  background: rgb(251 251 253 / 0.86);
  box-shadow: 0 18px 40px -32px rgb(6 12 30 / 0.5);
}

.nav-inner {
  position: relative;
  display: flex;
  align-items: center;
  height: 3.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--ink);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 26px;
  height: 26px;
  border-radius: 7px;
}

.nav-links {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.15rem;
  margin: 0;
}

.nav-item {
  position: relative;
}

.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.7rem;
  border: 0;
  border-radius: 8px;
  background: none;
  color: var(--ink-2);
  font-size: 0.8125rem;
  letter-spacing: 0;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}

.nav-trigger:hover,
.nav-item.is-open .nav-trigger {
  color: var(--ink);
  background: rgb(0 0 0 / 0.04);
}

.nav-trigger::after {
  content: "";
  width: 5px;
  height: 5px;
  margin-top: -2px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.5;
  transition: transform var(--dur-fast) var(--ease);
}

.nav-item.is-open .nav-trigger::after {
  transform: rotate(-135deg);
  margin-top: 2px;
}

.nav-panel {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  z-index: 120;
  width: min(30rem, 82vw);
  padding: 0.5rem;
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 36px 70px -24px rgb(6 12 30 / 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 8px);
  transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease),
    visibility var(--dur-base);
}

.nav-item:last-child .nav-panel {
  left: auto;
  right: 0;
  transform: translateY(8px);
}

.nav-item.is-open .nav-panel {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.nav-item:last-child.is-open .nav-panel {
  transform: translateY(0);
}

.nav-panel a {
  display: grid;
  gap: 0.1rem;
  padding: 0.6rem 0.75rem;
  border-radius: 12px;
  color: var(--ink);
}

.nav-panel a:hover {
  background: var(--bg-alt);
  text-decoration: none;
}

.nav-panel strong {
  font-size: 0.875rem;
  font-weight: 600;
}

.nav-panel span {
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0;
}

.nav-panel .soon {
  display: inline-block;
  margin-left: 0.4rem;
  padding: 0.05rem 0.35rem;
  border-radius: 999px;
  background: var(--bg-alt);
  color: var(--muted);
  font-size: 0.625rem;
  vertical-align: 1px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-left: auto;
}

.nav-cta {
  padding: 0.4rem 0.95rem;
  border-radius: var(--radius-pill);
  background: var(--blue);
  color: #fff;
  font-size: 0.8125rem;
  letter-spacing: 0;
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--blue-hover);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 0;
  background: none;
  color: var(--ink);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1px;
  margin: 4px auto;
  background: currentColor;
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.scroll-progress {
  position: absolute;
  inset-inline: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
}

.scroll-progress span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--blue-bright));
  transform: scaleX(0);
  transform-origin: left;
}

/* 移动端抽屉 */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 110;
  padding: 1rem var(--gutter) 3rem;
  background: rgb(251 251 253 / 0.98);
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
  overflow-y: auto;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease);
}

.mobile-menu[hidden] {
  display: none;
}

.mobile-menu.is-open {
  opacity: 1;
  transform: none;
}

.mobile-menu-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.mobile-menu-close {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--bg-alt);
  color: var(--ink);
  font-size: 1rem;
}

.mobile-menu nav {
  display: grid;
  gap: 2rem;
  margin-top: 1.5rem;
}

.mobile-menu h4 {
  margin-bottom: 0.6rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.mobile-menu ul {
  display: grid;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.mobile-menu li a {
  display: block;
  padding: 0.45rem 0;
  color: var(--ink);
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.mobile-menu li a:hover {
  text-decoration: none;
}

.mobile-menu .brand {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0;
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
}

.mobile-menu .brand img {
  width: 26px;
  height: 26px;
}

.mobile-menu .btn {
  margin-top: 2rem;
  width: 100%;
}

body.menu-open {
  overflow: hidden;
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(4rem, 7.5vw, 6.5rem);
  padding-bottom: 0;
  background:
    radial-gradient(70% 55% at 50% 0%, #e9f3fe 0%, rgb(233 243 254 / 0) 70%),
    linear-gradient(180deg, #f4f9ff 0%, #fbfbfd 62%);
}

.hero-copy {
  position: relative;
  max-width: 64rem;
  margin-inline: auto;
  text-align: center;
}

.hero h1 {
  margin-top: 1.2rem;
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.hero h1 .line {
  display: block;
}

.hero h1 .line > span {
  display: block;
  background-image:
    radial-gradient(circle 190px at var(--hx, -700px) var(--hy, -700px), rgb(31 143 255 / 0.9), transparent 68%),
    linear-gradient(#1d1d1f, #1d1d1f);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .lede {
  max-width: 40rem;
  margin: 1.25rem auto 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  align-items: center;
  justify-content: center;
  margin-top: 1.8rem;
}

.trust {
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: var(--text-xs);
  letter-spacing: 0;
}

/* 动态场：等高线地形，跟随指针起伏 */
.hero-field {
  position: relative;
  width: 100%;
  height: clamp(260px, 30vw, 420px);
  margin-top: clamp(1rem, 2vw, 1.75rem);
  mask-image: linear-gradient(180deg, transparent 0%, #000 12%, #000 88%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 12%, #000 88%, transparent 100%);
}

.hero-field canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.hero-field::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 34%;
  width: min(1000px, 92vw);
  height: 64%;
  transform: translate(-50%, -50%);
  background: radial-gradient(closest-side, rgb(41 151 255 / 0.24), transparent 72%);
  filter: blur(24px);
  pointer-events: none;
}

.hero-field::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='0.35'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

/* ---------- 数字 ---------- */
.stats {
  padding-block: clamp(1.5rem, 3vw, 2.25rem);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}

.stat .value {
  display: block;
  font-size: var(--text-stat);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.035em;
  font-variant-numeric: tabular-nums;
}

.stat .label {
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.9375rem;
  max-width: 16em;
}

/* ---------- 段落头 ---------- */
.section-head {
  max-width: 52rem;
  margin-bottom: clamp(1.5rem, 3vw, 2rem);
}

.section-head h2 {
  margin-top: 0.9rem;
}

.section-head .lede {
  margin-top: 1rem;
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

/* ---------- 问题（深色） ---------- */
.problem {
  background: var(--night);
  color: var(--night-text);
}

.problem-head {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: end;
}

.problem h2 {
  color: #fff;
}

.problem .big {
  margin-top: 1.2rem;
  color: var(--night-muted);
  font-size: clamp(1.25rem, 2.1vw, 1.75rem);
  line-height: 1.5;
  letter-spacing: -0.015em;
}

.problem-head p + p {
  margin-top: 1rem;
}

.problem-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(3rem, 6vw, 4.5rem);
  border-top: 1px solid var(--night-line);
}

.problem-item {
  padding: 2rem 2.5rem 0 0;
  border-right: 1px solid var(--night-line);
}

.problem-item + .problem-item {
  padding-left: 2.5rem;
}

.problem-item:last-child {
  border-right: 0;
}

.problem-item h3 {
  color: #fff;
  font-size: 1.0625rem;
}

.problem-item p {
  margin-top: 0.5rem;
  color: var(--night-muted);
  font-size: 0.9375rem;
}

/* ---------- 服务 ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.service-card {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 1.6rem 1.5rem 1.35rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--card);
  transition: transform var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease),
    border-color var(--dur-base) var(--ease);
}

.service-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(240px circle at var(--mx, 50%) var(--my, 0%), rgb(0 113 227 / 0.1), transparent 68%);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease);
  pointer-events: none;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: rgb(0 113 227 / 0.18);
  box-shadow: var(--shadow-soft);
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon {
  position: relative;
  color: var(--blue);
}

.service-card h3 {
  position: relative;
  margin-top: 1.35rem;
}

.service-card p {
  position: relative;
  margin-top: 0.6rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

.service-card .link-arrow {
  position: relative;
  margin-top: 1.6rem;
  font-size: 0.875rem;
}

/* ---------- 流程 ---------- */
.process {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.process::before,
.process::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: calc(75% + 1.3125rem);
  height: 1px;
}

.process::after {
  background: var(--line);
  z-index: 0;
}

.process::before {
  background: linear-gradient(90deg, var(--blue), var(--blue-bright));
  transform: scaleX(var(--fill, 0));
  transform-origin: left;
  transition: transform 480ms var(--ease);
  z-index: 1;
}

.step {
  position: relative;
  padding-top: 1.35rem;
}

.step::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
  transition: transform var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}

.step:hover::before {
  transform: scale(1.9);
  box-shadow: 0 0 0 5px rgb(0 113 227 / 0.14);
}

.step .num {
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  transition: opacity var(--dur-fast) var(--ease);
}

.step h3 {
  margin-top: 0.45rem;
  font-size: 1.0625rem;
  transition: color var(--dur-fast) var(--ease);
}

.step:hover h3 {
  color: var(--blue);
}

.step p {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.step .dur {
  display: inline-block;
  margin-top: 0.85rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0;
}

/* ---------- 原则（深色） ---------- */
.why {
  background: radial-gradient(95% 80% at 72% 0%, #0d1c36 0%, #070a12 58%);
  color: var(--night-text);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2.75rem 4.5rem;
}

.why-item {
  padding-top: 1.5rem;
  border-top: 1px solid var(--night-line);
}

.why-item h3 {
  color: #fff;
  font-size: 1.25rem;
}

.why-item p {
  margin-top: 0.55rem;
  color: var(--night-muted);
  font-size: 0.9375rem;
  max-width: 30em;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 50rem;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: 100%;
  padding: 1.35rem 0;
  border: 0;
  background: none;
  color: var(--ink);
  font-size: 1.0625rem;
  font-weight: 500;
  text-align: left;
  letter-spacing: -0.01em;
  cursor: pointer;
}

.faq-q:hover {
  color: var(--blue);
}

.faq-icon {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform var(--dur-base) var(--ease), opacity var(--dur-base) var(--ease);
}

.faq-icon::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 1.5px;
}

.faq-icon::after {
  top: 0;
  left: 6px;
  width: 1.5px;
  height: 14px;
}

.faq-item.is-open .faq-icon::after {
  transform: scaleY(0);
}

.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-slow) var(--ease);
}

.faq-a > div {
  overflow: hidden;
}

.faq-item.is-open .faq-a {
  grid-template-rows: 1fr;
}

.faq-a p {
  padding: 0 3rem 1.4rem 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

/* ---------- CTA ---------- */
.cta {
  padding-block: clamp(4.5rem, 10vw, 8rem);
  background: radial-gradient(120% 150% at 50% 0%, #0c2a55 0%, #070a12 58%);
  color: #fff;
  text-align: center;
}

.cta h2 {
  max-width: 22em;
  margin-inline: auto;
  color: #fff;
}

.cta .lede {
  max-width: 36rem;
  margin: 1.1rem auto 0;
  color: var(--night-muted);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: center;
  margin-top: 2rem;
}

.cta .link-arrow {
  color: var(--blue-bright);
}

/* ---------- 页脚 ---------- */
.footer {
  padding-block: 3.5rem 2rem;
  background: var(--bg-alt);
  color: var(--muted);
  font-size: 0.8125rem;
  letter-spacing: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 2rem;
}

.footer-brand .footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--ink);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.footer-brand .footer-logo:hover {
  text-decoration: none;
}

.footer-brand p {
  max-width: 16em;
  margin-top: 0.7rem;
}

.footer h4 {
  margin-bottom: 0.9rem;
  color: var(--ink);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0;
}

.footer ul {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer a {
  color: var(--muted);
}

.footer a:hover {
  color: var(--ink);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
}

/* ---------- 子页 ---------- */
.page-hero {
  padding: clamp(3rem, 6vw, 4.5rem) 0 clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line-soft);
}

.page-hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.25rem);
  max-width: 16em;
}

.page-hero .lede {
  max-width: 40rem;
  margin-top: 1.4rem;
}

/* ---------- 服务详情 ---------- */
.svc {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2rem, 6vw, 5rem);
  padding-block: clamp(2rem, 3.5vw, 2.75rem);
  border-top: 1px solid var(--line);
}

.svc:first-of-type {
  border-top: 0;
}

.svc .num {
  display: block;
  margin-bottom: 1rem;
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.svc h2 {
  font-size: clamp(1.75rem, 3vw, 2.375rem);
}

.svc .fit {
  margin-top: 0.8rem;
  color: var(--muted);
}

.svc-meta {
  display: grid;
  gap: 0;
  align-content: start;
}

.meta-row {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line-soft);
  font-size: 0.9375rem;
}

.meta-row:first-child {
  border-top: 0;
  padding-top: 0;
}

.meta-row dt {
  color: var(--muted);
  font-size: 0.8125rem;
  letter-spacing: 0;
}

.meta-row dd {
  margin: 0;
  color: var(--ink-2);
}

/* ---------- 关于 ---------- */
.belief {
  max-width: 50rem;
}

.belief p {
  font-size: clamp(1.25rem, 2vw, 1.625rem);
  line-height: 1.6;
  letter-spacing: -0.015em;
}

.belief p + p {
  margin-top: 1.5rem;
  color: var(--ink-2);
}

.etymology {
  padding-block: clamp(4.5rem, 10vw, 8rem);
  background: var(--night);
  color: var(--night-text);
  text-align: center;
}

.etymology .word {
  font-size: clamp(3.5rem, 11vw, 8rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.05em;
}

.etymology .phon {
  margin-top: 0.75rem;
  color: var(--night-muted);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

.etymology p {
  max-width: 38rem;
  margin: 2.25rem auto 0;
  color: var(--night-muted);
}

.notdo {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.notdo li {
  display: flex;
  gap: 0.9rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
}

.notdo li::before {
  content: "×";
  color: var(--blue);
  font-weight: 600;
  line-height: 1.4;
}

.team {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.member {
  padding-top: 1.25rem;
  border-top: 2px solid var(--ink);
}

.member .role {
  font-size: 1.125rem;
  font-weight: 600;
}

.member p {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

/* ---------- 动效与交互工具 ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 900ms var(--ease), transform 900ms var(--ease);
  transition-delay: var(--d, 0ms);
}

.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 2rem;
  z-index: 200;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-pill);
  background: rgb(29 29 31 / 0.92);
  color: #fff;
  font-size: 0.8125rem;
  letter-spacing: 0;
  opacity: 0;
  transform: translate(-50%, 12px);
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease);
}

.toast.is-show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .problem-head {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    align-items: start;
  }

  .why-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .svc {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .services-grid,
  .process,
  .problem-list,
  .team {
    grid-template-columns: 1fr;
  }

  .problem-item,
  .problem-item + .problem-item {
    padding: 1.5rem 0;
    border-right: 0;
    border-bottom: 1px solid var(--night-line);
  }

  .problem-item:last-child {
    border-bottom: 0;
  }

  .step {
    padding-bottom: 1.25rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .hero-field {
    height: clamp(260px, 52vw, 380px);
  }
}

@media (max-width: 560px) {
  .hero-actions {
    gap: 1rem;
  }

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

  .faq-a p {
    padding-right: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .nav-panel,
  .mobile-menu,
  .faq-a,
  .toast {
    transition: none;
  }
}

/* ---------- 首屏地形入场转场 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .hero-field {
    animation: field-in 1100ms var(--ease) 120ms both;
  }

  @keyframes field-in {
    from {
      opacity: 0;
      transform: translateY(18px) scale(0.995);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  .process::before {
    transition: none;
  }
}

.nowrap {
  white-space: nowrap;
}

@media (max-width: 560px) {
  .announce {
    font-size: 0.75rem;
  }

  .announce-inner {
    padding-inline: 2rem;
  }
}

/* ---------- 首屏标语：逐行升起 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .hero-copy > :not(h1) {
    animation: hero-in 900ms var(--ease) both;
  }

  .hero h1 {
    animation: hero-in 900ms var(--ease) 60ms both;
  }

  .hero-copy > :nth-child(1) {
    animation-delay: 0ms;
  }

  .hero-copy > :nth-child(3) {
    animation-delay: 280ms;
  }

  .hero-copy > :nth-child(4) {
    animation-delay: 360ms;
  }

  .hero-copy > :nth-child(5) {
    animation-delay: 440ms;
  }


}

@keyframes hero-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}



.hero .lede {
  margin-top: 1.7rem;
}

.hero-actions {
  margin-top: 2rem;
}

/* ---------- 语言切换 ---------- */
.lang-toggle {
  padding: 0.35rem 0.55rem;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}

.lang-toggle:hover {
  color: var(--ink);
  background: rgb(0 0 0 / 0.05);
}

.mobile-menu-tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ---------- 分区各自的互动 ---------- */

/* 1. 数字：悬停时上浮、变蓝、下划线生长 */
.stat {
  position: relative;
  padding-bottom: 1.1rem;
}

.stat::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 520ms var(--ease);
}

.stat:hover::after {
  transform: scaleX(1);
}

.stat .value {
  transition: transform 420ms var(--ease), color 420ms var(--ease);
}

.stat:hover .value {
  transform: translateY(-3px);
  color: var(--blue);
}

/* 2. 问题区：跟随指针的暗部光斑 */
.problem {
  position: relative;
}

.problem::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(340px circle at var(--px, 50%) var(--py, 50%), rgb(41 151 255 / 0.16), transparent 68%);
  opacity: 0;
  transition: opacity 420ms var(--ease);
  pointer-events: none;
}

.problem:hover::before {
  opacity: 1;
}

/* 3. 服务卡：指针倾斜 + 光斑 */
.services-grid {
  perspective: 1000px;
}

.service-card {
  transform-style: preserve-3d;
  will-change: transform;
}

/* 4. 原则区：悬停时顶线从左画到右 */
.why-item {
  position: relative;
}

.why-item::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--blue-bright);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 460ms var(--ease);
}

.why-item:hover::after {
  transform: scaleX(1);
}

/* 5. CTA：跟随指针的光晕 */
.cta {
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px circle at var(--cx, 50%) var(--cy, 30%), rgb(41 151 255 / 0.22), transparent 66%);
  opacity: 0.9;
  pointer-events: none;
}

.cta .container {
  position: relative;
}

/* 6. 滚动进入时更柔和的焦点变化 */
.js .reveal {
  filter: blur(5px);
  transition: opacity 900ms var(--ease), transform 900ms var(--ease), filter 900ms var(--ease);
}

.js .reveal.is-in {
  filter: blur(0);
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal {
    filter: none;
  }

  .stat::after,
  .why-item::after,
  .stat .value {
    transition: none;
  }
}

/* 锚点跳转避开吸顶导航 */
[id] {
  scroll-margin-top: calc(var(--nav-h) + 1.25rem);
}

/* ---------- 通用光标光晕（浅色分区） ---------- */
.glow-zone {
  position: relative;
}

.glow-zone::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(360px circle at var(--px, 50%) var(--py, 50%), rgb(0 113 227 / 0.07), transparent 70%);
  opacity: 0;
  transition: opacity 450ms var(--ease);
  pointer-events: none;
}

.glow-zone:hover::before {
  opacity: 1;
}

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

@media (prefers-reduced-motion: reduce) {
  .glow-zone::before {
    transition: none;
  }
}

@media (max-width: 900px) {
  .process::before {
    display: none;
  }
}