:root {
  --yitiku-blue: #2878f6;
  --yitiku-blue-bright: #5c96ff;
  --yitiku-blue-deep: #0b2e6d;
  --yitiku-blue-night: #061c46;
  --yitiku-blue-soft: #eaf2ff;
  --yitiku-gold: #ffb82e;
  --yitiku-cloud: #f5f8ff;
  --yitiku-paper: #ffffff;
  --yitiku-ink: #17345f;
  --yitiku-muted: #61769a;
  --yitiku-line: rgba(40, 120, 246, 0.2);
  --nav-height: 80px;
  color: var(--yitiku-ink);
  background: var(--yitiku-cloud);
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; background: var(--yitiku-cloud); }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
button { color: inherit; }

.site-nav {
  position: fixed;
  z-index: 50;
  inset: 0 0 auto;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 4vw, 68px) 0 clamp(24px, 8vw, 138px);
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(4, 24, 64, 0.74);
  backdrop-filter: blur(18px) saturate(125%);
  isolation: isolate;
}
.site-nav > * { position: relative; z-index: 1; }

.brand { position: relative; display: inline-flex; align-items: center; gap: 16px; min-width: 0; background: transparent; }
.site-nav .brand {
  height: 40px;
  padding: 2px 6px;
  border: 1px solid rgba(190, 207, 235, 0.9);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 6px 18px rgba(2, 18, 48, 0.22);
}
.brand-logo {
  width: 164px;
  height: 54px;
  object-fit: contain;
  flex: none;
  filter: drop-shadow(0 0 16px rgba(92, 150, 255, 0.46));
}
.site-nav .brand-logo { width: 104px; height: 34px; filter: none; }
.brand-copy { display: grid; gap: 3px; }
.brand-copy strong { font-size: 13px; letter-spacing: 0.04em; }
.brand-copy small { color: rgba(255, 255, 255, 0.58); font: 9px/1.2 Arial, sans-serif; letter-spacing: 0.13em; }

.nav-actions { display: flex; align-items: center; gap: 9px; }
.nav-button,
.account-trigger {
  height: 40px;
  font: 13px "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  color: #fff;
  background: rgba(255, 255, 255, 0.07);
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}
.nav-button:hover,
.account-trigger:hover { border-color: rgba(255, 255, 255, 0.72); background: rgba(255, 255, 255, 0.14); transform: translateY(-1px); }
.nav-points { display: inline-flex; align-items: center; gap: 9px; white-space: nowrap; }
.point-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--yitiku-gold); box-shadow: 0 0 0 5px rgba(255, 184, 46, 0.15); }
.account-menu { position: relative; }
.account-trigger { display: flex; align-items: center; gap: 8px; }
.account-popover {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 150px;
  padding: 8px;
  border: 1px solid var(--yitiku-line);
  border-radius: 10px;
  color: var(--yitiku-ink);
  background: #fff;
  box-shadow: 0 20px 60px rgba(10, 45, 107, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-5px);
  transition: 180ms ease;
}
.account-menu.open .account-popover { opacity: 1; visibility: visible; transform: none; }
.account-popover a,
.account-popover button { display: block; width: 100%; padding: 10px; border: 0; border-radius: 7px; text-align: left; background: none; cursor: pointer; }
.account-popover a:hover,
.account-popover button:hover { color: var(--yitiku-blue-deep); background: var(--yitiku-blue-soft); }

.hero {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  color: #fff;
  background: var(--yitiku-blue-night);
}
.hero-image {
  position: absolute;
  inset: 0;
  background: url("/assets/yitiku-brand-hero.png") center center / cover no-repeat;
  transform: scale(1.015);
  animation: hero-breathe 18s ease-in-out infinite alternate;
}
.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(3, 19, 52, 0.42) 0%, rgba(3, 20, 55, 0.16) 43%, rgba(3, 20, 55, 0) 69%),
    linear-gradient(0deg, rgba(3, 18, 48, 0.52) 0%, transparent 32%);
}
.hero-content {
  position: relative;
  z-index: 2;
  min-height: 100svh;
  width: min(1420px, 100%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-height) + 46px) clamp(24px, 8vw, 138px) 116px;
}
.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 13px;
  margin: 0 0 24px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 12px;
  letter-spacing: 0.12em;
  opacity: 0;
  animation: hero-rise 700ms 140ms ease forwards;
}
.hero-eyebrow::before { content: ""; width: 34px; height: 2px; background: var(--yitiku-gold); }
.hero-eyebrow span { color: var(--yitiku-gold); font: 700 11px Arial, sans-serif; letter-spacing: 0.2em; }
.hero h1 { margin: 0; font-weight: 800; letter-spacing: -0.055em; }
.hero-brand-name {
  display: block;
  width: max-content;
  font-size: clamp(70px, 8.4vw, 126px);
  line-height: 0.98;
  opacity: 0;
  animation: hero-rise 850ms 240ms ease forwards;
}
.hero-promise {
  display: block;
  margin-top: 19px;
  font-size: clamp(34px, 4.3vw, 64px);
  line-height: 1.14;
  letter-spacing: -0.05em;
  opacity: 0;
  animation: hero-rise 850ms 350ms ease forwards;
}
.hero-summary {
  margin: 26px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 15px;
  line-height: 1.85;
  opacity: 0;
  animation: hero-rise 750ms 470ms ease forwards;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 34px;
  opacity: 0;
  animation: hero-rise 750ms 580ms ease forwards;
}
.primary-action {
  min-width: 250px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  padding: 17px 19px;
  border-radius: 9px;
  color: var(--yitiku-blue-night);
  background: var(--yitiku-gold);
  font-size: 14px;
  font-weight: 800;
  box-shadow: 0 12px 38px rgba(255, 184, 46, 0.18);
  transition: background 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}
.primary-action:hover { background: #ffd16d; box-shadow: 0 16px 42px rgba(255, 184, 46, 0.26); transform: translateY(-2px); }
.primary-action span { font-size: 18px; }
.text-action {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.42);
  color: #fff;
  background: none;
  cursor: pointer;
  transition: border-color 180ms ease, gap 180ms ease;
}
.text-action:hover { gap: 16px; border-color: #fff; }
.text-action span { color: var(--yitiku-gold); }

.hero-path {
  position: absolute;
  z-index: 3;
  right: clamp(24px, 5vw, 82px);
  bottom: 42px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.58);
  font-size: 11px;
  letter-spacing: 0.12em;
}
.hero-path i { width: clamp(18px, 2.4vw, 38px); height: 1px; background: rgba(255, 255, 255, 0.25); }
.hero-path span:last-child { color: var(--yitiku-gold); }
.scroll-cue {
  position: absolute;
  z-index: 3;
  left: clamp(24px, 8vw, 138px);
  bottom: 42px;
  display: flex;
  align-items: center;
  gap: 15px;
  color: rgba(255, 255, 255, 0.58);
  font-size: 10px;
  letter-spacing: 0.16em;
}
.scroll-cue i { position: relative; display: block; width: 70px; height: 1px; overflow: hidden; background: rgba(255, 255, 255, 0.26); }
.scroll-cue i::after { content: ""; position: absolute; inset: 0; background: var(--yitiku-gold); transform: translateX(-100%); animation: scan 2.6s ease-in-out infinite; }

.workbench { padding: clamp(78px, 8vw, 118px) clamp(20px, 6vw, 96px) clamp(96px, 11vw, 164px); }

.module-groups { display: block; }
.module-group { padding-top: clamp(72px, 8vw, 118px); }
.module-group:first-child { padding-top: 0; }
.module-group + .module-group { margin-top: clamp(30px, 4vw, 60px); }
.module-group-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.42fr);
  align-items: end;
  gap: 40px;
  margin-bottom: 28px;
}
.module-group-kicker { margin: 0 0 14px; color: var(--yitiku-blue); font: 700 10px Arial, sans-serif; letter-spacing: 0.2em; }
.module-group-heading h2 { margin: 0; color: var(--yitiku-blue-deep); font-size: clamp(30px, 3.5vw, 50px); letter-spacing: -0.05em; }
.module-group-heading > p { margin: 0 0 3px; color: var(--yitiku-muted); font-size: 13px; line-height: 1.85; }
.module-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--yitiku-blue); border-left: 1px solid var(--yitiku-line); }
.module-card {
  position: relative;
  min-height: 286px;
  display: flex;
  flex-direction: column;
  padding: 25px;
  overflow: hidden;
  border-right: 1px solid var(--yitiku-line);
  border-bottom: 1px solid var(--yitiku-line);
  background: rgba(255, 255, 255, 0.52);
  cursor: pointer;
  transition: color 240ms ease, background 240ms ease, transform 240ms ease, box-shadow 240ms ease;
}
.module-card::before {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 4px;
  background: var(--yitiku-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 260ms ease;
}
.module-card:hover { z-index: 2; color: #fff; background: var(--yitiku-blue-deep); box-shadow: 0 24px 50px rgba(11, 46, 109, 0.2); transform: translateY(-4px); }
.module-card:hover::before { transform: scaleX(1); }
.module-card[aria-disabled="true"] { cursor: not-allowed; opacity: 0.58; }
.module-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.module-number { color: var(--yitiku-blue); font: 700 11px Arial, sans-serif; letter-spacing: 0.14em; }
.module-cost { padding: 5px 8px; border-radius: 5px; color: #8a5900; background: rgba(255, 184, 46, 0.18); font-size: 10px; white-space: nowrap; }
.module-title { margin: auto 0 10px; color: var(--yitiku-blue-deep); font-size: 23px; letter-spacing: -0.04em; }
.module-label { margin: 0 0 9px; color: var(--yitiku-blue); font-size: 13px; font-weight: 800; }
.module-description { min-height: 46px; margin: 0; color: var(--yitiku-muted); font-size: 12px; line-height: 1.75; }
.module-enter { display: flex; align-items: center; justify-content: space-between; margin-top: 21px; font-size: 11px; letter-spacing: 0.08em; }
.module-enter b { color: var(--yitiku-blue); font-size: 20px; font-weight: 400; transition: transform 180ms ease; }
.module-card:hover .module-number,
.module-card:hover .module-label,
.module-card:hover .module-enter b { color: var(--yitiku-gold); }
.module-card:hover .module-title { color: #fff; }
.module-card:hover .module-description { color: rgba(255, 255, 255, 0.68); }
.module-card:hover .module-enter b { transform: translate(4px, -3px); }
.module-loading { padding: 36px 0; color: var(--yitiku-muted); }

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 46px clamp(20px, 6vw, 96px);
  color: #fff;
  background: var(--yitiku-blue-night);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-brand .brand-logo { width: 142px; height: 47px; }
footer p { color: rgba(255, 255, 255, 0.42); font: 11px Arial, sans-serif; letter-spacing: 0.08em; }

.modal {
  width: min(480px, calc(100vw - 30px));
  padding: 38px;
  border: 1px solid var(--yitiku-line);
  border-radius: 16px;
  color: var(--yitiku-ink);
  background: var(--yitiku-cloud);
  box-shadow: 0 36px 100px rgba(3, 24, 69, 0.42);
}
.modal::backdrop { background: rgba(3, 18, 48, 0.74); backdrop-filter: blur(10px); }
.modal-close { position: absolute; right: 18px; top: 14px; width: 34px; height: 34px; border: 0; border-radius: 50%; color: var(--yitiku-muted); background: none; font-size: 26px; cursor: pointer; }
.modal-close:hover { color: var(--yitiku-blue); background: var(--yitiku-blue-soft); }
.modal-heading p { margin: 0 0 12px; color: var(--yitiku-blue); font: 700 10px Arial, sans-serif; letter-spacing: 0.2em; }
.modal-heading h2 { margin: 0 0 10px; color: var(--yitiku-blue-deep); font-size: 30px; letter-spacing: -0.04em; }
.modal-heading span { color: var(--yitiku-muted); font-size: 13px; line-height: 1.7; }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; margin: 28px 0 22px; border-bottom: 1px solid var(--yitiku-line); }
.auth-tabs button { padding: 12px; border: 0; border-bottom: 3px solid transparent; background: none; cursor: pointer; }
.auth-tabs button.active { border-bottom-color: var(--yitiku-blue); color: var(--yitiku-blue-deep); font-weight: 800; }
.auth-form,
.points-form { display: grid; gap: 16px; }
.auth-form label,
.points-form label { display: grid; gap: 7px; color: var(--yitiku-blue-deep); font-size: 12px; font-weight: 800; }
.auth-form input,
.points-form input { width: 100%; height: 49px; padding: 0 14px; border: 1px solid #c7d6ee; border-radius: 8px; background: #fff; outline: 0; }
.auth-form input:focus,
.points-form input:focus { border-color: var(--yitiku-blue); box-shadow: 0 0 0 4px rgba(40, 120, 246, 0.12); }
.modal-primary { height: 49px; border: 0; border-radius: 8px; color: #fff; background: var(--yitiku-blue); font-weight: 800; cursor: pointer; box-shadow: 0 10px 24px rgba(40, 120, 246, 0.2); }
.modal-primary:hover { background: var(--yitiku-blue-deep); }
.form-message { min-height: 20px; margin: 0; color: #b83535; font-size: 12px; }
.form-message.success { color: #14795c; }
.purchase-divider { display: flex; align-items: center; gap: 12px; margin: 25px 0 14px; color: var(--yitiku-muted); font-size: 11px; }
.purchase-divider::before,
.purchase-divider::after { content: ""; flex: 1; height: 1px; background: var(--yitiku-line); }
.purchase-link { display: flex; align-items: center; justify-content: space-between; padding: 15px; border: 1px solid var(--yitiku-blue-deep); border-radius: 8px; color: var(--yitiku-blue-deep); font-weight: 800; }
.purchase-link:hover { color: #fff; background: var(--yitiku-blue-deep); }

:focus-visible { outline: 3px solid var(--yitiku-gold); outline-offset: 3px; }
@keyframes scan { 0%, 15% { transform: translateX(-100%); } 65%, 100% { transform: translateX(100%); } }
@keyframes hero-breathe { from { transform: scale(1.015); } to { transform: scale(1.055); } }
@keyframes hero-rise { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }

@media (max-width: 1120px) {
  .module-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 860px) {
  .hero-image { background-position: 58% center; }
  .module-group-heading { grid-template-columns: 1fr; gap: 14px; }
  .module-group-heading > p { max-width: 560px; }
  .module-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 660px) {
  :root { --nav-height: 66px; }
  .site-nav { padding: 0 13px 0 21px; }
  .brand { gap: 8px; }
  .site-nav .brand { height: 36px; padding: 3px 5px; }
  .site-nav .brand-logo { width: 88px; height: 28px; }
  .brand-copy { display: none; }
  .nav-actions { gap: 6px; }
  .nav-button,
  .account-trigger { height: 36px; padding: 0 10px; font-size: 12px; }
  .nav-auth { display: none; }
  .account-name { display: none; }
  .account-trigger::before { content: "账户"; }
  .hero-image { background-position: 64% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(3, 18, 50, 0.84), rgba(3, 20, 55, 0.32)), linear-gradient(0deg, rgba(3, 18, 48, 0.62), transparent 52%); }
  .hero-content { justify-content: flex-end; padding: calc(var(--nav-height) + 44px) 21px 118px; }
  .hero-eyebrow { margin-bottom: 19px; font-size: 10px; }
  .hero-brand-name { font-size: clamp(62px, 21vw, 88px); }
  .hero-promise { margin-top: 15px; font-size: clamp(34px, 10.5vw, 48px); line-height: 1.12; }
  .hero-summary { margin-top: 22px; font-size: 13px; }
  .hero-summary br { display: none; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 10px; margin-top: 28px; }
  .primary-action { min-width: 0; }
  .text-action { align-self: flex-start; }
  .hero-path { display: none; }
  .scroll-cue { left: 21px; bottom: 34px; }
  .workbench { padding: 78px 15px 90px; }
  .module-group { padding-top: 64px; }
  .module-grid { grid-template-columns: 1fr; }
  .module-card { min-height: 260px; }
  footer { align-items: flex-start; flex-direction: column; gap: 24px; padding-block: 40px; }
  .modal { padding: 34px 22px 25px; border-radius: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .hero-eyebrow,
  .hero-brand-name,
  .hero-promise,
  .hero-summary,
  .hero-actions { opacity: 1; }
}