:root {
  --blue: #2b6cf6;
  --blue-dark: #1749b8;
  --blue-soft: #eaf2ff;
  --ink: #10213d;
  --muted: #60708b;
  --line: #dce7f7;
  --shadow: 0 24px 70px rgba(37, 83, 166, .14);
  --shadow-soft: 0 14px 38px rgba(37, 83, 166, .1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
.container { width: min(100% - 48px, 1180px); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 100; padding: 10px 16px; color: white; background: var(--blue); border-radius: 10px; }
.skip-link:focus { top: 16px; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(220,231,247,.78); background: rgba(255,255,255,.88); backdrop-filter: blur(18px); }
.nav-shell { min-height: 76px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 30px; }
.brand { width: max-content; display: inline-flex; align-items: center; gap: 12px; font-size: 1.12rem; font-weight: 850; letter-spacing: -.02em; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; flex: 0 0 auto; }
.brand-mark img { width: 100%; height: 100%; display: block; object-fit: contain; }
.site-header nav { display: flex; align-items: center; gap: 34px; color: #536783; font-size: .92rem; font-weight: 700; }
.site-header nav a { position: relative; padding: 27px 0 24px; }
.site-header nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 18px; height: 2px; background: var(--blue); transition: right .2s ease; }
.site-header nav a:hover::after { right: 0; }
.header-button { justify-self: end; padding: 11px 20px; color: var(--blue-dark); border: 1px solid #bcd2ff; border-radius: 999px; background: #f8fbff; font-size: .87rem; font-weight: 800; }

.hero-section { position: relative; overflow: hidden; padding: 88px 0 58px; background: radial-gradient(circle at 74% 22%, rgba(107,183,255,.3), transparent 31%), linear-gradient(145deg, #fbfdff 0%, #edf5ff 56%, #f3f8ff 100%); }
.hero-orb { position: absolute; border-radius: 50%; pointer-events: none; }
.orb-one { width: 360px; height: 360px; left: -210px; top: 80px; border: 82px solid rgba(86,146,255,.08); }
.orb-two { width: 440px; height: 440px; right: -250px; bottom: -250px; border: 95px solid rgba(43,108,246,.07); }
.hero-content { min-height: 530px; display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; z-index: 1; text-align: center; }
.eyebrow { color: var(--blue-dark); font-size: .78rem; font-weight: 850; letter-spacing: .17em; text-transform: uppercase; }
.hero-content h1 { margin: 24px 0 26px; font-size: clamp(3.3rem, 6vw, 6.4rem); line-height: 1.03; letter-spacing: -.075em; }
.hero-content h1 em { color: var(--blue); font-style: normal; }
.hero-content > p { max-width: 690px; margin: 0; color: var(--muted); font-size: 1.12rem; line-height: 1.9; }
.hero-actions { display: flex; justify-content: center; gap: 15px; margin: 36px 0 25px; }
.button { min-height: 56px; display: inline-flex; align-items: center; justify-content: center; gap: 18px; padding: 0 30px; border: 1px solid transparent; border-radius: 999px; font-size: .96rem; font-weight: 850; transition: transform .2s ease, box-shadow .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: linear-gradient(135deg, #397cff, #205bd7); box-shadow: 0 15px 34px rgba(43,108,246,.28); }
.button-secondary { color: var(--blue-dark); border-color: #a9c8ff; background: rgba(255,255,255,.72); }
.hero-points { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 26px; margin: 0; padding: 0; color: #536783; list-style: none; font-size: .88rem; }
.hero-points span { width: 20px; height: 20px; display: inline-grid; place-items: center; margin-right: 7px; color: white; background: var(--blue); border-radius: 50%; font-size: .67rem; }

.apps-section { padding: 100px 0; background: #fff; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 38px; }
.section-heading h2 { margin: 12px 0 0; font-size: clamp(2.2rem, 4vw, 4rem); line-height: 1.12; letter-spacing: -.055em; }
.section-heading > p { max-width: 390px; margin: 0 0 6px; color: var(--muted); line-height: 1.8; }
.app-card { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(240px, .8fr); gap: 42px 58px; padding: 48px; border: 1px solid #e2ebfa; border-radius: 30px; background: linear-gradient(135deg, #fff, #f4f8ff); box-shadow: var(--shadow); }
.app-intro { display: grid; grid-template-columns: 104px 1fr; gap: 28px; align-items: start; }
.app-icon { width: 104px; height: 104px; display: grid; place-items: center; color: white; background: linear-gradient(145deg, #4b8cff, #1f5bd5); border-radius: 29px; box-shadow: 0 17px 34px rgba(43,108,246,.25); }
.app-icon span { font-family: "KaiTi", "STKaiti", serif; font-size: 2.65rem; font-weight: 800; }
.platform { display: inline-block; margin-bottom: 10px; color: var(--blue-dark); font-size: .74rem; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
.app-intro h3 { margin: 0 0 12px; font-size: 2rem; letter-spacing: -.04em; }
.app-intro p { max-width: 650px; margin: 0; color: var(--muted); font-size: 1rem; line-height: 1.85; }
.app-features { display: grid; gap: 10px; align-content: center; }
.app-features span { display: flex; align-items: center; gap: 14px; padding: 14px 17px; color: #415674; border: 1px solid rgba(202,219,248,.72); border-radius: 15px; background: rgba(255,255,255,.75); font-size: .91rem; font-weight: 750; }
.app-features i { color: #8cabdf; font-size: .72rem; font-style: normal; font-weight: 800; }
.app-actions { grid-column: 1 / -1; display: flex; align-items: center; gap: 28px; padding-top: 7px; border-top: 1px solid var(--line); }
.app-actions .button { min-height: 52px; }
.text-link { color: var(--blue-dark); font-size: .92rem; font-weight: 800; }
.text-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.more-note { display: flex; align-items: center; justify-content: center; gap: 15px; margin-top: 34px; color: var(--muted); text-align: left; }
.more-note p { margin: 0; font-size: .88rem; line-height: 1.6; }
.more-note b { color: var(--ink); }
.pulse { width: 13px; height: 13px; flex: 0 0 auto; background: var(--blue); border: 4px solid #dce9ff; border-radius: 50%; box-sizing: content-box; }

.principles-section { padding: 96px 0 110px; background: linear-gradient(180deg, #f7faff, #eef5ff); }
.section-heading.compact { justify-content: center; text-align: center; }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.principle-grid article { padding: 34px; border: 1px solid rgba(255,255,255,.95); border-radius: 24px; background: rgba(255,255,255,.86); box-shadow: var(--shadow-soft); }
.principle-grid article > span { width: 54px; height: 54px; display: grid; place-items: center; color: var(--blue-dark); background: var(--blue-soft); border-radius: 17px; font-size: 1.1rem; font-weight: 900; }
.principle-grid h3 { margin: 24px 0 10px; font-size: 1.2rem; }
.principle-grid p { margin: 0; color: var(--muted); font-size: .92rem; line-height: 1.75; }

footer { padding: 54px 0 26px; color: #d8e6ff; background: #0e2345; }
.footer-main { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 32px; padding-bottom: 34px; }
.footer-main .brand-mark { filter: drop-shadow(0 7px 14px rgba(0,0,0,.2)); }
.footer-main p { margin: 0; color: #9eb3d5; font-size: .86rem; }
.footer-main nav { justify-self: end; display: flex; gap: 25px; color: #b7cae7; font-size: .85rem; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding-top: 22px; color: #8299bd; border-top: 1px solid rgba(255,255,255,.1); font-size: .76rem; }

@media (max-width: 850px) {
  .container { width: min(100% - 32px, 700px); }
  .nav-shell { grid-template-columns: 1fr auto; }
  .site-header nav { display: none; }
  .hero-section { padding-top: 62px; }
  .hero-content { min-height: 500px; }
  .section-heading { align-items: start; flex-direction: column; gap: 14px; }
  .app-card { grid-template-columns: 1fr; padding: 35px; }
  .app-actions { grid-column: 1; }
  .principle-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .footer-main nav { justify-self: center; }
}

@media (max-width: 560px) {
  .container { width: min(100% - 24px, 520px); }
  .nav-shell { min-height: 68px; }
  .brand-mark { width: 34px; height: 34px; border-radius: 11px; }
  .header-button { padding: 9px 15px; font-size: .8rem; }
  .hero-section { padding: 48px 0 38px; }
  .hero-content { min-height: 480px; }
  .hero-content h1 { font-size: clamp(2.75rem, 13.4vw, 4.2rem); }
  .hero-content > p { font-size: 1rem; }
  .hero-actions { width: 100%; flex-direction: column; }
  .button { width: 100%; }
  .hero-points { width: max-content; flex-direction: column; align-items: flex-start; }
  .apps-section, .principles-section { padding: 72px 0; }
  .section-heading h2 { font-size: 2.45rem; }
  .app-card { gap: 30px; padding: 25px 21px; border-radius: 24px; }
  .app-intro { grid-template-columns: 72px 1fr; gap: 17px; }
  .app-icon { width: 72px; height: 72px; border-radius: 21px; }
  .app-icon span { font-size: 2rem; }
  .app-intro h3 { font-size: 1.55rem; }
  .app-intro p { grid-column: 1 / -1; font-size: .94rem; }
  .app-actions { align-items: stretch; flex-direction: column; gap: 18px; text-align: center; }
  .principle-grid article { padding: 27px; }
  .footer-bottom { align-items: center; flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}