:root {
  color-scheme: light;
  --ink: #10234a;
  --ink-soft: #53617b;
  --blue: #1b66d8;
  --blue-deep: #17488f;
  --line: rgba(39, 76, 135, 0.14);
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: #ffffff;
  --shadow: 0 24px 70px rgba(28, 67, 126, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: #f7fbff;
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  color: var(--ink);
  font-family:
    "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui,
    -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(circle at 83% 18%, rgba(95, 177, 255, 0.2), transparent 28rem),
    radial-gradient(circle at 9% 72%, rgba(58, 109, 218, 0.1), transparent 32rem),
    linear-gradient(145deg, #f9fcff 0%, #eef6ff 52%, #f8fbff 100%);
}

a {
  color: inherit;
}

.page-shell {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.site-header,
main,
.site-footer {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand:focus-visible,
.filing-links a:focus-visible {
  outline: 3px solid rgba(27, 102, 216, 0.35);
  outline-offset: 4px;
  border-radius: 6px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 14px;
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 700;
  background: linear-gradient(145deg, #226fdd, #173d85);
  box-shadow: 0 10px 24px rgba(27, 102, 216, 0.22);
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.site-type {
  padding: 8px 13px;
  border: 1px solid rgba(23, 72, 143, 0.12);
  border-radius: 999px;
  color: var(--blue-deep);
  font-size: 0.875rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.62);
}

main {
  flex: 1;
  display: flex;
  align-items: center;
  padding-block: 48px 80px;
}

.hero {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  align-items: center;
  gap: clamp(48px, 8vw, 104px);
}

.domain,
.card-kicker {
  margin: 0 0 18px;
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 750;
  letter-spacing: 0.18em;
}

h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(2.7rem, 6.1vw, 5.4rem);
  font-weight: 750;
  line-height: 1.08;
  letter-spacing: -0.055em;
  text-wrap: balance;
}

.intro {
  max-width: 660px;
  margin: 32px 0 0;
  color: #33476a;
  font-size: clamp(1.05rem, 1.4vw, 1.22rem);
  line-height: 1.85;
}

.scope-note {
  max-width: 660px;
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 3px solid rgba(27, 102, 216, 0.35);
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.75;
}

.concept-card {
  position: relative;
  padding: clamp(28px, 4vw, 42px);
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.concept-card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 34px;
  width: 72px;
  height: 4px;
  border-radius: 0 0 8px 8px;
  background: linear-gradient(90deg, var(--blue), #77bdff);
}

.concept-card h2 {
  margin: 0;
  font-size: clamp(1.55rem, 2.5vw, 2.05rem);
  line-height: 1.35;
  letter-spacing: -0.025em;
}

.concept-list {
  margin: 30px 0 0;
}

.concept-list div {
  padding-block: 19px;
  border-top: 1px solid var(--line);
}

.concept-list div:first-child {
  padding-top: 0;
  border-top: 0;
}

.concept-list div:last-child {
  padding-bottom: 0;
}

.concept-list dt {
  margin-bottom: 7px;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 700;
}

.concept-list dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.7;
}

.site-footer {
  padding-bottom: max(24px, env(safe-area-inset-bottom));
}

.filing-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 24px;
  border-radius: 18px;
  color: rgba(255, 255, 255, 0.9);
  background: linear-gradient(115deg, #15386f, #1a56a7);
  box-shadow: 0 16px 36px rgba(21, 56, 111, 0.18);
}

.filing-title {
  flex: none;
  font-size: 0.9rem;
  font-weight: 750;
  letter-spacing: 0.12em;
}

.filing-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  font-size: 0.9rem;
  line-height: 1.6;
}

.filing-links a {
  color: #ffffff;
  font-weight: 650;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.filing-links a:hover {
  text-decoration-thickness: 2px;
}

.filing-divider {
  width: 1px;
  height: 18px;
  background: rgba(255, 255, 255, 0.25);
}

.filing-pending {
  color: rgba(255, 255, 255, 0.72);
}

.copyright {
  margin: 15px 4px 0;
  color: #6d7890;
  font-size: 0.8rem;
  text-align: right;
}

@media (max-width: 820px) {
  .site-header,
  main,
  .site-footer {
    width: min(100% - 36px, 640px);
  }

  .site-header {
    padding-block: 24px;
  }

  main {
    align-items: flex-start;
    padding-block: 52px 64px;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  h1 {
    font-size: clamp(2.55rem, 12vw, 4.5rem);
  }

  .concept-card {
    border-radius: 24px;
  }

  .filing-panel,
  .filing-links {
    align-items: flex-start;
    flex-direction: column;
  }

  .filing-panel,
  .filing-links {
    gap: 12px;
  }

  .filing-divider {
    width: 48px;
    height: 1px;
  }

  .copyright {
    text-align: left;
  }
}

@media (max-width: 460px) {
  .site-header,
  main,
  .site-footer {
    width: calc(100% - 28px);
  }

  .brand-name {
    font-size: 1rem;
    letter-spacing: 0.04em;
  }

  .site-type {
    padding: 7px 10px;
    font-size: 0.78rem;
  }

  main {
    padding-block: 38px 52px;
  }

  h1 {
    font-size: clamp(2.35rem, 12vw, 3.35rem);
    line-height: 1.13;
  }

  .intro {
    margin-top: 24px;
  }

  .concept-card {
    padding: 28px 24px;
  }

  .filing-panel {
    padding: 19px 20px;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .concept-card {
    background: var(--surface-strong);
    backdrop-filter: none;
  }
}

@media (forced-colors: active) {
  .brand-mark,
  .concept-card,
  .filing-panel {
    border: 1px solid CanvasText;
  }

  .filing-divider {
    background: CanvasText;
  }
}

/* 极简备案首页 */
.minimal-page {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}

.minimal-main {
  width: 100%;
  flex: 1;
  display: grid;
  place-items: center;
  padding: 48px 24px;
  text-align: center;
}

.minimal-identity {
  transform: translateY(-3vh);
}

.minimal-identity .brand-mark {
  width: 64px;
  height: 64px;
  margin: 0 auto 22px;
  border-radius: 20px;
  font-size: 1.5rem;
}

.minimal-identity h1 {
  font-size: clamp(2.5rem, 8vw, 4.8rem);
  letter-spacing: 0.08em;
}

.minimal-identity p {
  margin: 18px 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  letter-spacing: 0.16em;
}

.minimal-footer {
  width: min(100% - 32px, 920px);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 22px;
  margin: 0 auto;
  padding: 22px 0 max(26px, env(safe-area-inset-bottom));
  border-top: 1px solid rgba(20, 38, 74, 0.1);
  color: #6d7890;
  font-size: 0.82rem;
  line-height: 1.7;
}

.minimal-footer a {
  color: var(--blue);
  text-underline-offset: 4px;
}

.minimal-footer a:focus-visible {
  outline: 3px solid rgba(27, 102, 216, 0.3);
  outline-offset: 4px;
  border-radius: 4px;
}

@media (max-width: 480px) {
  .minimal-footer {
    flex-direction: column;
    align-items: center;
    gap: 3px;
  }
}