/* ==========================================================================
   IMTOKEN钱包 · 共享外壳样式
   路径：/assets/site.css
   ========================================================================== */

/* --- 1. Reset ---------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html, body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* --- 2. Tokens --------------------------------------------------------- */
:root {
  --c-ink: #0A0E14;
  --c-hull: #131C2B;
  --c-brand: #1E5EFF;
  --c-brand-deep: #0C36A8;
  --c-cyan: #2BE3D0;
  --c-amber: #FFA23A;
  --c-paper: #F3F1EA;
  --c-mist: #C7D2E4;
  --c-lead: #7C8AA0;
  --c-grid: #22304A;
  --c-ink-soft: #1A2230;

  --font-display: 'Archivo Narrow', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', 'HarmonyOS Sans', 'PingFang SC', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --wrap-max: 1280px;
  --gutter: clamp(20px, 4vw, 48px);
  --space-block: clamp(64px, 7vw, 112px);

  --dur-micro: 160ms;
  --dur-enter: 400ms;
  --ease: cubic-bezier(.22, .7, .28, 1);
}

/* --- 3. Base typography ------------------------------------------------ */
html {
  overflow-x: clip;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  background: var(--c-ink);
  color: var(--c-mist);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--c-paper);
}
p { text-wrap: pretty; }
strong { color: var(--c-paper); font-weight: 600; }
::selection { background: var(--c-brand); color: #FFFFFF; }

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}
main:focus { outline: none; }
#main-content { scroll-margin-top: 96px; }

/* --- 4. Type utilities ------------------------------------------------- */
.display-xl {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(56px, 9vw, 132px);
  line-height: .92;
  letter-spacing: -.02em;
  color: var(--c-paper);
}
.display-l {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 5vw, 72px);
  line-height: 1;
  letter-spacing: -.015em;
  color: var(--c-paper);
}
.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 2.6vw, 36px);
  line-height: 1.2;
  color: var(--c-paper);
}
.lede {
  font-size: clamp(17px, 1.35vw, 19px);
  line-height: 1.85;
  color: var(--c-mist);
  max-width: 42ch;
}
.mono,
code, kbd, samp {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: .92em;
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
}
.num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-brand);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
  flex: none;
}

/* --- 5. Layout --------------------------------------------------------- */
.wrap,
.wrap-wide,
.wrap-narrow {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap { max-width: var(--wrap-max); }
.wrap-wide { max-width: 1560px; }
.wrap-narrow { max-width: 820px; }

.section { padding-block: var(--space-block); }
.section-tight { padding-block: clamp(40px, 4vw, 64px); }
.rule { height: 1px; background: var(--c-grid); border: 0; }

.grid { display: grid; gap: clamp(20px, 2.4vw, 32px); }
.grid-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
@media (max-width: 1024px) { .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); } }
@media (max-width: 640px)  { .grid-12 { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --- 6. Skip link ------------------------------------------------------ */
.skip-link {
  position: fixed;
  top: 8px; left: 8px;
  z-index: 200;
  transform: translateY(-160%);
  padding: 10px 18px;
  background: var(--c-brand);
  color: #FFFFFF;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.4;
  border-radius: 4px;
  transition: transform var(--dur-micro) ease;
}
.skip-link:focus { transform: translateY(0); }

/* --- 7. Buttons -------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 18px;
  flex: none;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1;
  letter-spacing: .02em;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color var(--dur-micro) ease,
              color var(--dur-micro) ease,
              border-color var(--dur-micro) ease;
}
.btn-primary { background: var(--c-brand); color: #FFFFFF; border-color: var(--c-brand); }
.btn-primary:hover { background: var(--c-brand-deep); border-color: var(--c-brand-deep); }
.btn-primary:active { background: #092A85; border-color: #092A85; }
.btn-ghost { background: transparent; color: var(--c-mist); border-color: var(--c-grid); }
.btn-ghost:hover { color: var(--c-paper); border-color: var(--c-brand); }
.btn-ghost:active { background: var(--c-brand-deep); color: var(--c-paper); border-color: var(--c-brand-deep); }
.btn-block { width: 100%; }
.btn[disabled], .btn[aria-disabled="true"] { color: var(--c-lead); border-color: var(--c-grid); background: transparent; pointer-events: none; }
.cta-lead { display: inline; }

/* --- 8. Header --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  display: flex;
  justify-content: center;
  padding: clamp(10px, 1.4vw, 18px) clamp(12px, 2vw, 28px);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(180deg,
    rgba(10, 14, 20, .95) 0%,
    rgba(10, 14, 20, .78) 62%,
    rgba(10, 14, 20, 0) 100%);
}

.header-island {
  position: relative;
  width: 100%;
  max-width: 1360px;
  min-height: 64px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(14px, 2vw, 36px);
  padding: 0 10px 0 12px;
  background: var(--c-hull);
  border: 1px solid var(--c-grid);
  border-radius: 6px;
  transition: min-height var(--dur-micro) linear;
}
.site-header[data-condensed] .header-island { min-height: 54px; }
.site-header[data-condensed] .brand-tagline { display: none; }

/* brand */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  padding: 6px 4px;
  border-radius: 4px;
}
.brand-mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--c-brand);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  border-radius: 3px;
}
.brand-copy { display: flex; flex-direction: column; min-width: 0; line-height: 1.3; }
.brand-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--c-paper);
}
.brand-tagline {
  font-size: 11px;
  letter-spacing: .07em;
  color: var(--c-lead);
  white-space: nowrap;
}

/* nav */
.nav { grid-column: 2; min-width: 0; display: flex; justify-content: center; }
.nav-list { display: flex; align-items: center; gap: clamp(0px, .8vw, 10px); }
.nav-item { flex: none; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 11px;
  font-size: 14px;
  color: var(--c-mist);
  border-radius: 3px;
  transition: color var(--dur-micro) ease, background-color var(--dur-micro) ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 11px; right: 11px; bottom: 2px;
  height: 1px;
  background: var(--c-brand);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-micro) ease, background-color var(--dur-micro) ease;
}
.nav-link:hover { color: var(--c-paper); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] {
  background: var(--c-brand-deep);
  color: var(--c-paper);
}
.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--c-cyan); }
.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--c-lead);
  transition: color var(--dur-micro) ease;
}
.nav-link[aria-current="page"] .nav-index { color: var(--c-cyan); }
.nav-label { white-space: nowrap; }

.nav-foot { display: none; }
.nav-note { font-size: 12px; letter-spacing: .04em; color: var(--c-lead); }

/* actions */
.header-actions {
  grid-column: 3;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 42px;
  height: 42px;
  flex: none;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-grid);
  border-radius: 4px;
  transition: border-color var(--dur-micro) ease;
}
.nav-toggle:hover { border-color: var(--c-brand); }
.nav-toggle-bar {
  position: absolute;
  left: 50%; top: 50%;
  width: 18px;
  height: 1px;
  margin: -.5px 0 0 -9px;
  background: var(--c-mist);
  transition: transform var(--dur-micro) ease, background-color var(--dur-micro) ease;
}
.nav-toggle-bar--a { transform: translateY(-3px); }
.nav-toggle-bar--b { transform: translateY(3px); }
.nav-toggle[aria-expanded="true"] { border-color: var(--c-brand); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: var(--c-cyan); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar--a { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar--b { transform: rotate(-45deg); }

/* scroll progress */
.header-progress {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.header-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--c-brand);
  transform: scaleX(0);
  transform-origin: left center;
}

/* --- 9. Mobile navigation --------------------------------------------- */
@media (max-width: 900px) {
  .header-island { grid-template-columns: minmax(0, 1fr) auto; padding-right: 8px; }
  .header-cta-secondary { display: none; }
  .nav-toggle { display: flex; }
  .brand-tagline { display: none; }
  .site-header[data-condensed] .brand-tagline { display: none; }

  .nav {
    position: fixed;
    inset: 0 0 0 auto;
    z-index: 90;
    width: min(86vw, 360px);
    display: block;
    padding: 88px clamp(20px, 5vw, 28px) 32px;
    background: var(--c-hull);
    border-left: 1px solid var(--c-grid);
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(101%);
    visibility: hidden;
    transition: transform 240ms var(--ease), visibility 0s linear 240ms;
  }
  .nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 240ms var(--ease), visibility 0s linear 0s;
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-item { border-bottom: 1px solid var(--c-grid); }
  .nav-link {
    width: 100%;
    justify-content: flex-start;
    gap: 14px;
    padding: 16px 4px;
    font-size: 17px;
    border-radius: 0;
  }
  .nav-link::after { display: none; }
  .nav-link:hover { color: var(--c-paper); }
  .nav-link[aria-current="page"] { background: transparent; color: var(--c-paper); }
  .nav-link[aria-current="page"] .nav-index { color: var(--c-cyan); }
  .nav-link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: -2px; top: 50%;
    width: 2px; height: 18px;
    margin-top: -9px;
    background: var(--c-cyan);
  }
  .nav-index { font-size: 12px; }
  .nav-foot { display: grid; gap: 10px; margin-top: 28px; }
}
@media (max-width: 560px) {
  .header-cta-primary { height: 36px; padding: 0 12px; font-size: 13px; }
  .cta-lead { display: none; }
  .brand-mark { width: 34px; height: 34px; font-size: 13px; }
  .brand-name { font-size: 15px; }
}

/* --- 10. Footer -------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 120px);
  background: var(--c-hull);
  border-top: 1px solid var(--c-grid);
}
.footer-inner {
  width: 100%;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding: clamp(52px, 6vw, 88px) var(--gutter) clamp(36px, 4vw, 52px);
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.3fr);
  gap: clamp(28px, 4vw, 56px);
}
.footer-brand { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.footer-brand-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--c-paper);
}
.footer-brand-tag { font-size: 13px; letter-spacing: .04em; color: var(--c-mist); }
.footer-brand-scope {
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-lead);
  max-width: 36ch;
}

.footer-col { min-width: 0; }
.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-brand);
  margin-bottom: 18px;
}
.footer-links { display: grid; gap: 11px; }
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  color: var(--c-mist);
  transition: color var(--dur-micro) ease;
}
.footer-link::before {
  content: "";
  flex: none;
  width: 4px;
  height: 4px;
  background: var(--c-grid);
  transition: background-color var(--dur-micro) ease;
}
.footer-link:hover { color: var(--c-paper); }
.footer-link:hover::before { background: var(--c-brand); }

.footer-contact { display: grid; gap: 9px; }
.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
}
.footer-contact-key {
  flex: none;
  width: 32px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-lead);
}
.footer-contact-value { overflow-wrap: anywhere; }
.footer-contact-note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-lead);
  max-width: 34ch;
}

.footer-base { border-top: 1px solid var(--c-grid); }
.footer-base-inner {
  width: 100%;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding: 18px var(--gutter) 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
}
.footer-legal,
.footer-copy {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--c-lead);
  font-variant-numeric: tabular-nums;
}
.footer-note {
  flex-basis: 100%;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-lead);
  max-width: 84ch;
}

@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 600px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-base-inner { justify-content: flex-start; }
}

/* --- 11. Breadcrumb ---------------------------------------------------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--c-lead);
}
.breadcrumb a { color: var(--c-lead); transition: color var(--dur-micro) ease; }
.breadcrumb a:hover { color: var(--c-paper); }
.breadcrumb-sep { color: var(--c-grid); }
.breadcrumb [aria-current="page"] { color: var(--c-mist); }

/* --- 12. Tags & status ------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 1.5;
  color: var(--c-mist);
  border: 1px solid var(--c-grid);
  border-radius: 2px;
}
.tag--brand { border-color: rgba(30, 94, 255, .55); color: #7FA6FF; }
.tag--cyan  { border-color: rgba(43, 227, 208, .42); color: var(--c-cyan); }
.tag--amber { border-color: rgba(255, 162, 58, .42); color: var(--c-amber); }

.status-dot {
  display: inline-block;
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
}
.status-dot--amber { background: var(--c-amber); }
.status-dot--pulse { animation: dot-breathe 2.4s ease-in-out infinite; }
@keyframes dot-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: .55; }
}

/* --- 13. Figure / image containers ------------------------------------- */
.figure {
  position: relative;
  margin: 0;
  background: var(--c-ink);
  border: 1px solid var(--c-grid);
  overflow: hidden;
}
.figure-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.figure-frame--wide { aspect-ratio: 21 / 9; }
.figure-frame--tall { aspect-ratio: 3 / 4; }
.figure-frame--square { aspect-ratio: 1 / 1; }
.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(34, 48, 74, .5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 48, 74, .5) 1px, transparent 1px);
  background-size: 48px 48px;
}
.figure-placeholder {
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  background-color: var(--c-ink);
  background-image:
    linear-gradient(to right, var(--c-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--c-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--c-lead);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.figure-caption {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  background: var(--c-hull);
  border-top: 1px solid var(--c-grid);
  font-size: 12px;
  letter-spacing: .03em;
  line-height: 1.7;
  color: var(--c-lead);
}
.figure-caption-tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-brand);
}

/* --- 14. Paper zone ---------------------------------------------------- */
.zone-paper { background: var(--c-paper); color: var(--c-ink-soft); }
.zone-paper h1, .zone-paper h2, .zone-paper h3, .zone-paper h4,
.zone-paper .section-title, .zone-paper .display-xl, .zone-paper .display-l { color: #0A0E14; }
.zone-paper .lede { color: #3A4557; }
.zone-paper .rule { background: #D9D3C4; }
.zone-paper .breadcrumb, .zone-paper .breadcrumb a { color: #6B7385; }

/* --- 15. Reveal -------------------------------------------------------- */
html.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-enter) var(--ease), transform var(--dur-enter) var(--ease);
}
html.reveal-ready [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* --- 16. Reduced motion ------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.reveal-ready [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .status-dot--pulse { animation: none; }
  .nav,
  .skip-link,
  .header-island,
  .nav-link,
  .nav-link::after,
  .nav-toggle,
  .nav-toggle-bar,
  .btn,
  .footer-link,
  .footer-link::before {
    transition: none !important;
  }
  .nav { transition: none !important; visibility: visible; }
}