/* ============ reset ============ */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd, fieldset { margin: 0; }

ul, ol { padding: 0; list-style: none; }

img, svg, video { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; width: 100%; }

/* ============ tokens ============ */
:root {
  --red: #8C1D22;
  --red-deep: #5E1216;
  --orange: #F0932B;
  --gold: #FFC857;
  --ink: #0D1A2B;
  --ink-mid: #17293F;
  --teal: #34B3A0;
  --paper: #F4EDE2;
  --paper-deep: #E2D6C3;
  --black: #0B0E12;
  --gray: #8B9099;

  --font-display: "Noto Sans SC Heavy", "Source Han Sans SC Heavy", "PingFang SC Semibold", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC Regular", "Source Han Sans SC Regular", "PingFang SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1280px;
  --gutter: clamp(16px, 4vw, 48px);
  --section-y: clamp(56px, 9vw, 140px);
  --hard-shadow: 6px 6px 0 var(--red-deep);
  --hard-shadow-dark: 6px 6px 0 var(--black);
}

/* ============ base ============ */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--black);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.content-well {
  width: 100%;
  max-width: 840px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: 50%;
  top: -140px;
  transform: translateX(-50%);
  z-index: 200;
  background: var(--gold);
  color: var(--black);
  padding: 12px 24px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  border: 2px solid var(--black);
  transition: top 0.2s ease;
}

.skip-link:focus { top: 10px; }

/* ============ buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.06em;
  padding: 12px 22px;
  border: 2px solid var(--black);
  cursor: pointer;
  text-align: center;
  transition: transform 0.16s ease, box-shadow 0.16s ease, background-color 0.16s ease, color 0.16s ease;
}

.btn-primary {
  background: var(--orange);
  color: var(--ink);
  box-shadow: 5px 5px 0 var(--black);
}

.btn-primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--black);
}

.btn-primary:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--black);
}

.btn-ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--paper);
}

.btn-ghost:hover {
  background: var(--paper);
  color: var(--ink);
}

/* ============ header : ticker ============ */
.site-header { position: relative; z-index: 60; }

.header-ticker {
  background: var(--ink);
  color: var(--paper);
  border-bottom: 2px solid var(--red-deep);
}

.ticker-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 30px;
  min-height: 40px;
  padding-block: 7px;
  font-size: 13px;
  letter-spacing: 0.03em;
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: #C6CFDA;
}

.ticker-item b.mono { color: var(--gold); font-weight: 700; }

.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 3px rgba(52, 179, 160, 0.24);
  animation: pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 3px rgba(52, 179, 160, 0.24); }
  50% { box-shadow: 0 0 0 8px rgba(52, 179, 160, 0); }
}

/* ============ header : masthead ============ */
.header-masthead {
  position: relative;
  background: var(--red);
  border-bottom: 2px solid var(--black);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.05) 0 1px,
    transparent 1px 46px
  );
}

.masthead-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding-block: clamp(18px, 2.8vw, 32px);
}

.masthead-note {
  justify-self: start;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: 12px;
  letter-spacing: 0.32em;
  color: rgba(244, 237, 226, 0.55);
  white-space: nowrap;
}

.brand {
  grid-column: 2;
  justify-self: center;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-align: left;
}

.brand-mark {
  flex: none;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--orange);
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
}

.brand-mark-inner {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.brand-text { display: flex; flex-direction: column; gap: 2px; }

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.brand-sub {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(244, 237, 226, 0.7);
}

.masthead-cta { justify-self: end; }

/* ============ header : navbar ============ */
.header-navbar {
  position: relative;
  background: var(--red-deep);
  border-bottom: 2px solid var(--black);
  z-index: 60;
}

.navbar-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 58px;
}

.nav-rail {
  display: none;
  position: absolute;
  left: var(--gutter);
  top: 50%;
  transform: translateY(-50%) rotate(180deg);
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: 0.36em;
  color: rgba(244, 237, 226, 0.45);
  white-space: nowrap;
  pointer-events: none;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--orange);
  color: var(--ink);
  border: 2px solid var(--black);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.06em;
  padding: 9px 15px;
  cursor: pointer;
  box-shadow: 4px 4px 0 var(--black);
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.nav-toggle:hover { transform: translate(-1px, -1px); box-shadow: 6px 6px 0 var(--black); }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.primary-nav {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  background: var(--ink);
  border-top: 2px solid var(--black);
  border-bottom: 2px solid var(--red-deep);
  max-height: 0;
  overflow: hidden;
  visibility: hidden;
  transition: max-height 0.3s ease, visibility 0.3s ease;
}

.primary-nav[data-open="true"] {
  max-height: min(72vh, 560px);
  overflow-y: auto;
  visibility: visible;
}

.nav-list { display: flex; flex-direction: column; }

.nav-item { border-bottom: 1px solid rgba(244, 237, 226, 0.12); }

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 15px var(--gutter);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--paper);
  transition: color 0.16s ease, background-color 0.16s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--orange);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.18s ease;
}

.nav-link:hover { color: var(--gold); background: rgba(240, 147, 43, 0.08); }
.nav-link:hover::after,
.nav-link[aria-current="page"]::after { transform: scaleY(1); }

.nav-link[aria-current="page"] {
  color: var(--gold);
  background: rgba(240, 147, 43, 0.12);
}

.nav-idx {
  font-size: 12px;
  font-weight: 400;
  color: var(--orange);
  letter-spacing: 0.06em;
}

.nav-link[aria-current="page"] .nav-idx { color: var(--gold); }

/* ============ footer ============ */
.site-footer {
  background: var(--ink);
  color: var(--paper);
  border-top: 8px solid var(--red);
  margin-top: var(--section-y);
}

.footer-main {
  padding-block: clamp(44px, 6vw, 84px);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 3.4vw, 52px);
}

.footer-col { min-width: 0; }

.footer-brand {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  letter-spacing: 0.04em;
  color: var(--paper);
}

.footer-tag {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: rgba(244, 237, 226, 0.5);
}

.footer-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--gold);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--red-deep);
}

.footer-list { display: flex; flex-direction: column; gap: 10px; }

.footer-link {
  display: inline-block;
  font-size: 15px;
  color: rgba(244, 237, 226, 0.86);
  border-bottom: 2px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer-link:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.footer-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
  margin-bottom: 2px;
}

.footer-contact { gap: 16px; }

.copy-value {
  display: inline-block;
  position: relative;
  font-size: 14px;
  color: rgba(244, 237, 226, 0.92);
  border-bottom: 2px dotted var(--gold);
  cursor: pointer;
  word-break: break-all;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.copy-value:hover { color: var(--orange); border-bottom-color: var(--orange); }

.copy-value::after {
  content: "已复制";
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--orange);
  padding: 3px 9px;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(5px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.copy-value[data-copied="true"]::after { opacity: 1; transform: translateY(0); }

.footer-addr {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 237, 226, 0.82);
}

.footer-scale { background: var(--ink); }

.scale-bar {
  display: block;
  height: 13px;
  background-image:
    repeating-linear-gradient(90deg, rgba(244, 237, 226, 0.38) 0 1px, transparent 1px 12px),
    repeating-linear-gradient(90deg, var(--orange) 0 1px, transparent 1px 72px);
  border-top: 1px solid rgba(244, 237, 226, 0.14);
  border-bottom: 2px solid var(--red-deep);
}

.scale-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 34px;
  padding-block: 18px 24px;
  font-size: 13px;
  color: rgba(244, 237, 226, 0.72);
}

.scale-text { margin: 0; }
.scale-text b.mono { color: var(--gold); font-weight: 700; }

/* ============ breadcrumb ============ */
.breadcrumb {
  padding-block: 18px;
  border-bottom: 1px solid var(--paper-deep);
  background: var(--paper);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.breadcrumb-item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--paper-deep);
}

.breadcrumb-item a { color: var(--red); border-bottom: 1px solid transparent; }
.breadcrumb-item a:hover { border-bottom-color: var(--red); }
.breadcrumb-item [aria-current="page"] { color: var(--black); }

/* ============ prose ============ */
.prose {
  font-size: 17px;
  line-height: 1.85;
  color: var(--black);
}

.prose > * + * { margin-top: 1.15em; }

.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: var(--black);
}

.prose h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); margin-top: 2.2em; }
.prose h3 { font-size: clamp(1.2rem, 2.2vw, 1.5rem); margin-top: 1.8em; }
.prose h4 { font-size: 1.05rem; margin-top: 1.6em; }

.prose ul,
.prose ol { margin-top: 1.05em; display: flex; flex-direction: column; gap: 0.6em; }

.prose li {
  position: relative;
  padding-left: 1.5em;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0.2em;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.prose ol { counter-reset: prose-ol; }

.prose ol li { counter-increment: prose-ol; }

.prose ol li::before {
  content: counter(prose-ol, decimal-leading-zero);
  top: 0;
  left: 0;
  width: auto;
  height: auto;
  background: none;
  clip-path: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--red);
  padding-top: 0.42em;
}

.prose a {
  color: var(--red);
  border-bottom: 2px solid var(--orange);
  transition: background-color 0.16s ease;
}

.prose a:hover { background: rgba(240, 147, 43, 0.16); }

.prose strong { font-family: var(--font-display); font-weight: 800; }

.prose blockquote {
  border-left: 6px solid var(--orange);
  background: var(--paper-deep);
  padding: 18px 22px;
  font-size: 1.02rem;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--paper-deep);
  padding: 2px 6px;
}

.prose hr {
  border: 0;
  border-top: 2px solid var(--black);
  margin-block: 2.4em;
}

/* ============ bento & grid ============ */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(14px, 1.8vw, 26px);
}

.span-3 { grid-column: span 12; }
.span-4 { grid-column: span 12; }
.span-5 { grid-column: span 12; }
.span-6 { grid-column: span 12; }
.span-7 { grid-column: span 12; }
.span-8 { grid-column: span 12; }
.span-9 { grid-column: span 12; }
.span-12 { grid-column: span 12; }

.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(14px, 1.8vw, 26px);
}

.bento-card {
  position: relative;
  grid-column: span 12;
  background: var(--paper);
  border: 2px solid var(--black);
  box-shadow: var(--hard-shadow);
  padding: clamp(20px, 2.6vw, 34px);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.bento-card:hover {
  transform: translate(-2px, -4px);
  box-shadow: 10px 10px 0 var(--red-deep);
}

.bento-card.is-dark {
  background: var(--ink-mid);
  color: var(--paper);
  border-color: var(--red-deep);
  box-shadow: var(--hard-shadow-dark);
}

.bento-card.is-dark:hover { box-shadow: 10px 10px 0 var(--black); }

.coord {
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  background: var(--black);
  color: var(--gold);
  padding: 4px 10px;
}

/* ============ media frame ============ */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 2px solid var(--black);
  background: var(--ink-mid);
}

.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.media-frame.is-4x3 img { aspect-ratio: 4 / 3; }
.media-frame.is-1x1 img { aspect-ratio: 1 / 1; }
.media-frame.is-wide img { aspect-ratio: 21 / 9; }

.media-frame.has-overlay::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(13, 26, 43, 0) 52%, rgba(11, 14, 18, 0.6) 100%);
}

/* ============ reveal ============ */
[data-reveal-ready] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

[data-reveal-ready][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ============ scroll progress & to-top ============ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--orange);
  z-index: 120;
  pointer-events: none;
  transition: width 0.1s linear;
}

.to-top {
  position: fixed;
  right: clamp(14px, 2.4vw, 34px);
  bottom: clamp(14px, 2.4vw, 34px);
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--gold);
  border: 2px solid var(--orange);
  box-shadow: 5px 5px 0 var(--black);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease, background-color 0.16s ease;
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { background: var(--red); color: var(--paper); }

/* ============ responsive ============ */
@media (min-width: 601px) {
  .span-3 { grid-column: span 6; }
  .span-4 { grid-column: span 6; }
  .bento-card { grid-column: span 6; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 901px) {
  .nav-toggle { display: none; }
  .nav-rail { display: block; }

  .primary-nav {
    position: static;
    flex: 1;
    max-height: none;
    overflow: visible;
    visibility: visible;
    background: transparent;
    border: 0;
  }

  .nav-list {
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: clamp(6px, 2vw, 30px);
  }

  .nav-item { border-bottom: 0; }

  .navbar-inner {
    position: relative;
    justify-content: center;
  }

  .nav-link {
    width: auto;
    padding: 14px 2px;
    font-size: 15px;
  }

  .nav-link::after {
    top: auto;
    left: 0;
    right: 0;
    bottom: 6px;
    width: auto;
    height: 3px;
    transform: scaleX(0);
    transform-origin: left center;
  }

  .nav-link:hover { background: transparent; }
  .nav-link:hover::after,
  .nav-link[aria-current="page"]::after { transform: scaleX(1); }

  .nav-link[aria-current="page"] { background: transparent; }

  .span-3 { grid-column: span 3; }
  .span-4 { grid-column: span 4; }
  .span-5 { grid-column: span 5; }
  .span-6 { grid-column: span 6; }
  .span-7 { grid-column: span 7; }
  .span-8 { grid-column: span 8; }
  .span-9 { grid-column: span 9; }

  .bento-card { grid-column: span 6; }

  .footer-grid {
    grid-template-columns: 1.25fr 1fr 1.65fr 1fr;
  }
}

@media (max-width: 760px) {
  .masthead-inner {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 14px;
  }

  .masthead-note { display: none; }
  .brand { grid-column: 1; justify-self: center; text-align: center; }
  .brand-text { align-items: center; }
  .masthead-cta { grid-column: 1; justify-self: center; }
  .ticker-inner { gap: 4px 18px; font-size: 12px; }
  .scale-inner { gap: 4px 20px; font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal-ready] {
    opacity: 1;
    transform: none;
  }
}