/* ==========================================================================
   米博 MIBO FUTURE — 共享站点样式 /assets/site.css
   夜间控制台 × 精密面板：轨道导航、色带长卷、等宽索引、粗野主义面板
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

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

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

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

main {
  display: block;
}

/* ---------- 2. Tokens ---------- */
:root {
  --ink-900: #071528;
  --ink-800: #0B1F3A;
  --ink-700: #12294A;
  --ink-600: #1B3A63;
  --cyan: #00F0FF;
  --teal: #00A7B5;
  --amber: #FFB300;
  --violet: #241A4A;
  --teal-deep: #06302E;
  --wine: #4A1230;
  --mist: #E8EEF9;
  --lilac: #A6A3C2;
  --white: #F5F8FF;

  --rail-w: 96px;
  --maxw: 1180px;
  --hair: 2px;
  --shadow-hard: 8px 8px 0 rgba(0, 0, 0, 0.55);
  --shadow-soft: 6px 6px 0 rgba(0, 0, 0, 0.45);

  --font-display: "DIN Condensed", "Barlow Condensed", "Oswald", "Arial Narrow",
    "Helvetica Neue", Arial, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular",
    Menlo, Consolas, "Courier New", monospace;
}

/* ---------- 3. Base / 中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-800);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: clamp(15px, 0.42vw + 13.6px, 17px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--white);
  font-stretch: condensed;
  text-wrap: balance;
}

h1 { font-size: clamp(2.6rem, 1.2rem + 5.6vw, 6.2rem); }
h2 { font-size: clamp(1.85rem, 1rem + 3vw, 3.3rem); }
h3 { font-size: clamp(1.12rem, 0.9rem + 0.75vw, 1.55rem); line-height: 1.25; }

p {
  max-width: 38em;
  text-wrap: pretty;
}

strong, b {
  color: var(--white);
  font-weight: 600;
}

::selection {
  background: var(--cyan);
  color: var(--ink-900);
}

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

/* ---------- 4. Utilities ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(1.05rem, 4vw, 3rem);
}

.stack > * + * {
  margin-top: var(--stack-gap, 1.25rem);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cluster-gap, 0.85rem);
  align-items: center;
}

/* ---------- 5. Chips / buttons ---------- */
.mono-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.18em 0.52em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: var(--cyan);
  background: var(--ink-700);
  border: 1px solid var(--ink-600);
  white-space: nowrap;
}

.mono-chip--amber {
  color: var(--ink-900);
  background: var(--amber);
  border-color: var(--amber);
}

.mono-chip--cyan {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.8rem 1.35rem;
  font-family: var(--font-body);
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1.25;
  color: var(--white);
  background: var(--ink-700);
  border: var(--hair) solid var(--ink-600);
  box-shadow: var(--shadow-soft);
  transition: transform 0.16s ease, box-shadow 0.16s ease,
    background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.55);
}

.btn--primary {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.btn--primary:hover {
  background: #6ef8ff;
  border-color: #6ef8ff;
}

.btn--amber {
  color: var(--ink-900);
  background: var(--amber);
  border-color: var(--amber);
}

.btn--amber:hover {
  background: #ffc736;
  border-color: #ffc736;
}

.btn--ghost {
  background: transparent;
  border-color: var(--ink-600);
  color: var(--mist);
}

/* ---------- 6. Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--lilac);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.5em;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--ink-600);
}

.breadcrumb a {
  color: var(--cyan);
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

.breadcrumb a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 7. Bands / grid veil ---------- */
.band {
  background: var(--violet);
  color: var(--mist);
}

.band--teal {
  background: var(--teal-deep);
}

.band--wine {
  background: var(--wine);
}

.grid-veil {
  background-image:
    linear-gradient(rgba(27, 58, 99, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 58, 99, 0.55) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ---------- 8. Media containers ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--ink-700);
  border: var(--hair) solid var(--ink-600);
  box-shadow: var(--shadow-hard);
}

.media > img,
.media > svg,
.media > picture > img,
.media > .media-art {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-art {
  display: grid;
  place-items: center;
  background-color: var(--ink-700);
  background-image:
    linear-gradient(rgba(0, 240, 255, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.09) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink-600);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }

.media-caption {
  margin-top: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--lilac);
}

/* ---------- 9. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  padding: 0.7rem 1.15rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--cyan);
  border: var(--hair) solid var(--ink-900);
  transform: translateY(-130%);
  transition: transform 0.18s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* ---------- 10. Header / rail ---------- */
.site-header {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 60;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  background: var(--ink-900);
  border-right: var(--hair) solid var(--ink-600);
}

.header-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 0.5rem 0.85rem;
  border-bottom: var(--hair) solid var(--ink-600);
  background: var(--ink-900);
}

.brand-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  text-align: center;
  color: var(--white);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1;
  letter-spacing: 0;
  color: var(--ink-900);
  background: var(--amber);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.6);
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.brand-link:hover .brand-mark,
.brand-link:focus-visible .brand-mark {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.65);
}

.brand-name {
  font-size: 0.82rem;
  line-height: 1.2;
  letter-spacing: 0.14em;
  color: var(--white);
}

.brand-latin {
  font-family: var(--font-mono);
  font-size: 0.52rem;
  line-height: 1.3;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.brand-tag {
  max-width: 74px;
  font-size: 0.58rem;
  line-height: 1.4;
  letter-spacing: 0.05em;
  color: var(--lilac);
}

.header-tools {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
}

.version-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 58px;
  padding: 0.32rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  line-height: 1.4;
  color: var(--ink-900);
  background: var(--amber);
  border: var(--hair) solid var(--amber);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.55);
  transition: background-color 0.15s ease, color 0.15s ease,
    border-color 0.15s ease, transform 0.15s ease;
}

.version-chip:hover {
  color: var(--amber);
  background: var(--ink-900);
  transform: translate(-1px, -1px);
}

.version-chip:active {
  transform: translate(1px, 1px);
}

.version-chip[data-copied="true"] {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--white);
  background: var(--ink-700);
  border: var(--hair) solid var(--ink-600);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.nav-toggle:hover {
  border-color: var(--cyan);
  background: var(--ink-600);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* ---------- 11. Desktop nav ---------- */
.site-nav {
  flex: 0 0 auto;
  padding: 0.75rem 0.45rem;
}

.nav-list {
  counter-reset: navidx;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-link {
  display: block;
  position: relative;
  padding: 0.55rem 0.3rem;
  font-size: 0.78rem;
  line-height: 1.35;
  letter-spacing: 0.04em;
  text-align: center;
  color: var(--lilac);
  border-left: 2px solid transparent;
  transition: color 0.15s ease, background-color 0.15s ease,
    border-color 0.15s ease;
}

.nav-link::before {
  counter-increment: navidx;
  content: counter(navidx, decimal-leading-zero);
  display: block;
  margin-bottom: 0.18rem;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  color: var(--ink-600);
  transition: color 0.15s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--white);
  background: var(--ink-700);
}

.nav-link:hover::before,
.nav-link:focus-visible::before {
  color: var(--cyan);
}

.nav-link[aria-current="page"] {
  color: var(--white);
  background: var(--ink-700);
  border-left-color: var(--cyan);
  box-shadow: inset 0 0 0 1px rgba(0, 240, 255, 0.22);
}

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

/* ---------- 12. Rail foot ---------- */
.rail-foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.85rem 0.45rem 1.1rem;
  background: var(--ink-800);
  border-top: var(--hair) solid var(--ink-600);
}

.rail-quick {
  padding: 0.42rem 0.25rem;
  font-size: 0.68rem;
  line-height: 1.4;
  letter-spacing: 0.03em;
  text-align: center;
  color: var(--lilac);
  border: 1px solid var(--ink-600);
  transition: color 0.15s ease, background-color 0.15s ease,
    border-color 0.15s ease;
}

.rail-quick:hover,
.rail-quick:focus-visible {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.rail-note {
  max-width: none;
  padding-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.56rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
  text-align: center;
  color: var(--ink-600);
}

/* ---------- 13. Scroll progress ---------- */
.scroll-progress {
  --progress: 0;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 70;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transform: scaleX(var(--progress));
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 14. Footer ---------- */
.site-footer {
  position: relative;
  background: var(--ink-900);
  border-top: var(--hair) solid var(--ink-600);
  color: var(--mist);
}

.footer-band {
  height: 10px;
  border-bottom: var(--hair) solid var(--ink-600);
  background: linear-gradient(
    90deg,
    var(--cyan) 0 22%,
    var(--amber) 22% 34%,
    var(--teal) 34% 58%,
    var(--violet) 58% 82%,
    var(--wine) 82% 100%
  );
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem 2rem;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 2.5rem clamp(1.05rem, 4vw, 3rem) 2rem;
}

.footer-brand {
  align-self: start;
}

.footer-wordmark {
  max-width: none;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 1rem + 2vw, 2.2rem);
  line-height: 1.08;
  letter-spacing: 0.05em;
  color: var(--white);
  border-bottom: var(--hair) solid var(--ink-600);
  padding-bottom: 0.75rem;
}

.footer-wordmark span {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.34em;
  color: var(--amber);
}

.footer-tag {
  max-width: none;
  margin-top: 0.8rem;
  font-size: 0.86rem;
  color: var(--lilac);
}

.footer-version {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  max-width: none;
  margin-top: 0.9rem;
  font-size: 0.78rem;
  color: var(--lilac);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem 1rem;
  align-content: start;
}

.footer-col-title {
  max-width: none;
  margin-bottom: 0.7rem;
  padding-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--cyan);
  border-bottom: var(--hair) solid var(--ink-600);
}

.footer-list li + li {
  margin-top: 0.15rem;
}

.footer-link {
  display: inline-block;
  padding: 0.22rem 0;
  font-size: 0.9rem;
  color: var(--mist);
  transition: color 0.15s ease, transform 0.15s ease;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-contact {
  align-self: start;
}

.contact-list li {
  display: grid;
  grid-template-columns: 3.1rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: start;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--ink-600);
}

.contact-key {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  line-height: 1.9;
  color: var(--lilac);
}

.contact-val {
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--white);
  overflow-wrap: anywhere;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  padding: 1.05rem clamp(1.05rem, 4vw, 3rem);
  background: var(--ink-800);
  border-top: var(--hair) solid var(--ink-600);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  line-height: 1.7;
  color: var(--lilac);
}

.footer-line,
.footer-copy {
  max-width: none;
}

.footer-copy {
  color: var(--ink-600);
}

/* ---------- 15. Responsive: tablet & desktop ---------- */
@media (min-width: 700px) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  html {
    scroll-padding-top: 1rem;
  }

  body {
    padding-left: var(--rail-w);
  }

  .site-header {
    position: fixed;
  }

  .scroll-progress {
    left: var(--rail-w);
    width: calc(100% - var(--rail-w));
  }
}

@media (min-width: 1000px) {
  .footer-inner {
    grid-template-columns: minmax(210px, 0.9fr) minmax(0, 1.9fr) minmax(240px, 1fr);
    gap: 2.5rem 2.5rem;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-contact {
    padding-left: 1.75rem;
    border-left: var(--hair) solid var(--ink-600);
  }
}

@media (max-width: 1199px) {
  :root {
    --rail-w: 88px;
  }
}

/* ---------- 16. Responsive: mobile drawer ---------- */
@media (max-width: 899px) {
  :root {
    --rail-w: 100%;
  }

  .site-header {
    position: sticky;
    top: 0;
    left: auto;
    right: auto;
    bottom: auto;
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: stretch;
    border-right: 0;
    border-bottom: var(--hair) solid var(--ink-600);
    box-shadow: 0 6px 0 rgba(0, 0, 0, 0.35);
  }

  .header-top {
    flex: 0 0 100%;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.6rem 1rem;
    border-bottom: 0;
  }

  .brand-link {
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
    text-align: left;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
    font-size: 1.05rem;
    box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.6);
  }

  .brand-name {
    font-size: 0.95rem;
    letter-spacing: 0.1em;
  }

  .brand-latin {
    font-size: 0.55rem;
  }

  .brand-tag {
    display: none;
  }

  .header-tools {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    order: 3;
    flex: 0 0 100%;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    background: var(--ink-900);
    transition: max-height 0.2s ease;
  }

  .site-nav[data-open="true"] {
    max-height: min(78vh, 620px);
    overflow-y: auto;
    border-top: var(--hair) solid var(--ink-600);
  }

  .nav-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    padding: 1px;
    background: var(--ink-600);
  }

  .nav-link {
    padding: 0.75rem 0.85rem;
    font-size: 0.88rem;
    text-align: left;
    background: var(--ink-800);
    border-left: 0;
  }

  .nav-link::before {
    display: inline;
    margin: 0 0.45em 0 0;
    font-size: 0.62rem;
  }

  .nav-link[aria-current="page"] {
    background: var(--ink-700);
    box-shadow: inset 3px 0 0 var(--cyan);
    border-left-color: transparent;
  }

  .rail-foot {
    display: none;
  }

  .footer-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-base {
    justify-content: flex-start;
  }
}

@media (max-width: 420px) {
  .footer-nav {
    grid-template-columns: 1fr;
  }

  .nav-list {
    grid-template-columns: 1fr;
  }
}

/* ---------- 17. Short viewport guard ---------- */
@media (min-width: 900px) and (max-height: 640px) {
  .brand-tag,
  .rail-note {
    display: none;
  }

  .nav-link {
    padding: 0.4rem 0.3rem;
    font-size: 0.72rem;
  }

  .nav-link::before {
    margin-bottom: 0.1rem;
    font-size: 0.54rem;
  }

  .rail-quick {
    padding: 0.3rem 0.2rem;
    font-size: 0.62rem;
  }
}

/* ---------- 18. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}