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

/* ===== tokens ===== */
:root {
  --ink: #06130F;
  --pine: #0B231C;
  --indigo: #2A2140;
  --wine: #5A1B2E;
  --cyan: #2BE8C6;
  --cyan-soft: #7FF3DE;
  --amber: #F2B03D;
  --ice: #F3F7F5;
  --moss: #9FB8B0;
  --graphite: #16211E;
  --deep: #03100C;

  --line: 3px;
  --rail-w: 0px;
  --header-h: 76px;
  --shell: 1320px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "DejaVu Sans Mono", monospace;

  --shadow-hard: 9px 9px 0 0 var(--deep);
  --shadow-lift: 12px 12px 0 0 var(--deep);
  --ease: cubic-bezier(.2, .7, .3, 1);
}
@media (min-width: 1180px) { :root { --rail-w: 60px; } }

/* ===== base ===== */
body {
  background: var(--ink);
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  padding-left: var(--rail-w);
  min-height: 100vh;
}
h1, h2, h3, h4 { line-height: 1.14; letter-spacing: -0.02em; font-weight: 900; }
h1 { font-size: clamp(2rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.5rem); }
h3 { font-size: clamp(1.12rem, 1.9vw, 1.45rem); }
#main-content { scroll-margin-top: calc(var(--header-h) + 18px); }

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

.skip-link {
  position: absolute;
  left: calc(var(--rail-w) + 10px);
  top: -120px;
  z-index: 200;
  background: var(--amber);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  padding: 10px 18px;
  border: var(--line) solid var(--graphite);
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 10px; }

/* ===== layout ===== */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 44px);
}
.section { padding-block: clamp(42px, 7vw, 92px); border-top: var(--line) solid var(--graphite); }
.section--ink { background: var(--ink); }
.section--pine {
  background: var(--pine);
  background-image: repeating-linear-gradient(90deg, rgba(43, 232, 198, .05) 0 1px, transparent 1px 108px);
}
.section--indigo {
  background: var(--indigo);
  background-image: repeating-linear-gradient(90deg, rgba(243, 247, 245, .05) 0 1px, transparent 1px 108px);
}
.section--wine {
  background: var(--wine);
  background-image: repeating-linear-gradient(-45deg, rgba(0, 0, 0, .16) 0 14px, transparent 14px 28px);
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 28px;
  flex-wrap: wrap;
  padding-bottom: 14px;
  margin-bottom: clamp(22px, 3.2vw, 40px);
  border-bottom: 1px solid var(--graphite);
}
.rule { height: var(--line); background: var(--graphite); border: 0; }

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.split { display: grid; gap: clamp(20px, 3.2vw, 44px); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 960px) {
  .split { grid-template-columns: 7fr 5fr; }
  .split--reverse { grid-template-columns: 5fr 7fr; }
  .split--even { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .span-4, .span-6, .span-8, .span-12 { grid-column: 1 / -1; }
}

/* ===== type helpers ===== */
.display { font-size: clamp(2.4rem, 7vw, 5.6rem); letter-spacing: -0.03em; line-height: .98; font-weight: 900; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--cyan);
}
.lead { font-size: clamp(1.02rem, 1.5vw, 1.25rem); color: var(--cyan-soft); line-height: 1.75; }
.muted { color: var(--moss); }
.prose p { max-width: 36em; margin-bottom: 1.1em; color: #DCE8E3; }
.prose p:last-child { margin-bottom: 0; }
.num { font-family: var(--font-mono); letter-spacing: .02em; font-variant-numeric: tabular-nums; }
.note-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .32em;
  color: var(--moss);
}

/* ===== components ===== */
.card {
  background: var(--pine);
  border: var(--line) solid var(--graphite);
  box-shadow: var(--shadow-hard);
  padding: clamp(16px, 2.3vw, 28px);
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease), transform .18s var(--ease);
}
.card:hover { border-color: var(--cyan); box-shadow: var(--shadow-lift); }
.panel { background: var(--ink); border: var(--line) solid var(--graphite); padding: clamp(16px, 2.3vw, 28px); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  padding: 4px 10px;
  border: 2px solid var(--graphite);
  background: var(--pine);
  color: var(--cyan);
}
.tag--amber { color: var(--amber); border-color: var(--amber); background: transparent; }
.tag--wine { color: var(--ice); border-color: var(--wine); background: var(--wine); }

.stat { border-left: var(--line) solid var(--cyan); padding-left: 14px; }
.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
  letter-spacing: .02em;
}
.stat__label { font-size: 13px; letter-spacing: .1em; color: var(--moss); }

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--line) solid var(--graphite);
  background-color: var(--pine);
  background-image: repeating-linear-gradient(135deg, rgba(43, 232, 198, .07) 0 12px, transparent 12px 24px);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px dashed rgba(43, 232, 198, .3);
  pointer-events: none;
}
.media-frame > img,
.media-frame > picture > img,
.media-frame > video { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--band { aspect-ratio: 21 / 9; }
.media-frame__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--moss);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  padding: 11px 18px;
  border: var(--line) solid var(--graphite);
  background: var(--pine);
  color: var(--ice);
  white-space: nowrap;
  transition: background .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease), transform .16s var(--ease), box-shadow .16s var(--ease);
}
.btn:hover { border-color: var(--cyan); color: var(--cyan-soft); }
.btn:active { transform: translate(2px, 2px); }
.btn--primary {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink);
  font-weight: 700;
  box-shadow: 5px 5px 0 0 var(--deep);
}
.btn--primary:hover { background: var(--cyan); border-color: var(--cyan); color: var(--ink); }
.btn--ghost { background: transparent; border-color: var(--cyan); color: var(--cyan); }
.btn--ghost:hover { background: rgba(43, 232, 198, .14); color: var(--cyan-soft); }
.btn--block { width: 100%; }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--moss);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumbs__item:not(:last-child)::after { content: "//"; color: rgba(43, 232, 198, .55); }
.breadcrumbs__item[aria-current="page"] { color: var(--cyan); }

.list-index { border-top: 2px solid var(--graphite); }
.list-index__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 12px 6px;
  border-bottom: 1px solid var(--graphite);
  transition: background .16s var(--ease), color .16s var(--ease);
}
.list-index__item:hover { background: rgba(43, 232, 198, .08); }

.tabs { display: block; }
.tabs__list {
  display: flex;
  align-items: stretch;
  gap: 0;
  overflow-x: auto;
  border: var(--line) solid var(--graphite);
  background: var(--pine);
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.tab {
  flex: 0 0 auto;
  scroll-snap-align: start;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--moss);
  border-right: 1px solid var(--graphite);
  transition: color .16s var(--ease), background .16s var(--ease);
}
.tab:hover { color: var(--cyan-soft); background: rgba(43, 232, 198, .08); }
.tab[aria-selected="true"] { background: var(--cyan); color: var(--ink); font-weight: 700; }
.tab-panel { padding-top: clamp(18px, 2.4vw, 30px); }

.accordion { border-top: var(--line) solid var(--graphite); }
.accordion__item { border-bottom: var(--line) solid var(--graphite); }
.accordion__trigger {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  text-align: left;
  padding: 18px clamp(14px, 2vw, 24px);
  background: var(--pine);
  color: var(--ice);
  font-weight: 700;
  font-size: clamp(1rem, 1.5vw, 1.14rem);
  transition: background .18s var(--ease), color .18s var(--ease);
}
.accordion__trigger:hover { background: #103026; color: var(--cyan-soft); }
.accordion__trigger::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--cyan);
}
.accordion__item[data-open] .accordion__trigger { color: var(--cyan); }
.accordion__item[data-open] .accordion__trigger::after { content: "−"; color: var(--amber); }
.accordion__panel {
  display: none;
  padding: 4px clamp(14px, 2vw, 24px) 22px;
  background: var(--ink);
  border-top: 1px solid var(--graphite);
}
.accordion__item[data-open] .accordion__panel { display: block; }
.accordion__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
  flex: 0 0 auto;
}

.switch {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  border: 2px solid var(--graphite);
  background: var(--pine);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}
.switch:hover { border-color: var(--cyan); }
.switch__track {
  position: relative;
  flex: 0 0 auto;
  width: 54px;
  height: 26px;
  border: 2px solid var(--graphite);
  background: var(--ink);
}
.switch__track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--moss);
  transition: transform .18s var(--ease), background .18s var(--ease);
}
.switch[aria-pressed="true"] { border-color: var(--cyan); }
.switch[aria-pressed="true"] .switch__track { background: rgba(43, 232, 198, .18); border-color: var(--cyan); }
.switch[aria-pressed="true"] .switch__track::after { transform: translateX(26px); background: var(--amber); }
.switch__label { font-size: 15px; line-height: 1.6; }

[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .42s var(--ease), transform .42s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ===== header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background: linear-gradient(180deg, #092019 0%, #06130F 100%);
  border-bottom: var(--line) solid var(--graphite);
  box-shadow: 0 8px 0 0 var(--deep);
}
.frame-rail {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 80;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0 22px;
  background: #040E0B;
  border-right: var(--line) solid var(--graphite);
}
@media (min-width: 1180px) { .frame-rail { display: flex; } }
.rail-brand {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-weight: 900;
  font-size: 13px;
  letter-spacing: .26em;
  color: var(--cyan);
}
.rail-ticks { display: flex; flex-direction: column; align-items: center; gap: 11px; }
.rail-tick {
  display: block;
  width: 12px;
  height: 3px;
  background: rgba(159, 184, 176, .38);
  transition: background .2s var(--ease), width .2s var(--ease);
}
.rail-tick.is-active { width: 22px; background: var(--amber); }
.rail-progress { position: relative; width: 5px; height: 120px; background: var(--graphite); }
.rail-progress__bar {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  background: var(--cyan);
}

.frame-top {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 24px);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  min-height: var(--header-h);
  padding: 10px clamp(14px, 3vw, 40px);
}
.brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 22px;
  border: var(--line) solid var(--graphite);
  box-shadow: 5px 5px 0 0 var(--deep);
  transition: background .18s var(--ease), transform .18s var(--ease);
}
.brand:hover .brand-mark { background: var(--amber); transform: translate(-1px, -1px); }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-weight: 900; font-size: 1.02rem; letter-spacing: .03em; }
.brand-tagline { font-family: var(--font-mono); font-size: 11px; letter-spacing: .22em; color: var(--moss); }

.top-nav {
  display: flex;
  align-items: stretch;
  margin-left: auto;
  border-left: 1px solid var(--graphite);
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--moss);
  border-right: 1px solid var(--graphite);
  transition: color .16s var(--ease), background .16s var(--ease);
}
.nav-num { font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em; color: rgba(159, 184, 176, .6); }
.nav-link:hover { color: var(--cyan-soft); background: rgba(43, 232, 198, .09); }
.nav-link:hover .nav-num { color: var(--cyan); }
.nav-link[aria-current="page"] { background: var(--cyan); color: var(--ink); font-weight: 700; }
.nav-link[aria-current="page"] .nav-num { color: var(--ink); }

.header-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; margin-left: clamp(6px, 1.4vw, 18px); }
@media (max-width: 1399px) { .header-actions__sync { display: none; } }

.nav-toggle {
  display: none;
  place-items: center;
  width: 46px;
  height: 46px;
  border: var(--line) solid var(--graphite);
  background: var(--pine);
}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 22px;
  height: 3px;
  background: var(--cyan);
  transition: transform .18s var(--ease), background .18s var(--ease), opacity .18s var(--ease);
}
.nav-toggle__bars { position: relative; }
.nav-toggle__bars::before { content: ""; position: absolute; top: -8px; left: 0; }
.nav-toggle__bars::after { content: ""; position: absolute; top: 8px; left: 0; }
.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(8px) rotate(45deg); background: var(--amber); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-8px) rotate(-45deg); background: var(--amber); }

@media (max-width: 1023px) {
  .nav-toggle { display: grid; }
  .top-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    margin-left: 0;
    border-left: 0;
    border-bottom: var(--line) solid var(--graphite);
    background: var(--pine);
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    padding: 8px 0 16px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s linear;
  }
  .site-header[data-open] .top-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav-link {
    display: flex;
    padding: 14px clamp(16px, 5vw, 28px);
    font-size: 15px;
    border-right: 0;
    border-bottom: 1px solid var(--graphite);
  }
  .nav-num { font-size: 12px; }
}
@media (max-width: 560px) {
  .brand-tagline { display: none; }
  .btn--primary { padding: 9px 12px; font-size: 12px; letter-spacing: .06em; box-shadow: 3px 3px 0 0 var(--deep); }
  .brand-mark { width: 40px; height: 40px; font-size: 20px; }
}

/* ===== footer ===== */
.site-footer {
  margin-top: clamp(32px, 5vw, 64px);
  background-color: var(--pine);
  background-image:
    repeating-linear-gradient(90deg, rgba(43, 232, 198, .05) 0 1px, transparent 1px 120px),
    repeating-linear-gradient(0deg, rgba(43, 232, 198, .04) 0 1px, transparent 1px 120px);
  border-top: var(--line) solid var(--graphite);
  padding-block: clamp(34px, 5vw, 64px) 0;
  color: var(--ice);
}
.footer-grid { display: grid; gap: clamp(24px, 3.4vw, 46px); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 720px) { .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1100px) { .footer-grid { grid-template-columns: 1.5fr .9fr .9fr .9fr; } }

.footer-brand { display: flex; flex-direction: column; gap: 14px; }
.footer-brand__logo { display: inline-flex; align-items: center; gap: 12px; }
.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 20px;
  border: var(--line) solid var(--graphite);
}
.footer-brand__name { font-weight: 900; font-size: 1.1rem; letter-spacing: .04em; }
.footer-brand__note { max-width: 34em; font-size: 14.5px; line-height: 1.85; color: var(--moss); }

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--cyan);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--graphite);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  display: inline-block;
  font-size: 14.5px;
  color: #D6E4DF;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.footer-links a:hover { color: var(--amber); border-bottom-color: var(--amber); }

.footer-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px 24px;
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(18px, 2.6vw, 30px);
  background: var(--indigo);
  border: var(--line) solid var(--graphite);
}
@media (min-width: 780px) { .footer-contact { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.contact-line { display: flex; flex-direction: column; gap: 6px; }
.contact-line__key { font-family: var(--font-mono); font-size: 11px; letter-spacing: .24em; color: var(--cyan); }
.contact-line__val { font-size: 15px; line-height: 1.7; color: var(--ice); word-break: break-word; }
.footer-contact__note {
  grid-column: 1 / -1;
  padding-top: 14px;
  border-top: 1px solid rgba(159, 184, 176, .26);
  font-size: 13px;
  color: var(--moss);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(24px, 3vw, 38px);
  padding-block: 18px 28px;
  border-top: var(--line) solid var(--graphite);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
}
.footer-legal__line { color: var(--moss); }
.footer-legal__copy { color: rgba(159, 184, 176, .82); }

/* ===== motion guard ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}