/* ============================================================
   三公平台 · 共享站台样式 /assets/site.css
   墨渊蓝底 · 玻璃索引层 · 实色档案卡 · 朱砂与鎏金索引高亮
   ============================================================ */

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

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

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

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

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

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

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

table { border-collapse: collapse; }

:focus-visible {
  outline: 2px solid var(--cinnabar-lt);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 2. tokens ---------- */
:root {
  --ink-900: #060E18;
  --ink-800: #0B1A2B;
  --ink-700: #1B3149;
  --ink-600: #2E4A67;
  --paper: #F5F2EA;
  --paper-dim: #D8DEE4;
  --mist: #A9B6C2;
  --cinnabar: #C8322A;
  --cinnabar-lt: #E4695F;
  --gold: #C9A227;
  --jade: #4E8C86;

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

  --container: 1280px;
  --gutter: 24px;
  --rail-w: 220px;
  --path-h: 40px;
  --bar-h: 68px;
  --sg-header-h: 108px;

  --radius: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --line: 1px solid var(--ink-600);
  --line-soft: 1px solid rgba(46, 74, 103, 0.55);
}

/* ---------- 3. base & typography ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-800);
  background-image:
    radial-gradient(120% 80% at 86% -12%, rgba(46, 74, 103, 0.55), transparent 62%),
    radial-gradient(90% 60% at -6% 0%, rgba(27, 49, 73, 0.85), transparent 56%),
    repeating-linear-gradient(90deg, rgba(169, 182, 194, 0.045) 0 1px, transparent 1px 88px);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

p { max-width: 68ch; }

p + p { margin-top: 0.9em; }

strong, b { font-weight: 700; }

::selection {
  background: var(--cinnabar);
  color: var(--paper);
}

#main-content { scroll-margin-top: calc(var(--sg-header-h) + 16px); }

/* ---------- 4. type utilities ---------- */
.sg-display {
  font-size: clamp(2.4rem, 6vw, 5.2rem);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.sg-h2 {
  font-size: clamp(1.4rem, 2.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.sg-h3 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: 0.01em;
}

.sg-lead {
  max-width: 60ch;
  font-size: 1.03rem;
  line-height: 1.8;
  color: var(--paper-dim);
}

.sg-muted { color: var(--mist); }

.sg-mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.sg-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.sg-kicker::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--cinnabar);
}

/* ---------- 5. section & rhythm ---------- */
.sg-section {
  position: relative;
  padding: 56px 0;
}

.sg-section + .sg-section { padding-top: 40px; }

.sg-rule {
  position: relative;
  height: 1px;
  margin: 8px 0 28px;
  background: linear-gradient(90deg, var(--ink-600), transparent 78%);
}

.sg-rule::before {
  content: "";
  position: absolute;
  left: 0;
  top: -3px;
  width: 96px;
  height: 7px;
  background: repeating-linear-gradient(90deg, var(--cinnabar) 0 2px, transparent 2px 9px);
}

.sg-grid {
  display: grid;
  gap: 18px;
}

.sg-grid--cards { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.sg-grid--split { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

/* ---------- 6. header ---------- */
.sg-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 14, 24, 0.94);
  border-bottom: 1px solid var(--ink-600);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.sg-skip {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 90;
  padding: 10px 18px;
  background: var(--paper);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius);
  transition: top 0.2s var(--ease);
}

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

.sg-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cinnabar), var(--gold));
  transition: width 0.12s linear;
  z-index: 2;
}

/* 路径条 */
.sg-pathbar {
  background: linear-gradient(90deg, rgba(27, 49, 73, 0.72), rgba(6, 14, 24, 0.28) 70%);
  border-bottom: var(--line-soft);
}

.sg-pathbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--container);
  min-height: var(--path-h);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.sg-path { min-width: 0; overflow: hidden; }

.sg-path__list {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.sg-path__list::-webkit-scrollbar { display: none; }

.sg-path__item {
  display: inline-flex;
  align-items: center;
}

.sg-path__link {
  color: var(--mist);
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.sg-path__link:hover {
  color: var(--paper);
  border-bottom-color: var(--cinnabar);
}

.sg-path__sep { color: var(--ink-600); }

.sg-path__current { color: var(--paper); }

.sg-path__section { color: var(--gold); }

.sg-pathbar__tools {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: none;
}

.sg-tool {
  padding: 5px 10px;
  border: 1px solid rgba(46, 74, 103, 0.9);
  border-radius: var(--radius);
  background: rgba(11, 26, 43, 0.6);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.5;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.sg-tool:hover {
  color: var(--paper);
  border-color: var(--cinnabar);
  background: rgba(200, 50, 42, 0.14);
}

.sg-tool[data-copied="true"] {
  color: var(--jade);
  border-color: var(--jade);
}

/* 主命令栏 */
.sg-bar { background: rgba(11, 26, 43, 0.82); }

.sg-bar__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: var(--container);
  min-height: var(--bar-h);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.sg-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.sg-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--paper);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
}

.sg-brand__mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid var(--cinnabar);
  border-radius: 1px;
}

.sg-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.sg-brand__name {
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.sg-brand__sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--mist);
}

.sg-nav { margin-left: auto; min-width: 0; }

.sg-nav__list {
  display: flex;
  align-items: stretch;
  gap: 2px;
}

.sg-nav__item { display: flex; }

.sg-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 12px;
  border-radius: var(--radius);
  color: var(--mist);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.sg-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-600);
  transition: color 0.2s var(--ease);
}

.sg-nav__label { display: inline-block; }

.sg-nav__link:hover {
  color: var(--paper);
  background: rgba(46, 74, 103, 0.4);
}

.sg-nav__link:hover .sg-nav__num { color: var(--gold); }

.sg-nav__link[aria-current="page"] {
  color: var(--paper);
  background: rgba(200, 50, 42, 0.16);
}

.sg-nav__link[aria-current="page"] .sg-nav__num { color: var(--cinnabar-lt); }

.sg-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--cinnabar);
}

/* 移动端切换按钮 */
.sg-navtoggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.sg-navtoggle:hover { border-color: var(--cinnabar); }

.sg-navtoggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.sg-navtoggle__bars i {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--cinnabar);
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.sg-header[data-open] .sg-navtoggle { border-color: var(--cinnabar); }

.sg-header[data-open] .sg-navtoggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.sg-header[data-open] .sg-navtoggle__bars i:nth-child(2) { opacity: 0; }
.sg-header[data-open] .sg-navtoggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 7. buttons ---------- */
.sg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
  background: rgba(27, 49, 73, 0.7);
  color: var(--paper);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.sg-btn:hover { border-color: var(--cinnabar); transform: translateY(-2px); }

.sg-btn--primary {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
}

.sg-btn--primary:hover {
  background: var(--cinnabar-lt);
  border-color: var(--cinnabar-lt);
}

.sg-btn--ghost { background: transparent; }

.sg-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius);
  background: var(--cinnabar);
  color: var(--paper);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.sg-cta:hover { background: var(--cinnabar-lt); }

.sg-cta--sm {
  padding: 5px 12px;
  font-size: 12.5px;
  line-height: 1.6;
}

/* ---------- 8. cards & markers ---------- */
.sg-card {
  position: relative;
  padding: 22px;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--ink-700);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease), background 0.24s var(--ease);
}

.sg-card:hover {
  border-color: var(--cinnabar);
  transform: translateY(-3px);
}

.sg-card--glass {
  background: rgba(27, 49, 73, 0.45);
  border-color: rgba(169, 182, 194, 0.18);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.sg-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.sg-ref {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border: 1px solid rgba(200, 50, 42, 0.5);
  border-radius: var(--radius);
  background: rgba(200, 50, 42, 0.1);
  color: var(--cinnabar-lt);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.sg-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.sg-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
}

.sg-status--ok { color: var(--jade); }
.sg-status--ok::before { background: var(--jade); }

/* ---------- 9. shell & index rail ---------- */
.sg-shell {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.sg-rail {
  position: sticky;
  top: calc(var(--sg-header-h) + 20px);
  padding: 28px 0 32px;
}

.sg-rail__title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.sg-rail__list {
  display: grid;
  gap: 2px;
  border-left: 1px solid var(--ink-600);
}

.sg-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-left: -1px;
  padding: 8px 10px 8px 14px;
  border-left: 2px solid transparent;
  color: var(--mist);
  font-size: 13.5px;
  line-height: 1.5;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.sg-rail__link:hover {
  color: var(--paper);
  background: rgba(27, 49, 73, 0.65);
}

.sg-rail__link[aria-current="true"] {
  color: var(--paper);
  border-left-color: var(--cinnabar);
  background: rgba(200, 50, 42, 0.12);
}

.sg-rail__code {
  flex: none;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.sg-rail__search {
  margin-top: 16px;
  padding: 12px;
  border: 1px dashed var(--ink-600);
  border-radius: var(--radius);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  line-height: 1.7;
}

/* ---------- 10. figure / image container ---------- */
.sg-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.sg-figure::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 22px;
  height: 22px;
  background:
    linear-gradient(90deg, var(--cinnabar) 0 1px, transparent 1px) 0 0 / 8px 8px no-repeat,
    linear-gradient(0deg, var(--cinnabar) 0 1px, transparent 1px) 0 0 / 8px 8px no-repeat;
  opacity: 0.85;
  pointer-events: none;
}

.sg-figure__media {
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: var(--ratio, 16 / 9);
  background-color: var(--ink-800);
  background-image:
    linear-gradient(135deg, rgba(46, 74, 103, 0.78), rgba(6, 14, 24, 0.94)),
    repeating-linear-gradient(45deg, rgba(169, 182, 194, 0.07) 0 1px, transparent 1px 14px);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-align: center;
  text-transform: uppercase;
}

.sg-figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sg-figure__caption {
  padding: 10px 14px;
  border-top: var(--line-soft);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.7;
}

/* ---------- 11. accordion ---------- */
.sg-accordion { display: grid; gap: 10px; }

.sg-accordion__item {
  border: var(--line);
  border-radius: var(--radius);
  background: rgba(27, 49, 73, 0.5);
  transition: border-color 0.24s var(--ease);
}

.sg-accordion__item:hover { border-color: var(--ink-600); }

.sg-accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 15px 18px;
  color: var(--paper);
  font-size: 15.5px;
  font-weight: 700;
  text-align: left;
}

.sg-accordion__trigger::after {
  content: "+";
  flex: none;
  color: var(--cinnabar-lt);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  transition: transform 0.24s var(--ease);
}

.sg-accordion__trigger[aria-expanded="true"]::after { transform: rotate(45deg); }

.sg-accordion__panel {
  padding: 0 18px 18px;
  color: var(--paper-dim);
  font-size: 15px;
  line-height: 1.8;
}

.sg-accordion__panel[hidden] { display: none; }

/* ---------- 12. tabs ---------- */
.sg-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: var(--line);
}

.sg-tabs__btn {
  padding: 10px 16px;
  border-bottom: 2px solid transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.sg-tabs__btn:hover { color: var(--paper); }

.sg-tabs__btn[aria-selected="true"] {
  color: var(--paper);
  border-bottom-color: var(--cinnabar);
  background: rgba(200, 50, 42, 0.12);
}

.sg-tabs__panel { padding: 20px 0; }
.sg-tabs__panel[hidden] { display: none; }

/* ---------- 13. table ---------- */
.sg-table {
  width: 100%;
  border: var(--line);
  border-radius: var(--radius);
  font-size: 14.5px;
  line-height: 1.7;
}

.sg-table th {
  padding: 12px 14px;
  border-bottom: var(--line);
  background: var(--ink-700);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-align: left;
}

.sg-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(46, 74, 103, 0.6);
  color: var(--paper-dim);
}

.sg-table tr:nth-child(even) td { background: rgba(27, 49, 73, 0.38); }

.sg-table tr:last-child td { border-bottom: 0; }

/* ---------- 14. reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 0.32s var(--ease),
    transform 0.32s var(--ease);
}

[data-reveal].is-inview {
  opacity: 1;
  transform: none;
}

/* ---------- 15. footer ---------- */
.sg-footer {
  position: relative;
  margin-top: 72px;
  background: var(--ink-900);
  border-top: 1px solid var(--ink-600);
}

.sg-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cinnabar), var(--gold) 42%, transparent 82%);
}

.sg-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 0.8fr));
  gap: 32px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 52px var(--gutter) 34px;
}

.sg-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.sg-footer__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
  background: var(--ink-700);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.sg-footer__mark:hover {
  border-color: var(--cinnabar);
  background: rgba(200, 50, 42, 0.16);
}

.sg-footer__name {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.sg-footer__line {
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
}

.sg-footer__note {
  max-width: 34ch;
  margin-top: 4px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
}

.sg-footer__col { min-width: 0; }

.sg-footer__coltitle {
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(46, 74, 103, 0.6);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: 0.16em;
}

.sg-footer__links {
  display: grid;
  gap: 9px;
  font-size: 14px;
}

.sg-footer__link {
  display: inline-block;
  color: #C7CFD8;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.sg-footer__link::before {
  content: "→";
  margin-right: 8px;
  color: var(--cinnabar);
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}

.sg-footer__link:hover {
  color: var(--paper);
  transform: translateX(2px);
}

.sg-footer__link:hover::before { opacity: 1; }

.sg-footer__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 40px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 22px var(--gutter) 26px;
  border-top: 1px solid rgba(46, 74, 103, 0.6);
}

.sg-footer__contact .sg-footer__coltitle {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.sg-footer__contactlist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  font-size: 13.5px;
}

.sg-footer__contact-item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--paper-dim);
}

.sg-footer__contact-key {
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
}

.sg-footer__contact-val {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.sg-footer__tip {
  flex: 1 1 260px;
  color: var(--mist);
  font-size: 12.5px;
  line-height: 1.7;
}

.sg-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gutter) 30px;
  border-top: 1px solid rgba(46, 74, 103, 0.6);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.sg-footer__legal { color: var(--mist); }

.sg-footer__base-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.sg-footer__base-link {
  color: var(--mist);
  transition: color 0.2s var(--ease);
}

.sg-footer__base-link:hover { color: var(--cinnabar-lt); }

/* ---------- 16. responsive ---------- */
@media (max-width: 1180px) {
  .sg-footer__grid { grid-template-columns: 1.2fr repeat(3, minmax(0, 0.9fr)); gap: 26px; }
}

@media (max-width: 1080px) {
  .sg-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
  .sg-rail { display: none; }
}

@media (max-width: 960px) {
  :root {
    --path-h: 38px;
    --bar-h: 60px;
    --sg-header-h: 98px;
    --gutter: 18px;
  }

  body { font-size: 16px; }

  .sg-navtoggle { display: inline-flex; }

  .sg-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    margin: 0;
    padding: 8px var(--gutter) 18px;
    max-height: calc(100vh - var(--sg-header-h) - 12px);
    overflow-y: auto;
    background: rgba(6, 14, 24, 0.985);
    border-bottom: 1px solid var(--ink-600);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  }

  .sg-header[data-open] .sg-nav { display: block; }

  .sg-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .sg-nav__item { width: 100%; }

  .sg-nav__link {
    width: 100%;
    padding: 14px 10px;
    border-bottom: 1px solid rgba(46, 74, 103, 0.45);
    border-radius: 0;
    font-size: 16px;
  }

  .sg-nav__num { font-size: 10.5px; }

  .sg-nav__link[aria-current="page"] { background: rgba(200, 50, 42, 0.14); }

  .sg-nav__link[aria-current="page"]::after {
    left: 10px;
    right: auto;
    bottom: 9px;
    width: 26px;
  }

  .sg-brand__mark { width: 34px; height: 34px; font-size: 13px; }
  .sg-brand__name { font-size: 16px; }
  .sg-brand__sub { font-size: 9.5px; letter-spacing: 0.12em; }

  .sg-path__list { font-size: 10.5px; gap: 6px; }
  .sg-tool { font-size: 10px; padding: 4px 8px; }

  .sg-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 40px var(--gutter) 28px;
    gap: 24px;
  }
  .sg-footer__brand { grid-column: 1 / -1; }
  .sg-footer__contact { padding: 20px var(--gutter) 22px; }
  .sg-footer__base { padding: 14px var(--gutter) 26px; }

  .sg-section { padding: 44px 0; }
}

@media (max-width: 620px) {
  .sg-tool--copy { display: none; }
  .sg-pathbar__tools { gap: 4px; }
  .sg-cta--sm { padding: 5px 10px; font-size: 12px; }
  .sg-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .sg-footer__base { flex-direction: column; align-items: flex-start; }
  .sg-card { padding: 18px; }
  .sg-display { letter-spacing: -0.02em; }
}

/* ---------- 17. reduced motion ---------- */
@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] {
    opacity: 1;
    transform: none;
  }
}