/* ============================================================
   博鱼服务 /assets/site.css
   深海潜航日志 × 桌面控制台 共享外壳
   ============================================================ */

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

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

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

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

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

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

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

[hidden] { display: none !important; }

::selection { background: #2FE3D0; color: #04121F; }

/* ---------- tokens ---------- */
:root {
  --abyss: #061A2B;
  --tide: #0B2A44;
  --ink: #04121F;
  --cyan: #2FE3D0;
  --cyan-soft: rgba(47, 227, 208, 0.16);
  --coral: #FF7A59;
  --gold: #F2B84B;
  --mist: #E8F1F7;
  --slate: #9DB4C6;
  --paper: #FFFFFF;
  --green: #4CD48A;

  --line: rgba(157, 180, 198, 0.18);
  --line-strong: rgba(157, 180, 198, 0.34);

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;

  --shell: 1200px;
  --gutter: 32px;

  --font-display: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: "HarmonyOS Sans SC", "Noto 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;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --step-12: 12px;
  --step-13: 13px;
  --step-16: 16px;
  --step-18: 18px;
  --step-24: 24px;
  --step-32: 32px;
  --step-48: 48px;
  --step-72: 72px;
}

/* ---------- 画布：水层剖面 ---------- */
body {
  min-height: 100vh;
  background-color: var(--abyss);
  background-image:
    radial-gradient(130% 90% at 88% -14%, rgba(47, 227, 208, 0.13), transparent 62%),
    radial-gradient(85% 62% at 0% 106%, rgba(255, 122, 89, 0.10), transparent 66%),
    repeating-linear-gradient(112deg, rgba(232, 241, 247, 0.028) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(6deg, rgba(232, 241, 247, 0.016) 0 1px, transparent 1px 168px);
  background-attachment: fixed;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
}

main { display: block; }

/* ---------- focus ---------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- skip link ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  transition: top 0.2s var(--ease);
}
.skip-link:focus-visible {
  top: 12px;
  color: var(--ink);
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: relative;
  z-index: 50;
}

/* 顶部进度条：青→橙深度标尺 */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 60;
  background: rgba(157, 180, 198, 0.10);
  pointer-events: none;
}
.progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--gold) 55%, var(--coral));
  transition: width 0.12s linear;
}

.masthead { position: relative; }

.masthead__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 16px 24px;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 20px var(--gutter) 14px;
  border-bottom: 1px solid var(--line);
}

.masthead__signature {
  grid-column: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--slate);
  white-space: nowrap;
}

.masthead__sig-en {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border: 1px solid rgba(47, 227, 208, 0.42);
  border-radius: var(--radius-pill);
  color: var(--cyan);
  font-size: 10px;
  letter-spacing: 0.18em;
}

.masthead__wordmark {
  grid-column: 2;
  justify-self: center;
  position: relative;
  padding-bottom: 4px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--mist);
  white-space: nowrap;
}
.masthead__wordmark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.18s var(--ease);
}
.masthead__wordmark:hover::after,
.masthead__wordmark:focus-visible::after { transform: scaleX(1); }

.masthead__aside {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 14px;
}

.masthead__status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(11, 42, 68, 0.62);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--slate);
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(76, 212, 138, 0.16);
  animation: boyu-pulse 3.6s ease-in-out infinite;
}
@keyframes boyu-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(76, 212, 138, 0.16); }
  50% { box-shadow: 0 0 0 8px rgba(76, 212, 138, 0.04); }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 8px 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  color: var(--mist);
  font-size: 14px;
  font-weight: 500;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease),
    background 0.2s var(--ease);
}
.nav-toggle:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background 0.2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: top 0.24s var(--ease), transform 0.24s var(--ease),
    opacity 0.2s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.site-header[data-open] .nav-toggle {
  border-color: var(--cyan);
  color: var(--cyan);
}
.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before {
  top: 0;
  transform: rotate(45deg);
}
.site-header[data-open] .nav-toggle__bars::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-nav {
  display: grid;
  grid-template-rows: 1fr;
  padding-inline: var(--gutter);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(8px, 2.2vw, 34px);
  max-width: calc(var(--shell) - var(--gutter) * 2);
  margin-inline: auto;
  padding: 12px 0 16px;
  counter-reset: navidx;
}

.site-nav__item { display: block; }

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 2px 14px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--slate);
  transition: color 0.18s var(--ease);
}
.site-nav__link::before {
  content: counter(navidx, decimal-leading-zero);
  counter-increment: navidx;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: rgba(157, 180, 198, 0.55);
  vertical-align: 2px;
  transition: color 0.18s var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 6px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.18s var(--ease);
}
.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--mist); }
.site-nav__link:hover::before,
.site-nav__link:focus-visible::before { color: var(--cyan); }
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] { color: var(--mist); }
.site-nav__link[aria-current="page"]::before { color: var(--cyan); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  margin-top: clamp(64px, 9vw, 120px);
  background-image: linear-gradient(180deg, rgba(6, 26, 43, 0.2), var(--ink) 58%);
  border-top: 1px solid var(--line);
}

.site-footer__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 72px) var(--gutter) 26px;
  display: grid;
  grid-template-columns: 1.15fr 0.75fr 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.footer-wordmark {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.2vw, 1.9rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--mist);
}

.footer-tagline {
  margin-top: 14px;
  max-width: 22ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--slate);
}

.footer-icp {
  margin-top: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(157, 180, 198, 0.72);
}

.footer-heading {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.footer-list {
  display: grid;
  gap: 2px;
}

.footer-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 14.5px;
  color: var(--mist);
  transition: color 0.18s var(--ease);
}
.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  bottom: 5px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.18s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible { color: var(--cyan); }
.footer-link:hover::after,
.footer-link:focus-visible::after { transform: scaleX(1); }

.footer-meta {
  display: grid;
  gap: 16px;
}

.footer-meta__item {
  display: grid;
  gap: 6px;
}

.footer-meta__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(157, 180, 198, 0.7);
}

.footer-meta__value {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--slate);
}

.copy-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  max-width: 100%;
  min-height: 44px;
  padding: 6px 8px 6px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(11, 42, 68, 0.6);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  text-align: left;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease),
    background 0.2s var(--ease);
}
.copy-chip:hover,
.copy-chip:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.copy-chip__text {
  overflow-wrap: anywhere;
}

.copy-chip__hint {
  flex: none;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--cyan-soft);
  color: var(--slate);
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.1em;
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.copy-chip[data-copied] {
  border-color: var(--green);
}
.copy-chip[data-copied] .copy-chip__hint {
  background: var(--green);
  color: #04220F;
}

.site-footer__legal {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 44px);
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: rgba(157, 180, 198, 0.8);
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

.legal-link {
  color: var(--slate);
  transition: color 0.18s var(--ease);
}
.legal-link:hover,
.legal-link:focus-visible { color: var(--cyan); }

.lang-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate);
}

/* ============================================================
   通用排版
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.display-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.4vw, 4.5rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.8vw, 2.5rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lede {
  max-width: 38ch;
  font-size: clamp(1rem, 1.25vw, 1.125rem);
  line-height: 1.8;
  color: var(--slate);
}

.prose {
  max-width: 38em;
  color: var(--slate);
}
.prose p + p { margin-top: 1.1em; }
.prose strong { color: var(--mist); font-weight: 600; }
.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(47, 227, 208, 0.4);
  transition: border-color 0.18s var(--ease);
}
.prose a:hover { border-color: var(--cyan); }

.rail-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--slate);
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.grid--12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 32px);
}
.grid--12 > * { grid-column: 1 / -1; }

@media (min-width: 901px) {
  .grid--12 > .span-3 { grid-column: span 3; }
  .grid--12 > .span-4 { grid-column: span 4; }
  .grid--12 > .span-5 { grid-column: span 5; }
  .grid--12 > .span-7 { grid-column: span 7; }
  .grid--12 > .span-8 { grid-column: span 8; }
}

/* ---------- 面板 ---------- */
.panel {
  padding: clamp(22px, 3vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(11, 42, 68, 0.92), rgba(6, 26, 43, 0.86));
}

.panel--flush {
  padding: 0;
  overflow: hidden;
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

/* ---------- 状态胶囊 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: rgba(232, 241, 247, 0.04);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.chip--cyan {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}
.chip--coral {
  background: var(--coral);
  border-color: var(--coral);
  color: #2B0D06;
}
.chip--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: #2A1A00;
}
.chip--green {
  background: var(--green);
  border-color: var(--green);
  color: #04220F;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  min-height: 48px;
  padding: 12px 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-align: center;
  transition: transform 0.18s var(--ease), background 0.2s var(--ease),
    color 0.2s var(--ease), border-color 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}

.btn--primary {
  background: var(--cyan);
  color: var(--ink);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 16px 34px rgba(47, 227, 208, 0.26);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--mist);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-4px);
}

/* ---------- 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}
.crumbs__link { color: var(--slate); transition: color 0.18s var(--ease); }
.crumbs__link:hover,
.crumbs__link:focus-visible { color: var(--cyan); }
.crumbs__sep { color: rgba(157, 180, 198, 0.42); }

/* ---------- 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background-image: linear-gradient(150deg, var(--tide), var(--abyss) 72%);
}
.media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(120% 90% at 82% 0%, rgba(47, 227, 208, 0.16), transparent 58%),
    radial-gradient(80% 70% at 0% 100%, rgba(255, 122, 89, 0.10), transparent 62%);
}
.media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 10px 18px;
  background: rgba(4, 18, 31, 0.74);
  border-top-right-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 4 / 5; }

/* ---------- 标签组 ---------- */
.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  width: fit-content;
  max-width: 100%;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(4, 18, 31, 0.5);
}

.tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 22px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--slate);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.tab:hover { color: var(--mist); }
.tab[aria-selected="true"] {
  background: var(--cyan);
  color: var(--ink);
}

.tab-panel { padding-top: 26px; }
.tab-panel:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 8px;
  border-radius: 6px;
}

/* ---------- 进入视口渐显 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
[data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
  .site-footer__brand {
    grid-column: 1 / -1;
  }
  .site-footer__legal {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .site-footer__brand,
  .site-footer__nav,
  .site-footer__contact,
  .site-footer__legal {
    grid-column: 1 / -1;
  }
  .site-footer__nav .footer-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 20px;
  }
}

@media (max-width: 860px) {
  .masthead__inner {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "sig toggle"
      "brand brand"
      "status status";
    gap: 12px;
    padding-top: 16px;
  }
  .masthead__signature { grid-area: sig; }
  .masthead__wordmark {
    grid-area: brand;
    justify-self: center;
    font-size: 1.6rem;
  }
  .masthead__aside { display: contents; }
  .masthead__status {
    grid-area: status;
    justify-self: center;
  }
  .nav-toggle {
    grid-area: toggle;
    display: inline-flex;
  }

  .site-nav {
    grid-template-rows: 0fr;
    visibility: hidden;
    transition: grid-template-rows 0.32s var(--ease), visibility 0.32s var(--ease);
  }
  .site-nav__list {
    overflow: hidden;
    min-height: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-width: 100%;
    padding: 0 0 8px;
  }
  .site-nav__link {
    display: block;
    padding: 15px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 15px;
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] { color: var(--cyan); }

  .site-header[data-open] .site-nav {
    grid-template-rows: 1fr;
    visibility: visible;
  }
}

@media (max-width: 700px) {
  .rail-note {
    writing-mode: horizontal-tb;
    letter-spacing: 0.14em;
  }
}

@media (max-width: 620px) {
  :root { --gutter: 20px; }

  body {
    font-size: 16px;
    background-attachment: scroll;
  }

  .masthead__status {
    font-size: 11.5px;
    padding: 6px 13px;
  }

  .display-title { font-size: clamp(2rem, 9vw, 2.7rem); }

  .site-footer__nav .footer-list { grid-template-columns: 1fr; }

  .site-footer__legal {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .legal-links { gap: 14px; }
}

/* ---------- 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;
  }

  .status-dot { animation: none; }

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

  .progress__bar { transition: none; }
}