/* ==========================================================================
   优博看台 · 共享外壳样式 /assets/site.css
   夜间看台控制台：深墨绿底 / 荧光青信号 / 暖橙行动点 / 粗边框硬阴影
   ========================================================================== */

:root {
  --ink: #05110E;
  --pitch: #0B1F1A;
  --panel: #12352B;
  --cyan: #2FE6C8;
  --cyan-line: rgba(47, 230, 200, 0.28);
  --cyan-soft: rgba(47, 230, 200, 0.09);
  --orange: #FF8A3D;
  --bone: #F2F7F4;
  --mist: #9FB8AF;
  --mint: #C9F5EC;
  --alert: #FF5C5C;
  --gold: #FFC857;
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --wrap: 1240px;
  --gutter: 20px;
  --hard: 6px 6px 0 rgba(5, 17, 14, 0.92);
  --hard-cyan: 5px 5px 0 rgba(47, 230, 200, 0.9);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

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

body {
  margin: 0;
  background: var(--pitch);
  color: var(--bone);
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-family: var(--sans);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--bone);
}

h1 { font-size: clamp(34px, 5vw, 60px); }
h2 { font-size: clamp(26px, 3.4vw, 38px); letter-spacing: 0.03em; }
h3 { font-size: clamp(20px, 2.2vw, 26px); }

p { margin: 0 0 1em; }

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--mint); }

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

img, svg, picture { max-width: 100%; }
img { height: auto; }

button { font: inherit; }

hr { border: 0; }

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

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 跳转链接 ---------- */
.kit-skip {
  position: absolute;
  left: 14px;
  top: -96px;
  z-index: 300;
  padding: 12px 22px;
  background: var(--cyan);
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0.08em;
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--orange);
  transition: top 0.18s var(--ease);
}
.kit-skip:focus { top: 12px; color: var(--ink); }

/* ---------- 页头 ---------- */
.kit-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--pitch);
  border-bottom: 2px solid var(--cyan-line);
  box-shadow: 0 16px 34px rgba(3, 10, 8, 0.55);
}

.kit-progress {
  position: absolute;
  left: 0;
  bottom: -2px;
  z-index: 2;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width 0.12s linear;
  pointer-events: none;
}

/* 状态轨 */
.kit-rail {
  background: var(--ink);
  border-bottom: 1px solid rgba(47, 230, 200, 0.16);
}

.kit-rail-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 7px var(--gutter);
  min-height: 38px;
}

.kit-rail-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 230, 200, 0.16);
  animation: kit-breathe 2.8s var(--ease) infinite;
}

@keyframes kit-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.kit-rail-note {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
  white-space: nowrap;
}

.kit-rail-nav { margin-left: auto; }

.kit-rail-list {
  display: flex;
  align-items: center;
  gap: 22px;
}

.kit-rail-link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.kit-rail-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 工作台 */
.kit-deck {
  background: linear-gradient(180deg, #0C211B 0%, #0A1C17 100%);
}

.kit-deck-inner {
  display: flex;
  align-items: center;
  gap: 22px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 12px var(--gutter);
  min-height: 88px;
  transition: min-height 0.18s var(--ease), padding 0.18s var(--ease);
}

.kit-brand {
  display: flex;
  align-items: center;
  gap: 13px;
  flex: 0 0 auto;
  color: var(--bone);
  text-decoration: none;
}
.kit-brand:hover { color: var(--bone); }

.kit-brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.02em;
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 rgba(255, 138, 61, 0.92);
  transition: width 0.18s var(--ease), height 0.18s var(--ease), font-size 0.18s var(--ease);
}

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

.kit-brand-name {
  display: block;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1.1;
}

.kit-brand-sub {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--mist);
  white-space: nowrap;
}

.kit-quick {
  flex: 0 0 auto;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--orange);
  border: 2px solid var(--orange);
  background: rgba(255, 138, 61, 0.07);
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}
.kit-quick:hover {
  background: var(--orange);
  color: var(--ink);
}

/* 主导航 */
.kit-nav { margin-left: auto; }

.kit-nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.kit-nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--bone);
  border: 2px solid transparent;
  transition: color 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.kit-nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.18s var(--ease);
}

.kit-nav-link:hover {
  color: var(--cyan);
  background: var(--cyan-soft);
  border-color: var(--cyan-line);
}
.kit-nav-link:hover::after { transform: scaleX(1); }

.kit-nav-no {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--mist);
  transition: color 0.16s var(--ease);
}

.kit-nav-link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(47, 230, 200, 0.1);
  border-color: var(--cyan);
}
.kit-nav-link[aria-current="page"]::after { transform: scaleX(1); }
.kit-nav-link[aria-current="page"] .kit-nav-no { color: var(--orange); }

/* 移动导航按钮 */
.kit-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 14px;
  background: transparent;
  color: var(--bone);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.12em;
  border: 2px solid var(--cyan-line);
  cursor: pointer;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}
.kit-nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.kit-nav-toggle-bar {
  width: 18px;
  height: 2px;
  background: var(--cyan);
  box-shadow: 0 -6px 0 var(--cyan), 0 6px 0 var(--cyan);
  transition: box-shadow 0.16s var(--ease), background 0.16s var(--ease);
}
.kit-header[data-open] .kit-nav-toggle-bar {
  background: var(--orange);
  box-shadow: 0 -6px 0 var(--orange), 0 6px 0 var(--orange);
}

/* 滚动压缩 */
.kit-header[data-stuck] .kit-rail { display: none; }
.kit-header[data-stuck] .kit-deck-inner {
  min-height: 64px;
  padding-top: 8px;
  padding-bottom: 8px;
}
.kit-header[data-stuck] .kit-brand-mark {
  width: 38px;
  height: 38px;
  font-size: 15px;
}

/* 移动端固定操作条 */
.kit-dock { display: none; }

/* ---------- 页脚 ---------- */
.kit-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--ink);
  color: var(--mist);
  font-size: 14.5px;
  border-top: 3px solid var(--cyan);
}

.kit-footer::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 34%, var(--cyan) 68%, var(--orange));
  opacity: 0.95;
  pointer-events: none;
}

.kit-footer-top {
  display: grid;
  grid-template-columns: minmax(200px, 1.05fr) minmax(0, 1.7fr) minmax(250px, 1.05fr);
  gap: clamp(28px, 4vw, 52px);
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(44px, 5vw, 64px) var(--gutter) clamp(32px, 4vw, 48px);
}

.kit-footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.kit-footer-word {
  margin: 0 0 8px;
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 900;
  letter-spacing: 0.16em;
  line-height: 1.1;
  color: var(--bone);
}

.kit-footer-line {
  margin: 0 0 24px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.kit-feedback-link {
  display: inline-block;
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--cyan);
  background: transparent;
  border: 2px solid var(--cyan);
  box-shadow: 4px 4px 0 rgba(47, 230, 200, 0.18);
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}
.kit-feedback-link:hover {
  background: var(--cyan);
  color: var(--ink);
}

.kit-footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

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

.kit-footer-title {
  margin: 0 0 16px;
  padding-bottom: 8px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--bone);
  border-bottom: 2px solid rgba(47, 230, 200, 0.22);
}

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

.kit-footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.kit-footer-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.kit-contact-card {
  padding: 20px;
  background: var(--panel);
  border: 2px solid var(--cyan-line);
  box-shadow: var(--hard);
}

.kit-contact-title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.kit-contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 0;
  border-top: 1px solid rgba(47, 230, 200, 0.14);
}
.kit-contact-item:first-of-type { border-top: 0; padding-top: 0; }

.kit-contact-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.kit-contact-value {
  font-size: 14px;
  line-height: 1.6;
  color: var(--bone);
  word-break: break-word;
}

.kit-contact-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 2px solid rgba(47, 230, 200, 0.18);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.kit-footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px var(--gutter) 24px;
  border-top: 2px solid rgba(47, 230, 200, 0.18);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.kit-copy { margin: 0; }
.kit-icp { margin: 0; color: var(--mist); }

.kit-base-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-left: auto;
}

.kit-base-link {
  color: var(--mist);
  border-bottom: 1px solid rgba(159, 184, 175, 0.35);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.kit-base-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 返回顶部 */
.kit-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 95;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--panel);
  color: var(--cyan);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  border: 2px solid var(--cyan);
  box-shadow: 4px 4px 0 rgba(47, 230, 200, 0.2);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s var(--ease);
}
.kit-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.kit-top:hover { background: var(--cyan); color: var(--ink); }

/* ---------- 通用布局 ---------- */
.kit-container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.kit-section {
  padding: clamp(44px, 6vw, 84px) 0;
}
.kit-section + .kit-section {
  border-top: 2px solid rgba(47, 230, 200, 0.12);
}

.kit-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}
.kit-grid--split { grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr); }
.kit-grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.kit-grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 通用文本组件 ---------- */
.kit-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.26em;
  color: var(--orange);
}
.kit-kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--orange);
}

.kit-lede {
  max-width: 66ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.8;
  color: rgba(242, 247, 244, 0.86);
}

.kit-note {
  margin: 0 0 1.2em;
  padding: 14px 18px;
  border-left: 3px solid var(--orange);
  background: rgba(255, 138, 61, 0.07);
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.75;
}
.kit-note p:last-child { margin-bottom: 0; }

.kit-rule {
  height: 2px;
  margin: 28px 0;
  background: linear-gradient(90deg, var(--cyan), rgba(47, 230, 200, 0));
}

.kit-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--mono);
}
.kit-stat-value {
  font-size: clamp(32px, 4.6vw, 52px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}
.kit-stat-label {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.kit-tag {
  display: inline-block;
  padding: 4px 9px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  background: rgba(47, 230, 200, 0.08);
  border: 1px solid var(--cyan-line);
}
.kit-tag--orange {
  color: var(--orange);
  background: rgba(255, 138, 61, 0.08);
  border-color: rgba(255, 138, 61, 0.4);
}

.kit-panel {
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--panel);
  border: 2px solid var(--cyan-line);
  box-shadow: var(--hard);
}
.kit-panel > :last-child { margin-bottom: 0; }

/* ---------- 按钮 ---------- */
.kit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--cyan);
  background: transparent;
  border: 2px solid var(--cyan);
  cursor: pointer;
  transition: background 0.16s var(--ease), color 0.16s var(--ease), box-shadow 0.16s var(--ease), transform 0.16s var(--ease);
}
.kit-btn:hover {
  background: rgba(47, 230, 200, 0.12);
  color: var(--mint);
}
.kit-btn--solid {
  background: var(--cyan);
  color: var(--ink);
  border-color: var(--ink);
  box-shadow: 5px 5px 0 rgba(5, 17, 14, 0.7);
}
.kit-btn--solid:hover {
  background: var(--mint);
  color: var(--ink);
  box-shadow: 3px 3px 0 rgba(5, 17, 14, 0.7);
  transform: translate(2px, 2px);
}
.kit-btn--accent {
  background: var(--orange);
  color: var(--ink);
  border-color: var(--ink);
  box-shadow: 5px 5px 0 var(--cyan);
}
.kit-btn--accent:hover {
  background: var(--gold);
  color: var(--ink);
  box-shadow: 3px 3px 0 var(--cyan);
  transform: translate(2px, 2px);
}
.kit-btn--ghost {
  color: var(--bone);
  border-color: rgba(47, 230, 200, 0.35);
}
.kit-btn--ghost:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: transparent;
}

/* ---------- 面包屑 ---------- */
.kit-breadcrumb {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}
.kit-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.kit-breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.kit-breadcrumb li + li::before {
  content: "/";
  color: var(--cyan);
  opacity: 0.7;
}
.kit-breadcrumb a {
  color: var(--mist);
  border-bottom: 1px solid transparent;
}
.kit-breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 图片容器底座 ---------- */
.kit-media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #0E2A22;
  border: 2px solid var(--cyan-line);
}
.kit-media img,
.kit-media picture,
.kit-media svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.kit-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(155deg, rgba(47, 230, 200, 0.16), transparent 46%, rgba(255, 138, 61, 0.14));
  mix-blend-mode: screen;
}
.kit-media--wide { aspect-ratio: 21 / 9; }
.kit-media--square { aspect-ratio: 1 / 1; }
.kit-media--tall { aspect-ratio: 3 / 4; }

.kit-figure { margin: 0; }

.kit-figure-cap {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 数据表 ---------- */
.kit-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
.kit-table caption {
  padding-bottom: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
  text-align: left;
}
.kit-table th,
.kit-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid rgba(47, 230, 200, 0.16);
}
.kit-table thead th {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border-bottom: 2px solid var(--cyan-line);
}
.kit-table tbody tr:hover { background: rgba(47, 230, 200, 0.06); }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .kit-quick { display: none; }
  .kit-nav-link { font-size: 14px; padding: 9px 10px; }
  .kit-nav-link::after { left: 10px; right: 10px; }
}

@media (max-width: 1080px) {
  .kit-brand-sub { display: none; }
  .kit-footer-top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  }
  .kit-contact-card { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  :root { --gutter: 18px; }

  body { padding-bottom: 82px; }

  .kit-rail-nav { display: none; }
  .kit-rail-note { letter-spacing: 0.14em; font-size: 11px; }

  .kit-deck-inner {
    flex-wrap: wrap;
    gap: 10px 14px;
    padding: 12px var(--gutter);
    min-height: 0;
  }

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

  .kit-nav {
    display: none;
    flex: 1 0 100%;
    order: 3;
    margin: 0;
    padding-top: 10px;
    border-top: 2px solid var(--cyan-line);
  }
  .kit-header[data-open] .kit-nav { display: block; }

  .kit-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .kit-nav-list > li { border-bottom: 1px solid rgba(47, 230, 200, 0.12); }
  .kit-nav-list > li:last-child { border-bottom: 0; }

  .kit-nav-link {
    padding: 14px 6px;
    font-size: 16px;
    border: 0;
    border-left: 3px solid transparent;
  }
  .kit-nav-link::after { display: none; }
  .kit-nav-link:hover {
    background: rgba(47, 230, 200, 0.06);
    border-color: transparent;
    border-left-color: var(--cyan-line);
  }
  .kit-nav-link[aria-current="page"] {
    border: 0;
    border-left: 3px solid var(--cyan);
    background: rgba(47, 230, 200, 0.09);
  }

  .kit-header[data-stuck] .kit-rail { display: none; }

  .kit-grid--split,
  .kit-grid--halves,
  .kit-grid--thirds {
    grid-template-columns: minmax(0, 1fr);
  }

  .kit-dock {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom, 0px));
    background: var(--ink);
    border-top: 2px solid var(--cyan);
  }
  .kit-dock-link {
    display: block;
    padding: 12px 8px;
    text-align: center;
    font-size: 14.5px;
    font-weight: 800;
    letter-spacing: 0.1em;
    color: var(--bone);
    background: var(--panel);
    border: 2px solid var(--cyan-line);
  }
  .kit-dock-link:hover { color: var(--cyan); border-color: var(--cyan); }
  .kit-dock-link--accent {
    color: var(--ink);
    background: var(--orange);
    border-color: var(--ink);
    box-shadow: 3px 3px 0 var(--cyan);
  }
  .kit-dock-link--accent:hover { color: var(--ink); }

  .kit-top { bottom: 88px; right: 14px; padding: 10px 14px; font-size: 12.5px; }

  .kit-footer-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .kit-footer-cols { gap: 18px; }
  .kit-footer-base { flex-direction: column; align-items: flex-start; gap: 8px; }
  .kit-base-nav { margin-left: 0; }
}

@media (max-width: 600px) {
  :root { --gutter: 15px; }

  .kit-brand-mark { width: 40px; height: 40px; font-size: 15px; }
  .kit-brand-name { font-size: 19px; letter-spacing: 0.1em; }
  .kit-nav-toggle { padding: 9px 12px; font-size: 13px; }

  .kit-footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .kit-contact-card { padding: 16px; box-shadow: 4px 4px 0 rgba(5, 17, 14, 0.9); }
  .kit-footer-word { letter-spacing: 0.12em; }
}

/* ==========================================================================
   可访问性：减弱动效
   ========================================================================== */
@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;
  }
  .kit-rail-dot { animation: none; }
}