/* ============================================================
   8868看台 · /assets/site.css
   共享层：重置 / 变量 / 中文排版 / 页头页脚 / 按钮 / 面包屑 /
   容器 / 蓝图网格 / 基础组件 / 响应式 / 无障碍
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: #06100C;
  background-image:
    linear-gradient(to right, rgba(20, 42, 32, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 42, 32, 0.55) 1px, transparent 1px);
  background-size: 120px 120px;
  background-attachment: fixed;
  color: #F3F8EF;
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-size: 17px;
  line-height: 1.8;
  font-weight: 400;
  overflow-x: hidden;
}

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

ul, ol { margin: 0; padding: 0; }

h1, h2, h3, h4, h5, h6 {
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 5.4vw, 72px); }
h2 { font-size: clamp(26px, 3.4vw, 42px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: clamp(18px, 1.6vw, 21px); }

p { max-width: 72ch; }

a {
  color: #C8FF3F;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { color: #7FE000; }

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

button { font: inherit; color: inherit; }

::selection {
  background: #C8FF3F;
  color: #06100C;
}

:focus-visible {
  outline: 3px solid #C8FF3F;
  outline-offset: 3px;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  --kt-ink: #06100C;
  --kt-surface: #0C1B15;
  --kt-grid-line: #142A20;
  --kt-edge: #254235;

  --kt-lime: #C8FF3F;
  --kt-lime-2: #7FE000;
  --kt-orange: #FF8A3D;

  --kt-text: #F3F8EF;
  --kt-muted: #9CB3A6;

  --kt-shell: 1440px;
  --kt-gap: 24px;
  --kt-radius: 0;

  --kt-shadow: 8px 8px 0 #142A20;
  --kt-shadow-sm: 4px 4px 0 #142A20;

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

  --kt-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --kt-fast: 180ms;
  --kt-mid: 260ms;
}

/* ---------- 3. 共享布局 ---------- */
.kt-main {
  display: block;
  min-height: 60vh;
}

.kt-shell {
  width: 100%;
  max-width: var(--kt-shell);
  margin-inline: auto;
  padding-inline: 24px;
}

.kt-section {
  padding-block: 56px;
  border-top: 1px solid var(--kt-grid-line);
}

.kt-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: 32px;
}

.kt-section__title {
  margin: 0;
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

.kt-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--kt-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--kt-lime);
}

.kt-eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--kt-lime);
  flex: 0 0 auto;
}

.kt-rule {
  border: 0;
  border-top: 1px solid var(--kt-grid-line);
  margin: 0;
  width: 100%;
}

/* ---------- 4. 蓝图网格 ---------- */
.kt-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--kt-gap);
  align-items: start;
}

.kt-col-3 { grid-column: span 3; }
.kt-col-4 { grid-column: span 4; }
.kt-col-5 { grid-column: span 5; }
.kt-col-6 { grid-column: span 6; }
.kt-col-7 { grid-column: span 7; }
.kt-col-8 { grid-column: span 8; }
.kt-col-9 { grid-column: span 9; }
.kt-col-12 { grid-column: span 12; }

/* ---------- 5. 面板 / 标签 / 数字 ---------- */
.kt-panel {
  background: var(--kt-surface);
  border: 2px solid var(--kt-edge);
  box-shadow: var(--kt-shadow);
  padding: 24px;
  position: relative;
}

.kt-panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 20px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--kt-grid-line);
}

.kt-panel__title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--kt-text);
}

.kt-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--kt-edge);
  color: var(--kt-muted);
  background: transparent;
  font-family: var(--kt-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  line-height: 1.5;
  text-transform: uppercase;
  white-space: nowrap;
}

.kt-tag--lime {
  border-color: var(--kt-lime);
  color: var(--kt-lime);
}

.kt-tag--orange {
  border-color: var(--kt-orange);
  color: var(--kt-orange);
}

.kt-num {
  font-family: var(--kt-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  font-feature-settings: "tnum" 1;
}

/* ---------- 6. 按钮 ---------- */
.kt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 12px 22px;
  border: 2px solid var(--kt-lime);
  background: var(--kt-lime);
  color: var(--kt-ink);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 6px 6px 0 var(--kt-edge);
  transition: transform var(--kt-fast) var(--kt-ease),
              box-shadow var(--kt-fast) var(--kt-ease),
              background-color var(--kt-fast) var(--kt-ease),
              border-color var(--kt-fast) var(--kt-ease),
              color var(--kt-fast) var(--kt-ease);
}

.kt-btn:hover {
  background: var(--kt-lime-2);
  border-color: var(--kt-lime-2);
  color: var(--kt-ink);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--kt-edge);
}

.kt-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--kt-edge);
}

.kt-btn--ghost {
  background: transparent;
  color: var(--kt-text);
  border-color: var(--kt-edge);
}

.kt-btn--ghost:hover {
  background: var(--kt-surface);
  color: var(--kt-lime);
  border-color: var(--kt-lime);
}

/* ---------- 7. 面包屑 ---------- */
.kt-crumb {
  padding-block: 14px;
  border-bottom: 1px solid var(--kt-grid-line);
  background: rgba(6, 16, 12, 0.6);
}

.kt-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--kt-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--kt-muted);
}

.kt-crumb__item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.kt-crumb__item + .kt-crumb__item::before {
  content: "/";
  color: var(--kt-edge);
}

.kt-crumb__link {
  color: var(--kt-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--kt-fast) var(--kt-ease), border-color var(--kt-fast) var(--kt-ease);
}

.kt-crumb__link:hover,
.kt-crumb__link:focus-visible {
  color: var(--kt-lime);
  border-bottom-color: var(--kt-lime);
}

.kt-crumb__now {
  color: var(--kt-lime);
}

/* ---------- 8. 图片容器（页面阶段放图占位） ---------- */
.kt-media {
  margin: 0;
  display: block;
  border: 2px solid var(--kt-edge);
  background: var(--kt-surface);
  overflow: hidden;
}

.kt-media__frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: #0C1B15;
  background-image:
    linear-gradient(to right, rgba(37, 66, 53, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(37, 66, 53, 0.6) 1px, transparent 1px),
    linear-gradient(135deg, rgba(200, 255, 63, 0.08), transparent 60%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

.kt-media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.kt-media__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--kt-grid-line);
  font-family: var(--kt-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--kt-muted);
}

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

/* ---------- 9. 标签页（前端筛选） ---------- */
.kt-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
  padding: 0;
}

.kt-tabs__btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 16px;
  border: 2px solid var(--kt-edge);
  background: var(--kt-surface);
  color: var(--kt-text);
  font-family: var(--kt-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color var(--kt-fast) var(--kt-ease),
              border-color var(--kt-fast) var(--kt-ease),
              color var(--kt-fast) var(--kt-ease);
}

.kt-tabs__btn:hover {
  border-color: var(--kt-lime);
  color: var(--kt-lime);
}

.kt-tabs__btn.is-active,
.kt-tabs__btn[aria-selected="true"] {
  background: var(--kt-lime);
  border-color: var(--kt-lime);
  color: var(--kt-ink);
}

.kt-tabpanel[hidden] { display: none; }

/* ---------- 10. 显现与进度条 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 320ms var(--kt-ease), transform 320ms var(--kt-ease);
  will-change: opacity, transform;
}

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

.kt-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 120;
  pointer-events: none;
  background: rgba(20, 42, 32, 0.9);
}

.kt-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--kt-lime-2), var(--kt-lime) 60%, var(--kt-orange));
  transition: width 100ms linear;
}

/* ---------- 11. 跳至正文 ---------- */
.kt-skip {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  display: inline-block;
  padding: 12px 20px;
  background: var(--kt-lime);
  color: var(--kt-ink);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 2px solid var(--kt-lime);
  transition: top var(--kt-fast) var(--kt-ease);
}

.kt-skip:focus,
.kt-skip:focus-visible {
  top: 12px;
  color: var(--kt-ink);
}

/* ---------- 12. 页头 ---------- */
.kt-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--kt-ink);
  border-bottom: 2px solid var(--kt-edge);
  box-shadow: 0 1px 0 0 var(--kt-grid-line) inset;
}

.kt-header::before {
  content: "";
  position: absolute;
  left: 24px;
  bottom: -2px;
  width: 88px;
  height: 3px;
  background: var(--kt-lime);
  pointer-events: none;
}

.kt-header__grid {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  max-width: var(--kt-shell);
  margin-inline: auto;
  padding: 12px 24px;
}

.kt-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.kt-brand__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--kt-text);
  transition: color var(--kt-fast) var(--kt-ease);
}

.kt-brand__link:hover { color: var(--kt-lime); }

.kt-brand__mark {
  display: inline-block;
  padding: 3px 7px;
  background: var(--kt-lime);
  color: var(--kt-ink);
  font-family: var(--kt-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.35;
}

.kt-brand__name {
  font-family: var(--kt-font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.kt-brand__tag {
  padding-left: 14px;
  border-left: 1px solid var(--kt-edge);
  font-family: var(--kt-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--kt-muted);
  white-space: nowrap;
}

/* 导航 */
.kt-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.kt-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.kt-nav__item { display: flex; }

.kt-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 11px;
  border: 2px solid transparent;
  color: var(--kt-text);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--kt-fast) var(--kt-ease),
              border-color var(--kt-fast) var(--kt-ease),
              color var(--kt-fast) var(--kt-ease);
}

.kt-nav__num {
  font-family: var(--kt-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--kt-muted);
  transition: color var(--kt-fast) var(--kt-ease);
}

.kt-nav__text { display: inline-block; }

.kt-nav__link:hover,
.kt-nav__link:focus-visible {
  background: var(--kt-surface);
  border-color: var(--kt-edge);
  color: var(--kt-lime);
}

.kt-nav__link:hover .kt-nav__num,
.kt-nav__link:focus-visible .kt-nav__num {
  color: var(--kt-orange);
}

.kt-nav__link[aria-current="page"] {
  background: var(--kt-lime);
  border-color: var(--kt-lime);
  color: var(--kt-ink);
}

.kt-nav__link[aria-current="page"] .kt-nav__num {
  color: var(--kt-edge);
}

.kt-nav__link[aria-current="page"]:hover {
  background: var(--kt-lime-2);
  border-color: var(--kt-lime-2);
  color: var(--kt-ink);
}

.kt-nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-left: 12px;
  padding: 9px 16px;
  min-height: 42px;
  background: var(--kt-lime);
  color: var(--kt-ink);
  border: 2px solid var(--kt-lime);
  box-shadow: var(--kt-shadow-sm);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: transform var(--kt-fast) var(--kt-ease),
              box-shadow var(--kt-fast) var(--kt-ease),
              background-color var(--kt-fast) var(--kt-ease),
              border-color var(--kt-fast) var(--kt-ease);
}

.kt-nav__cta::after {
  content: "→";
  font-family: var(--kt-font-mono);
  font-size: 13px;
}

.kt-nav__cta:hover,
.kt-nav__cta:focus-visible {
  background: var(--kt-lime-2);
  border-color: var(--kt-lime-2);
  color: var(--kt-ink);
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 var(--kt-edge);
}

/* 移动导航按钮 */
.kt-navbtn {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 9px 14px;
  background: var(--kt-surface);
  color: var(--kt-text);
  border: 2px solid var(--kt-edge);
  font-family: var(--kt-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: border-color var(--kt-fast) var(--kt-ease), color var(--kt-fast) var(--kt-ease);
}

.kt-navbtn:hover,
.kt-navbtn:focus-visible {
  border-color: var(--kt-lime);
  color: var(--kt-lime);
}

.kt-navbtn__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background-color var(--kt-fast) var(--kt-ease);
}

.kt-navbtn__bars::before,
.kt-navbtn__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--kt-fast) var(--kt-ease);
}

.kt-navbtn__bars::before { top: -6px; }
.kt-navbtn__bars::after { top: 6px; }

.kt-navbtn[aria-expanded="true"] .kt-navbtn__bars { background: transparent; }
.kt-navbtn[aria-expanded="true"] .kt-navbtn__bars::before { transform: translateY(6px) rotate(45deg); }
.kt-navbtn[aria-expanded="true"] .kt-navbtn__bars::after { transform: translateY(-6px) rotate(-45deg); }

.kt-navbtn__label { display: inline-block; }

/* ---------- 13. 页脚 ---------- */
.kt-footer {
  position: relative;
  margin-top: 72px;
  background: var(--kt-surface);
  border-top: 2px solid var(--kt-edge);
  color: var(--kt-text);
  font-size: 15px;
}

.kt-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 24px;
  width: 88px;
  height: 3px;
  background: var(--kt-orange);
  pointer-events: none;
}

.kt-footer__inner {
  width: 100%;
  max-width: var(--kt-shell);
  margin-inline: auto;
  padding: 56px 24px 32px;
}

.kt-footer__index {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--kt-gap);
  padding-bottom: 36px;
  border-bottom: 1px solid var(--kt-grid-line);
}

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

.kt-footer__title {
  margin: 0 0 14px;
  font-family: var(--kt-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--kt-muted);
}

.kt-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.kt-footer__link {
  color: var(--kt-text);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--kt-fast) var(--kt-ease), border-color var(--kt-fast) var(--kt-ease);
  overflow-wrap: anywhere;
}

.kt-footer__link:hover,
.kt-footer__link:focus-visible {
  color: var(--kt-lime);
  border-bottom-color: var(--kt-lime);
}

.kt-footer__contact {
  padding-block: 32px;
  border-bottom: 1px solid var(--kt-grid-line);
}

.kt-footer__info {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px 32px;
}

.kt-footer__info-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
  font-size: 15px;
  color: var(--kt-text);
}

.kt-footer__key {
  font-family: var(--kt-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--kt-orange);
}

.kt-footer__note {
  margin: 0;
  max-width: 72ch;
  color: var(--kt-muted);
  font-size: 14px;
  line-height: 1.75;
}

.kt-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 40px;
  padding-top: 28px;
}

.kt-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.kt-footer__logo {
  font-family: var(--kt-font-display);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--kt-text);
  text-decoration: none;
  transition: color var(--kt-fast) var(--kt-ease);
}

.kt-footer__logo:hover,
.kt-footer__logo:focus-visible { color: var(--kt-lime); }

.kt-footer__tag {
  font-family: var(--kt-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--kt-muted);
}

.kt-footer__legal,
.kt-footer__copy {
  margin: 0;
  font-family: var(--kt-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--kt-muted);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1280px) {
  .kt-brand__tag { display: none; }
  .kt-nav__link { padding: 8px 9px; font-size: 14px; }
}

@media (max-width: 1080px) {
  .kt-navbtn { display: inline-flex; }

  .kt-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 16px 20px 24px;
    background: var(--kt-surface);
    border-top: 1px solid var(--kt-grid-line);
    border-bottom: 2px solid var(--kt-edge);
    box-shadow: 0 16px 0 -8px rgba(0, 0, 0, 0.5);
    max-height: calc(100vh - 76px);
    overflow-y: auto;
  }

  .kt-nav[data-open] { display: flex; }

  .kt-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    width: 100%;
  }

  .kt-nav__item { display: block; }

  .kt-nav__link {
    display: flex;
    width: 100%;
    justify-content: flex-start;
    padding: 13px 12px;
    font-size: 16px;
    border-bottom: 1px solid var(--kt-grid-line);
  }

  .kt-nav__cta {
    margin: 8px 0 0;
    width: 100%;
    min-height: 46px;
  }

  .kt-col-3, .kt-col-4, .kt-col-5 { grid-column: span 6; }
  .kt-col-7, .kt-col-8, .kt-col-9 { grid-column: span 12; }
}

@media (max-width: 900px) {
  body { font-size: 16px; background-size: 96px 96px; }
  .kt-shell { padding-inline: 20px; }
  .kt-header__grid { padding: 10px 20px; }
  .kt-header::before { left: 20px; }
  .kt-footer::before { left: 20px; }
  .kt-section { padding-block: 44px; }
  .kt-panel { padding: 20px; }
  .kt-footer__index { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .kt-footer__inner { padding: 44px 20px 28px; }
}

@media (max-width: 640px) {
  .kt-col-3, .kt-col-4, .kt-col-5, .kt-col-6 { grid-column: span 12; }
  .kt-brand__name { font-size: 18px; }
  .kt-brand__mark { font-size: 11px; padding: 2px 6px; }
  .kt-footer { margin-top: 52px; }
  .kt-footer__index { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .kt-footer__base { flex-direction: column; align-items: flex-start; gap: 14px; }
  .kt-footer__info-item { grid-template-columns: 44px minmax(0, 1fr); }
  .kt-media--wide .kt-media__frame { aspect-ratio: 16 / 9; }
}

/* ---------- 15. 无障碍 / 动效偏好 ---------- */
@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;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

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

  .kt-btn:hover,
  .kt-nav__cta:hover {
    transform: none;
  }
}