/* ==========================================================================
   开体育CN · 全站共享样式 /assets/site.css
   ========================================================================== */

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

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

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

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

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

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

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; }

hr { border: 0; }

#main-content { scroll-margin-top: 104px; }

/* 2. 变量
   ========================================================================== */
:root {
  /* 色彩 */
  --kt-night: #0A1A2F;
  --kt-layer: #12294A;
  --kt-cream: #F4EFE6;
  --kt-rock: #3D4A57;
  --kt-moss: #5B7A57;
  --kt-clay: #A85A3C;
  --kt-copper: #C39A4E;
  --kt-flare: #FF5C1A;
  --kt-blue: #2F7BE0;
  --kt-red: #D0402F;
  --kt-green: #2FA06A;
  --kt-yellow: #EFC03C;
  --kt-ink: #14202E;
  --kt-white: #FFFFFF;

  /* 结构 */
  --kt-edge: rgba(195, 154, 78, 0.32);
  --kt-edge-soft: rgba(195, 154, 78, 0.16);
  --kt-w: 1180px;
  --kt-gutter: 20px;
  --kt-r: 2px;

  /* 字体 */
  --kt-font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --kt-font-display: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --kt-font-num: ui-monospace, SFMono-Regular, "JetBrains Mono", "Roboto Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

/* 3. 基础排版
   ========================================================================== */
body {
  font-family: var(--kt-font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--kt-cream);
  background-color: var(--kt-night);
  background-image:
    linear-gradient(rgba(195, 154, 78, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(195, 154, 78, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: -1px -1px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

::selection {
  background: var(--kt-flare);
  color: #0A1A2F;
}

:focus-visible {
  outline: 2px solid var(--kt-flare);
  outline-offset: 2px;
}

.kt-paper {
  background-color: var(--kt-cream);
  background-image: none;
  color: var(--kt-ink);
}
.kt-paper .kt-h1,
.kt-paper .kt-h2,
.kt-paper .kt-h3,
.kt-paper .kt-h4 { color: var(--kt-ink); }
.kt-paper .kt-lead { color: rgba(20, 32, 46, 0.74); }

/* 4. 通用排版组件
   ========================================================================== */
.kt-container {
  width: 100%;
  max-width: var(--kt-w);
  margin-inline: auto;
  padding-inline: var(--kt-gutter);
}

.kt-section { padding-block: 48px; }
.kt-section--tight { padding-block: 28px; }

.kt-h1, .kt-h2, .kt-h3, .kt-h4 {
  font-family: var(--kt-font-display);
  font-weight: 900;
  font-stretch: condensed;
  letter-spacing: -0.02em;
  line-height: 1.14;
  color: var(--kt-white);
}

.kt-h1 { font-size: clamp(28px, 6vw, 64px); }
.kt-h2 { font-size: clamp(22px, 3.4vw, 34px); }
.kt-h3 { font-size: clamp(18px, 2.1vw, 22px); }
.kt-h4 { font-size: clamp(16px, 1.5vw, 19px); letter-spacing: 0; }

.kt-lead {
  font-size: 17px;
  line-height: 1.75;
  color: rgba(244, 239, 230, 0.72);
  max-width: 62ch;
}

.kt-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--kt-font-num);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--kt-copper);
  line-height: 1.4;
}
.kt-eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
  opacity: 0.85;
}

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

.kt-rule {
  height: 1px;
  width: 100%;
  background: var(--kt-edge-soft);
}

/* 5. 按钮
   ========================================================================== */
.kt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  border-radius: var(--kt-r);
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}

.kt-btn--primary {
  background: var(--kt-flare);
  color: #0A1A2F;
  border-color: var(--kt-flare);
}
.kt-btn--primary:hover { background: #FF7A3D; border-color: #FF7A3D; }
.kt-btn--primary:focus-visible { outline-color: var(--kt-white); }

.kt-btn--ghost {
  background: transparent;
  color: var(--kt-cream);
  border-color: rgba(195, 154, 78, 0.5);
}
.kt-btn--ghost:hover {
  border-color: var(--kt-copper);
  background: rgba(195, 154, 78, 0.12);
}

/* 6. 标签 / 卡片 / 网格
   ========================================================================== */
.kt-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  font-family: var(--kt-font-num);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  white-space: nowrap;
  border: 1px solid currentColor;
  border-radius: 1px;
  color: rgba(244, 239, 230, 0.82);
}

.kt-tag--blue   { color: #8FBBF5; border-color: rgba(47, 123, 224, 0.55); background: rgba(47, 123, 224, 0.16); }
.kt-tag--red    { color: #F09B8D; border-color: rgba(208, 64, 47, 0.55);  background: rgba(208, 64, 47, 0.16); }
.kt-tag--green  { color: #86D9AF; border-color: rgba(47, 160, 106, 0.55); background: rgba(47, 160, 106, 0.16); }
.kt-tag--yellow { color: #F5D97D; border-color: rgba(239, 192, 60, 0.55); background: rgba(239, 192, 60, 0.16); }
.kt-tag--copper { color: #DFBE7E; border-color: rgba(195, 154, 78, 0.5); }
.kt-tag--moss   { color: #A3C29D; border-color: rgba(91, 122, 87, 0.6);  background: rgba(91, 122, 87, 0.18); }
.kt-tag--clay   { color: #E0A48B; border-color: rgba(168, 90, 60, 0.6);  background: rgba(168, 90, 60, 0.18); }

.kt-card {
  position: relative;
  padding: 20px;
  background: var(--kt-layer);
  border: 1px solid var(--kt-edge-soft);
  border-radius: var(--kt-r);
}
.kt-card--flat { background: transparent; }
.kt-card--accent::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  bottom: -1px;
  width: 3px;
  background: var(--kt-flare);
}

.kt-grid { display: grid; gap: 20px; }
.kt-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.kt-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.kt-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 7. 面包屑
   ========================================================================== */
.kt-breadcrumb {
  padding-block: 18px;
  font-family: var(--kt-font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(244, 239, 230, 0.55);
}
.kt-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.kt-breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.kt-breadcrumb li + li::before {
  content: "/";
  color: var(--kt-copper);
  opacity: 0.7;
}
.kt-breadcrumb a {
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.kt-breadcrumb a:hover {
  color: var(--kt-cream);
  border-bottom-color: var(--kt-copper);
}
.kt-breadcrumb [aria-current="page"] { color: var(--kt-copper); }

/* 8. 图片容器（供页面阶段放置图片）
   ========================================================================== */
.kt-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: linear-gradient(150deg, #12294A, #0D2038);
  border: 1px solid var(--kt-edge-soft);
  border-radius: var(--kt-r);
}

.kt-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-image:
    linear-gradient(135deg, rgba(195, 154, 78, 0.14), rgba(47, 123, 224, 0.10)),
    repeating-linear-gradient(45deg, rgba(244, 239, 230, 0.05) 0 1px, transparent 1px 14px);
}

.kt-figure--wide .kt-figure__img { aspect-ratio: 21 / 9; }
.kt-figure--tall .kt-figure__img { aspect-ratio: 3 / 4; }
.kt-figure--square .kt-figure__img { aspect-ratio: 1 / 1; }

.kt-figure__cap {
  padding: 10px 12px;
  font-family: var(--kt-font-num);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: rgba(244, 239, 230, 0.62);
  border-top: 1px solid var(--kt-edge-soft);
}

/* 9. 筛选输入 / Tabs
   ========================================================================== */
.kt-field {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: rgba(18, 41, 74, 0.62);
  border: 1px solid var(--kt-edge);
  border-radius: var(--kt-r);
}
.kt-field__label {
  font-family: var(--kt-font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--kt-copper);
  white-space: nowrap;
}
.kt-field input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0;
  background: transparent;
  border: 0;
  outline: none;
  font-size: 14px;
  color: var(--kt-cream);
}
.kt-field input::placeholder { color: rgba(244, 239, 230, 0.42); }

.kt-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(195, 154, 78, 0.24);
}
.kt-tabs__tab {
  padding: 10px 14px;
  font-family: var(--kt-font-num);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: rgba(244, 239, 230, 0.64);
  border-bottom: 2px solid transparent;
  border-radius: 2px 2px 0 0;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.kt-tabs__tab:hover {
  color: var(--kt-white);
  background: rgba(244, 239, 230, 0.06);
}
.kt-tabs__tab[aria-selected="true"] {
  color: var(--kt-white);
  border-bottom-color: var(--kt-flare);
}
.kt-tabs__panel[hidden] { display: none; }

/* 10. Skip link
   ========================================================================== */
.kt-skip {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 700;
  color: #0A1A2F;
  background: var(--kt-flare);
  border-radius: var(--kt-r);
  transition: top 0.16s ease;
}
.kt-skip:focus,
.kt-skip:focus-visible {
  top: 12px;
  outline: 2px solid var(--kt-white);
  outline-offset: 2px;
}

/* 11. 页头
   ========================================================================== */
.kt-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(10, 26, 47, 0.94) 0%, rgba(10, 26, 47, 0.7) 62%, rgba(10, 26, 47, 0) 100%);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}
.kt-header[data-scrolled="true"] {
  background: rgba(10, 26, 47, 0.96);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(195, 154, 78, 0.24);
}

.kt-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--kt-w);
  margin-inline: auto;
  padding: 12px var(--kt-gutter);
}

/* 品牌 */
.kt-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.kt-brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  font-family: var(--kt-font-display);
  font-size: 19px;
  font-weight: 900;
  line-height: 1;
  color: var(--kt-copper);
  background: linear-gradient(140deg, rgba(195, 154, 78, 0.22), rgba(195, 154, 78, 0) 66%);
  border: 1px solid rgba(195, 154, 78, 0.55);
  border-radius: var(--kt-r);
  transition: color 0.16s ease, border-color 0.16s ease;
}
.kt-brand:hover .kt-brand__mark {
  color: var(--kt-flare);
  border-color: var(--kt-flare);
}

.kt-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.15;
}
.kt-brand__name {
  font-family: var(--kt-font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--kt-white);
}
.kt-brand__tag {
  font-family: var(--kt-font-num);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--kt-copper);
}

/* 悬浮胶囊导航 */
.kt-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
  padding: 4px;
  background: rgba(18, 41, 74, 0.72);
  border: 1px solid var(--kt-edge);
  border-radius: 999px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}
.kt-header[data-scrolled="true"] .kt-nav {
  background: rgba(18, 41, 74, 0.94);
  border-color: rgba(195, 154, 78, 0.5);
}

.kt-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.kt-nav__link {
  position: relative;
  display: block;
  padding: 8px 12px;
  font-size: 13.5px;
  line-height: 1.4;
  letter-spacing: 0.01em;
  white-space: nowrap;
  color: rgba(244, 239, 230, 0.78);
  border-radius: 999px;
  transition: color 0.15s ease, background-color 0.15s ease;
}
.kt-nav__link:hover {
  color: var(--kt-white);
  background: rgba(244, 239, 230, 0.08);
}
.kt-nav__link[aria-current="page"] {
  color: var(--kt-white);
  font-weight: 600;
}
.kt-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--kt-flare);
  border-radius: 1px;
}

.kt-header[data-scrolled="true"] .kt-brand__tag { display: none; }
.kt-header[data-scrolled="true"] .kt-nav__link {
  padding-block: 6px;
  font-size: 13px;
}

/* 桌面端隐藏移动快捷区 */
.kt-nav__quick { display: none; }

.kt-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 移动导航按钮 */
.kt-navtoggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  padding: 0;
  flex: 0 0 auto;
  background: rgba(18, 41, 74, 0.72);
  border: 1px solid rgba(195, 154, 78, 0.5);
  border-radius: var(--kt-r);
  cursor: pointer;
  transition: border-color 0.16s ease, background-color 0.16s ease;
}
.kt-navtoggle:hover { border-color: var(--kt-copper); }

.kt-navtoggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--kt-cream);
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.kt-navtoggle__bar + .kt-navtoggle__bar { margin-top: 4px; }

.kt-header[data-open="true"] .kt-navtoggle { border-color: var(--kt-flare); }
.kt-header[data-open="true"] .kt-navtoggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.kt-header[data-open="true"] .kt-navtoggle__bar:nth-child(2) { opacity: 0; }
.kt-header[data-open="true"] .kt-navtoggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 滚动进度 */
.kt-progress {
  height: 2px;
  background: rgba(195, 154, 78, 0.12);
  overflow: hidden;
}
.kt-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--kt-flare);
  transition: width 0.08s linear;
}

/* 12. 页脚
   ========================================================================== */
.kt-footer {
  position: relative;
  margin-top: 72px;
  background: var(--kt-night);
  border-top: 1px solid rgba(195, 154, 78, 0.22);
  color: rgba(244, 239, 230, 0.75);
  font-size: 14px;
}

.kt-footer__strip {
  display: flex;
  height: 3px;
  overflow: hidden;
}
.kt-footer__strip span { flex: 1 1 20%; }
.kt-footer__strip span:nth-child(1) { background: var(--kt-blue); }
.kt-footer__strip span:nth-child(2) { background: var(--kt-white); }
.kt-footer__strip span:nth-child(3) { background: var(--kt-red); }
.kt-footer__strip span:nth-child(4) { background: var(--kt-green); }
.kt-footer__strip span:nth-child(5) { background: var(--kt-yellow); }

.kt-footer__inner {
  width: 100%;
  max-width: var(--kt-w);
  margin-inline: auto;
  padding: 52px var(--kt-gutter) 0;
}

.kt-footer__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1fr;
  gap: 32px 40px;
}

.kt-footer__brand .kt-brand__mark { margin-bottom: 14px; }

.kt-footer__name {
  font-family: var(--kt-font-display);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--kt-white);
  line-height: 1.2;
}

.kt-footer__tag {
  margin-top: 6px;
  font-family: var(--kt-font-num);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--kt-copper);
}

.kt-footer__pitch {
  margin-top: 14px;
  max-width: 32ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(244, 239, 230, 0.62);
}

.kt-footer__contact-list {
  display: grid;
  gap: 8px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--kt-edge-soft);
}
.kt-footer__contact-list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  font-family: var(--kt-font-num);
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: 0.02em;
  color: rgba(244, 239, 230, 0.72);
  word-break: break-word;
}
.kt-footer__label {
  color: rgba(195, 154, 78, 0.92);
  letter-spacing: 0.1em;
}

.kt-footer__title {
  margin-bottom: 16px;
  font-family: var(--kt-font-num);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--kt-copper);
}

.kt-footer__links {
  display: grid;
  gap: 10px;
}
.kt-footer__links a {
  display: inline-flex;
  align-items: center;
  gap: 0;
  font-size: 14px;
  color: rgba(244, 239, 230, 0.78);
  transition: color 0.15s ease, gap 0.16s ease;
}
.kt-footer__links a::before {
  content: "";
  width: 0;
  height: 1px;
  background: var(--kt-flare);
  transition: width 0.16s ease;
}
.kt-footer__links a:hover { color: var(--kt-white); }
.kt-footer__links a:hover::before { width: 12px; }
.kt-footer__links a:hover { gap: 8px; }

.kt-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: 44px;
  padding: 18px 0 30px;
  border-top: 1px solid rgba(195, 154, 78, 0.18);
  font-family: var(--kt-font-num);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(244, 239, 230, 0.55);
}
.kt-footer__copy,
.kt-footer__disclaimer { margin: 0; }
.kt-footer__disclaimer { color: rgba(244, 239, 230, 0.45); }

/* 13. 响应式
   ========================================================================== */
@media (max-width: 1040px) {
  .kt-nav__link { padding-inline: 9px; font-size: 13px; }
}

@media (max-width: 1000px) {
  .kt-header__actions { margin-left: auto; }

  .kt-nav {
    position: absolute;
    top: calc(100% + 6px);
    left: var(--kt-gutter);
    right: var(--kt-gutter);
    display: none;
    flex-direction: column;
    align-items: stretch;
    max-height: calc(100vh - 120px);
    margin-left: 0;
    padding: 10px;
    overflow-y: auto;
    background: rgba(10, 26, 47, 0.98);
    border-color: rgba(195, 154, 78, 0.44);
    border-radius: var(--kt-r);
    box-shadow: 0 24px 44px -22px rgba(0, 0, 0, 0.9);
  }

  .kt-header[data-open="true"] .kt-nav { display: flex; }

  .kt-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .kt-nav__item + .kt-nav__item { border-top: 1px solid rgba(195, 154, 78, 0.14); }

  .kt-nav__link {
    padding: 12px 10px;
    font-size: 15px;
    border-radius: var(--kt-r);
  }
  .kt-nav__link[aria-current="page"]::after {
    left: 10px;
    right: auto;
    bottom: 8px;
    width: 16px;
  }

  .kt-nav__quick {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(195, 154, 78, 0.2);
  }
  .kt-nav__quick a {
    padding: 5px 10px;
    font-family: var(--kt-font-num);
    font-size: 12px;
    letter-spacing: 0.06em;
    color: var(--kt-yellow);
    border: 1px solid rgba(239, 192, 60, 0.42);
    border-radius: 1px;
    transition: background-color 0.15s ease, color 0.15s ease;
  }
  .kt-nav__quick a:hover,
  .kt-nav__quick a:focus-visible {
    color: #0A1A2F;
    background: var(--kt-yellow);
  }

  .kt-navtoggle { display: block; }

  .kt-grid--3,
  .kt-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .kt-footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .kt-footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  :root { --kt-gutter: 16px; }

  body { font-size: 15px; }

  .kt-section { padding-block: 36px; }

  .kt-header__actions .kt-btn { display: none; }

  .kt-brand__tag { display: none; }

  .kt-grid--2,
  .kt-grid--3,
  .kt-grid--4 { grid-template-columns: minmax(0, 1fr); }

  .kt-footer { margin-top: 52px; }
  .kt-footer__inner { padding-top: 40px; }
  .kt-footer__grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .kt-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    margin-top: 32px;
    padding-bottom: 24px;
  }
}

/* 14. 动效与可访问性
   ========================================================================== */
@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;
  }

  .kt-btn:hover,
  .kt-figure:hover { transform: none !important; }
}