/* ============================================================
   K1体育看台 — 共享样式 /assets/site.css
   夜场黑底 · 辣椒红锚点 · 看台斜切 · 堆叠研究板
   ============================================================ */

:root {
  --k1-black: #0B0B0C;
  --k1-concrete: #17181A;
  --k1-stand: #2B2D31;
  --k1-chalk: #F5F2EA;
  --k1-red: #E63329;
  --k1-green: #1F7A5A;
  --k1-lime: #A8FF3E;
  --k1-amber: #FFB020;
  --k1-mist: #8B949E;

  --k1-font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Microsoft YaHei", system-ui, sans-serif;
  --k1-font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Microsoft YaHei", system-ui, sans-serif;
  --k1-font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace,
    "SFMono-Regular", Menlo, Consolas, monospace;

  --k1-radius: 10px;
  --k1-radius-pill: 999px;
  --k1-border: 2px solid var(--k1-stand);
  --k1-border-strong: 3px solid var(--k1-stand);
  --k1-shadow: 8px 8px 0 rgba(0, 0, 0, 0.55);
  --k1-shadow-lift: 6px 10px 0 rgba(230, 51, 41, 0.28);
  --k1-wrap: 1240px;
  --k1-gutter: clamp(16px, 4vw, 40px);
  --k1-header-h: 74px;
  --k1-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

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

body {
  margin: 0;
  background-color: var(--k1-black);
  background-image:
    radial-gradient(circle at 12% -8%, rgba(230, 51, 41, 0.16), transparent 46%),
    radial-gradient(circle at 88% 4%, rgba(31, 122, 90, 0.16), transparent 42%),
    repeating-linear-gradient(
      115deg,
      rgba(255, 255, 255, 0.022) 0 2px,
      transparent 2px 9px
    );
  color: var(--k1-chalk);
  font-family: var(--k1-font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  min-height: 100vh;
}

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

a {
  color: var(--k1-chalk);
  text-decoration: none;
}

a:hover {
  color: var(--k1-lime);
}

p {
  margin: 0 0 1.1em;
}

h1,
h2,
h3,
h4 {
  font-family: var(--k1-font-display);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 0.96;
  margin: 0 0 0.5em;
  color: var(--k1-chalk);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 5.4rem);
}

h2 {
  font-size: clamp(1.9rem, 3.4vw, 3rem);
}

h3 {
  font-size: clamp(1.15rem, 1.7vw, 1.55rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

ul,
ol {
  margin: 0 0 1.1em;
  padding-left: 1.25em;
}

strong {
  font-weight: 700;
  color: var(--k1-chalk);
}

:focus-visible {
  outline: 3px solid var(--k1-lime);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--k1-red);
  color: var(--k1-chalk);
}

/* ---------- 布局容器 ---------- */

.k1-container {
  width: 100%;
  max-width: var(--k1-wrap);
  margin-inline: auto;
  padding-inline: var(--k1-gutter);
}

.k1-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.k1-prose {
  max-width: 70ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: rgba(245, 242, 234, 0.9);
}

.k1-prose h2 {
  margin-top: 1.6em;
}

.k1-prose h3 {
  margin-top: 1.4em;
}

.k1-prose a {
  color: var(--k1-lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.k1-mono {
  font-family: var(--k1-font-mono);
  font-size: 0.855em;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.k1-index {
  font-family: var(--k1-font-mono);
  font-weight: 700;
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  line-height: 0.8;
  letter-spacing: -0.06em;
  color: transparent;
  -webkit-text-stroke: 2px var(--k1-stand);
  display: block;
}

.k1-rule {
  height: 3px;
  width: 100%;
  border: 0;
  margin: clamp(28px, 5vw, 64px) 0;
  background: linear-gradient(
    100deg,
    var(--k1-red) 0%,
    var(--k1-red) 22%,
    var(--k1-stand) 22%,
    var(--k1-stand) 100%
  );
  transform: skewX(-6deg);
}

/* ---------- 可访问跳过链接 ---------- */

.k1-skip {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--k1-lime);
  color: var(--k1-black);
  font-family: var(--k1-font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--k1-radius-pill);
  transform: translateY(-180%);
  transition: transform 0.18s var(--k1-ease);
}

.k1-skip:focus,
.k1-skip:focus-visible {
  transform: translateY(0);
  color: var(--k1-black);
  outline: 3px solid var(--k1-chalk);
  outline-offset: 2px;
}

/* ---------- 滚动进度条 ---------- */

.k1-topbar {
  position: fixed;
  inset: 0 auto auto 0;
  height: 4px;
  width: 0%;
  z-index: 120;
  background: linear-gradient(90deg, var(--k1-red), var(--k1-lime));
  transition: width 0.12s linear;
  pointer-events: none;
}

/* ---------- 悬浮胶囊头部 ---------- */

.k1-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px var(--k1-gutter) 6px;
  pointer-events: none;
}

.k1-nav-shell {
  pointer-events: auto;
  width: 100%;
  max-width: var(--k1-wrap);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 9px 12px 9px 16px;
  background: rgba(23, 24, 26, 0.94);
  border: var(--k1-border-strong);
  border-radius: var(--k1-radius-pill);
  box-shadow: 0 10px 0 rgba(0, 0, 0, 0.42), inset 0 0 0 1px rgba(245, 242, 234, 0.05);
  backdrop-filter: blur(10px);
  transition: max-width 0.3s var(--k1-ease), padding 0.3s var(--k1-ease),
    background 0.3s var(--k1-ease);
}

.k1-header[data-compact] .k1-nav-shell {
  padding-block: 6px;
  background: rgba(18, 19, 21, 0.97);
  max-width: 1080px;
}

.k1-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  color: var(--k1-chalk);
}

.k1-brand-mark {
  display: inline-grid;
  place-items: center;
  min-width: 46px;
  height: 40px;
  padding-inline: 8px;
  background: var(--k1-red);
  color: var(--k1-chalk);
  font-family: var(--k1-font-display);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.05em;
  border-radius: 8px;
  transform: skewX(-6deg);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.6);
}

.k1-brand-text {
  font-family: var(--k1-font-display);
  font-weight: 900;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.k1-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.k1-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.k1-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 11px;
  border-radius: var(--k1-radius-pill);
  color: rgba(245, 242, 234, 0.82);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.16s var(--k1-ease), color 0.16s var(--k1-ease);
}

.k1-nav-idx {
  font-family: var(--k1-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--k1-mist);
  letter-spacing: 0.04em;
}

.k1-nav-link:hover,
.k1-nav-link:focus-visible {
  background: rgba(245, 242, 234, 0.08);
  color: var(--k1-chalk);
}

.k1-nav-link[aria-current="page"] {
  background: var(--k1-red);
  color: var(--k1-chalk);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.2);
}

.k1-nav-link[aria-current="page"] .k1-nav-idx {
  color: var(--k1-lime);
}

.k1-nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.k1-nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  border-radius: var(--k1-radius-pill);
  background: var(--k1-red);
  color: var(--k1-chalk);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  border: 2px solid transparent;
  transition: transform 0.16s var(--k1-ease), box-shadow 0.16s var(--k1-ease),
    background 0.16s var(--k1-ease);
}

.k1-nav-cta:hover,
.k1-nav-cta:focus-visible {
  color: var(--k1-black);
  background: var(--k1-lime);
  transform: translateY(-2px);
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.5);
}

.k1-nav-cta--ghost {
  background: transparent;
  color: var(--k1-chalk);
  border-color: var(--k1-stand);
}

.k1-nav-cta--ghost:hover,
.k1-nav-cta--ghost:focus-visible {
  background: var(--k1-stand);
  color: var(--k1-lime);
}

.k1-nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 14px;
  background: var(--k1-stand);
  color: var(--k1-chalk);
  border: 2px solid transparent;
  border-radius: var(--k1-radius-pill);
  font-family: var(--k1-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  cursor: pointer;
}

.k1-nav-toggle-bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.k1-nav-toggle-bars i {
  display: block;
  height: 2px;
  background: var(--k1-lime);
  transition: transform 0.2s var(--k1-ease), opacity 0.2s var(--k1-ease);
}

.k1-header[data-open] .k1-nav-toggle-bars i:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.k1-header[data-open] .k1-nav-toggle-bars i:nth-child(2) {
  opacity: 0;
}

.k1-header[data-open] .k1-nav-toggle-bars i:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 通用按钮 ---------- */

.k1-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 22px;
  border: var(--k1-border-strong);
  border-radius: 8px;
  background: var(--k1-concrete);
  color: var(--k1-chalk);
  font-family: var(--k1-font-body);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.16s var(--k1-ease), box-shadow 0.16s var(--k1-ease),
    background 0.16s var(--k1-ease), color 0.16s var(--k1-ease);
}

.k1-btn:hover,
.k1-btn:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.6);
  color: var(--k1-chalk);
}

.k1-btn--primary {
  background: var(--k1-red);
  border-color: var(--k1-red);
  color: var(--k1-chalk);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.55);
}

.k1-btn--primary:hover,
.k1-btn--primary:focus-visible {
  background: var(--k1-lime);
  border-color: var(--k1-lime);
  color: var(--k1-black);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.7);
}

.k1-btn--ghost {
  background: transparent;
  border-color: var(--k1-stand);
  color: var(--k1-chalk);
}

.k1-btn--ghost:hover,
.k1-btn--ghost:focus-visible {
  border-color: var(--k1-lime);
  color: var(--k1-lime);
}

/* ---------- 标签 ---------- */

.k1-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: var(--k1-radius-pill);
  background: var(--k1-stand);
  color: var(--k1-chalk);
  font-family: var(--k1-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.5;
}

.k1-tag--red {
  background: var(--k1-red);
  color: var(--k1-chalk);
}

.k1-tag--green {
  background: var(--k1-green);
  color: var(--k1-chalk);
}

.k1-tag--lime {
  background: var(--k1-lime);
  color: var(--k1-black);
}

.k1-tag--amber {
  background: var(--k1-amber);
  color: var(--k1-black);
}

/* ---------- 堆叠面板 / 研究板 ---------- */

.k1-panel {
  position: relative;
  background: var(--k1-concrete);
  border: var(--k1-border-strong);
  border-radius: var(--k1-radius);
  box-shadow: var(--k1-shadow);
  padding: clamp(20px, 3vw, 36px);
}

.k1-panel--slant {
  clip-path: polygon(0 0, 100% 2.2%, 100% 100%, 0 calc(100% - 2.2%));
}

.k1-panel--chalk {
  background: var(--k1-chalk);
  color: var(--k1-black);
  border-color: var(--k1-black);
}

.k1-panel--chalk h2,
.k1-panel--chalk h3 {
  color: var(--k1-black);
}

.k1-research-sheet {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--k1-concrete);
  border: var(--k1-border-strong);
  border-radius: var(--k1-radius);
  box-shadow: var(--k1-shadow);
  overflow: hidden;
}

.k1-sheet-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: var(--k1-stand);
  border-bottom: 2px solid rgba(0, 0, 0, 0.4);
}

.k1-sheet-head .k1-mono {
  color: var(--k1-lime);
  font-weight: 700;
}

.k1-sheet-body {
  padding: clamp(18px, 2.6vw, 30px);
}

.k1-sheet-foot {
  padding: 12px 18px;
  border-top: 2px solid var(--k1-stand);
  background: rgba(11, 11, 12, 0.5);
  font-size: 0.9rem;
  color: rgba(245, 242, 234, 0.75);
}

/* ---------- 章节标题 ---------- */

.k1-section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.k1-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--k1-font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--k1-red);
}

.k1-eyebrow::before {
  content: "";
  width: 22px;
  height: 3px;
  background: var(--k1-red);
  transform: skewX(-20deg);
}

/* ---------- 面包屑 ---------- */

.k1-breadcrumb {
  padding-block: 14px;
  font-family: var(--k1-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--k1-mist);
}

.k1-breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.k1-breadcrumb-list li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.k1-breadcrumb-list li:not(:last-child)::after {
  content: "/";
  color: var(--k1-stand);
}

.k1-breadcrumb-link {
  color: var(--k1-mist);
  text-decoration: none;
}

.k1-breadcrumb-link:hover,
.k1-breadcrumb-link:focus-visible {
  color: var(--k1-lime);
}

/* ---------- 图片容器基础规则 ---------- */

.k1-media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(230, 51, 41, 0.18), transparent 60%),
    repeating-linear-gradient(
      115deg,
      var(--k1-stand) 0 10px,
      var(--k1-concrete) 10px 20px
    );
  border: var(--k1-border-strong);
  border-radius: 8px;
}

.k1-media > img,
.k1-media > picture,
.k1-media > picture > img,
.k1-media > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.06);
}

.k1-media--portrait {
  aspect-ratio: 3 / 4;
}

.k1-media--wide {
  aspect-ratio: 21 / 9;
}

.k1-media--square {
  aspect-ratio: 1 / 1;
}

.k1-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(11, 11, 12, 0.55));
  pointer-events: none;
}

/* ---------- 数据条 ---------- */

.k1-meter {
  position: relative;
  height: 10px;
  width: 100%;
  background: var(--k1-stand);
  border-radius: var(--k1-radius-pill);
  overflow: hidden;
}

.k1-meter-fill {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--k1-green), var(--k1-lime));
  border-radius: inherit;
  transition: width 0.6s var(--k1-ease);
}

.k1-meter--red .k1-meter-fill {
  background: linear-gradient(90deg, var(--k1-red), var(--k1-amber));
}

/* ---------- 标签页 ---------- */

.k1-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 6px;
  background: var(--k1-concrete);
  border: var(--k1-border);
  border-radius: var(--k1-radius-pill);
}

.k1-tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: rgba(245, 242, 234, 0.78);
  font-family: var(--k1-font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 9px 16px;
  border-radius: var(--k1-radius-pill);
  cursor: pointer;
  transition: background 0.16s var(--k1-ease), color 0.16s var(--k1-ease);
}

.k1-tab[aria-selected="true"] {
  background: var(--k1-red);
  color: var(--k1-chalk);
}

.k1-tab:not([aria-selected="true"]):hover {
  background: var(--k1-stand);
  color: var(--k1-chalk);
}

.k1-tabpanel {
  padding-top: clamp(16px, 2.4vw, 28px);
}

.k1-tabpanel[hidden] {
  display: none;
}

/* ---------- 滚动显现 ---------- */

.k1-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--k1-ease), transform 0.5s var(--k1-ease);
  will-change: opacity, transform;
}

.k1-reveal[data-visible] {
  opacity: 1;
  transform: none;
}

/* ---------- 页脚 ---------- */

.k1-footer {
  margin-top: clamp(64px, 10vw, 120px);
  background: var(--k1-black);
  border-top: 3px solid var(--k1-stand);
  position: relative;
  overflow: hidden;
}

.k1-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 8px;
  background: linear-gradient(
    95deg,
    var(--k1-red) 0%,
    var(--k1-red) 18%,
    var(--k1-green) 18%,
    var(--k1-green) 26%,
    var(--k1-lime) 26%,
    var(--k1-lime) 30%,
    transparent 30%
  );
}

.k1-footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr 1fr 1fr;
  gap: clamp(24px, 4vw, 52px);
  padding-block: clamp(40px, 6vw, 72px) clamp(28px, 4vw, 44px);
}

.k1-footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.k1-footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--k1-chalk);
}

.k1-footer-logo-mark {
  display: inline-grid;
  place-items: center;
  min-width: 50px;
  height: 44px;
  padding-inline: 8px;
  background: var(--k1-red);
  color: var(--k1-chalk);
  font-family: var(--k1-font-display);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.05em;
  border-radius: 8px;
  transform: skewX(-6deg);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.6);
}

.k1-footer-logo-text {
  font-family: var(--k1-font-display);
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0.01em;
}

.k1-footer-tagline {
  margin: 0;
  max-width: 26ch;
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.5;
  color: rgba(245, 242, 234, 0.88);
}

.k1-footer-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.k1-footer-col {
  min-width: 0;
}

.k1-footer-col-title {
  font-family: var(--k1-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--k1-lime);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--k1-stand);
}

.k1-footer-col-title--sub {
  margin-top: 26px;
  color: var(--k1-amber);
}

.k1-footer-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.k1-footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(245, 242, 234, 0.8);
  font-size: 0.95rem;
  padding-block: 2px;
  transition: color 0.16s var(--k1-ease), transform 0.16s var(--k1-ease);
}

.k1-footer-link::before {
  content: "";
  width: 8px;
  height: 2px;
  background: var(--k1-stand);
  transition: width 0.16s var(--k1-ease), background 0.16s var(--k1-ease);
}

.k1-footer-link:hover,
.k1-footer-link:focus-visible {
  color: var(--k1-lime);
  transform: translateX(3px);
}

.k1-footer-link:hover::before,
.k1-footer-link:focus-visible::before {
  width: 14px;
  background: var(--k1-lime);
}

.k1-footer-address {
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.92rem;
  color: rgba(245, 242, 234, 0.72);
}

.k1-footer-note {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(245, 242, 234, 0.68);
  margin: 0 0 12px;
}

.k1-footer-note--mono {
  font-family: var(--k1-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--k1-mist);
}

.k1-footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 18px 28px;
  border-top: 2px solid var(--k1-stand);
}

.k1-footer-icp,
.k1-footer-copy {
  margin: 0;
  font-family: var(--k1-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--k1-mist);
}

/* ---------- 平板 ---------- */

@media (max-width: 1080px) {
  .k1-nav-actions .k1-nav-cta--ghost {
    display: none;
  }

  .k1-nav-link {
    padding: 8px 9px;
    font-size: 0.84rem;
  }

  .k1-nav-idx {
    display: none;
  }

  .k1-footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- 移动端 ---------- */

@media (max-width: 860px) {
  body {
    font-size: 16px;
  }

  .k1-header {
    padding: 10px var(--k1-gutter) 4px;
  }

  .k1-nav-shell {
    flex-wrap: wrap;
    gap: 8px 10px;
    border-radius: 18px;
    padding: 10px 12px;
  }

  .k1-nav-toggle {
    display: inline-flex;
  }

  .k1-nav {
    order: 4;
    flex-basis: 100%;
    display: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.28s var(--k1-ease);
  }

  .k1-header[data-open] .k1-nav {
    display: block;
    max-height: 70vh;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .k1-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 8px 0 4px;
    border-top: 2px solid var(--k1-stand);
  }

  .k1-nav-link {
    justify-content: flex-start;
    padding: 12px 14px;
    border-radius: 10px;
    font-size: 0.98rem;
  }

  .k1-nav-idx {
    display: inline;
    font-size: 0.74rem;
    min-width: 22px;
    color: var(--k1-mist);
  }

  .k1-nav-actions {
    order: 3;
    margin-left: auto;
  }

  .k1-nav-cta {
    padding: 8px 14px;
    font-size: 0.82rem;
  }

  .k1-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .k1-panel {
    box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.55);
  }

  .k1-footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .k1-footer-tagline {
    max-width: 100%;
  }
}

@media (max-width: 520px) {
  .k1-brand-text {
    display: none;
  }

  .k1-nav-actions .k1-nav-cta {
    padding: 8px 11px;
  }

  .k1-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    -webkit-overflow-scrolling: touch;
  }

  .k1-tab {
    white-space: nowrap;
  }

  .k1-footer-meta {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 动效降级 ---------- */

@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;
  }

  .k1-reveal {
    opacity: 1;
    transform: none;
  }

  .k1-topbar {
    transition: none;
  }
}