/* ============================================================
   赛酷体育 / ARENA SAIKU — 共享外壳样式
   文件位置：/assets/site.css
   负责：reset、变量、中文排版、头部、页脚、按钮、面包屑、
        正文容器、网格、基础组件、图片容器、动效与响应式
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

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

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

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

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

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

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色彩 */
  --ink-950: #061A13;
  --ink-900: #0D2A20;
  --ink-800: #163B2D;
  --ink-700: #234A3B;
  --paper:   #F3F7EA;
  --mute:    #BBC9BF;
  --lime:    #C8FF3D;
  --sand:    #E9C77E;
  --mint:    #75E0C0;
  --coral:   #FF7A5C;

  /* 语义 */
  --bg: var(--ink-950);
  --fg: var(--paper);
  --fg-dim: var(--mute);
  --line: var(--ink-700);
  --accent: var(--lime);

  /* 字体 */
  --font-display: "Barlow Condensed", "Archivo Narrow", "Noto Sans SC",
                  "Source Han Sans CN", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans CN", system-ui, -apple-system,
               "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, "DIN Alternate",
               "SFMono-Regular", Menlo, Consolas, monospace;

  /* 尺寸 */
  --shell: 1280px;
  --gutter: clamp(16px, 4vw, 40px);
  --r-xs: 4px;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-pill: 999px;

  /* 形态 */
  --hair: 1px solid var(--ink-700);
  --border: 2px solid var(--ink-700);
  --border-bright: 2px solid var(--lime);
  --shadow-hard: 6px 6px 0 rgba(0, 0, 0, .45);
  --shadow-soft: 0 18px 44px rgba(0, 0, 0, .45);

  --ease: cubic-bezier(.22, .8, .3, 1);
  --dur: .28s;
}

/* ---------- 3. 页面基底与纸张纹理 ---------- */
body {
  min-height: 100vh;
  background-color: var(--bg);
  background-image:
    repeating-linear-gradient(
      to bottom,
      rgba(243, 247, 234, .026) 0 1px,
      transparent 1px 4px
    );
  color: var(--fg);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.02vw, 17px);
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 球场网格叠层 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(200, 255, 61, .028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 255, 61, .028) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .85;
}

.sk-header,
.sk-main,
.sk-footer { position: relative; z-index: 1; }

::selection {
  background: var(--lime);
  color: var(--ink-950);
}

/* ---------- 4. 排版基线 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.04;
  letter-spacing: -.012em;
  text-wrap: balance;
}

h1 {
  font-weight: 300;
  font-size: clamp(42px, 7.4vw, 104px);
  line-height: .96;
}

h2 {
  font-weight: 800;
  font-size: clamp(27px, 4vw, 54px);
}

h3 {
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 27px);
  line-height: 1.22;
}

h4 {
  font-weight: 700;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.35;
}

p { max-width: 72ch; }

strong, b { font-weight: 700; }

small { font-size: .82em; }

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: .92em;
  color: var(--mint);
}

/* ---------- 5. 无障碍与焦点 ---------- */
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

.sk-skip {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 999;
  transform: translate(-50%, -180%);
  padding: 10px 20px;
  background: var(--lime);
  color: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  border-radius: var(--r-sm);
  box-shadow: 0 6px 0 rgba(0, 0, 0, .4);
  transition: transform .22s var(--ease);
}

.sk-skip:focus,
.sk-skip:focus-visible {
  transform: translate(-50%, 0);
  outline: 2px solid var(--ink-950);
  outline-offset: 2px;
}

/* ---------- 6. 布局容器与区块 ---------- */
.sk-container {
  width: min(100% - (var(--gutter) * 2), var(--shell));
  margin-inline: auto;
}

.sk-section {
  padding-block: clamp(40px, 7vw, 96px);
}

.sk-main {
  padding-top: clamp(92px, 12vw, 132px);
  padding-bottom: clamp(24px, 5vw, 64px);
}

.sk-rule {
  height: 0;
  border: 0;
  border-top: var(--border);
  margin-block: clamp(20px, 3vw, 36px);
}

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

/* ---------- 7. 展签、标签、数据数字 ---------- */
.sk-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sand);
  line-height: 1;
}

.sk-eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--sand);
  flex: 0 0 auto;
}

.sk-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 9px;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-xs);
  background: rgba(22, 59, 45, .62);
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  line-height: 1.2;
  white-space: nowrap;
}

.sk-tag--sand { color: var(--sand); border-color: rgba(233, 199, 126, .5); }
.sk-tag--lime { color: var(--lime); border-color: rgba(200, 255, 61, .5); }
.sk-tag--mint { color: var(--mint); border-color: rgba(117, 224, 192, .5); }

.sk-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: -.03em;
  line-height: .92;
  color: var(--paper);
}

/* ---------- 8. 按钮 ---------- */
.sk-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: .62em 1.3em;
  border: 2px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.sk-cta--primary {
  background: var(--lime);
  color: var(--ink-950);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, .5);
}

.sk-cta--primary:hover {
  background: #d9ff6f;
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, .55);
}

.sk-cta--primary:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 rgba(0, 0, 0, .5);
}

.sk-cta--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--ink-700);
}

.sk-cta--ghost:hover {
  border-color: var(--sand);
  color: var(--sand);
  transform: translateY(-1px);
}

.sk-cta--sand {
  background: var(--sand);
  color: #24190A;
  box-shadow: 3px 3px 0 rgba(0, 0, 0, .5);
}

.sk-cta--sand:hover {
  background: #f2d693;
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, .55);
}

.sk-cta--sm { padding: .5em 1.05em; font-size: 13px; }
.sk-cta--lg { padding: .88em 1.65em; font-size: 17px; }

/* ---------- 9. 面包屑 ---------- */
.sk-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mute);
}

.sk-breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.sk-breadcrumb__item + .sk-breadcrumb__item::before {
  content: "/";
  color: var(--ink-700);
}

.sk-breadcrumb a {
  color: var(--mute);
  transition: color var(--dur) var(--ease);
}

.sk-breadcrumb a:hover { color: var(--lime); }

.sk-breadcrumb [aria-current="page"] { color: var(--sand); }

/* ---------- 10. 图片容器基础规则 ---------- */
.sk-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: var(--border);
  border-radius: var(--r-md);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(135deg, rgba(200, 255, 61, .1), transparent 46%),
    repeating-linear-gradient(
      -45deg,
      rgba(243, 247, 234, .05) 0 2px,
      transparent 2px 10px
    ),
    radial-gradient(circle at 78% 22%, rgba(117, 224, 192, .16), transparent 55%);
  box-shadow: var(--shadow-hard);
}

.sk-media > img,
.sk-media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.sk-media--wide { aspect-ratio: 21 / 9; }
.sk-media--tall { aspect-ratio: 3 / 4; }
.sk-media--square { aspect-ratio: 1 / 1; }

.sk-media__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mute);
}

/* ============================================================
   11. 头部
   ============================================================ */
.sk-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  padding: clamp(10px, 1.4vw, 18px) var(--gutter) 0;
  transition: padding var(--dur) var(--ease);
}

/* 阅读进度 */
.sk-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(35, 74, 59, .55);
  overflow: hidden;
}

.sk-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--mint), var(--lime) 58%, var(--sand));
  box-shadow: 0 0 12px rgba(200, 255, 61, .65);
  transition: width .12s linear;
}

/* 悬浮胶囊 */
.sk-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 9px 12px 9px 16px;
  background-color: #143628;
  background-color: color-mix(in srgb, var(--ink-800) 92%, transparent);
  border: var(--border);
  border-radius: var(--r-pill);
  box-shadow: 0 12px 32px rgba(0, 0, 0, .45),
              inset 0 1px 0 rgba(243, 247, 234, .07);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: padding var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-radius var(--dur) var(--ease);
}

.sk-header[data-scrolled="true"] .sk-header__inner {
  padding-block: 5px;
  background-color: #0F2E22;
  background-color: color-mix(in srgb, var(--ink-900) 96%, transparent);
  box-shadow: 0 16px 40px rgba(0, 0, 0, .58);
}

/* 品牌 */
.sk-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--paper);
  transition: opacity var(--dur) var(--ease);
}

.sk-brand:hover { opacity: .9; }

.sk-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 10px;
  background: var(--lime);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, .45);
  transition: transform var(--dur) var(--ease);
}

.sk-brand:hover .sk-brand__mark { transform: rotate(-6deg); }

.sk-brand__mark::before {
  content: "";
  width: 16px;
  height: 16px;
  border: 2px solid var(--ink-950);
  border-radius: 50%;
}

.sk-brand__mark::after {
  content: "";
  position: absolute;
  top: 7px;
  bottom: 7px;
  left: 50%;
  width: 2px;
  background: var(--ink-950);
  transform: translateX(-50%);
}

.sk-brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.1;
}

.sk-brand__line {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .05em;
  color: var(--paper);
}

.sk-brand__note {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mute);
}

.sk-brand--footer .sk-brand__mark { width: 42px; height: 42px; border-radius: 12px; }
.sk-brand--footer .sk-brand__mark::before { width: 20px; height: 20px; }
.sk-brand--footer .sk-brand__line { font-size: 21px; }
.sk-brand--footer .sk-brand__note { font-size: 10px; }

/* 导航 */
.sk-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

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

.sk-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--mute);
  white-space: nowrap;
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.sk-nav__link:hover {
  color: var(--paper);
  background: rgba(35, 74, 59, .7);
}

.sk-nav__link[aria-current="page"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink-950);
  font-weight: 700;
  box-shadow: 0 0 0 3px rgba(200, 255, 61, .14);
}

.sk-nav__utils {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 6px;
  padding-left: 10px;
  border-left: var(--hair);
}

.sk-nav__util {
  padding: 6px 8px;
  border-radius: var(--r-xs);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mute);
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.sk-nav__util:hover { color: var(--sand); }

/* 右侧动作 */
.sk-header__side {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 移动菜单按钮 */
.sk-navtoggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: var(--border);
  border-radius: var(--r-pill);
  background: rgba(35, 74, 59, .8);
  color: var(--paper);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.sk-navtoggle:hover { border-color: var(--lime); }

.sk-navtoggle__box {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.sk-navtoggle__bar {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .3s var(--ease), opacity .2s var(--ease);
}

.sk-navtoggle__bar:nth-child(1) { top: 0; }
.sk-navtoggle__bar:nth-child(2) { top: 5px; }
.sk-navtoggle__bar:nth-child(3) { top: 10px; }

.sk-navtoggle[aria-expanded="true"] .sk-navtoggle__bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.sk-navtoggle[aria-expanded="true"] .sk-navtoggle__bar:nth-child(2) {
  opacity: 0;
}
.sk-navtoggle[aria-expanded="true"] .sk-navtoggle__bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.sk-navtoggle__text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

/* ============================================================
   12. 页脚
   ============================================================ */
.sk-footer {
  margin-top: clamp(48px, 8vw, 110px);
  padding: clamp(40px, 6vw, 78px) var(--gutter) 0;
  background:
    radial-gradient(circle at 12% 0%, rgba(22, 59, 45, .9), transparent 58%),
    linear-gradient(180deg, var(--ink-950) 0%, #04120D 100%);
  border-top: var(--border);
  color: var(--fg-dim);
}

.sk-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--lime) 16%, var(--sand) 64%, transparent);
  opacity: .8;
}

.sk-footer__top {
  display: grid;
  grid-template-columns: minmax(240px, 1.15fr) repeat(3, minmax(118px, .62fr)) minmax(210px, 1fr);
  gap: clamp(20px, 3vw, 44px);
  width: min(100%, var(--shell));
  margin-inline: auto;
  padding-bottom: clamp(30px, 4.5vw, 58px);
  border-bottom: var(--hair);
}

.sk-footer__brand { min-width: 0; }

.sk-footer__summary {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

.sk-footer__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

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

.sk-footer__heading {
  display: block;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: var(--hair);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--sand);
  line-height: 1.4;
}

.sk-footer__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sk-footer__link {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--mute);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.sk-footer__link:hover {
  color: var(--lime);
  transform: translateX(3px);
}

.sk-footer__contact { min-width: 0; }

.sk-contact__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sk-contact__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.sk-contact__key {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mute);
  opacity: .72;
}

.sk-contact__val {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.sk-footer__note {
  margin-top: 14px;
  max-width: 32ch;
  font-size: 12px;
  line-height: 1.75;
  color: var(--mute);
  opacity: .85;
}

.sk-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  width: min(100%, var(--shell));
  margin-inline: auto;
  padding: 20px 0 30px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--mute);
}

.sk-footer__legal { max-width: none; }

.sk-footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
}

.sk-footer__legal-links a {
  color: var(--mute);
  transition: color var(--dur) var(--ease);
}

.sk-footer__legal-links a:hover { color: var(--lime); }

.sk-footer__stamp {
  margin-left: auto;
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink-700);
  color: rgba(187, 201, 191, .5);
  max-width: none;
}

/* ============================================================
   13. 滚动显现
   ============================================================ */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

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

/* ============================================================
   14. 响应式
   ============================================================ */

/* 平板横向 — 收起工具链接，避免胶囊拥挤 */
@media (max-width: 1180px) {
  .sk-nav__utils { display: none; }
}

/* 平板纵向与手机 — 胶囊切换为下拉档案抽屉 */
@media (max-width: 1023px) {
  .sk-navtoggle { display: inline-flex; }

  .sk-header__side { margin-left: auto; }

  .sk-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: block;
    margin-left: 0;
    padding: 12px;
    background: rgba(10, 34, 25, .98);
    border: var(--border);
    border-radius: var(--r-md);
    box-shadow: 0 26px 60px rgba(0, 0, 0, .62);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s var(--ease),
                transform .22s var(--ease),
                visibility 0s linear .22s;
  }

  .sk-header[data-open="true"] .sk-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity .22s var(--ease),
                transform .22s var(--ease),
                visibility 0s linear 0s;
  }

  .sk-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .sk-nav__link {
    justify-content: flex-start;
    padding: 12px 14px;
    border-radius: 10px;
    font-size: 15px;
  }

  .sk-nav__utils {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin: 10px 0 0;
    padding: 10px 6px 2px;
    border-left: 0;
    border-top: var(--hair);
  }

  .sk-nav__util {
    padding: 6px 10px;
    font-size: 12px;
  }

  .sk-footer__top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sk-footer__brand,
  .sk-footer__contact { grid-column: 1 / -1; }

  .sk-footer__summary,
  .sk-footer__note { max-width: 46ch; }
}

/* 手机 */
@media (max-width: 640px) {
  :root { --shadow-hard: 4px 4px 0 rgba(0, 0, 0, .45); }

  html { scroll-padding-top: 96px; }

  .sk-header { padding-top: 10px; }

  .sk-header__inner {
    gap: 8px;
    padding: 8px 10px 8px 12px;
    border-radius: var(--r-md);
  }

  .sk-brand__line { font-size: 15px; }
  .sk-brand__note { font-size: 8px; letter-spacing: .18em; }
  .sk-brand__mark { width: 30px; height: 30px; border-radius: 9px; }

  .sk-header__side .sk-cta { display: none; }

  .sk-navtoggle__text { display: none; }

  .sk-navtoggle { padding: 9px 11px; }

  .sk-main { padding-top: 96px; }

  .sk-footer__top { grid-template-columns: minmax(0, 1fr); }

  .sk-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .sk-footer__stamp { margin-left: 0; }

  .sk-cta--lg { width: 100%; }
}

/* ============================================================
   15. 动态偏好
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

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

@media (prefers-contrast: more) {
  .sk-nav__link { color: var(--paper); }
  .sk-footer__link { color: var(--paper); }
  .sk-footer__summary,
  .sk-footer__note { color: var(--paper); }
}