/* ============================================
   K1体育 全站共享样式 /assets/site.css
   创意方向：暗黑编辑部 x 竞技红速度力场
   ============================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  --c-red: #e63946;
  --c-red-dark: #c2252f;
  --c-blue: #3a86ff;
  --c-blue-dark: #2268d6;
  --c-black: #0c0c0c;
  --c-dark: #1a1a1a;
  --c-gray: #262626;
  --c-light: #f2f2f2;
  --c-mid: #b3b3b3;
  --c-silver: #c0c0c0;

  --font-head: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'SimSun', serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;

  --header-h: 68px;
  --container-w: 1280px;
  --container-pad: clamp(16px, 3.6vw, 44px);

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 104px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 0.22s ease;
  --transition-base: 0.38s var(--ease-out);
}

/* ---------- 2. 重置与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-light);
  background-color: var(--c-black);
  background-image:
    repeating-linear-gradient(
      60deg,
      transparent 0,
      transparent 28px,
      rgba(255, 255, 255, 0.013) 28px,
      rgba(255, 255, 255, 0.013) 29px
    ),
    radial-gradient(ellipse 70% 44% at 88% -8%, rgba(230, 57, 70, 0.13), transparent 68%),
    radial-gradient(ellipse 40% 30% at 4% 110%, rgba(58, 134, 255, 0.05), transparent 60%);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--c-light);
  text-decoration: none;
}

a:hover {
  color: var(--c-red);
}

p {
  margin-top: 0;
  margin-bottom: 16px;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.5em;
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
  color: var(--c-light);
  letter-spacing: 0.5px;
}

h1 { font-size: clamp(34px, 6vw, 52px); }
h2 { font-size: clamp(26px, 3.6vw, 34px); }
h3 { font-size: clamp(20px, 2.4vw, 26px); }

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

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

::selection {
  background: var(--c-red);
  color: var(--c-light);
}

::-webkit-scrollbar {
  width: 10px;
  background: var(--c-black);
}

::-webkit-scrollbar-thumb {
  background: var(--c-gray);
  border: 2px solid var(--c-black);
  border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--c-red);
}

/* ---------- 3. 布局与通用容器 ---------- */
.container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.main-content {
  padding-top: var(--header-h);
  min-height: 55vh;
  position: relative;
}

#main-content {
  scroll-margin-top: var(--header-h);
}

.section {
  padding-block: var(--space-2xl);
}

.section--tight {
  padding-block: var(--space-xl);
}

.section--dark {
  background: var(--c-dark);
}

.editorial-grid {
  display: grid;
  grid-template-columns: 7fr 3fr 2fr;
  gap: clamp(20px, 3vw, 44px);
  align-items: start;
}

.editorial-grid__main { grid-column: 1; }
.editorial-grid__aside { grid-column: 2; }
.editorial-grid__note { grid-column: 3; }

@media (max-width: 900px) {
  .editorial-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .editorial-grid__main,
  .editorial-grid__aside,
  .editorial-grid__note {
    grid-column: 1;
  }
}

.grid {
  display: grid;
  gap: var(--space-md);
}

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

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .section { padding-block: var(--space-xl); }
  .panel { padding: 22px; }
  h1 { font-size: 32px; }
}

/* ---------- 4. 无障碍跳转 ---------- */
.skip-link {
  position: fixed;
  top: -64px;
  left: 16px;
  z-index: 2000;
  padding: 10px 20px;
  background: var(--c-red);
  color: var(--c-light);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: top var(--transition-fast);
}

.skip-link:focus-visible {
  top: 16px;
  outline: none;
}

/* ---------- 5. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header[data-scrolled] {
  background: rgba(12, 12, 12, 0.92);
  border-bottom-color: rgba(192, 192, 192, 0.18);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  z-index: 1002;
}

.site-header__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-head);
  font-size: 27px;
  font-weight: 900;
  color: var(--c-light);
  letter-spacing: 1px;
  line-height: 1;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-header__brand:hover {
  color: var(--c-light);
}

.site-header__brand-k {
  display: inline-block;
  font-style: italic;
  font-weight: 900;
  font-size: 29px;
  color: var(--c-red);
  transform: skewX(-8deg);
}

.site-header__brand-text {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--c-light);
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-header__nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-light);
  opacity: 0.82;
  letter-spacing: 0.5px;
  white-space: nowrap;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.site-header__nav-link::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  background: var(--c-red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.site-header__nav-link:hover {
  color: var(--c-light);
  opacity: 1;
}

.site-header__nav-link:hover::after {
  transform: scaleX(1);
}

.site-header__nav-link[aria-current="page"] {
  color: var(--c-red);
  opacity: 1;
  font-weight: 700;
}

.site-header__nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-header__cta {
  margin-left: 18px;
}

.site-header__progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-red), rgba(230, 57, 70, 0.45));
  z-index: 1003;
  pointer-events: none;
}

.site-nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(192, 192, 192, 0.28);
  background: rgba(12, 12, 12, 0.6);
  padding: 0;
  flex: none;
}

.site-nav-toggle__bar {
  position: absolute;
  left: 13px;
  right: 13px;
  height: 2px;
  background: var(--c-light);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-nav-toggle__bar:nth-child(1) { top: 15px; }
.site-nav-toggle__bar:nth-child(2) { top: 21px; }
.site-nav-toggle__bar:nth-child(3) { top: 27px; }

.site-nav-toggle.is-active .site-nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-nav-toggle.is-active .site-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.site-nav-toggle.is-active .site-nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 960px) {
  .site-nav-toggle {
    display: block;
  }

  .site-header__nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    z-index: 1001;
    width: min(360px, 86vw);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    margin: 0;
    padding: var(--space-xl) 28px;
    background: rgba(9, 9, 9, 0.98);
    border-left: 1px solid rgba(192, 192, 192, 0.18);
    box-shadow: -12px 0 40px rgba(0, 0, 0, 0.55);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .site-header__nav[data-open] {
    transform: translateX(0);
  }

  .site-header__nav-link {
    padding: 16px 12px;
    font-size: 16px;
    width: 100%;
    opacity: 0.9;
    border-bottom: 1px solid rgba(192, 192, 192, 0.12);
  }

  .site-header__nav-link::after {
    left: 12px;
    right: auto;
    width: 24px;
    bottom: 8px;
  }

  .site-header__cta {
    margin: 28px 0 0;
    justify-content: center;
    width: 100%;
  }
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  line-height: 1;
  border: 1px solid transparent;
  background: transparent;
  color: var(--c-light);
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn:active {
  transform: scale(0.97);
}

.btn--red {
  background: var(--c-red);
  border-color: var(--c-red);
  color: #fff;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.btn--red:hover {
  background: var(--c-red-dark);
  border-color: var(--c-red-dark);
  color: #fff;
}

.btn--outline {
  border-color: var(--c-silver);
  background: transparent;
  color: var(--c-light);
}

.btn--outline:hover {
  border-color: var(--c-blue);
  color: var(--c-blue);
  background: rgba(58, 134, 255, 0.07);
}

.btn--ghost {
  color: var(--c-mid);
}

.btn--ghost:hover {
  color: var(--c-light);
  background: var(--c-gray);
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: auto;
  padding-top: var(--space-2xl);
  background:
    linear-gradient(180deg, transparent, rgba(230, 57, 70, 0.04)),
    var(--c-dark);
  border-top: 1px solid rgba(192, 192, 192, 0.22);
}

.site-footer::before {
  content: '';
  display: block;
  height: 3px;
  position: absolute;
  top: -3px;
  left: 0;
  right: 0;
  background: linear-gradient(90deg, var(--c-red) 0%, var(--c-red) 160px, transparent 360px);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.7fr;
  gap: clamp(32px, 5vw, 80px);
  padding-bottom: var(--space-xl);
}

.site-footer__logo {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 32px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 2px;
  color: var(--c-light);
}

.site-footer__logo span {
  display: inline-block;
  color: var(--c-red);
  font-style: italic;
  font-weight: 900;
  transform: skewX(-6deg);
}

.site-footer__about {
  margin-top: 18px;
  max-width: 36ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mid);
}

.site-footer__trust {
  display: inline-block;
  margin-top: 24px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--c-red);
  border: 1px solid rgba(230, 57, 70, 0.4);
  background: rgba(230, 57, 70, 0.04);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-footer__contact {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-footer__heading {
  margin: 0 0 22px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--c-light);
  padding-bottom: 10px;
  position: relative;
}

.site-footer__heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--c-red);
}

.site-footer__link {
  display: block;
  padding: 7px 0;
  font-size: 14px;
  color: var(--c-mid);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.site-footer__link:hover {
  color: var(--c-blue);
  padding-left: 8px;
}

.site-footer__contact-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mid);
}

.site-footer__contact-label {
  flex: none;
  min-width: 3.5em;
  padding-right: 10px;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--c-light);
  border-right: 1px solid rgba(192, 192, 192, 0.3);
  text-align: left;
}

.site-footer__note {
  margin-top: 18px;
  padding-top: 16px;
  font-size: 12px;
  line-height: 1.8;
  color: rgba(179, 179, 179, 0.7);
  border-top: 1px solid rgba(192, 192, 192, 0.18);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 20px 0;
  border-top: 1px solid rgba(192, 192, 192, 0.15);
  font-size: 12px;
  color: rgba(179, 179, 179, 0.6);
}

.site-footer__copyright {
  margin: 0;
}

.site-footer__icp {
  margin: 0;
  letter-spacing: 1px;
}

@media (max-width: 900px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .site-footer {
    padding-top: var(--space-xl);
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .site-footer__brand {
    grid-column: auto;
  }

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

/* ---------- 8. 编辑与印刷组件 ---------- */
.section-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: var(--space-sm);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 5px;
  text-transform: uppercase;
  color: var(--c-red);
}

.section-label::before {
  content: '';
  flex: none;
  width: 38px;
  height: 2px;
  background: var(--c-red);
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 900;
  line-height: 1.18;
  color: var(--c-light);
  letter-spacing: 1px;
}

.section-intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mid);
  max-width: 58ch;
}

.page-title {
  font-family: var(--font-head);
  font-size: clamp(34px, 5.6vw, 50px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 2px;
  color: var(--c-light);
  margin-bottom: 18px;
}

.page-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-mid);
  max-width: 62ch;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--space-lg);
  font-size: 13px;
  color: var(--c-mid);
}

.breadcrumbs a {
  color: var(--c-mid);
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--c-blue);
}

.breadcrumbs__sep {
  color: rgba(179, 179, 179, 0.45);
}

.breadcrumbs__current {
  color: var(--c-light);
  font-weight: 600;
}

.panel {
  position: relative;
  padding: 30px;
  background: linear-gradient(180deg, var(--c-dark) 0%, #151515 100%);
  border: 1px solid rgba(192, 192, 192, 0.16);
  border-top: 3px solid var(--c-silver);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.4);
}

.panel--accent {
  border-left: 3px solid var(--c-red);
  border-top-color: var(--c-red);
}

.panel--print {
  box-shadow: inset 0 0 0 1px rgba(192, 192, 192, 0.08), 0 8px 24px rgba(0, 0, 0, 0.35);
}

.data-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--c-silver);
  border: 1px solid rgba(192, 192, 192, 0.4);
  background: rgba(255, 255, 255, 0.02);
  text-transform: uppercase;
}

.data-tag--red {
  color: var(--c-red);
  border-color: rgba(230, 57, 70, 0.55);
  background: rgba(230, 57, 70, 0.06);
}

.data-tag--blue {
  color: var(--c-blue);
  border-color: rgba(58, 134, 255, 0.5);
  background: rgba(58, 134, 255, 0.06);
}

.speed-line {
  display: block;
  height: 3px;
  width: 100%;
  border: none;
  background: linear-gradient(90deg, var(--c-red) 0%, var(--c-red) 60%, transparent 100%);
}

.link {
  color: var(--c-blue);
  position: relative;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--transition-fast);
}

.link:hover {
  color: var(--c-blue);
}

.link:hover::after {
  transform: scaleX(1);
}

.stat {
  padding: 8px 0;
}

.stat__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-head);
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 900;
  line-height: 1.05;
  color: var(--c-light);
  letter-spacing: 1px;
}

.stat__value--red {
  color: var(--c-red);
}

.stat__value--blue {
  color: var(--c-blue);
}

.stat__unit {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-mid);
  letter-spacing: 1px;
}

.stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--c-mid);
  text-transform: uppercase;
}

.media-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(230, 57, 70, 0.08) 0%, transparent 46%),
    linear-gradient(315deg, rgba(58, 134, 255, 0.06) 0%, transparent 50%),
    var(--c-gray);
  color: var(--c-mid);
  font-size: 13px;
  letter-spacing: 2px;
}

.media-frame--wide {
  aspect-ratio: 16 / 9;
}

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

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.media-frame:hover img {
  transform: scale(1.03);
}

.media-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

/* ---------- 9. 滚动显现与焦点 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.65s var(--ease-out),
    transform 0.65s var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

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

:focus-visible {
  outline: 3px solid var(--c-blue);
  outline-offset: 2px;
}

.btn--red:focus-visible {
  background: var(--c-blue);
  border-color: var(--c-blue);
  outline: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

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