/* ============================================================
   开博体育 · 全站共享样式 /assets/site.css
   设计基准：暗夜黑 + 炽热红 + 熔岩橙 + 金属银
   ============================================================ */

/* ---------- 1. 变量与重置 ---------- */
:root {
  --bg-dark: #0A0B10;
  --bg-panel: #161A24;
  --text-silver: #A8B0BC;
  --accent-red: #FF3B1F;
  --accent-orange: #FF7A2E;
  --data-gold: #FFB263;
  --text-bright: #F4F6F8;
  --border-dim: #2C3040;
  --glow-orange: #FF7A2E66;
  --font-headline: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'IBM Plex Sans', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-data: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --font-serif: 'Noto Serif SC', Georgia, serif;
  --content-max: 1320px;
  --header-h: 112px;
  --space-section: 72px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 18px);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-dark);
  background-image: radial-gradient(circle, rgba(44, 48, 64, 0.5) 1px, transparent 1.3px);
  background-size: 26px 26px;
  color: var(--text-silver);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

ul,
ol {
  list-style: none;
}

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

/* ---------- 2. 基础排版 ---------- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-headline);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-bright);
  line-height: 1.2;
  text-wrap: balance;
}

h1 {
  font-size: clamp(34px, 5vw, 56px);
}

h2 {
  font-size: clamp(26px, 3vw, 36px);
}

h3 {
  font-size: clamp(20px, 2vw, 26px);
}

h4 {
  font-size: 18px;
}

p {
  margin-bottom: 1em;
}

a {
  color: var(--accent-orange);
  text-decoration: none;
}

a:hover {
  color: var(--text-bright);
}

code,
kbd {
  font-family: var(--font-data);
  font-size: 0.92em;
  background: var(--bg-panel);
  border: 1px solid var(--border-dim);
  padding: 2px 6px;
  border-radius: 2px;
}

blockquote {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--text-bright);
  border-left: 3px solid var(--accent-orange);
  padding-left: 20px;
  margin: 24px 0;
}

::selection {
  background: var(--accent-red);
  color: var(--text-bright);
}

/* ---------- 3. 焦点与滚动条 ---------- */
:focus-visible {
  outline: 2px solid var(--accent-orange);
  outline-offset: 3px;
  border-radius: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--border-dim);
  border: 2px solid var(--bg-dark);
  border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-orange);
}

/* ---------- 4. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container--narrow {
  max-width: 880px;
}

.main-content {
  flex: 1 0 auto;
  width: 100%;
}

.page-content {
  font-size: 15.5px;
}

.page-content h2 {
  margin: 48px 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-dim);
}

.page-content h3 {
  margin: 32px 0 12px;
}

.page-content ul,
.page-content ol {
  margin: 0 0 1em;
  padding-left: 1.5em;
}

.page-content ul {
  list-style: square;
}

.page-content li::marker {
  color: var(--accent-orange);
}

.layout-split {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}

.layout-split--flip {
  grid-template-columns: 6fr 5fr;
}

/* ---------- 5. 顶部刊头 ---------- */
.skip-link {
  position: fixed;
  top: -64px;
  left: 16px;
  z-index: 2000;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-orange);
  color: var(--bg-dark);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  padding: 12px 18px;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 11, 16, 0.72);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dim);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(10, 11, 16, 0.96);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}

.site-header__progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  overflow: hidden;
  pointer-events: none;
  z-index: 2;
}

.site-header__progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-orange), var(--data-gold));
  transition: width 80ms linear;
}

.site-header__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 16px 24px 0;
}

.site-header__top {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: inherit;
}

.site-brand:hover {
  color: inherit;
}

.site-brand__mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent-red), var(--accent-orange));
  clip-path: polygon(0 0, 100% 0, 100% 72%, 68% 100%, 0 100%);
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 800;
  font-style: italic;
  color: var(--text-bright);
  line-height: 1;
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-brand__name {
  font-family: var(--font-headline);
  font-size: 21px;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--text-bright);
  line-height: 1.15;
}

.site-brand__tagline {
  font-family: var(--font-data);
  font-size: 10px;
  font-style: normal;
  letter-spacing: 0.14em;
  color: var(--accent-orange);
  line-height: 1.3;
}

.site-brand__tagline::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 7px;
  background: var(--accent-red);
  transform: rotate(45deg);
  animation: live-pulse 2.4s infinite ease-in-out;
}

@keyframes live-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.25;
  }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid var(--border-dim);
  border-radius: 2px;
  color: var(--text-silver);
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--accent-orange);
  color: var(--text-bright);
}

.nav-toggle__icon {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle__icon span {
  display: block;
  height: 2px;
  background: currentColor;
  transform-origin: center;
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(2) {
  transform: scaleX(0);
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-header__nav-wrap {
  display: flex;
  justify-content: center;
  padding: 12px 0 0;
}

.site-nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px;
}

.site-nav__item {
  margin: 0;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 17px;
  font-family: var(--font-body);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-silver);
  text-decoration: none;
  line-height: 1.2;
  transition: color 0.2s var(--ease);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 17px;
  right: 17px;
  bottom: 5px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.25s var(--ease);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--text-bright);
}

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

.site-nav__link[aria-current="page"]::before {
  content: '';
  width: 5px;
  height: 5px;
  flex-shrink: 0;
  background: var(--accent-orange);
  transform: rotate(45deg);
}

/* ---------- 6. 数据抽屉页脚 ---------- */
.site-footer {
  flex-shrink: 0;
  position: relative;
  background: var(--bg-panel);
  border-top: 2px solid var(--border-dim);
  margin-top: 80px;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  width: 180px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-orange), transparent);
}

.site-footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 56px 24px 24px;
}

.site-footer__brand {
  max-width: 440px;
}

.site-footer__statement {
  margin-top: 16px;
  padding-left: 16px;
  border-left: 3px solid var(--accent-orange);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-silver);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
  margin-top: 40px;
  padding: 32px 0 40px;
  border-top: 1px solid var(--border-dim);
  border-bottom: 1px solid var(--border-dim);
}

.site-footer__section {
  min-width: 0;
}

.site-footer__heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-orange);
}

.site-footer__heading::before {
  content: '▸';
  color: var(--accent-red);
  font-size: 15px;
  line-height: 1;
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__list li {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-silver);
}

.site-footer__list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-silver);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.site-footer__list a::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--border-dim);
  transform: rotate(45deg);
  flex-shrink: 0;
  transition: background 0.2s var(--ease);
}

.site-footer__list a:hover {
  color: var(--text-bright);
  transform: translateX(3px);
}

.site-footer__list a:hover::before {
  background: var(--accent-orange);
}

.site-footer__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 20px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--text-silver);
}

/* ---------- 7. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border: none;
  border-radius: 0;
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: filter 0.2s var(--ease), transform 0.2s var(--ease),
    background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent-red), var(--accent-orange));
  color: var(--text-bright);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.btn--primary:hover {
  filter: brightness(1.12);
  transform: translateX(2px);
  color: var(--text-bright);
}

.btn--ghost {
  background: transparent;
  border: 1px solid var(--border-dim);
  color: var(--text-silver);
}

.btn--ghost:hover {
  border-color: var(--accent-orange);
  color: var(--text-bright);
}

.breadcrumb {
  margin: 24px 0;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--text-silver);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: '/';
  color: var(--border-dim);
  font-size: 13px;
}

.breadcrumb__link {
  color: var(--text-silver);
  transition: color 0.2s var(--ease);
}

.breadcrumb__link:hover {
  color: var(--accent-orange);
}

.breadcrumb__item[aria-current="page"] {
  color: var(--text-bright);
  font-weight: 600;
}

.section {
  padding: var(--space-section) 0;
}

.section--tint {
  background: rgba(22, 26, 36, 0.5);
  border-top: 1px solid var(--border-dim);
  border-bottom: 1px solid var(--border-dim);
}

.section__header {
  max-width: 720px;
  margin-bottom: 40px;
}

.section__eyebrow {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent-orange);
  margin-bottom: 10px;
}

.section__eyebrow::before {
  content: '▸ ';
  color: var(--accent-red);
}

.section__title {
  font-size: clamp(28px, 3.4vw, 38px);
  margin-bottom: 12px;
}

.section__lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-silver);
}

.data-panel {
  position: relative;
  background: var(--bg-panel);
  border: 2px solid var(--border-dim);
  border-radius: 0;
  padding: 28px 24px 24px;
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.35);
}

.data-panel__label {
  display: inline-block;
  position: absolute;
  top: -13px;
  left: 16px;
  padding: 5px 14px;
  background: linear-gradient(135deg, var(--accent-red), var(--accent-orange));
  color: var(--text-bright);
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.4;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--bg-panel);
  border: 1px solid var(--border-dim);
  aspect-ratio: 16 / 9;
}

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

.image-frame--tall {
  aspect-ratio: 4 / 5;
}

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

.image-frame--square {
  aspect-ratio: 1 / 1;
}

.image-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-left: 16px solid transparent;
  border-bottom: 16px solid rgba(255, 122, 46, 0.75);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--bg-panel);
  border: 1px solid var(--border-dim);
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--text-silver);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
}

.tag::before {
  content: '';
  width: 5px;
  height: 5px;
  background: var(--accent-orange);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.data-num {
  font-family: var(--font-data);
  color: var(--data-gold);
}

.data-em {
  font-family: var(--font-data);
  font-style: italic;
  font-weight: 700;
  color: var(--data-gold);
}

[data-spy-link] {
  border-left: 2px solid transparent;
  padding-left: 14px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

[data-spy-link].is-active {
  color: var(--text-bright);
  border-left-color: var(--accent-orange);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- 8. 响应式 ---------- */
@media (max-width: 991px) {
  .layout-split,
  .layout-split--flip {
    grid-template-columns: 1fr;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 767px) {
  body {
    font-size: 14px;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section {
    padding: 48px 0;
  }

  .section__header {
    margin-bottom: 28px;
  }

  .site-header__inner {
    padding: 12px 16px 0;
  }

  .site-header__top {
    justify-content: space-between;
  }

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

  .site-header__nav-wrap {
    display: none;
    width: 100%;
    padding: 0;
  }

  .site-header__nav-wrap[data-open] {
    display: block;
    margin-top: 14px;
    padding-top: 4px;
    border-top: 1px solid var(--border-dim);
  }

  .site-nav[data-open] {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    padding: 13px 4px;
    border-bottom: 1px solid rgba(44, 48, 64, 0.5);
    font-size: 15px;
  }

  .site-nav__link::after {
    display: none;
  }

  .site-footer {
    margin-top: 48px;
  }

  .site-footer__inner {
    padding: 40px 16px 20px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .site-footer__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .site-header__nav-wrap[data-open] .site-nav__link {
    border-bottom-color: rgba(44, 48, 64, 0.6);
  }
}

/* ---------- 9. 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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