/* ==========================================================
   BET365亚洲体育 · 全站共享 CSS
   /assets/site.css
   ========================================================== */

/* ---------- CSS 变量 ---------- */
:root {
  --c-bg: #0B1E36;
  --c-bg-deep: #071628;
  --c-primary: #0A1B2A;
  --c-secondary: #1D3B5B;
  --c-surface: #122A44;
  --c-border: #2E4A6E;
  --c-text: #E6EEF5;
  --c-muted: #8FA7C0;
  --c-accent: #FF7A00;
  --c-highlight: #00FF88;
  --c-warning: #FFD166;

  --f-head: 'Archivo Black', 'Arial Black', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --f-body: 'Inter', 'Roboto', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --f-mono: 'JetBrains Mono', 'SFMono-Regular', 'Consolas', 'Courier New', monospace;

  --header-h: 72px;
  --container-w: 1280px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --gap: clamp(1rem, 3vw, 2rem);
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scrollbar-color: var(--c-border) var(--c-bg-deep);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--f-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-bg);
  background-image: linear-gradient(180deg, var(--c-bg-deep) 0, var(--c-bg) 480px);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--c-accent);
  color: var(--c-bg-deep);
}

/* ---------- 基础元素 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--f-head);
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-text);
  letter-spacing: -0.01em;
}

p {
  color: var(--c-text);
}

a {
  color: var(--c-text);
  text-decoration: none;
  transition: color 0.15s var(--ease);
}

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

ul,
ol {
  list-style: none;
}

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

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

button {
  border: none;
  background: none;
  cursor: pointer;
}

input,
textarea,
select {
  width: 100%;
  padding: 0.7rem 1rem;
  color: var(--c-text);
  background: var(--c-primary);
  border: 1px solid var(--c-border);
  border-radius: 0;
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--c-highlight);
  box-shadow: 0 0 0 2px rgba(0, 255, 136, 0.15);
}

label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--c-muted);
}

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

/* ---------- 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
}

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

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

.grid--tight {
  gap: 1rem;
}

@media (max-width: 900px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: var(--c-highlight);
  color: var(--c-bg-deep);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  transform: translateY(-120%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(10, 27, 42, 0.72);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  backdrop-filter: blur(12px) saturate(160%);
  border-bottom: 1px solid var(--c-border);
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.site-header[data-scrolled] {
  background-color: rgba(7, 22, 40, 0.92);
  box-shadow: 0 12px 28px rgba(2, 12, 28, 0.45);
}

.site-header__progress {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  display: block;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-highlight) 100%);
  pointer-events: none;
  transition: width 0.08s linear;
}

.site-header__bar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.35rem;
  height: 2.35rem;
  background: var(--c-accent);
  color: var(--c-bg-deep);
  font-family: var(--f-mono);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.brand__title {
  font-family: var(--f-head);
  font-size: 1.1rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand__title span {
  font-family: var(--f-body);
  font-weight: 700;
  color: var(--c-highlight);
  margin-left: 0.2rem;
}

.brand:hover .brand__mark {
  background: var(--c-highlight);
  color: var(--c-bg-deep);
}

.brand--footer .brand__mark {
  background: var(--c-highlight);
}

.brand--footer:hover .brand__mark {
  background: var(--c-accent);
}

/* ---------- 导航 ---------- */
.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 0.15s var(--ease);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.35rem;
  height: 2px;
  background: var(--c-highlight);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.site-nav__link:hover {
  color: var(--c-highlight);
}

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

.site-nav__link[aria-current='page'] {
  color: var(--c-highlight);
}

.site-nav__link[aria-current='page']::after {
  background: var(--c-accent);
}

.site-nav__num {
  font-family: var(--f-mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--c-accent);
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 0.5rem;
  color: var(--c-text);
  background: transparent;
  border: 1px solid transparent;
  transition: color 0.15s var(--ease);
}

.nav-toggle:hover {
  color: var(--c-highlight);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 1.25rem;
  height: 0.75rem;
}

.nav-toggle__bar {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle__bar:nth-child(1) {
  top: 0;
}

.nav-toggle__bar:nth-child(2) {
  top: calc(50% - 1px);
}

.nav-toggle__bar:nth-child(3) {
  top: auto;
  bottom: 0;
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(1) {
  top: calc(50% - 1px);
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(3) {
  top: calc(50% - 1px);
  transform: rotate(-45deg);
}

.nav-toggle__text {
  font-size: 0.6rem;
  line-height: 1;
  letter-spacing: 0.18em;
  color: var(--c-muted);
}

.nav-toggle[aria-expanded='true'] .nav-toggle__text {
  color: var(--c-highlight);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 4rem;
  overflow: hidden;
  background: var(--c-bg-deep);
  border-top: 3px solid var(--c-accent);
  color: var(--c-muted);
}

.site-footer::before {
  content: '365';
  position: absolute;
  right: clamp(1rem, 6vw, 5rem);
  bottom: clamp(3rem, 8vw, 6rem);
  z-index: 0;
  font-family: var(--f-head);
  font-size: clamp(8rem, 20vw, 16rem);
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(255, 255, 255, 0.025);
  pointer-events: none;
}

.site-footer__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.4fr;
  gap: 2.5rem;
  max-width: var(--container-w);
  margin-inline: auto;
  padding: 3rem var(--gutter) 2.25rem;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.65rem;
}

.site-footer__note {
  font-family: var(--f-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--c-accent);
  margin-top: 0.35rem;
}

.site-footer__trust {
  max-width: 22rem;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--c-muted);
}

.site-footer__title {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-border);
  font-family: var(--f-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.site-footer__links {
  display: grid;
  gap: 0.55rem;
}

.site-footer__links a {
  color: var(--c-text);
  font-size: 0.88rem;
  transition: color 0.15s var(--ease);
}

.site-footer__links a:hover {
  color: var(--c-highlight);
}

.site-footer__links li {
  color: var(--c-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

.site-footer__bottom {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.4rem 2rem;
  max-width: var(--container-w);
  margin-inline: auto;
  padding: 1.1rem var(--gutter);
  border-top: 1px solid var(--c-border);
  font-size: 0.78rem;
  color: var(--c-muted);
}

.site-footer__copyright {
  color: var(--c-text);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.4rem;
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s var(--ease), color 0.15s var(--ease), border-color 0.15s var(--ease), transform 0.1s var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

.btn--accent {
  background: var(--c-accent);
  color: var(--c-bg-deep);
}

.btn--accent:hover {
  background: var(--c-highlight);
  color: var(--c-bg-deep);
}

.btn--ghost {
  background: transparent;
  border-color: var(--c-border);
  border-left-width: 3px;
  border-left-color: var(--c-accent);
  color: var(--c-text);
}

.btn--ghost:hover {
  border-color: var(--c-highlight);
  border-left-color: var(--c-highlight);
  color: var(--c-highlight);
}

.btn--highlight {
  background: var(--c-highlight);
  color: var(--c-bg-deep);
}

.btn--highlight:hover {
  background: var(--c-accent);
  color: var(--c-bg-deep);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  margin-bottom: 2rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--c-border);
  font-size: 0.82rem;
}

.breadcrumbs__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem 0.6rem;
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumbs__link {
  color: var(--c-muted);
}

.breadcrumbs__link:hover {
  color: var(--c-highlight);
}

.breadcrumbs__sep {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  color: var(--c-border);
}

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

/* ---------- 章节标题 ---------- */
.chapter {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem 1.25rem;
  margin-bottom: 2rem;
  padding-top: 0.8rem;
  padding-bottom: 0.9rem;
  border-top: 2px solid var(--c-accent);
  border-bottom: 1px solid var(--c-border);
}

.chapter__index {
  font-family: var(--f-mono);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-accent);
}

.chapter__title {
  font-size: clamp(1.15rem, 2.6vw, 1.8rem);
}

.chapter__hint {
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

@media (max-width: 640px) {
  .chapter__hint {
    margin-left: 0;
    width: 100%;
  }
}

/* ---------- 文本与分隔 ---------- */
.lead {
  max-width: 44rem;
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  line-height: 1.8;
}

.text-muted {
  color: var(--c-muted);
}

hr,
.divider {
  margin: 2rem 0;
  border: 0;
  border-top: 1px solid var(--c-border);
}

.divider--accent {
  border-top-width: 2px;
  border-top-color: var(--c-accent);
}

.blockquote {
  margin: 2rem 0;
  padding: 0.9rem 1.5rem;
  border-left: 3px solid var(--c-accent);
  background: linear-gradient(90deg, var(--c-surface), transparent);
  font-weight: 600;
  color: var(--c-text);
}

.blockquote footer {
  margin-top: 0.5rem;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--c-muted);
}

/* ---------- 面板与数据 ---------- */
.panel {
  position: relative;
  padding: 1.5rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
}

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

.panel--green-top {
  border-top: 3px solid var(--c-highlight);
}

.stat {
  display: grid;
  gap: 0.2rem;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, var(--c-surface), var(--c-primary));
  border: 1px solid var(--c-border);
}

.stat__value {
  font-family: var(--f-mono);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-highlight);
}

.stat__label {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.65rem;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  line-height: 1;
  letter-spacing: 0.06em;
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  background: var(--c-primary);
}

.tag--accent {
  color: var(--c-accent);
  border-color: var(--c-accent);
}

.tag--green {
  color: var(--c-highlight);
  border-color: var(--c-highlight);
}

.tag--solid {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg-deep);
  font-weight: 700;
}

/* ---------- 索引目录 ---------- */
.index-list {
  border-top: 1px solid var(--c-border);
}

.index-list__item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--c-border);
}

.index-list__num {
  min-width: 2.5rem;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-muted);
}

.index-list__link {
  font-weight: 600;
  color: var(--c-text);
  transition: color 0.15s var(--ease);
}

.index-list__link:hover {
  color: var(--c-highlight);
}

/* ---------- 表格 ---------- */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table-scroll .data-table {
  min-width: 560px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.data-table caption {
  padding: 0.5rem 0 0.75rem;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-align: left;
  color: var(--c-muted);
}

.data-table th,
.data-table td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--c-border);
  text-align: left;
}

.data-table th {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--c-highlight);
  border-bottom-width: 2px;
}

.data-table td {
  color: var(--c-text);
}

.data-table tbody tr {
  transition: background 0.15s var(--ease);
}

.data-table tbody tr:hover {
  background: var(--c-primary);
}

/* ---------- 图像容器 ---------- */
.img-ratio {
  position: relative;
  display: block;
  width: 100%;
  height: 0;
  overflow: hidden;
  border: 1px solid var(--c-border);
  background:
    linear-gradient(135deg, transparent 49.5%, rgba(46, 74, 110, 0.35) 50%, transparent 50.5%),
    linear-gradient(180deg, var(--c-primary), var(--c-bg));
}

.img-ratio > img,
.img-ratio > video,
.img-ratio > .img-ratio__content {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-ratio__label {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  z-index: 2;
  padding: 0.18rem 0.5rem;
  font-family: var(--f-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  background: rgba(7, 22, 40, 0.85);
  border: 1px solid var(--c-border);
}

.img-ratio--16x9 {
  padding-top: 56.25%;
}

.img-ratio--4x3 {
  padding-top: 75%;
}

.img-ratio--3x2 {
  padding-top: 66.66%;
}

.img-ratio--1x1 {
  padding-top: 100%;
}

.img-ratio--3x4 {
  padding-top: 133.33%;
}

.img-ratio--hero {
  padding-top: 42%;
}

@media (max-width: 768px) {
  .img-ratio--hero {
    padding-top: 60%;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin-left: 0;
    max-height: calc(100vh - var(--header-h) - 0.5rem);
    overflow-y: auto;
    padding: 0.25rem var(--gutter) 1rem;
    background: rgba(7, 22, 40, 0.98);
    border-bottom: 1px solid var(--c-border);
    box-shadow: 0 20px 35px rgba(0, 0, 0, 0.35);
  }

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

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

  .site-nav__item {
    border-bottom: 1px solid rgba(46, 74, 110, 0.45);
  }

  .site-nav__item:last-child {
    border-bottom: none;
  }

  .site-nav__link {
    display: flex;
    padding-block: 0.85rem;
    font-size: 1rem;
  }

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

  .site-nav__num {
    min-width: 2.25rem;
  }

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

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

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

@media (max-width: 768px) {
  .img-ratio--hero {
    padding-top: 60%;
  }
}

@media (max-width: 560px) {
  :root {
    --header-h: 62px;
  }

  .brand__mark {
    width: 2rem;
    height: 2rem;
    font-size: 0.95rem;
  }

  .brand__title {
    font-size: 0.95rem;
  }

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

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

  .site-footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}