/* ==========================================================================
   亿万体育 · /assets/site.css
   共享外壳：reset、变量、中文排版、头部、页脚、通用组件
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, p, ul, ol, figure, blockquote {
  margin: 0;
}

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

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

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

button {
  background: none;
  border: 0;
  cursor: pointer;
}

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

/* ---------- CSS 变量 ---------- */
:root {
  --ink-950: #071713;
  --ink-900: #0b1f1a;
  --ink-850: #0e2621;
  --ink-800: #123029;
  --ink-700: #1b4036;
  --lake-900: #0a2f3a;
  --lake-800: #0f4c5c;
  --lake-600: #176b7d;
  --lake-400: #3fa7b8;
  --lime-400: #c8ff3d;
  --lime-300: #dcff88;
  --orange-500: #ff5a36;
  --orange-400: #ff7a5c;
  --paper-050: #f4f7f4;
  --paper-100: #e7ece6;
  --paper-200: #d3dbd2;
  --mist-500: #91a29a;
  --mist-300: #b9c6bf;
  --line-soft: rgba(200, 255, 61, 0.16);

  --font-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Roboto Mono", "Courier New", monospace;

  --step-900: clamp(2.6rem, 7vw, 5.6rem);
  --step-700: clamp(2rem, 4.4vw, 3.4rem);
  --step-500: clamp(1.5rem, 2.6vw, 2.1rem);
  --step-400: clamp(1.25rem, 1.8vw, 1.55rem);
  --step-300: 1.125rem;
  --step-200: 1rem;
  --step-100: 0.875rem;
  --step-050: 0.75rem;

  --shell-max: 1200px;
  --shell-pad: clamp(1.15rem, 4vw, 3rem);
  --radius-sm: 4px;
  --radius-md: 10px;

  --shadow-lift: 0 22px 48px -28px rgba(7, 23, 19, 0.75);
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础排版 ---------- */
body {
  min-height: 100vh;
  background:
    radial-gradient(1100px 620px at 88% -8%, rgba(23, 107, 125, 0.35), transparent 62%),
    radial-gradient(760px 520px at 4% 8%, rgba(200, 255, 61, 0.08), transparent 60%),
    var(--ink-950);
  color: var(--paper-050);
  font-family: var(--font-display);
  font-size: var(--step-200);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 { font-size: var(--step-900); }
h2 { font-size: var(--step-700); }
h3 { font-size: var(--step-500); }
h4 { font-size: var(--step-400); }

p {
  max-width: 68ch;
  text-wrap: pretty;
}

strong {
  font-weight: 800;
  color: var(--lime-300);
}

::selection {
  background: var(--lime-400);
  color: var(--ink-950);
}

:focus-visible {
  outline: 3px solid var(--lime-400);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 200;
  padding: 0.7rem 1.1rem;
  background: var(--lime-400);
  color: var(--ink-950);
  font-size: var(--step-100);
  font-weight: 800;
  border-radius: var(--radius-sm);
  transform: translateY(-160%);
  transition: transform 0.24s var(--ease);
}

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

/* ---------- 头部 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(7, 23, 19, 0.72), rgba(7, 23, 19, 0));
  transition: background-color 0.35s var(--ease), backdrop-filter 0.35s var(--ease), border-color 0.35s var(--ease);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(7, 23, 19, 0.94);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line-soft);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 3px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--lime-400), var(--lake-400) 55%, var(--orange-500));
}

.header-inner {
  width: min(100%, var(--shell-max));
  margin-inline: auto;
  padding: 0.75rem var(--shell-pad);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  justify-content: space-between;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
}

.brand__mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--ink-950);
  background: var(--lime-400);
  border-radius: 2px 14px 2px 14px;
  box-shadow: 6px 6px 0 -2px rgba(23, 107, 125, 0.85);
  transform: rotate(-3deg);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-size: var(--step-300);
  font-weight: 900;
  letter-spacing: 0.06em;
}

.brand__sub {
  font-size: var(--step-050);
  color: var(--lake-400);
  letter-spacing: 0.34em;
}

/* 导航 */
.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.4rem, 1.4vw, 1.5rem);
}

.primary-nav__list a {
  position: relative;
  display: block;
  padding: 0.5rem 0.25rem;
  font-size: var(--step-100);
  font-weight: 700;
  color: var(--mist-300);
  letter-spacing: 0.04em;
  transition: color 0.24s var(--ease), transform 0.24s var(--ease);
}

.primary-nav__list a::after {
  content: "";
  position: absolute;
  left: 0.25rem;
  right: 0.25rem;
  bottom: 0.15rem;
  height: 2px;
  background: var(--lime-400);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease);
}

.primary-nav__list a:hover,
.primary-nav__list a:focus-visible {
  color: var(--paper-050);
  transform: translateY(-1px);
}

.primary-nav__list a:hover::after,
.primary-nav__list a:focus-visible::after,
.primary-nav__list a[aria-current="page"]::after {
  transform: scaleX(1);
}

.primary-nav__list a[aria-current="page"] {
  color: var(--lime-400);
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.6rem 0.9rem;
  color: var(--paper-050);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: rgba(11, 31, 26, 0.7);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--lime-400);
  transition: transform 0.28s var(--ease), opacity 0.2s linear;
}

.nav-toggle__label {
  font-size: var(--step-050);
  letter-spacing: 0.2em;
}

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

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 9vw, 7rem);
  background:
    linear-gradient(180deg, rgba(15, 76, 92, 0.28), rgba(7, 23, 19, 0.96) 42%),
    var(--ink-950);
  border-top: 1px solid var(--line-soft);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(90px, 22vw, 260px);
  height: 4px;
  background: linear-gradient(90deg, var(--lime-400), var(--orange-500));
}

.footer-inner {
  width: min(100%, var(--shell-max));
  margin-inline: auto;
  padding: clamp(2.4rem, 6vw, 4.2rem) var(--shell-pad) 1.6rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr));
  gap: clamp(1.6rem, 4vw, 3rem);
}

.footer-col__title {
  font-size: var(--step-100);
  font-weight: 800;
  letter-spacing: 0.26em;
  color: var(--lime-400);
  margin-bottom: 1.1rem;
}

.footer-desc {
  margin-top: 1rem;
  max-width: 34ch;
  font-size: var(--step-100);
  color: var(--mist-300);
}

.brand--footer .brand__mark {
  box-shadow: 6px 6px 0 -2px rgba(255, 90, 54, 0.85);
}

.footer-links li + li {
  margin-top: 0.55rem;
}

.footer-links a {
  font-size: var(--step-100);
  color: var(--mist-300);
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--lime-300);
  border-bottom-color: var(--lime-400);
}

.footer-contact li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.65rem;
  font-size: var(--step-100);
  color: var(--mist-300);
  padding: 0.4rem 0;
}

.footer-contact li + li {
  border-top: 1px solid rgba(145, 162, 154, 0.18);
}

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: var(--step-050);
  letter-spacing: 0.16em;
  color: var(--lake-400);
}

.footer-contact a:hover,
.footer-contact a:focus-visible {
  color: var(--lime-300);
}

.footer-base {
  margin-top: clamp(2rem, 5vw, 3.2rem);
  padding-top: 1.2rem;
  border-top: 1px solid rgba(145, 162, 154, 0.2);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.6rem;
  justify-content: space-between;
  font-size: var(--step-050);
  color: var(--mist-500);
  letter-spacing: 0.06em;
}

.footer-base a {
  color: var(--mist-300);
  border-bottom: 1px dashed rgba(145, 162, 154, 0.5);
}

.footer-base a:hover,
.footer-base a:focus-visible {
  color: var(--lime-400);
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: clamp(0.9rem, 3vw, 2rem);
  bottom: clamp(0.9rem, 3vw, 2rem);
  z-index: 120;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  color: var(--ink-950);
  background: var(--lime-400);
  border-radius: 50%;
  box-shadow: var(--shadow-lift);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease), visibility 0.28s;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: var(--paper-050);
}

/* ---------- 正文容器与通用组件 ---------- */
.main-content {
  display: block;
  padding-top: var(--header-h);
}

.page-shell {
  width: min(100%, var(--shell-max));
  margin-inline: auto;
  padding: clamp(2rem, 5vw, 4rem) var(--shell-pad);
}

.page-shell--wide {
  width: min(100%, 1360px);
}

.page-shell__lead {
  max-width: 62ch;
  font-size: var(--step-300);
  color: var(--mist-300);
  margin-top: 1.2rem;
}

.page-shell__grid {
  display: grid;
  gap: clamp(1.4rem, 3.4vw, 2.6rem);
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  margin-top: clamp(2rem, 5vw, 3.2rem);
}

/* 面包屑 */
.breadcrumb {
  font-size: var(--step-050);
  letter-spacing: 0.14em;
  color: var(--mist-500);
  margin-bottom: 1.4rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb__list li + li::before {
  content: "／";
  color: var(--lake-400);
  margin-right: 0.5rem;
}

.breadcrumb__list a:hover,
.breadcrumb__list a:focus-visible {
  color: var(--lime-400);
}

.breadcrumb__list [aria-current="page"] {
  color: var(--paper-050);
}

/* 色带分区 */
.section-band {
  position: relative;
  padding: clamp(2.2rem, 6vw, 4.4rem) var(--shell-pad);
  border-block: 1px solid var(--line-soft);
  overflow: hidden;
}

.section-band--lime {
  background:
    repeating-linear-gradient(-45deg, rgba(200, 255, 61, 0.06) 0 12px, transparent 12px 24px),
    var(--ink-850);
}

.section-band--blue {
  background: linear-gradient(135deg, var(--lake-900), var(--ink-900));
}

.section-band--orange {
  background: linear-gradient(135deg, rgba(255, 90, 54, 0.16), rgba(11, 31, 26, 0.9));
}

/* 比分牌卡片 */
.stat-card {
  position: relative;
  padding: clamp(1.2rem, 3vw, 1.9rem);
  background: rgba(11, 31, 26, 0.72);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), background-color 0.28s var(--ease);
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(1.2rem, 3vw, 1.9rem);
  width: 52px;
  height: 3px;
  background: var(--lime-400);
}

.stat-card:hover,
.stat-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(200, 255, 61, 0.42);
  background: rgba(18, 48, 41, 0.9);
}

.stat-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime-400);
  letter-spacing: -0.02em;
}

.stat-card__label {
  display: block;
  margin-top: 0.7rem;
  font-size: var(--step-100);
  letter-spacing: 0.16em;
  color: var(--mist-300);
}

/* 目录式索引列表 */
.index-list {
  counter-reset: entry;
  border-top: 1px solid var(--line-soft);
}

.index-list > li {
  counter-increment: entry;
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 1.2rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background-color 0.24s var(--ease), padding-left 0.24s var(--ease);
}

.index-list > li:hover {
  background: rgba(200, 255, 61, 0.05);
  padding-left: 0.6rem;
}

.index-list__num {
  font-family: var(--font-mono);
  font-size: var(--step-400);
  font-weight: 700;
  color: var(--lake-400);
  line-height: 1.1;
}

.index-list__num::before {
  content: counter(entry, decimal-leading-zero);
}

.index-list__body h3 {
  font-size: var(--step-400);
}

.index-list__body p {
  margin-top: 0.4rem;
  font-size: var(--step-100);
  color: var(--mist-300);
}

/* 斜向印刷标签 */
.edge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.32rem 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--step-050);
  letter-spacing: 0.18em;
  color: var(--ink-950);
  background: var(--lime-400);
  border-radius: 2px 10px 2px 10px;
  transform: rotate(-2deg);
}

.edge-tag--orange {
  background: var(--orange-500);
  color: var(--paper-050);
}

.edge-tag--outline {
  background: transparent;
  color: var(--lime-400);
  border: 1px solid var(--lime-400);
}

/* 旁注 */
.side-note {
  font-size: var(--step-050);
  letter-spacing: 0.2em;
  color: var(--lake-400);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.side-note--right {
  margin-left: auto;
}

/* 图片容器 */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background:
    repeating-linear-gradient(135deg, rgba(23, 107, 125, 0.24) 0 10px, rgba(7, 23, 19, 0.6) 10px 20px);
  aspect-ratio: 16 / 9;
}

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

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

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.media-frame:hover .media-frame__img {
  transform: scale(1.04);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 0.7rem 0.9rem;
  font-size: var(--step-050);
  letter-spacing: 0.08em;
  color: var(--paper-100);
  background: linear-gradient(0deg, rgba(7, 23, 19, 0.9), transparent);
}

/* 按钮 */
.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.8rem 1.4rem;
  font-size: var(--step-100);
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--ink-950);
  background: var(--lime-400);
  border-radius: var(--radius-sm);
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease), color 0.24s var(--ease);
}

.cta-link::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform 0.24s var(--ease);
}

.cta-link:hover,
.cta-link:focus-visible {
  transform: translateY(-2px);
  background: var(--paper-050);
}

.cta-link:hover::after,
.cta-link:focus-visible::after {
  transform: translateX(4px);
}

.cta-link--ghost {
  background: transparent;
  color: var(--lime-400);
  border: 1px solid var(--lime-400);
}

.cta-link--ghost:hover,
.cta-link--ghost:focus-visible {
  background: rgba(200, 255, 61, 0.12);
  color: var(--lime-300);
}

.cta-link--warm {
  background: var(--orange-500);
  color: var(--paper-050);
}

.cta-link--warm:hover,
.cta-link--warm:focus-visible {
  background: var(--orange-400);
  color: var(--ink-950);
}

/* 显现 */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .primary-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background: rgba(7, 23, 19, 0.98);
    border-bottom: 1px solid var(--line-soft);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.36s var(--ease);
  }

  .primary-nav[data-open] {
    max-height: 70vh;
    overflow-y: auto;
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.6rem var(--shell-pad) 1.4rem;
  }

  .primary-nav__list li + li {
    border-top: 1px solid rgba(145, 162, 154, 0.18);
  }

  .primary-nav__list a {
    padding: 1rem 0.2rem;
    font-size: var(--step-300);
  }

  .primary-nav__list a::after {
    left: 0.2rem;
    bottom: 0.5rem;
  }
}

@media (max-width: 560px) {
  :root {
    --header-h: 64px;
  }

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

  .index-list > li {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .side-note {
    writing-mode: horizontal-tb;
  }
}

@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;
  }

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

@media print {
  .site-header,
  .back-to-top,
  .scroll-progress {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }
}