/* ============ 小鸟体育全局共享样式 ============ */
/* 禁止外部依赖，仅本地CSS变量与原生规则 */

:root {
  --color-orange: #FF7A00;
  --color-orange-soft: #FFE3C4;
  --color-yellow: #FFC700;
  --color-blue: #1B3A5C;
  --color-blue-deep: #0E2A47;
  --color-gray: #F5F5F5;
  --color-white: #FFFFFF;
  --color-green: #0E3B2E;
  --color-gray-dark: #2C2C2C;
  --color-link: #3498DB;
  --color-border-strong: #1B3A5C;
  --color-border-light: #E3E3E3;
  --font-headline: Georgia, "Times New Roman", serif;
  --font-body: Helvetica, Arial, sans-serif;
  --font-mono: Consolas, monospace;
  --header-h: 72px;
  --footer-bg: var(--color-blue);
  --duration: 0.35s;
  --shadow-soft: 0 8px 24px rgba(27, 58, 92, 0.12);
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-gray);
  color: var(--color-gray-dark);
  line-height: 1.7;
  font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 0.75em;
  color: var(--color-blue);
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--color-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-orange);
}

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
}

[hidden] {
  display: none !important;
}

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

.container {
  width: min(1200px, 92vw);
  margin-inline: auto;
}

/* 通用按钮族 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65em 1.5em;
  background: var(--color-orange);
  border: 2px solid var(--color-orange);
  color: #FFFFFF;
  font-weight: 800;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.4;
  text-decoration: none;
  border-radius: 4px;
  transition: background var(--duration) ease, color var(--duration) ease, box-shadow var(--duration) ease, transform var(--duration) ease;
}

.btn-primary:hover {
  background: #E96A00;
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(255, 122, 0, 0.32);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65em 1.5em;
  background: transparent;
  border: 2px solid var(--color-blue);
  color: var(--color-blue);
  font-weight: 800;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.4;
  text-decoration: none;
  border-radius: 4px;
  transition: background var(--duration) ease, color var(--duration) ease, border-color var(--duration) ease, transform var(--duration) ease;
}

.btn-outline:hover {
  background: var(--color-blue);
  color: #FFFFFF;
  border-color: var(--color-blue);
}

/* 资料卡与通用信息区 */
.pane {
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: 6px;
  padding: 1.5rem;
  position: relative;
}

.pane::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-orange);
  opacity: 0.8;
  border-radius: 6px 0 0 6px;
}

.stat-line {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--color-blue);
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
}

.section-heading {
  font-size: clamp(1.7rem, 4vw, 2.8rem);
  color: var(--color-blue);
  letter-spacing: -0.02em;
}

.section-heading .section-no {
  display: inline-block;
  background: var(--color-orange);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.65em;
  font-weight: 700;
  padding: 0.2em 0.6em;
  border-radius: 3px;
  margin-right: 0.4em;
  vertical-align: middle;
}

/* ============ 图片占位容器基础规则 ============ */
/* 供页面阶段放置真实图片，视觉上保持晨光档案感 */
.image-frame {
  position: relative;
  background: var(--color-blue);
  border-radius: 6px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-frame::after {
  content: "IMAGE";
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: rgba(255, 255, 255, 0.7);
  background: linear-gradient(135deg, #0E2A47 0%, #1B3A5C 48%, #FF7A00 100%);
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============ 页头区域 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: var(--color-blue);
  border-bottom: 3px solid var(--color-orange);
  box-shadow: 0 2px 12px rgba(27, 58, 92, 0.35);
}

.header-inner {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: clamp(1rem, 3vw, 2rem);
}

/* 品牌与鸟形剪影 */
.logo-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  padding: 0.75rem 0;
  min-width: max-content;
}

.logo-text {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  line-height: 1;
}

.site-title {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.45rem;
  color: #FFFFFF;
  letter-spacing: 0.01em;
}

.brand-time {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  background: var(--color-yellow);
  color: var(--color-blue-deep);
  padding: 0.2rem 0.55rem;
  border-radius: 3px;
  letter-spacing: 0.06em;
}

.bird-mark {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 34px;
  flex-shrink: 0;
}

.bird-body {
  position: absolute;
  left: 8px;
  top: 14px;
  width: 15px;
  height: 10px;
  background: #FFFFFF;
  border-radius: 50% 55% 45% 50%;
  transform: rotate(-8deg);
}

.bird-wing {
  position: absolute;
  left: 8px;
  top: 8px;
  width: 16px;
  height: 8px;
  background: var(--color-orange);
  border-radius: 100% 0 100% 0;
  transform: rotate(-15deg);
  box-shadow: 0 2px 0 var(--color-orange-soft);
  transition: transform var(--duration) ease;
}

.logo-wrap:hover .bird-wing {
  transform: rotate(-28deg) translateY(-2px);
}

.bird-point {
  position: absolute;
  left: 23px;
  top: 11px;
  width: 8px;
  height: 3px;
  background: var(--color-yellow);
  border-radius: 2px;
  transform: rotate(22deg);
}

.bird-mark-footer {
  width: 38px;
  height: 34px;
}

.bird-mark-footer .bird-body {
  background: var(--color-orange);
}

.bird-mark-footer .bird-wing {
  background: var(--color-yellow);
}

.bird-mark-footer .bird-point {
  background: var(--color-white);
}

/* 框架式导航 */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex: 1 1 auto;
  gap: 1.2rem;
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: clamp(0.7rem, 2vw, 2.2rem);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.45rem 0;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color var(--duration) ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 3px;
  background: var(--color-orange);
  transition: width var(--duration) ease;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: #FFFFFF;
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

.nav-meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding-left: 1rem;
  border-left: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.7);
  font-family: var(--font-mono);
  line-height: 1.3;
  letter-spacing: 0.03em;
}

.nav-time {
  color: var(--color-yellow);
  font-weight: 700;
}

/* 导航切换按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  align-self: center;
  padding: 0;
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.7);
  border-radius: 6px;
  cursor: pointer;
  transition: border-color var(--duration) ease, background-color var(--duration) ease;
}

.nav-toggle .toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background: #FFFFFF;
  margin-inline: auto;
  transition: transform var(--duration) ease, opacity var(--duration) ease;
}

.nav-toggle:hover {
  border-color: var(--color-yellow);
}

.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 跳转链接 */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 2000;
  background: var(--color-yellow);
  color: var(--color-blue-deep);
  font-weight: 800;
  padding: 0.65rem 1.2rem;
  border-radius: 4px;
  text-decoration: none;
  transform: translateY(-200%);
  opacity: 0;
  transition: transform var(--duration) ease, opacity var(--duration) ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
  opacity: 1;
  outline: 3px solid #FFFFFF;
  outline-offset: 2px;
}

/* 阅读进度条 */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1200;
  width: 100%;
  height: 4px;
  pointer-events: none;
  background: rgba(255, 199, 0, 0.18);
}

.reading-progress-bar {
  width: 0%;
  height: 100%;
  background: var(--color-yellow);
  box-shadow: 0 0 8px rgba(255, 199, 0, 0.55);
  transition: width 0.1s linear;
}

/* 移动端导航抽屉 */
@media (max-width: 960px) {
  :root {
    --header-h: 60px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: calc(var(--header-h) + 1.5rem) 2rem 2rem;
    background: var(--color-blue);
    border-left: 4px solid var(--color-orange);
    box-shadow: -8px 0 30px rgba(0, 0, 0, 0.3);
    gap: 0;
    z-index: 990;
    transform: translateY(-100%);
    transition: transform var(--duration) ease, opacity var(--duration) ease;
    opacity: 0;
    pointer-events: none;
    overflow-y: auto;
    border-bottom: 4px solid var(--color-yellow);
  }

  .site-nav[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
    width: 100%;
    margin-bottom: 1.5rem;
  }

  .nav-link {
    font-size: 1rem;
    padding: 0.8rem 0;
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.9);
  }

  .nav-link::after {
    left: 0;
    bottom: -1px;
  }

  .nav-meta {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 1rem;
    width: 100%;
  }

  .logo-wrap {
    padding: 0.65rem 0;
  }

  .site-title {
    font-size: 1.2rem;
  }
}

@media (max-width: 960px) and (prefers-reduced-motion: reduce) {
  .site-nav {
    transition: none;
  }
}

/* ============ 页脚区域 ============ */
.site-footer {
  position: relative;
  margin-top: 4rem;
  background: var(--color-footer-bg);
  color: rgba(255, 255, 255, 0.82);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 122, 0, 0.14) 0%, transparent 38%),
    radial-gradient(circle at 85% 12%, rgba(255, 199, 0, 0.1) 0%, transparent 30%),
    linear-gradient(180deg, var(--color-blue) 0%, #0E2A47 100%);
  pointer-events: none;
}

.footer-wave {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--color-blue) 0%, var(--color-yellow) 45%, var(--color-orange) 100%);
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.3fr 1fr 0.9fr;
  gap: 3rem;
  padding: 3.5rem 0 2.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  margin-bottom: 1rem;
}

.footer-brand .site-title,
.footer-logo .site-title {
  color: #FFFFFF;
  font-size: 1.3rem;
}

.footer-claim {
  font-family: var(--font-headline);
  font-size: 1rem;
  color: var(--color-orange-soft);
  margin-bottom: 0.5rem;
  letter-spacing: 0.04em;
}

.footer-trust {
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.7);
  max-width: 42ch;
  margin-bottom: 0;
}

.footer-heading {
  font-family: var(--font-headline);
  font-size: 0.92rem;
  color: var(--color-yellow);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1.2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.22);
  padding-bottom: 0.6rem;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.contact-item {
  display: flex;
  gap: 0.75rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

.contact-label {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-orange-soft);
  background: rgba(255, 122, 0, 0.16);
  border: 1px solid rgba(255, 122, 0, 0.45);
  padding: 0.1rem 0.55rem;
  border-radius: 3px;
  align-self: flex-start;
  margin-top: 0.2rem;
}

.contact-value {
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  word-break: break-word;
}

.contact-value[href]:hover {
  color: var(--color-yellow);
  text-decoration: underline;
}

.footer-note {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.58);
  margin-top: 1rem;
  border-left: 3px solid var(--color-orange);
  padding-left: 0.8rem;
}

.footer-links {
  min-width: 0;
}

.footer-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem 1rem;
}

.footer-link {
  display: inline-block;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 0.12rem 0;
  transition: color var(--duration) ease, transform var(--duration) ease;
}

.footer-link::before {
  content: "→ ";
  font-family: var(--font-mono);
  color: var(--color-yellow);
}

.footer-link:hover {
  color: var(--color-yellow);
  transform: translateX(3px);
}

.footer-meta {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(14, 42, 71, 0.55);
}

.footer-meta-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.5rem;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem 0;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: rgba(255, 255, 255, 0.65);
}

.meta-copyright,
.meta-beian {
  letter-spacing: 0.04em;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding-top: 2.5rem;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }

  .footer-brand {
    grid-column: auto;
  }

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

  .footer-meta-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ============ 通用排版与正文容器 ============ */
.main-content {
  min-height: 60vh;
}

.prose {
  max-width: 68ch;
}

.prose p {
  margin-bottom: 1.25em;
}

.prose a {
  color: var(--color-link);
}

.prose a:hover {
  color: var(--color-orange);
}

/* 基础网格系统 */
.grid {
  display: grid;
  gap: 1.25rem;
}

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

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

@media (max-width: 720px) {
  .grid-cols-2,
  .grid-cols-3 {
    grid-template-columns: 1fr;
  }
}

/* 高频章节容器 */
.section {
  display: block;
  padding: clamp(2.5rem, 7vw, 5rem) 0;
}

.section-tight {
  padding: 2rem 0;
}

/* 面包屑 */
.breadcrumb {
  font-size: 0.82rem;
  color: var(--color-blue);
  margin-bottom: 1rem;
  padding: 0.5rem 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb a {
  color: var(--color-link);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-orange);
  text-decoration: underline;
}

.breadcrumb .crumb-sep {
  color: var(--color-orange);
  font-family: var(--font-mono);
}

/* 深色区块与节奏色带 */
.strip {
  display: block;
  background: var(--color-blue);
  color: #FFFFFF;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  margin: 2.5rem 0;
}

.strip-orange {
  background: var(--color-orange-soft);
  border-top: 2px solid var(--color-orange);
  border-bottom: 2px solid var(--color-orange);
}

.strip-blue {
  background: var(--color-blue);
  box-shadow: inset 0 0 0 999px rgba(14, 42, 71, 0.12);
}

/* ============ 焦点与辅助功能 ============ */
:focus-visible {
  outline: 3px solid var(--color-orange);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reading-progress-bar {
    transition: none;
  }

  .nav-link::after,
  .logo-wrap .bird-wing {
    transition: none;
  }

  .footer-link {
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ============ 章节导航高亮关联锚点 ============ */
.section-host {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* 头部固定时正文不被遮挡的辅助类 */
.site-header-spacer {
  height: var(--header-h);
}
@media (max-width: 960px) {
  .site-header-spacer {
    height: var(--header-h);
  }
}

/* 打印基础 */
@media print {
  .site-header,
  .site-footer,
  .reading-progress,
  .nav-toggle {
    display: none !important;
  }

  body {
    background: #FFFFFF;
    color: #000000;
  }
}