/* ==========================================================================
   KAIYUN安装 — 共享站点样式 /assets/site.css
   视觉系统：赛事数据仪表台 · 深空蓝/暖纸色/活力橙/金色
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 色彩 */
  --space-blue: #0B1B3F;
  --warm-paper: #F5F0E6;
  --vivid-orange: #FF6B35;
  --golden: #FFD700;
  --ink: #0A0A0A;
  --mist: #E8E2D8;
  --success: #2ECC71;
  --sky-blue: #3B82F6;
  --deep-ink: #050A1A;

  /* 字体 */
  --font-display: "Impact", "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", "Consolas", "Menlo", monospace;

  /* 布局 */
  --container: 1200px;
  --gutter: 2rem;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 3rem;
  --space-5: 5rem;
  --space-6: 7rem;

  /* 效果 */
  --shadow-deep: 0 12px 32px rgba(5, 10, 26, 0.35);
  --shadow-soft: 0 4px 18px rgba(5, 10, 26, 0.12);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 0.3s;
}

/* ---------- 2. Reset 与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--warm-paper);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.12;
  color: var(--space-blue);
}

a {
  color: var(--sky-blue);
  text-underline-offset: 3px;
}

ul, ol {
  list-style: none;
}

address {
  font-style: normal;
}

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

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

/* ---------- 3. 容器与网格 ---------- */
.container {
  width: min(100% - calc(var(--gutter) * 2), var(--container));
  margin-inline: auto;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.grid--2,
.grid--3 {
  gap: var(--space-4);
}

/* ---------- 4. 无障碍 ---------- */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 3000;
  padding: 0.75rem 1.5rem;
  background: var(--vivid-orange);
  color: var(--warm-paper);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-120%);
  transition: transform var(--dur) var(--ease);
}

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

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

::selection {
  background: var(--vivid-orange);
  color: var(--warm-paper);
}

/* ---------- 5. 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2000;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--vivid-orange), var(--golden));
  pointer-events: none;
  transition: width 0.15s linear;
}

/* ---------- 6. 头部 ---------- */
.site-header {
  position: relative;
  z-index: 100;
  background-color: var(--space-blue);
  background-image:
    linear-gradient(rgba(255, 215, 0, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 215, 0, 0.035) 1px, transparent 1px);
  background-size: 36px 36px;
  color: var(--warm-paper);
}

.site-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--vivid-orange) 0%, var(--golden) 55%, transparent 100%);
  opacity: 0.9;
}

.header-top {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: min(100% - calc(var(--gutter) * 2), var(--container));
  margin-inline: auto;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(245, 240, 230, 0.12);
}

.brand-block {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  flex-shrink: 0;
}

.brand-link {
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: 0.06em;
  color: var(--warm-paper);
  text-decoration: none;
  white-space: nowrap;
}

.brand-link:hover {
  color: var(--golden);
}

.brand-tagline {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: rgba(245, 240, 230, 0.6);
  white-space: nowrap;
}

.header-icp {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: rgba(245, 240, 230, 0.45);
  white-space: nowrap;
}

.header-bottom {
  width: min(100% - calc(var(--gutter) * 2), var(--container));
  margin-inline: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 1.05rem 1.25rem;
  color: var(--warm-paper);
  text-decoration: none;
  position: relative;
  white-space: nowrap;
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 1.25rem;
  right: 1.25rem;
  bottom: 0;
  height: 3px;
  background: var(--vivid-orange);
  transform: skewX(-35deg) scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
  color: var(--warm-paper);
}

.nav-link:hover::before,
.nav-link:focus-visible::before,
.nav-link[aria-current="page"]::before {
  transform: skewX(-35deg) scaleX(1);
}

.nav-link:focus-visible {
  outline: none;
  background: rgba(255, 107, 53, 0.12);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--vivid-orange);
  letter-spacing: 0.05em;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  padding: 0.5rem;
  width: 2.5rem;
  height: 2.5rem;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  border-radius: 0;
  background: transparent;
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--warm-paper);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

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

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

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

.nav-toggle:focus-visible {
  outline: 2px solid var(--golden);
  outline-offset: 2px;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--space-6);
  background: var(--deep-ink);
  color: var(--warm-paper);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--vivid-orange) 0%, var(--golden) 25%, transparent 85%);
  z-index: 1;
}

.footer-container {
  width: min(100% - calc(var(--gutter) * 2), var(--container));
  margin-inline: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: var(--space-4);
  padding-top: var(--space-5);
  padding-bottom: var(--space-4);
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 1.75rem;
  letter-spacing: 0.08em;
  color: var(--warm-paper);
  margin-bottom: 0.75rem;
}

.footer-desc {
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(245, 240, 230, 0.72);
  max-width: 34em;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(245, 240, 230, 0.12);
}

.footer-title {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--golden);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(245, 240, 230, 0.18);
}

.footer-menu li + li {
  margin-top: 0.6rem;
}

.footer-link {
  color: rgba(245, 240, 230, 0.68);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--golden);
  padding-left: 4px;
}

.footer-contact li {
  font-size: 0.9rem;
  color: rgba(245, 240, 230, 0.68);
  line-height: 1.7;
  margin-bottom: 0.5rem;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  border-top: 1px solid rgba(245, 240, 230, 0.14);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(245, 240, 230, 0.45);
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal a {
  color: rgba(245, 240, 230, 0.55);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--golden);
}

.footer-copy {
  font-family: var(--font-mono);
}

.footer-icp {
  font-family: var(--font-mono);
}

/* ---------- 8. 通用按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.95rem 2rem;
  background: var(--vivid-orange);
  color: var(--warm-paper);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: var(--golden);
  transform: skewX(-30deg);
  transform-origin: left bottom;
}

.btn:hover,
.btn:focus-visible {
  background: #e55725;
  color: var(--warm-paper);
}

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

.btn--ghost {
  background: transparent;
  color: var(--space-blue);
  box-shadow: inset 0 0 0 2px var(--space-blue);
}

.btn--ghost::after {
  background: var(--vivid-orange);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(11, 27, 63, 0.06);
  color: var(--space-blue);
}

.btn--sm {
  padding: 0.6rem 1.25rem;
  font-size: 0.82rem;
}

/* ---------- 9. 章节与标题 ---------- */
.section {
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
}

.section-heading {
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
  position: relative;
}

.section-heading::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 28px;
  margin-right: 0.75rem;
  background: var(--vivid-orange);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 30% 100%, 0 100%);
  vertical-align: middle;
}

.section-heading span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--vivid-orange);
  letter-spacing: 0.08em;
  display: inline-block;
  vertical-align: middle;
  margin-left: 0.5rem;
}

/* ---------- 10. 内页首屏 ---------- */
.page-header {
  position: relative;
  padding-top: var(--space-5);
  padding-bottom: var(--space-4);
  overflow: hidden;
}

.page-title {
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 0.95;
  max-width: 16em;
}

.page-sub {
  font-size: 1.05rem;
  line-height: 1.7;
  color: rgba(10, 10, 10, 0.72);
  max-width: 40em;
  margin-top: var(--space-2);
}

.page-decor {
  position: absolute;
  top: 0.5rem;
  right: 2rem;
  font-family: var(--font-display);
  font-size: clamp(6rem, 16vw, 12rem);
  line-height: 1;
  color: rgba(11, 27, 63, 0.06);
  pointer-events: none;
  user-select: none;
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(10, 10, 10, 0.55);
}

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

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--vivid-orange);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: rgba(10, 10, 10, 0.35);
}

/* ---------- 12. 数据面板与统计卡 ---------- */
.data-panel {
  position: relative;
  background: var(--space-blue);
  color: var(--warm-paper);
  padding: var(--space-4);
  box-shadow: var(--shadow-deep);
}

.data-panel::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 48px;
  height: 48px;
  background: var(--vivid-orange);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.data-panel__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--golden);
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.stat-card {
  background: var(--mist);
  padding: var(--space-3);
  border-left: 3px solid var(--vivid-orange);
  box-shadow: var(--shadow-soft);
}

.stat-card__inner {
  background: var(--warm-paper);
  padding: var(--space-3);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: rgba(10, 10, 10, 0.58);
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--space-blue);
  line-height: 1.15;
}

.stat-value--orange {
  color: var(--vivid-orange);
}

.stat-delta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--success);
  margin-top: 0.25rem;
}

/* ---------- 13. 图片容器基类 ---------- */
.img-shell {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(rgba(11, 27, 63, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 27, 63, 0.05) 1px, transparent 1px),
    var(--mist);
  background-size: 24px 24px, 24px 24px, auto;
}

.img-shell::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 27, 63, 0.2) 0%, transparent 70%);
}

.img-shell--wide {
  aspect-ratio: 21 / 9;
}

.img-shell--tall {
  aspect-ratio: 4 / 5;
}

/* ---------- 14. 颜色实用类 ---------- */
.text-accent {
  color: var(--vivid-orange);
}

.text-muted {
  color: rgba(10, 10, 10, 0.6);
}

.bg-dark {
  background: var(--space-blue);
  color: var(--warm-paper);
}

.bg-mist {
  background: var(--mist);
}

/* ---------- 15. 响应式 ---------- */
@media (min-width: 48em) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 64em) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 48em) {
  :root {
    --gutter: 1rem;
    --space-5: 3.5rem;
    --space-6: 5rem;
  }

  .container,
  .header-top,
  .header-bottom,
  .footer-container {
    width: min(100% - var(--gutter) * 2, var(--container));
  }

  /* 头部移动端 */
  .header-top {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }

  .brand-tagline,
  .header-icp {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .header-bottom {
    width: 100%;
  }

  .site-nav {
    position: relative;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--space-blue);
    padding: 0.25rem var(--gutter) var(--space-2);
  }

  .site-nav[data-open] .nav-menu {
    display: flex;
    animation: navFadeIn 0.25s var(--ease);
  }

  @keyframes navFadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  .nav-link {
    padding: 0.9rem 0.25rem;
    border-bottom: 1px solid rgba(245, 240, 230, 0.12);
    width: 100%;
  }

  .nav-link::before {
    height: 2px;
  }

  .nav-link[aria-current="page"]::before {
    transform: skewX(-35deg) scaleX(1);
  }

  /* 页脚移动端 */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

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

  .footer-bottom {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }

  .footer-legal {
    justify-content: center;
  }

  /* 按钮移动端 */
  .btn {
    width: 100%;
    padding: 0.9rem 1.5rem;
  }
}

/* ---------- 16. 减弱动效 ---------- */
@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;
  }

  .scroll-progress {
    transition: none;
  }
}