/* ==========================================================================
   冠军赛场 · 共享样式表 /assets/site.css
   ========================================================================== */

:root {
  --c-gold: #D4AF37;
  --c-gold-dark: #8C7326;
  --c-red: #C8102E;
  --c-red-dark: #9C0C23;
  --c-green: #0B3D2E;
  --c-green-night: #072A20;
  --c-green-field: #145A44;
  --c-paper: #F7FAF8;
  --c-mist: #C9D8D0;
  --c-ink: #101915;
  --c-amber: #E0A526;

  --line-soft: rgba(201, 216, 208, 0.16);
  --line-mid: rgba(201, 216, 208, 0.34);
  --line-gold: rgba(212, 175, 55, 0.44);
  --line-ink: rgba(16, 25, 21, 0.14);

  --font-display: "Oswald", "Barlow Condensed", "Impact", "Haettenschweiler",
    "Arial Narrow", "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Consolas,
    "Liberation Mono", Menlo, monospace;

  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-16: 1rem;
  --fs-18: 1.125rem;
  --fs-24: 1.5rem;
  --fs-32: 2rem;
  --fs-48: 3rem;
  --fs-72: 4.5rem;
  --fs-96: 6rem;

  --gutter: clamp(16px, 4vw, 40px);
  --maxw: 1240px;
  --rail: 96px;
  --header-h: 76px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- Reset ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--c-green);
  background-image:
    linear-gradient(rgba(201, 216, 208, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 216, 208, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  color: var(--c-paper);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img {
  height: auto;
}

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: inherit;
}

p {
  margin: 0 0 16px;
}

p:last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: 0 0 16px;
  padding-left: 1.25em;
}

strong,
b {
  font-weight: 700;
}

hr {
  margin: 32px 0;
  border: 0;
  border-top: 1px solid var(--line-soft);
}

::selection {
  background: var(--c-gold);
  color: var(--c-ink);
}

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

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

/* ---------- 无障碍跳转 ---------- */

.skip-link {
  position: fixed;
  top: -200px;
  left: 16px;
  z-index: 400;
  padding: 12px 20px;
  background: var(--c-gold);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 12px;
  color: var(--c-ink);
}

/* ---------- 页面容器与网格 ---------- */

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: 840px;
}

.section {
  padding-block: clamp(48px, 6vw, 88px);
}

.grid {
  display: grid;
  gap: 24px;
}

.grid-12 {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.surface-paper {
  background: var(--c-paper);
  background-image: none;
  color: var(--c-ink);
}

.surface-paper a {
  color: var(--c-red);
}

.surface-paper a:hover {
  color: var(--c-red-dark);
}

/* ---------- 文本组件 ---------- */

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.eyebrow::before {
  content: "";
  flex: none;
  width: 22px;
  height: 2px;
  background: var(--c-red);
}

.section-title {
  position: relative;
  margin: 0 0 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
  font-size: clamp(1.75rem, 3.4vw, 3rem);
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 64px;
  height: 2px;
  background: var(--c-gold);
}

.lede {
  font-size: var(--fs-18);
  line-height: 1.8;
  color: var(--c-mist);
}

.surface-paper .lede {
  color: #3A4A43;
}

.surface-paper .section-title {
  border-bottom-color: var(--line-ink);
}

/* ---------- 编号标签 ---------- */

.num-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  padding: 1px 7px;
  background: var(--c-red);
  color: var(--c-paper);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
}

.num-tag--gold {
  background: var(--c-gold);
  color: var(--c-ink);
}

.num-tag--ghost {
  background: transparent;
  border: 1px solid var(--line-gold);
  color: var(--c-gold);
}

/* ---------- 面板 ---------- */

.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--c-green-night);
  border: 1px solid var(--line-soft);
}

.panel--gold {
  border-color: var(--line-gold);
}

.panel--field {
  background: var(--c-green-field);
}

.panel--paper {
  background: var(--c-paper);
  border-color: var(--line-ink);
  color: var(--c-ink);
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.btn--gold {
  background: var(--c-gold);
  border-color: var(--c-gold);
  color: var(--c-ink);
}

.btn--gold:hover {
  background: var(--c-gold-dark);
  border-color: var(--c-gold-dark);
  color: var(--c-paper);
}

.btn--red {
  background: var(--c-red);
  border-color: var(--c-red);
  color: var(--c-paper);
}

.btn--red:hover {
  background: var(--c-red-dark);
  border-color: var(--c-red-dark);
  color: var(--c-paper);
}

.btn--outline {
  background: transparent;
  border-color: var(--line-gold);
  color: var(--c-gold);
}

.btn--outline:hover {
  background: rgba(212, 175, 55, 0.12);
  border-color: var(--c-gold);
  color: var(--c-gold);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-mid);
  color: var(--c-paper);
}

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

/* ---------- 面包屑 ---------- */

.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-gold-dark);
}

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

.breadcrumb a:hover {
  color: var(--c-gold);
}

.breadcrumb [aria-current="page"] {
  color: var(--c-gold);
}

/* ---------- 图片容器 ---------- */

.figure {
  display: grid;
  gap: 10px;
  margin: 0;
}

.figure-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--c-green-field);
  background-image: linear-gradient(135deg, #124D3B 0%, #072A20 100%);
  border: 1px solid var(--line-soft);
}

.figure-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(to right, rgba(201, 216, 208, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 216, 208, 0.1) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.55;
  pointer-events: none;
}

.figure-frame img {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.figure-frame--tall {
  aspect-ratio: 3 / 4;
}

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

.figure-caption {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--c-mist);
}

.figure-caption::before {
  content: "№ ";
  color: var(--c-gold);
}

/* ---------- 通用标签 ---------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line-mid);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-green);
  color: var(--c-paper);
  border-bottom: 1px solid var(--line-soft);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(64px, 14vw, 180px);
  height: 2px;
  background: var(--c-gold);
}

.site-header[data-scrolled] {
  background: var(--c-green-night);
  box-shadow: 0 12px 34px -22px rgba(0, 0, 0, 0.95);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 200;
  pointer-events: none;
  background: transparent;
}

.scroll-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-red) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  max-width: var(--maxw);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.brand:hover {
  color: inherit;
}

.brand-emblem {
  display: grid;
  place-items: center;
  flex: none;
  width: 42px;
  height: 42px;
  background: var(--c-green-night);
  border: 1px solid var(--c-gold);
  box-shadow: inset 4px 4px 0 0 var(--c-red);
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1;
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 1px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.15;
  color: var(--c-paper);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--c-gold);
  white-space: nowrap;
}

.header-right {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
}

.primary-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  display: block;
}

.nav-link {
  position: relative;
  display: block;
  padding: 10px 2px;
  color: var(--c-mist);
  font-size: var(--fs-14);
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 1px;
  background: var(--c-gold);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.22s var(--ease);
}

.nav-link:hover {
  color: var(--c-gold);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--c-gold);
}

.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 14px;
  height: 2px;
  background: var(--c-red);
}

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

.header-cta {
  flex: none;
  padding: 10px 18px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid var(--line-gold);
  border-radius: 0;
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  cursor: pointer;
}

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

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

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

[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

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

[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-text {
  line-height: 1;
}

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  background: var(--c-green-night);
  color: var(--c-mist);
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-14);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--c-gold) 0%,
    var(--c-gold) 26%,
    var(--c-red) 26%,
    var(--c-red) 34%,
    transparent 34%
  );
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.85fr) minmax(0, 0.85fr) minmax(0, 1.25fr);
  gap: 40px 32px;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 56px var(--gutter) 40px;
}

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

.footer-brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 10px;
}

.footer-emblem {
  display: grid;
  place-items: center;
  flex: none;
  width: 34px;
  height: 34px;
  border: 1px solid var(--c-gold);
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  line-height: 1;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: var(--fs-18);
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-paper);
}

.footer-tagline {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--c-gold);
}

.footer-summary {
  max-width: 42ch;
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-mist);
}

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

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--c-gold);
}

.footer-col-title::before {
  content: "";
  flex: none;
  width: 12px;
  height: 2px;
  background: var(--c-red);
}

.footer-links {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: var(--c-mist);
  font-size: var(--fs-14);
  text-decoration: none;
  transition: color 0.16s var(--ease);
}

.footer-links a:hover {
  color: var(--c-gold);
}

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

.footer-contact-list {
  display: grid;
  gap: 8px;
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
}

.footer-contact-list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(212, 175, 55, 0.85);
}

.contact-value {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-paper);
  word-break: break-word;
}

.footer-note {
  margin: 0;
  padding-left: 10px;
  border-left: 2px solid var(--c-red);
  font-size: var(--fs-12);
  line-height: 1.75;
  color: rgba(201, 216, 208, 0.78);
}

.footer-base {
  border-top: 1px solid var(--line-soft);
}

.footer-base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 20px var(--gutter);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: rgba(201, 216, 208, 0.72);
}

.footer-legal,
.footer-copy {
  margin: 0;
}

.footer-base-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-base-links a {
  color: rgba(201, 216, 208, 0.72);
  text-decoration: none;
}

.footer-base-links a:hover {
  color: var(--c-gold);
}

/* ---------- 章节索引联动（页面可选协议） ---------- */

[data-scrollspy] a {
  transition: color 0.16s var(--ease);
}

[data-scrollspy] a.is-active {
  color: var(--c-gold);
}

/* ---------- 响应式 ---------- */

@media (max-width: 1120px) {
  .brand-sub {
    display: none;
  }
}

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr) minmax(0, 0.8fr);
  }
  .footer-contact {
    grid-column: 1 / -1;
  }
}

@media (max-width: 960px) {
  :root {
    --header-h: 66px;
  }

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

  .header-cta {
    display: none;
  }

  .header-right {
    gap: 0;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--header-h) - 3px);
    overflow-y: auto;
    padding: 8px var(--gutter) 22px;
    background: var(--c-green-night);
    border-top: 1px solid var(--line-soft);
    border-bottom: 1px solid var(--line-soft);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease),
      visibility 0.2s var(--ease);
  }

  .primary-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    padding: 14px 0;
    border-bottom: 1px solid var(--line-soft);
    font-size: var(--fs-16);
  }

  .nav-link::after {
    bottom: 0;
    right: auto;
    width: 40px;
  }

  .nav-link[aria-current="page"]::before {
    top: 50%;
    left: auto;
    right: 0;
    width: 18px;
    height: 2px;
    transform: translateY(-50%);
  }

  .grid-12 {
    grid-template-columns: minmax(0, 1fr);
  }

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8,
  .span-9,
  .span-12 {
    grid-column: span 1;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-top: 44px;
    gap: 32px 28px;
  }

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

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

@media (max-width: 600px) {
  .brand-name {
    font-size: 1.2rem;
  }

  .brand-emblem {
    width: 36px;
    height: 36px;
  }

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

  .footer-base-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .section {
    padding-block: 44px;
  }
}

/* ---------- 减少动态偏好 ---------- */

@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;
    scroll-behavior: auto !important;
  }
}