/* ==========================================================
   冠军竞界 · 全站共享样式
   路径：/assets/site.css
   ========================================================== */

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

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

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 18%, rgba(255, 107, 53, 0.06), transparent 32%),
    radial-gradient(circle at 88% 12%, rgba(255, 215, 0, 0.04), transparent 26%),
    var(--color-primary);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

ul, ol, menu {
  list-style: none;
}

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}

button {
  cursor: pointer;
}

table {
  border-collapse: collapse;
  width: 100%;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-heading);
  line-height: 1.25;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  text-wrap: balance;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

strong, b {
  font-weight: 600;
  color: var(--color-white);
}

code, kbd, samp {
  font-family: var(--font-data);
  font-size: 0.875em;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.125rem 0.375rem;
  border-radius: 2px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-white);
}

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

/* ---------- CSS Variables ---------- */
:root {
  --color-primary: #0B1E3A;
  --color-primary-deep: #071428;
  --color-primary-soft: #12294A;
  --color-card: #111827;
  --color-heading: #FFFFFF;
  --color-text: #E5E7EB;
  --color-text-muted: #9CA3AF;
  --color-accent: #FF6B35;
  --color-accent-soft: rgba(255, 107, 53, 0.16);
  --color-gold: #FFD700;
  --color-line: rgba(255, 255, 255, 0.10);

  --font-heading: Oswald, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: Inter, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-data: 'Roboto Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  --container: 1280px;
  --header-h: 72px;
  --radius: 2px;
  --radius-lg: 6px;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.30);

  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
}

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

.section {
  padding-block: var(--space-24);
}

.section--tight {
  padding-block: var(--space-12);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.main-content {
  min-height: 60vh;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 300;
  background: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  padding: 0.5rem 1rem;
  border-radius: 0 0 4px 4px;
  transition: top 0.25s ease;
}

.skip-link:focus-visible {
  top: 0;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 30, 58, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-line);
}

.site-header__gold-line {
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-gold) 55%, rgba(255, 215, 0, 0) 100%);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  height: var(--header-h);
}

.site-header__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-shrink: 0;
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-heading);
  white-space: nowrap;
  line-height: 1.2;
}

.site-header__brand-name::before {
  content: '▸ ';
  color: var(--color-accent);
}

.site-header__brand-sub {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  border-left: 1px solid var(--color-line);
  padding-left: 0.75rem;
  line-height: 1.5;
  white-space: nowrap;
}

.site-header__nav {
  margin-left: auto;
}

.site-header__list {
  display: flex;
  align-items: center;
  gap: 0.125rem;
}

.site-header__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  border: 1px solid transparent;
  border-radius: var(--radius);
  line-height: 1.4;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.site-header__link::before {
  content: attr(data-index);
  font-family: var(--font-data);
  font-size: 0.625rem;
  color: var(--color-gold);
  opacity: 0.8;
  line-height: 1;
}

.site-header__link:hover {
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-color: rgba(255, 107, 53, 0.25);
}

.site-header__link[aria-current="page"] {
  color: var(--color-white);
  background: var(--color-accent-soft);
  border-color: rgba(255, 107, 53, 0.45);
}

.site-header__link[aria-current="page"]::after {
  content: '';
  position: absolute;
  right: 0.75rem;
  left: 0.75rem;
  bottom: 0.25rem;
  height: 2px;
  background: var(--color-gold);
}

.site-header__toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.site-header__toggle:hover {
  border-color: rgba(255, 107, 53, 0.5);
  background: var(--color-accent-soft);
}

.site-header__toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-header__toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: translateY(12px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-12px) rotate(-45deg);
}

.site-header__toggle-label {
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 5;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  transform-origin: left center;
  transform: scaleX(0);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: var(--color-primary-deep);
  border-top: 1px solid var(--color-line);
  margin-top: var(--space-16);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  opacity: 0.5;
}

.site-footer__inner {
  padding-block: var(--space-16) var(--space-8);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--space-8);
}

.site-footer__col {
  min-width: 0;
}

.site-footer__brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: 0.06em;
}

.site-footer__brand-name::before {
  content: '▸ ';
  color: var(--color-accent);
}

.site-footer__brand-sub {
  font-family: var(--font-data);
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  margin-top: 0.25rem;
}

.site-footer__note {
  margin-top: 1.25rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 42ch;
}

.site-footer__trust {
  margin-top: 1rem;
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  border-left: 2px solid var(--color-gold);
  padding-left: 0.75rem;
  line-height: 1.6;
  max-width: 40ch;
}

.site-footer__heading {
  font-family: var(--font-data);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-white);
  padding-bottom: 0.625rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer__heading::before {
  content: '▸ ';
  color: var(--color-accent);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-footer__link {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding: 0.125rem 0;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__link:hover {
  color: var(--color-accent);
  padding-left: 0.5rem;
}

.site-footer__contact-line {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 0.375rem;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-block: 1.25rem;
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}

.site-footer__meta {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ---------- Back to Top ---------- */
.to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  background: rgba(7, 20, 40, 0.9);
  border: 1px solid rgba(255, 215, 0, 0.4);
  color: var(--color-text);
  font-family: var(--font-data);
  font-size: 0.75rem;
  border-radius: var(--radius);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: opacity 0.3s ease, transform 0.3s ease, border-color 0.2s ease, color 0.2s ease;
}

.to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.to-top:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.to-top__arrow {
  font-size: 1rem;
  line-height: 1;
  color: var(--color-gold);
}

.to-top__text {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  padding: 0.6875rem 1.375rem;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-white);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease, color 0.2s ease;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn--primary:hover {
  background: #ff5c20;
  transform: translateY(-1px);
}

.btn--ghost {
  border-color: rgba(255, 107, 53, 0.5);
  color: var(--color-accent);
  background: var(--color-accent-soft);
}

.btn--ghost:hover {
  background: rgba(255, 107, 53, 0.28);
  color: var(--color-white);
}

.btn--gold {
  border-color: rgba(255, 215, 0, 0.45);
  color: var(--color-gold);
  background: rgba(255, 215, 0, 0.12);
}

.btn--gold:hover {
  background: rgba(255, 215, 0, 0.2);
  color: var(--color-white);
}

/* ---------- Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.1875rem 0.625rem;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  white-space: nowrap;
}

.tag--orange {
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-color: rgba(255, 107, 53, 0.35);
}

.tag--gold {
  color: var(--color-gold);
  background: rgba(255, 215, 0, 0.08);
  border-color: rgba(255, 215, 0, 0.35);
}

/* ---------- Kicker ---------- */
.kicker {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.kicker::before {
  content: '';
  width: 28px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  flex-shrink: 0;
}

/* ---------- Section Head ---------- */
.section__head {
  margin-bottom: var(--space-8);
  max-width: 860px;
}

.section__title {
  font-size: clamp(1.75rem, 3.5vw, 2.625rem);
  margin-bottom: 0.5rem;
}

.section__desc {
  color: var(--color-text-muted);
  font-size: 1rem;
  max-width: 65ch;
}

/* ---------- Data Stat ---------- */
.data-stat {
  position: relative;
  padding: var(--space-6);
  background:
    linear-gradient(135deg, rgba(255, 107, 53, 0.12), rgba(11, 30, 58, 0) 65%),
    var(--color-card);
  border-left: 3px solid var(--color-gold);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.data-stat__value {
  font-family: var(--font-data);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.2;
}

.data-stat__label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 0.375rem;
  letter-spacing: 0.03em;
}

/* ---------- Panel ---------- */
.panel {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.panel--gradient {
  background:
    linear-gradient(135deg, rgba(255, 107, 53, 0.12), rgba(11, 30, 58, 0) 60%),
    var(--color-card);
}

.panel--slant {
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding: var(--space-4) 0;
}

.breadcrumb a {
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

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

.breadcrumb__sep {
  color: var(--color-gold);
  opacity: 0.5;
}

/* ---------- Content Prose ---------- */
.content {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text);
}

.content p {
  margin-bottom: var(--space-6);
}

.content h2,
.content h3 {
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}

.content ul,
.content ol {
  margin-bottom: var(--space-6);
  padding-left: 1.25rem;
}

.content ul {
  list-style: square;
}

.content ol {
  list-style: decimal;
}

.content li {
  margin-bottom: 0.375rem;
}

.content a {
  color: var(--color-accent);
  border-bottom: 1px solid rgba(255, 107, 53, 0.4);
  transition: border-color 0.2s ease;
}

.content a:hover {
  border-color: var(--color-accent);
}

.content blockquote {
  border-left: 3px solid var(--color-gold);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
  color: var(--color-text-muted);
}

.content blockquote p:last-child {
  margin-bottom: 0;
}

/* ---------- Divider ---------- */
.divider {
  height: 1px;
  border: none;
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.5), rgba(255, 215, 0, 0.3), transparent);
  margin: var(--space-12) 0;
}

/* ---------- Figure / Placeholder ---------- */
.figure {
  position: relative;
  overflow: hidden;
  background: var(--color-primary-soft);
  border: 1px solid var(--color-line);
  aspect-ratio: 16 / 9;
}

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

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

.figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.figure__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 0.25rem 0.625rem;
  background: rgba(7, 20, 40, 0.82);
  color: var(--color-gold);
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
}

.ph {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  padding: var(--space-6);
  background: var(--color-primary-soft);
  border: 1px dashed rgba(255, 255, 255, 0.18);
  color: var(--color-text-muted);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-align: center;
}

/* ---------- Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}

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

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    top: calc(var(--header-h) + 3px);
    left: 0;
    right: 0;
    margin-left: 0;
    background: rgba(7, 20, 40, 0.98);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .site-header__nav[data-open="true"] {
    max-height: 480px;
  }

  .site-header__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem;
  }

  .site-header__link {
    width: 100%;
    justify-content: flex-start;
    padding: 0.875rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 0;
    font-size: 0.9375rem;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12) var(--space-8);
  }

  .grid--cols-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--cols-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  :root {
    --header-h: 64px;
  }

  .site-header__brand-sub {
    display: none;
  }

  .site-header__brand-name {
    font-size: 1.25rem;
  }

  .site-header__nav {
    top: calc(var(--header-h) + 3px);
  }

  .grid--cols-2,
  .grid--cols-3,
  .grid--cols-4 {
    grid-template-columns: 1fr;
  }

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

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .section {
    padding-block: var(--space-12);
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }

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