:root {
  --color-primary: #0A2B4A;
  --color-primary-2: #1B3A5C;
  --color-white: #FFFFFF;
  --color-accent: #FF6A00;
  --color-gold: #D4AF37;
  --color-bg-light: #F0F4F8;
  --color-text-sub: #1B3A5C;
  --color-border: #D0D9DF;
  --color-success: #2E7D32;
  --color-danger: #C62828;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-display: "Noto Sans SC Black", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", ui-monospace, Consolas, "Liberation Mono", monospace;
  --max-width: 1440px;
  --header-height: 72px;
}

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

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

body {
  margin: 0;
  padding-top: var(--header-height);
  background: var(--color-white);
  color: var(--color-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
}

body.is-nav-open {
  overflow: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.75em;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  color: var(--color-primary);
}

p {
  margin: 0 0 1rem;
}

ul, ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

a {
  color: var(--color-accent);
}

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

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 1rem;
  z-index: 200;
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.3s ease;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.12), 0 10px 30px rgba(10, 43, 74, 0.18);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 14px);
}

.site-header__progress {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 3;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  box-shadow: 0 0 12px rgba(255, 106, 0, 0.35);
}

.site-header__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--header-height);
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.site-header__brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-white);
  text-decoration: none;
}

.site-header__brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--color-accent), var(--color-gold));
  clip-path: polygon(0 0, 88% 0, 100% 100%, 12% 100%);
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 900;
}

.site-header__brand-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  clip-path: inherit;
}

.site-header__brand-text {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.2;
  white-space: nowrap;
}

.site-header__brand-divider {
  margin-inline: 0.1em;
  color: var(--color-gold);
  font-weight: 300;
}

.site-header__brand-text strong {
  color: var(--color-accent);
  font-weight: 900;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.site-header__menu {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__item {
  margin: 0;
}

.site-header__link {
  position: relative;
  display: block;
  padding: 0.5rem 0;
  color: rgba(255, 255, 255, 0.82);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.3s ease;
}

.site-header__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.site-header__link:hover {
  color: var(--color-white);
}

.site-header__link[aria-current="page"] {
  color: var(--color-accent);
}

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

.site-header__account {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.55rem 1.2rem;
  background: var(--color-accent);
  border: 1px solid rgba(255, 255, 255, 0.18);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.site-header__account:hover {
  background: var(--color-gold);
  border-color: rgba(255, 255, 255, 0.4);
}

.site-header__account-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.2);
}

.site-header__toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.25rem 0.5rem;
  border: 0;
  background: transparent;
  color: var(--color-white);
  cursor: pointer;
}

.site-header__toggle-bar {
  display: block;
  width: 1.375rem;
  height: 2px;
  margin: 2px 0;
  background: currentColor;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

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

.site-header__toggle-label {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.76);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 24px 24px;
}

.site-footer::after {
  content: "竞界";
  position: absolute;
  right: -0.02em;
  bottom: -0.34em;
  color: rgba(255, 255, 255, 0.035);
  font-family: var(--font-display);
  font-size: clamp(8rem, 24vw, 20rem);
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 3rem 1.5rem 1.75rem;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.2fr 1.5fr 1fr;
  gap: 2.5rem;
  align-items: start;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

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

.site-footer__brand-name {
  margin: 0;
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.site-footer__tagline {
  max-width: 30rem;
  margin: 0.5rem 0 0;
  padding-left: 0.75rem;
  border-left: 3px solid var(--color-accent);
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.site-footer__nav {
  display: grid;
}

.site-footer__menu {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.625rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__menu li {
  margin: 0;
}

.site-footer__link {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.3s ease;
}

.site-footer__link:hover {
  color: var(--color-accent);
}

.site-footer__link[aria-current="page"] {
  color: var(--color-gold);
  pointer-events: none;
}

.site-footer__contact {
  font-style: normal;
}

.site-footer__contact-label {
  margin: 0 0 0.75rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--color-gold);
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.site-footer__contact-item {
  margin: 0.375rem 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  line-height: 1.5;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  padding-top: 1.25rem;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8125rem;
}

.site-footer__meta {
  margin: 0;
}

.site-footer__note {
  flex-basis: 100%;
  margin: 0.25rem 0 0;
  padding-left: 0.75rem;
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.8125rem;
}

.main-content {
  display: block;
  min-height: 70vh;
}

.container {
  width: min(100% - clamp(1.5rem, 6vw, 4rem), calc(var(--max-width) - 3rem));
  margin-inline: auto;
}

.page-container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: clamp(2rem, 6vw, 5rem) 1.5rem clamp(3rem, 8vw, 6rem);
}

.section {
  padding-block: clamp(3.5rem, 8vw, 7rem);
}

.section--tinted {
  background: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section__header {
  max-width: 46rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.section__index {
  margin: 0 0 0.5rem;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.section__title {
  margin: 0 0 0.75rem;
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.08;
}

.section__desc {
  max-width: 48rem;
  margin: 0;
  color: var(--color-text-sub);
  font-size: 1.0625rem;
  line-height: 1.75;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  background: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.btn:hover {
  background: var(--color-gold);
  border-color: rgba(10, 43, 74, 0.12);
  color: var(--color-primary);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-primary);
}

.btn--ghost:hover {
  background: var(--color-bg-light);
  border-color: var(--color-border);
  color: var(--color-primary);
}

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

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

.breadcrumb {
  margin: 0;
  padding: 1rem 0 0;
  font-size: 0.875rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--color-border);
  font-weight: 300;
}

.breadcrumb__link {
  color: var(--color-text-sub);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.breadcrumb__current {
  color: var(--color-primary);
  font-weight: 800;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1rem, 2.5vw, 2rem);
}

.col-span-4,
.col-span-6,
.col-span-8,
.col-span-12 {
  grid-column: span 12;
  min-width: 0;
}

.card {
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--color-white);
  border: 1px solid var(--color-border);
}

.card--tinted {
  background: var(--color-bg-light);
  border-color: transparent;
}

.media-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary-2), var(--color-primary));
  border: 1px solid var(--color-border);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.06) 0 10px, transparent 10px 20px);
}

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

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

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  padding: 1rem;
  color: rgba(255, 255, 255, 0.82);
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-align: center;
}

.media-frame__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 899px) {
  :root {
    --header-height: 64px;
  }

  .site-header__inner {
    padding-inline: 1rem;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
    max-height: 0;
    overflow: hidden;
    padding: 0 1rem;
    background: rgba(10, 43, 74, 0.96);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: max-height 0.3s ease, opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, padding 0.3s ease;
  }

  .site-header__nav[data-open] {
    max-height: calc(100vh - var(--header-height));
    padding: 1.25rem 1.5rem 1.75rem;
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .site-header__menu {
    flex-direction: column;
    align-items: stretch;
    gap: 0.125rem;
  }

  .site-header__link {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 1rem;
  }

  .site-header__account {
    justify-content: center;
    margin-top: 1rem;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .site-footer__note {
    flex-basis: auto;
  }
}

@media (min-width: 720px) {
  .col-span-4 {
    grid-column: span 6;
  }

  .col-span-6 {
    grid-column: span 6;
  }

  .col-span-8 {
    grid-column: span 8;
  }

  .col-span-12 {
    grid-column: span 12;
  }
}

@media (min-width: 1080px) {
  .col-span-4 {
    grid-column: span 4;
  }

  .col-span-6 {
    grid-column: span 6;
  }

  .col-span-8 {
    grid-column: span 8;
  }

  .col-span-12 {
    grid-column: span 12;
  }
}

@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;
  }

  .site-header__nav {
    transition: none;
  }
}