:root {
  --fox-orange: #FF6A00;
  --deep-black: #1A1A1A;
  --flame-red: #E63946;
  --esports-blue: #00B4D8;
  --cream: #F5F0E8;
  --deep-brown-black: #0D0D0D;
  --iron-gray: #2A2A2A;
  --moon-white: #F8F9FA;
  --orange-light: #FFB380;
  --blue-black: #001F2E;

  --font-display: Impact, "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Open Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --content-max: 1200px;
  --gutter: 24px;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.14);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--deep-black);
  background-color: var(--cream);
  -webkit-font-smoothing: antialiased;
}

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

input,
button,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

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

ul,
ol {
  list-style: none;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  font-weight: 400;
  color: var(--deep-black);
}

p {
  margin: 0 0 1em;
}

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

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 9999;
  padding: 10px 20px;
  background: var(--deep-black);
  color: var(--moon-white);
  font-weight: 700;
  font-size: 14px;
  border-radius: 0 0 8px 8px;
  transition: top 0.2s ease;
}

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

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

main:focus {
  outline: none;
}

#main-content {
  scroll-margin-top: 150px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(245, 240, 232, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--iron-gray);
  transition: background-color 0.3s, box-shadow 0.3s;
}

.site-header[data-scrolled="true"] {
  background-color: rgba(245, 240, 232, 0.98);
  box-shadow: var(--shadow-md);
}

.header-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  padding-top: 14px;
  padding-bottom: 0;
  text-align: center;
  transition: padding-top 0.3s;
}

.site-header[data-scrolled="true"] .header-inner {
  padding-top: 8px;
}

.masthead {
  grid-column: 2;
  grid-row: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  vertical-align: top;
}

.brand-logomark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--fox-orange);
  color: var(--deep-black);
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1;
  border-radius: 12px;
  border: 2px solid var(--deep-black);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.18);
  flex-shrink: 0;
  transition: transform 0.3s var(--ease);
}

.brand:hover .brand-logomark,
.brand:focus-visible .brand-logomark {
  transform: rotate(-6deg) scale(1.04);
}

.brand-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 30px;
  letter-spacing: 0.04em;
  color: var(--deep-black);
  line-height: 1;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--iron-gray);
  letter-spacing: 0.18em;
  margin-top: 4px;
}

.masthead-slogan {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--flame-red);
  background: rgba(230, 57, 70, 0.06);
  border: 1px dashed rgba(230, 57, 70, 0.5);
  padding: 4px 14px;
  border-radius: 20px;
  display: inline-block;
  white-space: nowrap;
}

.primary-nav {
  grid-column: 1 / -1;
  grid-row: 2;
  margin-top: 12px;
  transition: margin-top 0.3s;
}

.site-header[data-scrolled="true"] .primary-nav {
  margin-top: 6px;
}

.nav-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 12px 14px 10px;
  font-weight: 700;
  font-size: 15px;
  color: var(--deep-black);
  border-bottom: 3px solid transparent;
  transition: color 0.2s, border-color 0.2s, background-color 0.2s;
}

.nav-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--fox-orange);
  transition: color 0.2s;
}

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

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
  color: var(--fox-orange);
  border-bottom-color: var(--fox-orange);
}

.nav-toggle {
  grid-column: 3;
  grid-row: 1;
  justify-self: end;
  align-self: center;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  border-radius: 8px;
  border: 2px solid var(--deep-black);
  background: var(--cream);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.15);
  transition: background-color 0.2s, box-shadow 0.2s;
  padding: 0;
}

.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  background: var(--orange-light);
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 3px;
  background: var(--deep-black);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 3px;
  width: 0;
  z-index: 10;
  background: linear-gradient(90deg, var(--fox-orange), var(--flame-red), var(--esports-blue));
  pointer-events: none;
}

.site-footer {
  position: relative;
  background-color: var(--deep-brown-black);
  color: var(--moon-white);
  font-family: var(--font-body);
  padding: 64px 0 28px;
  margin-top: 80px;
  border-top: none;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: repeating-linear-gradient(
    90deg,
    var(--fox-orange) 0,
    var(--fox-orange) 60px,
    var(--flame-red) 60px,
    var(--flame-red) 120px,
    var(--deep-black) 120px,
    var(--deep-black) 150px,
    var(--esports-blue) 150px,
    var(--esports-blue) 190px
  );
  opacity: 0.9;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.2fr;
  gap: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1;
  color: var(--moon-white);
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.footer-logo-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fox-orange);
  background: rgba(255, 106, 0, 0.15);
  border: 1px solid rgba(255, 106, 0, 0.4);
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.08em;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--orange-light);
  letter-spacing: 0.06em;
}

.footer-trust {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(248, 249, 250, 0.7);
  border-left: 3px solid var(--fox-orange);
  padding-left: 12px;
  max-width: 42em;
}

.footer-heading {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fox-orange);
  border-bottom: 1px solid var(--iron-gray);
  padding-bottom: 8px;
  margin-bottom: 14px;
}

.footer-links ul,
.footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  display: inline-block;
  color: var(--moon-white);
  opacity: 0.85;
  font-size: 15px;
  transition: opacity 0.2s, color 0.2s, padding-left 0.2s;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  opacity: 1;
  color: var(--fox-orange);
  padding-left: 4px;
}

.footer-contact {
  font-size: 14px;
  color: rgba(248, 249, 250, 0.8);
  line-height: 1.8;
}

.footer-contact li {
  margin-bottom: 4px;
}

.footer-meta {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--iron-gray);
  padding-top: 20px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(248, 249, 250, 0.5);
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--fox-orange);
  color: var(--deep-black);
  border: 2px solid var(--deep-black);
  border-radius: 50%;
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.25);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.3s, transform 0.3s, visibility 0.3s, background-color 0.2s;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: var(--flame-red);
  color: var(--moon-white);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.12);
}

.back-to-top-icon {
  display: inline-block;
  font-size: 24px;
  line-height: 1;
  transform: translateY(-1px);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--deep-black);
  color: var(--moon-white);
  border: 2px solid var(--deep-black);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.2;
  text-align: center;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.btn:hover,
.btn:focus-visible {
  background: var(--fox-orange);
  border-color: var(--fox-orange);
  color: var(--deep-black);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(255, 106, 0, 0.25);
}

.btn--primary {
  background: var(--fox-orange);
  border-color: var(--fox-orange);
  color: var(--deep-black);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--deep-black);
  border-color: var(--deep-black);
  color: var(--moon-white);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

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

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--fox-orange);
  border-color: var(--fox-orange);
  color: var(--deep-black);
  box-shadow: none;
  transform: translateY(-1px);
}

.btn--sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn--lg {
  padding: 14px 32px;
  font-size: 16px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--deep-black);
  background: var(--fox-orange);
  border-radius: 3px;
  line-height: 1.5;
  white-space: nowrap;
}

.tag--blue {
  background: var(--esports-blue);
  color: var(--moon-white);
}

.tag--red {
  background: var(--flame-red);
  color: var(--moon-white);
}

.tag--dark {
  background: var(--deep-black);
  color: var(--moon-white);
}

.tag--outline {
  background: transparent;
  border: 1px solid var(--fox-orange);
  color: var(--fox-orange);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 20px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--iron-gray);
}

.breadcrumb a {
  color: var(--fox-orange);
  font-weight: 600;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--flame-red);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.breadcrumb-sep {
  color: var(--iron-gray);
}

.breadcrumb [aria-current="page"] {
  color: var(--deep-black);
  font-weight: 700;
}

.section-title {
  font-family: var(--font-display);
  font-size: 40px;
  line-height: 1.15;
  letter-spacing: 0.02em;
  margin: 0 0 20px;
  padding: 8px 0 8px 16px;
  position: relative;
  color: var(--deep-black);
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 5px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--fox-orange), var(--flame-red));
}

.section-title--center {
  text-align: center;
  padding-left: 0;
}

.section-title--center::before {
  display: none;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.data-card {
  background: var(--cream);
  border: 1px solid var(--iron-gray);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s;
}

.data-card:hover,
.data-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--fox-orange);
  box-shadow: var(--shadow-md);
}

.data-card__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fox-orange);
  margin-bottom: 12px;
  letter-spacing: 0.08em;
}

.data-card__title {
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.25;
  margin-bottom: 8px;
}

.data-card__desc {
  font-size: 14px;
  color: var(--iron-gray);
  line-height: 1.6;
}

.data-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-weight: 700;
  font-size: 14px;
  color: var(--fox-orange);
  transition: gap 0.2s;
}

.data-card__link:hover,
.data-card__link:focus-visible {
  gap: 10px;
}

.data-card--dark {
  background: var(--blue-black);
  border-color: var(--blue-black);
  color: var(--moon-white);
}

.data-card--dark .data-card__title {
  color: var(--moon-white);
}

.data-card--dark .data-card__desc {
  color: rgba(255, 255, 255, 0.65);
}

.data-card--dark .data-card__idx {
  color: var(--esports-blue);
}

.img-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 9;
  background-color: var(--blue-black);
  display: block;
}

.img-frame::before {
  content: "IMAGE";
  position: absolute;
  inset: 0;
  z-index: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.35em;
  text-indent: 0.35em;
  color: rgba(255, 255, 255, 0.55);
  background:
    repeating-linear-gradient(
      -45deg,
      transparent 0,
      transparent 12px,
      rgba(255, 255, 255, 0.04) 12px,
      rgba(255, 255, 255, 0.04) 24px
    ),
    linear-gradient(135deg, var(--blue-black), var(--deep-black));
}

.img-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.img-frame--portrait {
  aspect-ratio: 4 / 5;
}

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

@media (max-width: 880px) {
  #main-content {
    scroll-margin-top: 110px;
  }

  .header-inner {
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .masthead-slogan {
    display: none;
  }

  .brand-logomark {
    width: 38px;
    height: 38px;
    font-size: 20px;
    border-radius: 10px;
  }

  .brand-name {
    font-size: 22px;
  }

  .brand-sub {
    font-size: 9px;
    letter-spacing: 0.12em;
  }

  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    display: none;
    margin-top: 8px;
    border-top: 2px solid var(--deep-black);
  }

  .primary-nav[data-open="true"] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 4px 0 8px;
  }

  .nav-item {
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-link {
    display: flex;
    width: 100%;
    padding: 13px 12px;
    border-bottom: none;
    font-size: 15px;
  }

  .nav-link:hover,
  .nav-link:focus-visible,
  .nav-link[aria-current="page"] {
    background: rgba(255, 106, 0, 0.08);
    border-bottom: none;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-meta {
    grid-column: 1;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 6px;
  }

  .back-to-top {
    right: 14px;
    bottom: 14px;
    width: 42px;
    height: 42px;
  }

  .section-title {
    font-size: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}