:root {
  /* Design DNA: Esports Tech Arena | Obsidian Black Base + Neon Lime Accent + Silver Highlights | Arena Header + Bracket Grid Sections | Header → Hero → Esports Programs → Events/Bracket → Services → About → Contact/Location → Business Info → Footer | Sharp Tech Icon | Subtle Hex Mesh */
  --color-obsidian: #0b0d10;
  --color-void: #060708;
  --color-silver: #c3c7cf;
  --color-silver-dim: #8b909a;
  --color-lime: #b7ff2f;
  --color-lime-dim: #88c71b;
  --color-white: #f2f5f8;
  --color-line: #1d2128;
  --shadow-glow: 0 0 20px rgba(183, 255, 47, 0.2);
  --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.35);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --font-sans: "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", Arial, sans-serif;
  --grid-max: 1200px;
  --section-pad: 80px;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  background: radial-gradient(circle at top, #141820 0%, var(--color-void) 40%, #050607 100%);
  color: var(--color-white);
  line-height: 1.6;
}

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

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 12px;
  background: var(--color-lime);
  color: #000;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  z-index: 999;
}

.skip-link:focus {
  left: 12px;
}

.container {
  width: min(100% - 32px, var(--grid-max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 7, 8, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-logo {
  width: 40px;
  height: 40px;
}

.brand-name {
  font-size: 1.1rem;
}

.primary-nav {
  display: flex;
  gap: 20px;
  align-items: center;
  font-size: 0.95rem;
}

.primary-nav a {
  color: var(--color-silver);
  transition: color 0.2s ease;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--color-lime);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-line);
  padding: 8px;
  border-radius: var(--radius-sm);
  color: var(--color-white);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  margin: 5px 0;
}

.hero {
  position: relative;
  padding: 120px 0 90px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='140' viewBox='0 0 160 140'%3E%3Cg fill='none' stroke='%2320262f' stroke-width='1'%3E%3Cpath d='M40 10l20 12v24l-20 12-20-12V22z'/%3E%3Cpath d='M100 10l20 12v24l-20 12-20-12V22z'/%3E%3Cpath d='M70 70l20 12v24l-20 12-20-12V82z'/%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
  gap: 40px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-lime);
  font-size: 0.8rem;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(2.2rem, 3vw, 3.3rem);
  margin: 0 0 12px;
}

.hero-desc {
  color: var(--color-silver);
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: var(--color-lime);
  color: #0b0d10;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
}

.btn-ghost {
  border-color: var(--color-silver-dim);
  color: var(--color-silver);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--color-lime);
  color: var(--color-lime);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--color-silver);
}

.hero-visual img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-card);
}

.section {
  padding: var(--section-pad) 0;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 2.5vw, 2.5rem);
  margin: 0;
}

.section-header p {
  color: var(--color-silver);
  margin: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: linear-gradient(160deg, rgba(16, 19, 24, 0.9), rgba(9, 11, 14, 0.95));
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--color-lime-dim);
}

.card h3 {
  margin-top: 10px;
  margin-bottom: 8px;
}

.card p {
  color: var(--color-silver);
  margin: 0 0 12px;
}

.card-icon svg {
  width: 40px;
  height: 40px;
  stroke: var(--color-lime);
  fill: none;
  stroke-width: 2;
}

.text-button {
  background: transparent;
  border: none;
  color: var(--color-lime);
  padding: 0;
  font-weight: 600;
  cursor: pointer;
}

.card-detail {
  margin-top: 10px;
  color: var(--color-silver);
}

.bracket {
  background: linear-gradient(180deg, rgba(7, 9, 12, 0.6), rgba(12, 15, 20, 0.9));
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.bracket-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.chip-button {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-silver);
  cursor: pointer;
}

.chip-button[aria-expanded="false"] {
  opacity: 0.5;
}

.bracket-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.bracket-column {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px;
  background: rgba(9, 11, 14, 0.85);
}

.bracket-column h3 {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0;
}

.label {
  font-size: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-lime);
}

.match {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 8px;
  padding: 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-line);
  margin-bottom: 10px;
  color: var(--color-silver);
}

.match.highlight {
  border-color: var(--color-lime);
  box-shadow: var(--shadow-glow);
}

.bracket-column.is-collapsed {
  display: none;
}

.services-grid .card {
  border-left: 2px solid var(--color-lime-dim);
}

.about {
  background: radial-gradient(circle at right, rgba(183, 255, 47, 0.08), transparent 60%);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.about-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
}

.about-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-silver);
}

.about-panel {
  background: rgba(12, 15, 20, 0.85);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-line);
  padding: 20px;
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.contact-box {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  background: rgba(9, 11, 14, 0.85);
}

.address {
  font-weight: 600;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.contact-form {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  background: rgba(9, 11, 14, 0.9);
  display: grid;
  gap: 14px;
}

.contact-form label {
  display: grid;
  gap: 6px;
  color: var(--color-silver);
}

.contact-form input,
.contact-form textarea {
  background: #0d1014;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--color-white);
}

.contact-form input:focus-visible,
.contact-form textarea:focus-visible,
.text-button:focus-visible,
.chip-button:focus-visible,
.nav-toggle:focus-visible,
.btn:focus-visible,
.primary-nav a:focus-visible {
  outline: 2px solid var(--color-lime);
  outline-offset: 2px;
}

.form-note {
  color: var(--color-silver);
  min-height: 22px;
}

.muted {
  color: var(--color-silver-dim);
}

.business {
  border-top: 1px solid var(--color-line);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  background: rgba(8, 10, 13, 0.75);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
}

.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-line);
  background: #07090c;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.to-top {
  color: var(--color-lime);
}

@media (max-width: 900px) {
  .primary-nav {
    position: absolute;
    right: 16px;
    top: 70px;
    flex-direction: column;
    background: rgba(7, 9, 12, 0.98);
    border: 1px solid var(--color-line);
    padding: 16px;
    border-radius: var(--radius-md);
    display: none;
  }

  .site-header.nav-open .primary-nav {
    display: flex;
  }

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

  .hero {
    padding-top: 100px;
  }
}

@media (max-width: 600px) {
  :root {
    --section-pad: 64px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}