:root {
      --black: #000000;
      --card-bg: #0a0a0a;
      --border-dark: #262626;
      --light-gray: #888888;
      --white: #ffffff;
    }

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

    body {
      background-color: var(--black);
      color: var(--white);
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    /* NAV */
    nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.5rem 10%;
      border-bottom: 1px solid var(--border-dark);
      background: rgba(0, 0, 0, 0.95);
      position: sticky;
      top: 0;
      z-index: 100;
      backdrop-filter: blur(10px);
    }

    .logo {
      font-size: 1.1rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      flex-wrap: wrap;
    }

    .logo a {
      color: var(--white);
      text-decoration: none;
    }

    .logo-crumb {
      color: #666;
      text-decoration: none;
      font-weight: 700;
      transition: color 0.2s ease;
    }

    .logo-crumb:hover {
      color: var(--white);
    }

    .logo-badge {
      color: #aaa;
      font-weight: 800;
      font-size: 0.8rem;
      background: #141414;
      border: 1px solid #333;
      padding: 0.2rem 0.6rem;
      letter-spacing: 1px;
    }

    .nav-links {
      display: flex;
      gap: 1.75rem;
      align-items: center;
    }

    .nav-links a {
      color: var(--light-gray);
      text-decoration: none;
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      transition: all 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--white);
    }

    /* HERO */
    .city-hero {
      min-height: 80vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 6rem 10%;
      background: var(--black);
      position: relative;
      border-bottom: 1px solid var(--border-dark);
    }

    .city-hero::before {
      content: "";
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background-image:
        linear-gradient(#222 1px, transparent 1px),
        linear-gradient(90deg, #222 1px, transparent 1px);
      background-size: 80px 80px;
      opacity: 0.25;
      z-index: 0;
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 1;
      max-width: 1100px;
    }

    .badge-protocol {
      display: inline-flex;
      align-items: center;
      gap: 0.75rem;
      border: 1px solid #444;
      background: #111;
      padding: 0.4rem 1rem;
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      margin-bottom: 1.5rem;
      color: #e5e5e5;
    }

    .badge-protocol .dot {
      width: 8px;
      height: 8px;
      background: #00ff66;
      border-radius: 50%;
      box-shadow: 0 0 10px #00ff66;
    }

    .event-meta-banner {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      margin-bottom: 1.5rem;
      font-size: 0.9rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #888;
      flex-wrap: wrap;
    }

    .event-meta-banner .city-name {
      color: var(--white);
      font-size: 1.1rem;
    }

    .city-hero h1 {
      font-size: clamp(2.5rem, 5.5vw, 4.8rem);
      font-weight: 900;
      line-height: 1.08;
      letter-spacing: -2px;
      text-transform: uppercase;
      color: var(--white);
      margin-bottom: 2rem;
    }

    .city-hero p.hero-desc {
      font-size: clamp(1.1rem, 1.8vw, 1.3rem);
      color: var(--light-gray);
      max-width: 850px;
      line-height: 1.65;
      margin-bottom: 2.5rem;
    }

    .btn-container {
      display: flex;
      gap: 1.25rem;
      flex-wrap: wrap;
      align-items: center;
    }

    .btn-primary {
      background: var(--white);
      color: var(--black);
      padding: 1rem 2.25rem;
      text-decoration: none;
      font-weight: 800;
      text-transform: uppercase;
      font-size: 0.85rem;
      letter-spacing: 1px;
      border: 2px solid var(--white);
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--black);
      color: var(--white);
      transform: translateY(-2px);
    }

    .btn-platform {
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      background: #111;
      border: 1px solid #444;
      color: var(--white);
      padding: 1rem 1.75rem;
      text-decoration: none;
      font-size: 0.85rem;
      font-weight: 800;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      transition: all 0.2s ease;
    }

    .btn-platform:hover {
      background: var(--white);
      color: var(--black);
      border-color: var(--white);
      transform: translateY(-2px);
    }

    .btn-platform svg {
      width: 16px;
      height: 16px;
      fill: currentColor;
    }

    .hero-seat-bar {
      margin-top: 2.5rem;
      padding-top: 1.5rem;
      border-top: 1px solid #222;
      display: flex;
      align-items: center;
      gap: 1.5rem;
      flex-wrap: wrap;
    }

    .seat-status-pill {
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: #00ff66;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .meta-tags-row {
      display: flex;
      gap: 0.6rem;
      flex-wrap: wrap;
    }

    .meta-tag {
      background: #141414;
      border: 1px solid #333;
      padding: 0.25rem 0.75rem;
      font-size: 0.72rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #ccc;
    }

    /* SECTIONS */
    .section {
      padding: 6rem 10%;
      border-bottom: 1px solid var(--border-dark);
      background: var(--black);
    }

    .section-alt {
      background: #060606;
    }

    .section-tag {
      font-size: 0.8rem;
      font-weight: 800;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: #888;
      margin-bottom: 1rem;
    }

    .section-title {
      font-size: clamp(2rem, 3.8vw, 3.2rem);
      font-weight: 900;
      letter-spacing: -1.5px;
      text-transform: uppercase;
      margin-bottom: 3.5rem;
      color: var(--white);
    }

    /* OVERVIEW */
    .overview-box {
      border: 1px solid var(--border-dark);
      background: var(--card-bg);
      padding: 3.5rem;
      max-width: 1000px;
    }

    .overview-box h3 {
      font-size: 1.5rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      margin-bottom: 1.5rem;
      color: var(--white);
    }

    .overview-box p {
      font-size: 1.05rem;
      color: #aaa;
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }

    .overview-box p:last-child {
      margin-bottom: 0;
    }

    /* SESSIONS GRID */
    .sessions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .session-card {
      border: 1px solid var(--border-dark);
      background: var(--card-bg);
      padding: 2.75rem 2.25rem;
      transition: border-color 0.2s ease;
    }

    .session-card:hover {
      border-color: #555;
    }

    .session-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.5rem;
    }

    .session-num {
      font-size: 1.8rem;
      font-weight: 900;
      color: #333;
      letter-spacing: -1px;
    }

    .session-pill {
      font-size: 0.7rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #888;
      background: #111;
      border: 1px solid #333;
      padding: 0.25rem 0.6rem;
    }

    .session-card h3 {
      font-size: 1.2rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      color: var(--white);
      margin-bottom: 1rem;
      line-height: 1.35;
    }

    .session-card p {
      font-size: 0.92rem;
      color: #999;
      line-height: 1.6;
    }

    /* VENUE & PROTOCOLS */
    .venue-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }

    .venue-card {
      border: 1px solid var(--border-dark);
      background: var(--card-bg);
      padding: 3rem;
    }

    .venue-card h3 {
      font-size: 1.35rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      color: var(--white);
      margin-bottom: 1.25rem;
    }

    .venue-card p {
      font-size: 0.95rem;
      color: #aaa;
      line-height: 1.65;
      margin-bottom: 1rem;
    }

    .venue-detail-item {
      display: flex;
      align-items: flex-start;
      gap: 1rem;
      margin-top: 1.25rem;
      padding-top: 1.25rem;
      border-top: 1px solid #222;
    }

    .venue-detail-label {
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: #777;
      min-width: 120px;
    }

    .venue-detail-val {
      font-size: 0.9rem;
      color: var(--white);
      font-weight: 600;
    }

    /* PLATFORMS INTEGRATION */
    .platforms-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }

    .platform-card {
      border: 1px solid var(--border-dark);
      background: var(--card-bg);
      padding: 3rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .platform-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.5rem;
    }

    .platform-card-brand {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }

    .platform-card-brand svg {
      width: 24px;
      height: 24px;
      fill: var(--white);
    }

    .platform-card-brand h3 {
      font-size: 1.35rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      color: var(--white);
    }

    .platform-card p {
      font-size: 0.92rem;
      color: #aaa;
      line-height: 1.65;
      margin-bottom: 2rem;
    }

    /* APPLICATION FORM */
    .invite-container {
      max-width: 800px;
      margin: 0 auto;
    }

    .invite-form {
      margin-top: 3rem;
      display: flex;
      flex-direction: column;
      gap: 1.75rem;
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.75rem;
    }

    .form-field {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    .form-field label {
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: #888;
    }

    .form-field input,
    .form-field select,
    .form-field textarea {
      background: #000;
      border: 1px solid #333;
      color: var(--white);
      font-family: 'Inter', sans-serif;
      padding: 1rem 1.25rem;
      font-size: 0.95rem;
      border-radius: 0;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-field input:focus,
    .form-field select:focus,
    .form-field textarea:focus {
      border-color: var(--white);
    }

    .submit-btn {
      background: var(--white);
      color: var(--black);
      border: 2px solid var(--white);
      padding: 1.25rem 2.5rem;
      font-family: 'Inter', sans-serif;
      font-weight: 900;
      font-size: 0.95rem;
      letter-spacing: 1px;
      text-transform: uppercase;
      cursor: pointer;
      margin-top: 1rem;
      transition: all 0.2s ease;
    }

    .submit-btn:hover {
      background: var(--black);
      color: var(--white);
    }

    /* CIRCUIT SWITCHER */
    .circuit-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }

    .circuit-card {
      border: 1px solid var(--border-dark);
      background: #0d0d0d;
      padding: 1.75rem 1.5rem;
      text-decoration: none;
      color: var(--white);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .circuit-card:hover {
      border-color: #666;
      background: #141414;
      transform: translateY(-2px);
    }

    .circuit-quarter {
      font-size: 0.72rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #777;
      margin-bottom: 0.5rem;
    }

    .circuit-city {
      font-size: 1.35rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      margin-bottom: 0.75rem;
      color: var(--white);
    }

    .circuit-title {
      font-size: 0.8rem;
      color: #888;
      line-height: 1.4;
      margin-bottom: 1.25rem;
    }

    .circuit-link {
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--white);
    }

    /* FOOTER */
    footer {
      padding: 4rem 10%;
      background: var(--black);
      border-top: 1px solid var(--border-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1.5rem;
    }

    footer p {
      color: #777;
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .footer-links a {
      color: var(--white);
      text-decoration: none;
      margin-left: 2rem;
      font-size: 0.85rem;
      text-transform: uppercase;
      font-weight: 700;
      letter-spacing: 1px;
      border-bottom: 1px solid transparent;
      transition: border-color 0.2s ease;
    }

    .footer-links a:hover {
      border-bottom: 1px solid var(--white);
    }

    @media (max-width: 900px) {
      .sessions-grid,
      .venue-grid,
      .platforms-row,
      .circuit-grid {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
    }

    /* Accessibility: Skip link */
    .skip-link {
      position: absolute;
      top: -100%;
      left: 50%;
      transform: translateX(-50%);
      background: var(--black);
      color: var(--white);
      padding: 1rem 2rem;
      text-decoration: none;
      font-weight: 800;
      text-transform: uppercase;
      font-size: 0.85rem;
      letter-spacing: 1px;
      border: 2px solid var(--white);
      z-index: 10000;
      transition: top 0.2s ease;
    }

    .skip-link:focus {
      top: 1rem;
      outline: none;
    }

    /* Focus visible styles for keyboard navigation */
    :focus-visible {
      outline: 3px solid #00d4ff;
      outline-offset: 2px;
    }

    /* Remove default focus styles when using focus-visible */
    :focus:not(:focus-visible) {
      outline: none;
    }