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

    /* VARIABLES */
    :root {
      --black: #000000;
      --white: #ffffff;
      --gray: #666666;
      --light-gray: #a0a0a0;
      --border-dark: #262626;
      --card-bg: #0a0a0a;
    }

    html { scroll-behavior: smooth; }

    /* 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;
    }

    body {
      font-family: 'Inter', sans-serif;
      background-color: var(--black);
      color: var(--white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    /* HERO */
    .summit-hero {
      min-height: 85vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 6rem 10%;
      background: var(--black);
      position: relative;
      border-bottom: 1px solid var(--border-dark);
    }

    .summit-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: 2rem;
      color: #e5e5e5;
    }

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

    .summit-hero h1 {
      font-size: clamp(2.75rem, 6.5vw, 5.5rem);
      font-weight: 900;
      line-height: 1.08;
      letter-spacing: -2px;
      text-transform: uppercase;
      color: var(--white);
      margin-bottom: 2rem;
    }

    .summit-hero p {
      font-size: clamp(1.1rem, 1.8vw, 1.35rem);
      color: var(--light-gray);
      max-width: 850px;
      line-height: 1.65;
      margin-bottom: 3rem;
    }

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

    .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;
    }

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

    .btn-secondary {
      background: transparent;
      color: var(--white);
      padding: 1rem 2.25rem;
      text-decoration: none;
      font-weight: 800;
      text-transform: uppercase;
      font-size: 0.85rem;
      letter-spacing: 1px;
      border: 2px solid #555;
      transition: all 0.2s ease;
    }

    .btn-secondary:hover {
      border-color: var(--white);
      background: #111;
    }

    /* PROTOCOLS SECTION */
    .section-protocols {
      padding: 6rem 10%;
      border-bottom: 1px solid var(--border-dark);
      background: #050505;
    }

    .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, 4vw, 3.5rem);
      font-weight: 900;
      letter-spacing: -1.5px;
      text-transform: uppercase;
      margin-bottom: 3.5rem;
      color: var(--white);
    }

    .protocol-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .protocol-card {
      border: 1px solid var(--border-dark);
      background: var(--card-bg);
      padding: 2.5rem;
      position: relative;
    }

    .protocol-num {
      font-size: 2.5rem;
      font-weight: 900;
      color: #333;
      letter-spacing: -1px;
      margin-bottom: 1.25rem;
    }

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

    .protocol-card p {
      font-size: 0.95rem;
      color: #aaa;
      line-height: 1.6;
    }

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

    .calendar-phase-section {
      margin-top: 4rem;
      padding-top: 3rem;
      border-top: 1px solid var(--border-dark);
    }

    .calendar-phase-section:first-of-type {
      margin-top: 2.5rem;
      padding-top: 0;
      border-top: none;
    }

    .phase-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      margin-bottom: 2rem;
      flex-wrap: wrap;
      gap: 1.5rem;
    }

    .phase-title-group {
      max-width: 720px;
    }

    .phase-badge {
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: #777;
      display: inline-block;
      margin-bottom: 0.4rem;
    }

    .phase-title {
      font-size: 1.6rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      color: var(--white);
      margin-bottom: 0.4rem;
    }

    .phase-desc {
      font-size: 0.95rem;
      color: #999;
      line-height: 1.5;
    }

    .phase-region-pill {
      border: 1px solid #333;
      background: #111;
      padding: 0.4rem 0.9rem;
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #ccc;
    }

    .summit-horizontal-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .summit-card-box {
      border: 1px solid var(--border-dark);
      background: var(--card-bg);
      padding: 2.25rem 2rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: border-color 0.2s ease, transform 0.2s ease;
    }

    .summit-card-box:hover {
      border-color: #555;
      transform: translateY(-2px);
    }

    .summit-card-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.25rem;
      padding-bottom: 0.75rem;
      border-bottom: 1px solid #1a1a1a;
    }

    .summit-quarter-tag {
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: #888;
    }

    .summit-status-badge {
      font-size: 0.7rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #888;
    }

    .summit-status-badge.live {
      color: #00ff66;
    }

    .summit-card-city {
      font-size: 1.85rem;
      font-weight: 900;
      letter-spacing: -1px;
      text-transform: uppercase;
      color: var(--white);
      margin-bottom: 0.35rem;
    }

    .summit-card-date {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--light-gray);
      margin-bottom: 1.25rem;
    }

    .summit-card-title {
      font-size: 1.15rem;
      font-weight: 800;
      letter-spacing: -0.3px;
      margin-bottom: 0.85rem;
      line-height: 1.4;
    }

    .summit-card-title a {
      color: var(--white);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .summit-card-title a:hover {
      color: #aaa;
    }

    .summit-card-desc {
      font-size: 0.9rem;
      color: #999;
      line-height: 1.55;
      margin-bottom: 1.5rem;
    }

    .summit-card-tags {
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
      margin-bottom: 1.75rem;
    }

    .summit-card-tag {
      background: #141414;
      border: 1px solid #282828;
      padding: 0.25rem 0.6rem;
      font-size: 0.7rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #ccc;
    }

    .summit-card-footer {
      margin-top: auto;
      padding-top: 1.5rem;
      border-top: 1px solid #1a1a1a;
      display: flex;
      flex-direction: column;
      gap: 0.85rem;
    }

    .summit-card-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: var(--white);
      color: var(--black);
      padding: 0.85rem 1rem;
      font-size: 0.8rem;
      font-weight: 800;
      letter-spacing: 0.5px;
      text-decoration: none;
      text-transform: uppercase;
      transition: background 0.2s ease;
    }

    .summit-card-btn:hover {
      background: #ccc;
    }

    .summit-card-platforms {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.75rem;
      color: #666;
    }

    .summit-card-platforms a {
      color: #888;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      font-weight: 600;
      transition: color 0.2s ease;
    }

    .summit-card-platforms a:hover {
      color: var(--white);
    }

    .summit-card-platforms svg {
      width: 12px;
      height: 12px;
      fill: currentColor;
    }

    /* AGENDA TEARDOWNS */
    .section-tracks {
      padding: 6rem 10%;
      border-bottom: 1px solid var(--border-dark);
      background: #050505;
    }

    .tracks-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }

    .track-card {
      border: 1px solid var(--border-dark);
      background: var(--card-bg);
      padding: 2.5rem;
    }

    .track-pill {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #888;
      margin-bottom: 1rem;
    }

    .track-card h3 {
      font-size: 1.3rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 1rem;
      color: var(--white);
    }

    .track-card p {
      font-size: 0.95rem;
      color: #aaa;
      line-height: 1.6;
    }

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

    .cohort-group {
      margin-bottom: 3.5rem;
    }

    .cohort-group:last-child {
      margin-bottom: 0;
    }

    .cohort-group-label {
      font-size: 0.85rem;
      font-weight: 800;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: #777;
      margin-bottom: 1.5rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid var(--border-dark);
    }

    .cohort-names {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }

    .cohort-box {
      border: 1px solid var(--border-dark);
      background: #0d0d0d;
      padding: 1.75rem 1.25rem;
      text-align: center;
      transition: border-color 0.2s ease;
    }

    .cohort-box:hover {
      border-color: #555;
    }

    .cohort-box .name {
      font-size: 1.1rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      color: var(--white);
    }

    .cohort-box .role-desc {
      font-size: 0.75rem;
      color: #777;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-top: 0.4rem;
    }

    /* INVITATION FORM SECTION */
    .section-invite {
      padding: 7rem 10%;
      border-bottom: 1px solid var(--border-dark);
      background: #080808;
    }

    .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);
    }

    /* 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);
    }

    /* PLATFORM LISTINGS & BADGES */
    .hero-platforms-bar {
      display: flex;
      align-items: center;
      gap: 1.25rem;
      margin-top: 2.5rem;
      flex-wrap: wrap;
      padding-top: 1.75rem;
      border-top: 1px solid #222;
    }

    .hero-platforms-label {
      font-size: 0.75rem;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: #777;
    }

    .platform-pill-link {
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      background: #111;
      border: 1px solid #333;
      padding: 0.5rem 1rem;
      color: var(--white);
      text-decoration: none;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      transition: all 0.2s ease;
    }

    .platform-pill-link:hover {
      background: #1c1c1c;
      border-color: var(--white);
      color: var(--white);
      transform: translateY(-1px);
    }

    .platform-pill-icon {
      width: 14px;
      height: 14px;
      fill: currentColor;
      flex-shrink: 0;
    }

    .hero-platforms-note {
      font-size: 0.75rem;
      color: #666;
      letter-spacing: 0.5px;
      text-transform: uppercase;
    }

    /* SECTION PLATFORMS / MULTI-CHANNEL REGISTRATION */
    .section-platforms {
      padding: 6rem 10%;
      border-bottom: 1px solid var(--border-dark);
      background: #070707;
    }

    .platforms-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }

    .platform-feature-card {
      border: 1px solid var(--border-dark);
      background: var(--card-bg);
      padding: 3rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: border-color 0.2s ease;
    }

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

    .platform-feature-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-bottom: 1.5rem;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .platform-feature-brand {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .platform-feature-brand svg {
      width: 28px;
      height: 28px;
      fill: var(--white);
      flex-shrink: 0;
    }

    .platform-feature-brand h3 {
      font-size: 1.5rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      color: var(--white);
      margin: 0;
    }

    .platform-type-tag {
      font-size: 0.7rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      padding: 0.35rem 0.75rem;
      background: #141414;
      border: 1px solid #333;
      color: #aaa;
      white-space: nowrap;
    }

    .platform-feature-desc {
      font-size: 0.95rem;
      color: #aaa;
      line-height: 1.65;
      margin-bottom: 2rem;
    }

    .platform-bullet-list {
      list-style: none;
      padding: 0;
      margin: 0 0 2.5rem 0;
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
    }

    .platform-bullet-list li {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 0.85rem;
      color: #ccc;
      font-weight: 500;
    }

    .platform-bullet-list li::before {
      content: "—";
      color: #666;
      font-weight: 800;
    }

    .platform-action-link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.75rem;
      background: #111;
      border: 1px solid #444;
      color: var(--white);
      padding: 1rem 1.75rem;
      text-decoration: none;
      font-size: 0.82rem;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
      transition: all 0.2s ease;
      width: fit-content;
    }

    .platform-action-link:hover {
      background: var(--white);
      color: var(--black);
      border-color: var(--white);
    }

    /* CALENDAR ITEM PLATFORM CHIPS */
    .summit-platform-links {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.72rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      color: #666;
      margin-top: 0.35rem;
      flex-wrap: wrap;
      justify-content: flex-end;
    }

    .summit-platform-links a {
      color: #888;
      text-decoration: none;
      transition: color 0.2s ease;
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
    }

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

    .summit-platform-links svg {
      width: 12px;
      height: 12px;
      fill: currentColor;
    }

    /* INVITE FORM DIRECT REGISTRATION CALLOUT */
    .invite-platforms-callout {
      border: 1px solid #333;
      background: #0f0f0f;
      padding: 2.25rem;
      margin-bottom: 2.75rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1.5rem;
    }

    .callout-content h4 {
      font-size: 1.15rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      color: var(--white);
      margin: 0.35rem 0;
    }

    .callout-content p {
      font-size: 0.9rem;
      color: #888;
      margin: 0;
      line-height: 1.5;
    }

    .callout-tag {
      font-size: 0.7rem;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: #00ff66;
    }

    .callout-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .callout-btn {
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      background: #000;
      border: 1px solid #444;
      color: var(--white);
      padding: 0.85rem 1.4rem;
      text-decoration: none;
      font-size: 0.8rem;
      font-weight: 800;
      letter-spacing: 0.75px;
      text-transform: uppercase;
      transition: all 0.2s ease;
    }

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

    .callout-btn svg {
      width: 14px;
      height: 14px;
      fill: currentColor;
    }

    /* RESPONSIVE */
    @media (max-width: 1100px) {
      .summit-horizontal-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 900px) {
      .protocol-grid,
      .tracks-grid,
      .cohort-names,
      .platforms-grid,
      .summit-horizontal-grid {
        grid-template-columns: 1fr;
      }
      .phase-header {
        flex-direction: column;
        align-items: flex-start;
      }
      .summit-date-col {
        border-right: none;
        border-bottom: 1px solid var(--border-dark);
        padding-right: 0;
        padding-bottom: 1rem;
      }
      .summit-action-col {
        align-items: flex-start;
      }
      .summit-platform-links {
        justify-content: flex-start;
      }
      .invite-platforms-callout {
        flex-direction: column;
        align-items: flex-start;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
    }