:root {
        color-scheme: dark;
        --bg: #090b0f;
        --panel: #10141b;
        --panel-2: #151a23;
        --ink: #f5f0e8;
        --muted: #aab1bd;
        --line: #2a3140;
        --accent: #ff5b4f;
        --accent-2: #54d6c7;
        --accent-3: #f3c969;
        --code: #0d1117;
        --hero-scroll: 0;
      }

      * { box-sizing: border-box; }

      html {
        scroll-behavior: smooth;
      }

      body {
        margin: 0;
        font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        background: var(--bg);
        color: var(--ink);
        line-height: 1.5;
      }

      body::before,
      body::after {
        content: "";
        position: fixed;
        inset: 0;
        pointer-events: none;
      }

      body::before {
        z-index: -2;
        opacity: 0.78;
        background:
          radial-gradient(circle at 16% 10%, rgba(84, 214, 199, 0.15), transparent 30%),
          radial-gradient(circle at 86% 34%, rgba(255, 91, 79, 0.11), transparent 28%),
          radial-gradient(circle at 42% 90%, rgba(243, 201, 105, 0.08), transparent 28%);
      }

      body::after {
        z-index: -1;
        opacity: 0.12;
        background:
          repeating-linear-gradient(90deg, rgba(245, 240, 232, 0.07) 0 1px, transparent 1px 72px),
          repeating-linear-gradient(0deg, rgba(245, 240, 232, 0.05) 0 1px, transparent 1px 72px);
      }

      a { color: inherit; }

      code {
        padding: 0.08em 0.28em;
        border: 1px solid rgba(245, 240, 232, 0.16);
        border-radius: 4px;
        background: rgba(255, 255, 255, 0.04);
        color: var(--accent-3);
        font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
        font-size: 0.88em;
      }

      .topbar {
        position: sticky;
        top: 0;
        z-index: 10;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 24px;
        padding: 14px clamp(18px, 4vw, 56px);
        border-bottom: 1px solid var(--line);
        background: rgba(9, 11, 15, 0.9);
        backdrop-filter: blur(14px);
      }

      .brand { font-weight: 780; }

      nav {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: flex-end;
        gap: 0;
        color: var(--muted);
        font-size: 14px;
        font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
      }

      nav::before {
        content: "/pva/2025-2026";
        margin-right: 0.25rem;
        color: var(--accent);
        font-weight: 760;
      }

      nav a {
        display: inline-flex;
        align-items: center;
        min-height: 32px;
        padding: 0 0.35rem;
        border-radius: 4px;
        text-decoration: none;
      }

      nav a::before {
        content: "/";
        margin-right: 0.35rem;
        color: var(--line);
      }

      nav a:hover { color: var(--ink); }
      nav a[aria-current="page"],
      nav a[aria-current="true"] {
        color: var(--ink);
        background: rgba(84, 214, 199, 0.12);
      }

      a:focus-visible,
      button:focus-visible,
      iframe:focus-visible {
        outline: 3px solid var(--accent-3);
        outline-offset: 3px;
      }

      .skip-link {
        position: fixed;
        top: 12px;
        left: 12px;
        z-index: 20;
        transform: translateY(-140%);
        padding: 8px 10px;
        border-radius: 6px;
        background: var(--accent-3);
        color: #090b0f;
        font-weight: 800;
      }

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

      .hero {
        position: relative;
        isolation: isolate;
        overflow: clip;
        min-height: 70vh;
        display: grid;
        align-items: end;
        padding: clamp(52px, 8vw, 108px) clamp(18px, 4vw, 56px);
        background:
          linear-gradient(120deg, rgba(9, 11, 15, 0.18), rgba(9, 11, 15, 0.88) 68%),
          radial-gradient(circle at 16% 18%, rgba(84, 214, 199, 0.26), transparent 32%),
          radial-gradient(circle at 78% 22%, rgba(255, 91, 79, 0.22), transparent 28%),
          repeating-linear-gradient(90deg, rgba(245, 240, 232, 0.08) 0 1px, transparent 1px 46px),
          repeating-linear-gradient(0deg, rgba(245, 240, 232, 0.06) 0 1px, transparent 1px 46px),
          #0a0d12;
        background-position:
          0 0,
          0 0,
          0 0,
          0 0,
          0 0,
          0 0;
        background-size:
          auto,
          auto,
          auto,
          46px 46px,
          46px 46px,
          auto;
        animation: hero-field-drift 32s ease-in-out infinite alternate;
      }

      .hero::before,
      .hero::after {
        content: "";
        position: absolute;
        pointer-events: none;
      }

      .hero::before {
        inset: -18% -8% auto auto;
        width: min(54vw, 680px);
        aspect-ratio: 1;
        border: 1px solid rgba(84, 214, 199, 0.24);
        opacity: 0.86;
        transform: translate3d(0, calc(var(--hero-scroll) * 0.045px), 0);
        translate: 0 -8px;
        rotate: 18deg;
        animation: hero-plate-drift 18s ease-in-out infinite alternate;
        will-change: transform, translate, rotate, opacity;
      }

      .hero::after {
        left: clamp(18px, 6vw, 92px);
        bottom: -120px;
        width: min(46vw, 560px);
        aspect-ratio: 1;
        border: 1px solid rgba(255, 91, 79, 0.2);
        border-radius: 50%;
        opacity: 0.82;
        transform: translate3d(0, calc(var(--hero-scroll) * -0.035px), 0);
        translate: 0 6px;
        scale: 1;
        animation: hero-orbit-breathe 22s ease-in-out infinite alternate;
        will-change: transform, translate, scale, opacity;
      }

      @keyframes hero-plate-drift {
        from {
          opacity: 0.72;
          translate: -8px -10px;
          rotate: 16deg;
        }

        to {
          opacity: 0.96;
          translate: 10px 12px;
          rotate: 21deg;
        }
      }

      @keyframes hero-field-drift {
        from {
          background-position:
            0 0,
            0 0,
            0 0,
            0 0,
            0 0,
            0 0;
        }

        to {
          background-position:
            0 0,
            -18px 10px,
            16px -12px,
            12px 0,
            0 12px,
            0 0;
        }
      }

      @keyframes hero-orbit-breathe {
        from {
          opacity: 0.62;
          translate: 8px 10px;
          scale: 0.98;
        }

        to {
          opacity: 0.9;
          translate: -10px -4px;
          scale: 1.04;
        }
      }

      .hero-inner {
        position: relative;
        z-index: 1;
        max-width: 980px;
      }

      .eyebrow {
        margin: 0 0 12px;
        color: var(--accent-2);
        font-size: 14px;
        font-weight: 800;
        text-transform: uppercase;
      }

      h1 {
        max-width: 920px;
        margin: 0;
        font-size: clamp(44px, 8vw, 98px);
        line-height: 0.95;
        letter-spacing: 0;
      }

      .lede {
        max-width: 760px;
        margin: 24px 0 0;
        color: #d5d8de;
        font-size: clamp(18px, 2vw, 24px);
      }

      .byline {
        display: flex;
        flex-wrap: wrap;
        gap: 10px 18px;
        margin-top: 22px;
        color: var(--muted);
      }

      .byline strong { color: var(--ink); }

      .actions {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        margin-top: 30px;
      }

      .button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 42px;
        padding: 10px 15px;
        border: 1px solid var(--accent-2);
        border-radius: 6px;
        background: var(--accent-2);
        color: #06100f;
        font-weight: 800;
        text-decoration: none;
      }

      .button.secondary {
        border-color: var(--line);
        background: transparent;
        color: var(--ink);
      }

      main { padding: 0 clamp(18px, 4vw, 56px) 64px; }

      section {
        position: relative;
        max-width: 1240px;
        margin: 60px auto 0;
        scroll-margin-top: 150px;
      }

      section::before {
        content: "";
        position: absolute;
        inset: -24px -18px auto auto;
        width: 160px;
        height: 160px;
        border-top: 1px solid rgba(84, 214, 199, 0.22);
        border-right: 1px solid rgba(84, 214, 199, 0.22);
        opacity: 0.45;
        pointer-events: none;
      }

      .course-header {
        display: grid;
        gap: 12px;
        margin-top: 28px;
        padding: 34px 0 10px;
        border-bottom: 1px solid var(--line);
      }

      .course-header::before { display: none; }

      .course-header h1 {
        max-width: 860px;
        font-size: clamp(36px, 5vw, 64px);
        line-height: 1;
      }

      .course-header .lede {
        max-width: 820px;
        margin: 0;
        font-size: clamp(17px, 1.8vw, 21px);
      }

      .course-header .byline,
      .course-header .actions {
        margin-top: 0;
      }

      .section-heading {
        display: flex;
        align-items: end;
        justify-content: space-between;
        gap: 24px;
        margin-bottom: 18px;
      }

      h2 {
        margin: 0;
        font-size: clamp(28px, 4vw, 48px);
        line-height: 1.05;
        letter-spacing: 0;
      }

      .section-heading p,
      .intro {
        max-width: 700px;
        margin: 0;
        color: var(--muted);
      }

      .status-cues {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 12px;
        margin-top: 32px;
      }

      .status-cues::before { display: none; }

      .status-cue {
        display: grid;
        gap: 5px;
        padding: 14px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: rgba(16, 20, 27, 0.78);
      }

      .status-cue span {
        color: var(--accent-2);
        font-size: 12px;
        font-weight: 820;
        text-transform: uppercase;
      }

      .status-cue strong {
        font-size: 15px;
      }

      .course-tools {
        display: grid;
        grid-template-columns: minmax(280px, 0.85fr) minmax(320px, 1.15fr);
        gap: 14px;
      }

      .course-tools::before { display: none; }

      .current-session-card,
      .course-search {
        display: grid;
        align-content: start;
        gap: 14px;
        padding: 18px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: rgba(16, 20, 27, 0.82);
      }

      .current-session-card h2,
      .course-search h2 {
        font-size: clamp(26px, 3vw, 40px);
      }

      .current-session-card p,
      .course-search p {
        margin: 0;
        color: var(--muted);
      }

      .course-tool-label,
      .search-result-type {
        color: var(--accent-2);
        font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
        font-size: 12px;
        font-weight: 760;
        text-transform: uppercase;
      }

      .search-controls {
        display: grid;
        gap: 10px;
      }

      .search-controls input {
        width: 100%;
        min-height: 44px;
        padding: 10px 12px;
        border: 1px solid var(--line);
        border-radius: 6px;
        background: var(--panel-2);
        color: var(--ink);
        font: inherit;
      }

      .search-filters {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
      }

      .search-filter {
        min-height: 34px;
        padding: 7px 10px;
        border: 1px solid var(--line);
        border-radius: 999px;
        background: rgba(255, 255, 255, 0.03);
        color: var(--muted);
        font: inherit;
        font-size: 13px;
        font-weight: 720;
        cursor: pointer;
      }

      .search-filter[aria-pressed="true"] {
        border-color: rgba(84, 214, 199, 0.72);
        color: #06100f;
        background: var(--accent-2);
      }

      .search-results {
        display: grid;
        gap: 8px;
        max-height: 420px;
        margin: 0;
        padding: 0;
        overflow: auto;
        list-style: none;
      }

      .search-results li[hidden],
      .search-empty[hidden] {
        display: none;
      }

      .search-result-link {
        display: grid;
        gap: 3px;
        padding: 10px 11px;
        border: 1px solid var(--line);
        border-radius: 6px;
        background: rgba(255, 255, 255, 0.025);
        text-decoration: none;
      }

      .search-result-link strong {
        color: var(--ink);
      }

      .search-result-link span:last-child {
        color: var(--muted);
        font-size: 13px;
      }

      .search-count,
      .search-empty {
        color: var(--muted);
        font-size: 13px;
      }

      .notice {
        display: grid;
        gap: 8px;
        margin-bottom: 22px;
        padding: 16px;
        border: 1px solid rgba(84, 214, 199, 0.38);
        border-radius: 8px;
        background: rgba(84, 214, 199, 0.08);
      }

      .notice strong { color: var(--accent-2); }
      .notice p { margin: 0; color: #cbd3dc; }

      .sessions {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
        gap: 14px;
      }

      .feature-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 14px;
      }

      .session-card,
      .web-card,
      .note,
      .feature-card,
      .slides-reader {
        border: 1px solid var(--line);
        border-radius: 8px;
        background: var(--panel);
      }

      .session-card,
      .feature-card {
        display: grid;
        gap: 12px;
        padding: 18px;
      }

      .session-kicker {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        color: var(--muted);
        font-size: 13px;
      }

      .session-card h3,
      .web-card h3,
      .feature-card h3 {
        margin: 0;
        font-size: 21px;
        letter-spacing: 0;
      }

      .session-card p,
      .web-card p,
      .feature-card p,
      .note p {
        margin: 0;
        color: var(--muted);
      }

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

      .links a {
        padding: 7px 9px;
        border: 1px solid var(--line);
        border-radius: 6px;
        color: var(--ink);
        background: rgba(255, 255, 255, 0.03);
        font-size: 14px;
        font-weight: 680;
        text-decoration: none;
      }

      .links a.primary {
        border-color: rgba(84, 214, 199, 0.62);
        color: var(--accent-2);
      }

      .slides-reader {
        display: grid;
        grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
        min-height: min(82vh, 820px);
        overflow: hidden;
      }

      .slide-controls {
        display: grid;
        align-content: start;
        gap: 10px;
        padding: 16px;
        border-right: 1px solid var(--line);
        background: rgba(255, 255, 255, 0.025);
      }

      .slide-controls p {
        margin: 0 0 8px;
        color: var(--muted);
        font-size: 14px;
      }

      .slide-select-label,
      .slide-select {
        display: none;
      }

      .slide-picker {
        width: 100%;
        padding: 11px 12px;
        border: 1px solid var(--line);
        border-radius: 6px;
        background: var(--panel-2);
        color: var(--ink);
        font: inherit;
        font-weight: 720;
        text-align: left;
        cursor: pointer;
      }

      .slide-picker:hover,
      .slide-picker[aria-pressed="true"] {
        border-color: rgba(84, 214, 199, 0.72);
        color: var(--accent-2);
      }

      .slide-viewer {
        display: grid;
        grid-template-rows: auto minmax(520px, 1fr);
        min-width: 0;
      }

      .slide-viewer-bar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        padding: 12px 14px;
        border-bottom: 1px solid var(--line);
        background: var(--panel-2);
      }

      .slide-actions {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: flex-end;
        gap: 8px;
      }

      .reader-button {
        min-height: 34px;
        padding: 7px 9px;
        border: 1px solid var(--line);
        border-radius: 6px;
        background: rgba(255, 255, 255, 0.03);
        color: var(--ink);
        font: inherit;
        font-size: 14px;
        font-weight: 720;
        cursor: pointer;
      }

      .slide-viewer-bar strong {
        color: var(--ink);
      }

      .slide-viewer-bar a {
        color: var(--accent-2);
        font-size: 14px;
        font-weight: 720;
      }

      .pdf-frame {
        width: 100%;
        min-height: 520px;
        height: 100%;
        border: 0;
        background: #111;
      }

      .web-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(min(100%, 310px), 1fr));
        gap: 16px;
      }

      .web-card { overflow: hidden; }

      .preview {
        position: relative;
        aspect-ratio: 16 / 10;
        border-bottom: 1px solid var(--line);
        background: var(--code);
      }

      .preview.is-paused::after {
        content: "Preview paused until it is near the screen";
        position: absolute;
        inset: 0;
        z-index: 2;
        display: grid;
        place-items: center;
        padding: 18px;
        color: var(--muted);
        font-size: 13px;
        text-align: center;
        background: linear-gradient(135deg, rgba(13, 17, 23, 0.96), rgba(16, 20, 27, 0.96));
      }

      .preview.is-paused iframe {
        opacity: 0;
      }

      .is-hidden {
        display: none !important;
      }

      iframe {
        width: 100%;
        height: 100%;
        border: 0;
        display: block;
      }

      .web-card-content {
        display: grid;
        gap: 10px;
        padding: 16px;
      }

      .tags {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
      }

      .tag {
        padding: 4px 7px;
        border: 1px solid var(--line);
        border-radius: 999px;
        color: var(--muted);
        font-size: 12px;
      }

      .details {
        display: grid;
        gap: 4px;
        padding: 10px;
        border-radius: 6px;
        background: var(--panel-2);
        color: #cdd3dc;
        font-size: 14px;
      }

      .details span { color: var(--muted); }

      .note { padding: 18px; }

      .footer {
        display: flex;
        flex-wrap: wrap;
        gap: 10px 18px;
        margin-top: 64px;
        padding-top: 24px;
        border-top: 1px solid var(--line);
        color: var(--muted);
        font-size: 14px;
      }

      @media (max-width: 760px) {
        .topbar,
        .course-tools,
        .section-heading,
        .slides-reader {
          align-items: flex-start;
          grid-template-columns: 1fr;
          flex-direction: column;
        }

        .hero { min-height: 74vh; }

        .slide-controls {
          width: 100%;
          border-right: 0;
          border-bottom: 1px solid var(--line);
        }

        .slide-list-label,
        .slide-picker {
          display: none;
        }

        .slide-select-label {
          display: block;
          color: var(--muted);
          font-size: 14px;
        }

        .slide-select {
          display: block;
          width: 100%;
          min-height: 42px;
          padding: 8px 10px;
          border: 1px solid rgba(84, 214, 199, 0.62);
          border-radius: 6px;
          background: var(--panel-2);
          color: var(--ink);
          font: inherit;
          font-weight: 720;
        }

        .slide-viewer {
          width: 100%;
        }
      }

      @media (prefers-reduced-motion: reduce) {
        html {
          scroll-behavior: auto;
        }

        .hero,
        .hero::before,
        .hero::after {
          animation: none;
          transform: none;
          translate: none;
          rotate: none;
          scale: none;
          will-change: auto;
        }
      }