:root {
      --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      --max-width: 1120px;
      --radius: 8px;
      --shadow-soft: 0 24px 80px rgba(0, 0, 0, .22);
      --ease-out: cubic-bezier(.2, .8, .2, 1);
    }

    html[data-theme="light"] {
      --bg: #f7f5f2;
      --bg-elevated: #ffffff;
      --bg-muted: #efeeeb;
      --text: #111111;
      --text-muted: #68686d;
      --line: rgba(17, 17, 17, .11);
      --line-strong: rgba(17, 17, 17, .2);
      --accent: #e53935;
      --accent-strong: #b71c1c;
      --accent-soft: rgba(229, 57, 53, .1);
      --glass: rgba(255, 255, 255, .76);
    }

    html[data-theme="dark"] {
      --bg: #101010;
      --bg-elevated: #1b1b1d;
      --bg-muted: #242426;
      --text: #f5f5f7;
      --text-muted: #b8b8bf;
      --line: rgba(255, 255, 255, .12);
      --line-strong: rgba(255, 255, 255, .24);
      --accent: #ff453a;
      --accent-strong: #ff6b61;
      --accent-soft: rgba(255, 69, 58, .13);
      --glass: rgba(28, 28, 30, .76);
    }

    * {
      box-sizing: border-box;
    }

    html {
      width: 100%;
      max-width: 100%;
      overflow-x: hidden;
      scroll-behavior: smooth;
      background: var(--bg);
      color: var(--text);
    }

    body {
      width: 100%;
      max-width: 100%;
      min-width: 0;
      margin: 0;
      overflow-x: hidden;
      font-family: var(--font-sans);
      line-height: 1.5;
      background:
        radial-gradient(circle at 8% 4%, color-mix(in srgb, var(--accent), transparent 80%), transparent 22rem),
        radial-gradient(circle at 92% 7%, color-mix(in srgb, var(--accent-strong), transparent 84%), transparent 24rem),
        var(--bg);
      color: var(--text);
    }

    @supports (overflow: clip) {
      html,
      body {
        overflow-x: clip;
      }
    }

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

    button,
    summary {
      font: inherit;
    }

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

    .skip-link {
      position: fixed;
      left: 1rem;
      top: 1rem;
      z-index: 200;
      transform: translateY(-150%);
      border-radius: var(--radius);
      background: var(--text);
      color: var(--bg);
      padding: .75rem 1rem;
      transition: transform .2s ease;
    }

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid var(--line);
      background: color-mix(in srgb, var(--bg-elevated), transparent 16%);
      backdrop-filter: blur(22px) saturate(1.35);
    }

    .nav-shell {
      width: min(100% - 2rem, var(--max-width));
      min-height: 74px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      color: var(--text);
      font-size: 1rem;
      font-weight: 850;
      letter-spacing: 0;
      white-space: nowrap;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: .35rem;
    }

    .nav-link,
    .app-menu summary {
      min-height: 38px;
      display: inline-flex;
      align-items: center;
      border: 0;
      border-radius: 999px;
      background: transparent;
      color: var(--text-muted);
      cursor: pointer;
      font-size: .9rem;
      font-weight: 780;
      letter-spacing: 0;
      padding: .52rem .9rem;
      transition: color .2s ease, background .2s ease, transform .2s ease;
    }

    .nav-link:hover,
    .nav-link:focus-visible,
    .app-menu summary:hover,
    .app-menu summary:focus-visible {
      background: var(--bg-muted);
      color: var(--text);
      outline: none;
      transform: translateY(-1px);
    }

    .app-menu {
      position: relative;
    }

    .app-menu summary {
      list-style: none;
    }

    .app-menu summary::-webkit-details-marker {
      display: none;
    }

    .app-menu summary::after {
      content: "";
      width: .45rem;
      height: .45rem;
      margin-left: .55rem;
      border-bottom: 2px solid currentColor;
      border-right: 2px solid currentColor;
      transform: translateY(-.1rem) rotate(45deg);
      transition: transform .2s ease;
    }

    .app-menu[open] summary::after {
      transform: translateY(.1rem) rotate(225deg);
    }

    .app-menu-list {
      position: absolute;
      right: 0;
      top: calc(100% + .55rem);
      width: min(72vw, 240px);
      display: grid;
      gap: .25rem;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--bg-elevated);
      box-shadow: 0 18px 48px rgba(0, 0, 0, .14);
      padding: .45rem;
    }

    .app-menu-list a {
      border-radius: calc(var(--radius) - 2px);
      color: var(--text-muted);
      font-size: .92rem;
      font-weight: 750;
      padding: .72rem .8rem;
      transition: background .2s ease, color .2s ease;
    }

    .app-menu-list a:hover,
    .app-menu-list a:focus-visible {
      background: var(--bg-muted);
      color: var(--text);
      outline: none;
    }

    .hero {
      position: relative;
      min-height: 560px;
      overflow: hidden;
      border-bottom: 1px solid var(--line);
    }

    .hero::after {
      content: "";
      position: absolute;
      inset: auto 0 0;
      height: 28%;
      background: linear-gradient(180deg, transparent, var(--bg));
      pointer-events: none;
    }

    .hero-art {
      --hero-art-opacity: .9;
      position: absolute;
      top: 9%;
      right: max(-6rem, calc((100vw - var(--max-width)) / 2 - 2rem));
      width: min(52vw, 560px);
      max-height: min(86vh, 680px);
      min-width: 300px;
      height: auto;
      object-fit: contain;
      opacity: var(--hero-art-opacity);
      -webkit-clip-path: inset(10px);
      clip-path: inset(10px);
      filter: drop-shadow(0 34px 52px rgba(0, 0, 0, .28));
      transform: rotate(4deg);
    }

    @media (prefers-reduced-motion: no-preference) {
      .hero-art {
        animation: hero-mockup-rise .92s var(--ease-out) .1s both;
      }

      .hero .eyebrow,
      .hero h1,
      .hero-copy,
      .hero-actions {
        opacity: 0;
        transform: translateY(18px);
        animation: page-rise .72s var(--ease-out) both;
      }

      .hero h1 {
        animation-delay: .08s;
      }

      .hero-copy {
        animation-delay: .16s;
      }

      .hero-actions {
        animation-delay: .24s;
      }

      .motion-ready .reveal {
        opacity: 0;
        transform: translateY(34px);
        transition: opacity .72s ease, transform .72s var(--ease-out);
        transition-delay: var(--reveal-delay, 0ms);
      }

      .motion-ready .reveal.in-view {
        opacity: 1;
        transform: translateY(0);
      }

      .motion-ready .stagger > * {
        opacity: 0;
        transform: translateY(22px);
        transition: opacity .6s ease, transform .6s var(--ease-out);
        transition-delay: calc(var(--i, 0) * 80ms);
      }

      .motion-ready .stagger.in-view > * {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes hero-mockup-rise {
      from {
        opacity: 0;
        transform: translateY(70px) rotate(4deg) scale(.96);
      }

      to {
        opacity: var(--hero-art-opacity);
        transform: translateY(0) rotate(4deg) scale(1);
      }
    }

    @keyframes page-rise {
      from {
        opacity: 0;
        transform: translateY(18px);
      }

      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .hero-inner {
      position: relative;
      z-index: 1;
      width: min(100% - 2rem, var(--max-width));
      margin: 0 auto;
      padding: clamp(4rem, 8vw, 7rem) 0 clamp(4rem, 7vw, 6rem);
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: .55rem;
      color: var(--text-muted);
      font-size: .82rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: .08em;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: var(--accent);
      box-shadow: 0 0 0 7px var(--accent-soft);
    }

    .hero .eyebrow {
      color: var(--accent);
      font-size: .78rem;
      font-weight: 850;
    }

    .hero .eyebrow::before {
      content: none;
      display: none;
    }

    h1,
    h2,
    h3,
    p {
      margin: 0;
    }

    .hero h1 {
      max-width: 720px;
      margin-top: 1.1rem;
      font-size: clamp(4.2rem, 9vw, 8.4rem);
      line-height: .9;
      letter-spacing: 0;
    }

    .hero-copy {
      max-width: 650px;
      margin-top: 1.35rem;
      color: var(--text-muted);
      font-size: clamp(1.1rem, 2vw, 1.35rem);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: .8rem;
      margin-top: 2rem;
    }

    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: .75rem 1rem;
      font-weight: 800;
      transition: transform .2s ease, border-color .2s ease, background .2s ease, box-shadow .2s ease;
    }

    .button.primary {
      border-color: transparent;
      background: var(--accent);
      color: #fff;
      box-shadow:
        0 0 14px color-mix(in srgb, var(--accent), transparent 82%),
        0 12px 28px color-mix(in srgb, var(--accent), transparent 86%);
    }

    .button.primary:hover,
    .button.primary:focus-visible {
      box-shadow:
        0 0 18px color-mix(in srgb, var(--accent), transparent 78%),
        0 14px 32px color-mix(in srgb, var(--accent), transparent 84%);
    }

    .button.secondary {
      background: color-mix(in srgb, var(--bg-elevated), transparent 12%);
    }

    .button.privacy-button {
      --privacy-blue: #0a66c2;
      border-color: color-mix(in srgb, var(--privacy-blue), var(--line) 58%);
      background: color-mix(in srgb, var(--privacy-blue), var(--bg-elevated) 88%);
      color: color-mix(in srgb, var(--privacy-blue), var(--text) 28%);
      box-shadow: 0 10px 26px color-mix(in srgb, var(--privacy-blue), transparent 90%);
    }

    html[data-theme="dark"] .button.privacy-button {
      --privacy-blue: #67a9ff;
      background: color-mix(in srgb, var(--privacy-blue), var(--bg-elevated) 84%);
      color: color-mix(in srgb, var(--privacy-blue), #ffffff 36%);
      box-shadow: 0 10px 28px color-mix(in srgb, var(--privacy-blue), transparent 88%);
    }

    .button.privacy-button:hover,
    .button.privacy-button:focus-visible {
      border-color: color-mix(in srgb, var(--privacy-blue), var(--line-strong) 28%);
      background: color-mix(in srgb, var(--privacy-blue), var(--bg-elevated) 80%);
    }

    .button:hover,
    .button:focus-visible {
      transform: translateY(-2px);
      border-color: var(--line-strong);
    }

    .section {
      width: min(100% - 2rem, var(--max-width));
      margin: 0 auto;
      padding: clamp(4rem, 8vw, 7rem) 0;
      scroll-margin-top: 96px;
    }

    .section-heading {
      display: grid;
      grid-template-columns: minmax(0, .85fr) minmax(260px, .58fr);
      gap: clamp(1.5rem, 4vw, 3rem);
      align-items: end;
      margin-bottom: 2rem;
    }

    .section-kicker {
      color: var(--accent);
      font-size: .82rem;
      font-weight: 850;
      line-height: 1;
      letter-spacing: .08em;
      text-transform: uppercase;
    }

    .section-heading h2,
    .app-title,
    .round-copy h2,
    .run-copy h2,
    .credentials-copy h2,
    .plugin-copy h2 {
      margin-top: .6rem;
      font-size: clamp(2.2rem, 5vw, 4.3rem);
      line-height: .95;
      letter-spacing: 0;
    }

    .section-heading p,
    .app-intro p,
    .app-copy,
    .run-summary,
    .credentials-summary,
    .info-card p,
    .info-card li,
    .privacy-list li,
    .support-copy p,
    .contact-box p {
      color: var(--text-muted);
    }

    .app-intro {
      display: grid;
      grid-template-columns: minmax(0, .9fr) minmax(280px, .5fr);
      gap: 1rem;
      align-items: stretch;
    }

    .intro-panel,
    .stat-panel,
    .support-copy,
    .contact-box,
    .privacy-panel {
      border: 1px solid var(--line);
      border-radius: 8px;
      background: var(--bg-elevated);
      padding: 1.3rem;
    }

    .intro-panel p + p {
      margin-top: 1rem;
    }

    .stat-panel {
      display: grid;
      gap: 1rem;
      align-content: start;
    }

    .stat-panel div {
      border-top: 1px solid var(--line);
      padding-top: 1rem;
    }

    .stat-panel div:first-child {
      border-top: 0;
      padding-top: 0;
    }

    .stat-panel strong {
      display: block;
      font-size: 1.35rem;
      line-height: 1;
    }

    .stat-panel span {
      display: block;
      margin-top: .35rem;
      color: var(--text-muted);
      font-size: .92rem;
    }

    .app-overview {
      display: grid;
      grid-template-columns: minmax(0, .66fr) minmax(280px, .34fr);
      gap: 1rem;
      align-items: start;
      margin-bottom: 2rem;
    }

    .app-copy {
      border-left: 3px solid var(--accent);
      padding-left: 1rem;
      font-size: clamp(1rem, 2vw, 1.12rem);
    }

    .run-showcase {
      grid-template-columns: minmax(0, .58fr) minmax(300px, .42fr);
      align-items: center;
      gap: clamp(1.5rem, 5vw, 4rem);
      margin-bottom: 2rem;
    }

    .round-showcase {
      grid-template-columns: minmax(0, .58fr) minmax(300px, .42fr);
      align-items: center;
      gap: clamp(1.5rem, 5vw, 4rem);
      margin-bottom: 1rem;
    }

    .round-copy,
    .run-copy,
    .credentials-copy {
      display: grid;
      gap: 1rem;
      align-content: center;
    }

    .plugin-showcase {
      grid-template-columns: minmax(0, .5fr) minmax(320px, .5fr);
      align-items: center;
      gap: clamp(1.5rem, 5vw, 4rem);
      margin-bottom: 2rem;
    }

    .plugin-copy {
      display: grid;
      gap: 1rem;
      align-content: center;
    }

    .round-summary,
    .run-summary,
    .credentials-summary {
      max-width: 38rem;
      color: var(--text-muted);
      font-size: clamp(1.05rem, 2vw, 1.22rem);
    }

    .coming-soon-badge {
      width: fit-content;
      border: 1px solid color-mix(in srgb, var(--accent), transparent 28%);
      border-radius: 999px;
      background: var(--accent-soft);
      color: var(--accent);
      font-size: .78rem;
      font-weight: 850;
      letter-spacing: .08em;
      padding: .38rem .72rem;
      text-transform: uppercase;
    }

    .round-rummy-media {
      margin: 0;
      perspective: 1200px;
    }

    .round-rummy-media img {
      width: auto;
      max-height: min(72vh, 590px);
      max-width: 100%;
      margin: 0 auto;
      background: transparent;
      -webkit-clip-path: inset(3px);
      clip-path: inset(3px);
      filter: drop-shadow(0 24px 42px rgba(0, 0, 0, .22));
      transform: rotate(-6deg);
    }

    .plugin-summary {
      max-width: 40rem;
      color: var(--text-muted);
      font-size: clamp(1.05rem, 2vw, 1.22rem);
    }

    .plugin-media {
      margin: 0;
    }

    .download-panel {
      display: grid;
      gap: .55rem;
      align-items: start;
      margin-top: .35rem;
    }

    .download-panel .button {
      width: fit-content;
    }

    .download-meta {
      display: grid;
      gap: .35rem;
      margin: 0;
      color: var(--text-muted);
      font-size: .9rem;
    }

    .checksum-toggle summary {
      width: fit-content;
      color: var(--accent);
      font-weight: 850;
      cursor: pointer;
      list-style: none;
    }

    .checksum-toggle summary::-webkit-details-marker {
      display: none;
    }

    .checksum-toggle code {
      display: block;
      margin-top: .35rem;
      color: var(--text);
      font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
      font-size: .82rem;
      overflow-wrap: anywhere;
      word-break: break-word;
    }

    .plugin-media img {
      width: 100%;
      border: 1px solid var(--line);
      border-radius: 8px;
      background: color-mix(in srgb, var(--bg-elevated), transparent 8%);
      box-shadow: var(--shadow-soft);
    }

    .app-media {
      border: 1px solid var(--line);
      border-radius: 8px;
      background: color-mix(in srgb, var(--bg-elevated), transparent 8%);
      overflow: hidden;
    }

    .app-media img {
      width: 100%;
      height: 100%;
      max-height: 430px;
      object-fit: contain;
      object-position: center;
      padding: 1rem;
    }

    .run-carousel {
      display: grid;
      gap: 1rem;
      background: transparent;
      margin-bottom: 0;
    }

    .run-carousel-track {
      position: relative;
      min-height: min(86vw, 520px);
      overflow: hidden;
      background: transparent;
      -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 96%, rgba(0, 0, 0, .78) 98%, transparent 100%);
      mask-image: linear-gradient(180deg, #000 0%, #000 96%, rgba(0, 0, 0, .78) 98%, transparent 100%);
    }

    .run-slide {
      position: absolute;
      top: 0;
      left: 50%;
      width: auto;
      height: 150%;
      max-width: none;
      object-fit: contain;
      object-position: center;
      opacity: 0;
      background: transparent;
      filter: drop-shadow(0 20px 34px rgba(0, 0, 0, .18));
      transform: translateX(-50%) scale(.98);
      transition: opacity .45s ease, transform .45s var(--ease-out);
    }

    .run-slide.is-active {
      opacity: 1;
      transform: translateX(-50%) scale(1);
    }

    .run-carousel-dots {
      display: flex;
      justify-content: center;
      gap: .55rem;
    }

    .run-dot {
      width: .65rem;
      height: .65rem;
      border: 0;
      border-radius: 999px;
      background: color-mix(in srgb, var(--text-muted), transparent 50%);
      cursor: pointer;
      padding: 0;
      transition: background .2s ease, transform .2s ease;
    }

    .run-dot:hover,
    .run-dot:focus-visible {
      background: var(--text-muted);
      outline: none;
      transform: scale(1.18);
    }

    .run-dot.is-active {
      background: var(--accent);
      transform: scale(1.24);
    }

    .credentials-phone-stage {
      position: relative;
      display: grid;
      place-items: center;
      justify-items: center;
      min-height: min(82vw, 540px);
      margin: 0;
      overflow: visible;
      background:
        linear-gradient(180deg, transparent 0%, transparent 66%, color-mix(in srgb, var(--bg), transparent 6%) 100%);
      -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 96%, rgba(0, 0, 0, .78) 98%, transparent 100%);
      mask-image: linear-gradient(180deg, #000 0%, #000 96%, rgba(0, 0, 0, .78) 98%, transparent 100%);
    }

    .credentials-portrait {
      width: auto;
      max-width: min(74vw, 330px);
      max-height: min(82vw, 540px);
      height: auto;
      object-fit: contain;
      object-position: center;
      filter: drop-shadow(0 28px 48px rgba(0, 0, 0, .24));
      transform: rotate(5deg) translateY(4%);
    }

    .info-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      align-items: start;
      gap: 1rem;
    }

    #round-rummy-docs {
      scroll-margin-top: 76px;
    }

    .info-card {
      min-height: 0;
      border: 1px solid var(--line);
      border-radius: 8px;
      background: var(--bg-elevated);
      overflow: hidden;
      cursor: pointer;
      transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
    }

    .info-card:hover,
    .info-card:focus-within {
      border-color: var(--line-strong);
      box-shadow: var(--shadow-soft);
      transform: translateY(-3px);
    }

    .info-card summary {
      min-height: 0;
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
      list-style: none;
      outline: none;
      padding: 1.2rem;
    }

    .info-card summary::-webkit-details-marker {
      display: none;
    }

    .info-card[open] summary {
      min-height: auto;
      border-bottom: 1px solid var(--line);
      padding-bottom: 1rem;
    }

    .info-card h3 {
      font-size: 1.18rem;
      line-height: 1.1;
    }

    .info-card p {
      margin-top: .85rem;
    }

    .info-card .details-list {
      display: grid;
      gap: .8rem;
      margin: 0;
      padding: 1.15rem 1.2rem 1.2rem 2.35rem;
      color: var(--text-muted);
    }

    .coming-soon-copy {
      margin: 0;
      padding: 1.15rem 1.2rem 1.2rem;
      color: var(--text-muted);
      font-weight: 850;
    }

    .privacy-panel {
      margin-top: 1rem;
    }

    .privacy-list {
      display: grid;
      gap: 1rem;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .privacy-list li {
      border-top: 1px solid var(--line);
      padding-top: 1rem;
    }

    .privacy-list li:first-child {
      border-top: 0;
      padding-top: 0;
    }

    .support-panel {
      display: grid;
      grid-template-columns: minmax(0, .75fr) minmax(260px, .42fr);
      gap: 1rem;
      align-items: stretch;
    }

    .contact-box {
      display: grid;
      gap: 1rem;
      align-content: start;
    }

    .site-footer {
      width: min(100% - 2rem, var(--max-width));
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      gap: 1rem;
      border-top: 1px solid var(--line);
      padding: 1.5rem 0 2rem;
      color: var(--text-muted);
      font-size: .9rem;
    }

    @media (max-width: 860px) {
      .nav-shell {
        width: min(100% - 1rem, var(--max-width));
      }

      .hero {
        min-height: auto;
      }

      .hero-art {
        top: 1rem;
        right: -7rem;
        width: min(58vw, 300px);
        min-width: 0;
        max-height: 520px;
        --hero-art-opacity: .22;
      }

      .hero h1 {
        font-size: clamp(3.7rem, 17vw, 6.2rem);
      }

      .section-heading,
      .app-intro,
      .app-overview,
      .plugin-showcase,
      .support-panel,
      .info-grid {
        grid-template-columns: 1fr;
      }

      .round-rummy-media img {
        transform: rotate(-4deg);
      }

      .app-menu-list {
        right: 50%;
        transform: translateX(50%);
      }
    }

    @media (max-width: 520px) {
      .nav-shell {
        min-height: auto;
        flex-wrap: wrap;
        padding: .75rem 0;
      }

      .nav-actions {
        width: 100%;
        flex-wrap: wrap;
        justify-content: flex-start;
      }

      .nav-link,
      .app-menu summary {
        font-size: .86rem;
        padding: .5rem .65rem;
      }

      .section,
      .hero-inner,
      .site-footer {
        width: min(100% - 1.25rem, var(--max-width));
      }

      .run-carousel-track {
        min-height: 460px;
      }

      .round-rummy-media img {
        width: auto;
        max-height: min(72vh, 520px);
      }

      .site-footer {
        flex-direction: column;
      }
    }