:root {
      --bg: #FBFBF7;
      --paper: #FFFFFF;
      --text: #0B0D10;
      --muted: #5E6673;
      --line: #E7E9EE;
      --soft: #F2F3F6;

      --radius: 18px;
      --radius2: 14px;
      --max: 1100px;

      --shadow: 0 18px 45px rgba(11, 13, 16, .08);
      --shadow2: 0 10px 30px rgba(11, 13, 16, .06);

      --navH: 74px;
      --active: #0B0D10;
    }

    @font-face {
      font-family: 'yekan';
      src: url('../fonts/IRANYekanMedium.ttf');
      font-display: swap;
    }

    /* Critical CSS inline optimization */
    .hero {
      content-visibility: auto;
    }

    [data-theme="dark"] {
      --bg: #0B0D10;
      --paper: #101319;
      --text: #F2F4F8;
      --muted: rgba(242, 244, 248, .68);
      --line: rgba(242, 244, 248, .10);
      --soft: rgba(242, 244, 248, .06);
      --shadow: 0 18px 45px rgba(0, 0, 0, .45);
      --shadow2: 0 10px 30px rgba(0, 0, 0, .35);
      --active: #F2F4F8;
    }

    * {
      box-sizing: border-box;
      font-family: yekan;

    }

    html,
    body {
      height: 100%;
    }

    body {
      margin: 0;
      background: var(--bg);
      color: var(--text);
      letter-spacing: .1px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      padding-bottom: calc(var(--navH) + 14px);
      /* space for bottom nav */
    }

    .wrap {
      max-width: var(--max);
      margin: 0 auto;
      padding: 14px 16px 18px;
    }

    /* Hero */
    .hero {
      margin-top: 14px;
      padding: 20px 16px;
      border-radius: var(--radius);
      background: var(--paper);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      width: 420px;
      height: 420px;
      right: -260px;
      top: -300px;
      background: radial-gradient(circle at 30% 30%, rgba(11, 13, 16, .07), transparent 60%);
      pointer-events: none;
    }

    [data-theme="dark"] .hero::before {
      background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, .06), transparent 60%);
    }

    .hero>* {
      position: relative;
    }

    .brandRow {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      margin-bottom: 6px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      user-select: none;
    }

    .mark {
      width: 34px;
      height: 34px;
      border-radius: 10px;
      border: 1px solid var(--line);
      background: linear-gradient(180deg, var(--paper), var(--soft));
      box-shadow: var(--shadow2);
      display: grid;
      place-items: center;
      font-weight: 850;
      letter-spacing: -.4px;
    }

    .brand b {
      display: block;
      font-size: 13.2px;
      letter-spacing: -.2px;
      margin-bottom: 1px;
      line-height: 1.2;
    }

    .brand span {
      display: block;
      font-size: 11.7px;
      color: var(--muted);
      line-height: 1.2;
    }

    .toggle {
      cursor: pointer;
      border: 1px solid var(--line);
      background: var(--paper);
      color: var(--text);
      padding: 9px 12px;
      border-radius: 999px;
      font-size: 12.5px;
      transition: .16s ease;
      box-shadow: var(--shadow2);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }

    [data-theme="dark"] .toggle {
      background: rgba(255, 255, 255, .04);
    }

    .toggle:hover {
      transform: translateY(-1px);
    }

    .kicker {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 7px 10px;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: color-mix(in oklab, var(--soft) 70%, var(--paper));
      color: var(--muted);
      font-size: 12px;
    }

    .dot {
      width: 7px;
      height: 7px;
      border-radius: 99px;
      background: #16A34A;
      box-shadow: 0 0 0 4px rgba(22, 163, 74, .10);
    }

    h1 {
      margin: 14px 0 10px;
      font-size: clamp(26px, 7vw, 44px);
      line-height: 1.12;
      letter-spacing: -1px;
      display: block;
    }

    h1 .h1-subtitle {
      display: block;
      font-size: 0.65em;
      opacity: 0.75;
      margin-top: 6px;
      font-weight: 500;
    }

    h2 {
      margin: 20px 0 10px;
      font-size: clamp(20px, 5vw, 32px);
      line-height: 1.2;
    }

    h3 {
      margin: 16px 0 8px;
      font-size: clamp(16px, 4vw, 24px);
      line-height: 1.3;
      color: var(--text);
    }

    .lead {
      margin: 0;
      color: var(--muted);
      font-size: 14.5px;
      line-height: 2;
    }

    /* Mobile-first vertical */
    .heroRow {
      display: grid;
      grid-template-columns: 1fr;
      gap: 12px;
      margin-top: 14px;
    }

    .panel {
      border: 1px solid var(--line);
      border-radius: var(--radius2);
      background: color-mix(in oklab, var(--paper) 92%, var(--soft));
      padding: 14px;
    }

    [data-theme="dark"] .panel {
      background: rgba(255, 255, 255, .03);
    }

    .ctaTitle {
      font-weight: 850;
      letter-spacing: -.2px;
      font-size: 13.5px;
      margin-bottom: 8px;
    }

    .ctaText {
      margin: 0;
      color: var(--muted);
      font-size: 12.8px;
      line-height: 1.95;
    }

    /* Full-width buttons on mobile */
    .btnRow {
      display: grid;
      grid-template-columns: 1fr;
      gap: 10px;
      margin-top: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 12px 14px;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: var(--paper);
      color: var(--text);
      text-decoration: none;
      font-size: 13px;
      transition: .16s ease;
      box-shadow: var(--shadow2);
      width: 100%;
    }

    [data-theme="dark"] .btn {
      background: rgba(255, 255, 255, .04);
    }

    .btn:hover {
      transform: translateY(-1px);
      border-color: color-mix(in oklab, var(--line) 60%, var(--text));
    }

    .btn.primary {
      background: var(--text);
      color: var(--bg);
      border-color: var(--text);
      box-shadow: 0 16px 40px rgba(11, 13, 16, .18);
    }

    [data-theme="dark"] .btn.primary {
      background: #F2F4F8;
      color: #0B0D10;
      border-color: #F2F4F8;
      box-shadow: 0 16px 40px rgba(0, 0, 0, .45);
    }

    /* Sections */
    .section {
      margin-top: 12px;
      padding: 18px 16px;
      border-radius: var(--radius);
      background: var(--paper);
      border: 1px solid var(--line);
      box-shadow: var(--shadow2);
    }

    .head {
      margin-bottom: 10px;
    }

    h2 {
      margin: 0;
      font-size: 15px;
      letter-spacing: -.25px;
    }

    .sub {
      margin: 10px 0 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.95;
    }

    /* Horizontal cards inside About (mobile) */
    .hScroll {
      margin-top: 14px;
      display: flex;
      gap: 10px;
      overflow: auto;
      padding-bottom: 6px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }

    .hScroll::-webkit-scrollbar {
      height: 6px;
    }

    .hScroll::-webkit-scrollbar-thumb {
      background: color-mix(in oklab, var(--line) 70%, transparent);
      border-radius: 999px;
    }

    .miniCard {
      flex: 0 0 86%;
      scroll-snap-align: start;
      padding: 14px;
      border-radius: var(--radius2);
      border: 1px solid var(--line);
      background: color-mix(in oklab, var(--paper) 92%, var(--soft));
    }

    [data-theme="dark"] .miniCard {
      background: rgba(255, 255, 255, .03);
    }

    .miniCard b {
      font-size: 13.5px;
    }

    .miniCard p {
      margin: 8px 0 0;
      color: var(--muted);
      font-size: 12.6px;
      line-height: 1.9;
    }

    /* Developers */
    .devList {
      display: flex;
      flex-direction: column;
      gap: 10px;
      margin-top: 12px;
    }

    .row {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 6px;
      padding: 12px 12px;
      border-radius: 14px;
      border: 1px solid var(--line);
      background: var(--paper);
    }

    [data-theme="dark"] .row {
      background: rgba(255, 255, 255, .03);
    }

    .row span {
      color: var(--muted);
      font-size: 12.6px;
    }

    .row strong {
      font-size: 13.5px;
      letter-spacing: -.2px;
    }

    /* Supporters - collapsible */
    details {
      margin-top: 12px;
      border-radius: var(--radius2);
      border: 1px solid var(--line);
      background: var(--paper);
      overflow: hidden;
    }

    [data-theme="dark"] details {
      background: rgba(255, 255, 255, .03);
    }

    summary {
      cursor: pointer;
      list-style: none;
      padding: 14px 14px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      user-select: none;
    }

    summary::-webkit-details-marker {
      display: none;
    }

    .sumLeft {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .sumTitle {
      font-weight: 900;
      font-size: 13.5px;
      letter-spacing: -.25px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .tease {
      font-size: 11.5px;
      color: var(--muted);
      border: 1px dashed color-mix(in oklab, var(--line) 70%, var(--muted));
      padding: 3px 9px;
      border-radius: 999px;
      white-space: nowrap;
    }

    .sumHint {
      font-size: 12px;
      color: var(--muted);
    }

    .chev {
      width: 18px;
      height: 18px;
      opacity: .75;
      transition: transform .18s ease;
      flex: 0 0 auto;
    }

    details[open] .chev {
      transform: rotate(180deg);
    }

    .supporters {
      padding: 2px 14px 14px;
      display: grid;
      grid-template-columns: 1fr;
      gap: 10px;
      border-top: 1px solid var(--line);
      background: color-mix(in oklab, var(--soft) 70%, var(--paper));
    }

    [data-theme="dark"] .supporters {
      background: rgba(255, 255, 255, .02);
    }

    .sup {
      padding: 11px 12px;
      border-radius: 14px;
      border: 1px solid var(--line);
      background: var(--paper);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
      font-size: 12.6px;
    }

    [data-theme="dark"] .sup {
      background: rgba(255, 255, 255, .03);
    }

    .sup em {
      font-style: normal;
      font-size: 11.5px;
      color: var(--muted);
      white-space: nowrap;
    }

    /* Bottom Nav (fixed) */
    .bottomNav {
      position: fixed;
      left: 0;
      right: 0;
      bottom: 0;
      height: var(--navH);
      background: var(--paper);
      border-top: 1px solid var(--line);
      box-shadow: 0 -10px 30px rgba(11, 13, 16, .05);
      z-index: 50;
    }

    [data-theme="dark"] .bottomNav {
      background: color-mix(in oklab, var(--paper) 92%, #000);
      box-shadow: 0 -12px 40px rgba(0, 0, 0, .45);
    }

    .navInner {
      max-width: var(--max);
      margin: 0 auto;
      height: 100%;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      padding: 8px 10px 10px;
      gap: 6px;
    }

    .navItem {
      appearance: none;
      border: none;
      background: transparent;
      cursor: pointer;
      border-radius: 14px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 5px;
      color: var(--muted);
      transition: .14s ease;
      text-decoration: none;
      padding: 6px 8px;
    }

    .navItem:hover {
      background: color-mix(in oklab, var(--soft) 70%, var(--paper));
    }

    [data-theme="dark"] .navItem:hover {
      background: rgba(255, 255, 255, .04);
    }

    .navItem svg {
      width: 20px;
      height: 20px;
      opacity: .92;
    }

    .navItem span {
      font-size: 11.5px;
      line-height: 1;
    }

    .navItem.active {
      color: var(--active);
      font-weight: 800;
    }

    /* Desktop enhancements (keeps mobile vertical by default) */
    @media (min-width: 860px) {
      .wrap {
        padding: 18px 18px 22px;
      }

      .hero {
        padding: 26px 20px;
      }

      .btnRow {
        grid-template-columns: 1fr 1fr 1fr;
      }

      .hScroll {
        overflow: visible;
      }

      .miniCard {
        flex: 1 1 0;
      }

      .navInner {
        grid-template-columns: repeat(4, 1fr);
      }

      .row {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
      }

      .supporters {
        grid-template-columns: 1fr 1fr;
      }
    }

    html {
      scroll-behavior: smooth;
    }