/* SIDI landing page v2.0.0 — renewed 2026-05-22 */
    :root {
      color-scheme: dark;
      --bg: #080a17;
      --bg-2: #0e1227;
      --surface: rgba(19, 24, 50, .78);
      --surface-strong: rgba(27, 34, 70, .92);
      --surface-soft: rgba(255,255,255,.06);
      --text: #f7f8ff;
      --muted: #c8d0ee;
      --muted-2: #97a3ca;
      --line: rgba(128, 184, 255, .26);
      --line-strong: rgba(228, 68, 214, .48);
      --blue: #24a8ff;
      --cyan: #2ee4ff;
      --magenta: #e637c9;
      --violet: #8657ff;
      --yellow: #f6e768;
      --yellow-2: #fff4a9;
      --danger: #ff51d1;
      --radius-sm: 14px;
      --radius: 22px;
      --radius-lg: 32px;
      --shadow: 0 24px 80px rgba(0,0,0,.42);
      --container: min(1160px, calc(100% - 32px));
      --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, "Noto Sans", sans-serif;
    }

    * { box-sizing: border-box; }

    html { scroll-behavior: smooth; }

    body {
      margin: 0;
      font-family: var(--font);
      color: var(--text);
      background:
        radial-gradient(circle at 18% 2%, rgba(230,55,201,.24), transparent 28rem),
        radial-gradient(circle at 88% 14%, rgba(36,168,255,.22), transparent 32rem),
        linear-gradient(180deg, #080a17 0%, #0b1025 48%, #070914 100%);
      line-height: 1.55;
      overflow-x: hidden;
    }

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

    a { color: inherit; }

    a:focus-visible,
    button:focus-visible {
      outline: 3px solid var(--yellow);
      outline-offset: 4px;
    }

    .skip-link {
      position: absolute;
      left: 16px;
      top: 12px;
      z-index: 20;
      transform: translateY(-160%);
      padding: 10px 14px;
      color: #101426;
      background: var(--yellow);
      border-radius: 999px;
      font-weight: 800;
      transition: transform .18s ease;
    }

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

    .container { width: var(--container); margin-inline: auto; }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 10;
      background: rgba(8,10,23,.76);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(255,255,255,.08);
    }

    .header-inner {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      min-width: 150px;
      text-decoration: none;
    }

    .brand img { width: 168px; height: auto; }

    .nav-links {
      display: none;
      align-items: center;
      gap: 22px;
      color: var(--muted);
      font-size: .94rem;
      font-weight: 700;
    }

    .nav-links a {
      text-decoration: none;
      opacity: .92;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      min-height: 48px;
      padding: 13px 20px;
      border-radius: 999px;
      text-decoration: none;
      font-weight: 900;
      letter-spacing: .01em;
      border: 1px solid transparent;
      transition: transform .18s ease, background .18s ease, border-color .18s ease;
    }

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

    .btn-primary {
      color: #101426;
      background: linear-gradient(135deg, var(--yellow), var(--yellow-2));
      box-shadow: 0 14px 36px rgba(246,231,104,.2);
    }

    .btn-secondary {
      color: var(--text);
      background: rgba(255,255,255,.08);
      border-color: rgba(255,255,255,.18);
    }

    .section {
      padding: 68px 0;
      position: relative;
    }

    .section-tight { padding: 48px 0; }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin: 0 0 16px;
      color: var(--yellow);
      text-transform: uppercase;
      letter-spacing: .13em;
      font-size: .78rem;
      font-weight: 900;
    }

    .eyebrow::before {
      content: "";
      width: 10px;
      height: 10px;
      border-radius: 999px;
      background: linear-gradient(135deg, var(--cyan), var(--magenta));
      box-shadow: 0 0 0 6px rgba(46,228,255,.12);
    }

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

    h1 {
      max-width: 760px;
      margin-bottom: 18px;
      font-size: clamp(2.35rem, 8.5vw, 5.9rem);
      line-height: .92;
      letter-spacing: -.065em;
    }

    h2 {
      margin-bottom: 18px;
      font-size: clamp(2rem, 5.2vw, 3.65rem);
      line-height: .98;
      letter-spacing: -.045em;
    }

    h3 {
      margin-bottom: 10px;
      font-size: clamp(1.16rem, 2.4vw, 1.42rem);
      line-height: 1.16;
    }

    .lead {
      color: var(--muted);
      font-size: clamp(1.03rem, 2vw, 1.24rem);
      line-height: 1.58;
    }

    .hero {
      padding: 44px 0 72px;
      min-height: calc(100svh - 72px);
      display: grid;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      gap: 28px;
      align-items: center;
    }

    .hero-copy {
      position: relative;
      z-index: 2;
    }

    .hero-subtitle {
      margin-bottom: 18px;
      color: var(--text);
      font-size: clamp(1.28rem, 3vw, 2.15rem);
      line-height: 1.15;
      font-weight: 850;
    }

    .hero-description {
      max-width: 680px;
      margin-bottom: 24px;
      color: var(--muted);
      font-size: 1.06rem;
    }

    .hook {
      margin: 0 0 24px;
      padding: 18px 18px 18px 20px;
      border-left: 5px solid var(--magenta);
      border-radius: var(--radius-sm);
      background: rgba(255,255,255,.06);
      color: var(--text);
      font-size: 1.08rem;
      font-weight: 760;
    }

    .hook strong { color: var(--yellow); white-space: nowrap; }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      margin-bottom: 16px;
    }

    .gift-note {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      max-width: 620px;
      margin: 0;
      padding: 12px 14px;
      border: 1px solid rgba(46,228,255,.36);
      border-radius: 999px;
      background: rgba(46,228,255,.09);
      color: #eafcff;
      font-weight: 820;
      font-size: .95rem;
    }

    .gift-note::before { content: "🎁"; }

    .hero-media {
      position: relative;
      isolation: isolate;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: #11162f;
      border: 1px solid rgba(255,255,255,.12);
      box-shadow: var(--shadow);
      aspect-ratio: 1 / .82;
    }

    .hero-media::before,
    .hero-media::after {
      content: "";
      position: absolute;
      inset: auto;
      z-index: -1;
      border-radius: 999px;
      filter: blur(20px);
      opacity: .7;
    }

    .hero-media::before {
      width: 46%;
      height: 44%;
      right: -16%;
      top: -10%;
      background: var(--magenta);
    }

    .hero-media::after {
      width: 48%;
      height: 48%;
      left: -14%;
      bottom: -18%;
      background: var(--blue);
    }

    .hero-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .stats-row {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
      margin-top: 18px;
    }

    .stat {
      padding: 14px;
      border-radius: 18px;
      background: rgba(255,255,255,.065);
      border: 1px solid rgba(255,255,255,.1);
    }

    .stat strong {
      display: block;
      color: var(--yellow);
      font-size: 1.35rem;
      line-height: 1;
    }

    .stat span {
      color: var(--muted);
      font-size: .86rem;
      font-weight: 700;
    }

    .intro-card {
      display: grid;
      gap: 20px;
      padding: clamp(24px, 5vw, 44px);
      border: 1px solid rgba(255,255,255,.1);
      border-radius: var(--radius-lg);
      background:
        linear-gradient(135deg, rgba(36,168,255,.14), rgba(230,55,201,.08)),
        rgba(255,255,255,.045);
      box-shadow: var(--shadow);
    }

    .learning-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin-top: 26px;
      padding: 0;
      list-style: none;
    }

    .learning-card,
    .usp-card,
    .lecture-card,
    .testimonial-card {
      border: 1px solid var(--line);
      background: var(--surface);
      box-shadow: 0 14px 42px rgba(0,0,0,.2);
      backdrop-filter: blur(18px);
    }

    .learning-card {
      display: flex;
      align-items: center;
      gap: 14px;
      padding: 16px;
      border-radius: 18px;
      min-height: 92px;
      color: var(--text);
      font-weight: 820;
    }

    .icon-bubble {
      flex: 0 0 auto;
      width: 46px;
      height: 46px;
      display: grid;
      place-items: center;
      border-radius: 16px;
      background: rgba(36,168,255,.14);
      color: var(--yellow);
      border: 1px solid rgba(46,228,255,.28);
      font-size: 1.4rem;
    }

    .section-head {
      display: grid;
      gap: 10px;
      max-width: 920px;
      margin-bottom: 28px;
    }

    .usp-grid {
      display: grid;
      gap: 16px;
      padding: 0;
      list-style: none;
    }

    .usp-card {
      padding: 22px;
      border-radius: var(--radius);
    }

    .usp-card strong {
      display: block;
      margin-bottom: 8px;
      color: var(--text);
      font-size: 1.08rem;
    }

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

    .program {
      background:
        radial-gradient(circle at 50% 0%, rgba(134,87,255,.16), transparent 28rem),
        rgba(255,255,255,.02);
    }

    .program-grid {
      display: grid;
      gap: 18px;
    }

    .lecture-card {
      display: grid;
      gap: 18px;
      padding: 20px;
      border-radius: var(--radius);
    }

    .lecture-card.featured { border-color: var(--line-strong); }

    .lecture-top {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 14px;
      align-items: start;
    }

    .lecture-number {
      width: 48px;
      height: 48px;
      display: grid;
      place-items: center;
      border-radius: 16px;
      background: linear-gradient(135deg, rgba(36,168,255,.9), rgba(230,55,201,.82));
      color: #fff;
      font-weight: 950;
    }

    .lecture-topic {
      margin: 0;
      color: var(--text);
    }

    .teacher {
      display: grid;
      grid-template-columns: 76px 1fr;
      gap: 14px;
      align-items: center;
      padding: 12px;
      border-radius: 18px;
      background: rgba(255,255,255,.055);
      border: 1px solid rgba(255,255,255,.1);
    }

    .teacher img,
    .teacher-placeholder {
      width: 76px;
      height: 76px;
      border-radius: 18px;
      object-fit: cover;
      border: 2px solid rgba(255,255,255,.22);
    }

    .teacher-placeholder {
      display: grid;
      place-items: center;
      background: linear-gradient(135deg, rgba(36,168,255,.18), rgba(230,55,201,.18));
      font-size: 2rem;
    }

    .teacher-name {
      display: block;
      margin-bottom: 4px;
      color: var(--yellow);
      font-weight: 900;
    }

    .teacher-role {
      margin: 0;
      color: var(--muted);
      font-size: .94rem;
      line-height: 1.35;
    }

    .lecture-points {
      display: grid;
      gap: 8px;
      margin: 0;
      padding: 0;
      list-style: none;
      color: var(--muted);
    }

    .lecture-points li {
      position: relative;
      padding-left: 24px;
    }

    .lecture-points li::before {
      content: "";
      position: absolute;
      left: 0;
      top: .66em;
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: var(--cyan);
      box-shadow: 0 0 0 5px rgba(46,228,255,.09);
    }

    .testimonials-grid {
      display: grid;
      gap: 16px;
    }

    .testimonial-card {
      padding: 24px;
      border-radius: var(--radius);
    }

    .testimonial-card blockquote {
      margin: 0;
      color: var(--muted);
      font-size: 1.02rem;
    }

    .testimonial-card blockquote::before {
      content: "“";
      display: block;
      color: var(--yellow);
      font-size: 3rem;
      line-height: .65;
      font-weight: 900;
    }

    .testimonial-card cite {
      display: block;
      margin-top: 16px;
      color: var(--text);
      font-style: normal;
      font-weight: 900;
    }

    .final-cta {
      padding: 34px;
      border-radius: var(--radius-lg);
      text-align: center;
      background:
        linear-gradient(135deg, rgba(36,168,255,.18), rgba(230,55,201,.18)),
        var(--surface-strong);
      border: 1px solid rgba(255,255,255,.14);
      box-shadow: var(--shadow);
    }

    .price {
      display: inline-flex;
      align-items: baseline;
      gap: 8px;
      margin: 4px 0 22px;
      color: var(--yellow);
      font-size: clamp(2.15rem, 7vw, 4rem);
      font-weight: 950;
      letter-spacing: -.04em;
    }

    .price small {
      color: var(--muted);
      font-size: 1rem;
      font-weight: 800;
      letter-spacing: 0;
    }

    .footer {
      padding: 28px 0 40px;
      color: var(--muted-2);
      border-top: 1px solid rgba(255,255,255,.08);
      font-size: .92rem;
    }

    .footer-inner {
      display: grid;
      gap: 10px;
      align-items: center;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .footer a { color: var(--muted); }

    @media (min-width: 680px) {
      .learning-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
      .usp-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .testimonials-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
      .lecture-card { grid-template-columns: 1.05fr .95fr; }
      .lecture-points { align-content: start; }
    }

    @media (min-width: 860px) {
      .nav-links { display: flex; }
      .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(380px, .88fr); gap: 42px; }
      .hero-media { aspect-ratio: .95 / 1; min-height: 560px; }
      .intro-card { grid-template-columns: .75fr 1.25fr; align-items: start; }
      .footer-inner { grid-template-columns: 1fr auto; }
    }

    @media (min-width: 1100px) {
      .program-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .lecture-card { min-height: 100%; }
    }

    @media (max-width: 479px) {
      :root { --container: min(100% - 24px, 1160px); }
      .site-header .btn { padding-inline: 14px; min-height: 44px; font-size: .92rem; }
      .brand img { width: 132px; }
      .hero { padding-top: 30px; }
      .hero-actions .btn { width: 100%; }
      .gift-note { border-radius: 18px; align-items: flex-start; }
      .stats-row { grid-template-columns: 1fr; }
      .learning-grid { grid-template-columns: 1fr; }
      .teacher { grid-template-columns: 64px 1fr; }
      .teacher img, .teacher-placeholder { width: 64px; height: 64px; border-radius: 16px; }
      .final-cta { padding: 24px 18px; }
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
    }