:root {
        --bg: #000;
        --bg-card: #0a0a0a;
        --surface: #141414;
        --surface-2: #1c1c1e;
        --border: rgba(255, 255, 255, 0.08);
        --border-soft: rgba(255, 255, 255, 0.05);
        --text-primary: #f5f5f7;
        --text-secondary: rgba(245, 245, 247, 0.6);
        --text-tertiary: rgba(245, 245, 247, 0.38);
        --accent-blue: #2997ff;
        --accent-green: #30d158;
        --accent-purple: #bf5af2;
        --accent-orange: #ff9f0a;
        --font: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
        --nav-h: 64px;
        --strip: 68px;
        --radius: 20px;
      }

      html {
        scroll-behavior: smooth;
      }

      /* body {
        font-family: var(--font);
        background: var(--bg);
        color: var(--text-primary);
        -webkit-font-smoothing: antialiased;
        overflow-x: hidden;
      } */
       .sol-section{
        background: var(--bg);
     
       }
      /* ── HEADER ─────────────────────────────────────── */
      .sol-header {
        text-align: center;
        padding: 96px 24px 56px;
        position: relative;
          background: var(--bg);    
      }

      /* radial glow behind header */
      .sol-header::before {
        content: "";
        position: absolute;
        inset: 0;
        background: radial-gradient(
          ellipse 70% 60% at 50% 0%,
          rgba(41, 151, 255, 0.12) 0%,
          transparent 70%
        );
        pointer-events: none;
      }

      .sol-header__eyebrow {
        display: inline-block;
        font-size: 13px;
        font-weight: 500;
        letter-spacing: 0.5px;
        color: var(--accent-blue);
        margin-bottom: 20px;
      }

      .sol-header h2 {
        font-size: 48px;
        font-weight: 600;
        letter-spacing: -0.03em;
        line-height: 1.08;
        color: var(--text-primary);
        margin-bottom: 20px;
      }

      .sol-header h2 span {
        background: linear-gradient(
          90deg,
          #fff 30%,
          rgba(255, 255, 255, 0.45) 100%
        );
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
      }

      .sol-header__sub {
        font-size: 22px;
        font-weight: 400;
        color: var(--text-secondary);
        max-width: 600px;
        margin: 0 auto;
        line-height: 1.65;
      }

      /* ── OUTER WRAPPER ──────────────────────────────── */
      .sol-outer {
        padding: 0 20px;
      }

      .sol-stack {
        max-width: 1100px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        gap: 0;
        padding-bottom: calc(var(--strip) * 4 + 40px);
      }

      /* ── CARD ───────────────────────────────────────── */
      .sol-card {
        position: sticky;
        border-radius: var(--radius);
        padding: 0;
        display: grid;
        grid-template-columns: 1fr 1fr;
        overflow: hidden;
        min-height: 460px;
        border: 1px solid var(--border);
        transition: border-color 0.4s;

        /* Subtle inner glow */
        box-shadow:
          0 0 0 1px var(--border-soft),
          0 32px 80px rgba(0, 0, 0, 0.6),
          inset 0 1px 0 rgba(255, 255, 255, 0.06);
      }

      .sol-card:nth-child(1) {
        z-index: 1;
        top: var(--nav-h);
      }
      .sol-card:nth-child(2) {
        z-index: 2;
        top: calc(var(--nav-h) + var(--strip));
      }
      .sol-card:nth-child(3) {
        z-index: 3;
        top: calc(var(--nav-h) + var(--strip) * 2);
      }
      .sol-card:nth-child(4) {
        z-index: 4;
        top: calc(var(--nav-h) + var(--strip) * 3);
      }

      .sol-card--school {
        background: linear-gradient(145deg, #0d1117 0%, #0d1e35 100%);
      }
      .sol-card--university {
        background: linear-gradient(145deg, #0d1117 0%, #1a120d 100%);
      }
      .sol-card--academy {
        background: linear-gradient(145deg, #0d1117 0%, #160d2a 100%);
      }
      .sol-card--corporate {
        background: linear-gradient(145deg, #0d1117 0%, #0d1e16 100%);
      }

      /* accent glow top-left corner */
      .sol-card::before {
        content: "";
        position: absolute;
        width: 400px;
        height: 400px;
        border-radius: 50%;
        pointer-events: none;
        top: -140px;
        left: -100px;
        filter: blur(80px);
        opacity: 0.18;
      }
      .sol-card--school::before {
        background: var(--accent-blue);
      }
      .sol-card--university::before {
        background: var(--accent-orange);
      }
      .sol-card--academy::before {
        background: var(--accent-purple);
      }
      .sol-card--corporate::before {
        background: var(--accent-green);
      }

      /* ── CARD LEFT ──────────────────────────────────── */
      .sol-card__text {
        padding: 48px 44px;
        display: flex;
        flex-direction: column;
        gap: 18px;
        position: relative;
        z-index: 1;
        justify-content: center;
      }

      .sol-badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        width: fit-content;
        padding: 5px 14px;
        border-radius: 999px;
        font-size: 12px;
        font-weight: 600;
        letter-spacing: 0.2px;
        border: 1px solid;
      }
      .sol-badge::before {
        content: "";
        width: 6px;
        height: 6px;
        border-radius: 50%;
      }

      .sol-card--school .sol-badge {
        color: var(--accent-blue);
        border-color: rgba(41, 151, 255, 0.3);
        background: rgba(41, 151, 255, 0.1);
      }
      .sol-card--school .sol-badge::before {
        background: var(--accent-blue);
      }
      .sol-card--university .sol-badge {
        color: var(--accent-orange);
        border-color: rgba(255, 159, 10, 0.3);
        background: rgba(255, 159, 10, 0.1);
      }
      .sol-card--university .sol-badge::before {
        background: var(--accent-orange);
      }
      .sol-card--academy .sol-badge {
        color: var(--accent-purple);
        border-color: rgba(191, 90, 242, 0.3);
        background: rgba(191, 90, 242, 0.1);
      }
      .sol-card--academy .sol-badge::before {
        background: var(--accent-purple);
      }
      .sol-card--corporate .sol-badge {
        color: var(--accent-green);
        border-color: rgba(48, 209, 88, 0.3);
        background: rgba(48, 209, 88, 0.1);
      }
      .sol-card--corporate .sol-badge::before {
        background: var(--accent-green);
      }

      .sol-card__title {
        font-size: clamp(22px, 2.2vw, 32px);
        font-weight: 700;
        letter-spacing: -0.025em;
        line-height: 1.18;
        color: var(--text-primary);
      }

      .sol-card__desc {
        font-size: 15px;
        font-weight: 400;
        line-height: 1.7;
        color: var(--text-secondary);
        max-width: 340px;
      }

      /* Feature list */
      .sol-features {
        display: flex;
        flex-direction: column;
        gap: 9px;
      }

      .sol-feature {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 13.5px;
        font-weight: 500;
        color: var(--text-secondary);
      }

      .sol-feature__dot {
        width: 5px;
        height: 5px;
        border-radius: 50%;
        flex-shrink: 0;
      }
      .sol-card--school .sol-feature__dot {
        background: var(--accent-blue);
      }
      .sol-card--university .sol-feature__dot {
        background: var(--accent-orange);
      }
      .sol-card--academy .sol-feature__dot {
        background: var(--accent-purple);
      }
      .sol-card--corporate .sol-feature__dot {
        background: var(--accent-green);
      }

      /* CTA link — Apple style */
      .sol-link {
        display: inline-flex;
        align-items: center;
        gap: 5px;
        width: fit-content;
        font-size: 15px;
        font-weight: 500;
        text-decoration: none;
        transition: gap 0.2s;
        margin-top: 4px;
      }
      .sol-link svg {
        width: 16px;
        height: 16px;
        transition: transform 0.2s;
      }
      .sol-link:hover {
        gap: 9px;
      }
      .sol-link:hover svg {
        transform: translateX(2px);
      }

      .sol-card--school .sol-link {
        color: var(--accent-blue);
      }
      .sol-card--university .sol-link {
        color: var(--accent-orange);
      }
      .sol-card--academy .sol-link {
        color: var(--accent-purple);
      }
      .sol-card--corporate .sol-link {
        color: var(--accent-green);
      }

      /* ── CARD RIGHT (visual) ────────────────────────── */
      .sol-card__visual {
        position: relative;
        overflow: hidden;
      }

      .sol-card__visual img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
        filter: brightness(0.72) saturate(0.85);
        transition:
          filter 0.5s,
          transform 0.6s;
      }

      .sol-card:hover .sol-card__visual img {
        filter: brightness(0.82) saturate(1);
        transform: scale(1.03);
      }

      /* Left fade on image */
      .sol-card__visual::before {
        content: "";
        position: absolute;
        inset: 0;
        z-index: 1;
        background: linear-gradient(90deg, var(--bg-card) 0%, transparent 40%);
        pointer-events: none;
      }

      /* Frosted glass chip */
      .sol-chip {
        position: absolute;
        z-index: 2;
        bottom: 20px;
        right: 20px;
        background: rgba(28, 28, 30, 0.72);
        backdrop-filter: blur(20px) saturate(180%);
        -webkit-backdrop-filter: blur(20px) saturate(180%);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 14px;
        padding: 14px 18px;
        min-width: 190px;
      }

      .sol-chip__label {
        font-size: 10px;
        font-weight: 600;
        letter-spacing: 0.8px;
        text-transform: uppercase;
        color: var(--text-tertiary);
        margin-bottom: 10px;
      }

      .sol-chip__items {
        list-style: none;
        display: flex;
        flex-direction: column;
        gap: 7px;
      }

      .sol-chip__items li {
        font-size: 12px;
        font-weight: 500;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        gap: 8px;
      }

      .sol-chip__items li::before {
        content: "";
        width: 4px;
        height: 4px;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.25);
        flex-shrink: 0;
      }

      /* Stat badge on image */
      .sol-stat-badge {
        position: absolute;
        z-index: 2;
        top: 20px;
        right: 20px;
        background: rgba(28, 28, 30, 0.72);
        backdrop-filter: blur(20px) saturate(180%);
        -webkit-backdrop-filter: blur(20px) saturate(180%);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 12px;
        padding: 10px 16px;
        text-align: center;
      }

      .sol-stat-badge__num {
        font-size: 22px;
        font-weight: 700;
        letter-spacing: -0.03em;
        line-height: 1;
      }
      .sol-stat-badge__sub {
        font-size: 10px;
        font-weight: 500;
        color: var(--text-tertiary);
        margin-top: 3px;
        white-space: nowrap;
      }
      .sol-card--school .sol-stat-badge__num {
        color: var(--accent-blue);
      }
      .sol-card--university .sol-stat-badge__num {
        color: var(--accent-orange);
      }
      .sol-card--academy .sol-stat-badge__num {
        color: var(--accent-purple);
      }
      .sol-card--corporate .sol-stat-badge__num {
        color: var(--accent-green);
      }

      /* ── CTA SECTION ────────────────────────────────── */
      .cta-wrap {
        max-width: 1080px;
        margin: 0 auto 100px;
        padding: 0 20px;
      }

      .cta-section {
        position: relative;
        z-index: 10;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: 28px;
        padding: 64px;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 56px;
        align-items: center;
        overflow: hidden;
        box-shadow:
          0 32px 80px rgba(0, 0, 0, 0.5),
          inset 0 1px 0 rgba(255, 255, 255, 0.06);
      }

      .cta-section::before {
        content: "";
        position: absolute;
        width: 500px;
        height: 500px;
        border-radius: 50%;
        background: radial-gradient(
          circle,
          rgba(41, 151, 255, 0.12) 0%,
          transparent 70%
        );
        top: -200px;
        left: -100px;
        pointer-events: none;
      }

      .cta-left {
        position: relative;
        z-index: 1;
      }

      .cta-left h2 {
        font-size: clamp(28px, 3vw, 42px);
        font-weight: 700;
        letter-spacing: -0.03em;
        line-height: 1.18;
        color: var(--text-primary);
        margin-bottom: 14px;
      }

      .cta-left p {
        font-size: 15px;
        color: var(--text-secondary);
        line-height: 1.7;
        margin-bottom: 32px;
      }

      .cta-btns {
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
      }

      .cta-btn-primary {
        display: inline-flex;
        align-items: center;
        gap: 7px;
        padding: 13px 26px;
        background: var(--accent-blue);
        border: none;
        border-radius: 980px;
        color: #fff;
        font: inherit;
        font-size: 14px;
        font-weight: 600;
        cursor: pointer;
        text-decoration: none;
        transition:
          background 0.18s,
          transform 0.15s;
        box-shadow: 0 0 24px rgba(41, 151, 255, 0.28);
      }
      .cta-btn-primary:hover {
        background: #1a87f0;
        transform: translateY(-1px);
      }

      .cta-btn-ghost {
        display: inline-flex;
        align-items: center;
        gap: 7px;
        padding: 13px 26px;
        background: transparent;
        border: 1px solid var(--border);
        border-radius: 980px;
        color: var(--text-primary);
        font: inherit;
        font-size: 14px;
        font-weight: 500;
        cursor: pointer;
        text-decoration: none;
        transition:
          background 0.18s,
          border-color 0.18s;
      }
      .cta-btn-ghost:hover {
        background: var(--surface-2);
        border-color: rgba(255, 255, 255, 0.18);
      }

      /* Testimonial card */
      .cta-card {
        background: var(--surface-2);
        border: 1px solid var(--border);
        border-radius: 20px;
        padding: 32px;
        position: relative;
        z-index: 1;
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
      }

      .cta-card__quote {
        font-size: 22px;
        color: var(--accent-blue);
        line-height: 1;
        margin-bottom: 12px;
        opacity: 0.6;
      }

      .cta-card h3 {
        font-size: 17px;
        font-weight: 600;
        letter-spacing: -0.015em;
        line-height: 1.4;
        color: var(--text-primary);
        margin-bottom: 12px;
      }

      .cta-card p {
        font-size: 13.5px;
        color: var(--text-secondary);
        line-height: 1.7;
        margin-bottom: 20px;
      }

      .cta-stars {
        font-size: 14px;
        letter-spacing: 2px;
        color: #f59e0b;
        margin-bottom: 18px;
      }

      .cta-card__footer {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding-top: 16px;
        border-top: 1px solid var(--border-soft);
      }

      .cta-card__author {
        font-size: 13px;
        font-weight: 600;
        color: var(--text-primary);
      }
      .cta-card__role {
        font-size: 12px;
        color: var(--text-tertiary);
        margin-top: 2px;
      }

      .cta-nav {
        display: flex;
        gap: 8px;
      }
      .cta-nav button {
        width: 32px;
        height: 32px;
        border-radius: 50%;
        border: 1px solid var(--border);
        background: transparent;
        cursor: pointer;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 14px;
        transition:
          background 0.15s,
          border-color 0.15s;
      }
      .cta-nav button:hover {
        background: var(--surface);
        border-color: rgba(255, 255, 255, 0.2);
        color: var(--text-primary);
      }

      /* ── RESPONSIVE ─────────────────────────────────── */
      @media (max-width: 1024px) {
        .sol-card {
          min-height: 400px;
        }
        .sol-card__text {
          padding: 36px 32px;
        }
        .cta-section {
          padding: 48px 40px;
        }
      }

      @media (max-width: 768px) {
        :root {
          --nav-h: 56px;
          --strip: 96px;
        }

        .sol-header {
          padding: 64px 20px 40px;
        }
        .sol-header__sub{
          font-size: 16px;
        }

        .sol-card {
          grid-template-columns: 1fr;
          min-height: unset;
          border-radius: 18px;
        }
        .sol-card__text {
          order: 1;
          padding: 28px 24px 24px;
          gap: 14px;
        }
        .sol-card__visual {
          order: 2;
          height: 220px;
        }
        .sol-card__visual::before {
          background: linear-gradient(
            180deg,
            var(--bg-card) 0%,
            transparent 40%
          );
        }
        .sol-card__title {
          font-size: 20px;
        }
        .sol-card__desc {
          font-size: 14px;
          max-width: 100%;
        }
        .sol-chip {
          min-width: 150px;
          bottom: 12px;
          right: 12px;
        }

        .cta-section {
          grid-template-columns: 1fr;
          padding: 36px 28px;
          gap: 28px;
          border-radius: 22px;
        }
      }

      @media (max-width: 480px) {
        .sol-outer,
        .cta-wrap {
          padding: 0 12px;
        }
        .sol-card__text {
          padding: 22px 18px 20px;
        }
        .sol-card__visual {
          height: 190px;
        }
        .sol-header h2 {
          font-size: 24px;
        }
        .cta-section {
          padding: 28px 20px;
        }
        .sol-features {
          gap: 7px;
        }
      }

      @media (min-width: 1440px) {
        .sol-stack,
        .cta-wrap {
          max-width: 1100px;
        }
        .sol-card {
          min-height: 500px;
        }
        .sol-card__text {
          padding: 56px 52px;
        }
        .cta-section {
          padding: 72px 80px;
        }
      }