/* ── Reset & Variables ── */
    *,
    *::before,
    *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    :root {
        --bg-start: #010b1a;
        --bg-end: #03214d;
        --accent: #0bff87;
        --accent-dim: rgba(11, 255, 135, .18);
        --glass: rgba(255, 255, 255, .05);
        --glass-border: rgba(11, 255, 135, .25);
        --text: #e8f4ff;
        --text-muted: rgba(232, 244, 255, .6);
        --header-h: 68px;
        --radius: 16px;
        --transition: .3s cubic-bezier(.4, 0, .2, 1);
    }

    body.light {
        --bg-start: #e8f0fe;
        --bg-end: #c5d8ff;
        --accent: #007a50;
        --accent-dim: rgba(0, 122, 80, .12);
        --glass: rgba(255, 255, 255, .55);
        --glass-border: rgba(0, 122, 80, .25);
        --text: #0a1628;
        --text-muted: rgba(10, 22, 40, .55);
    }

    body {
        font-family: "Vazirmatn", sans-serif;
        background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
        color: var(--text);
        min-height: 100vh;
        overflow-x: hidden;
        animation: fadeIn .7s ease both;
    }

    /* ── Noise overlay ── */
    body::before {
        content: "";
        position: fixed;
        inset: 0;
        background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.03'/%3E%3C/svg%3E");
        pointer-events: none;
        z-index: 0;
    }

    /* ── Header ── */
    header {
        position: sticky;
        top: 0;
        z-index: 100;
        height: var(--header-h);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 clamp(16px, 4vw, 40px);
        background: rgba(1, 11, 26, .65);
        backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--glass-border);
        animation: slideDown .5s .1s ease both;
    }

    body.light header {
        background: rgba(200, 220, 255, .65);
    }

    /* Logo */
    .logo {
        position: relative;
        width: 42px;
        height: 42px;
        flex-shrink: 0;
    }

    .logo img {
        position: absolute;
        inset: 0;
        width: 42px;
        height: 42px;
        object-fit: contain;
        transition: opacity .3s;
    }

    .logo .logo-dark {
        opacity: 1;
    }

    .logo .logo-light {
        opacity: 0;
    }

    body.light .logo-dark {
        opacity: 0;
    }

    body.light .logo-light {
        opacity: 1;
    }

    /* ── Desktop Nav ── */
    .desktop-nav {
        display: none;
        gap: 6px;
        list-style: none;
    }

    @media (min-width: 900px) {
        .desktop-nav {
            display: flex;
        }
    }

    .desktop-nav a {
        position: relative;
        padding: 8px 14px;
        border-radius: 10px;
        color: var(--text-muted);
        text-decoration: none;
        font-size: .9rem;
        font-weight: 600;
        letter-spacing: .03em;
        transition: color var(--transition), background var(--transition);
    }

    .desktop-nav a::after {
        content: "";
        position: absolute;
        bottom: 3px;
        left: 50%;
        transform: translateX(-50%);
        width: 0;
        height: 2px;
        background: var(--accent);
        border-radius: 2px;
        transition: width var(--transition);
    }

    .desktop-nav a:hover {
        color: var(--accent);
    }

    .desktop-nav a:hover::after {
        width: 60%;
    }

    /* ── Right Controls ── */
    .right-controls {
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .ctrl-btn {
        padding: 6px 13px;
        border: 1px solid var(--glass-border);
        border-radius: 10px;
        background: var(--glass);
        color: var(--text);
        font-family: "Space Mono", monospace;
        font-size: .78rem;
        font-weight: 700;
        cursor: pointer;
        transition: background var(--transition), border-color var(--transition), transform var(--transition);
        user-select: none;
    }

    .ctrl-btn:hover {
        background: var(--accent-dim);
        border-color: var(--accent);
        transform: translateY(-1px);
    }

    /* ── Hamburger ── */
    .hamburger {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        width: 28px;
        height: 20px;
        cursor: pointer;
        padding: 0;
        background: none;
        border: none;
        z-index: 200;
    }

    @media (min-width: 900px) {
        .hamburger {
            display: none;
        }
    }

    .hamburger span {
        display: block;
        height: 2px;
        border-radius: 2px;
        background: var(--accent);
        transition: transform .35s ease, opacity .25s ease, width .25s ease;
        transform-origin: center;
    }

    /* Active / X state */
    .hamburger.open span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .hamburger.open span:nth-child(2) {
        opacity: 0;
        transform: scaleX(0);
    }

    .hamburger.open span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

    /* ── Mobile Drawer ── */
    .mobile-drawer {
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        background: rgba(1, 11, 26, .97);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--glass-border);
        padding: 12px 20px 24px;
        display: flex;
        flex-direction: column;
        gap: 4px;
        z-index: 90;
        transform: translateY(-110%);
        transition: transform .38s cubic-bezier(.4, 0, .2, 1);
    }

    body.light .mobile-drawer {
        background: rgba(230, 240, 255, .97);
    }

    .mobile-drawer.open {
        transform: translateY(0);
    }

    .mobile-drawer a {
        display: block;
        padding: 14px 16px;
        border-radius: 12px;
        color: var(--text);
        text-decoration: none;
        font-size: 1rem;
        font-weight: 600;
        letter-spacing: .02em;
        border: 1px solid transparent;
        transition: background var(--transition), border-color var(--transition), color var(--transition), padding var(--transition);
    }

    .mobile-drawer a:hover {
        background: var(--accent-dim);
        border-color: var(--glass-border);
        color: var(--accent);
        padding-left: 24px;
    }

    @media (min-width: 900px) {
        .mobile-drawer {
            display: none !important;
        }
    }

    /* ── Hero ── */
    .hero {
        position: relative;
        z-index: 1;
        text-align: center;
        padding: clamp(70px, 12vw, 130px) clamp(20px, 6vw, 80px) clamp(60px, 10vw, 100px);
        animation: fadeInUp .7s .25s ease both;
    }

    .hero-tag {
        display: inline-block;
        font-family: "Space Mono", monospace;
        font-size: .75rem;
        letter-spacing: .15em;
        text-transform: uppercase;
        color: var(--accent);
        border: 1px solid var(--glass-border);
        border-radius: 100px;
        padding: 5px 16px;
        margin-bottom: 22px;
    }

    .hero h1 {
        font-size: clamp(2rem, 6vw, 4rem);
        font-weight: 800;
        line-height: 1.15;
        margin-bottom: 18px;
        background: linear-gradient(135deg, var(--text) 40%, var(--accent));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .hero p {
        font-size: clamp(.95rem, 2.2vw, 1.2rem);
        color: var(--text-muted);
        max-width: 580px;
        margin: 0 auto 34px;
        line-height: 1.7;
    }

    .btn {
        display: inline-block;
        padding: 13px 32px;
        background: var(--accent);
        color: #010b1a;
        border-radius: 12px;
        font-weight: 700;
        font-size: .95rem;
        text-decoration: none;
        letter-spacing: .03em;
        transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
        box-shadow: 0 0 24px rgba(11, 255, 135, .35);
    }

    .btn:hover {
        transform: translateY(-3px) scale(1.03);
        box-shadow: 0 0 40px rgba(11, 255, 135, .55);
        filter: brightness(1.08);
    }

    /* ── Glow orbs ── */
    .orb {
        position: fixed;
        border-radius: 50%;
        filter: blur(80px);
        pointer-events: none;
        z-index: 0;
        opacity: .18;
    }

    .orb-1 {
        width: 500px;
        height: 500px;
        background: var(--accent);
        top: -100px;
        left: -150px;
    }

    .orb-2 {
        width: 400px;
        height: 400px;
        background: #004e92;
        bottom: -80px;
        right: -100px;
    }

    /* ── Features ── */
    .features {
        position: relative;
        z-index: 1;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 20px;
        padding: 0 clamp(16px, 5vw, 60px) 80px;
        max-width: 1200px;
        margin: 0 auto;
    }

    .feature {
        background: var(--glass);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius);
        padding: 28px 26px;
        transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
        animation: fadeInUp .7s ease both;
    }

    .feature:nth-child(1) {
        animation-delay: .35s;
    }

    .feature:nth-child(2) {
        animation-delay: .5s;
    }

    .feature:nth-child(3) {
        animation-delay: .65s;
    }

    .feature:hover {
        transform: translateY(-8px);
        background: rgba(11, 255, 135, .08);
        box-shadow: 0 20px 50px rgba(0, 0, 0, .3), 0 0 30px rgba(11, 255, 135, .15);
    }

    .feature-icon {
        font-size: 1.8rem;
        margin-bottom: 14px;
    }

    .feature h2 {
        font-size: 1.05rem;
        font-weight: 700;
        color: var(--accent);
        margin-bottom: 10px;
        letter-spacing: .02em;
    }

    .feature p {
        font-size: .9rem;
        line-height: 1.75;
        color: var(--text-muted);
    }

    /* ── Footer ── */
    footer {
        position: relative;
        z-index: 1;
        text-align: center;
        padding: 24px;
        font-size: .82rem;
        color: var(--text-muted);
        border-top: 1px solid var(--glass-border);
        font-family: "Space Mono", monospace;
        letter-spacing: .05em;
        animation: fadeIn .7s .6s ease both;
    }

    /* ── Animations ── */
    @keyframes fadeIn {
        from {
            opacity: 0;
        }

        to {
            opacity: 1;
        }
    }

    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(28px);
        }

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

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-20px);
        }

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