:root {
        --accent: #0bff87;
        --accent2: #00b7ff;
        --glass: rgba(255, 255, 255, 0.05);
        --glass-border: rgba(11, 255, 135, 0.25);
        --bg-dark: #020c14;
        --text: #e8fff6;
        --shadow-accent: 0 0 20px rgba(11, 255, 135, 0.25);
        --font-mono: 'Space Mono', monospace;
        --font-fa: 'Vazirmatn', sans-serif;
        --nav-h: 68px;
    }

    body.light {
        --glass: rgba(255, 255, 255, 0.55);
        --glass-border: rgba(0, 163, 143, 0.35);
        --bg-dark: #e8f5f0;
        --text: #0a1a12;
        --shadow-accent: 0 0 20px rgba(0, 163, 143, 0.2);
    }

    *,
    *::before,
    *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    html {
        scroll-behavior: smooth;
    }

    body {
        font-family: var(--font-fa), sans-serif;
        background: var(--bg-dark);
        color: var(--text);
        min-height: 100vh;
        overflow-x: hidden;
        transition: background 0.4s, color 0.4s;
        animation: fadeInBody 0.8s ease forwards;
    }

    @keyframes fadeInBody {
        from {
            opacity: 0;
        }

        to {
            opacity: 1;
        }
    }

    /* ===== BACKGROUND ===== */
    .bg-wrap {
        position: fixed;
        inset: 0;
        z-index: 0;
        pointer-events: none;
    }

    .bg-gradient {
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, #000f1a 0%, #001a2e 50%, #000f1a 100%);
    }

    body.light .bg-gradient {
        background: linear-gradient(135deg, #e8f5f0 0%, #d0eee5 50%, #e8f5f0 100%);
    }

    .orb {
        position: absolute;
        border-radius: 50%;
        filter: blur(80px);
        opacity: 0.18;
    }

    .orb-1 {
        width: 500px;
        height: 500px;
        background: radial-gradient(circle, #0bff87, transparent);
        top: -100px;
        left: -150px;
        animation: float1 14s ease-in-out infinite;
    }

    .orb-2 {
        width: 400px;
        height: 400px;
        background: radial-gradient(circle, #00b7ff, transparent);
        bottom: -80px;
        right: -100px;
        animation: float2 18s ease-in-out infinite;
    }

    .orb-3 {
        width: 300px;
        height: 300px;
        background: radial-gradient(circle, #7c3aff, transparent);
        top: 40%;
        left: 50%;
        animation: float3 22s ease-in-out infinite;
    }

    @keyframes float1 {

        0%,
        100% {
            transform: translate(0, 0)
        }

        50% {
            transform: translate(30px, 40px)
        }
    }

    @keyframes float2 {

        0%,
        100% {
            transform: translate(0, 0)
        }

        50% {
            transform: translate(-25px, -35px)
        }
    }

    @keyframes float3 {

        0%,
        100% {
            transform: translate(-50%, -50%) scale(1)
        }

        50% {
            transform: translate(-50%, -50%) scale(1.15)
        }
    }

    .noise {
        position: absolute;
        inset: 0;
        opacity: 0.03;
        background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
        background-size: 200px;
    }

    /* ===== HEADER ===== */
    header {
        width: 100%;
        padding: 0 30px;
        height: var(--nav-h);
        display: flex;
        justify-content: space-between;
        align-items: center;
        background: rgba(0, 0, 0, 0.35);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--glass-border);
        position: sticky;
        top: 0;
        z-index: 100;
        transition: background 0.3s;
    }

    body.light header {
        background: rgba(255, 255, 255, 0.35);
    }

    .logo {
        width: 40px;
        height: 40px;
        position: relative;
        flex-shrink: 0;
    }

    .logo img {
        position: absolute;
        top: 0;
        left: 0;
        height: 40px;
        width: auto;
        transition: opacity 0.3s;
    }

    .logo-dark {
        opacity: 1;
    }

    .logo-light {
        opacity: 0;
    }

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

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

    .desktop-nav {
        display: flex;
        gap: 4px;
        align-items: center;
    }

    .desktop-nav a {
        font-family: var(--font-mono);
        font-size: 13px;
        color: var(--text);
        text-decoration: none;
        padding: 6px 14px;
        border-radius: 8px;
        position: relative;
        transition: color 0.2s;
        opacity: 0.75;
    }

    .desktop-nav a::after {
        content: '';
        position: absolute;
        bottom: 2px;
        left: 14px;
        right: 14px;
        height: 2px;
        background: var(--accent);
        transform: scaleX(0);
        border-radius: 2px;
        transition: transform 0.25s;
    }

    .desktop-nav a:hover {
        color: var(--accent);
        opacity: 1;
    }

    .desktop-nav a:hover::after {
        transform: scaleX(1);
    }

    .desktop-nav a.active {
        color: var(--accent);
        opacity: 1;
    }

    .desktop-nav a.active::after {
        transform: scaleX(1);
    }

    .header-right {
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .ctrl-btn {
        font-family: var(--font-mono);
        font-size: 12px;
        font-weight: 700;
        padding: 6px 14px;
        border-radius: 8px;
        cursor: pointer;
        background: rgba(255, 255, 255, 0.1);
        color: var(--text);
        border: 1px solid var(--glass-border);
        transition: all 0.2s;
        user-select: none;
    }

    .ctrl-btn:hover {
        background: var(--accent);
        color: #000;
        border-color: var(--accent);
    }

    .hamburger {
        display: none;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
        padding: 8px;
        z-index: 200;
    }

    .hamburger span {
        display: block;
        width: 24px;
        height: 2px;
        background: var(--accent);
        border-radius: 2px;
        transition: all 0.3s;
    }

    .hamburger.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

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

    .hamburger.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .mobile-drawer {
        position: fixed;
        top: 0;
        right: 0;
        width: min(300px, 80vw);
        height: 100vh;
        background: rgba(2, 12, 20, 0.97);
        backdrop-filter: blur(20px);
        z-index: 150;
        transform: translateX(100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        border-left: 1px solid var(--glass-border);
        padding: 90px 30px 30px;
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    body.light .mobile-drawer {
        background: rgba(255, 255, 255, 0.97);
    }

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

    .mobile-drawer a {
        font-family: var(--font-mono);
        font-size: 15px;
        color: var(--text);
        text-decoration: none;
        padding: 12px 16px;
        border-radius: 10px;
        transition: all 0.2s;
        border: 1px solid transparent;
        opacity: 0.75;
    }

    .mobile-drawer a:hover,
    .mobile-drawer a.active {
        background: rgba(11, 255, 135, 0.1);
        border-color: var(--glass-border);
        color: var(--accent);
        opacity: 1;
    }

    .drawer-overlay {
        position: fixed;
        inset: 0;
        z-index: 140;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.35s;
    }

    .drawer-overlay.open {
        opacity: 1;
        pointer-events: all;
    }

    /* ===== MAIN ===== */
    main {
        position: relative;
        z-index: 1;
        max-width: 1100px;
        margin: 0 auto;
        padding: 60px 24px 80px;
    }

    .page-title {
        text-align: center;
        margin-bottom: 56px;
    }

    .page-title h1 {
        font-family: var(--font-mono);
        font-size: clamp(28px, 5vw, 42px);
        font-weight: 700;
        color: var(--accent);
        letter-spacing: 2px;
        text-shadow: 0 0 30px rgba(11, 255, 135, 0.4);
    }

    /* ===== INTEREST CARDS ===== */
    .interests-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 24px;
    }

    .interest-card {
        background: var(--glass);
        border: 1px solid var(--glass-border);
        border-radius: 20px;
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        padding: 32px 28px;
        text-align: center;
        transition: transform 0.3s, box-shadow 0.3s;
        opacity: 0;
        transform: translateY(24px);
    }

    .interest-card.visible {
        opacity: 1;
        transform: translateY(0);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }

    .interest-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-accent);
    }

    .card-icon {
        font-size: 48px;
        margin-bottom: 16px;
        display: block;
        filter: drop-shadow(0 0 12px rgba(11, 255, 135, 0.3));
    }

    .interest-card h3 {
        font-family: var(--font-mono);
        font-size: 16px;
        font-weight: 700;
        color: var(--accent);
        letter-spacing: 1px;
        margin-bottom: 12px;
        text-transform: uppercase;
    }

    .interest-card p {
        font-size: 14px;
        line-height: 1.8;
        opacity: 0.78;
    }

    /* ===== FOOTER ===== */
    footer {
        position: relative;
        z-index: 1;
        text-align: center;
        padding: 24px;
        font-family: var(--font-mono);
        font-size: 12px;
        opacity: 0.4;
    }

    /* ===== RESPONSIVE ===== */
    @media (min-width: 769px) {
        .hamburger {
            display: none !important;
        }
    }

    @media (max-width: 768px) {
        .desktop-nav {
            display: none;
        }

        .hamburger {
            display: flex;
        }

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

    @media (max-width: 480px) {
        .interests-grid {
            grid-template-columns: 1fr;
        }
    }

    body[dir="rtl"] .mobile-drawer {
        left: 0;
        right: auto;
        transform: translateX(-100%);
        border-left: none;
        border-right: 1px solid var(--glass-border);
    }

    body[dir="rtl"] .mobile-drawer.open {
        transform: translateX(0);
    }