:root { 
        --primary: #0065d8; 
        --primary-light: #4dabf7;
        --bg: #050505; 
        --text: #ffffff; 
        --card-bg: rgba(255, 255, 255, 0.03);
        --border: rgba(255, 255, 255, 0.1);
        --font: 'Space Grotesk'!important;
        --section-spacing: clamp(80px, 15vh, 180px); 
        --content-gap: clamp(40px, 5vh, 60px);       
        --grid-gap: 24px;                            
    }

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

    body { 
        font-family: var(--font) !important; 
        background-color: var(--bg); 
        color: var(--text); 
        overflow-x: hidden;
        overscroll-behavior: none;
    }

    #canvas-container {
        position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
        z-index: -1; opacity: 0.5; pointer-events: none;
    }

    main { position: relative; z-index: 1; width: 100%; }

    header {
        position: fixed; top: 0; width: 100%;
        padding: 20px 5vw;
        display: flex; justify-content: space-between; align-items: center;
        z-index: 100; mix-blend-mode: difference;
    }

    .logo-img { height: 40px; filter: brightness(100); }

    nav { display: flex; gap: 30px; }
    
    .nav-link { 
        color: #fff; text-decoration: none; text-transform: uppercase; 
        font-size: 0.8rem; letter-spacing: 1px; position: relative; 
    }

    .hamburger {
        display: none;
        background: none; border: none; cursor: pointer;
        width: 30px; height: 20px; position: relative;
        z-index: 200; 
    }

    .hamburger span {
        display: block; width: 100%; height: 2px;
        background: #fff; position: absolute;
        transition: 0.3s ease-in-out;
    }

    .hamburger span:nth-child(1) { top: 0; }
    .hamburger span:nth-child(2) { bottom: 9px; } 
    .hamburger span:nth-child(3) { bottom: 0; }

    body.nav-open .hamburger span:nth-child(1) { transform: rotate(45deg); top: 9px; }
    body.nav-open .hamburger span:nth-child(2) { opacity: 0; }
    body.nav-open .hamburger span:nth-child(3) { transform: rotate(-45deg); bottom: 9px; }

    #nav-overlay {
        position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
        background: rgba(0,0,0,0.8); backdrop-filter: blur(4px);
        z-index: 101; opacity: 0; pointer-events: none;
        transition: opacity 0.3s;
    }
    body.nav-open #nav-overlay { opacity: 1; pointer-events: auto; }

    section {
        min-height: auto; 
        padding: var(--section-spacing) 5vw;
        display: flex; flex-direction: column; justify-content: center;
        max-width: 1600px; margin: 0 auto;
    }

    #hero {
        min-height: 100vh; padding-top: 100px; padding-bottom: 0;
        justify-content: center;
    }

    h1 {
        font-size: clamp(3.5rem, 9vw, 8.5rem);
        line-height: 0.9; font-weight: 700; text-transform: uppercase;
        mix-blend-mode: overlay; opacity: 0; 
        transform: translateY(100px) skewY(10deg);
    }

    h2 {
        font-size: clamp(2.5rem, 5vw, 4.5rem);
        margin-bottom: var(--content-gap); line-height: 1;
    }

    p {
        font-size: 1.2rem; max-width: 600px; line-height: 1.6;
        color: #aaa; margin-bottom: 30px;
    }

    .btn {
        display: inline-block; padding: 15px 40px;
        border: 1px solid rgba(255,255,255,0.2); border-radius: 100px;
        color: #fff; text-decoration: none; text-transform: uppercase;
        font-size: 0.9rem; letter-spacing: 1px; transition: 0.3s;
        backdrop-filter: blur(10px);
    }
    .btn:hover { background: var(--primary); border-color: var(--primary); transform: scale(1.05); }

    .gallery-track { display: flex; gap: var(--grid-gap); width: 100%; }
    
    .gallery-item {
        flex: 1; height: 500px;
        position: relative; overflow: hidden;
        border-radius: 20px; transform-style: preserve-3d;
        will-change: transform, opacity;
    }
    .gallery-item img {
        width: 100%; height: 120%; object-fit: cover;
        position: absolute; top: -10%;
    }

    .feature-grid {
        display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: var(--grid-gap); width: 100%;
        padding: clamp(30px, 5vw, 60px);
    }

    .feature-card {
        background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
        border: 1px solid var(--border); border-radius: 30px;
        padding: clamp(30px, 5vw, 60px);
        backdrop-filter: blur(20px); width: 100%; max-width: 900px; 
    }
    .feature-card:hover { background: rgba(255,255,255,0.08); }

    .feature-icon {
        width: 48px; height: 48px; color: var(--primary);
        margin-bottom: 24px; fill: none; stroke: currentColor;
        stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
    }

    .calculator-wrapper {
        background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
        border: 1px solid var(--border); border-radius: 30px;
        padding: clamp(30px, 5vw, 60px);
        backdrop-filter: blur(20px); width: 100%; max-width: 900px; 
    }

    .calc-row {
        display: flex; justify-content: space-between; align-items: center;
        margin-bottom: 20px; 
        padding-bottom: 20px;
    }

    input {
        background: transparent; border: none; color: #fff;
        font-size: 2rem; text-align: right; font-family: var(--font); width: 200px;
    }
    input:focus { outline: none; }

    .result-big {
        font-size: clamp(3rem, 6vw, 6rem); color: var(--primary-light);
        font-weight: 700; margin-top: 10px;
    }

    footer {
        padding: 50px 5vw; border-top: 1px solid var(--border);
        display: flex; justify-content: space-between;
        color: #666; font-size: 0.9rem; margin-top: var(--section-spacing); 
    }

    @media(max-width: 768px) {
        :root { --section-spacing: 100px; }
        
        h1 { font-size: 3.5rem; }
        header { padding: 20px; }
        
        .hamburger { display: block; }
        
        .gallery-track { display: block; width: 100%; }
        .gallery-item { 
            width: 100%; height: 300px; min-height: 300px; 
            margin-bottom: 20px; transform: none !important;
        }
        .gallery-item:last-child { margin-bottom: 0; }
        
        .calc-row { flex-direction: column; align-items: flex-start; gap: 10px; }
        input { text-align: left; width: 100%; }

        nav {
            position: fixed;
            top: 0; right: 0;
            height: 100vh; width: 70%; max-width: 300px;
            background: #0a0a0a;
            display: flex; 
            flex-direction: column;
            justify-content: center;
            padding: 40px; gap: 40px;
            transform: translateX(100%);
            transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
            z-index: 102;
            border-left: 1px solid var(--border);
            box-shadow: -10px 0 30px rgba(0,0,0,0.5);
        }

        body.nav-open nav { transform: translateX(0); }

        .nav-link {
            font-size: 1.2rem;
            opacity: 0;
            transform: translateY(10px);
            transition: 0.3s;
        }

        body.nav-open .nav-link {
            opacity: 1;
            transform: translateY(0);
            transition-delay: 0.2s;
        }
    }
    nav {
        display: flex;
        align-items: center;
        gap: 32px;
    }

    .nav-link {
        display: flex;
        align-items: center;
        gap: 8px; 
        color: #e0e0e0;
        text-decoration: none;
        font-size: 0.95rem;
        font-weight: 500;
        transition: color 0.3s ease;
        padding: 5px 0;
    }

    .nav-link:hover {
        color: var(--primary-light);
    }

    .nav-icon {
        width: 20px; 
        height: 20px;
        fill: none;
        stroke: currentColor;
        stroke-width: 1.5;
        transition: stroke 0.3s;
    }

    .nav-item.has-subnav {
        position: relative;
        height: 100%;
        display: flex;
        align-items: center;
        cursor: pointer;
    }

    .subnav {
        position: absolute;
        top: 100%; 
        right: 0;  
        width: 240px;
        background: rgba(10, 10, 10, 0.95);
        backdrop-filter: blur(10px);
        border: 1px solid var(--border);
        border-radius: 16px;
        padding: 8px;
        display: flex;
        flex-direction: column;
        gap: 4px;
        opacity: 0;
        visibility: hidden;
        transform: translateY(15px);
        transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        box-shadow: 0 20px 40px rgba(0,0,0,0.4);
        z-index: 150;
    }

    .nav-item.has-subnav:hover .subnav {
        opacity: 1;
        visibility: visible;
        transform: translateY(10px); 
    }

    .subnav-link {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 10px 12px;
        color: #bbb;
        text-decoration: none;
        border-radius: 10px;
        font-size: 0.9rem;
        transition: background 0.2s, color 0.2s;
    }

    .subnav-link:hover {
        background: rgba(255,255,255,0.08);
        color: #fff;
    }

    .subnav-link .nav-icon {
        width: 18px;
        height: 18px;
        opacity: 0.7;
    }

    .subnav-link:hover .nav-icon {
        opacity: 1;
        color: var(--primary-light);
    }

    .logo2 { display: none; }
    @media(max-width: 768px) {
        nav {
            position: fixed;
            top: 0; right: 0;
            height: 100vh;
            width: 70%; max-width: 300px;
            background: #0a0a0a;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            align-items: flex-start;     
            padding: 80px 30px;          
            gap: 25px;                  
            
            transform: translateX(100%);
            transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
            z-index: 102;
            border-left: 1px solid var(--border);
            box-shadow: -10px 0 30px rgba(0,0,0,0.5);
            overflow-y: auto; 
        }

        body.nav-open nav { transform: translateX(0); }

        .nav-link {
            width: 100%;
            display: flex;
            align-items: center; 
            gap: 15px;           
            font-size: 1.1rem;   
            color: #fff;
            text-decoration: none;
            opacity: 0;
            transform: translateY(10px);
            transition: 0.3s;
            padding: 10px 0;    
        }

        .nav-link .nav-icon {
            width: 28px;  
            height: 28px;
            flex-shrink: 0;
            color: var(--primary-light); 
        }

        .nav-item.has-subnav {
            width: 100%;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .subnav {
            position: static; 
            background: transparent;
            border: none;
            box-shadow: none;
            padding-left: 15px;
            display: flex;
            flex-direction: column;
            gap: 15px;
            width: 100%;
        }

        .subnav-link {
            display: flex;
            align-items: center;
            gap: 15px;
            font-size: 1rem;
            color: #aaa;
            text-decoration: none;
        }

        .subnav-link .nav-icon {
            width: 24px;
            height: 24px;
        }

        body.nav-open .nav-link, 
        body.nav-open .subnav-link {
            opacity: 1;
            transform: translateY(0);
        }
        
        .logo2 {
            margin-top: auto; 
            padding-top: 20px;
            opacity: 0.5;
        }
        .logo2 img { height: 30px; }
    }   
    @media(max-width: 768px) {
        .nav-item.has-subnav > .nav-link {
            display: none !important;
        }

        .nav-item.has-subnav {
            width: 100%;
            display: contents; 
        }

        .subnav {
            position: static !important;
            opacity: 1 !important;
            visibility: visible !important;
            transform: none !important;
            background: transparent !important;
            border: none !important;
            box-shadow: none !important;
            width: 100% !important;
            padding: 0 !important;
            display: flex !important;
            flex-direction: column !important;
            gap: 25px !important; 
        }

        .subnav-link {
            width: 100%;
            display: flex;
            align-items: center;
            gap: 15px;
            font-size: 1.1rem !important; 
            color: #fff !important;       
            text-decoration: none;
            padding: 10px 0 !important;
            background: transparent !important;
        }

        .subnav-link .nav-icon {
             width: 28px !important;
             height: 28px !important;
             color: var(--primary-light) !important;
             opacity: 1 !important;
             flex-shrink: 0;
        }
    } 
    .logos-section {
    width: 100%;
    }

    .logo-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: var(--grid-gap);
        width: 100%;
    }

    .logo-card {
        background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
        border: 1px solid var(--border);
        border-radius: 24px;
        padding: 40px 30px;
        backdrop-filter: blur(20px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: space-between;
        text-align: center;
        transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
        min-height: 320px;
    }

    .logo-card:hover {
        background: rgba(255,255,255,0.08);
        border-color: rgba(255,255,255,0.2);
        transform: translateY(-5px);
    }

    .logo-preview {
        width: 100%;
        height: 100px;
        object-fit: contain;
        margin-bottom: 24px;
        filter: drop-shadow(0 10px 20px rgba(0,0,0,0.2));
    }

    .logo-card h3 {
        font-size: 1.2rem;
        font-weight: 500;
        margin-bottom: 20px;
        color: #fff;
        line-height: 1.4;
    }

    .logo-card a {
        display: inline-block;
        padding: 12px 30px;
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: 100px;
        color: #ccc;
        text-decoration: none;
        font-size: 0.85rem;
        text-transform: uppercase;
        letter-spacing: 1px;
        transition: 0.3s ease;
        margin-top: auto;
    }

    .logo-card a:hover {
        background: var(--primary);
        border-color: var(--primary);
        color: #fff;
    }

    .download-zip {
        text-align: center;
        align-items: center;
        margin-top: -150px !important;
        margin-bottom: -100px !important;
    }

    .btn-download-zip {
        display: inline-block;
        padding: 15px 40px;
        background: var(--primary);
        border: 1px solid var(--primary);
        border-radius: 100px;
        color: #fff;
        text-decoration: none;
        text-transform: uppercase;
        font-size: 0.9rem;
        letter-spacing: 1px;
        transition: 0.3s;
        margin-top: 20px;
    }

    .btn-download-zip:hover {
        background: transparent;
        border-color: #fff;
        transform: scale(1.05);
    }

    .centered-text {
        text-align: center;
        margin-left: auto;
        margin-right: auto;
    }

    @media(max-width: 768px) {
        .logo-grid {
            grid-template-columns: 1fr;
        }
        
        .logos-section{
          margin-top: -250px !important;
        }
        .logo-card {
            min-height: auto;
            padding: 30px;
        }
        .guidelines{
          margin-bottom: -250px !important;
        }
        main{
            margin-top: -200px !important;
        }
    }
        .guidelines{
          margin-bottom: -250px !important;
        }