:root {
    /* Theme: Ocean Night */
    --primary: #2B4C7E;
    --primary-dark: #1B325F;
    --background: #0A192F;
    --surface: #172A45;
    --text: #FFFFFF;
    --text-secondary: #CCD6F6;
    --accent: #64FFDA;
    --nav-bg: rgba(11, 25, 47, 0.95);
    --radius: 1.25rem;
    --gradient-light: linear-gradient(135deg, #172A45 0%, #1B325F 100%);
    --shadow-soft: 0 20px 40px rgba(10, 25, 47, 0.3);
    --accent-soft: #64FFDA;
    --accent-muted: rgba(100, 255, 218, 0.1);
    
    /* Theme-specific Variables */
    --glow-effect: 0 0 15px rgba(100, 255, 218, 0.1);
    --card-border: 1px solid rgba(100, 255, 218, 0.2);
    --hover-transform: translateY(-5px);
    --gradient-accent: linear-gradient(135deg, #64FFDA 0%, #3CAEA3 100%);
    --text-gradient: linear-gradient(135deg, #E6F1FF 0%, #8892B0 100%);
    
    /* Additional Theme Colors */
    --highlight: #FF5E5B;
    --secondary-accent: #5D5DFF;
    --success: #3CAEA3;
    --warning: #FFB347;

    /* Enhanced Background Patterns */
    --bg-pattern-dots: radial-gradient(circle at 1px 1px, rgba(100, 255, 218, 0.15) 1px, transparent 0);
    --bg-pattern-grid: linear-gradient(rgba(100, 255, 218, 0.1) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(100, 255, 218, 0.1) 1px, transparent 1px);
    --bg-pattern-waves: repeating-linear-gradient(
        135deg,
        var(--background) 0px,
        var(--background) 10px,
        rgba(100, 255, 218, 0.05) 10px,
        rgba(100, 255, 218, 0.05) 11px
    );
    --bg-pattern-soft: radial-gradient(
        circle at 50% 50%,
        rgba(93, 93, 255, 0.15) 0%,
        transparent 60%
    ), var(--gradient-light);
    
    /* New Patterns */
    --bg-noise: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)' opacity='0.05'/%3E%3C/svg%3E");
    --bg-circuit: linear-gradient(rgba(100, 255, 218, 0.05) 2px, transparent 2px),
                 linear-gradient(90deg, rgba(100, 255, 218, 0.05) 2px, transparent 2px),
                 linear-gradient(rgba(100, 255, 218, 0.05) 1px, transparent 1px),
                 linear-gradient(90deg, rgba(100, 255, 218, 0.05) 1px, transparent 1px);
    --bg-glow: radial-gradient(circle at 50% 0%, rgba(93, 93, 255, 0.15), transparent 75%);
}

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

body {
    margin: 0;
    min-height: 100vh;
    background: var(--background);
    background-image: var(--bg-grid), var(--bg-noise);
    background-attachment: fixed;
    background-size: 50px 50px, 200px 200px;
    color: var(--text);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-y: overlay;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

body::-webkit-scrollbar {
    display: none;
}


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

body {
    background: var(--background);
    background-image: var(--bg-circuit), var(--bg-glow), var(--bg-noise);
    background-attachment: fixed;
    background-size: 50px 50px, 100% 100%, 200px 200px;
    margin: 0;
    padding: 0;
    position: relative;
    overflow-x: hidden;
    color: var(--text);
    font-family: 'Inter', sans-serif;
}
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0.4rem 2rem;
    background: var(--nav-bg);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
    box-shadow: 0 2px 20px rgba(10, 25, 47, 0.3);
    z-index: 1000;
}

.nav_logo {
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 2em;
    font-weight: 700;
    letter-spacing: -0.5px;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #80a9e6 0%, var(--secondary-accent) 90%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav_logo:hover {
    transform: scale(1.02);
    color: var(--accent);   
}

.nav_buttons {
    display: flex;
    gap: 0.8rem;
    align-items: center;
    margin-left: auto;
    padding: 0.3rem;
    border-radius: 0.75rem;
}

.nav_items {
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1.2rem;
    border-radius: var(--radius);
    border: 1px solid transparent;
    background: transparent;
}

.nav_items a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
}

.nav_items:hover {
    background: var(--surface);
    transform: translateY(-1px);
    border: 1px solid var(--accent-muted);
}

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

.back-btn {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    padding: 0.7rem 1.4rem;
    border-radius: var(--radius);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.back-btn:hover {
    color: var(--accent-soft);
    background: var(--accent-muted);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.1);
    border-color: var(--accent-soft);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 2rem 2rem;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
}

.header h1 {
    font-size: 3.2rem;
    font-weight: 800;
    margin-bottom: 1.2rem;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--secondary-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: all 0.6s ease;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.3rem;
    font-weight: 500;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

.card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--accent);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    background: linear-gradient(to bottom, var(--surface), var(--primary-dark)),
                var(--bg-pattern-grid);
    background-size: 100% 100%, 30px 30px;
}

.card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: 0 15px 40px rgba(100, 255, 218, 0.1);
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 2px solid var(--accent-muted);
    display: inline-block;
    color: var(--primary);
    font-weight: 700;
    letter-spacing: -0.5px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 50%;
    height: 2px;
    background: var(--accent-soft);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-item {
    padding: 1.5rem;
    background: var(--surface);
    font-family: "Inter";
    border-radius: var(--radius);
    border: 1px solid var(--accent);
    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    background: linear-gradient(to bottom, var(--surface), var(--primary-dark)),
                var(--bg-pattern-grid);
    background-size: 100% 100%, 30px 30px;
}

.feature-item:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: 0 8px 24px rgba(31, 78, 67, 0.15);
}

.feature-item h3 {
    color: var(--accent);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 3px rgba(100, 255, 218, 0.1);
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

.badge {
    background: rgba(100, 255, 218, 0.1);
    color: var(--accent);
    padding: 0.4em 1em;
    border-radius: 0.5rem;
    font-size: 0.9em;
    font-weight: 600;
    border: 1px solid rgba(100, 255, 218, 0.2);
    transition: all 0.3s ease;
    text-shadow: 0 0 5px rgba(100, 255, 218, 0.1);
}

@media (max-width: 768px) {
    .navbar {
        padding: 0.8rem 1.5rem;
    }

    .container {
        padding: 5rem 1rem 1rem;
    }
    
    .header h1 {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.1rem;
        padding: 0 1rem;
    }
    
    .card {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    .section-title {
        font-size: 1.6rem;
        margin-bottom: 2rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .feature-item {
        padding: 1.4rem;
    }

    .feature-item h3 {
        font-size: 1.1rem;
    }

    .badge {
        padding: 0.3em 0.8em;
        font-size: 0.85em;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0.6rem 1rem;
    }

    .container {
        padding: 4.5rem 0.8rem 1rem;
    }

    .header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .feature-item {
        padding: 1.2rem;
    }

    .feature-item p {
        font-size: 0.9rem;
    }
}