:root {
    /* Light Theme (Default) */
    --primary: #8B5CF6; /* Violet */
    --primary-hover: #7C3AED;
    --bg-main: #FFFFFF;
    --bg-alt: #F5F3FF;
    --text-main: #1F2937;
    --text-muted: #4B5563;
    --card-bg: #FFFFFF;
    --card-border: #EDE9FE;
    --nav-bg: rgba(255, 255, 255, 0.9);
    --shadow: 0 10px 15px -3px rgba(139, 92, 246, 0.1);
    --badge-bg: #EDE9FE;
    --badge-text: #8B5CF6;
}

[data-theme="dark"] {
    --bg-main: #0F172A;
    --bg-alt: #1E293B;
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --card-bg: #1E293B;
    --card-border: #334155;
    --nav-bg: rgba(15, 23, 42, 0.9);
    --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    --badge-bg: rgba(139, 92, 246, 0.2);
    --badge-text: #A78BFA;
}

* { margin: 0; padding: 0; box-sizing: border-box; scroll-behavior: smooth; user-select: none; }
body { font-family: 'Outfit', sans-serif; color: var(--text-main); background: var(--bg-main); line-height: 1.6; transition: 0.3s; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 3000;
    padding: 20px 0; background: var(--nav-bg);
    backdrop-filter: blur(10px); border-bottom: 1px solid var(--card-border);
}
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.nav-links { display: flex; list-style: none; gap: 30px; }
.nav-links a { text-decoration: none; color: var(--text-main); font-weight: 500; }

.btn { padding: 12px 32px; border-radius: 50px; font-weight: 600; cursor: pointer; text-decoration: none; border: none; transition: 0.3s; }
.btn-primary { background: linear-gradient(135deg, var(--primary) 0%, #6366F1 100%); color: white; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(139, 92, 246, 0.3); }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); }
.btn-lg { padding: 16px 40px; font-size: 1.1rem; }

.hero { padding: 180px 0 100px; background: radial-gradient(circle at 10% 20%, rgba(139, 92, 246, 0.05) 0%, transparent 40%); }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 60px; }
.hero-content h1 { font-size: 4rem; line-height: 1.1; margin-bottom: 24px; color: var(--text-main); }
.badge { display: inline-block; padding: 6px 16px; background: var(--badge-bg); color: var(--badge-text); border-radius: 50px; font-size: 0.9rem; font-weight: 600; margin-bottom: 20px; }
.hero-btns { display: flex; gap: 20px; margin-top: 40px; }
.hero-image img { width: 100%; border-radius: 30px; box-shadow: 0 20px 50px rgba(139, 92, 246, 0.15); border: 2px solid var(--card-bg); }

.features { padding: 100px 0; background: var(--bg-alt); }
.section-header { text-align: center; margin-bottom: 60px; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.feature-card { background: var(--card-bg); padding: 40px; border-radius: 24px; border: 1px solid var(--card-border); transition: 0.3s; }
.feature-card:hover { transform: translateY(-5px); border-color: var(--primary); box-shadow: var(--shadow); }
.learn-card i { color: var(--accent); width: 48px; height: 48px; margin-bottom: 25px; }
.learn-card h3 { font-size: 1.6rem; margin-bottom: 15px; }

footer { padding: 50px 0; text-align: center; border-top: 1px solid var(--card-border); color: var(--text-muted); }
.nav-actions { display: flex; align-items: center; gap: 15px; }
.btn-theme { background: var(--card-bg); border: 1px solid var(--card-border); color: var(--text-main); width: 40px; height: 40px; border-radius: 12px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: 0.3s; }
.btn-theme:hover { color: var(--primary); border-color: var(--primary); }

.mobile-toggle { display: none; cursor: pointer; color: var(--text-main); }

@media (max-width: 968px) {
    h1 { font-size: 2.8rem; }
    .mobile-toggle { 
        display: block; 
        z-index: 3100;
        color: var(--text-main);
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--bg-main);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        padding: 40px;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 3005;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
        display: flex;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links a {
        font-size: 1.5rem;
        padding: 15px;
        display: block;
        color: var(--text-main);
    }
}

.menu-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 2500;
}

.menu-backdrop.active {
    opacity: 1;
    visibility: visible;
}

body.menu-open {
    overflow: hidden;
}