/* 
    DESIGN SYSTEM & GLOBAL STYLES
    Dual-Track Portfolio Architecture
    Ahmed Elaraby - Expert Full Stack & ML Engineer
*/

:root {
    /* Colors - Core */
    --bg-dark: #050505;
    --bg-card: rgba(255, 255, 255, 0.03);
    --border-glass: rgba(255, 255, 255, 0.1);
    
    /* Track 1: Full Stack (Cyan/Blue) */
    --fs-accent: #00f2ff;
    --fs-accent-rgb: 0, 242, 255;
    --fs-gradient: linear-gradient(135deg, #00f2ff 0%, #0072ff 100%);
    
    /* Track 2: Machine Learning (Pink/Purple) */
    --ml-accent: #ff00ea;
    --ml-accent-rgb: 255, 0, 234;
    --ml-gradient: linear-gradient(135deg, #ff00ea 0%, #ae00ff 100%);
    
    /* Neutral */
    --text-main: #ffffff;
    --text-dim: #b0b0b0;
    --white: #ffffff;
    
    /* Animations */
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
    --transition-smooth: 0.6s var(--ease-out-expo);
    
    /* Layout */
    --nav-height: 80px;
    --container-max: 1200px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    border: 2px solid var(--bg-dark);
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.1;
}

.mono {
    font-family: 'JetBrains Mono', monospace;
}

/* Custom Cursor */
.custom-cursor {
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    mix-blend-mode: difference;
    transition: transform 0.3s var(--ease-out-expo), width 0.3s, height 0.3s, background 0.3s;
    transform: translate(-50%, -50%);
}

.custom-cursor.hovering {
    transform: translate(-50%, -50%) scale(3);
}

.custom-cursor.code::after {
    content: '</>';
    font-size: 5px;
    color: black;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: bold;
}

.custom-cursor.data::after {
    content: '...';
    font-size: 10px;
    color: black;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: bold;
}

/* Glassmorphism Classes */
.glass {
    background: var(--bg-card);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--border-glass);
}

/* Magnetic Button Base */
.magnetic-wrap {
    display: inline-block;
    position: relative;
    padding: 20px;
}

.magnetic-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s cubic-bezier(0.23, 1, 0.32, 1);
    cursor: pointer;
    border: none;
    outline: none;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--white);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.nav-links a:hover {
    color: var(--white);
}

/* Track Switcher */
.track-switcher {
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    padding: 4px;
    border-radius: 30px;
    border: 1px solid var(--border-glass);
}

.switcher-btn {
    padding: 6px 16px;
    border-radius: 25px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-dim);
    transition: all 0.3s;
}

.switcher-btn.active.fs {
    background: var(--fs-accent);
    color: #000;
}

.switcher-btn.active.ml {
    background: var(--ml-accent);
    color: #000;
}

/* Preloader */
.preloader {
    position: fixed;
    inset: 0;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 1s var(--ease-out-expo);
}

.preloader.hidden {
    opacity: 0;
    pointer-events: none;
}

.preloader-name {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 5px;
    text-transform: uppercase;
    color: #fff;
    filter: drop-shadow(0 0 10px #fff);
    animation: glow 2s infinite alternate;
}

@keyframes glow {
    from {
        opacity: 0.5;
        filter: drop-shadow(0 0 5px #fff);
    }
    to {
        opacity: 1;
        filter: drop-shadow(0 0 30px #fff);
    }
}

/* Footer & Global Sections */
.section {
    padding: 100px 5%;
    max-width: var(--container-max);
    margin: 0 auto;
}

.footer {
    padding: 50px 5%;
    text-align: center;
    border-top: 1px solid var(--border-glass);
    color: var(--text-dim);
    font-size: 0.9rem;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    z-index: 1001;
    padding: 10px;
}

.bar {
    width: 25px;
    height: 2px;
    background: var(--white);
    transition: var(--transition-smooth);
}

/* Modal System */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.9);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s var(--ease-out-expo);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    width: 90%;
    max-width: 800px;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 30px;
    padding: 50px;
    position: relative;
    transform: translateY(30px);
    transition: transform 0.6s var(--ease-out-expo);
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.close-modal {
    position: absolute;
    top: 30px;
    right: 30px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-dim);
    transition: color 0.3s;
}

.close-modal:hover { color: var(--white); }

/* Responsive Fixes */
@media (max-width: 1024px) {
    .custom-cursor {
        display: none !important;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    .nav-links {
        position: fixed;
        right: -100%;
        top: 0;
        width: 80%;
        height: 100vh;
        background: var(--bg-dark);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.6s var(--ease-out-expo);
        border-left: 1px solid var(--border-glass);
    }
    .nav-links.active {
        right: 0;
    }
    .track-switcher {
        display: none;
    }
}

/* Utility: Viewport Height Fix */
.vh-100 {
    height: 100vh;
    height: 100dvh;
}