/* =================================================================
   Simple & Professional Portfolio Stylesheet
   By Ahmed Elhag (v2.13 - Final)
================================================================= */

/* 1. Variables & Base Styles */
:root {
    --primary-color: #3a86ff;
    --accent-color: #ff914d;
    --dark-bg: #121212;
    --dark-bg-secondary: #1e1e1e;
    --text-primary: #f0f2f5;
    --text-secondary: #a8b2c1;
    --border-color: #30363d;
    --font-heading: 'Tajawal', sans-serif;
    --font-body: 'Tajawal', sans-serif;
    --radius: 8px;
    --transition: 0.3s ease;
    --container-width: 1200px;
    --spacing-unit: 1rem;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { 
    font-size: 16px; 
    scroll-behavior: smooth; 
    overflow-x: hidden; 
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { 
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0066ff;
        --accent-color: #ff6600;
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --border-color: #666666;
    }
}

/* Skip to main content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 6px;
}

body::-webkit-scrollbar { width: 10px; }
body::-webkit-scrollbar-track { background: var(--dark-bg); }
body::-webkit-scrollbar-thumb { background-color: var(--border-color); border-radius: 10px; }
body::-webkit-scrollbar-thumb:hover { background-color: var(--primary-color); }

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--dark-bg);
}

.container { width: 100%; max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }
main { display: flex; flex-direction: column; padding-top: 70px; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 700; line-height: 1.2; color: var(--text-primary); }
p { color: var(--text-secondary); margin-bottom: var(--spacing-unit); }
a { color: var(--primary-color); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-color); }
img { 
    max-width: 100%; 
    height: auto; 
    display: block; 
}

/* Performance optimizations for images */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* Focus indicators for better accessibility */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Ensure minimum touch target size */
.nav-link,
.btn,
.social-link,
.back-to-top {
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
ul { list-style: none; }

/* 2. Reusable Components */
.section { padding: 80px 0; }
.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 24px; border-radius: var(--radius); font-weight: 700; text-align: center; transition: all var(--transition); border: none; cursor: pointer; font-size: 0.9rem; }
.btn-primary { background-color: var(--primary-color); color: white; }
.btn-primary:hover { background-color: var(--accent-color); color: white; }

/* 3. Header & Navigation */
.header { position: fixed; top: 0; left: 0; width: 100%; z-index: 100; background-color: rgba(18, 18, 18, 0.8); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-color); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo a { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 700; color: var(--text-primary); }
.logo a:hover { color: var(--primary-color); }
.nav-menu { display: flex; gap: 2rem; }
.nav-link { font-weight: 500; color: var(--text-secondary); }
.nav-link:hover, .nav-link.active { color: var(--text-primary); }
.nav-toggle { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.8rem; cursor: pointer; }

/* 4. Hero Section */
.hero { min-height: 100vh; display: flex; align-items: center; text-align: center; padding: 80px 0; background: linear-gradient(180deg, rgba(18, 18, 18, 0.6) 0%, var(--dark-bg) 100%); }
.hero .container { display: flex; flex-direction: column; align-items: center; gap: 2rem; }
.hero h1 { font-size: 4rem; color: var(--primary-color); margin-bottom: 0.5rem; }
.hero p { font-size: 1.5rem; color: var(--text-primary); margin-bottom: 2rem; }
.hero .typing { color: var(--accent-color); min-height: 2.2rem; }
.hero .typing::after { content: '|'; animation: blink 0.7s infinite; }
@keyframes blink { 50% { opacity: 0; } }
.social-links { display: flex; gap: 1.5rem; }
.social-link { display: flex; align-items: center; justify-content: center; color: var(--text-secondary); font-size: 1.2rem; transition: color var(--transition); }
.social-link:hover { color: var(--primary-color); }
.scroll-down-indicator { width: 24px; height: 40px; border: 2px solid var(--text-secondary); border-radius: 50px; opacity: 0.7; position: relative; margin-top: 1rem; }
.scroll-down-indicator::before { content: ''; position: absolute; top: 8px; left: 50%; transform: translateX(-50%); width: 4px; height: 8px; background: var(--text-secondary); border-radius: 4px; animation: scroll-anim 2s infinite; }
@keyframes scroll-anim { 0% { transform: translate(-50%, 0); opacity: 1; } 100% { transform: translate(-50%, 15px); opacity: 0; } }

/* 5. About & Skills Sections */
.about-grid { display: grid; grid-template-columns: 1fr 2fr; align-items: center; gap: 3rem; }
.about-image img { border-radius: 50%; box-shadow: 0 0 30px rgba(58, 134, 255, 0.2); }
.about-text .section-title { text-align: left; }

.skills-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}
.skill-item {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}
.skill-item i { font-size: 2.8rem; color: var(--primary-color); transition: color var(--transition); }
.skill-item span {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity var(--transition);
}
.skill-item:hover i { color: var(--accent-color); }
.skill-item:hover span { opacity: 1; }

/* 6. Resume Sections */
/* 7. Cards (Projects, Certificates) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.card {
    background-color: var(--dark-bg-secondary);
    border-radius: var(--radius);
    display: flex; flex-direction: column;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

/* Project Card - Overlay Style */
.project-card { position: relative; padding: 0; display: block; }
.project-card .card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.project-card:hover .card-image { transform: scale(1.05); }
.project-card .card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 1.5rem;
    opacity: 0;
    transition: opacity var(--transition);
}
.project-card:hover .card-overlay { opacity: 1; }
.project-card .card-title { color: white; transform: translateY(10px); transition: transform 0.4s ease; }
.project-card:hover .card-title { transform: translateY(0); }
.project-card .card-overlay-icon {
    position: absolute;
    bottom: 1.5rem;
    right: 1.5rem;
    font-size: 1.5rem;
    color: var(--primary-color);
    transform: translateX(-10px);
    transition: transform 0.4s ease;
}
.project-card:hover .card-overlay-icon { transform: translateX(0); }

/* Certificate Card - Horizontal Style */
.certificate-card { flex-direction: row; align-items: center; padding: 1rem; gap: 1rem; }
.certificate-card:hover { box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2); border-color: var(--primary-color); }
.cert-logo-container { flex-shrink: 0; width: 50px; height: 50px; background-color: var(--dark-bg); border-radius: 50%; display: flex; align-items: center; justify-content: center; padding: 5px; }
.cert-logo { max-width: 100%; max-height: 100%; object-fit: contain; }
.cert-info { display: flex; justify-content: space-between; align-items: center; flex-grow: 1; gap: 1rem; }
.cert-info .card-title { font-size: 1.1rem; margin: 0; color: var(--text-primary); }
.cert-info .card-provider { font-size: 0.9rem; color: var(--text-secondary); margin: 0; }
.cert-info .card-btn {
    flex-shrink: 0; width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%; border: 1px solid var(--border-color); color: var(--text-secondary);
    transition: all var(--transition);
}
.cert-info .card-btn:hover { background-color: var(--primary-color); color: white; border-color: var(--primary-color); }

/* 8. Footer */
.footer { background-color: var(--dark-bg-secondary); padding: 2rem 0; text-align: center; border-top: 1px solid var(--border-color); }
.footer .social-links { justify-content: center; margin-bottom: 1.5rem; }
.copyright { color: var(--text-secondary); font-size: 0.9rem; margin: 0; }
/* 9. Back to Top Button */
.back-to-top { position: fixed; bottom: 25px; right: 25px; width: 40px; height: 40px; background: var(--dark-bg-secondary); color: var(--text-primary); border: 1px solid var(--border-color); border-radius: var(--radius); cursor: pointer; font-size: 0.9rem; opacity: 0; visibility: hidden; z-index: 1000; display: flex; align-items: center; justify-content: center; transition: all var(--transition); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3); }
.back-to-top.active { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--primary-color); color: white; border-color: var(--primary-color); }

/* 10. Responsive Design */
@keyframes dropdown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 768px) {
    .section { padding: 60px 0; }
    .hero h1 { font-size: 3rem; }
    .hero p { font-size: 1.2rem; }
    .about-grid { grid-template-columns: 1fr; text-align: center; }
    .about-text .section-title { text-align: center; }
    .nav-toggle { display: block; }
    .nav-menu { display: none; position: absolute; top: 70px; right: 20px; background-color: rgba(30, 30, 30, 0.85); backdrop-filter: blur(10px); border: 1px solid var(--border-color); border-radius: var(--radius); min-width: 180px; flex-direction: column; gap: 0; padding: 0.5rem 0; }
    .nav-menu.active { display: flex; animation: dropdown 0.3s ease; }
    .nav-link { display: block; padding: 0.75rem 1.5rem; }
}

/* Responsive adjustments for skills grid */
@media (min-width: 576px) {
    .skills-list {
        grid-template-columns: repeat(4, 1fr);
    }
}
/* 11. Timeline Design for Experience & Education */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 3px;
    background-color: var(--primary-color);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1.5px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -11.5px;
    background-color: var(--dark-bg);
    border: 3px solid var(--primary-color);
    top: 25px;
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.left { left: 0; }
.timeline-item.right { left: 50%; }
.timeline-item.right::after { left: -8.5px; }

.timeline-content {
    padding: 20px;
    background-color: var(--dark-bg-secondary);
    position: relative;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.timeline-content h3 {
    margin-top: 0;
    font-size: 1.2rem;
    color: var(--primary-color);
}

.timeline-content h4 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.timeline-content p { margin: 5px 0 0; font-size: 0.9rem; color: var(--text-secondary); }
.timeline-content p i { margin-right: 8px; color: var(--accent-color); }

/* Responsive Timeline */
@media screen and (max-width: 768px) {
    .about-image img { max-width: 250px; margin: 0 auto; }
    .timeline::after { left: 20px; }
    .timeline-item {
        width: 100%;
        padding-left: 50px;
        padding-right: 15px;
    }
    .timeline-item.left, .timeline-item.right { left: 0%; }
    .timeline-item.left::after, .timeline-item.right::after { left: 10px; }
            }