:root {
    --primary-color: #1e3a8a; /* Navy Blue */
    --primary-light: #2c52b5;
    --accent-color: #fbbf24; /* Gold */
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --text-color: #334155;
    --text-light: #f1f5f9;
    --card-bg: #ffffff;
    --transition: all 0.3s ease;
    --font-main: 'Cairo', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--light-bg);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.3;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
    color: var(--primary-color);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.accent-text {
    color: var(--accent-color);
    display: block;
    margin-top: 5px;
    font-size: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 2rem;
    border-radius: 8px;
    font-weight: 700;
    transition: var(--transition);
    cursor: pointer;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--primary-color);
    border: 2px solid var(--accent-color);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--accent-color);
}

.btn-outline {
    background-color: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-outline:hover {
    background-color: #fff;
    color: var(--primary-color);
}

.btn-sm {
    padding: 0.5rem 1.5rem;
    font-size: 0.9rem;
}

/* Sections */
.section {
    padding: 5rem 0;
}

/* Hero Section */
.hero-section {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-align: center;
    background-color: var(--primary-color);
    background-image: 
        linear-gradient(rgba(15, 23, 42, 0.9), rgba(30, 58, 138, 0.85)), 
        url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23fbbf24' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    /* The SVG is a subtle abstract tech pattern */
}

.hero-content {
    z-index: 2;
    position: relative;
}

.hero-buttons {
    margin-top: 2.5rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Grid System */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Value Cards */
.card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    text-align: center;
    transition: var(--transition);
    border: 1px solid #e2e8f0;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    border-bottom: 4px solid var(--accent-color);
}

.icon-box {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

/* Portfolio Cards */
.project-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: var(--transition);
    border: 1px solid #e2e8f0;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.project-card .card-content {
    padding: 2rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.project-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.project-card p {
    color: #64748b;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--primary-color);
    top: 0;
    bottom: 0;
    right: 20px; /* RTL alignment */
    border-radius: 2px;
}

.timeline-item {
    padding: 10px 60px 10px 10px;
    position: relative;
    background-color: inherit;
    width: 100%;
    margin-bottom: 2rem;
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    right: 12px;
    background-color: var(--accent-color);
    border: 4px solid #fff;
    top: 15px;
    border-radius: 50%;
    z-index: 1;
    box-shadow: 0 0 0 4px rgba(251, 191, 36, 0.2);
}

.timeline-content {
    padding: 1.5rem;
    background-color: white;
    position: relative;
    border-radius: 8px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    border-right: 4px solid var(--primary-color);
}

.timeline-date {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* Skills Tags */
.skills-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-top: 3rem;
}

.skill-tag {
    background-color: white;
    color: var(--primary-color);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
    border: 1px solid #e2e8f0;
}

/* Contact */
.contact-cards {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.contact-card:hover {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transition: opacity 1s ease-out;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.visible {
    opacity: 1;
    transform: none;
}

/* Delays */
.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }

/* Responsive */
@media screen and (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    .hero-section { height: auto; padding: 6rem 0; }
    
    .timeline::after { right: 15px; }
    .timeline-dot { right: 7px; }
    .timeline-item { padding-right: 45px; }
}