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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --bg-color: #f8f9fa;
    --white: #ffffff;
    --light-gray: #ecf0f1;
    --dark-gray: #7f8c8d;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

/* Header & Navigation */
header {
    background-color: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

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

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--secondary-color);
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 200px);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 10px;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero .subtitle {
    font-size: 1.5rem;
    opacity: 0.9;
}

/* Sections */
section {
    margin-bottom: 4rem;
}

section h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

/* About Page */
.profile {
    text-align: center;
    padding: 3rem 0;
}

.profile h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.intro {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.intro p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.intro a {
    color: var(--secondary-color);
    text-decoration: none;
}

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

.strength-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.strength-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.strength-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.skill-category {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--light-gray);
}

.skill-category li:last-child {
    border-bottom: none;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--secondary-color);
}

.timeline-item {
    background: var(--white);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.5rem;
    top: 2rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--secondary-color);
    border: 3px solid var(--white);
}

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

.period {
    color: var(--dark-gray);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Portfolio Page */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.project-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.project-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.tags span {
    background: var(--light-gray);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-color);
}

/* Gallery */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.gallery-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.gallery-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Projects Page */
.projects-list {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.project-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 2rem;
    transition: transform 0.3s;
}

.project-item:hover {
    transform: translateX(10px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.project-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--secondary-color);
    min-width: 80px;
}

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

/* Forms */
.form-container {
    max-width: 500px;
    margin: 3rem auto;
    background: var(--white);
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.form-container h1 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.8rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.3s;
    width: 100%;
    text-align: center;
}

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

.contact-cta {
    text-align: center;
    padding: 3rem;
    background: var(--white);
    border-radius: 10px;
}

.contact-cta .btn {
    width: auto;
    margin-top: 1rem;
}

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

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.social-links a {
    color: var(--white);
    text-decoration: none;
    transition: opacity 0.3s;
}

.social-links a:hover {
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero .subtitle {
        font-size: 1.2rem;
    }
    
    .strength-grid,
    .skills-grid,
    .projects-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .project-item {
        flex-direction: column;
        text-align: center;
    }
}