:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-bg: #ecf0f1;
    --dark-text: #2c3e50;
    --card-radius: 15px;
    --transition: all 0.3s ease;
}

/* Base Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: white;
    scroll-behavior: smooth;
}

/* Navbar */
.navbar {
    background: rgba(44, 62, 80, 0.95);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-link {
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--secondary-color) !important;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    text-align: left;
    padding-top: 80px;
}

.hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="3" fill="rgba(255,255,255,0.08)"/><circle cx="40" cy="60" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="90" cy="80" r="2" fill="rgba(255,255,255,0.06)"/><circle cx="10" cy="90" r="3" fill="rgba(255,255,255,0.08)"/></svg>');
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.4rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
    animation: fadeInUp 1s ease 0.3s both;
}

.hero-description {
    font-size: 1.05rem;
    opacity: 0.85;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease 0.6s both;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Buttons */
.btn-custom {
    background: var(--accent-color);
    border: none;
    padding: 12px 28px;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    color: white;
}

.btn-custom:hover {
    background: #c0392b;
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(231, 76, 60, 0.4);
}

/* Section Titles */
.section-title {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 70px;
    height: 4px;
    background: var(--secondary-color);
    border-radius: 2px;
}

/* About Section */
.about-section {
    padding: 100px 0;
    background: var(--light-bg);
}

.skill-item {
    background: white;
    padding: 2rem;
    border-radius: var(--card-radius);
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: var(--transition);
    margin-bottom: 2rem;
}

.skill-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

.skill-icon {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Projects Section */
.projects-section {
    padding: 100px 0;
    background: white;
}

.project-card {
    background: white;
    border-radius: var(--card-radius);
    overflow: hidden;
    box-shadow: 0 6px 25px rgba(0,0,0,0.08);
    transition: var(--transition);
    margin-bottom: 2rem;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 35px rgba(0,0,0,0.12);
}

.project-image {
    height: 230px;
    background: linear-gradient(45deg, var(--secondary-color), var(--primary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.project-content {
    padding: 1.8rem;
}

.project-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

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

.tech-tag {
    background: var(--light-bg);
    color: var(--primary-color);
    padding: 0.35rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Contact Section */
.contact-section {
    background: var(--primary-color);
    color: white;
    padding: 100px 0;
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.contact-item i {
    font-size: 1.5rem;
    margin-right: 1rem;
    color: var(--secondary-color);
}

/* Footer */
.footer {
    background: #1a252f;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

.social-links a {
    color: white;
    font-size: 1.4rem;
    margin: 0 0.7rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--secondary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title { font-size: 2.3rem; }
    .hero-subtitle { font-size: 1.1rem; }
    .section-title h2 { font-size: 2rem; }
}