/* ==================== DESIGN TOKENS ==================== */
:root {
    /* Colors */
    --primary: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --accent: #0ea5e9;
    --accent-light: #38bdf8;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border: #475569;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-sans: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-mono: 'Courier New', monospace;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

/* ==================== TYPOGRAPHY ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.5px;
}

h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--accent-light);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent);
}

/* ==================== CONTAINER & UTILITIES ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-title {
    text-align: center;
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-3xl);
}

/* ==================== NAVIGATION ==================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-light);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-light), var(--accent-light));
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--accent-light);
    border-radius: 2px;
    transition: var(--transition);
}

/* ==================== HERO SECTION ==================== */
.hero {
    margin-top: 80px;
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.1), rgba(14, 165, 233, 0.1));
    border-bottom: 1px solid var(--border);
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hero-text h1 {
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 4rem;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--accent-light);
    margin-bottom: var(--spacing-md);
}

.tagline {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    color: white;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.4);
}

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

.btn-secondary:hover {
    background-color: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

.hero-image {
    text-align: center;
    animation: float 3s ease-in-out infinite;
}

.profile-img {
    width: 100%;
    max-width: 400px;
    border-radius: var(--radius-lg);
    border: 3px solid var(--primary-light);
    box-shadow: 0 20px 60px rgba(30, 64, 175, 0.3);
    object-fit: cover;
}

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

/* ==================== ABOUT SECTION ==================== */
.about {
    padding: var(--spacing-3xl) 0;
    background-color: var(--surface);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ==================== SKILLS SECTION ==================== */
.skills {
    padding: var(--spacing-3xl) 0;
    background-color: var(--background);
}

.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

.skills-column h3 {
    color: var(--accent-light);
    margin-bottom: var(--spacing-lg);
    font-size: 1.5rem;
}

.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.skill-item {
    flex: 0 0 auto;
}

.skill-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.2), rgba(14, 165, 233, 0.2));
    color: var(--accent-light);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--primary-light);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    cursor: default;
}

.skill-badge:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    color: white;
    border-color: var(--accent-light);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
}

/* ==================== EXPERIENCE SECTION ==================== */
.experience {
    padding: var(--spacing-3xl) 0;
    background-color: var(--surface);
}

.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.experience-card {
    background-color: var(--background);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.experience-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-light), var(--accent-light));
}

.experience-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.2);
    transform: translateY(-5px);
}

.card-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-light);
    opacity: 0.2;
    margin-bottom: var(--spacing-md);
}

.experience-card h3 {
    color: var(--accent-light);
    margin-bottom: var(--spacing-sm);
}

.card-type {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.experience-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==================== CONTACT SECTION ==================== */
.contact {
    padding: var(--spacing-3xl) 0;
    background-color: var(--background);
}

.contact-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-3xl);
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-card {
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.1), rgba(14, 165, 233, 0.1));
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--primary-light);
    text-align: center;
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--accent-light);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.2);
    transform: translateY(-5px);
}

.contact-card h3 {
    color: var(--accent-light);
    margin-bottom: var(--spacing-md);
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.small-text {
    font-size: 0.9rem;
    color: var(--text-tertiary) !important;
}

.contact-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    color: white;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition);
}

.contact-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
}

/* ==================== FOOTER ==================== */
.footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-tertiary);
    font-size: 0.95rem;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .nav-menu {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .nav-menu.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--surface);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--border);
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .profile-img {
        max-width: 250px;
    }

    .skills-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .experience-grid {
        grid-template-columns: 1fr;
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero {
        margin-top: 70px;
        padding: var(--spacing-lg) 0;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .profile-img {
        max-width: 200px;
    }

    .skill-badge {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85rem;
    }

    .card-number {
        font-size: 2rem;
    }
}