/* Premium Dark Theme Variables */
:root {
    --bg-color: #0f0f12;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --primary-color: #6366f1;
    --primary-glow: rgba(99, 102, 241, 0.5);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --glass-blur: blur(12px);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --nav-bg: rgba(15, 15, 18, 0.8);
}

/* Light Theme Variables */
.light-mode {
    --bg-color: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-border: rgba(0, 0, 0, 0.05);
    --primary-color: #4f46e5;
    --primary-glow: rgba(79, 70, 229, 0.2);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --nav-bg: rgba(255, 255, 255, 0.85);
    --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
}

.light-mode .card {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.01em;
    margin-bottom: 2rem;
    text-align: center;
}

h3 {
    font-size: 1.5rem;
}

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

ul {
    list-style: none;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
}

.text-gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px var(--primary-glow);
    transition: var(--transition);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 0;
    z-index: 1000;
    backdrop-filter: var(--glass-blur);
    background: var(--nav-bg);
    border-bottom: 1px solid var(--card-border);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    padding: 1rem 0;
    background: var(--nav-bg);
    box-shadow: 0 4px 20px -5px rgba(0, 0, 0, 0.1);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
}

/* Active Link Indicator */
.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--card-bg);
    border-color: var(--primary-color);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding-top: 5rem;
}

.hero::before {
    content: '';
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    opacity: 0.4;
    z-index: -1;
    pointer-events: none;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    display: block;
}

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

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 2rem;
    border-radius: 16px;
    transition: var(--transition);
    height: 100%;
    backdrop-filter: blur(10px);
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.1);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Project Images */
.projects-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid var(--card-border);
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.stat-item h4 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

/* footer */
footer {
    border-top: 1px solid var(--card-border);
    padding: 4rem 0;
    margin-top: 4rem;
    background: var(--card-bg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--card-border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

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

    h2 {
        font-size: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .nav-links {
        display: none;
        /* Add toggle later if needed */
    }
}