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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-background);
    min-height: 100vh;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Subtle Grid Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--color-grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px);
    background-size: 100px 100px;
    z-index: var(--z-background);
    transition: background-image var(--transition-fast);
}

/* Header */
header {
    background: var(--color-header-bg);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: var(--z-header);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--color-primary);
    letter-spacing: 1px;
}

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

.logo a:hover {
    color: var(--color-primary-dark);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* Mobile Navigation Controls */
.mobile-nav-controls {
    display: none;
    align-items: center;
    gap: 1rem;
}

/* Hamburger Menu Button */
.hamburger-menu {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: all var(--transition-fast);
}

.hamburger-line {
    width: 24px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger-menu.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.hamburger-menu.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: var(--z-header);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    display: none; /* Hide completely on desktop */
    pointer-events: none; /* Prevent interaction when hidden */
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
    display: block; /* Show only when active */
    pointer-events: auto; /* Allow interaction when active */
}

.mobile-menu {
    position: absolute;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: var(--color-header-bg);
    backdrop-filter: blur(10px);
    border-left: 1px solid var(--color-border);
    transform: translateX(100%);
    transition: transform var(--transition-fast);
    padding: 80px 2rem 2rem;
    overflow: hidden; /* Prevent content from breaking out */
}

.mobile-menu-overlay.active .mobile-menu {
    transform: translateX(0);
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 0; /* Reset margins */
    padding: 0; /* Reset padding */
}

/* Ensure mobile navigation is completely hidden on desktop */
@media (min-width: 769px) {
    .mobile-menu-overlay,
    .mobile-menu,
    .mobile-nav-links {
        display: none !important;
        visibility: hidden !important;
        opacity: 0 !important;
        pointer-events: none !important;
    }
}

.mobile-nav-links a {
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 500;
    font-size: 1.2rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
    transition: color var(--transition-fast);
}

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

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle:hover {
    background: var(--color-primary);
    color: var(--color-background);
    transform: translateY(-1px);
}

.theme-toggle .icon {
    font-size: 1.1rem;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    text-align: center;
    color: var(--color-text-primary);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, var(--color-hero-glow) 0%, transparent 70%);
    z-index: var(--z-background);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 2px;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Section Styles */
.section {
    padding: 80px 0;
    border-top: 1px solid var(--color-border);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.section-dark {
    background: var(--color-surface);
}

.section-gradient {
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-hero-glow) 100%);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--color-primary);
    letter-spacing: 1px;
}

/* Card Styles */
.card {
    background: var(--color-card-bg);
    padding: 2rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.card:hover {
    transform: translateY(-3px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-lg);
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background: var(--color-primary);
    color: var(--color-background);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-2-col {
    grid-template-columns: 2fr 1fr;
}

/* Contact Styles */
.contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-item a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-item a:hover {
    color: var(--color-text-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    /* Hide desktop navigation on mobile */
    .desktop-nav {
        display: none;
    }

    /* Show mobile navigation controls */
    .mobile-nav-controls {
        display: flex;
    }

    /* Show mobile menu overlay on mobile */
    .mobile-menu-overlay {
        display: block;
    }

    /* Adjust theme toggle for mobile */
    .theme-toggle {
        padding: 6px 10px;
        font-size: 0.9rem;
    }

    .theme-toggle #theme-text {
        display: none; /* Hide text on mobile, keep icon */
    }

    .grid-auto-fit {
        grid-template-columns: 1fr;
    }

    .grid-2-col {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    /* Prevent body scroll when menu is open */
    body.menu-open {
        overflow: hidden;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease-out;
}