/* Base styles and CSS variables */
:root {
    --primary-color: #4f46e5;
    --secondary-color: #6b7280;
    --background-color: #ffffff;
    --text-color: #1f2937;
    --card-bg: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --success-color: #10b981;
    --error-color: #ef4444;
    --header-height: 4rem;
    --transition-speed: 0.3s;
    --input-bg: #ffffff;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --container-width: 1200px;
    --container-padding: 1rem;
    --section-spacing: 4rem;
    --card-border-radius: 1rem;
    --button-border-radius: 0.5rem;
}

/* Dark theme variables */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #9ca3af;
    --background-color: #111827;
    --text-color: #e5e7eb;
    --card-bg: #1f2937;
    --border-color: #374151;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --input-bg: #1f2937;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--background-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

/* Navigation */
.navbar {
    height: var(--header-height);
    background-color: var(--background-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo h1 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--primary-color);
}

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

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

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

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

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed);
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-color);
    opacity: 0.9;
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn-large {
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
}

/* Hero Section */
.hero {
    padding: calc(var(--header-height) + 3rem) 0 5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1d4ed8 100%);
    color: white;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Features Section */
.features {
    padding: 5rem 0;
    background-color: var(--background-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    padding: 2rem;
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    text-align: center;
    transition: transform var(--transition-speed);
}

.feature-card:hover {
    transform: translateY(-5px);
}

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

/* Categories Section */
.categories {
    padding: 5rem 0;
    background-color: var(--card-bg);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.category-card {
    padding: 2rem;
    background-color: var(--background-color);
    border-radius: 0.5rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 6px var(--shadow-color);
}

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

/* Footer */
.footer {
    background-color: var(--card-bg);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.footer-section a:hover {
    color: var(--primary-color);
}

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

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    transition: color var(--transition-speed);
}

.theme-toggle:hover {
    color: var(--primary-color);
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    width: 25px;
    height: 2px;
    background-color: var(--text-color);
    transition: all var(--transition-speed);
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--background-color);
        padding: 1rem;
        flex-direction: column;
        align-items: stretch;
        box-shadow: 0 2px 4px var(--shadow-color);
    }

    .nav-links.active {
        display: flex;
    }

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

    .hero p {
        font-size: 1rem;
    }

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

    .feature-grid,
    .category-grid {
        grid-template-columns: 1fr;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn var(--transition-speed);
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--text-color);
    font-size: 1.5rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--card-bg);
}

.social-links a:hover {
    transform: translateY(-2px);
}

.social-links a:hover i.fa-linkedin {
    color: #0077b5;
}

.social-links a:hover i.fa-github {
    color: #333;
}

.social-links a:hover i.fa-whatsapp {
    color: #25D366;
}

.social-links a:hover i.fa-medium {
    color: #000000;
}

.social-links a:hover i.fa-instagram {
    color: #E4405F;
}

/* Dark theme adjustments for social links */
[data-theme="dark"] .social-links a {
    background: var(--background-color);
}

[data-theme="dark"] .social-links a:hover i.fa-github {
    color: #ffffff;
}

[data-theme="dark"] .social-links a:hover i.fa-medium {
    color: #ffffff;
}