/* Base Styles and CSS Variables */
:root {
    /* Light Theme Colors */
    --primary-light: #4f46e5;
    --secondary-light: #818cf8;
    --background-light: #ffffff;
    --surface-light: #f3f4f6;
    --text-primary-light: #111827;
    --text-secondary-light: #4b5563;
    --border-light: #e5e7eb;

    /* Dark Theme Colors */
    --primary-dark: #818cf8;
    --secondary-dark: #4f46e5;
    --background-dark: #111827;
    --surface-dark: #1f2937;
    --text-primary-dark: #f9fafb;
    --text-secondary-dark: #d1d5db;
    --border-dark: #374151;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.5;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Theme Styles */
body.light-mode {
    background-color: var(--background-light);
    color: var(--text-primary-light);
}

body.dark-mode {
    background-color: var(--background-dark);
    color: var(--text-primary-dark);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--background-light);
    border-bottom: 1px solid var(--border-light);
    transition: background-color var(--transition-normal);
}

.dark-mode .navbar {
    background-color: var(--background-dark);
    border-bottom-color: var(--border-dark);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: inherit;
    font-weight: 600;
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary-light);
    transition: color var(--transition-fast);
}

.dark-mode .nav-links a {
    color: var(--text-secondary-dark);
}

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

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

/* Auth Section */
.auth-section {
    display: flex;
    align-items: center;
}

.login-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--primary-light);
    color: white;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.dark-mode .login-btn {
    background-color: var(--primary-dark);
}

.login-btn:hover {
    background-color: var(--secondary-light);
}

.dark-mode .login-btn:hover {
    background-color: var(--secondary-dark);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-profile img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.user-profile.hidden {
    display: none;
}

/* Hero Section */
.hero {
    padding: calc(var(--spacing-xl) * 3) var(--spacing-md);
    text-align: center;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    color: white;
}

.dark-mode .hero {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
}

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

.hero-subtitle {
    margin-top: var(--spacing-md);
    font-size: 1.25rem;
    opacity: 0.9;
}

.cta-buttons {
    margin-top: var(--spacing-xl);
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.cta-primary,
.cta-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    transition: transform var(--transition-fast);
}

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

.cta-secondary {
    border: 2px solid white;
    color: white;
}

.cta-primary:hover,
.cta-secondary:hover {
    transform: translateY(-2px);
}

/* Tools Grid */
.tools-grid {
    padding: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.tools-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.tool-card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    background-color: var(--surface-light);
    border: 1px solid var(--border-light);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.dark-mode .tool-card {
    background-color: var(--surface-dark);
    border-color: var(--border-dark);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.dark-mode .tool-card:hover {
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.tool-card i {
    font-size: 2rem;
    color: var(--primary-light);
    margin-bottom: var(--spacing-md);
}

.dark-mode .tool-card i {
    color: var(--primary-dark);
}

.tool-card h3 {
    margin-bottom: var(--spacing-sm);
}

.tool-card p {
    color: var(--text-secondary-light);
    margin-bottom: var(--spacing-lg);
}

.dark-mode .tool-card p {
    color: var(--text-secondary-dark);
}

.tool-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--primary-light);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.dark-mode .tool-link {
    background-color: var(--primary-dark);
}

.tool-link:hover {
    background-color: var(--secondary-light);
}

.dark-mode .tool-link:hover {
    background-color: var(--secondary-dark);
}

/* Features Section */
.features {
    padding: var(--spacing-xl);
    background-color: var(--surface-light);
}

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

.features-grid {
    max-width: 1200px;
    margin: var(--spacing-xl) auto 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-light);
    margin-bottom: var(--spacing-md);
}

.dark-mode .feature-card i {
    color: var(--primary-dark);
}

/* Testimonials */
.testimonials {
    padding: var(--spacing-xl);
    text-align: center;
}

.testimonials-grid {
    max-width: 1200px;
    margin: var(--spacing-xl) auto 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.testimonial-card {
    padding: var(--spacing-xl);
    background-color: var(--surface-light);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.dark-mode .testimonial-card {
    background-color: var(--surface-dark);
    border-color: var(--border-dark);
}

.testimonial-card img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
}

.testimonial-card p {
    font-style: italic;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary-light);
}

.dark-mode .testimonial-card p {
    color: var(--text-secondary-dark);
}

/* Footer */
.footer {
    background-color: var(--surface-light);
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-xl) var(--spacing-md);
}

.dark-mode .footer {
    background-color: var(--surface-dark);
    border-top-color: var(--border-dark);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.footer-section h3 {
    margin-bottom: var(--spacing-md);
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

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

.dark-mode .footer-section a {
    color: var(--text-secondary-dark);
}

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

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

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    font-size: 1.5rem;
}

.footer-bottom {
    max-width: 1200px;
    margin: var(--spacing-xl) auto 0;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-light);
    text-align: center;
    color: var(--text-secondary-light);
}

.dark-mode .footer-bottom {
    border-top-color: var(--border-dark);
    color: var(--text-secondary-dark);
}

/* Loading Spinner */
.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-spinner.hidden {
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-light);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

.dark-mode .spinner {
    border-color: #2d2d2d;
    border-top-color: var(--primary-dark);
}

.loading-text {
    color: white;
    font-size: 1.2rem;
    font-weight: 500;
    text-align: center;
    font-family: 'Inter', sans-serif;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: inherit;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--background-light);
        padding: var(--spacing-md);
        flex-direction: column;
        align-items: stretch;
        border-bottom: 1px solid var(--border-light);
    }

    .dark-mode .nav-links {
        background-color: var(--background-dark);
        border-bottom-color: var(--border-dark);
    }

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

    .mobile-menu-btn {
        display: block;
    }

    .hero {
        padding: calc(var(--spacing-xl) * 2) var(--spacing-md);
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .tools-container {
        grid-template-columns: 1fr;
    }

    .features-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}