:root {
    --primary-dark: #0A0E1A;
    --primary: #1A2340;
    --primary-light: #2E3D6B;
    --accent: #6B8FC8;
    --accent-light: #8BA8E0;
    --accent-hover: #5A7FB8;
    --background: #FFFFFF;
    --surface: #F0F4F8;
    --text-primary: #1A1A1A;
    --text-secondary: #4A5568;
    --border: #D1D9E6;

    /* Mapped variables for compatibility */
    --bg-color: var(--background);
    --text-color: var(--text-primary);
    --card-bg: var(--surface);
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --primary-color: var(--accent);
    --secondary-color: var(--text-secondary);
    --accent-color: var(--accent);
    --border-color: var(--border);
    --nav-bg: var(--background);
    --nav-border: var(--border);
    --footer-bg: var(--surface);
    --footer-text: var(--text-secondary);
}

.dark-mode {
    /* Dark Mode Variables */
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --card-bg: #1e1e1e;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --primary-color: #90caf9;
    --secondary-color: #b0bec5;
    --accent-color: #81c784;
    --border-color: #333333;
    --nav-bg: #1e1e1e;
    --nav-border: #333333;
    --footer-bg: #121212;
    --footer-text: #b0bec5;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

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

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.theme-toggle:hover {
    background-color: rgba(128, 128, 128, 0.1);
}

/* Main Content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

/* Categories & Grid */
.category-section {
    margin-bottom: 3rem;
}

.category-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* Project Cards */
.project-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 180px;
    position: relative;
    border: 1px solid var(--border-color);
}

.project-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.category-label {
    display: inline-block;
    font-size: 0.8rem;
    padding: 0.2rem 0.6rem;
    background-color: rgba(128, 128, 128, 0.1);
    border-radius: 12px;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.status-badge {
    margin-top: auto;
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Completed State */
.project-card.completed {
    cursor: pointer;
    border-left: 4px solid var(--accent-color);
}

.project-card.completed:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.project-card.completed .status-badge {
    color: var(--accent-color);
}

/* Coming Soon State */
.project-card.coming-soon {
    opacity: 0.6;
    cursor: not-allowed;
    background-color: rgba(128, 128, 128, 0.05);
    border-left: 4px solid var(--secondary-color);
}

.project-card.coming-soon .status-badge {
    color: var(--secondary-color);
}

/* Progress Tracker */
.progress-tracker {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    z-index: 100;
    border: 1px solid var(--border-color);
    min-width: 200px;
}

.progress-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.progress-label {
    font-weight: 600;
    font-size: 0.9rem;
}

#progress-count {
    font-size: 0.9rem;
    color: var(--secondary-color);
    align-self: flex-end;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 0.5s ease;
}

/* Footer */
.footer {
    background-color: var(--footer-bg);
    padding: 2rem 0;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--footer-text);
}

.footer-content a {
    color: var(--footer-text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .progress-tracker {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        width: auto;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}