:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --primary-color: #818cf8;
    --primary-dark: #6366f1;
    --secondary-color: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --bg-primary: #1e293b;
    --bg-secondary: #0f172a;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.5);
    --gradient-primary: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
    --gradient-secondary: linear-gradient(135deg, #f472b6 0%, #fb7185 100%);
    --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
}

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

/* Smooth theme transition */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Enhanced theme transition effects */
html {
    transition: background-color 0.4s ease;
}

body {
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Improved focus states for accessibility */
.theme-toggle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.view-button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Theme transition animation */
@keyframes themeChange {
    0% { opacity: 1; }
    50% { opacity: 0.8; }
    100% { opacity: 1; }
}

.theme-changing {
    animation: themeChange 0.4s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    position: relative;
    text-align: center;
    padding: 4rem 0 3rem;
    background: var(--bg-primary);
    margin: 2rem 0;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.main-title{
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    /* color: var(--text-primary); */
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    margin: 2
}

.header-content {
    position: relative;
    z-index: 1;
}



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

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
}

.header-decoration {
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 100px;
    background: var(--gradient-accent);
    border-radius: 50%;
    opacity: 0.1;
    filter: blur(40px);
}

/* Theme Toggle */
.theme-toggle {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 50px;
    height: 50px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.theme-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.theme-toggle.rotating .theme-icon {
    transform: rotate(180deg);
}

/* Projects Grid */
.projects-container {
    flex: 1;
    padding: 2rem 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

/* Project Card Styles */
.project-card {
    background: var(--bg-primary);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.project-card:hover::before {
    transform: scaleX(1);
}

.card-header {
    padding: 2rem;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
}

/* Dark mode card header */
[data-theme="dark"] .card-header {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    text-transform: capitalize;
}

.card-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.card-content {
    padding: 1.5rem 2rem;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

/* Dark mode tag styling */
[data-theme="dark"] .tag {
    background: var(--border-color);
    color: var(--text-secondary);
}

.tag {
    background: var(--secondary-color);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.card-footer {
    padding: 0 2rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.view-button {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.view-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.project-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #10b981;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
    }
    
    .header {
        margin: 1rem 0;
        padding: 2rem 1rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .card-header,
    .card-content,
    .card-footer {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .card-header,
    .card-content {
        padding: 1rem;
    }
    
    .card-footer {
        padding: 0 1rem 1rem;
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card {
    animation: fadeInUp 0.6s ease forwards;
}

.project-card:nth-child(2) { animation-delay: 0.1s; }
.project-card:nth-child(3) { animation-delay: 0.2s; }
.project-card:nth-child(4) { animation-delay: 0.3s; }
.project-card:nth-child(5) { animation-delay: 0.4s; }
.project-card:nth-child(6) { animation-delay: 0.5s; }