/* CSS Variables for Light and Dark Themes */
:root {
    /* Light theme colors */
    --bg-color: #e8e9eb;
    --text-color: #333333;
    --card-bg: #f5f6f7;
    --card-border: #d0d1d3;
    --header-bg: #e8e8e8;
    --button-bg: #333333;
    --button-text: #ffffff;
    --active-button-bg: #cccccc;
    --active-button-text: #333333;
    --shadow: rgba(0, 0, 0, 0.15);
    --card-gradient: linear-gradient(135deg, #f5f6f7 0%, #e8e9eb 100%);
    --card-hover-gradient: linear-gradient(135deg, #ffffff 0%, #f0f2f5 100%);
    --accent-color: #4a90e2;
    --success-color: #28a745;
    --warning-color: #ffc107;
}

[data-theme="dark"] {
    /* Dark theme colors */
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --card-bg: #2a2a2a;
    --card-border: #404040;
    --header-bg: #333333;
    --button-bg: #ffffff;
    --button-text: #000000;
    --active-button-bg: #555555;
    --active-button-text: #ffffff;
    --shadow: rgba(0, 0, 0, 0.3);
    --card-gradient: linear-gradient(135deg, #2a2a2a 0%, #1f1f1f 100%);
    --card-hover-gradient: linear-gradient(135deg, #333333 0%, #2a2a2a 100%);
    --accent-color: #64b5f6;
    --success-color: #4caf50;
    --warning-color: #ffb74d;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Top Controls */
.top-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--card-border);
    background-color: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    box-shadow: 0 2px 8px var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.theme-toggle::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.theme-toggle:hover::before {
    left: 100%;
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px var(--shadow);
}

.theme-toggle:hover .theme-icon {
    transform: scale(1.1);
}

.theme-icon {
    transition: opacity 0.3s ease;
    color: var(--text-color);
}

.sun-icon {
    display: none;
}

.github-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--card-bg);
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 2px 8px var(--shadow);
    transition: all 0.3s ease;
}

.github-link svg {
    width: 20px;
    height: 20px;
}

.github-link:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px var(--shadow);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
    margin-top: -20px;
}

.title {
    background: linear-gradient(135deg, 
        var(--accent-color) 0%, 
        var(--success-color) 25%, 
        var(--warning-color) 50%, 
        #e74c3c 75%, 
        var(--accent-color) 100%);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 3px;
    margin-bottom: 20px;
    display: inline-block;
    text-transform: uppercase;
    animation: gradientShift 4s ease-in-out infinite;
    position: relative;
    padding: 15px 20px;
}

:root .title::after {
    content: '';
    position: absolute;
    inset: 0;
    background: white;
    border-radius: 12px;
    z-index: -1;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .title::after {
    content: '';
    position: absolute;
    inset: 0;
    background: #1f1f1f;
    border-radius: 12px;
    z-index: -1;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.title::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    padding: 3px;
    background: linear-gradient(90deg, 
        #4a90e2,
        #64b5f6,
        #4caf50,
        #ffb74d,
        #e74c3c,
        #4a90e2);
    background-size: 300% 300%;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    animation: gradientShift 4s linear infinite;
    pointer-events: none;
}

[data-theme="dark"] .title::before {
    filter: drop-shadow(0 0 12px rgba(74, 144, 226, 0.8)) drop-shadow(0 0 25px rgba(74, 144, 226, 0.6)) drop-shadow(0 0 40px rgba(74, 144, 226, 0.3));
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.visitor-text {
    font-size: 1rem;
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 0;
}

.visitor-count {
    font-weight: 700;
    color: var(--accent-color);
    background: none;
    border: none;
    padding: 0;
    display: inline-block;
    font-size: 1rem;
    animation: heartbeat 2s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 30px;
}

/* Project Cards */
.project-card {
    background: var(--card-gradient);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 6px 20px var(--shadow), 0 3px 8px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.06);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.project-card.selected {
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px var(--shadow), 0 5px 12px rgba(0, 0, 0, 0.1), 0 0 0 2px rgba(74, 144, 226, 0.2);
}

.project-card.selected::before {
    opacity: 1;
}

.project-card.selected .project-title {
    color: var(--accent-color);
}

.project-card.selected .tech-list li::before {
    color: var(--accent-color);
}

.project-card.selected .project-header {
    margin-bottom: 32px;
}

.project-card.selected .project-header::after {
    opacity: 1;
    width: 60px;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--success-color), var(--warning-color));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-card:hover::before {
    opacity: 1;
}

.project-card:hover {
    transform: translateY(-8px) scale(1.02);
    background: var(--card-hover-gradient);
    box-shadow: 0 12px 32px var(--shadow), 0 4px 8px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-color);
}

.project-card:hover .project-title {
    color: var(--accent-color);
}

.project-header {
    margin-bottom: 20px;
    position: relative;
}

.project-header::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent-color);
    border-radius: 1px;
    opacity: 0;
    transition: all 0.3s ease;
}

.project-card:hover .project-header::after {
    opacity: 1;
    width: 60px;
}

.project-title {
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 12px;
    color: var(--text-color);
    transition: color 0.3s ease;
    letter-spacing: 0.5px;
}

.project-button {
    background: linear-gradient(135deg, var(--button-bg) 0%, rgba(0, 0, 0, 0.8) 100%);
    color: var(--button-text);
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 0.8rem;
    font-weight: 700;
    text-align: center;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    display: inline-block;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    text-transform: uppercase;
    min-width: 140px;
    margin: 0;
}

button.project-button {
    font-family: inherit;
    line-height: normal;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.project-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.project-button:hover::before {
    left: 100%;
}

.project-button::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 15px;
    width: 0;
    height: 0;
    border-left: 5px solid currentColor;
    border-top: 3px solid transparent;
    border-bottom: 3px solid transparent;
    transform: translateY(-50%);
    transition: all 0.3s ease;
    opacity: 0;
}

.project-button:hover::after {
    opacity: 1;
    right: 12px;
}

.project-button:hover {
    transform: translateY(-3px) scale(1.08);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-color);
}

.project-button.website,
.project-button.github {
    background: linear-gradient(135deg, #333333 0%, #24292e 100%);
    color: white;
    opacity: 0.7;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card.selected .project-button.website,
.project-card.selected .project-button.github,
.project-button.website:hover,
.project-button.github:hover {
    background: linear-gradient(135deg, var(--accent-color) 0%, #2980b9 100%);
    color: white;
    opacity: 1;
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
    border-color: var(--accent-color);
}


/* CSS-only approach - make card 1 inactive by default when hovering grid, then active when hovering card 1 */
.projects-grid:hover .project-card:nth-child(1) .project-button.current {
    opacity: 0.7 !important;
    background: linear-gradient(135deg, #333333 0%, #24292e 100%) !important;
    color: white !important;
    box-shadow: 0 2px 8px var(--shadow) !important;
    border-color: transparent !important;
}

.projects-grid:hover .project-card:nth-child(1):hover .project-button.current {
    opacity: 1 !important;
    background: linear-gradient(135deg, var(--accent-color) 0%, #2980b9 100%) !important;
    color: white !important;
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3) !important;
}

.project-button.current {
    background: linear-gradient(135deg, var(--accent-color) 0%, #2980b9 100%);
    color: white;
    cursor: default;
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
    border-color: var(--accent-color);
}

.project-button.current:hover {
    background: linear-gradient(135deg, var(--accent-color) 0%, #2980b9 100%);
    color: white;
    transform: none;
}

.project-button:disabled {
    cursor: default;
    opacity: 1;
}

.project-button.current::before,
.project-button.current::after {
    display: none;
}

.project-description {
    color: var(--text-color);
    position: relative;
}

.project-description p {
    margin-bottom: 16px;
    font-size: 0.9rem;
    line-height: 1.5;
    opacity: 0.85;
}

.tech-list {
    list-style: none;
    padding: 0;
    margin-top: 16px;
}

.project-description > .tech-list:first-child {
    margin-top: 0;
}

.tech-list li {
    margin-bottom: 8px;
    font-size: 0.82rem;
    padding-left: 16px;
    position: relative;
    transition: all 0.2s ease;
    opacity: 0.85;
}

.project-card:hover .tech-list li {
    opacity: 1;
    transform: translateX(4px);
}

.tech-list li:before {
    content: "▸";
    color: var(--accent-color);
    font-weight: bold;
    position: absolute;
    left: 0;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.project-card:hover .tech-list li::before {
    color: var(--accent-color);
}

.tech-list strong {
    color: var(--text-color);
}

/* Status Badges */
.project-status-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 2;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
}

.project-status-badge.live {
    background: linear-gradient(135deg, var(--success-color), #20c997);
    color: white;
}

.project-card:hover .project-status-badge {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

/* Enhanced animations */
@keyframes cardEntrance {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.2s; }
.project-card:nth-child(3) { animation-delay: 0.3s; }
.project-card:nth-child(4) { animation-delay: 0.4s; }

/* Footer */
.footer {
    margin-top: 30px;
    padding: 25px 20px;
}

.footer-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.footer-text {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 16px;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.footer-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.footer-link:hover {
    color: var(--success-color);
}

.footer-link:hover::after {
    width: 100%;
    background: var(--success-color);
}

.footer-separator {
    color: var(--text-color);
    opacity: 0.4;
    font-size: 0.9rem;
}

.footer-tagline {
    font-size: 0.85rem;
    color: var(--text-color);
    opacity: 0.7;
    margin-top: 12px;
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .theme-toggle,
    .github-link {
        width: 36px;
        height: 36px;
    }
    
    .github-link svg {
        width: 18px;
        height: 18px;
    }
    
    .title {
        font-size: 1.8rem;
        letter-spacing: 2px;
    }
    
    .project-title {
        font-size: 1.1rem;
    }
    
    .project-card {
        padding: 15px;
    }
    
    .footer {
        margin-top: 40px;
        padding: 30px 15px;
    }
    
    .footer-links {
        gap: 8px;
    }
    
    .footer-text,
    .footer-link,
    .footer-tagline {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.4rem;
        letter-spacing: 1px;
    }
}