/* CSS Variables */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #1a1a1a;
    --bg-card-hover: #222222;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border-color: #2a2a2a;
    --accent-purple: #a855f7;
    --accent-blue: #3b82f6;
    --accent-emerald: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

body.light {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-card: #ffffff;
    --bg-card-hover: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --border-color: #e5e7eb;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.theme-toggle-icon {
    font-size: 1.2rem;
}

/* Header */
header {
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.1) 0%, var(--bg-secondary) 50%, rgba(59, 130, 246, 0.1) 100%);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    text-align: center;
}

.header-badge {
    display: inline-block;
    background: rgba(168, 85, 247, 0.2);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 50px;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-purple);
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.header-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* Stats */
.stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    display: block;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Main Container */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

/* Section */
section {
    margin-bottom: 3rem;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.section-line {
    width: 3rem;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue));
    border-radius: 4px;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Accordion */
.accordion {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.accordion-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.accordion-header {
    width: 100%;
    padding: 1.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
    color: var(--text-primary);
    font-family: inherit;
}

.accordion-header:hover {
    background: var(--bg-card-hover);
}

.accordion-title-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.accordion-icon {
    font-size: 1.5rem;
}

.accordion-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.accordion-count {
    background: var(--bg-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.accordion-chevron {
    width: 1.5rem;
    height: 1.5rem;
    transition: transform 0.3s ease;
    color: var(--accent-purple);
}

.accordion-item.active .accordion-chevron {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

.accordion-item.active .accordion-content {
    max-height: 5000px;
}

/* Projects Grid */
.projects {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem;
}

/* Project Card */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(168, 85, 247, 0.1);
    border-color: var(--accent-purple);
}

.project-image-wrapper {
    position: relative;
    width: 100%;
    height: 180px;
    overflow: hidden;
    background: var(--bg-secondary);
}

.project-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover img {
    transform: scale(1.1);
}

.project-level {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    padding: 0.375rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    box-shadow: var(--shadow-md);
}

.project-level[data-level="1"] {
    background: var(--accent-emerald);
}

.project-level[data-level="2"] {
    background: var(--accent-blue);
}

.project-level[data-level="3"] {
    background: var(--accent-orange);
}

.project-level[data-level="4"] {
    background: var(--accent-red);
}

.project-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

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

.project-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tech-tag {
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.project-footer {
    display: flex;
    gap: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.btn {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
}

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

.btn-primary:hover {
    background: #9333ea;
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    flex: 0;
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
}

/* Ghost Card */
.ghost-card {
    opacity: 0.7;
    border: 2px dashed var(--border-color);
}

.ghost-image {
    width: 100%;
    height: 180px;
    background: repeating-linear-gradient(45deg,
            var(--bg-secondary),
            var(--bg-secondary) 10px,
            var(--border-color) 10px,
            var(--border-color) 20px);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--text-muted);
}

.coming-soon {
    text-align: center;
    font-style: italic;
    color: var(--text-muted);
}

/* Info Cards */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
}

.info-card h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.info-card ul {
    list-style: none;
    padding: 0;
}

.info-card li {
    margin-bottom: 0.75rem;
}

.info-card a {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: color 0.3s ease;
}

.info-card a:hover {
    color: var(--accent-purple);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.tech-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.tech-item:hover {
    border-color: var(--accent-purple);
    transform: translateX(4px);
}

.tech-check {
    color: var(--accent-purple);
    font-size: 1.25rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .stats {
        gap: 2rem;
    }

    .projects {
        grid-template-columns: 1fr;
    }

    .theme-toggle {
        top: 1rem;
        right: 1rem;
    }
}