:root {
    --bg-color: #0a0a0a;
    --card-bg: #1a1a1a;
    --card-border: #2a2a2a;
    --card-text: #f3f4f6;
    --card-desc: #9ca3af;
    --title-color: #ffffff;
    --card-title: #f3f4f6;
    --accent-color: #60a5fa;
    --accent-hover: #3b82f6;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
}

body.light-mode {
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --card-border: #e5e7eb;
    --card-text: #111827;
    --card-desc: #6b7280;
    --title-color: #111827;
    --card-title: #111827;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --shadow: rgba(0, 0, 0, 0.05);
    --shadow-hover: rgba(0, 0, 0, 0.15);
}

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

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

.page-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 60px 0;
}

.theme-toggle {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 1000;
}

.toggle-switch {
    position: relative;
    width: 56px;
    height: 28px;
    background-color: var(--card-border);
    border-radius: 28px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--card-border);
}

.toggle-switch:hover {
    background-color: var(--card-desc);
}

.toggle-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 22px;
    height: 22px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

body.light-mode .toggle-slider {
    transform: translateX(28px);
    background-color: #ffffff;
}

body.light-mode .toggle-switch {
    background-color: #3b82f6;
    border-color: #3b82f6;
}

.main-title {
    color: var(--title-color);
    transition: color 0.3s ease;
    font-weight: 600;
    font-size: 2.5rem;
    letter-spacing: -0.025em;
    margin-bottom: 0.75rem;
}

.subtitle {
    color: var(--card-desc);
    font-size: 1.125rem;
    font-weight: 400;
    margin-bottom: 3rem;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 32px 24px;
    text-align: left;
    box-shadow: 0 1px 3px var(--shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    text-decoration: none;
    color: var(--card-text);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

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

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px var(--shadow-hover);
    border-color: var(--accent-color);
    text-decoration: none;
    color: var(--card-text);
}

.project-icon {
    font-size: 2rem;
    margin-bottom: 16px;
    opacity: 0.9;
}

.project-card .card-title {
    color: var(--card-title);
    font-weight: 600;
    font-size: 1.25rem;
    transition: color 0.3s ease;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

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

.project-card .card-text {
    color: var(--card-desc);
    transition: color 0.3s ease;
    font-size: 0.9375rem;
    line-height: 1.6;
    margin: 0;
}

.project-tag {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 12px;
    margin-top: auto;
    align-self: flex-start;
    margin-top: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.project-card:hover .project-tag {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .page-wrapper {
        padding: 40px 0;
    }

    .theme-toggle {
        top: 20px;
        right: 20px;
    }

    .main-title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }
}