/* CSS Custom Properties / Design Tokens */
:root {
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Plus Jakarta Sans', var(--font-primary);

    /* Light Theme Palette */
    --bg-base: #f8fafc;
    --bg-surface: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.75);
    --border-glass: rgba(226, 232, 240, 0.8);
    --border-glow: rgba(99, 102, 241, 0.2);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    --accent-primary: #4f46e5;
    --accent-hover: #4338ca;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
    --accent-glow: rgba(99, 102, 241, 0.15);

    --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.05), 0 4px 12px -2px rgba(0, 0, 0, 0.03);
    --card-hover-shadow: 0 20px 40px -10px rgba(99, 102, 241, 0.15);

    --glow-color-1: rgba(99, 102, 241, 0.12);
    --glow-color-2: rgba(14, 165, 233, 0.12);

    --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
    /* Dark Theme Palette */
    --bg-base: #090d16;
    --bg-surface: #111827;
    --bg-glass: rgba(17, 24, 39, 0.65);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(129, 140, 248, 0.3);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-primary: #818cf8;
    --accent-hover: #a5b4fc;
    --accent-gradient: linear-gradient(135deg, #818cf8 0%, #38bdf8 100%);
    --accent-glow: rgba(129, 140, 248, 0.25);

    --card-shadow: 0 12px 32px -8px rgba(0, 0, 0, 0.5);
    --card-hover-shadow: 0 24px 48px -12px rgba(129, 140, 248, 0.25);

    --glow-color-1: rgba(129, 140, 248, 0.15);
    --glow-color-2: rgba(56, 189, 248, 0.12);
}

/* Base Resets */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem 1rem;
    position: relative;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Ambient Glow Blobs */
.ambient-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    z-index: 0;
    pointer-events: none;
    transition: background 0.5s ease;
}

.glow-1 {
    width: 450px;
    height: 450px;
    top: -100px;
    left: -100px;
    background: var(--glow-color-1);
}

.glow-2 {
    width: 400px;
    height: 400px;
    bottom: -50px;
    right: -100px;
    background: var(--glow-color-2);
}

/* Page Layout Container */
.page-container {
    width: 100%;
    max-width: 680px;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

/* Top Navigation / Header */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 0.5rem;
}

.brand-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.85rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 9999px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.brand-dot {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 8px #10b981;
    animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.85); }
}

.brand-name {
    font-family: var(--font-heading);
    letter-spacing: -0.01em;
}

.theme-toggle-btn {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
    box-shadow: 0 4px 12px var(--accent-glow);
}

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

/* Main Content Layout */
#main-content {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

/* Hero Section */
.hero-section {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.avatar-wrapper {
    margin-bottom: 0.25rem;
}

.avatar-circle {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--accent-gradient);
    color: #ffffff;
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px var(--accent-glow);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.03em;
}

.highlight-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 580px;
}

.domain-pill {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    padding: 0.15rem 0.5rem;
    border-radius: 6px;
    font-family: monospace;
    font-size: 0.95em;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* Glass Cards */
.glass-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 1.75rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: var(--card-shadow);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.glass-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-glow);
    box-shadow: var(--card-hover-shadow);
}

/* Main Blog Card */
.main-blog-card {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    background: linear-gradient(145deg, var(--bg-surface), var(--bg-glass));
}

.card-header {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.card-badge {
    align-self: flex-start;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-primary);
    background: var(--accent-glow);
    padding: 0.25rem 0.65rem;
    border-radius: 9999px;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.card-text {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Topics List */
.topic-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.topic-tag {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.85rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.topic-tag:hover {
    background: var(--accent-glow);
    transform: translateX(4px);
}

.topic-icon {
    font-size: 1.1rem;
}

.card-action {
    margin-top: 0.5rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem 1.4rem;
    border-radius: 12px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
    opacity: 0.92;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

.external-icon {
    transition: transform 0.2s ease;
}

.btn:hover .external-icon {
    transform: translate(2px, -2px);
}

/* Other Projects Section */
.projects-section {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.section-header {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

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

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

.project-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 1.25rem;
}

.project-card-body {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.project-badge {
    font-size: 0.75rem;
    font-weight: 600;
    color: #10b981;
    background: rgba(16, 185, 129, 0.1);
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    display: inline-block;
}

.project-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Site Footer */
.site-footer {
    text-align: center;
    padding-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-glass);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Responsive Rules */
@media (max-width: 480px) {
    body {
        padding: 1.25rem 0.75rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }

    .card-title {
        font-size: 1.4rem;
    }

    .btn {
        width: 100%;
    }
}