@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&family=Outfit:wght@400;700&family=Orbitron:wght@500;700;800&display=swap');

:root {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --secondary-text: #666666;
    --accent-color: #2563eb;
    --border-color: #eeeeee;
    --code-bg: #f8f9fa;
    --strong-color: #000000;
    --canvas-bg: #ffffff;
    --canvas-border: var(--border-color);
    --article-surface: transparent;
    --article-shadow: none;
    --hero-panel-bg: #f8fafc;
    --hero-panel-border: #e2e8f0;
    --hero-label: #0f172a;
    --hero-grid: #e2e8f0;
    --hero-wave-mono: #111111;
    --hero-wave-a: #2563eb;
    --hero-wave-b: #ef4444;
    --hero-arrow: #94a3b8;
    --hero-meter-border: #cbd5e1;
    --hero-meter-label: #64748b;
    --hero-card-left-bg: #eef6ff;
    --hero-card-right-bg: #f6f0ff;
    --hero-card-left-border: #dbeafe;
    --hero-card-right-border: #e9d5ff;
    --max-width: 800px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 2rem 1rem;
    transition: background-color 0.25s ease, color 0.25s ease;
}

article {
    max-width: var(--max-width);
    margin: 0 auto;
    background: var(--article-surface);
    box-shadow: var(--article-shadow);
    border-radius: 14px;
    transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

header {
    margin-bottom: 3rem;
    text-align: center;
}

h1, h2, h3, h4 {
    font-family: 'Outfit', sans-serif;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

h1 {
    font-size: 3rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
    color: var(--secondary-text);
    font-weight: 500;
}

p {
    margin-bottom: 1.5rem;
}

ul, ol {
    margin-bottom: 1.5rem;
    margin-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

strong {
    font-weight: 700;
    color: var(--strong-color);
}

a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px dotted var(--secondary-text);
    transition: border-color 0.2s, color 0.2s;
}

a:hover {
    border-bottom-color: var(--text-color);
    color: var(--text-color);
}

a::after {
    content: " 🔗";
    font-size: 0.8em;
    opacity: 0.6;
    margin-left: 2px;
    display: inline-block;
}

.math-block {
    margin: 2.5rem 0;
    padding: 1.5rem;
    background: var(--code-bg);
    border-radius: 8px;
    text-align: center;
    font-size: 1.2rem;
    overflow-x: auto;
}

blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1.5rem;
    font-style: italic;
    margin: 2rem 0;
    color: var(--secondary-text);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 700;
    background: var(--code-bg);
}

pre {
    background: var(--code-bg);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 2rem 0;
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

code {
    font-family: inherit;
}

canvas {
    background: var(--canvas-bg) !important;
    border-color: var(--canvas-border) !important;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
}

.theme-toggle button {
    appearance: none;
    border: 1px solid var(--border-color);
    background: var(--code-bg);
    color: var(--text-color);
    font: 600 0.8rem/1 'Outfit', sans-serif;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border-radius: 999px;
    padding: 0.45rem 0.8rem;
    cursor: pointer;
    transition: transform 0.15s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.theme-toggle button:hover {
    transform: translateY(-1px);
}

.theme-toggle button:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

:root[data-theme="retro-juno"] {
    --bg-color: #262b33;
    --text-color: #e6e8dc;
    --secondary-text: #bdc4c9;
    --accent-color: #d06707;
    --border-color: #4f5862;
    --code-bg: #1f242b;
    --strong-color: #f3f0df;
    --canvas-bg: #11151a;
    --canvas-border: #5a6572;
    --article-surface: linear-gradient(180deg, rgba(18, 22, 29, 0.86), rgba(23, 28, 35, 0.86));
    --article-shadow: 0 20px 50px rgba(7, 10, 14, 0.45);
    --hero-panel-bg: #1e242d;
    --hero-panel-border: #5a6572;
    --hero-label: #f1edd9;
    --hero-grid: #414b57;
    --hero-wave-mono: #f3f0df;
    --hero-wave-a: #3568b9;
    --hero-wave-b: #d06707;
    --hero-arrow: #9ba5b0;
    --hero-meter-border: #5e6977;
    --hero-meter-label: #c4ccd2;
    --hero-card-left-bg: #1d2734;
    --hero-card-right-bg: #2d2118;
    --hero-card-left-border: #3568b9;
    --hero-card-right-border: #d06707;
}

:root[data-theme="retro-juno"] body {
    background-image:
        linear-gradient(90deg, rgba(208, 103, 7, 0.08), rgba(53, 104, 185, 0.08)),
        repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.02) 1px, transparent 1px, transparent 3px);
}

:root[data-theme="retro-juno"] h2 {
    border-bottom-color: #3568b9;
}

:root[data-theme="retro-juno"] article {
    padding: 1.6rem 2.2rem 2.2rem;
}

:root[data-theme="retro-juno"] h1,
:root[data-theme="retro-juno"] h2,
:root[data-theme="retro-juno"] h3,
:root[data-theme="retro-juno"] h4 {
    font-family: 'Orbitron', 'Outfit', sans-serif;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

:root[data-theme="retro-juno"] h1 {
    font-weight: 800;
    font-size: 2.65rem;
}

:root[data-theme="retro-juno"] h2 {
    font-weight: 700;
}

:root[data-theme="retro-juno"] h3,
:root[data-theme="retro-juno"] h4 {
    font-weight: 500;
}

:root[data-theme="retro-juno"] a {
    border-bottom-color: #7f8a96;
}

:root[data-theme="retro-juno"] a:hover {
    border-bottom-color: var(--accent-color);
    color: #ffd8a5;
}

:root[data-theme="retro-juno"] th {
    background: #262d36;
}

.placeholder {
    width: 100%;
    height: 300px;
    background: #f0f4f8;
    border: 2px dashed #cbd5e1;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 2rem 0;
    border-radius: 12px;
    color: #64748b;
    font-size: 0.875rem;
    position: relative;
}

.placeholder-group {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 3rem 0;
}

.placeholder-group .placeholder {
    margin: 0;
    flex: 1;
}

.placeholder-group img {
    width:calc(50% - 0.75rem);
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border-radius: 12px;
}

img.article-image {
    width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 2rem 0;
}

.placeholder::before {
    content: attr(data-type);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Subtle Micro-animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

article > * {
    animation: fadeIn 0.5s ease-out forwards;
}

@media (max-width: 600px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    body { padding: 1.5rem 1rem; }
    .theme-toggle { top: 0.75rem; right: 0.75rem; }
    .theme-toggle button { padding: 0.4rem 0.65rem; font-size: 0.75rem; }
    :root[data-theme="retro-juno"] article { padding: 1.15rem 1.1rem 1.6rem; }
    :root[data-theme="retro-juno"] h1 { font-size: 2.2rem; }
}