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

:root {
    --navy: #0a1628;
    --dark-gray: #1a2838;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --accent: #cbd5e1;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
    background-color: var(--navy);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    position: relative;
    min-height: 100vh;
    overflow-x: hidden;
}

#rain-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: auto;
    filter: blur(0.5px);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
    background: rgba(10, 22, 40, 0.8);
    backdrop-filter: blur(12px);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Back Link */
.back-link {
    margin-bottom: 2rem;
    display: inline-block;
}

.back-link a {
    color: var(--text-secondary);
    text-decoration: none;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1.5px;
    transition: color 0.2s;
    font-weight: 500;
}

.back-link a:hover {
    color: var(--accent);
}

.back-link a::before {
    content: '← ';
}

/* Post Header */
.post-header {
    border-bottom: 1px solid var(--dark-gray);
    padding-bottom: 2rem;
    margin-bottom: 3rem;
}

.post-date {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.2;
}

.post-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Post Content */
.post-content {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.post-content h2 {
    font-size: 1.8rem;
    margin: 2.5rem 0 1rem;
    color: var(--text-primary);
    border-left: 3px solid var(--accent);
    padding-left: 1rem;
    font-weight: 600;
}

.post-content h3 {
    font-size: 1.4rem;
    margin: 2rem 0 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
}

.post-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    font-size: 1.05rem;
}

.post-content a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s;
}

.post-content a:hover {
    opacity: 0.8;
}

.post-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.post-content em {
    color: var(--text-primary);
    font-style: italic;
}

.post-content ul, .post-content ol {
    margin: 1.5rem 0 1.5rem 2rem;
    color: var(--text-secondary);
}

.post-content li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.post-content code {
    background: var(--dark-gray);
    padding: 0.2rem 0.5rem;
    font-family: 'SF Mono', 'Roboto Mono', monospace;
    font-size: 0.9rem;
    color: var(--accent);
    border: 1px solid var(--dark-gray);
}

.post-content pre {
    background: var(--dark-gray);
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-left: 2px solid var(--accent);
}

.post-content pre code {
    background: none;
    padding: 0;
    border: none;
}

.post-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* Callout Box */
.callout {
    background: var(--dark-gray);
    border-left: 3px solid var(--accent);
    padding: 1.5rem;
    margin: 2rem 0;
}

.callout p:last-child {
    margin-bottom: 0;
}

/* Tags */
.tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--dark-gray);
}

.tag {
    background: transparent;
    padding: 0.3rem 0.8rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    border: 1px solid var(--dark-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Footer */
footer {
    margin-top: 5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--dark-gray);
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-align: center;
}

footer p {
    text-align: center;
    margin: 0 auto;
    max-width: none;
}

/* Tooltip container */
.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dashed var(--accent);
    cursor: help;
}

/* Tooltip text */
.tooltip .tooltip-text {
    visibility: hidden;
    width: max-content;
    max-width: 200px;
    background-color: var(--dark-gray);
    color: var(--text-primary);
    border: 1px solid var(--accent);
    text-align: center;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    position: absolute;
    z-index: 10;
    bottom: 125%; /* default above */
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.9rem;
    line-height: 1.3;
    opacity: 0;
    transition: opacity 0.2s, bottom 0.2s;
    pointer-events: none;
    white-space: nowrap;
}

/* Tooltip arrow */
.tooltip .tooltip-text::after {
    content: '';
    position: absolute;
    top: 100%; /* arrow points down by default */
    left: 50%;
    transform: translateX(-50%);
    border-width: 5px;
    border-style: solid;
    border-color: var(--accent) transparent transparent transparent;
}

/* Show tooltip on hover */
.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Mobile adjustments */
@media (max-width: 480px) {
    .tooltip .tooltip-text {
        bottom: auto;
        top: 125%; /* place below the word on small screens */
    }
    .tooltip .tooltip-text::after {
        top: auto;
        bottom: 100%; /* arrow points up */
        border-color: transparent transparent var(--accent) transparent;
    }
}


/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 1.8rem;
    }

    .post-content h2 {
        font-size: 1.5rem;
    }

    .post-content h3 {
        font-size: 1.2rem;
    }

    .container {
        padding: 1rem;
    }
}