:root {
    /* Colors - Modern, Professional, with "Aviation/Mixology" accents */
    --bg-body: #0f172a;
    /* Slate 900 */
    --bg-card: #1e293b;
    /* Slate 800 */
    --bg-chip: #334155;
    /* Slate 700 */
    --text-main: #f8fafc;
    /* Slate 50 */
    --text-muted: #94a3b8;
    /* Slate 400 */
    --border-subtle: #334155;
    /* Slate 700 */

    /* Accents */
    --accent-primary: #38bdf8;
    /* Sky 400 - Aviation feel */
    --accent-secondary: #f472b6;
    /* Pink 400 - Mixology/Vibrant touch */
    --accent-glow: rgba(56, 189, 248, 0.15);

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-mono: 'Space Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 4rem;

    /* Layout */
    --max-width: 72ch;
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-bounce: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@media (prefers-color-scheme: light) {
    :root {
        --bg-body: #f8fafc;
        /* Slate 50 */
        --bg-card: #ffffff;
        /* White */
        --bg-chip: #e2e8f0;
        /* Slate 200 */
        --text-main: #0f172a;
        /* Slate 900 */
        --text-muted: #64748b;
        /* Slate 500 */
        --border-subtle: #cbd5e1;
        /* Slate 300 */

        --accent-primary: #0284c7;
        /* Sky 600 */
        --accent-secondary: #db2777;
        /* Pink 600 */
        --accent-glow: rgba(2, 132, 199, 0.08);
    }
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

h1,
h2,
h3,
h4 {
    margin: 0;
    font-weight: 700;
    line-height: 1.2;
}

a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

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

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

img {
    max-width: 100%;
    display: block;
}

/* Layout Utilities */
.page-wrap {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

.section {
    padding: var(--space-lg) 0;
}

/* Header / Nav */
.site-header {
    padding: var(--space-md) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.nav-brand {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

.site-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: var(--space-md);
}

.site-nav a {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--text-main);
}

/* Hero */
.hero {
    margin-bottom: var(--space-xl);
    max-width: var(--max-width);
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    letter-spacing: -0.05em;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--text-main) 60%, var(--text-muted));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 50ch;
    margin-bottom: var(--space-md);
}

.chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    background-color: var(--bg-chip);
    border: 1px solid var(--border-subtle);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-main);
    transition: transform var(--transition-fast);
}

.chip:hover {
    transform: translateY(-1px);
}

/* Activities Grid */
.grid-2-col {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

@media (min-width: 768px) {
    .grid-2-col {
        grid-template-columns: repeat(2, 1fr);
    }
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    transition: transform var(--transition-bounce), box-shadow var(--transition-fast), border-color var(--transition-fast);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px -10px var(--accent-glow);
    border-color: var(--accent-primary);
}

.card-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
    color: var(--text-main);
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
    flex-grow: 1;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
}

.small-tag {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Coding Fuel */
.fuel-container {
    max-width: var(--max-width);
}

.fuel-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--space-sm);
}

.photo-card {
    display: block;
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-subtle);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.photo-card:hover {
    transform: scale(1.02);
    border-color: var(--accent-primary);
    z-index: 10;
}

.photo-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 4/3;
    transition: transform var(--transition-fast);
}

/* Footer */
.site-footer {
    margin-top: auto;
    padding: var(--space-xl) 0 var(--space-lg);
    border-top: 1px solid var(--border-subtle);
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.footer-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.25rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-weight: 600;
    transition: all var(--transition-fast);
}

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

/* Utilities */
.muted {
    color: var(--text-muted);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Micro-interactions */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
        animation: none !important;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.5s;
}

.delay-3 {
    animation-delay: 0.8s;
}

.delay-4 {
    animation-delay: 1.1s;
}

.delay-5 {
    animation-delay: 1.4s;
}

/* Large Link List (for Landing Page) */
.big-nav-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    font-size: 1.5rem;
    font-weight: 500;
}

.big-nav-list a {
    color: var(--text-muted);
    transition: color 0.3s, padding 0.3s;
}

.big-nav-list a:hover {
    color: var(--text-main);
    padding-left: 10px;
    /* Slide effect */
}