/* ==========================================================================
    Modern Font Loading with Performance Optimization
    ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');



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

* {
    margin: 0;
    padding: 0;
}

html {
    font-size: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
    height: auto;
}

input, button, textarea, select {
    font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
    overflow-wrap: break-word;
}

/* ==========================================================================
    Accessibility & Focus Management
    ========================================================================== */
.skip-link {
    position: absolute;
    top: calc(-1 * var(--spacing-24));
    left: var(--spacing-2);
    background: var(--color-text-dark);
    color: var(--color-text-inverse);
    padding: var(--spacing-3) var(--spacing-4);
    text-decoration: none;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    z-index: 1000;
    font-weight: 600;
    transition: top var(--transition-base);
}

.skip-link:focus {
    top: 0;
}

/* Modern focus styles with better visibility */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Remove default focus outline for elements that use focus-visible */
:focus:not(:focus-visible) {
    outline: none;
}

/* ==========================================================================
    Typography
    ========================================================================== */
.hero-title, .section-title, .person-name, .book-title, .air-title {
    font-family: var(--font-display);
    line-height: var(--line-height-tight);
    font-weight: 700;
    letter-spacing: -0.025em;
}

.hero-title {
    font-size: clamp(var(--font-size-4xl), 5vw, var(--font-size-6xl));
    margin-block-end: var(--spacing-8);
    max-inline-size: 15ch;
    margin-inline: auto;
    color: var(--color-secondary-800);
    font-weight: 800;
    letter-spacing: -0.03em;
    text-align: center;
}

.section-title {
    font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-4xl));
    text-align: center;
    margin-block-end: var(--spacing-20);
    color: var(--color-text-dark);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(var(--font-size-lg), 2.5vw, var(--font-size-xl));
    color: var(--color-text-light);
    font-weight: 400;
    margin-block-end: var(--spacing-16);
    line-height: var(--line-height-relaxed);
    max-inline-size: 50ch;
    margin-inline: auto;
    text-align: center;
}

/* ==========================================================================
    Hero Section
    ========================================================================== */
.hero {
    background: var(--gradient-hero);
    color: var(--color-text-dark);
    padding: var(--spacing-24) var(--spacing-12);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%236366f1' fill-opacity='0.05'%3E%3Cpath d='m36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
    opacity: 0.3;
    z-index: -1;
}


.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-12);
    flex-wrap: wrap;
    margin-block-start: var(--spacing-8);
    position: relative;
    z-index: 1;
    min-height: 2rem;
    width: 100%;
}

#rotating-stat {
    padding: var(--spacing-3) var(--spacing-5);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-secondary-900);
}

/* ==========================================================================
    Layout Components
    ========================================================================== */
.about-section {
    padding: var(--spacing-24) var(--spacing-12);
    max-inline-size: var(--container-max);
    margin-inline: auto;
    background: var(--color-background-subtle);
}

.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 28rem), 1fr));
    gap: var(--spacing-12);
    margin-block-start: var(--spacing-12);
}

/* ==========================================================================
    Card Components
    ========================================================================== */
.person-card {
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-12);
    box-shadow: var(--shadow-base);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
    transition: var(--transition-all);
}

.person-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.person-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
    opacity: 0;
    transition: var(--transition-base);
}



.person-card:hover::before {
    opacity: 1;
}

.person-photo {
    inline-size: 8rem;
    block-size: 8rem;
    border-radius: var(--radius-full);
    object-fit: cover;
    margin-block-end: var(--spacing-6);
    border: 3px solid var(--color-primary);
    transition: var(--transition-all);
    box-shadow: var(--shadow-sm);
}

.person-card:hover .person-photo {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.person-name {
    font-size: var(--font-size-xl);
    color: var(--color-text-dark);
    margin-block-end: var(--spacing-2);
    font-weight: 700;
}

.person-title {
    color: var(--color-text-muted);
    font-weight: 500;
    margin-block-end: var(--spacing-6);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.person-description {
    margin-block-end: var(--spacing-8);
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
    max-inline-size: var(--content-max-width);
}

/* ==========================================================================
    Utility Classes
    ========================================================================== */
.hover-lift {
    transition: var(--transition-all);
}

.hover-lift:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.hover-lift-subtle {
    transition: var(--transition-all);
}

.hover-lift-subtle:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.shimmer-effect::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition-base);
}

.shimmer-effect:hover::before {
    left: 100%;
}

/* ==========================================================================
    Button & Link Components
    ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
    color: white;
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-sm);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    transition: var(--transition-all);
    border: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition-base);
}

.btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.btn:hover::before {
    left: 100%;
}

/* ==========================================================================
    Air Section
    ========================================================================== */
.air-section {
    padding: var(--spacing-24) var(--spacing-12);
    background: var(--color-background);
    max-inline-size: var(--container-max);
    margin-inline: auto;
    position: relative;
    overflow: hidden;
}

.air-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%2306b6d4' fill-opacity='0.03' fill-rule='evenodd'%3E%3Cpath d='M20 20c0-5.5-4.5-10-10-10s-10 4.5-10 10 4.5 10 10 10 10-4.5 10-10zm10 0c0-5.5-4.5-10-10-10s-10 4.5-10 10 4.5 10 10 10 10-4.5 10-10z'/%3E%3C/g%3E%3C/svg%3E") repeat;
    z-index: -1;
}

.air-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-20);
    align-items: center;
}

@media (max-width: 768px) {
    .air-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-12);
    }
}

.air-title {
    font-size: clamp(var(--font-size-2xl), 3vw, var(--font-size-3xl));
    color: var(--color-text-dark);
    margin-block-end: var(--spacing-6);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.air-description {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-light);
    margin-block-end: var(--spacing-12);
    max-inline-size: var(--content-max-width);
}

.air-buttons {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}



/* ==========================================================================
    Code Display
    ========================================================================== */
.code-container {
    background: var(--color-slate-900);
    border: 1px solid var(--color-slate-700);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.code-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2rem;
    background: var(--color-slate-800);
    display: flex;
    align-items: center;
    padding-left: var(--spacing-4);
}

.code-container::after {
    content: '● ● ●';
    position: absolute;
    top: 0;
    left: var(--spacing-4);
    height: 2rem;
    display: flex;
    align-items: center;
    color: var(--color-slate-500);
    font-size: var(--font-size-xs);
    z-index: 1;
}

.code-block {
    background: var(--color-slate-900);
    color: var(--color-slate-100);
    padding: var(--spacing-12);
    padding-top: calc(var(--spacing-12) + 2rem);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin: 0;
    overflow-x: auto;
    white-space: pre;
}

/* ==========================================================================
    Books Section
    ========================================================================== */
.books-section {
    padding: var(--spacing-24) var(--spacing-12);
    background: var(--color-background-subtle);
    max-inline-size: var(--container-max);
    margin-inline: auto;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr));
    gap: var(--spacing-12);
    margin-block-start: var(--spacing-12);
}

.book-card {
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-base);
    border: 1px solid var(--color-border);
    position: relative;
    transition: var(--transition-all);
}

.book-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-secondary);
    opacity: 0;
    transition: var(--transition-base);
}

.book-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-secondary);
}

.book-card:hover::before {
    opacity: 1;
}

.book-cover {
    inline-size: 100%;
    block-size: 16rem;
    object-fit: cover;
    display: block;
    transition: var(--transition-all);
}

.book-card:hover .book-cover {
    transform: scale(1.05);
}

.book-content {
    padding: var(--spacing-12);
}

.book-title {
    font-size: var(--font-size-xl);
    color: var(--color-text-dark);
    margin-block-end: var(--spacing-4);
    font-weight: 700;
}

.book-description {
    color: var(--color-text-light);
    margin-block-end: var(--spacing-8);
    line-height: var(--line-height-relaxed);
    max-inline-size: var(--content-max-width);
}

/* ==========================================================================
    Footer
    ========================================================================== */
.footer {
    background: var(--color-slate-900);
    color: var(--color-text-inverse);
    padding: var(--spacing-12);
    text-align: center;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-8);
    margin-block-end: var(--spacing-8);
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--color-text-inverse);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-all);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-md);
    position: relative;
}

.footer-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition-base);
    transform: translateX(-50%);
}

.footer-nav a:hover {
    color: var(--color-primary);
    transform: translateY(-2px);
}

.footer-nav a:hover::after {
    width: 100%;
}

.copyright {
    font-size: var(--font-size-sm);
    opacity: 0.7;
    color: var(--color-slate-400);
}

/* ==========================================================================
    Responsive Design
    ========================================================================== */
@media (max-width: 768px) {
    :root {
        --font-size-base: 1rem;
    }

    .hero {
        padding: var(--spacing-5xl) var(--spacing-lg);
    }

    .hero-stats {
        gap: var(--spacing-lg);
    }

    .hero-stat {
        font-size: var(--font-size-sm);
        padding: var(--spacing-sm) var(--spacing-lg);
    }

    .about-section,
    .air-section,
    .books-section {
        padding: var(--spacing-5xl) var(--spacing-lg);
    }

    .people-grid,
    .books-grid,
    .air-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .person-description,
    .air-description,
    .book-description {
        max-inline-size: none;
    }

    .footer {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .footer-nav {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .air-buttons {
        justify-content: center;
    }
}

@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;
    }
}

#skyCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
}