/* 
   SETH LEGGATT - DESIGN SYSTEM
   Aesthetic: Contemporary High-End Editorial Minimal
   Goal: Pure visual appeal, effortless elegance, striking contrast. No literal metaphors.
*/

:root {
    --bg-core: #050505;
    --bg-surface: #0f0f0f;
    --text-main: #f4f4f5;
    --text-muted: #a1a1aa;
    --border-divider: rgba(255, 255, 255, 0.08);
    --focus-ring: #6ee7ff;

    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --space-xs: 0.5rem;
    --space-sm: 1.5rem;
    --space-md: 3rem;
    --space-lg: 6rem;
    --space-xl: 10rem;
}

/* SKIP LINK */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-sm);
    z-index: 1000;
    padding: 0.75rem 1.25rem;
    background-color: var(--text-main);
    color: var(--bg-core);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-decoration: none;
    border-radius: 100px;
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: var(--space-sm);
}

/* RESET & BASE */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-core);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    letter-spacing: -0.01em;
}

/* FOCUS STYLES */
:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 3px;
    border-radius: 4px;
}

/* REDUCED MOTION */
@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;
    }
}

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

/* TYPOGRAPHY */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 500;
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.text-accent {
    color: var(--text-muted);
    font-style: normal;
    font-weight: 400;
}

.data-mono, .sys-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.sys-label {
    margin-bottom: var(--space-sm);
    display: inline-block;
}

/* LAYOUT */
.layout-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

.brand-logo {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    text-decoration: none;
    color: inherit;
}

.brand-logo:hover, .brand-logo:focus {
    color: var(--text-main);
}

.primary-nav {
    display: flex;
    gap: var(--space-md);
}

.primary-nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color 0.3s ease;
}

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

.primary-nav a[aria-current="page"] {
    color: var(--text-main);
}

/* SPOTLIGHT — optional announcement pill. Invisible when empty. */
.spotlight {
    margin-top: var(--space-lg);
    padding: 1.25rem var(--space-md);
    border: 1px solid var(--border-divider);
    border-radius: 100px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm);
    max-width: 900px;
}

.spotlight:empty {
    display: none;
}

.spotlight a {
    color: var(--text-main);
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-color: var(--border-divider);
    transition: text-decoration-color 0.3s ease;
}

.spotlight a:hover,
.spotlight a:focus {
    text-decoration-color: var(--text-main);
}

/* HERO SECTION */
.hero-section {
    padding: var(--space-xl) 0 var(--space-lg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 60vh;
}

.hero-thesis {
    font-size: clamp(2.5rem, 6vw, 5rem);
    margin: var(--space-sm) 0;
    max-width: 900px;
}

.hero-lead {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    line-height: 1.5;
    max-width: 700px;
}

.action-group {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-md);
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-body);
    font-size: 0.85rem;
    padding: 1.25rem 2.5rem;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid transparent;
    border-radius: 100px; 
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}

.btn-primary {
    background-color: var(--text-main);
    color: var(--bg-core);
    font-weight: 500;
}

.btn-primary:hover, .btn-primary:focus {
    transform: scale(1.02);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.1);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border-color: var(--border-divider);
}

.btn-secondary:hover, .btn-secondary:focus {
    border-color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-outline {
    background: transparent;
    color: var(--text-main);
    border-color: var(--border-divider);
    padding: 0.75rem 1.5rem;
    font-size: 0.75rem;
    border-radius: 100px;
}

.btn-outline:hover, .btn-outline:focus {
    border-color: var(--text-main);
}

/* TRACK SECTIONS */
.track-section {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--border-divider);
}

.section-header {
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: 0.85rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* DATA LIST */
.data-list {
    list-style: none;
}

.data-row {
    display: grid;
    grid-template-columns: 150px 1fr auto;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--border-divider);
    transition: background-color 0.4s ease, padding 0.4s ease;
}

.data-row:hover {
    background-color: var(--bg-surface);
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
    border-radius: 8px;
    border-bottom-color: transparent;
}

.data-fluid h4 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.data-fluid p {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-family: var(--font-body);
}

/* FORMS */
.form-container {
    max-width: 600px;
}

.form-context {
    margin-bottom: var(--space-md);
    color: var(--text-muted);
    font-size: 1rem;
}

.mailing-form {
    display: flex;
    gap: 0.5rem;
}

.mailing-form input {
    flex: 1;
    background-color: transparent;
    border: 1px solid var(--border-divider);
    border-radius: 100px;
    color: var(--text-main);
    padding: 1.25rem 1.5rem;
    font-family: var(--font-body);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.mailing-form input:focus {
    border-color: var(--text-main);
}

/* FOOTER */
.site-footer {
    padding: var(--space-lg) 0 var(--space-md);
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* SUB-PAGE HEADER */
.page-header {
    padding: var(--space-lg) 0 var(--space-md);
    border-bottom: 1px solid var(--border-divider);
}

.page-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin: var(--space-sm) 0;
}

.page-lead {
    color: var(--text-muted);
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    line-height: 1.5;
    max-width: 700px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-decoration: none;
    margin-bottom: var(--space-sm);
    transition: color 0.3s ease;
}

.back-link::before {
    content: "←";
    transition: transform 0.3s ease;
}

.back-link:hover, .back-link:focus {
    color: var(--text-main);
}

.back-link:hover::before, .back-link:focus::before {
    transform: translateX(-4px);
}

/* CONTENT BLOCKS */
.content-block {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--border-divider);
}

.content-block p {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 680px;
    margin-bottom: var(--space-sm);
}

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

/* CARD GRID */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: var(--space-md);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-divider);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-main);
    transition: border-color 0.3s ease, transform 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}

.card:hover, .card:focus {
    border-color: var(--text-main);
    transform: translateY(-4px);
}

.card-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.card-title {
    font-size: 1.5rem;
}

.card-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.card-cta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-main);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* SOCIAL GRID */
.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.social-link {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--space-md);
    border: 1px solid var(--border-divider);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-main);
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.social-link:hover, .social-link:focus {
    border-color: var(--text-main);
    background-color: var(--bg-surface);
}

.social-link .platform {
    font-size: 1.25rem;
}

.social-link .handle {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* HUB NAV CARDS */
.hub-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

/* FORM SUCCESS STATE */
.form-status {
    margin-top: var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-main);
    min-height: 1.2em;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .data-row {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    
    .mailing-form {
        flex-direction: column;
    }
    
    .primary-nav {
        display: none;
    }
    
    .hero-thesis {
        font-size: clamp(2rem, 8vw, 3.5rem);
    }
    
    .layout-grid {
        padding: 0 var(--space-sm);
    }
}

/* MOBILE NAVIGATION */
.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border-divider);
    border-radius: 100px;
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.5rem 1rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: inline-flex;
    }

    .primary-nav {
        display: none;
        flex-direction: column;
        gap: var(--space-xs);
        position: absolute;
        top: calc(var(--space-md) + 2rem);
        right: var(--space-sm);
        left: var(--space-sm);
        padding: var(--space-sm);
        background-color: var(--bg-surface);
        border: 1px solid var(--border-divider);
        border-radius: 12px;
    }

    .primary-nav.is-open {
        display: flex;
    }
}