/* ========================================
   Colin Olliver — Personal Site
   Dark theme, Inter font, teal accent
   ======================================== */

:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-card: #1a2235;
    --bg-card-hover: #1f2a40;
    --text-primary: #e8edf5;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #06b6d4;
    --accent-glow: rgba(6, 182, 212, 0.15);
    --accent-dim: rgba(6, 182, 212, 0.6);
    --border: rgba(148, 163, 184, 0.1);
    --border-accent: rgba(6, 182, 212, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Radar ring colors */
    --radar-core: #06b6d4;
    --radar-strong: #22d3ee;
    --radar-working: #67e8f9;
    --radar-exploring: #a5f3fc;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: var(--bg-primary);
}

/* ========================================
   Navigation
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 2rem;
    transition: var(--transition);
    background: transparent;
}

.nav.scrolled {
    background: rgba(10, 15, 26, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition);
    letter-spacing: 0.01em;
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(10, 15, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 1.5rem 2rem;
    z-index: 99;
    flex-direction: column;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
}

.mobile-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 0.5rem 0;
    transition: color var(--transition);
}

.mobile-menu a:hover {
    color: var(--accent);
}

.mobile-menu.open {
    display: flex;
}

/* ========================================
   Hero
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
    position: relative;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.03) 0%, transparent 50%),
        var(--bg-primary);
}

.hero-content {
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    border: 1px solid var(--border-accent);
    padding: 0.375rem 1rem;
    border-radius: 100px;
    margin-bottom: 2rem;
}

.hero-name {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    color: var(--text-primary);
    font-weight: 400;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    font-weight: 400;
}

.hero-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 100px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.hero-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* ========================================
   Sections
   ======================================== */
.section {
    padding: 6rem 2rem;
    position: relative;
}

.section:nth-child(even) {
    background: var(--bg-secondary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.125rem;
    margin-bottom: 3rem;
}

/* ========================================
   Fade-in Animation
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Case Studies
   ======================================== */
.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.case-card:hover {
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
}

.case-card-inner {
    padding: 2rem;
}

.case-number {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
}

.case-title {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.case-preview {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.case-metrics {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
}

.metric-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.case-expand-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--accent);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0;
    font-family: var(--font);
    transition: var(--transition);
}

.case-expand-btn:hover {
    gap: 0.75rem;
}

.case-expand-btn svg {
    transition: transform var(--transition);
}

.case-expand-btn:hover svg {
    transform: translateX(4px);
}

/* Case expanded overlay */
.case-expanded {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 15, 26, 0.92);
    backdrop-filter: blur(10px);
    z-index: 200;
    overflow-y: auto;
    padding: 2rem;
    animation: fadeIn 0.3s ease-out;
}

.case-expanded.open {
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.case-expanded-content {
    max-width: 700px;
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 3rem;
    margin: 4rem auto;
    position: relative;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.case-expanded-content .case-number {
    margin-bottom: 1rem;
}

.case-expanded-content h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.case-expanded-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.case-expanded-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.case-expanded-content ul {
    color: var(--text-secondary);
    padding-left: 1.25rem;
    margin-bottom: 1rem;
}

.case-expanded-content li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.case-expanded-content strong {
    color: var(--accent);
    font-weight: 600;
}

.case-close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    transition: color var(--transition);
}

.case-close-btn:hover {
    color: var(--text-primary);
}

/* ========================================
   Tech Radar
   ======================================== */
.radar-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.radar-container {
    width: 100%;
    max-width: 700px;
    aspect-ratio: 1;
    position: relative;
}

#tech-radar-svg {
    width: 100%;
    height: 100%;
}

.radar-legend {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-core { background: var(--radar-core); }
.legend-strong { background: var(--radar-strong); }
.legend-working { background: var(--radar-working); }
.legend-exploring { background: var(--radar-exploring); }

.radar-tooltip {
    position: fixed;
    background: var(--bg-card);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 300;
    max-width: 280px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.radar-tooltip.visible {
    opacity: 1;
}

.radar-tooltip .tooltip-title {
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.radar-tooltip .tooltip-ring {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ========================================
   Projects
   ======================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}

.project-type {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.project-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.project-icon {
    width: 56px;
    height: 56px;
    max-width: 56px;
    max-height: 56px;
    border-radius: 12px;
    flex-shrink: 0;
    object-fit: cover;
}

.project-header .project-title {
    margin-bottom: 0;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    flex: 1;
    margin-bottom: 1.5rem;
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--text-primary);
}

/* ========================================
   Timeline
   ======================================== */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--border));
}

.timeline-item {
    position: relative;
    padding-bottom: 2.5rem;
    padding-left: 1.5rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    z-index: 1;
}

.timeline-item:first-child .timeline-marker {
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.timeline-date {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.timeline-role {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.timeline-company {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.timeline-location {
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.timeline-location::before {
    content: '·';
    margin: 0 0.5rem;
}

/* ========================================
   Writing
   ======================================== */
.writing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

.writing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.writing-card:hover {
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}

.writing-tag {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    display: inline-block;
    margin-bottom: 1rem;
    width: fit-content;
}

.writing-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.writing-excerpt {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    flex: 1;
    margin-bottom: 1rem;
}

.writing-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ========================================
   Availability
   ======================================== */
.availability-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.availability-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: var(--transition);
}

.availability-card:hover {
    border-color: var(--border-accent);
}

.availability-type {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.availability-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.availability-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.contact-bar {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color var(--transition);
}

.contact-item:hover {
    color: var(--accent);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8125rem;
    border-top: 1px solid var(--border);
}

/* ========================================
   Article Pages
   ======================================== */
.article-page {
    max-width: 720px;
    margin: 0 auto;
    padding: 6rem 2rem 4rem;
}

.article-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 3rem;
    transition: color var(--transition);
}

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

.article-tag {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    display: inline-block;
    margin-bottom: 1.5rem;
}

.article-title {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 1rem;
}

.article-meta {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.article-content {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.article-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.article-content p {
    margin-bottom: 1.25rem;
}

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

.article-content ul, .article-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1.25rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1.25rem;
    margin: 1.5rem 0;
    color: var(--text-primary);
    font-style: italic;
}

.article-footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.article-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.article-footer a:hover {
    color: var(--text-primary);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
    .case-studies-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .availability-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .section {
        padding: 4rem 1.25rem;
    }

    .hero {
        padding: 1.25rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .writing-grid {
        grid-template-columns: 1fr;
    }

    .case-expanded-content {
        padding: 2rem;
        margin: 5rem 0 2rem;
    }

    .contact-bar {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .radar-legend {
        gap: 1rem;
    }

    .article-page {
        padding: 5rem 1.25rem 3rem;
    }
}

@media (max-width: 480px) {
    .hero-links {
        flex-direction: column;
        align-items: center;
    }

    .case-metrics {
        flex-direction: column;
        gap: 0.75rem;
    }
}