/* ============================================
   Charlie Minderhout — Personal Site
   ============================================ */

:root {
    --ink: #10151f;
    --ink-soft: #3d4656;
    --muted: #6b7484;
    --accent: #1d4ed8;
    --accent-dark: #1e40af;
    --surface: #ffffff;
    --surface-alt: #f6f8fb;
    --border: #e4e8ee;
    --max-width: 860px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--surface);
    color: var(--ink);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

::selection {
    background: var(--accent);
    color: #fff;
}

/* ===== Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.01em;
}

.nav-brand:hover {
    text-decoration: none;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    color: var(--ink-soft);
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--accent);
    text-decoration: none;
}

/* ===== Layout ===== */
.section-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 88px 0;
}

.section-alt {
    background: var(--surface-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-title {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 32px;
}

.education-title {
    margin-top: 72px;
}

/* ===== Hero ===== */
.hero {
    padding: 120px 0 100px;
}

.hero-eyebrow {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.hero h1 {
    font-size: clamp(2.4rem, 6vw, 3.6rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-lead {
    font-size: 1.2rem;
    color: var(--ink-soft);
    max-width: 620px;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-dark);
}

.btn-secondary {
    background: var(--surface);
    color: var(--ink);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ===== About ===== */
.about-grid {
    display: grid;
    gap: 20px;
    font-size: 1.05rem;
    color: var(--ink-soft);
    max-width: 680px;
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 28px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-bottom: 44px;
}

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

.timeline-marker {
    position: absolute;
    left: -28px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--surface);
    border: 3px solid var(--accent);
}

.timeline-date {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.timeline-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.timeline-company {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.timeline-content > p:last-child {
    color: var(--ink-soft);
    max-width: 640px;
}

/* ===== Skills ===== */
.skills-groups {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 32px;
}

.skills-group h3 {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
    margin-bottom: 14px;
}

.skills-list {
    list-style: none;
}

.skills-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    color: var(--ink-soft);
    font-size: 0.98rem;
}

.skills-list li:last-child {
    border-bottom: none;
}

/* ===== Contact ===== */
.contact-inner {
    text-align: center;
}

.contact-text {
    color: var(--ink-soft);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.contact-links {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Footer ===== */
.site-footer {
    padding: 32px 24px;
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
}

/* ===== Scroll Reveal ===== */
.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .nav-links {
        gap: 18px;
    }

    .nav-links a {
        font-size: 0.88rem;
    }

    .hero {
        padding: 80px 0 64px;
    }

    .section {
        padding: 64px 0;
    }
}