/* =========================================
   Bernard Fatoye — Personal Site
   Dark navy theme, clean executive aesthetic
   ========================================= */

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

:root {
    --navy-900: #0f172a;
    --navy-800: #1e293b;
    --navy-700: #334155;
    --navy-600: #475569;
    --slate-400: #94a3b8;
    --slate-300: #cbd5e1;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;
    --white: #ffffff;
    --accent: #38bdf8;
    --accent-hover: #7dd3fc;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', monospace;
    --max-width: 1120px;
    --transition: 0.25s ease;
}

html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--navy-900);
    color: var(--slate-200);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

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

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

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* --- Skip Link --- */
.skip-link {
    position: absolute; top: -100%; left: 16px;
    background: var(--accent); color: var(--navy-900);
    padding: 8px 16px; border-radius: 4px; font-weight: 600; z-index: 100;
}
.skip-link:focus { top: 16px; }

/* --- Header --- */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 50;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(51, 65, 85, 0.4);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.brand {
    font-size: 1.125rem; font-weight: 700; color: var(--white);
    letter-spacing: -0.02em;
}
.brand:hover { color: var(--accent); }

.site-nav { display: flex; gap: 32px; }
.site-nav a {
    color: var(--slate-300); font-size: 0.9rem; font-weight: 500;
    transition: color var(--transition);
}
.site-nav a:hover { color: var(--white); }

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle-bar {
    display: block; width: 24px; height: 2px; background: var(--slate-300);
    margin: 5px 0; transition: var(--transition);
}

/* --- Hero --- */
.hero {
    padding: 140px 0 80px;
    min-height: 85vh;
    display: flex; align-items: center;
}
.hero-inner {
    display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
}
.hero-label {
    font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent);
    letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 16px;
}
.hero h1 {
    font-size: clamp(2rem, 4vw, 3rem); font-weight: 700;
    color: var(--white); line-height: 1.2; letter-spacing: -0.03em;
    margin-bottom: 20px;
}
.hero-sub {
    font-size: 1.1rem; color: var(--slate-400); line-height: 1.7;
    margin-bottom: 32px; max-width: 520px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-photo-wrapper {
    display: flex; justify-content: center;
}
.hero-photo {
    width: 320px; height: 320px; object-fit: cover;
    border-radius: 50%;
    border: 3px solid var(--navy-700);
    box-shadow: 0 0 60px rgba(56, 189, 248, 0.08);
}

/* --- Buttons --- */
.btn {
    display: inline-block; padding: 12px 28px; border-radius: 6px;
    font-size: 0.95rem; font-weight: 600; cursor: pointer;
    transition: all var(--transition); border: 2px solid transparent;
}
.btn-primary {
    background: var(--accent); color: var(--navy-900); border-color: var(--accent);
}
.btn-primary:hover {
    background: var(--accent-hover); border-color: var(--accent-hover); color: var(--navy-900);
}
.btn-secondary {
    background: transparent; color: var(--slate-200); border-color: var(--navy-600);
}
.btn-secondary:hover {
    border-color: var(--slate-300); color: var(--white);
}

/* --- Section Titles --- */
.section-title {
    font-size: 2rem; font-weight: 700; color: var(--white);
    letter-spacing: -0.02em; margin-bottom: 8px;
}
.section-sub {
    color: var(--slate-400); font-size: 1.05rem; margin-bottom: 48px;
    max-width: 560px;
}

/* --- About --- */
.about { padding: 100px 0; }
.about-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start;
}
.about-text p { margin-bottom: 16px; color: var(--slate-300); }
.about-text strong { color: var(--white); }

.about-credentials { display: flex; flex-direction: column; gap: 20px; }
.credential-card {
    background: var(--navy-800); border: 1px solid var(--navy-700);
    border-radius: 10px; padding: 24px;
    transition: border-color var(--transition);
}
.credential-card:hover { border-color: var(--accent); }
.credential-icon { font-size: 1.5rem; display: block; margin-bottom: 8px; }
.credential-card h3 {
    font-size: 1rem; font-weight: 600; color: var(--white); margin-bottom: 6px;
}
.credential-card p { font-size: 0.9rem; color: var(--slate-400); line-height: 1.5; }

/* --- Work / Case Studies --- */
.work {
    padding: 100px 0;
    background: var(--navy-800);
}
.work-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.work-card {
    background: var(--navy-900); border: 1px solid var(--navy-700);
    border-radius: 12px; padding: 32px; display: flex; flex-direction: column;
    transition: all var(--transition); color: var(--slate-300);
}
.work-card:hover {
    border-color: var(--accent); transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
    color: var(--slate-200);
}
.work-card-badge {
    font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent);
    text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 12px;
}
.work-card h3 {
    font-size: 1.3rem; font-weight: 700; color: var(--white); margin-bottom: 12px;
}
.work-card p { font-size: 0.95rem; line-height: 1.6; flex: 1; margin-bottom: 20px; }
.work-card-link {
    font-size: 0.9rem; font-weight: 600; color: var(--accent);
    transition: color var(--transition);
}
.work-card:hover .work-card-link { color: var(--accent-hover); }

/* --- Insights --- */
.insights { padding: 100px 0; }
.insights-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.insight-card {
    background: var(--navy-800); border: 1px solid var(--navy-700);
    border-radius: 12px; padding: 32px;
}
.placeholder-card {
    grid-column: 1 / -1; text-align: center; padding: 60px 32px;
}
.insight-placeholder { font-size: 1.1rem; color: var(--slate-300); margin-bottom: 8px; }
.insight-placeholder-sub { font-size: 0.95rem; color: var(--slate-400); }

/* --- Contact --- */
.contact {
    padding: 100px 0;
    background: var(--navy-800);
}
.contact-grid {
    display: grid; grid-template-columns: 1fr 320px; gap: 64px; align-items: start;
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block; font-size: 0.85rem; font-weight: 600;
    color: var(--slate-300); margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
    width: 100%; padding: 12px 16px; border-radius: 6px;
    background: var(--navy-900); border: 1px solid var(--navy-700);
    color: var(--white); font-size: 0.95rem; font-family: var(--font-sans);
    transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none; border-color: var(--accent);
}
.form-group textarea { resize: vertical; }
.btn-submit { width: 100%; text-align: center; }
.form-status { margin-top: 12px; font-size: 0.9rem; min-height: 1.4em; }
.form-status.success { color: #34d399; }
.form-status.error { color: #f87171; }

.contact-links { display: flex; flex-direction: column; gap: 20px; padding-top: 8px; }
.social-link {
    display: flex; align-items: center; gap: 12px;
    color: var(--slate-300); font-size: 0.95rem; font-weight: 500;
    padding: 16px 20px; border-radius: 8px;
    background: var(--navy-900); border: 1px solid var(--navy-700);
    transition: all var(--transition);
}
.social-link:hover {
    border-color: var(--accent); color: var(--white);
}
.social-link svg { flex-shrink: 0; }

/* --- Footer --- */
.site-footer {
    padding: 32px 0; border-top: 1px solid var(--navy-700);
}
.footer-inner { text-align: center; }
.site-footer p { font-size: 0.85rem; color: var(--slate-400); }

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 900px) {
    .hero-inner { grid-template-columns: 1fr; text-align: center; }
    .hero-sub { max-width: 100%; }
    .hero-actions { justify-content: center; }
    .hero-visual { order: -1; }
    .hero-photo { width: 220px; height: 220px; }

    .about-grid { grid-template-columns: 1fr; }
    .work-grid { grid-template-columns: 1fr; }
    .insights-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .nav-toggle { display: block; }
    .site-nav {
        display: none; position: absolute; top: 64px; left: 0; right: 0;
        background: var(--navy-900); flex-direction: column; gap: 0;
        border-bottom: 1px solid var(--navy-700);
    }
    .site-nav.open { display: flex; }
    .site-nav a { padding: 16px 24px; border-top: 1px solid var(--navy-800); }

    .hero { padding: 120px 0 60px; min-height: auto; }
    .hero h1 { font-size: 1.75rem; }
    .section-title { font-size: 1.5rem; }

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

/* --- Scroll reveal --- */
.reveal {
    opacity: 0; transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
    opacity: 1; transform: translateY(0);
}
.header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}