/* ============================================================
   Felix Esperson — Portfolio Shared Stylesheet
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
    --color-bg:        #f9fafb;
    --color-dark:      #0b0f19;
    --color-primary:   #0d6efd;
    --color-muted:     #6c757d;
    --color-border:    #dee2e6;
    --color-surface:   #ffffff;
    --color-nav-bg:    #f3f6ff;

    --font-body:    'Lora', Georgia, serif;
    --font-heading: 'Inter', system-ui, sans-serif;

    --radius:   0.5rem;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 1rem 2rem rgba(0,0,0,0.08);
    --max-width: 860px;
}

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

body {
    background-color: var(--color-bg);
    color: var(--color-dark);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.75;
}

/* ---------- Navbar ---------- */
.navbar-portfolio {
    background-color: var(--color-nav-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0.75rem 0;
}

.navbar-portfolio .container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.navbar-brand {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-dark);
    text-decoration: none;
}

.navbar-links {
    display: flex;
    gap: 0.5rem;
    list-style: none;
    flex-wrap: wrap;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.75rem;
    border: 1px solid var(--color-dark);
    border-radius: var(--radius);
    color: var(--color-dark);
    text-decoration: none;
    font-family: var(--font-heading);
    font-size: 0.875rem;
    transition: background 0.15s, color 0.15s;
}

.btn-icon:hover {
    background-color: var(--color-dark);
    color: #fff;
}

.btn-icon svg { width: 1rem; height: 1rem; }

/* ---------- Page Hero ---------- */
.page-hero {
    border-bottom: 1px solid var(--color-border);
    padding: 3.5rem 1.5rem 2.5rem;
    text-align: center;
    background: var(--color-surface);
}

.page-hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-hero .byline {
    color: var(--color-muted);
    font-size: 0.95rem;
}

/* ---------- Article Layout ---------- */
.article-body {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem 1.5rem 5rem;
}

/* ---------- Typography ---------- */
.article-body h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    margin: 2.75rem 0 0.75rem;
    padding-bottom: 0.35rem;
    border-bottom: 2px solid var(--color-border);
}

.article-body h3 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 600;
    margin: 2rem 0 0.5rem;
    color: var(--color-dark);
}

.article-body p {
    margin-bottom: 1.2rem;
    color: #2c2f36;
}

.article-body hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2.5rem 0;
}

/* ---------- Figures ---------- */
.article-body figure {
    margin: 2rem 0;
    text-align: center;
}

.article-body figure img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.article-body figcaption {
    margin-top: 0.6rem;
    font-size: 0.85rem;
    color: var(--color-muted);
    font-style: italic;
}

/* ---------- Tables ---------- */
.article-body table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    margin: 1.5rem 0 2rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    font-family: var(--font-heading);
}

.article-body thead {
    background-color: var(--color-dark);
    color: #fff;
}

.article-body thead th {
    padding: 0.65rem 0.85rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.article-body tbody tr:nth-child(even) {
    background-color: #f3f6ff;
}

.article-body tbody td {
    padding: 0.6rem 0.85rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
}

.article-body tbody tr:last-child td {
    border-bottom: none;
}

/* ---------- References ---------- */
.article-body .references p {
    font-size: 0.9rem;
    color: #444;
    padding-left: 1.5rem;
    text-indent: -1.5rem;
}

/* ---------- Back Link ---------- */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-heading);
    font-size: 0.875rem;
    color: var(--color-muted);
    text-decoration: none;
    margin-bottom: 2.5rem;
    transition: color 0.15s;
}

.back-link:hover { color: var(--color-dark); }

/* ---------- Footer ---------- */
footer.site-footer {
    background-color: var(--color-dark);
    color: #adb5bd;
    text-align: center;
    padding: 1.5rem;
    font-family: var(--font-heading);
    font-size: 0.85rem;
}