/* =====================
   Global Styles
   ===================== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #2c3e50;
    --accent: #c0392b;
    --light-bg: #f9f7f4;
    --text: #333333;
    --text-light: #666666;
    --border: #e0dbd4;
    --white: #ffffff;
    --font-sans: 'Source Sans Pro', Arial, sans-serif;
}

body {
    font-family: var(--font-sans);
    color: var(--text);
    background-color: var(--white);
    line-height: 1.7;
}

/* =====================
   Navbar
   ===================== */
header {
    background-color: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.06);
}

nav {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    height: 60px;
}

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

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 400;
    padding: 0.4rem 0.9rem;
    border-radius: 4px;
    transition: background-color 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background-color: var(--light-bg);
}

/* =====================
   Hero / Home
   ===================== */
.hero {
    padding: 4rem 2rem;
    background-color: var(--white);
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.hero-content img {
    max-width: 280px;
    width: 100%;
    display: block;
    margin: 0 auto 2rem;
}

.page-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.bio {
    font-size: 1rem;
    color: var(--text);
    text-align: left;
    max-width: 640px;
    margin: 0 auto;
}

/* =====================
   Page Header
   ===================== */
.page-header {
    padding: 2.5rem 2rem;
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    text-align: center;
}

.page-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
}

/* =====================
   Cards (Teaching)
   ===================== */
.card {
    background-color: var(--white);
    border: 1px solid var(--border);
    border-radius: 4px;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.card-text {
    font-size: 0.95rem;
    color: var(--text);
    margin-bottom: 1.2rem;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1.2rem;
    background-color: #0d6efd;
    color: var(--white);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.btn:hover { background-color: #0b5ed7; }

/* =====================
   News
   ===================== */
.news-empty {
    text-align: center;
    color: var(--text-light);
    padding: 4rem 2rem;
    font-size: 1rem;
}

/* =====================
   Footer
   ===================== */
footer {
    background-color: var(--white);
    border-top: 1px solid var(--border);
    color: var(--text-light);
    text-align: center;
    padding: 1.5rem;
    font-size: 0.85rem;
}

/* =====================
   Responsive
   ===================== */
@media (max-width: 768px) {
    nav { justify-content: center; }
    .nav-links { gap: 0; flex-wrap: wrap; justify-content: center; }
    .page-title { font-size: 1.4rem; }
}