:root {
    --bg-color: #ffffff;        /* Soft off-white */
    --card-bg: #ffffff;         /* Pure white for cards */
    --text-color: #1e293b;      /* Dark slate for text */
    --primary: #0284c7;         /* Professional Blue */
    --accent: #0ea5e9;          /* Lighter blue for hover */
    --border-color: #e2e8f0;    /* Light grey borders */
    --secondary-text: #64748b;  /* Grey for dates/roles */
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 20px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

nav {
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    transition: color 0.2s;
}

nav a:hover {
    color: var(--primary);
}

h1, h2, h3 {
    color: #0f172a;
}

.pub-year {
    display: block;
    font-weight: bold;
    color: var(--primary);
    margin: 30px 0 10px 0;
    font-size: 1.2rem;
    border-bottom: 2px solid var(--primary);
    width: fit-content;
}

/* Center the content inside the preloader */
.loader-content {
    text-align: center;
}

.loader-text {
    margin-top: 15px;
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--primary);
    letter-spacing: 2px;
}

.loader-subtext {
    font-size: 0.8rem;
    color: var(--secondary-text);
    margin-top: 5px;
}

/* Ensure the spinner and text fade out together */
#preloader {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: #f8fafc;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000; /* Higher than Nav */
    transition: opacity 3s ease, visibility 5s ease;
}

.loader-hidden {
    opacity: 0;
    visibility: hidden;
}