/* COLOR PALETTE (From Grenoble INP - ESISAR Graphic Chart)
   Institutional Blue: #2A2E46
   Esisar Magenta:      #951B81 
*/
:root {
    --primary-blue: #2A2E46;
    --esisar-magenta: #951B81;
    
    /* Light Mode defaults */
    --bg-color: #f4f5f7;
    --card-bg: #ffffff;
    --text-color: #1a1c24;
    --text-muted: #5c6175;
    --border-color: #d1d5db;
    --header-bg: var(--primary-blue);
    --header-text: #ffffff;
}

/* Dark Mode overrides */
[data-theme="dark"] {
    --bg-color: #12131a;
    --card-bg: #1a1c24;
    --text-color: #f4f5f7;
    --text-muted: #a0a6b8;
    --border-color: #2d3142;
    --header-bg: #1c1e2b;
    --header-text: #f4f5f7;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 40px 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

/* Top Action Bar (Theme Switcher) */
.top-bar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 15px;
}

.theme-toggle-btn {
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.theme-toggle-btn:hover {
    border-color: var(--esisar-magenta);
}

/* Header / Info Section */
header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 40px;
    border-bottom: 4px solid var(--esisar-magenta);
}

.header-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    padding-bottom: 15px;
    margin-bottom: 15px;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.server-status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: #ffffff;
}

[data-theme="dark"] .server-status {
    background: rgba(149, 27, 129, 0.2);
    color: #f4f5f7;
}

.status-dot {
    width: 9px;
    height: 9px;
    background-color: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 8px #10b981;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.95rem;
}

.contact-info div {
    opacity: 0.9;
}

.contact-info a {
    color: #ffffff;
    text-decoration: underline;
    text-decoration-color: var(--esisar-magenta);
    text-underline-offset: 3px;
}

.contact-info a:hover {
    color: var(--esisar-magenta);
    text-decoration-color: #ffffff;
}

/* Content Sections */
.section-title {
    font-size: 1.3rem;
    color: var(--text-color);
    margin-bottom: 20px;
    border-left: 4px solid var(--esisar-magenta);
    padding-left: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grid-section {
    margin-bottom: 40px;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

/* Interactive Link Cards */
.card {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.03);
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.08);
    border-color: var(--esisar-magenta);
}

.card h3 {
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.card:hover h3 {
    color: var(--esisar-magenta);
}

.card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 60px;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

/* Responsive handling */
@media (max-width: 600px) {
    body { padding: 20px 10px; }
    header { padding: 20px; }
    h1 { font-size: 1.6rem; }
    .header-main { gap: 10px; }
}