:root {
    --primary-color: #1e293b;
    --secondary-color: #3b82f6;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-accent: #f1f5f9;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1);
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 20px;
    --spacing-xl: 28px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

*, *::before, *::after { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    /* Pas d'overflow:hidden — on laisse défiler si la fenêtre est trop petite */
}

/* ── Header ── */
.site-header {
    text-align: center;
    padding: 36px 24px 24px;
    background: linear-gradient(180deg, #fff 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.site-header h1 {
    font-size: clamp(1.6rem, 4vw, 2.8rem);
    font-weight: 300;
    letter-spacing: -0.025em;
    color: var(--text-primary);
    margin: 0 0 8px;
    line-height: 1.1;
}

.site-header p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0 auto;
    max-width: 520px;
}

/* ── Cards grid ── */
.overview-section {
    flex: 1;
    padding: 24px 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.overview-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 16px;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    max-width: 1100px;
    margin-inline: auto;
    width: 100%;
}

.overview-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 18px;
    cursor: pointer;
    text-decoration: none;
    display: block;
    transition: all 0.22s ease;
    position: relative;
    overflow: hidden;
}

.overview-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--card-accent, var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.28s ease;
}

.overview-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(0,0,0,0.09);
    border-color: transparent;
}

.overview-card:hover::before { transform: scaleX(1); }

.overview-card-icon {
    width: 36px; height: 36px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--card-accent, var(--secondary-color)) 12%, transparent);
    border-radius: 8px;
    color: var(--card-accent, var(--secondary-color));
}

.overview-card-icon svg {
    width: 20px; height: 20px;
    stroke: currentColor;
    stroke-width: 1.75;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.overview-card-tag {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--card-accent, var(--secondary-color));
    margin-bottom: 4px;
}

.overview-card-title {
    font-size: 0.975rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 6px;
    line-height: 1.3;
}

.overview-card-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.overview-card-links {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.overview-card-link {
    font-size: 0.7rem;
    color: var(--card-accent, var(--secondary-color));
    background: color-mix(in srgb, var(--card-accent, var(--secondary-color)) 10%, transparent);
    border-radius: 4px;
    padding: 2px 7px;
    font-weight: 500;
}

.overview-card-arrow {
    position: absolute;
    bottom: 14px; right: 14px;
    width: 20px; height: 20px;
    color: var(--card-accent);
    opacity: 0;
    transform: translateX(-4px);
    transition: all 0.22s ease;
}
.overview-card-arrow svg {
    width: 100%; height: 100%;
    stroke: currentColor; fill: none;
    stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.overview-card:hover .overview-card-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* ── Footer discret, fondu dans la page ── */
footer {
    text-align: center;
    padding: 10px 20px;
    background: var(--bg-secondary);
    color: var(--text-muted);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    flex-shrink: 0;
    border-top: 1px solid var(--border-color);
}

/* ── Responsive ── */
@media (max-width: 900px) {
    .overview-grid { grid-template-columns: repeat(2, 1fr); }
    .overview-section { justify-content: flex-start; padding-top: 20px; }
}

@media (max-width: 560px) {
    .overview-grid { grid-template-columns: 1fr; }
    .site-header { padding: 24px 16px 16px; }
    .overview-section { padding: 16px; }
}