/* ===== COLOURS ===== */
:root {
    --colour-primary: #1e3a8a;
    --colour-primary-hover: #172554;
    --colour-primary-text: #ffffff;
    --colour-primary-soft: #eef2ff;
    --colour-bg: #f1f4f8;
    --colour-card: #ffffff;
    --colour-border: #dbe2ea;
    --colour-text: #0f172a;
    --colour-text-muted: #64748b;
    --colour-input-bg: #ffffff;
    --colour-focus: #2563eb;
    --colour-error: #dc2626;
    --colour-success: #15803d;

    --header-bg: #1e3a8a;
    --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-raised: 0 4px 16px rgba(15, 23, 42, 0.08);
    --radius: 10px;
    --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* ===== RESET ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
[hidden] { display: none !important; }
body {
    font-family: var(--font);
    background-color: var(--colour-bg);
    color: var(--colour-text);
    line-height: 1.5;
    min-height: 100vh;
}
svg.icon {
    width: 1.35rem;
    height: 1.35rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}

/* ===== BUTTONS ===== */
.btn-primary {
    width: 100%;
    padding: 1rem;
    font-size: 1.05rem;
    font-weight: 600;
    font-family: inherit;
    color: var(--colour-primary-text);
    background-color: var(--colour-primary);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.2s, opacity 0.2s;
}
.btn-primary:hover { background-color: var(--colour-primary-hover); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-secondary {
    display: block;
    width: 100%;
    padding: 0.9rem 1rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    text-align: center;
    text-decoration: none;
    color: var(--colour-primary);
    background-color: var(--colour-card);
    border: 1px solid var(--colour-border);
    border-radius: var(--radius);
    cursor: pointer;
}
.btn-secondary:hover { border-color: var(--colour-primary); }

.btn-light {
    padding: 0.5rem 0.95rem;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    color: #ffffff;
    background-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.2s;
}
.btn-light:hover { background-color: rgba(255, 255, 255, 0.1); }