/* ===== CSS Reset ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* ===== CSS Variables ===== */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #f59e0b;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --radius: 0.5rem;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.06);
}

/* ===== Body Typography ===== */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
        Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    color: var(--gray-800);
    background-color: var(--gray-50);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== Sticky Nav ===== */
.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.25rem;
    background-color: var(--gray-800);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.15rem;
    color: #fff;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-links a {
    color: var(--gray-200);
    text-decoration: none;
    font-size: 0.9rem;
}

.nav-links a:hover {
    color: #fff;
}

.nav-logout {
    color: var(--gray-400) !important;
}

/* ===== Content ===== */
.content {
    padding: 1.5rem 1rem;
    max-width: 960px;
    margin: 0 auto;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.55rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: opacity 0.15s ease;
}

.btn:hover {
    opacity: 0.85;
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
}

.btn-success {
    background-color: var(--success);
    color: #fff;
}

.btn-danger {
    background-color: var(--danger);
    color: #fff;
}

.btn-sm {
    padding: 0.3rem 0.75rem;
    font-size: 0.8rem;
}

/* ===== Cards ===== */
.card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.35rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.55rem 0.75rem;
    font-size: 0.95rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: #fff;
    color: var(--gray-800);
    transition: border-color 0.15s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group textarea {
    resize: vertical;
}

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-pending {
    background-color: var(--warning);
    color: #fff;
}

.badge-approved {
    background-color: var(--success);
    color: #fff;
}

.badge-denied {
    background-color: var(--danger);
    color: #fff;
}

.badge-wfh {
    background-color: var(--primary);
    color: #fff;
}

.badge-unpaid {
    background-color: var(--gray-500);
    color: #fff;
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.text-sm { font-size: 0.85rem; }
.text-muted { color: var(--gray-500); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }

.hidden { display: none; }

/* ===== HUD-Core Loading State ===== */
[loading] {
    opacity: 0.5;
    pointer-events: none;
}

/* ===== Desktop Breakpoint ===== */
@media (min-width: 768px) {
    .content {
        padding: 2rem 2rem;
    }
}