:root {
    --am-page-bg: #f7f8fa;
    --am-surface: #ffffff;
    --am-surface-soft: #f9fafb;
    --am-border: #e5e7eb;
    --am-border-strong: #d1d5db;
    --am-text: #111827;
    --am-muted: #6b7280;
    --am-muted-strong: #4b5563;
    --am-primary: #2563eb;
    --am-primary-hover: #1d4ed8;
    --am-danger: #dc2626;
    --am-danger-hover: #b91c1c;
    --am-success: #16a34a;
    --am-radius-sm: 0.5rem;
    --am-radius-md: 0.75rem;
    --am-radius-lg: 1rem;
    --am-shadow-card: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
    --am-shadow-soft: 0 1px 2px rgba(16, 24, 40, 0.05);
}

html {
    background: var(--am-page-bg);
}

body {
    background: var(--am-page-bg);
    color: var(--am-text);
    font-size: 0.95rem;
}

/* Navbar: quiet enterprise / Apple-Salesforce style */
.navbar {
    background: rgba(255, 255, 255, 0.92) !important;
    border-bottom: 1px solid var(--am-border) !important;
    box-shadow: none;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.navbar .container {
    min-height: 4rem;
}

.navbar-brand {
    color: var(--am-text) !important;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.navbar-brand::before {
    content: none !important;
}

.navbar .ms-auto {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar form.d-inline {
    margin: 0;
}

/* Buttons: refined, not flashy */
.btn {
    border-radius: var(--am-radius-sm);
    font-weight: 600;
    box-shadow: none !important;
    transition: background-color 140ms ease, border-color 140ms ease, color 140ms ease;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.875rem;
}

.btn-primary {
    background: var(--am-primary);
    border-color: var(--am-primary);
    color: #ffffff;
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--am-primary-hover);
    border-color: var(--am-primary-hover);
    color: #ffffff;
}

.btn-outline-primary,
.btn-outline-secondary {
    background: #ffffff;
    border-color: var(--am-border-strong);
    color: var(--am-muted-strong);
}

.btn-outline-primary:hover,
.btn-outline-secondary:hover {
    background: var(--am-surface-soft);
    border-color: var(--am-border-strong);
    color: var(--am-text);
}

.btn-outline-danger {
    background: #ffffff;
    border-color: #fecaca;
    color: var(--am-danger);
}

.btn-outline-danger:hover {
    background: #fef2f2;
    border-color: #fca5a5;
    color: var(--am-danger-hover);
}

/* Cards: premium admin-app feel */
.card {
    border: 1px solid var(--am-border);
    border-radius: var(--am-radius-lg);
    box-shadow: var(--am-shadow-card) !important;
    background: var(--am-surface);
}

.card-header {
    border-bottom: 1px solid var(--am-border);
    border-radius: var(--am-radius-lg) var(--am-radius-lg) 0 0 !important;
    padding: 1rem 1.25rem;
}

.card-body {
    padding: 1.25rem;
}

.card h1,
.card h2 {
    letter-spacing: -0.025em;
    font-weight: 700;
}

/* Forms */
.form-label {
    color: var(--am-muted-strong);
    font-weight: 600;
    font-size: 0.9rem;
}

.form-control,
.form-select {
    border-color: var(--am-border-strong);
    border-radius: var(--am-radius-sm);
    box-shadow: none;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--am-primary);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.12);
}

/* Alerts: modern but restrained */
.alert {
    border: 1px solid var(--am-border);
    border-radius: var(--am-radius-md);
    background: #ffffff;
    box-shadow: var(--am-shadow-soft);
    padding: 1rem 1.15rem;
    position: relative;
    overflow: hidden;
    color: var(--am-text);
}

.alert::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 0.25rem;
    height: 100%;
}

.alert strong {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.25rem;
}

.alert ul {
    margin-top: 0.4rem;
    margin-bottom: 0;
    padding-left: 1.1rem;
}

.alert li {
    color: var(--am-muted);
    line-height: 1.45;
}

.alert li + li {
    margin-top: 0.2rem;
}

.alert-success {
    background: #ffffff;
    color: #14532d;
}

.alert-success::before {
    background: var(--am-success);
}

.alert-success::after {
    content: "✓";
    position: absolute;
    top: 0.85rem;
    right: 1rem;
    color: var(--am-success);
    font-weight: 800;
}

.alert-danger {
    background: #ffffff;
    color: #7f1d1d;
}

.alert-danger::before {
    background: var(--am-danger);
}

.alert-danger::after {
    content: "!";
    position: absolute;
    top: 0.85rem;
    right: 1rem;
    color: var(--am-danger);
    font-weight: 800;
}

.alert-warning {
    background: #ffffff;
    color: #78350f;
}

.alert-warning::before {
    background: #f59e0b;
}

.alert-info {
    background: #ffffff;
    color: #1e3a8a;
}

.alert-info::before {
    background: #2563eb;
}

/* Page spacing */
main.container {
    padding-top: 0.5rem;
    padding-bottom: 3rem;
}