:root {
    --accent: #2A2A2A;
    --accent-dark: #1A1A1A;
    --accent-light: #6E6E6E;
    --accent-secondary: #37474F;
    --surface-bg: #F5F5F5;
    --surface-card: #FFFFFF;
    --surface-alt: #EFEFEF;
    --text-primary: #1C1C1C;
    --text-secondary: #4A4A4A;
    --text-muted: #8A8A8A;
    --border: #E2E2E2;
    --success: #2E7D32;
    --warning: #E65100;
    --danger: #B71C1C;
    --info: #1565C0;
}

body {
    background: var(--surface-bg);
    color: var(--text-primary);
    font-family: "Segoe UI", Roboto, Arial, sans-serif;
}

.navbar {
    background: linear-gradient(90deg, var(--accent-dark) 0%, var(--accent) 100%) !important;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 4px 18px rgba(0,0,0,0.16);
}

.navbar-brand,
.navbar .btn-outline-light,
.navbar .btn-success {
    color: #fff;
}

.navbar .btn-outline-light {
    border-color: rgba(255,255,255,0.22);
}

.navbar .btn-outline-light:hover {
    background: rgba(255,255,255,0.14);
    color: #fff;
}

.card,
.table,
.alert,
.form-control,
.form-select,
.form-check-input {
    border-color: var(--border);
}

.card {
    border: none;
    border-radius: 14px;
    box-shadow: 0 10px 24px rgba(0,0,0,0.06);
}

.card-header {
    background: var(--surface-card) !important;
    border-bottom: 1px solid var(--border);
}

.btn-primary,
.btn-success,
.btn-danger,
.btn-outline-primary,
.btn-outline-secondary,
.btn-outline-light {
    border-radius: 10px;
    transition: all 0.2s ease;
}

.btn-primary,
.btn-success {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-primary:hover,
.btn-success:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    color: #fff;
}

.btn-outline-primary {
    color: var(--accent);
    border-color: var(--accent);
}

.btn-outline-primary:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.table thead th {
    background: var(--accent-secondary);
    color: #fff;
    border: none;
}

.table-hover tbody tr:hover {
    background: var(--surface-alt);
}

.badge-active,
.badge-success {
    background: #EAF7F0;
    color: var(--success);
}

.badge-expired,
.badge-warning {
    background: #FFF4E8;
    color: var(--warning);
}

.badge-revoked,
.badge-danger {
    background: #FCEBEB;
    color: var(--danger);
}

.key-box,
.pem-box {
    background: #1F2327;
    color: #D7F5CC;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.08);
}

.form-control:focus,
.form-select:focus,
.form-check-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 0.2rem rgba(42,42,42,0.15);
}

.brand-logo img {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    border: 3px solid var(--accent);
    background: #fff;
    padding: 4px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.14);
    object-fit: cover;
}

.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top left, #3E3E3E 0%, var(--accent-dark) 35%, #111 100%);
}

.login-card {
    border: none;
    border-radius: 18px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.32);
    width: 400px;
    background: rgba(255,255,255,0.97);
}

.app-shell {
    display: flex;
    min-height: 100vh;
    background: var(--surface-bg);
}

.sidebar {
    width: 250px;
    background: linear-gradient(180deg, var(--accent-dark) 0%, var(--accent) 100%);
    color: #fff;
    padding: 24px 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    margin-bottom: 22px;
}

.sidebar .brand img {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: #fff;
    padding: 4px;
}

.sidebar-link {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 10px;
    transition: background 0.2s ease;
}

.sidebar-link:hover,
.sidebar-link.active {
    background: rgba(255,255,255,0.16);
    color: #fff;
}

.main-panel {
    flex: 1;
    padding: 24px;
}

.page-shell {
    max-width: 760px;
}

.status-pill {
    border-radius: 999px;
    padding: 0.35rem 0.7rem;
    font-weight: 600;
}

.text-purple {
    color: #6a1b9a;
}