:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-soft: #eff6ff;
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #16a34a;
    --success-soft: #dcfce7;
    --warning: #d97706;
    --warning-soft: #fef3c7;
    --danger: #dc2626;
    --danger-soft: #fee2e2;
    --radius: 10px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0.85rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.nav-brand {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.925rem;
    transition: color 0.15s;
    padding: 0.35rem 0.65rem;
    border-radius: 6px;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
    background-color: var(--primary-soft);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Container */
.container {
    width: 100%;
    max-width: 1180px;
    margin: 1.75rem auto;
    padding: 0 1rem;
    flex: 1;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.stat-card .label {
    font-size: 0.825rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.stat-card .value {
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--text-main);
}

.stat-card .meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

/* Cards & Sections */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    width: 100%;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    text-align: left;
}

th {
    background-color: #f1f5f9;
    color: #475569;
    font-weight: 600;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
}

td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

tr:hover td {
    background-color: #f8fafc;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
}

.badge-active { background-color: var(--success-soft); color: var(--success); }
.badge-paused { background-color: var(--warning-soft); color: var(--warning); }
.badge-banned { background-color: var(--danger-soft); color: var(--danger); }
.badge-pending { background-color: #f1f5f9; color: var(--text-muted); }
.badge-sent { background-color: var(--success-soft); color: var(--success); }
.badge-deleted { background-color: #f1f5f9; color: var(--text-muted); }
.badge-removed_early { background-color: var(--danger-soft); color: var(--danger); }

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 0.65rem 0.85rem;
    font-size: 0.925rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #ffffff;
    color: var(--text-main);
    transition: border-color 0.15s, box-shadow 0.15s;
}

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

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

.form-help {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.55rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 6px;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

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

.btn-secondary { background-color: #f1f5f9; color: #334155; border-color: var(--border); }
.btn-secondary:hover { background-color: #e2e8f0; }

.btn-danger { background-color: var(--danger); color: #fff; }
.btn-danger:hover { background-color: #b91c1c; }

.btn-warning { background-color: var(--warning); color: #fff; }
.btn-warning:hover { background-color: #b45309; }

.btn-success { background-color: var(--success); color: #fff; }
.btn-success:hover { background-color: #15803d; }

.btn-sm {
    padding: 0.3rem 0.55rem;
    font-size: 0.775rem;
}

/* Alerts */
.alert {
    padding: 0.85rem 1.15rem;
    border-radius: 6px;
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.alert-success { background-color: var(--success-soft); color: var(--success); border: 1px solid #bbf7d0; }
.alert-danger { background-color: var(--danger-soft); color: var(--danger); border: 1px solid #fecaca; }
.alert-warning { background-color: var(--warning-soft); color: var(--warning); border: 1px solid #fde68a; }

/* Login Box */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f1f5f9;
    padding: 1rem;
}

.login-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.25rem;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow);
}

.login-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
    text-align: center;
}

.login-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.75rem;
    text-align: center;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 1.25rem;
    text-align: center;
    font-size: 0.825rem;
    color: var(--text-muted);
    background-color: var(--card-bg);
    margin-top: auto;
}