:root {
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #ede9fe;
    --success: #16a34a;
    --success-light: #dcfce7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --warning: #d97706;
    --warning-light: #fef3c7;
    --info: #0284c7;
    --info-light: #e0f2fe;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,.08), 0 4px 6px rgba(0,0,0,.05);
}

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

body {
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    font-size: 15px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ─────────────────────────────────── */
.layout { display: flex; min-height: 100vh; }

.sidebar {
    width: 240px;
    background: var(--gray-900);
    color: #fff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-brand {
    padding: 20px 20px 16px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.sidebar-brand h1 {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    letter-spacing: -.3px;
}
.sidebar-brand span {
    font-size: 11px;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: .5px;
}

.sidebar-nav { flex: 1; padding: 12px 0; }
.sidebar-section {
    padding: 8px 12px 4px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .8px;
    color: var(--gray-500);
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 16px;
    color: var(--gray-300);
    font-size: 14px;
    font-weight: 500;
    border-radius: 0;
    transition: background .15s, color .15s;
}
.nav-item:hover { background: rgba(255,255,255,.06); color: #fff; text-decoration: none; }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-item svg { width: 18px; height: 18px; flex-shrink: 0; opacity: .8; }

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid rgba(255,255,255,.08);
    font-size: 13px;
    color: var(--gray-400);
}
.sidebar-footer strong { display: block; color: var(--gray-200); }

.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

.topbar {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 14px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}
.topbar h2 { font-size: 18px; font-weight: 700; color: var(--gray-900); }
.topbar-actions { display: flex; gap: 10px; align-items: center; }

.content { flex: 1; padding: 28px; overflow-y: auto; }

/* ── Auth pages ─────────────────────────────── */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gray-900) 0%, #312e81 100%);
    padding: 20px;
}
.auth-card {
    background: #fff;
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
}
.auth-logo {
    text-align: center;
    margin-bottom: 28px;
}
.auth-logo h1 { font-size: 26px; font-weight: 800; color: var(--primary); }
.auth-logo p { color: var(--gray-500); font-size: 14px; margin-top: 4px; }

/* ── Cards ──────────────────────────────────── */
.card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-header h3 { font-size: 15px; font-weight: 600; color: var(--gray-900); }
.card-body { padding: 20px; }
.card-footer { padding: 12px 20px; border-top: 1px solid var(--gray-200); background: var(--gray-50); border-radius: 0 0 var(--radius) var(--radius); }

/* ── Stats ──────────────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}
.stat-card .stat-label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; color: var(--gray-500); }
.stat-card .stat-value { font-size: 32px; font-weight: 800; color: var(--gray-900); margin: 4px 0; line-height: 1; }
.stat-card .stat-sub { font-size: 13px; color: var(--gray-500); }

/* ── Tables ─────────────────────────────────── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { background: var(--gray-50); padding: 10px 14px; text-align: left; font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; color: var(--gray-500); border-bottom: 1px solid var(--gray-200); white-space: nowrap; }
td { padding: 12px 14px; border-bottom: 1px solid var(--gray-100); color: var(--gray-700); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--gray-50); }

/* ── Forms ──────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--gray-700); margin-bottom: 6px; }
.form-control {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 14px;
    color: var(--gray-800);
    background: #fff;
    transition: border-color .15s, box-shadow .15s;
    line-height: 1.5;
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,.12); }
.form-control::placeholder { color: var(--gray-400); }
textarea.form-control { resize: vertical; min-height: 80px; }
.form-hint { font-size: 12px; color: var(--gray-500); margin-top: 4px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ── Buttons ────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background .15s, opacity .15s, box-shadow .15s;
    white-space: nowrap;
    text-decoration: none;
}
.btn:hover { text-decoration: none; opacity: .92; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); opacity: 1; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-outline { background: transparent; color: var(--gray-700); border: 1px solid var(--gray-300); }
.btn-outline:hover { background: var(--gray-100); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-lg { padding: 11px 22px; font-size: 15px; }
.btn-block { width: 100%; justify-content: center; }

/* ── Badges ─────────────────────────────────── */
.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .3px;
}
.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger  { background: var(--danger-light);  color: var(--danger);  }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-info    { background: var(--info-light);    color: var(--info);    }
.badge-gray    { background: var(--gray-100);      color: var(--gray-600); }
.badge-primary { background: var(--primary-light); color: var(--primary); }

/* ── Alerts ─────────────────────────────────── */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    border-left: 4px solid;
    margin-bottom: 20px;
}
.alert-success { background: var(--success-light); border-color: var(--success); color: var(--success); }
.alert-error   { background: var(--danger-light);  border-color: var(--danger);  color: var(--danger);  }
.alert-info    { background: var(--info-light);    border-color: var(--info);    color: var(--info);    }
.alert-warning { background: var(--warning-light); border-color: var(--warning); color: var(--warning); }

/* ── Key display ────────────────────────────── */
.key-box {
    background: var(--gray-900);
    color: #a5f3fc;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    padding: 14px 16px;
    border-radius: var(--radius);
    word-break: break-all;
    letter-spacing: .5px;
    position: relative;
}
.key-box .copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255,255,255,.1);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 11px;
    cursor: pointer;
}
.key-box .copy-btn:hover { background: rgba(255,255,255,.2); }

/* ── Subscription card ──────────────────────── */
.sub-card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px;
    transition: box-shadow .15s;
}
.sub-card:hover { box-shadow: var(--shadow-md); }
.sub-card.expired { opacity: .65; }
.sub-card .sub-app { font-size: 16px; font-weight: 700; color: var(--gray-900); }
.sub-card .sub-plan { font-size: 13px; color: var(--gray-500); margin-top: 2px; }
.sub-card .sub-expiry { font-size: 12px; color: var(--gray-500); margin-top: 8px; }

/* ── Plan card ──────────────────────────────── */
.plan-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.plan-card {
    background: #fff;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: border-color .2s, box-shadow .2s;
}
.plan-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.plan-card .plan-name { font-size: 17px; font-weight: 700; color: var(--gray-900); }
.plan-card .plan-price { font-size: 28px; font-weight: 800; color: var(--primary); }
.plan-card .plan-price sup { font-size: 16px; font-weight: 600; }
.plan-card .plan-price small { font-size: 13px; font-weight: 400; color: var(--gray-500); }
.plan-card .plan-duration { font-size: 13px; color: var(--gray-500); }
.plan-card .plan-desc { font-size: 14px; color: var(--gray-600); flex: 1; }

/* ── Misc ───────────────────────────────────── */
.page-header { margin-bottom: 24px; }
.page-header h2 { font-size: 22px; font-weight: 800; color: var(--gray-900); }
.page-header p { color: var(--gray-500); font-size: 14px; margin-top: 4px; }
.section-title { font-size: 14px; font-weight: 700; color: var(--gray-700); margin-bottom: 14px; }
.empty-state { text-align: center; padding: 48px 24px; color: var(--gray-400); }
.empty-state svg { width: 48px; height: 48px; margin: 0 auto 16px; opacity: .4; }
.empty-state p { font-size: 15px; }
.divider { border: none; border-top: 1px solid var(--gray-200); margin: 20px 0; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mt-4 { margin-top: 16px; }
.text-sm { font-size: 13px; }
.text-xs { font-size: 11px; }
.text-gray { color: var(--gray-500); }
.text-mono { font-family: 'Courier New', monospace; font-size: 13px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }

@media (max-width: 768px) {
    .sidebar { display: none; }
    .form-row, .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .content { padding: 16px; }
}