:root {
    --c-primary:       #0F62FE;
    --c-primary-dark:  #0043CE;
    --c-primary-light: #EDF4FF;
    --c-green:         #15803D;
    --c-green-light:   #DCFCE7;
    --c-red:           #B91C1C;
    --c-red-light:     #FEF2F2;
    --c-amber:         #B45309;
    --c-amber-light:   #FEF3C7;

    --c-sidebar:       #0B1220;
    --c-bg:            #F4F6F9;
    --c-surface:       #FFFFFF;
    --c-border:        #E4E8EF;
    --c-text:          #11151C;
    --c-text-secondary:#5B6472;
    --c-text-disabled: #9AA3B2;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-md: 0 4px 12px rgba(15,23,42,.08), 0 2px 6px rgba(15,23,42,.05);
    --shadow-lg: 0 10px 30px rgba(15,23,42,.12);
    --font-base: 'Inter', 'Plus Jakarta Sans', sans-serif;
    --transition: .18s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 14px; }
body { font-family: var(--font-base); background: var(--c-bg); color: var(--c-text); }
a { color: inherit; text-decoration: none; }
button, input, select { font-family: inherit; }

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

.sidebar {
    width: 230px;
    background: var(--c-sidebar);
    color: #fff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-brand { padding: 22px 20px; display: flex; align-items: center; gap: 10px; }
.sidebar-brand-icon {
    width: 36px; height: 36px; border-radius: var(--radius-sm);
    background: var(--c-primary); display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 14px;
}
.sidebar-brand-name { font-weight: 700; font-size: 15px; }
.sidebar-brand-sub  { font-size: 11px; opacity: .6; }

.sidebar-nav { display: flex; flex-direction: column; padding: 8px 12px; gap: 2px; flex: 1; }
.nav-item {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 12px; border-radius: var(--radius-sm);
    color: rgba(255,255,255,.75); font-size: 13px; font-weight: 500;
    transition: background var(--transition), color var(--transition);
}
.nav-item:hover  { background: rgba(255,255,255,.06); color: #fff; }
.nav-item.active { background: var(--c-primary); color: #fff; }

.sidebar-footer { padding: 16px 20px; border-top: 1px solid rgba(255,255,255,.08); }
.env-badge {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 11px; font-weight: 700; padding: 4px 10px;
    border-radius: 20px; background: var(--c-amber-light); color: var(--c-amber);
}

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.topbar {
    height: 60px; background: var(--c-surface); border-bottom: 1px solid var(--c-border);
    display: flex; align-items: center; justify-content: space-between; padding: 0 28px; flex-shrink: 0;
}
.topbar-title { font-size: 16px; font-weight: 700; }
.topbar-right { display: flex; align-items: center; gap: 14px; }
.topbar-user { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--c-text-secondary); }
.btn-logout {
    background: none; border: 1px solid var(--c-border); border-radius: var(--radius-sm);
    padding: 7px 12px; font-size: 12px; color: var(--c-text-secondary); cursor: pointer;
}
.btn-logout:hover { background: var(--c-red-light); color: var(--c-red); border-color: var(--c-red); }

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

/* ── Cards & stats ── */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
@media (max-width: 900px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

.stat-card {
    background: var(--c-surface); border-radius: var(--radius-lg); padding: 18px 20px;
    box-shadow: var(--shadow-md); border: 1px solid var(--c-border);
}
.stat-label { font-size: 12px; color: var(--c-text-secondary); font-weight: 600; text-transform: uppercase; letter-spacing: .4px; }
.stat-value { font-size: 26px; font-weight: 800; margin-top: 6px; }
.stat-sub   { font-size: 12px; color: var(--c-text-disabled); margin-top: 2px; }

.card {
    background: var(--c-surface); border-radius: var(--radius-lg);
    border: 1px solid var(--c-border); box-shadow: var(--shadow-md); margin-bottom: 20px;
}
.card-header {
    padding: 16px 20px; border-bottom: 1px solid var(--c-border);
    display: flex; align-items: center; justify-content: space-between;
}
.card-title { font-size: 14px; font-weight: 700; }
.card-body { padding: 20px; }

/* ── Tables ── */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; padding: 10px 14px; background: var(--c-bg); color: var(--c-text-secondary); font-weight: 600; font-size: 11px; text-transform: uppercase; }
td { padding: 10px 14px; border-bottom: 1px solid var(--c-border); }
tr:last-child td { border-bottom: none; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 11px; font-weight: 700; }
.badge-sent      { background: var(--c-green-light); color: var(--c-green); }
.badge-simulated { background: var(--c-primary-light); color: var(--c-primary-dark); }
.badge-failed    { background: var(--c-red-light); color: var(--c-red); }
.badge-env-sandbox    { background: var(--c-amber-light); color: var(--c-amber); }
.badge-env-production { background: var(--c-green-light); color: var(--c-green); }

/* ── Forms / buttons ── */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 9px 16px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 600;
    border: 1px solid transparent; cursor: pointer; transition: background var(--transition);
}
.btn-primary   { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-dark); }
.btn-secondary { background: var(--c-bg); color: var(--c-text); border-color: var(--c-border); }
.btn-secondary:hover { background: var(--c-border); }
.btn-danger    { background: var(--c-red-light); color: var(--c-red); }

.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 12px; font-weight: 600; margin-bottom: 6px; color: var(--c-text-secondary); }
.form-input {
    width: 100%; padding: 9px 12px; border: 1px solid var(--c-border); border-radius: var(--radius-sm);
    font-size: 13px; background: var(--c-surface);
}
.form-input:focus { outline: none; border-color: var(--c-primary); }

/* ── Key display ── */
.key-row {
    display: flex; align-items: center; gap: 10px; background: var(--c-bg);
    border: 1px solid var(--c-border); border-radius: var(--radius-sm); padding: 10px 12px; margin-bottom: 8px;
}
.key-value { font-family: 'JetBrains Mono', monospace; font-size: 12px; flex: 1; overflow: hidden; text-overflow: ellipsis; }
.key-actions { display: flex; gap: 6px; }
.btn-icon-sm {
    background: none; border: 1px solid var(--c-border); border-radius: var(--radius-sm);
    width: 30px; height: 30px; cursor: pointer; color: var(--c-text-secondary);
}
.btn-icon-sm:hover { background: var(--c-surface); }

.alert { padding: 10px 14px; border-radius: var(--radius-sm); font-size: 13px; margin-bottom: 16px; }
.alert-error   { background: var(--c-red-light); color: var(--c-red); }
.alert-success { background: var(--c-green-light); color: var(--c-green); }
.alert-warning { background: var(--c-amber-light); color: var(--c-amber); }

.empty-state { text-align: center; padding: 40px 20px; color: var(--c-text-disabled); font-size: 13px; }

/* ── Login page ── */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--c-bg); }
.login-card { width: 380px; background: var(--c-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 36px 32px; }
.login-brand { text-align: center; margin-bottom: 26px; }
.login-brand-icon {
    width: 50px; height: 50px; border-radius: var(--radius-md); background: var(--c-primary);
    color: #fff; display: flex; align-items: center; justify-content: center; margin: 0 auto 12px;
    font-weight: 800; font-size: 18px;
}
.login-brand-name { font-size: 18px; font-weight: 800; }
.login-brand-sub  { font-size: 12px; color: var(--c-text-secondary); margin-top: 2px; }
.btn-block { width: 100%; justify-content: center; }