:root {
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --text: #0f172a;
    --text-soft: #334155;
    --muted: #64748b;
    --muted-light: #94a3b8;
    --accent: #0f766e;
    --accent-hover: #115e59;
    --accent-soft: #ccfbf1;
    --accent-text: #134e4a;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --danger-soft: #fee2e2;
    --warn: #d97706;
    --warn-soft: #fef3c7;
    --good: #16a34a;
    --good-soft: #dcfce7;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
    --sidebar-w: 220px;
    --radius: 8px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    font-family: system-ui, 'Segoe UI', 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

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

/* ===== Login ===== */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: var(--bg);
}
.login-card {
    width: 100%;
    max-width: 380px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}
.login-card h1 { margin: 0 0 0.25rem; font-size: 1.4rem; color: var(--accent); }
.login-card p { color: var(--muted); margin: 0 0 1.5rem; font-size: 0.875rem; }
.login-card .error-msg { margin-top: 0.5rem; }

/* ===== Layout ===== */
.app-layout { display: flex; min-height: 100vh; }
.sidebar {
    width: var(--sidebar-w);
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
}
.sidebar-brand {
    padding: 1.25rem 1.25rem 1rem;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--accent);
    border-bottom: 1px solid var(--border);
    letter-spacing: -0.01em;
}
.sidebar-brand small { display: block; font-size: 0.7rem; color: var(--muted); font-weight: 500; margin-top: 0.2rem; letter-spacing: 0; }
.sidebar-nav { flex: 1; padding: 0.5rem 0; overflow-y: auto; }
.nav-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    width: 100%;
    text-align: left;
    padding: 0.6rem 1.25rem;
    border: none;
    border-left: 3px solid transparent;
    background: none;
    color: var(--text-soft);
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.15s, color 0.15s;
}
.nav-item:hover { background: var(--bg-hover); }
.nav-item.active {
    background: var(--accent-soft);
    color: var(--accent-text);
    border-left-color: var(--accent);
    font-weight: 600;
}
.sidebar-footer {
    padding: 0.85rem 1.25rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
    padding: 1rem 1.75rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-card);
    position: sticky;
    top: 0;
    z-index: 10;
}
.topbar h2 { margin: 0; font-size: 1.1rem; font-weight: 600; }
.topbar .topbar-sub { font-size: 0.825rem; color: var(--muted); margin-top: 0.15rem; }
.content { padding: 1.5rem 1.75rem; flex: 1; }

/* ===== Forms ===== */
label { display: block; font-size: 0.8rem; color: var(--text-soft); margin-bottom: 0.3rem; font-weight: 500; }
input, select, textarea {
    width: 100%;
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: var(--bg-card);
    color: var(--text);
    font-size: 0.875rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}
.field { margin-bottom: 0.85rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.help-text { font-size: 0.75rem; color: var(--muted); margin-top: 0.25rem; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.5rem 0.95rem;
    border-radius: var(--radius);
    border: 1px solid transparent;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    background: none;
    font-family: inherit;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-ghost { background: var(--bg-card); color: var(--text-soft); border-color: var(--border-strong); }
.btn-ghost:hover:not(:disabled) { background: var(--bg-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: var(--danger-hover); }
.btn-link { background: none; color: var(--accent); padding: 0.25rem 0.5rem; }
.btn-link:hover { text-decoration: underline; }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.78rem; }
.btn-group { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ===== KPI cards ===== */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem 1.1rem;
    box-shadow: var(--shadow-sm);
    cursor: default;
    transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.kpi-card.clickable { cursor: pointer; }
.kpi-card.clickable:hover { border-color: var(--accent); box-shadow: var(--shadow-md); }
.kpi-card .label { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.kpi-card .value { font-size: 1.85rem; font-weight: 700; margin-top: 0.35rem; color: var(--text); line-height: 1.1; }
.kpi-card .sub { font-size: 0.78rem; color: var(--muted); margin-top: 0.35rem; }
.kpi-card .sub strong { color: var(--accent); font-weight: 600; }

/* ===== Panel ===== */
.panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.1rem 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
}
.panel h3 { margin: 0 0 0.85rem; font-size: 0.95rem; font-weight: 600; }
.panel h4 { margin: 1rem 0 0.5rem; font-size: 0.85rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }

/* ===== Table ===== */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 1rem;
}
.toolbar > * { margin-bottom: 0; }
.toolbar input, .toolbar select {
    width: auto;
    min-width: 160px;
    padding: 0.45rem 0.7rem;
    font-size: 0.85rem;
}
.toolbar .spacer { flex: 1; }

.table-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.data-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.data-table th, .data-table td {
    padding: 0.65rem 0.85rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
.data-table thead th {
    color: var(--muted);
    font-weight: 600;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: #fafbfc;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
.data-table tbody tr { transition: background 0.1s; }
.data-table tbody tr:hover { background: var(--bg-hover); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table td.num { font-variant-numeric: tabular-nums; color: var(--muted); }
.data-table td.actions { text-align: right; white-space: nowrap; }
.data-table td.actions .btn { margin-left: 0.25rem; }
.data-table .empty-row td { text-align: center; padding: 2.5rem 1rem; color: var(--muted); }

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 600;
    line-height: 1.5;
    border: 1px solid transparent;
}
.badge-pro { background: var(--accent-soft); color: var(--accent-text); border-color: rgba(15, 118, 110, 0.2); }
.badge-free { background: var(--bg-hover); color: var(--muted); border-color: var(--border); }
.badge-legacy { background: var(--warn-soft); color: var(--warn); border-color: rgba(217, 119, 6, 0.25); }
.badge-good { background: var(--good-soft); color: var(--good); border-color: rgba(22, 163, 74, 0.25); }
.badge-watch { background: var(--warn-soft); color: var(--warn); border-color: rgba(217, 119, 6, 0.25); }
.badge-alert { background: var(--danger-soft); color: var(--danger); border-color: rgba(220, 38, 38, 0.25); }
.badge-self { background: var(--accent-soft); color: var(--accent-text); border-color: rgba(15, 118, 110, 0.2); }

/* ===== Pagination ===== */
.pagination {
    display: flex;
    gap: 0.35rem;
    align-items: center;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--muted);
    flex-wrap: wrap;
}
.pagination .page-btn {
    min-width: 32px;
    height: 32px;
    padding: 0 0.5rem;
    border: 1px solid var(--border-strong);
    background: var(--bg-card);
    border-radius: 6px;
    color: var(--text-soft);
    cursor: pointer;
    font-size: 0.8rem;
    font-family: inherit;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.pagination .page-btn:hover:not(:disabled) { background: var(--bg-hover); border-color: var(--accent); color: var(--accent); }
.pagination .page-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.pagination .page-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); cursor: default; }
.pagination .total { margin-left: 0.5rem; }

/* ===== Modal ===== */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(15, 23, 42, 0.45);
    display: flex; align-items: center; justify-content: center;
    z-index: 100; padding: 1rem;
    animation: fadeIn 0.12s ease-out;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
    background: var(--bg-card);
    border-radius: 12px;
    max-width: 480px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    padding: 1.5rem;
    box-shadow: 0 20px 50px rgba(15, 23, 42, 0.25);
    animation: slideUp 0.15s ease-out;
}
@keyframes slideUp { from { transform: translateY(8px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.modal.wide { max-width: 720px; }
.modal h3 { margin: 0 0 0.25rem; font-size: 1.1rem; font-weight: 600; }
.modal .modal-sub { margin: 0 0 1.25rem; color: var(--muted); font-size: 0.85rem; }
.modal-actions { display: flex; gap: 0.5rem; justify-content: flex-end; margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--border); }

.detail-grid { display: grid; grid-template-columns: 120px 1fr; gap: 0.5rem 1rem; font-size: 0.875rem; }
.detail-grid dt { color: var(--muted); font-weight: 500; }
.detail-grid dd { margin: 0; word-break: break-word; }

/* ===== Toast ===== */
.toast-stack {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-width: 360px;
}
.toast {
    background: var(--text);
    color: #fff;
    padding: 0.7rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    box-shadow: var(--shadow-md);
    animation: toastIn 0.18s ease-out;
}
.toast.success { background: var(--accent); }
.toast.error { background: var(--danger); }
.toast.warn { background: var(--warn); }
@keyframes toastIn { from { transform: translateY(8px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

/* ===== Misc ===== */
.empty { text-align: center; padding: 2rem; color: var(--muted); }
.error-msg { color: var(--danger); font-size: 0.85rem; margin-top: 0.5rem; }
.loading {
    color: var(--muted);
    padding: 2rem;
    text-align: center;
    font-size: 0.9rem;
}
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.85rem;
}
.section-header h3 { margin: 0; }
.muted { color: var(--muted); }
.tiny { font-size: 0.75rem; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    :root { --sidebar-w: 64px; }
    .sidebar-brand small,
    .nav-item span.nav-label,
    .sidebar-footer .user-name { display: none; }
    .nav-item { justify-content: center; padding: 0.7rem 0; }
    .content { padding: 1rem; }
    .topbar { padding: 0.85rem 1rem; }
}