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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --info: #0891b2;
    --bg: #f1f5f9;
    --card: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --muted: #64748b;
    --sidebar-w: 220px;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 14px;
    color: var(--text);
    background: var(--bg);
}

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

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

.sidebar {
    width: var(--sidebar-w);
    background: #1e293b;
    color: #cbd5e1;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: fixed;
    top: 0; left: 0; bottom: 0;
}

.sidebar-logo {
    padding: 20px 16px;
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid #334155;
}

.sidebar nav { flex: 1; padding: 8px 0; }

.sidebar nav a {
    display: block;
    padding: 10px 16px;
    color: #94a3b8;
    font-size: 13px;
    border-left: 3px solid transparent;
    transition: all .15s;
}

.sidebar nav a:hover,
.sidebar nav a.active {
    color: #fff;
    background: #334155;
    border-left-color: var(--primary);
    text-decoration: none;
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid #334155;
    font-size: 12px;
    color: #64748b;
}

.main {
    margin-left: var(--sidebar-w);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topbar {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar h1 { margin: 0; font-size: 18px; font-weight: 600; }

.content { padding: 24px; flex: 1; }

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.card-title {
    font-size: 14px;
    font-weight: 600;
    margin: 0 0 16px 0;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

/* Stat cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}

.stat-card .stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

.stat-card .stat-label {
    font-size: 12px;
    color: var(--muted);
    margin-top: 4px;
}

/* Table */
.table-wrap { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

th {
    text-align: left;
    padding: 10px 12px;
    background: #f8fafc;
    border-bottom: 2px solid var(--border);
    font-weight: 600;
    color: var(--muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .03em;
}

td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

tr:hover td { background: #f8fafc; }

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    white-space: nowrap;
}

.badge-secondary { background: #e2e8f0; color: #475569; }
.badge-info      { background: #e0f2fe; color: #0369a1; }
.badge-primary   { background: #dbeafe; color: #1d4ed8; }
.badge-warning   { background: #fef3c7; color: #92400e; }
.badge-success   { background: #dcfce7; color: #15803d; }
.badge-danger    { background: #fee2e2; color: #b91c1c; }
.badge-purple    { background: #ede9fe; color: #6d28d9; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all .15s;
    text-decoration: none;
    white-space: nowrap;
}

.btn:hover { text-decoration: none; opacity: .9; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn-primary   { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success   { background: var(--success); color: #fff; }
.btn-warning   { background: var(--warning); color: #fff; }
.btn-danger    { background: var(--danger); color: #fff; }
.btn-secondary { background: #e2e8f0; color: var(--text); }
.btn-info      { background: var(--info); color: #fff; }
.btn-sm        { padding: 4px 10px; font-size: 12px; }

/* Forms */
.form-group { margin-bottom: 16px; }

label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}

input[type=text],
input[type=email],
input[type=password],
input[type=number],
input[type=file],
select,
textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-family: inherit;
    color: var(--text);
    background: #fff;
    transition: border-color .15s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}

textarea { min-height: 120px; resize: vertical; }
textarea.tall { min-height: 320px; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 13px;
}

.alert-success { background: #dcfce7; color: #15803d; border: 1px solid #86efac; }
.alert-danger  { background: #fee2e2; color: #b91c1c; border: 1px solid #fca5a5; }
.alert-info    { background: #e0f2fe; color: #0369a1; border: 1px solid #7dd3fc; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; }

/* Login page */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
}

.login-box {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 36px 32px;
    width: 360px;
}

.login-box h2 {
    margin: 0 0 24px 0;
    font-size: 20px;
    font-weight: 700;
    text-align: center;
}

/* Pagination */
.pagination { display: flex; gap: 4px; margin-top: 16px; }

.pagination a, .pagination span {
    display: inline-block;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 13px;
    color: var(--text);
}

.pagination a:hover { background: #f1f5f9; text-decoration: none; }
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Misc */
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mb-0 { margin-bottom: 0; }
.text-muted { color: var(--muted); }
.text-sm { font-size: 12px; }
.font-mono { font-family: monospace; }


.research-box {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
    font-size: 12px;
    line-height: 1.7;
    max-height: 250px;
    overflow-y: auto;
    white-space: pre-wrap;
    color: var(--muted);
}

.spinner {
    display: inline-block;
    width: 14px; height: 14px;
    border: 2px solid rgba(255,255,255,.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .6s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

@keyframes spin { to { transform: rotate(360deg); } }