:root {
    --bg: #f4f6f8;
    --panel: #ffffff;
    --border: #d9e0e6;
    --text: #1f2a37;
    --muted: #667085;
    --primary: #0f4c81;
    --primary-soft: #e8f1f8;
    --danger: #9d1c1c;
    --danger-soft: #fdeaea;
    --success: #135c2e;
    --success-soft: #ebf8ef;
    --shadow: 0 10px 30px rgba(15, 76, 129, 0.08);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.shell { display: grid; grid-template-columns: 300px 1fr; min-height: 100vh; }
.sidebar { background: #0f1720; color: #fff; padding: 24px; display: flex; flex-direction: column; gap: 18px; }
.brand { display: grid; gap: 12px; }
.brand-logo { display: flex; align-items: center; justify-content: flex-start; min-height: 64px; }
.brand-logo.missing { display: none; min-height: 0; }
.brand-logo-image { display: block; max-width: 180px; max-height: 64px; width: auto; height: auto; object-fit: contain; }
.brand h1 { font-size: 22px; margin: 0 0 8px; }
.brand p { margin: 0; color: rgba(255,255,255,0.72); }
.sidebar-card { background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12); border-radius: 12px; padding: 14px; }
.sidebar-card.compact { padding: 12px; }
.sidebar select { width: 100%; margin-top: 8px; }
.label { display: inline-block; margin-bottom: 6px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.sidebar .label { color: rgba(255,255,255,0.7); }
.strong { font-weight: bold; }
.muted { color: var(--muted); }
.sidebar .muted { color: rgba(255,255,255,0.72); }
.nav { display: flex; flex-direction: column; gap: 8px; }
.nav a { display: block; padding: 10px 12px; border-radius: 10px; color: #fff; }
.nav a.active, .nav a:hover { text-decoration: none; background: rgba(255,255,255,0.12); }
.language-switch { margin-top: auto; color: rgba(255,255,255,0.7); }
.language-switch a { color: #fff; }
.main { padding: 32px; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 24px; box-shadow: var(--shadow); margin-bottom: 22px; }
.panel.narrow { max-width: 540px; }
.panel.nested-panel { box-shadow: none; margin-bottom: 0; }
.page-header { display: flex; justify-content: space-between; align-items: start; gap: 16px; margin-bottom: 20px; }
.page-header h2, .page-header h3, .panel h3, .panel h4 { margin: 0 0 8px; }
.stats-grid, .grid-two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.form-grid { display: grid; gap: 16px; }
.form-grid.two-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.form-grid .full-span { grid-column: 1 / -1; }
label span, .checkbox-item span { display: block; margin-bottom: 8px; font-weight: bold; }
input, select, button { font: inherit; }
input, select { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; background: #fff; }
input[readonly] { background: #f8fafc; color: var(--muted); }
button, .btn { display: inline-flex; align-items: center; justify-content: center; padding: 11px 16px; border: 1px solid var(--primary); border-radius: 10px; background: var(--primary); color: #fff; cursor: pointer; font-weight: bold; }
.btn.secondary, button.secondary { background: #fff; color: var(--primary); }
.btn.full-width { width: 100%; }
.danger-button { border-color: var(--danger); background: var(--danger); }
.alert { border-radius: 12px; padding: 12px 14px; margin-bottom: 14px; border: 1px solid transparent; }
.alert.success { background: var(--success-soft); color: var(--success); border-color: #b2dcc0; }
.alert.error { background: var(--danger-soft); color: var(--danger); border-color: #efb5b5; }
.alert.secondary { background: #f5f7fa; color: #4b5563; border-color: #d5dde8; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.table th { color: var(--muted); font-size: 13px; text-transform: uppercase; }
.compact-table th, .compact-table td { padding: 9px 8px; }
.detail-list { display: grid; gap: 10px; }
.detail-list div { display: grid; grid-template-columns: 180px 1fr; gap: 14px; }
.detail-list dt { color: var(--muted); }
.detail-list dd { margin: 0; font-weight: bold; }
.simple-list { margin: 0; padding-left: 18px; }
.simple-list li { margin-bottom: 8px; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; }
.button-row.compact-actions { gap: 10px; align-items: center; }
.empty-state { padding: 18px; border-radius: 12px; background: var(--primary-soft); }
.checkbox-list { display: grid; gap: 8px; margin-top: 8px; }
.checkbox-item { display: flex; align-items: center; gap: 10px; }
.checkbox-item input { width: auto; margin: 0; }
.inline-checkbox span { margin-bottom: 0; }
.badge { border-radius: 999px; padding: 8px 14px; background: var(--primary-soft); color: var(--primary); font-weight: bold; display: inline-flex; align-items: center; }
.status-open { background: #eef6ff; color: #0b4f86; }
.status-locked { background: #fff0f0; color: var(--danger); }
.small-badge { padding: 4px 9px; font-size: 12px; margin-left: 8px; }
.logout-form { margin-top: 4px; }
.link-button { border: 0; background: transparent; padding: 0; margin: 0; color: var(--primary); cursor: pointer; font-weight: bold; }
.danger-link { color: var(--danger); }
.note-box { padding: 12px 14px; border: 1px dashed var(--border); border-radius: 12px; background: #fbfcfe; color: var(--muted); }
.top-gap { margin-top: 20px; }
@media (max-width: 1100px) { .shell { grid-template-columns: 1fr; } .main { padding: 18px; } .brand-logo { justify-content: flex-start; } }
@media (max-width: 960px) { .stats-grid, .grid-two, .form-grid.two-columns { grid-template-columns: 1fr; } }
.inline-form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.attendance-row-form { display: grid; grid-template-columns: 140px 110px 1fr 120px 120px; gap: 8px; }
.attendance-row-form input, .attendance-row-form select { width: 100%; }
.row-weekend { background: #fafcff; }
.row-holiday { background: #fffaf0; }
.compact-grid { gap: 12px; }
@media (max-width: 1200px) { .attendance-row-form { grid-template-columns: 1fr; } }