/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #0f1117;
    --bg-raised: #181b22;
    --bg-card: #1e2029;
    --bg-surface: #262933;
    --text: #e8eaed;
    --text-secondary: #b0b3b8;
    --text-muted: #787c84;
    --border: #2e3140;
    --border-light: #3a3f50;
    --primary: #5b9cf6;
    --primary-hover: #4488ee;
    --primary-glow: rgba(91, 156, 246, 0.15);
    --danger: #f06272;
    --danger-glow: rgba(240, 98, 114, 0.12);
    --success: #4ade80;
    --success-glow: rgba(74, 222, 128, 0.12);
    --warning: #fbbf24;
    --accent: #a78bfa;
    --navbar-bg: #151720;
    --navbar-accent: var(--primary);
    --navbar-text: #c8cad0;
    --table-header: #1a1d27;
    --table-header-text: #b0b3b8;
    --table-stripe: rgba(255, 255, 255, 0.02);
    --table-hover: rgba(91, 156, 246, 0.06);
}

html {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
}

body {
    min-height: 100vh;
}

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

h1, h2, h3 { margin-bottom: 0.5rem; color: var(--text); }
h3 { color: var(--text-secondary); }

/* ===== Container ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 15px;
}

/* ===== Alerts ===== */
.alert {
    padding: 10px 15px;
    border-radius: 4px;
    margin-bottom: 15px;
}
.alert-danger {
    background: var(--danger-glow);
    color: var(--danger);
    border: 1px solid rgba(240, 98, 114, 0.25);
}
.alert-success {
    background: var(--success-glow);
    color: var(--success);
    border: 1px solid rgba(74, 222, 128, 0.25);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 9px 18px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    transition: all 0.2s;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}
.btn-primary:hover {
    background: var(--primary-hover);
    text-decoration: none;
    box-shadow: 0 2px 8px var(--primary-glow);
}
.btn-full {
    width: 100%;
}

/* ===== Form ===== */
.form-group {
    margin-bottom: 12px;
}
.form-group label {
    display: block;
    margin-bottom: 4px;
    font-weight: 600;
    color: var(--text);
}
.form-group input,
.form-group select {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    font-size: 14px;
    background: var(--bg-raised);
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
}
.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}
.input-small {
    width: 80px;
    padding: 4px 8px;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    font-size: 14px;
    text-align: center;
    background: var(--bg-raised);
    color: var(--text);
    transition: border-color 0.15s;
}
.input-small:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

/* ===== Tables ===== */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 15px;
    background: var(--bg-card);
    border-radius: 6px;
    overflow: hidden;
}
.admin-table thead th {
    background: var(--bg-surface);
    color: var(--text-secondary);
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
}
.admin-table tbody td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}
.admin-table tbody tr:nth-child(even) {
    background: var(--table-stripe);
}
.admin-table tbody tr:hover {
    background: var(--table-hover);
}
.text-center {
    text-align: center;
}

/* ===== Summary Column ===== */
.col-summary {
    font-weight: 700;
    color: var(--text);
    max-width: 80px;
    white-space: normal;
    word-wrap: break-word;
}

/* ===== Action Buttons ===== */
.action-cell {
    display: flex;
    gap: 6px;
}
.inline-form {
    display: inline;
}
.btn-action {
    width: 30px;
    height: 30px;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    background: var(--bg-raised);
    cursor: pointer;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.btn-approve {
    color: var(--success);
    border-color: rgba(74, 222, 128, 0.3);
}
.btn-approve:hover {
    background: var(--success);
    color: #0f1117;
    border-color: var(--success);
    box-shadow: 0 0 8px var(--success-glow);
}
.btn-deny {
    color: var(--danger);
    border-color: rgba(240, 98, 114, 0.3);
}
.btn-deny:hover {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
    box-shadow: 0 0 8px var(--danger-glow);
}

/* ===== Admin Layout ===== */
.admin-tabs {
    display: flex;
    gap: 2px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border);
}
.tab {
    padding: 10px 18px;
    border-radius: 6px 6px 0 0;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.15s, background 0.15s;
}
.tab:hover {
    text-decoration: none;
    color: var(--text-secondary);
    background: var(--bg-raised);
}
.tab.active {
    background: var(--primary);
    color: #fff;
}

.admin-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
@media (max-width: 768px) {
    .admin-columns {
        grid-template-columns: 1fr;
    }
}
.admin-col h3 {
    margin-bottom: 10px;
}

.assign-form {
    max-width: 500px;
    margin: 0 auto;
}
.assign-form .btn {
    margin-top: 10px;
    float: right;
}

/* ===== Manual User Select ===== */
.manual-user-select {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    padding: 10px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
}
.manual-user-select label {
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}
.manual-user-select select {
    padding: 8px 10px;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    background: var(--bg-raised);
    color: var(--text);
    font-size: 14px;
    min-width: 200px;
    cursor: pointer;
}
.manual-user-select select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

/* ===== Year Selector ===== */
.year-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
    font-size: 18px;
    font-weight: 600;
}

/* ===== Page Header Row ===== */
.page-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    gap: 12px;
}
.page-header-row h2 {
    margin-bottom: 0;
}

/* ===== Filter Bar ===== */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    padding: 10px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
}

/* ===== Checkbox ===== */
.checkbox-label {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}
.checkbox-label span {
    margin-left: 10px;
}
.checkbox-label input[type="checkbox"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    min-width: 18px;
    flex-shrink: 0;
    margin: 0;
    padding: 0;
    vertical-align: middle;
    border: 2px solid var(--border-light);
    border-radius: 4px;
    background: var(--bg-raised);
    cursor: pointer;
    position: relative;
    top: -1px;
    transition: background 0.15s, border-color 0.15s;
}
.checkbox-label input[type="checkbox"]:checked {
    background: var(--primary);
    border-color: var(--primary);
}
.checkbox-label input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 1px;
    width: 6px;
    height: 10px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}
.checkbox-label input[type="checkbox"]:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--primary-glow);
}

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.3px;
}
.badge-primary {
    background: var(--primary-glow);
    color: var(--primary);
}
.badge-success {
    background: var(--success-glow);
    color: var(--success);
}
.badge-danger {
    background: var(--danger-glow);
    color: var(--danger);
}
.badge-muted {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}
.badge-warning {
    background: rgba(251, 191, 36, 0.15);
    color: #fbbf24;
}
.badge-info {
    background: rgba(96, 165, 250, 0.15);
    color: #60a5fa;
}
.badge-used {
    background: rgba(148, 163, 184, 0.15);
    color: #94a3b8;
}

/* ===== Vacation List ===== */
.vacation-list-section {
    margin-top: 20px;
}
.vacation-list-section h3 {
    margin-bottom: 12px;
}
.vacation-year-group {
    margin-bottom: 16px;
}
.vacation-year-heading {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 600;
}
.vacation-list-table {
    max-width: 600px;
}
.text-muted-msg {
    color: var(--text-muted);
    font-style: italic;
}

/* ===== Detail Buttons ===== */
.btn-details {
    color: var(--primary);
    border-color: rgba(91, 156, 246, 0.3);
    font-weight: 700;
    font-size: 18px;
}
.btn-details:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}
.btn-secondary:hover {
    background: var(--border-light);
    color: var(--text);
    text-decoration: none;
}

/* ===== Inactive Row ===== */
.row-inactive {
    opacity: 0.5;
}

/* ===== Detail Form ===== */
.detail-form {
    max-width: 600px;
}
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 20px;
    margin-bottom: 16px;
}
@media (max-width: 600px) {
    .detail-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Error Page ===== */
.error-page {
    text-align: center;
    padding: 60px 20px;
}
.error-page h1 {
    font-size: 72px;
    color: var(--text-muted);
}
.error-page p {
    margin: 10px 0 20px;
    color: var(--text-muted);
}