:root {
    --primary: #2f5fa8;
    --primary-dark: #1f4680;
    --bg: #eef3fb;
    --card-bg: #ffffff;
    --border: #d7e3f2;
    --text: #1b2140;
    --text-muted: #5b6b89;
    --danger: #e5484d;
    --warning: #f5a623;
    --success: #22a06b;
    --toast-bg: #1b2140;
    --radius: 10px;
}

[data-theme="dark"] {
    --primary: #6e93d6;
    --primary-dark: #9dbbef;
    --bg: #10131f;
    --card-bg: #1a2035;
    --border: #2b3358;
    --text: #e8edf7;
    --text-muted: #93a0bd;
    --danger: #f27272;
    --warning: #f6c453;
    --success: #4ade80;
    --toast-bg: #05060a;
}

* { box-sizing: border-box; }

html { color-scheme: light; }
html[data-theme="dark"] { color-scheme: dark; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Sarabun", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.topbar, .card, .modal-box, .login-box,
table.tickets-table th, table.tickets-table td,
.form-group input, .form-group select, .form-group textarea,
.filters select, .filters input, .tab-btn, .row-actions button {
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

a { text-decoration: none; color: inherit; }

.topbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}
.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.brand { font-weight: 700; font-size: 18px; }
.topbar nav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.btn-nav-primary {
    background: var(--primary);
    color: #fff !important;
    padding: 8px 14px;
    border-radius: var(--radius);
    font-weight: 600;
}
.btn-nav-primary:hover { background: var(--primary-dark); }

.page-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px 60px;
}

.footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
    padding: 20px;
}

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

h1 { font-size: 22px; margin: 0 0 16px; }
h2 { font-size: 17px; margin: 0 0 12px; }

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}
.filters select, .filters input {
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 13px;
    background: #fff;
}
.filters input[type="text"] { flex: 1; min-width: 180px; }

table.tickets-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
table.tickets-table th, table.tickets-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
table.tickets-table th {
    background: #f3f7fc;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
}
table.tickets-table tbody tr:hover { background: #f3f7fc; cursor: pointer; }

table.tickets-table th[data-sort] {
    cursor: pointer;
    user-select: none;
    position: relative;
    padding-right: 20px;
}
table.tickets-table th[data-sort]:hover { color: var(--primary); }
table.tickets-table th[data-sort]::after {
    content: '↕';
    position: absolute;
    right: 6px;
    opacity: 0.35;
    font-size: 11px;
}
table.tickets-table th[data-sort].sorted-asc::after { content: '↑'; opacity: 1; color: var(--primary); }
table.tickets-table th[data-sort].sorted-desc::after { content: '↓'; opacity: 1; color: var(--primary); }

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 18px;
    font-size: 13px;
    color: var(--text-muted);
}
.pagination-info { white-space: nowrap; }

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    white-space: nowrap;
}
.badge-priority-low { background: #e3ecfa; color: #2f5fa8; }
.badge-priority-medium { background: #fff7e6; color: #b57a00; }
.badge-priority-high { background: #ffe9e6; color: #d0421b; }
.badge-priority-urgent { background: #fde2e2; color: #c31c1c; }

.badge-status { background: #e9f0fa; color: #444; }
.badge-status.is-closed { background: #e4f7ec; color: var(--success); }

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-grid .full { grid-column: 1 / -1; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--text-muted); }
.form-group input, .form-group select, .form-group textarea {
    padding: 9px 11px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
}
.form-group textarea { resize: vertical; min-height: 90px; }

.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 8px;
    border: none;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #e7edf8; color: var(--text); }
.btn-secondary:hover { background: #d7e3f2; }
.btn-sm { padding: 6px 12px; font-size: 12px; }

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
}
.detail-meta {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-top: 16px;
    font-size: 13px;
}
.detail-meta .item strong { display: block; color: var(--text-muted); font-weight: 600; font-size: 11px; text-transform: uppercase; margin-bottom: 4px; }

.two-col {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    align-items: start;
}

.comment {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 14px;
    margin-bottom: 10px;
    font-size: 13px;
}
.comment.internal { background: #fffbe6; border-color: #f0e2a0; }
.comment-meta { display: flex; justify-content: space-between; color: var(--text-muted); font-size: 11px; margin-bottom: 6px; }

.history-item {
    font-size: 12px;
    color: var(--text-muted);
    padding: 8px 0;
    border-bottom: 1px dashed var(--border);
}

.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--toast-bg);
    color: #fff;
    padding: 12px 18px;
    border-radius: 8px;
    font-size: 13px;
    opacity: 0;
    transform: translateY(10px);
    transition: 0.25s;
    z-index: 999;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.error { background: var(--danger); }

.empty-state { text-align: center; color: var(--text-muted); padding: 40px 0; font-size: 14px; }

/* ===================== Master Data page ===================== */
.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}
.tab-btn {
    padding: 9px 16px;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
}
.tab-btn:hover { background: #eef3fb; }
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.master-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}
.master-toolbar h2 { margin: 0; }

.badge-active { background: #e4f7ec; color: var(--success); }
.badge-inactive { background: #f3e6e6; color: var(--danger); }

.badge-expiry-active { background: #e4f7ec; color: var(--success); }
.badge-expiry-expiring_soon { background: #fff7e6; color: #b57a00; }
.badge-expiry-expired { background: #fde2e2; color: var(--danger); }
.badge-expiry-no_expiry { background: #e9f0fa; color: var(--text-muted); }

.row-actions { display: flex; gap: 6px; }
.row-actions button {
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 6px;
    padding: 5px 10px;
    font-size: 12px;
    cursor: pointer;
}
.row-actions button:hover { background: #eef3fb; }
.row-actions .link-danger { color: var(--danger); border-color: #f3cccc; }
.row-actions .link-success { color: var(--success); border-color: #bfe8d3; }

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 17, 26, 0.45);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal-box {
    background: var(--card-bg);
    border-radius: var(--radius);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 22px;
}
.modal-box-wide { max-width: 760px; }
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
.modal-header h2 { margin: 0; }
.modal-close {
    border: none;
    background: none;
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    color: var(--text-muted);
}
.modal-footer {
    display: flex;
    gap: 10px;
    margin-top: 18px;
}
.form-group.checkbox-row {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}
.form-group.checkbox-row label { font-size: 14px; font-weight: 500; color: var(--text); }

/* ===================== Login page ===================== */
.login-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #eaf1fb 0%, #eef3fb 60%);
}
.login-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 32px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 10px 30px rgba(20, 20, 40, 0.06);
}
.login-brand { font-weight: 700; font-size: 18px; margin-bottom: 18px; }
.login-box h1 { margin: 0 0 4px; font-size: 22px; }
.login-sub { color: var(--text-muted); font-size: 13px; margin: 0 0 20px; }
.login-box .form-group { margin-bottom: 14px; }
.login-error {
    background: #fde2e2;
    color: var(--danger);
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 14px;
}
.login-hint { margin-top: 18px; font-size: 12px; color: var(--text-muted); text-align: center; }
.login-hint code { background: #eef3fb; padding: 2px 6px; border-radius: 4px; }

/* ===================== Navbar user menu ===================== */
.nav-user {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-muted);
    border-left: 1px solid var(--border);
    padding-left: 16px;
    margin-left: 4px;
}
.nav-user .nav-user-name { color: var(--text); font-weight: 600; }
.nav-user .nav-user-role {
    background: #e9f0fa;
    color: var(--text-muted);
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 11px;
    text-transform: capitalize;
}
.nav-user a.logout-link { color: var(--danger); font-weight: 600; }

/* ===================== Theme toggle button ===================== */
.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 15px;
    color: var(--text);
    line-height: 1;
    flex-shrink: 0;
}
.theme-toggle-btn:hover { background: var(--bg); }
.login-theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-bg);
}

/* ===================== Dark theme overrides ===================== */
/* ตัวแปรสีหลักถูกสลับผ่าน CSS variables ด้านบนแล้ว
   ส่วนนี้คือจุดที่โค้ดเดิม hardcode สี hex ตรงๆ จึงต้องกำหนดค่าคู่สำหรับธีมมืดเพิ่มเติม */
[data-theme="dark"] table.tickets-table th { background: #1f2740; color: var(--text-muted); }
[data-theme="dark"] table.tickets-table tbody tr:hover { background: #1f2740; }
[data-theme="dark"] .filters select,
[data-theme="dark"] .filters input,
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select,
[data-theme="dark"] .form-group textarea,
[data-theme="dark"] .row-actions button {
    background: #1f2740;
    color: var(--text);
    border-color: var(--border);
}
[data-theme="dark"] .btn-secondary { background: #242c4a; color: var(--text); }
[data-theme="dark"] .btn-secondary:hover { background: #2b3358; }
[data-theme="dark"] .tab-btn { background: #1a2035; color: var(--text-muted); border-color: var(--border); }
[data-theme="dark"] .tab-btn:hover { background: #1f2740; }
[data-theme="dark"] .tab-btn.active { background: var(--primary); color: #10131f; border-color: var(--primary); }

[data-theme="dark"] .badge-priority-low { background: #26305c; color: #9dbbef; }
[data-theme="dark"] .badge-priority-medium { background: #4a3a12; color: #fbbf24; }
[data-theme="dark"] .badge-priority-high { background: #4a231d; color: #fca5a5; }
[data-theme="dark"] .badge-priority-urgent { background: #4a1616; color: #fca5a5; }
[data-theme="dark"] .badge-status { background: #242c4a; color: #cbd0dc; }
[data-theme="dark"] .badge-status.is-closed { background: #123524; color: #4ade80; }
[data-theme="dark"] .badge-active { background: #123524; color: #4ade80; }
[data-theme="dark"] .badge-inactive { background: #3a1f1f; color: #f27272; }
[data-theme="dark"] .badge-expiry-active { background: #123524; color: #4ade80; }
[data-theme="dark"] .badge-expiry-expiring_soon { background: #4a3a12; color: #fbbf24; }
[data-theme="dark"] .badge-expiry-expired { background: #3a1f1f; color: #f27272; }
[data-theme="dark"] .badge-expiry-no_expiry { background: #242c4a; color: var(--text-muted); }

[data-theme="dark"] .comment.internal { background: #332c14; border-color: #5c4f22; }
[data-theme="dark"] .login-error { background: #3a1f1f; color: #f27272; }
[data-theme="dark"] .login-hint code { background: #1f2740; }
[data-theme="dark"] .login-body { background: linear-gradient(135deg, #10131f 0%, #1a2035 60%); }
[data-theme="dark"] .modal-overlay { background: rgba(0, 0, 0, 0.65); }
[data-theme="dark"] .nav-user .nav-user-role { background: #242c4a; color: var(--text-muted); }

@media (max-width: 800px) {
    .form-grid, .detail-meta { grid-template-columns: 1fr; }
    .two-col { grid-template-columns: 1fr; }
}