/* ============================================
   Design System — Warm School Admin
   Soft pastels, friendly corners, gentle subject colors.
   ============================================ */

:root {
    /* Surface — warm whites with a hint of cream */
    --bg-canvas:   #fbf9f5;
    --bg-surface:  #ffffff;
    --bg-raised:   #faf7f1;
    --bg-sunken:   #f4f0e8;
    --bg-hover:    #f7f3eb;

    /* Text — softer than near-black */
    --text-primary:   #2b2620;
    --text-secondary: #6b6359;
    --text-tertiary:  #a39a8d;

    /* Borders — warm gray */
    --border-default: #e8e2d4;
    --border-light:   #f0ebde;
    --border-strong:  #d8d1bf;
    --border-focus:   #4a8a7a;

    /* Accent — friendly sage/teal for chrome, borders, active items */
    --accent:        #4a8a7a;
    --accent-hover:  #3a6f62;
    --accent-active: #2d5b4f;
    --accent-soft:   rgba(74, 138, 122, 0.10);
    --accent-muted:  rgba(74, 138, 122, 0.18);
    --accent-text:   #ffffff;

    /* Action — warm amber for primary CTAs, the single saturated colour */
    --accent-action:        #d97706;
    --accent-action-hover:  #b35e05;
    --accent-action-active: #92510a;
    --accent-action-soft:   rgba(217, 119, 6, 0.10);
    --accent-action-text:   #ffffff;

    /* Secondary accent (kept for backwards compatibility) */
    --accent-secondary: #4a8a7a;
    --accent-secondary-soft: rgba(74, 138, 122, 0.10);

    /* Elevated surface (drawers, popovers) */
    --surface-elevated: #ffffff;
    --glass-base: rgba(255, 253, 248, 0.7);

    /* Semantic — softened */
    --success:      #4d8b56;
    --success-soft: rgba(77, 139, 86, 0.10);
    --danger:       #c2554a;
    --danger-soft:  rgba(194, 85, 74, 0.08);
    --warn:         #c97a18;
    --warning:      #c97a18;
    --warning-soft: rgba(201, 122, 24, 0.10);

    /* Subject palette — saturated for borders/dots, soft tint for backgrounds */
    --subj-math: #c2554a;   --subj-math-tint: #fde8e8;
    --subj-sci:  #4a72c2;   --subj-sci-tint:  #e3edfa;
    --subj-thai: #4d8b56;   --subj-thai-tint: #e3f1e8;
    --subj-eng:  #b88718;   --subj-eng-tint:  #fbf2dd;
    --subj-soc:  #7d59a8;   --subj-soc-tint:  #efe7f6;
    --subj-pe:   #cc6e2a;   --subj-pe-tint:   #fbe9da;
    --subj-gen:  #6b6359;   --subj-gen-tint:  #ece9e0;
    --subj-free: #d8d1bf;

    /* Legacy compatibility (mapped to the new tokens) */
    --subj-math-bg:  var(--subj-math-tint); --subj-math-border:  var(--subj-math); --subj-math-text:  var(--text-primary);
    --subj-sci-bg:   var(--subj-sci-tint);  --subj-sci-border:   var(--subj-sci);  --subj-sci-text:   var(--text-primary);
    --subj-thai-bg:  var(--subj-thai-tint); --subj-thai-border:  var(--subj-thai); --subj-thai-text:  var(--text-primary);
    --subj-eng-bg:   var(--subj-eng-tint);  --subj-eng-border:   var(--subj-eng);  --subj-eng-text:   var(--text-primary);
    --subj-soc-bg:   var(--subj-soc-tint);  --subj-soc-border:   var(--subj-soc);  --subj-soc-text:   var(--text-primary);
    --subj-pe-bg:    var(--subj-pe-tint);   --subj-pe-border:    var(--subj-pe);   --subj-pe-text:    var(--text-primary);
    --subj-gen-bg:   var(--subj-gen-tint);  --subj-gen-border:   var(--subj-gen);  --subj-gen-text:   var(--text-primary);
    --subj-free-bg:  var(--bg-surface);     --subj-free-border:  var(--border-light); --subj-free-text: var(--text-tertiary);

    /* Typography */
    --font-heading: 'Kanit', system-ui, -apple-system, sans-serif;
    --font-body:    'Sarabun', system-ui, -apple-system, sans-serif;

    /* Depth — gentle warm shadows */
    --shadow-xs:    0 1px 2px rgba(80, 60, 30, 0.04);
    --shadow-sm:    0 1px 2px rgba(80, 60, 30, 0.05), 0 1px 1px rgba(80, 60, 30, 0.03);
    --shadow-card:  0 1px 2px rgba(80, 60, 30, 0.04), 0 1px 1px rgba(80, 60, 30, 0.03);
    --shadow-md:    0 2px 6px rgba(80, 60, 30, 0.06);
    --shadow-pop:   0 6px 20px rgba(80, 60, 30, 0.08);
    --shadow-modal: 0 24px 48px rgba(80, 60, 30, 0.14);
    --shadow-lg:    var(--shadow-pop);
    --shadow-xl:    var(--shadow-modal);

    /* Shape — rounder, friendlier */
    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Motion */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 140ms var(--ease-out);
    --transition:      200ms var(--ease-out);
    --transition-slow: 260ms var(--ease-out);
}

/* ============================================
   Reset & Base
   ============================================ */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    font-feature-settings: "kern";
    color: var(--text-primary);
    background: var(--bg-canvas);
    min-height: 100vh;
    font-size: 15px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   App Header
   ============================================ */

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.75rem;
    height: 60px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.logo h1 {
    font-family: var(--font-heading);
    font-size: 17px;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.005em;
}

.logo > i {
    font-size: 18px;
    color: var(--accent);
}

/* ============================================
   Buttons
   ============================================ */

button {
    font-family: var(--font-body);
    font-weight: 500;
    cursor: pointer;
    border: none;
    outline: none;
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.btn {
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid transparent;
    white-space: nowrap;
    background: transparent;
    color: var(--text-secondary);
    line-height: 1.3;
}

.btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-primary {
    background: var(--accent-action);
    color: var(--accent-action-text);
    border-color: var(--accent-action);
    font-weight: 600;
    box-shadow: 0 1px 2px rgba(217, 119, 6, 0.20);
}

.btn-primary:hover {
    background: var(--accent-action-hover);
    border-color: var(--accent-action-hover);
    color: var(--accent-action-text);
}

.btn-primary:active {
    background: var(--accent-action-active);
    border-color: var(--accent-action-active);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.btn-secondary:active {
    background: var(--bg-sunken);
}

.btn-sm {
    padding: 5px 11px;
    font-size: 12.5px;
}

.controls {
    display: flex;
    gap: 4px;
    align-items: center;
}

/* ============================================
   Dashboard Layout
   ============================================ */

.dashboard-layout {
    display: grid;
    grid-template-columns: 232px 1fr;
    max-width: 1360px;
    margin: 0 auto;
    padding: 1.5rem 1.75rem 4rem;
    gap: 1.5rem;
    align-items: start;
}

.app-sidebar {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1rem;
    box-shadow: var(--shadow-card);
    position: sticky;
    top: 76px;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
}

.app-sidebar::-webkit-scrollbar { width: 4px; }
.app-sidebar::-webkit-scrollbar-thumb { background: var(--border-default); border-radius: 99px; }

.content-area {
    min-width: 0;
    padding-bottom: 3rem;
}

.header-tools-container {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.header-tools-container > .palette-container,
.header-tools-container > .workload-dashboard {
    flex: 1;
    margin-bottom: 0;
}

.sidebar-header-title {
    font-family: var(--font-heading);
    font-weight: 500;
    color: var(--text-tertiary);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.65rem;
    padding: 0 0.25rem;
}

/* Perspective Toggle — soft pill tabs */
.perspective-toggle {
    display: flex;
    flex-direction: row;
    background: var(--bg-raised);
    padding: 4px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    gap: 2px;
}

.pt-btn {
    background: transparent;
    color: var(--text-secondary);
    padding: 7px 10px;
    flex: 1;
    border-radius: var(--radius-sm);
    font-size: 12.5px;
    font-weight: 500;
    text-align: center;
    transition: color var(--transition-fast), background var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: none;
}

.pt-btn:hover:not(.active) {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.pt-btn.active {
    color: var(--accent);
    background: var(--bg-surface);
    font-weight: 600;
    box-shadow: var(--shadow-card);
}

/* Sidebar Menu */
.sidebar-menu {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.sidebar-menu-item {
    padding: 8px 10px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 13.5px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-menu-item:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.sidebar-menu-item.active {
    color: var(--accent);
    background: var(--accent-soft);
    font-weight: 600;
}

.sidebar-menu-item > i {
    color: var(--text-tertiary);
    font-size: 13px;
    width: 16px;
    text-align: center;
}

.sidebar-menu-item.active > i {
    color: var(--accent);
}

.hidden {
    display: none !important;
}

/* Print Header Hidden */
.print-header {
    display: none;
}

/* Settings Tables */
.table-container {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
}

.table-container::-webkit-scrollbar { width: 5px; }
.table-container::-webkit-scrollbar-thumb { background: var(--border-default); border-radius: 99px; }

.settings-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-body);
}

.settings-table th, .settings-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.settings-table th {
    font-weight: 500;
    font-size: 12px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: var(--bg-raised);
    position: sticky;
    top: 0;
    z-index: 1;
}

.settings-table tr:last-child td { border-bottom: none; }
.settings-table tr:hover td { background: var(--bg-raised); }

/* ============================================
   Notifications
   ============================================ */

.notification-area {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toast {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-pop);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13.5px;
    font-weight: 400;
    animation: toastIn 0.22s var(--ease-out) forwards;
    max-width: 420px;
    border-left-width: 4px;
    border-left-style: solid;
    border-left-color: var(--accent);
}

.toast.error { border-left-color: var(--danger); }
.toast.error i { color: var(--danger); }
.toast.success { border-left-color: var(--success); }
.toast.success i { color: var(--success); }
.toast.info { border-left-color: var(--accent); }
.toast.info i { color: var(--accent); }

@keyframes toastIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to   { opacity: 0; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.mt-4 { margin-top: 1.25rem; }

/* ============================================
   Print Stylesheet — table-based, one timetable per A4 landscape page
   ============================================ */

#print-region {
    display: none;
}

@media print {
    @page {
        size: A4 landscape;
        margin: 1.5cm 1.2cm;
    }

    /* Hide everything except the dedicated print region. */
    body > *:not(#print-region) {
        display: none !important;
    }
    .modal-overlay,
    .conflict-drawer,
    .sidebar-backdrop,
    .notification-area,
    .teacher-preview-panel,
    #print-region ~ * {
        display: none !important;
    }

    body {
        background: #fff !important;
        color: #000 !important;
        margin: 0 !important;
        padding: 0 !important;
        font-family: 'Sarabun', 'TH Sarabun New', sans-serif !important;
        font-size: 10pt !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    #print-region {
        display: block !important;
    }

    .print-page {
        page-break-after: always;
        page-break-inside: avoid;
        break-inside: avoid;
    }

    .print-page:last-child {
        page-break-after: auto;
    }

    /* ---- Header (override the screen `.print-header { display:none }`) ---- */
    .print-header {
        display: block !important;
        text-align: left;
        margin-bottom: 8pt;
    }

    .ph-label {
        font-size: 14pt;
        font-weight: 700;
        color: #000;
        letter-spacing: 0.01em;
    }

    /* ---- Grid ---- */
    .print-grid {
        width: 100%;
        border-collapse: collapse;
        table-layout: fixed;
        font-size: 10pt;
    }

    .print-grid thead {
        display: table-header-group;
    }

    .print-grid th,
    .print-grid td {
        border: 0.75pt solid #000;
        padding: 4pt 5pt;
        vertical-align: top;
        word-break: break-word;
    }

    .print-grid th {
        background: #f4f4f4;
        font-weight: 600;
        text-align: center;
        font-size: 9.5pt;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .print-grid th.pg-day {
        background: #f4f4f4;
        text-align: center;
        font-weight: 600;
    }


    .print-grid .pg-col-day  { width: 2.2cm; }
    .print-grid .pg-col-break { width: 1.0cm; }
    /* slot columns auto-flex with the remaining space */

    .print-grid .pg-break-head,
    .print-grid td.pg-break {
        background-image: repeating-linear-gradient(
            45deg,
            transparent 0 3pt,
            rgba(0,0,0,0.10) 3pt 5pt
        );
        background-color: #fafafa;
    }

    .print-grid .pg-subject {
        font-weight: 600;
        font-size: 10pt;
        line-height: 1.25;
    }

    .print-grid .pg-teacher {
        font-size: 8.5pt;
        color: #333;
        margin-top: 1pt;
        line-height: 1.2;
    }

    .print-grid .pg-exact-time {
        font-size: 7.5pt;
        color: #555;
        font-style: italic;
        margin-top: 1pt;
    }

    /* Fallback shrink for pages that get tight. */
    @media print and (max-height: 18cm) {
        .print-grid { font-size: 9pt; }
        .print-grid .pg-subject { font-size: 9pt; }
    }
}