/* ========================================
   CSS Variables
   ======================================== */

:root {
    --clr-primary: #4361ee;
    --clr-primary-hover: #3a56d4;
    --clr-danger: #e74c3c;
    --clr-danger-hover: #c0392b;
    --clr-success: #2ec4b6;
    --clr-success-hover: #26a69a;
    --clr-dark: #16213e;
    --clr-bg: #f0f2f5;
    --clr-card: #ffffff;
    --clr-border: #ddd;
    --clr-border-light: #e8e8e8;
    --clr-border-input: #d0d0d0;
    --clr-text: #333;
    --clr-text-muted: #555;
    --clr-table-stripe: #f8f9fa;
    --clr-modal-overlay: rgba(0, 0, 0, 0.5);
    --clr-error-overlay: rgba(0, 0, 0, 0.55);
    --clr-msg-ok-bg: #d4edda;
    --clr-msg-ok-text: #155724;
    --clr-msg-err-bg: #f8d7da;
    --clr-msg-err-text: #721c24;
    --clr-secondary: #6c757d;
    --clr-secondary-hover: #5a6268;
    --clr-export: #17a2b8;
    --clr-export-hover: #138496;
    --clr-focus-ring: rgba(67, 97, 238, 0.15);
    --clr-white: #fff;
    --clr-heading: #1a1a2e;
    --clr-disabled: #aaa;
    --clr-spinner: #666;
    --clr-border-cell: #eee;
    --clr-cal-hover: #eef2ff;
    --clr-cal-empty: #f5f5f5;
    --clr-unav: #f87171;
    --clr-unav-hover: #ef4444;
    --clr-unav-partial: #fecaca;
    --clr-unav-partial-hover: #fca5a5;
    --clr-sched-entry: #e8f0fe;
    --clr-sched-locked: #fff3cd;
    --clr-warn-bg: #fff3cd;
    --clr-warn-text: #856404;
    --clr-shadow-card: rgba(0, 0, 0, 0.08);
    --clr-shadow-modal: rgba(0, 0, 0, 0.2);
    --clr-shadow-error: rgba(0, 0, 0, 0.25);
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-pill: 12px;
}

/* ========================================
   Base Styles
   ======================================== */

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--clr-bg); color: var(--clr-text); padding: 24px; }
h1 { text-align: center; margin-bottom: 24px; color: var(--clr-heading); }
.hidden { display: none !important; }

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

.container { max-width: 1400px; margin: 0 auto; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 24px; }
.card { background: var(--clr-card); border-radius: var(--radius-lg); padding: 20px; box-shadow: 0 2px 8px var(--clr-shadow-card); }
.card h2,
.schedule-section h2 { font-size: 1.1rem; margin-bottom: 14px; color: var(--clr-dark); border-bottom: 2px solid var(--clr-border-light); padding-bottom: 8px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.topbar-info { font-size: 0.9rem; color: var(--clr-text-muted); display: flex; align-items: center; gap: 12px; }
.login-container { max-width: 400px; margin: 80px auto; }
.schedule-section { margin-top: 8px; }

@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }

/* ========================================
   Forms
   ======================================== */

label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 4px; color: var(--clr-text-muted); }
input, select { width: 100%; padding: 8px 10px; border: 1px solid var(--clr-border-input); border-radius: var(--radius-md); font-size: 0.9rem; margin-bottom: 12px; }
input:focus, select:focus { outline: none; border-color: var(--clr-primary); box-shadow: 0 0 0 2px var(--clr-focus-ring); }
.checkbox-row { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.checkbox-row input { width: auto; margin: 0; }
.checkbox-row label { margin: 0; }
.day-checkboxes { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.day-cb { display: flex; align-items: center; gap: 4px; font-size: 0.85rem; font-weight: 400; cursor: pointer; background: var(--clr-bg); padding: 4px 8px; border-radius: var(--radius-sm); }
.day-cb input { width: auto; margin: 0; }
.checkbox-group { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.cb-option { display: flex; align-items: center; gap: 4px; font-size: 0.85rem; font-weight: 400; cursor: pointer; background: var(--clr-bg); padding: 4px 8px; border-radius: var(--radius-sm); }
.cb-option input { width: auto; margin: 0; }
.cb-option.cb-disabled { opacity: 0.5; cursor: not-allowed; }
.auto-hint { font-size: 0.75rem; color: #888; font-weight: 400; }

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

button {
    border: none;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    width: 100%;
    background: var(--clr-primary);
    color: var(--clr-white);
}
button:hover { background: var(--clr-primary-hover); }
button:disabled { background: var(--clr-disabled); cursor: not-allowed; }

.btn-generate { background: var(--clr-success); font-size: 1rem; padding: 14px; }
.btn-generate:hover:not(:disabled) { background: var(--clr-success-hover); }
.btn-generate:disabled { background: var(--clr-disabled); cursor: not-allowed; opacity: 0.7; }

.btn-danger { background: var(--clr-danger); padding: 4px 10px; width: auto; font-size: 0.8rem; border-radius: var(--radius-sm); }
.btn-danger:hover { background: var(--clr-danger-hover); }

.btn-logout { background: var(--clr-danger); width: auto; padding: 8px 16px; }
.btn-logout:hover { background: var(--clr-danger-hover); }

.btn-cancel { background: var(--clr-secondary); }
.btn-cancel:hover { background: var(--clr-secondary-hover); }

.btn-secondary { background: var(--clr-secondary); width: auto; padding: 8px 16px; }
.btn-secondary:hover { background: var(--clr-secondary-hover); }

.btn-export { background: var(--clr-export); width: auto; padding: 8px 16px; font-size: 0.85rem; }
.btn-export:hover { background: var(--clr-export-hover); }

.btn-dismiss { background: var(--clr-primary); margin-top: 4px; flex-shrink: 0; }

/* ========================================
   Tables
   ======================================== */

table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th { background: var(--clr-dark); color: var(--clr-white); padding: 10px 12px; text-align: left; }
td { padding: 8px 12px; border-bottom: 1px solid var(--clr-border-light); }
tr:nth-child(even) { background: var(--clr-table-stripe); }
.summary { margin-top: 20px; }
.summary h3 { font-size: 1rem; margin-bottom: 8px; color: var(--clr-dark); }
.list { margin-top: 10px; font-size: 0.85rem; }
.list-item { background: var(--clr-table-stripe); padding: 6px 10px; border-radius: var(--radius-sm); margin-bottom: 4px; display: flex; justify-content: space-between; align-items: center; }

.matrix-table { width: 100%; border-collapse: collapse; font-size: 0.8rem; margin-top: 10px; }
.matrix-table th,
.matrix-table td { padding: 6px 8px; border: 1px solid var(--clr-border); text-align: center; white-space: nowrap; }
.matrix-table th { background: var(--clr-dark); color: var(--clr-white); font-size: 0.75rem; }
.matrix-table td:first-child { text-align: left; font-weight: 600; background: var(--clr-table-stripe); }
.matrix-table input[type="checkbox"] { width: auto; margin: 0; cursor: pointer; }
.matrix-wrap { overflow-x: auto; max-height: 500px; overflow-y: auto; }

/* ========================================
   Status & Badges
   ======================================== */

.role-badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; }
.role-admin { background: var(--clr-primary); color: var(--clr-white); }
.role-superadmin { background: var(--clr-dark); color: var(--clr-white); }
.org-info { font-size: 0.85rem; color: var(--clr-text-muted); margin-top: 2px; font-weight: 500; }
.dept-switcher { margin-top: 4px; }
.dept-switcher select { font-size: 0.85rem; padding: 3px 8px; border-radius: 6px; border: 1px solid var(--clr-border); background: var(--clr-white); color: var(--clr-text); cursor: pointer; font-weight: 500; }
.role-employee { background: var(--clr-success); color: var(--clr-white); }
.status-badge { display: inline-block; padding: 4px 10px; border-radius: var(--radius-pill); font-size: 0.8rem; font-weight: 600; margin-bottom: 12px; }
.status-optimal { background: var(--clr-msg-ok-bg); color: var(--clr-msg-ok-text); }
.status-feasible { background: var(--clr-warn-bg); color: var(--clr-warn-text); }
.period-status { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 0.9rem; font-weight: 600; }
.period-open { background: var(--clr-msg-ok-bg); color: var(--clr-msg-ok-text); }
.period-closed { background: var(--clr-msg-err-bg); color: var(--clr-msg-err-text); }
.msg { padding: 10px; border-radius: var(--radius-md); margin-top: 10px; font-size: 0.85rem; }
.msg.ok { background: var(--clr-msg-ok-bg); color: var(--clr-msg-ok-text); }
.msg.err { background: var(--clr-msg-err-bg); color: var(--clr-msg-err-text); }
.day-tags { display: inline; }
.day-tag { display: inline-block; background: var(--clr-border-light); color: var(--clr-text); font-size: 0.7rem; padding: 1px 5px; border-radius: 3px; margin-left: 2px; }
.tab-bar { display: flex; gap: 0; background: var(--clr-bg); border-bottom: 2px solid var(--clr-border); margin-bottom: 20px; position: sticky; top: 0; z-index: 100; padding-top: 4px; }
.tab-btn { flex: 1; padding: 12px 8px; text-align: center; cursor: pointer; background: none; border: none; border-bottom: 3px solid transparent; font-weight: 600; font-size: 0.9rem; color: var(--clr-text-muted); margin-bottom: -2px; transition: color 0.2s, border-color 0.2s; white-space: nowrap; min-width: 0; }
.tab-btn:hover { color: var(--clr-primary); background: none; }
.tab-btn.active { color: var(--clr-primary); border-bottom-color: var(--clr-primary); background: none; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ========================================
   Modals
   ======================================== */

.modal-overlay { display: none; position: fixed; inset: 0; background: var(--clr-modal-overlay); z-index: 1000; justify-content: center; align-items: flex-start; overflow-y: auto; -webkit-overflow-scrolling: touch; padding: 16px 0; }
.modal-overlay.active { display: flex; }
.modal { background: var(--clr-card); border-radius: var(--radius-lg); padding: 24px; width: 90%; max-width: 440px; box-shadow: 0 8px 32px var(--clr-shadow-modal); max-height: 90dvh; max-height: 90vh; overflow-y: auto; -webkit-overflow-scrolling: touch; overscroll-behavior: contain; display: flex; flex-direction: column; margin: auto; }
.modal h3 { margin-bottom: 16px; color: var(--clr-dark); font-size: 1.1rem; border-bottom: 2px solid var(--clr-border-light); padding-bottom: 8px; flex-shrink: 0; }
.modal label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 4px; color: var(--clr-text-muted); }
.modal input, .modal select { width: 100%; padding: 8px 10px; border: 1px solid var(--clr-border-input); border-radius: var(--radius-md); font-size: 0.9rem; margin-bottom: 12px; }
.modal-buttons { display: flex; gap: 10px; margin-top: 8px; flex-shrink: 0; position: sticky; bottom: 0; background: var(--clr-card); padding-top: 8px; z-index: 1; }
.modal-buttons button { flex: 1; }
@media (max-width: 640px) {
  .modal { width: 96%; padding: 16px; max-height: 88dvh; max-height: 88vh; border-radius: var(--radius-md); }
  .modal-overlay { align-items: flex-start; padding: 8px 0; }
}

.error-modal-overlay { display: none; position: fixed; inset: 0; background: var(--clr-error-overlay); z-index: 2000; justify-content: center; align-items: center; }
.error-modal-overlay.active { display: flex; }
.error-modal { background: var(--clr-card); border-radius: 12px; padding: 28px; width: 94%; max-width: 700px; box-shadow: 0 12px 40px var(--clr-shadow-error); max-height: 85vh; display: flex; flex-direction: column; }
.error-modal h3 { margin-bottom: 12px; color: var(--clr-msg-err-text); font-size: 1.1rem; display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.error-modal .error-summary { background: var(--clr-msg-err-bg); color: var(--clr-msg-err-text); padding: 12px 14px; border-radius: 8px; font-size: 0.9rem; margin-bottom: 16px; line-height: 1.5; flex-shrink: 0; }
.error-modal .error-details { overflow-y: auto; flex: 1; min-height: 0; margin-bottom: 16px; }
.error-modal .gap-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.error-modal .gap-table th { background: var(--clr-dark); color: var(--clr-white); padding: 8px 12px; text-align: left; }
.error-modal .gap-table td { padding: 7px 12px; border-bottom: 1px solid var(--clr-border-light); }
.error-modal .gap-table tr:nth-child(even) { background: var(--clr-table-stripe); }
.error-modal .gap-table .missing-count { color: var(--clr-danger); font-weight: 700; }
.error-modal .error-modal-scroll { overflow-y: auto; flex: 1; min-height: 0; margin-bottom: 16px; }
.error-modal .error-section { margin-bottom: 16px; }
.error-modal .error-section h4 { font-size: 0.9rem; margin: 0 0 8px 0; color: var(--clr-text); border-bottom: 1px solid var(--clr-border-light); padding-bottom: 4px; }
.error-modal .overview-stats { display: flex; gap: 12px; flex-wrap: wrap; }
.error-modal .stat-chip { background: var(--clr-table-stripe); padding: 6px 12px; border-radius: 6px; font-size: 0.85rem; }
.error-modal .stat-chip strong { font-size: 1rem; margin-right: 4px; }
.error-modal .gap-table .deficit { color: var(--clr-danger); font-weight: 700; }
.error-modal .gap-table .zero-slots td { color: var(--clr-text-muted); font-style: italic; }
.error-modal .diag-section p { font-size: 0.85rem; margin: 0 0 8px 0; color: var(--clr-text-muted); }
.error-modal .conflict-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.error-modal .conflict-item { background: #fff3cd; color: #856404; padding: 5px 12px; border-radius: 6px; font-size: 0.85rem; font-weight: 600; border: 1px solid #ffc107; }

/* ========================================
   Calendar
   ======================================== */

.cal-month-header { font-size: 1rem; font-weight: 700; color: var(--clr-dark); margin: 16px 0 6px 0; display: flex; align-items: center; gap: 12px; }
.cal-month-header label { font-size: 0.8rem; font-weight: 500; margin: 0; display: flex; align-items: center; gap: 4px; cursor: pointer; }
.cal-month-header input[type="checkbox"] { width: auto; margin: 0; }
.cal-grid { display: grid; grid-template-columns: auto repeat(7, 1fr); gap: 0; border: 1px solid var(--clr-border); border-radius: var(--radius-md); overflow: hidden; margin-bottom: 4px; min-width: 700px; }
.sched-cal-grid { grid-template-columns: repeat(7, 1fr); min-width: 1100px; }
#schedCalendarWrap { overflow-x: auto; }
#unavCalendarWrap  { overflow-x: auto; }
.cal-hdr { background: var(--clr-dark); color: var(--clr-white); font-size: 0.75rem; font-weight: 700; padding: 6px 4px; text-align: center; }
.cal-week-cb { display: flex; align-items: center; justify-content: center; background: var(--clr-table-stripe); border-bottom: 1px solid var(--clr-border); border-right: 1px solid var(--clr-border); padding: 2px; }
.cal-week-cb input[type="checkbox"] { width: auto; margin: 0; cursor: pointer; }
.cal-day { border-bottom: 1px solid var(--clr-border-cell); border-right: 1px solid var(--clr-border-cell); padding: 4px; min-height: 40px; font-size: 0.8rem; cursor: pointer; position: relative; transition: background 0.15s; }
.cal-day:hover { background: var(--clr-cal-hover); }
.cal-day.empty { background: var(--clr-cal-empty); cursor: default; }
.cal-day.empty:hover { background: var(--clr-cal-empty); }
.cal-day .day-num { font-weight: 700; font-size: 0.85rem; color: var(--clr-dark); }
.cal-day.has-unav { background: var(--clr-unav); }
.cal-day.has-unav:hover { background: var(--clr-unav-hover); }
.cal-day.has-unav-partial { background: var(--clr-unav-partial); }
.cal-day.has-unav-partial:hover { background: var(--clr-unav-partial-hover); }
.cal-day.selected { outline: 2px solid var(--clr-primary); z-index: 1; }

.unav-detail { background: var(--clr-table-stripe); border: 1px solid var(--clr-border); border-radius: var(--radius-md); padding: 10px 14px; margin: 4px 0 8px 0; font-size: 0.82rem; }
.unav-detail .shift-cb-row { display: flex; align-items: center; gap: 6px; margin: 4px 0; }
.unav-detail .shift-cb-row input { width: auto; margin: 0; }
.unav-detail .shift-cb-row.greyed { opacity: 0.35; pointer-events: none; }

/* ========================================
   Schedule
   ======================================== */

.sched-cal-day { border-bottom: 1px solid var(--clr-border-cell); border-right: 1px solid var(--clr-border-cell); padding: 4px; min-height: 54px; font-size: 0.75rem; position: relative; }
.sched-cal-day.empty { background: var(--clr-cal-empty); }
.sched-cal-day .day-num { font-weight: 700; font-size: 0.82rem; color: var(--clr-dark); margin-bottom: 2px; }
.sched-entry { padding: 1px 3px; margin: 1px 0; border-radius: 3px; background: var(--clr-sched-entry); font-size: 0.72rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; cursor: default; }
.sched-entry.locked { background: var(--clr-sched-locked); }
.sched-entry.unassigned { background: #f0f0f0; color: #999; border: 1px dashed #ccc; }
.sched-entry.admin-clickable { cursor: pointer; }
.sched-entry.admin-clickable:hover { filter: brightness(0.92); }
.sched-entry.admin-clickable.unassigned:hover { background: #e4e4e4; color: #666; }
.sched-entry.dragging { opacity: 0.4; }
.sched-entry.my-shift { background: #d4edda; border-left: 3px solid #28a745; font-weight: 600; }
.sched-cal-day.drag-over { background: #eef6ff; outline: 2px dashed var(--clr-primary); outline-offset: -2px; }

.my-shifts-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.my-shifts-table th { text-align: left; padding: 8px 12px; background: var(--clr-primary); color: #fff; font-weight: 600; }
.my-shifts-table td { padding: 6px 12px; border-bottom: 1px solid var(--clr-border-light); }
.my-shifts-table tbody tr:nth-child(even) { background: var(--clr-table-stripe); }
.my-shifts-table tbody tr:hover { background: #e8f0fe; }
.my-shifts-table .weekend-row { background: #fff8e1; }
.my-shifts-table .weekend-row:hover { background: #fff3cd; }

/* ========================================
   Utility
   ======================================== */

.spinner { display: none; text-align: center; padding: 20px; font-size: 0.95rem; color: var(--clr-spinner); }
.topbar-center { display: flex; flex-direction: column; align-items: center; }


/* ========================================
   Summary Table
   ======================================== */

.summary-scroll-container {
    overflow: auto;
    max-height: 70vh;
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-md);
}

.summary-table {
    border-collapse: collapse;
    width: max-content;
    min-width: 100%;
}

.summary-table th {
    position: sticky;
    top: 0;
    background: var(--clr-dark);
    color: var(--clr-white);
    z-index: 2;
    white-space: nowrap;
    padding: 10px 12px;
    text-align: left;
}

.summary-table th:first-child {
    position: sticky;
    left: 0;
    top: 0;
    z-index: 3;
    background: var(--clr-dark);
}

.summary-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--clr-border-light);
    white-space: nowrap;
}

.summary-table td:first-child {
    position: sticky;
    left: 0;
    background: var(--clr-card);
    z-index: 1;
    border-right: 1px solid var(--clr-border);
    font-weight: 600;
}

.summary-table tr:nth-child(even) td:first-child {
    background: var(--clr-table-stripe);
}

.summary-table tr:nth-child(even) {
    background: var(--clr-table-stripe);
}