/**
 * Minimalist Design System for Tele-ICT School Management System
 * Aesthetic: Clean, airy, generous whitespace, subtle 1px borders, calm typography,
 * soft status pills, and dynamic White-Label CSS Custom Properties.
 */

:root {
  --brand-primary: #2E3192;
  --brand-primary-hover: #232675;
  --brand-primary-light: #f0f2ff;

  --surface-bg: #f9fafb;
  --surface-card: #ffffff;
  --surface-subtle: #f3f4f6;
  --border-subtle: #eaecf0;
  --border-strong: #d0d5dd;

  --text-main: #101828;
  --text-secondary: #475467;
  --text-muted: #667085;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-xs: 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-sm: 0 2px 8px rgba(16, 24, 40, 0.05);
  --shadow-md: 0 8px 24px rgba(16, 24, 40, 0.08);
}

/* Base Reset & Typography */
body {
  background-color: var(--surface-bg) !important;
  color: var(--text-main) !important;
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Noto Sans Khmer", sans-serif !important;
  font-size: 0.925rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
  color: var(--text-main);
  letter-spacing: -0.02em;
  font-weight: 600 !important;
}

/* ============================================================================
   1. MINIMALIST APP SHELL LAYOUT (Sidebar + Main Viewport)
   ============================================================================ */
.min-shell {
  display: flex;
  min-height: 100vh;
  background: var(--surface-bg);
}

/* Left Sidebar */
.min-sidebar {
  width: 256px;
  flex-shrink: 0;
  background: var(--surface-card);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 1020;
  transition: transform 0.2s ease;
}

.min-brand {
  padding: 24px 20px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  border-bottom: 1px solid var(--border-subtle);
}

.min-brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

.min-brand-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
}

.min-brand-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.min-nav-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 20px 14px;
}

.min-nav-group {
  margin-bottom: 24px;
}

.min-nav-label {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0 12px;
  margin-bottom: 6px;
}

.min-nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.15s ease;
  margin-bottom: 2px;
}

.min-nav-link i {
  font-size: 1rem;
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.min-nav-link:hover {
  background: var(--surface-subtle);
  color: var(--text-main);
}

.min-nav-link.active {
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  font-weight: 600;
}

.min-nav-link.active i {
  color: var(--brand-primary);
}

/* Sidebar Footer: Subtle White-Label Switcher */
.min-sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-subtle);
  background: #fcfcfd;
}

.min-sidebar-footer label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  display: block;
  margin-bottom: 6px;
}

/* Main Workspace Column */
.min-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* Top Bar */
.min-topbar {
  height: 64px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 1010;
}

.min-search-box {
  position: relative;
  width: 320px;
}

.min-search-box i {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.min-search-box input {
  width: 100%;
  padding: 7px 14px 7px 34px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: var(--surface-bg);
  font-size: 0.85rem;
  color: var(--text-main);
  transition: all 0.15s ease;
}

.min-search-box input:focus {
  outline: none;
  background: #ffffff;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-primary-light);
}

/* Main Content Container with Generous Whitespace */
.min-content {
  max-width: 1320px;
  width: 100%;
  margin: 0 auto;
  padding: 36px 36px 64px;
}

@media (max-width: 991.98px) {
  .min-sidebar {
    position: fixed;
    left: 0;
    transform: translateX(-100%);
  }
  .min-shell.sidebar-open .min-sidebar {
    transform: translateX(0);
    box-shadow: var(--shadow-md);
  }
  .min-topbar {
    padding: 0 20px;
  }
  .min-content {
    padding: 24px 20px 48px;
  }
}

/* ============================================================================
   2. MINIMALIST PAGE HEADERS, PILLS & CARDS
   ============================================================================ */
.min-page-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 28px;
}

.min-page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 0 0 4px 0;
  letter-spacing: -0.025em;
}

.min-page-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0;
}

/* Sub-navigation Pill Bar (Consolidates sub-modules cleanly) */
.min-subnav {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  background: #eef1f5;
  padding: 4px;
  border-radius: 10px;
  margin-bottom: 28px;
}

.min-subnav-link {
  padding: 6px 14px;
  border-radius: 7px;
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.15s ease;
  border: none;
  background: transparent;
  cursor: pointer;
}

.min-subnav-link:hover {
  color: var(--text-main);
}

.min-subnav-link.active {
  background: #ffffff;
  color: var(--text-main);
  font-weight: 600;
  box-shadow: var(--shadow-xs);
}

/* Cards */
.card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-xs) !important;
}

.card-header {
  background: transparent !important;
  border-bottom: 1px solid var(--border-subtle) !important;
  padding: 20px 24px !important;
}

.card-body {
  padding: 24px !important;
}

.card-body.p-0 {
  padding: 0 !important;
}

/* Minimalist Metric Strip Cards */
.min-stat-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  transition: border-color 0.15s ease, transform 0.15s ease;
  height: 100%;
}

.min-stat-card:hover {
  border-color: var(--border-strong);
}

.min-stat-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.min-stat-value {
  font-size: 1.85rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 8px;
}

.min-stat-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ============================================================================
   3. REFINED TABLES (Modern Web Guidance: responsive-table)
   ============================================================================ */
.table-wrapper {
  overflow: auto;
  max-inline-size: 100%;
  max-block-size: min(620px, 78vh);
  container-type: inline-size;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.table-wrapper:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: -2px;
}

.table {
  margin-bottom: 0;
  border-collapse: separate;
  border-spacing: 0;
}

.table thead th {
  position: sticky;
  inset-block-start: 0;
  z-index: 2;
  background-color: #fcfcfd !important;
  color: var(--text-muted) !important;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 13px 20px !important;
  border-bottom: 1px solid var(--border-subtle) !important;
  border-top: none !important;
}

.table tbody td {
  padding: 16px 20px !important;
  vertical-align: middle;
  color: var(--text-secondary);
  border-bottom: 1px solid #f2f4f7 !important;
  font-size: 0.875rem;
}

.table tbody tr:last-child td {
  border-bottom: none !important;
}

.table-hover tbody tr:hover td {
  background-color: #f9fafb !important;
}

/* Minimalist Badges */
.badge {
  font-weight: 500 !important;
  padding: 4px 10px !important;
  border-radius: 999px !important;
  font-size: 0.74rem !important;
  letter-spacing: 0.01em;
}

.bg-primary-soft {
  background-color: var(--brand-primary-light) !important;
  color: var(--brand-primary) !important;
}

.bg-success-soft {
  background-color: #ecfdf3 !important;
  color: #027a48 !important;
}

.bg-warning-soft {
  background-color: #fffaeb !important;
  color: #b54708 !important;
}

.bg-danger-soft {
  background-color: #fef3f2 !important;
  color: #b42318 !important;
}

.bg-info-soft {
  background-color: #f0f9ff !important;
  color: #026aa2 !important;
}

.bg-secondary-soft {
  background-color: #f2f4f7 !important;
  color: #344054 !important;
}

/* ============================================================================
   4. BUTTONS, FORMS & VALIDATION (Modern Web Guidance: validate-input-after-interaction)
   ============================================================================ */
.btn {
  border-radius: var(--radius-sm) !important;
  font-weight: 500 !important;
  font-size: 0.85rem !important;
  padding: 8px 15px !important;
  transition: all 0.15s ease;
}

.btn-sm {
  padding: 5px 11px !important;
  font-size: 0.78rem !important;
}

.btn-primary {
  background-color: var(--brand-primary) !important;
  border-color: var(--brand-primary) !important;
  color: #ffffff !important;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--brand-primary-hover) !important;
  border-color: var(--brand-primary-hover) !important;
}

.btn-outline-primary {
  color: var(--brand-primary) !important;
  border-color: var(--border-strong) !important;
  background: #ffffff;
}

.btn-outline-primary:hover {
  background-color: var(--brand-primary-light) !important;
  border-color: var(--brand-primary) !important;
  color: var(--brand-primary) !important;
}

.form-control,
.form-select {
  border-radius: var(--radius-sm) !important;
  border: 1px solid var(--border-strong) !important;
  padding: 8px 12px !important;
  font-size: 0.875rem !important;
  color: var(--text-main) !important;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--brand-primary) !important;
  box-shadow: 0 0 0 3px var(--brand-primary-light) !important;
}

.field-hint {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

input:user-invalid,
select:user-invalid,
textarea:user-invalid {
  border-color: #d92d20 !important;
  background-color: #fffbfa;
}

input:user-valid,
select:user-valid,
textarea:user-valid {
  border-color: #12b76a;
}

/* ============================================================================
   5. SCHEDULE TABLE, POSITION CARDS & MOBILE SIMULATOR FRAME
   ============================================================================ */
.schedule-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

.schedule-table th,
.schedule-table td {
  border-bottom: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  padding: 14px 12px;
  text-align: center;
  vertical-align: middle;
}

.schedule-table th:first-child,
.schedule-table td:first-child {
  border-left: 1px solid var(--border-subtle);
}

.schedule-table thead th {
  border-top: 1px solid var(--border-subtle);
  background-color: #fcfcfd;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.schedule-table .break-time td {
  background-color: #f9fafb;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.8rem;
  padding: 10px;
}

.position-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color 0.15s ease;
}

.position-card:hover {
  border-color: var(--brand-primary);
}

.type-card {
  cursor: pointer;
  transition: all 0.15s ease;
}

/* Minimalist Mobile Super-App Device Frame */
.mobile-phone-frame {
  width: 340px;
  max-width: 100%;
  margin: 0 auto;
  border: 10px solid #101828;
  border-radius: 40px;
  background: #ffffff;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  position: relative;
}

.mobile-phone-notch {
  width: 100px;
  height: 18px;
  background: #101828;
  border-radius: 0 0 12px 12px;
  margin: 0 auto;
}

/* Nav Tabs override for clean minimalist underline */
.nav-lb-tab {
  border-bottom: 1px solid var(--border-subtle) !important;
  gap: 20px;
}

.nav-lb-tab .nav-link {
  border: none !important;
  border-bottom: 2px solid transparent !important;
  padding: 12px 4px !important;
  color: var(--text-muted) !important;
  font-weight: 500 !important;
  font-size: 0.875rem !important;
  background: transparent !important;
}

.nav-lb-tab .nav-link:hover {
  color: var(--text-main) !important;
}

.nav-lb-tab .nav-link.active {
  color: var(--brand-primary) !important;
  border-bottom-color: var(--brand-primary) !important;
  font-weight: 600 !important;
}

/* Print Styles */
@media print {
  .min-sidebar,
  .min-topbar,
  .min-subnav,
  .no-print {
    display: none !important;
  }
  .min-content {
    padding: 0 !important;
    max-width: 100% !important;
  }
  .card {
    border: none !important;
    box-shadow: none !important;
  }
}