/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  /* Brand */
  --color-primary: #1f3864;
  --color-primary-dark: #142544;
  --color-primary-light: #2f4d7a;
  --color-primary-tint: #eaf0fb;

  /* Semantic status */
  --color-danger: #dc2626;
  --color-danger-tint: #fdecec;
  --color-danger-border: #f6c6c6;
  --color-warning: #b45309;
  --color-warning-tint: #fef3e0;
  --color-warning-border: #f5d99a;
  --color-success: #15803d;
  --color-success-tint: #e8f7ee;
  --color-success-border: #b8e6c8;
  --color-info: #0369a1;
  --color-info-tint: #e6f4fb;

  /* Neutral surface */
  --color-bg: #f4f6fa;
  --color-surface: #ffffff;
  --color-surface-alt: #f8f9fc;
  --color-border: #e1e5ee;
  --color-border-strong: #c9d0de;

  /* Text */
  --color-text: #1c2434;
  --color-text-secondary: #5c6579;
  --color-text-muted: #8892a3;
  --color-text-on-primary: #ffffff;

  /* Spacing scale (4px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-pill: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(20, 30, 60, 0.06);
  --shadow-md: 0 4px 12px rgba(20, 30, 60, 0.08);
  --shadow-lg: 0 12px 32px rgba(20, 30, 60, 0.14);

  /* Typography */
  --font-sans: 'Be Vietnam Pro', 'Inter', -apple-system, BlinkMacSystemFont,
    'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --text-xs: 12px;
  --text-sm: 13.5px;
  --text-base: 15px;
  --text-md: 16px;
  --text-lg: 18px;
  --text-xl: 22px;
  --text-2xl: 28px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 220ms;

  /* Layout */
  --sidebar-width: 248px;
  --topbar-height: 60px;
  --z-sidebar: 100;
  --z-topbar: 90;
  --z-overlay: 200;
  --z-modal: 300;
  --z-toast: 400;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.55;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100dvh;
}
h1, h2, h3, h4, p, figure { margin: 0; }
h1, h2, h3, h4 { font-weight: 700; color: var(--color-text); letter-spacing: -0.01em; }
h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
button { font-family: inherit; }
input, select, textarea { font-family: inherit; font-size: var(--text-base); }
a { color: var(--color-primary); }
ul { margin: 0; padding: 0; list-style: none; }
table { border-collapse: collapse; width: 100%; }
::selection { background: var(--color-primary-tint); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0; padding: 0; margin: -1px;
}

/* Focus ring — never remove, only restyle */
:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================================
   APP SHELL
   ============================================================ */
#app { min-height: 100dvh; }

.app-shell {
  display: flex;
  min-height: 100dvh;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  display: flex;
  flex-direction: column;
  position: fixed;
  inset: 0 auto 0 0;
  z-index: var(--z-sidebar);
  transition: transform var(--duration-base) var(--ease-out);
}

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5) var(--space-4);
  color: #fff;
}
.sidebar__brand-mark {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.14);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.sidebar__brand-text { line-height: 1.25; }
.sidebar__brand-title { font-weight: 700; font-size: var(--text-md); }
.sidebar__brand-sub { font-size: var(--text-xs); color: rgba(255,255,255,0.6); }

.sidebar__nav { flex: 1; overflow-y: auto; padding: var(--space-2) var(--space-3); }
.sidebar__nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 11px var(--space-3);
  border-radius: var(--radius-md);
  color: rgba(255,255,255,0.78);
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  margin-bottom: 2px;
  min-height: 44px;
  transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
}
.sidebar__nav-link svg { flex-shrink: 0; width: 20px; height: 20px; }
.sidebar__nav-link:hover { background: rgba(255,255,255,0.08); color: #fff; }
.sidebar__nav-link.is-active {
  background: rgba(255,255,255,0.16);
  color: #fff;
}
.sidebar__nav-link.is-active::before { content: ''; }

.sidebar__footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid rgba(255,255,255,0.12);
}
.sidebar__user { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-3); }
.sidebar__user-avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: rgba(255,255,255,0.16);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: var(--text-sm); color: #fff; flex-shrink: 0;
}
.sidebar__user-name { font-size: var(--text-sm); font-weight: 600; color: #fff; }
.sidebar__logout-btn {
  width: 100%;
  display: flex; align-items: center; justify-content: center; gap: var(--space-2);
  background: rgba(255,255,255,0.1);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  min-height: 44px;
  font-size: var(--text-sm); font-weight: 600;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out);
}
.sidebar__logout-btn:hover { background: rgba(255,255,255,0.2); }

.sidebar-backdrop {
  display: none;
  position: fixed; inset: 0;
  background: rgba(15, 20, 35, 0.5);
  z-index: calc(var(--z-sidebar) - 1);
}

/* --- Main column --- */
.main-col {
  flex: 1;
  min-width: 0;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
}

.topbar {
  height: var(--topbar-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: var(--z-topbar);
}
.topbar__menu-btn {
  display: none;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  border: none; background: transparent; border-radius: var(--radius-md);
  cursor: pointer; color: var(--color-text);
}
.topbar__menu-btn:hover { background: var(--color-surface-alt); }
.topbar__title { font-size: var(--text-lg); font-weight: 700; }
.topbar__spacer { flex: 1; }

.btn-refresh {
  display: inline-flex; align-items: center; gap: var(--space-2);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 9px var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: 600;
  cursor: pointer;
  min-height: 40px;
  transition: background var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}
.btn-refresh:hover { background: var(--color-surface-alt); }
.btn-refresh:active { transform: scale(0.97); }
.btn-refresh svg { transition: transform var(--duration-base) var(--ease-out); }
.btn-refresh.is-loading svg { animation: spin 0.8s linear infinite; }

.page {
  flex: 1;
  padding: var(--space-6);
  max-width: 1280px;
  width: 100%;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   LOGIN PAGE
   ============================================================ */
.login-screen {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: var(--space-5);
}
.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-8) var(--space-6);
}
.login-card__brand {
  display: flex; flex-direction: column; align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  text-align: center;
}
.login-card__brand-mark {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-primary-tint);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
}
.login-card__title { font-size: var(--text-xl); }
.login-card__subtitle { color: var(--color-text-secondary); font-size: var(--text-sm); }

/* ============================================================
   FORM ELEMENTS
   ============================================================ */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: var(--space-4); }
.field__label { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.field__label .required { color: var(--color-danger); margin-left: 2px; }
.field__hint { font-size: var(--text-xs); color: var(--color-text-muted); }
.field__error { font-size: var(--text-xs); color: var(--color-danger); font-weight: 500; }

.input, .select, textarea.input {
  width: 100%;
  min-height: 44px;
  padding: 10px var(--space-3);
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}
.input:hover, .select:hover { border-color: var(--color-text-muted); }
.input:focus, .select:focus, textarea.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-tint);
}
.input.has-error, .select.has-error { border-color: var(--color-danger); }
.input.has-error:focus { box-shadow: 0 0 0 3px var(--color-danger-tint); }
.input:disabled, .select:disabled { background: var(--color-surface-alt); color: var(--color-text-muted); cursor: not-allowed; }

.select { appearance: none; padding-right: 36px; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%235c6579' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
}

.form-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 var(--space-4); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: 44px;
  padding: 10px var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 600;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
  touch-action: manipulation;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover:not(:disabled) { background: var(--color-primary-light); }

.btn--secondary { background: var(--color-surface); color: var(--color-text); border-color: var(--color-border-strong); }
.btn--secondary:hover:not(:disabled) { background: var(--color-surface-alt); }

.btn--danger { background: var(--color-danger); color: #fff; }
.btn--danger:hover:not(:disabled) { background: #b91c1c; }

.btn--ghost { background: transparent; color: var(--color-primary); }
.btn--ghost:hover:not(:disabled) { background: var(--color-primary-tint); }

.btn--block { width: 100%; }
.btn--sm { min-height: 36px; padding: 6px var(--space-3); font-size: var(--text-sm); }

.btn .spinner { display: none; }
.btn.is-loading .spinner { display: inline-flex; }
.btn.is-loading .btn__label { opacity: 0.7; }

.spinner {
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.btn--secondary .spinner, .btn--ghost .spinner {
  border-color: var(--color-border-strong); border-top-color: var(--color-primary);
}

/* ============================================================
   CARDS / STAT TILES
   ============================================================ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.card__header {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.card__body { padding: var(--space-5); }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.stat-tile {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; gap: var(--space-2);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out);
}
.stat-tile:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.stat-tile::before {
  content: '';
  position: absolute; inset: 0 auto 0 0;
  width: 4px;
  background: var(--tile-accent, var(--color-primary));
}
.stat-tile__top { display: flex; align-items: center; justify-content: space-between; }
.stat-tile__icon {
  width: 38px; height: 38px;
  border-radius: var(--radius-md);
  background: var(--tile-tint, var(--color-primary-tint));
  color: var(--tile-accent, var(--color-primary));
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.stat-tile__label { font-size: var(--text-sm); color: var(--color-text-secondary); font-weight: 600; }
.stat-tile__value { font-size: var(--text-2xl); font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.stat-tile__value.is-money { font-size: var(--text-xl); }

.stat-tile--danger { --tile-accent: var(--color-danger); --tile-tint: var(--color-danger-tint); }
.stat-tile--warning { --tile-accent: var(--color-warning); --tile-tint: var(--color-warning-tint); }
.stat-tile--info { --tile-accent: var(--color-info); --tile-tint: var(--color-info-tint); }
.stat-tile--success { --tile-accent: var(--color-success); --tile-tint: var(--color-success-tint); }

/* ============================================================
   TOOLBAR / FILTERS
   ============================================================ */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.toolbar__spacer { flex: 1; }
.search-box {
  position: relative;
  min-width: 220px;
  flex: 1;
  max-width: 320px;
}
.search-box svg {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  color: var(--color-text-muted); pointer-events: none;
}
.search-box .input { padding-left: 38px; }

/* ============================================================
   TABLE
   ============================================================ */
.table-wrap {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: auto;
  box-shadow: var(--shadow-sm);
}
.data-table { min-width: 640px; }
.data-table thead th {
  position: sticky; top: 0;
  background: var(--color-surface-alt);
  text-align: left;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  font-weight: 700;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
  vertical-align: middle;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr { transition: background var(--duration-fast) var(--ease-out); }
.data-table tbody tr:hover { background: var(--color-surface-alt); }
.data-table td.num, .data-table th.num { text-align: right; font-variant-numeric: tabular-nums; }

.data-table tr.row-danger { background: var(--color-danger-tint); }
.data-table tr.row-danger:hover { background: #fbdcdc; }
.data-table tr.row-warning { background: var(--color-warning-tint); }
.data-table tr.row-warning:hover { background: #fbe8c4; }
.data-table tr.row-success { background: var(--color-success-tint); }
.data-table tr.row-success:hover { background: #d9f2e2; }

/* ============================================================
   BADGE / STATUS PILL
   ============================================================ */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 700;
  white-space: nowrap;
}
.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex-shrink: 0; }
.badge--danger { background: var(--color-danger-tint); color: var(--color-danger); }
.badge--warning { background: var(--color-warning-tint); color: var(--color-warning); }
.badge--success { background: var(--color-success-tint); color: var(--color-success); }
.badge--neutral { background: var(--color-surface-alt); color: var(--color-text-secondary); }
.badge--info { background: var(--color-info-tint); color: var(--color-info); }

/* ============================================================
   EMPTY / LOADING / ERROR STATES
   ============================================================ */
.state-block {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  padding: var(--space-10) var(--space-5);
  color: var(--color-text-secondary);
  gap: var(--space-3);
}
.state-block__icon { color: var(--color-text-muted); }
.state-block__title { font-weight: 700; color: var(--color-text); font-size: var(--text-md); }
.state-block--error .state-block__icon { color: var(--color-danger); }

.skeleton {
  background: linear-gradient(90deg, var(--color-surface-alt) 25%, #eef1f6 37%, var(--color-surface-alt) 63%);
  background-size: 400% 100%;
  animation: skeleton-wave 1.4s ease infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-wave { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
@media (prefers-reduced-motion: reduce) { .skeleton { animation: none; } }

/* ============================================================
   MODAL
   ============================================================ */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(15, 20, 35, 0.5);
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-4);
  z-index: var(--z-modal);
  animation: fade-in var(--duration-base) var(--ease-out);
}
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: modal-in var(--duration-base) var(--ease-out);
}
@keyframes modal-in { from { opacity: 0; transform: translateY(12px) scale(0.98); } to { opacity: 1; transform: none; } }
.modal__header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.modal__close {
  width: 36px; height: 36px; border: none; background: transparent; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--color-text-secondary);
}
.modal__close:hover { background: var(--color-surface-alt); }
.modal__body { padding: var(--space-5); overflow-y: auto; }
.modal__footer {
  display: flex; justify-content: flex-end; gap: var(--space-3);
  padding: var(--space-4) var(--space-5); border-top: 1px solid var(--color-border);
}

/* ============================================================
   TOAST
   ============================================================ */
.toast-region {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: min(360px, calc(100vw - 32px));
}
.toast {
  background: var(--color-text);
  color: #fff;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--text-sm);
  display: flex; align-items: flex-start; gap: var(--space-2);
  animation: toast-in var(--duration-base) var(--ease-out);
}
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.toast--success { background: var(--color-success); }
.toast--error { background: var(--color-danger); }
.toast--info { background: var(--color-primary); }

/* ============================================================
   TABS (Cong no page)
   ============================================================ */
.tabs { display: flex; gap: var(--space-2); border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-5); }
.tab-btn {
  padding: var(--space-3) var(--space-4);
  border: none; background: transparent;
  font-size: var(--text-base); font-weight: 600; color: var(--color-text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  min-height: 44px;
  transition: color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
}
.tab-btn:hover { color: var(--color-text); }
.tab-btn.is-active { color: var(--color-primary); border-color: var(--color-primary); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .sidebar { transform: translateX(-100%); box-shadow: var(--shadow-lg); }
  .sidebar.is-open { transform: translateX(0); }
  .sidebar-backdrop.is-visible { display: block; }
  .main-col { margin-left: 0; }
  .topbar__menu-btn { display: flex; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .page { padding: var(--space-4); }
  .topbar { padding: 0 var(--space-4); }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .login-card { padding: var(--space-6) var(--space-4); }
  .toast-region { left: var(--space-4); right: var(--space-4); max-width: none; }
}

@media (max-width: 420px) {
  .stat-grid { grid-template-columns: 1fr; }
}