/* ==========================================================================
   Material Design 3 / CSS Variables & Theme
   ========================================================================== */
:root {
  /* HSL Color Palette */
  --md-sys-color-primary-h: 226;
  --md-sys-color-primary-s: 70%;
  --md-sys-color-primary-l: 50%;
  
  --md-sys-color-secondary-h: 200;
  --md-sys-color-secondary-s: 50%;
  --md-sys-color-secondary-l: 45%;

  /* Light Theme Colors */
  --bg-base: hsl(210, 20%, 98%);
  --bg-surface: #ffffff;
  --bg-surface-variant: hsl(210, 14%, 93%);
  --text-main: hsl(210, 20%, 15%);
  --text-muted: hsl(210, 10%, 40%);
  --border-color: hsl(210, 14%, 89%);
  
  --primary-color: hsl(var(--md-sys-color-primary-h), var(--md-sys-color-primary-s), var(--md-sys-color-primary-l));
  --primary-bg: hsl(var(--md-sys-color-primary-h), var(--md-sys-color-primary-s), 95%);
  
  --success-color: hsl(150, 60%, 40%);
  --success-bg: hsl(150, 60%, 95%);
  
  --warning-color: hsl(40, 90%, 45%);
  --warning-bg: hsl(40, 90%, 95%);
  
  --info-color: hsl(200, 70%, 45%);
  --info-bg: hsl(200, 70%, 95%);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-base: hsl(220, 15%, 10%);
  --bg-surface: hsl(220, 15%, 16%);
  --bg-surface-variant: hsl(220, 15%, 22%);
  --text-main: hsl(210, 20%, 95%);
  --text-muted: hsl(210, 10%, 70%);
  --border-color: hsl(220, 15%, 26%);
  
  --primary-color: hsl(var(--md-sys-color-primary-h), 80%, 70%);
  --primary-bg: hsl(var(--md-sys-color-primary-h), 40%, 20%);
  
  --success-color: hsl(150, 60%, 60%);
  --success-bg: hsl(150, 60%, 20%);
  
  --warning-color: hsl(40, 90%, 60%);
  --warning-bg: hsl(40, 90%, 20%);
  
  --info-color: hsl(200, 70%, 60%);
  --info-bg: hsl(200, 70%, 20%);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-main);
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select {
  font-family: inherit;
}

/* Material Icons */
.material-symbols-rounded {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
}

/* ==========================================================================
   Layout & Components
   ========================================================================== */

/* App Bar */
.app-bar {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.app-bar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-bar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-bar-icon {
  font-size: 32px;
  color: var(--primary-color);
  font-variation-settings: 'FILL' 1;
}

.app-bar-title-group {
  display: flex;
  flex-direction: column;
}

.app-bar-title {
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.app-bar-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.app-bar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.clock-display {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: var(--bg-surface-variant);
  padding: 6px 12px;
  border-radius: var(--radius-full);
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.icon-btn:hover {
  background-color: var(--bg-surface-variant);
  color: var(--text-main);
}

/* Theme Toggle Icons */
[data-theme="light"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: none; }

/* Main Content */
.main-content {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.stat-card {
  background-color: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.stat-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-icon-wrap .material-symbols-rounded {
  font-size: 24px;
  font-variation-settings: 'FILL' 1;
}

.stat-icon-primary { background-color: var(--primary-bg); color: var(--primary-color); }
.stat-icon-green { background-color: var(--success-bg); color: var(--success-color); }
.stat-icon-amber { background-color: var(--warning-bg); color: var(--warning-color); }
.stat-icon-blue { background-color: var(--info-bg); color: var(--info-color); }

.stat-body {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Search Section */
.search-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.search-field-wrap {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 16px 48px 16px 48px;
  font-size: 1rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.search-clear-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.search-clear-btn:hover {
  background-color: var(--bg-surface-variant);
  color: var(--text-main);
}

.search-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 8px;
}

.results-count {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.sort-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sort-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.sort-select {
  padding: 6px 32px 6px 12px;
  font-size: 0.9rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  appearance: none;
  background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23666%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
  background-repeat: no-repeat;
  background-position: right 10px top 50%;
  background-size: 10px auto;
  cursor: pointer;
}

.sort-select:focus {
  outline: none;
  border-color: var(--primary-color);
}

/* Table */
.table-section {
  background-color: var(--bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.table-container {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th {
  background-color: var(--bg-surface-variant);
  padding: 14px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  user-select: none;
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  transition: background-color var(--transition-fast);
}

.data-table th:hover {
  background-color: var(--border-color);
  color: var(--text-main);
}

.data-table th > span:first-child {
  display: inline-block;
  vertical-align: middle;
}

.sort-arrow {
  font-size: 16px;
  opacity: 0.3;
  margin-left: 4px;
  transition: opacity 0.2s, transform 0.2s;
}

.data-table th.sort-asc .sort-arrow { opacity: 1; content: 'arrow_upward'; transform: rotate(180deg); color: var(--primary-color); }
.data-table th.sort-desc .sort-arrow { opacity: 1; content: 'arrow_downward'; color: var(--primary-color); }
.data-table th.sort-asc, .data-table th.sort-desc { color: var(--text-main); }

.data-table td {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.data-table tbody tr {
  transition: background-color var(--transition-fast);
}

.data-table tbody tr:hover {
  background-color: var(--bg-surface-variant);
}

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

.col-no { width: 5%; text-align: center; }
.col-tax { width: 15%; font-family: 'JetBrains Mono', monospace; font-weight: 500; }
.col-name { width: 60%; font-weight: 500; }
.col-date { width: 20%; color: var(--text-muted); }

.data-table td.col-no { text-align: center; color: var(--text-muted); }

/* Skeleton Loading */
.skeleton-row td {
  padding: 16px;
}

.skeleton-wrap {
  display: flex;
  gap: 24px;
}

.skeleton-line {
  height: 20px;
  background: linear-gradient(90deg, var(--bg-surface-variant) 25%, var(--border-color) 50%, var(--bg-surface-variant) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: 4px;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}

.empty-state .material-symbols-rounded {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

/* Pagination */
.pagination-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  gap: 16px;
}

.pag-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.pag-btn:not(:disabled):hover {
  background-color: var(--bg-surface-variant);
  border-color: var(--text-muted);
}

.pag-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pag-pages {
  display: flex;
  gap: 8px;
}

.pag-page-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background-color: transparent;
  color: var(--text-main);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.pag-page-btn:hover:not(.active) {
  background-color: var(--bg-surface-variant);
}

.pag-page-btn.active {
  background-color: var(--primary-bg);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.pag-info {
  font-size: 0.85rem;
  color: var(--text-muted);
  position: absolute;
  right: 24px;
}


/* Footer */
.app-footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  margin-top: auto;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 1000;
  pointer-events: none;
}

.toast {
  background-color: var(--text-main);
  color: var(--bg-base);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateY(100%);
  opacity: 0;
  animation: toast-in 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  pointer-events: auto;
}

.toast.toast-error { background-color: hsl(0, 70%, 45%); color: white; }
.toast.toast-success { background-color: hsl(150, 60%, 30%); color: white; }
.toast.toast-info { background-color: var(--primary-color); color: white; }

.toast.hiding {
  animation: toast-out 0.3s forwards;
}

@keyframes toast-in {
  to { transform: translateY(0); opacity: 1; }
}

@keyframes toast-out {
  to { transform: translateY(20px); opacity: 0; }
}

/* Responsive */
@media (max-width: 768px) {
  .search-meta { flex-direction: column; align-items: flex-start; gap: 12px; }
  .sort-controls { width: 100%; justify-content: space-between; }
  .pag-info { position: static; display: block; text-align: center; width: 100%; margin-top: 12px; }
  .pagination-bar { flex-wrap: wrap; }
  
  .data-table thead { display: none; }
  .data-table tbody tr {
    display: block;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
  }
  .data-table td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    text-align: right;
    padding: 12px 16px;
  }
  .data-table td::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.8rem;
  }
  .data-table td.col-no { text-align: right; }
  .col-no, .col-tax, .col-name, .col-date { width: 100%; }
}