/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Prompt:wght@300;400;500;600;700&display=swap');

/* Color Variables and Theme tokens */
:root {
  --font-sans: 'Inter', 'Prompt', sans-serif;
  
  /* Dark Theme (Default) */
  --bg-app: #0b0f19;
  --bg-gradient: linear-gradient(135deg, #0b0f19 0%, #111827 100%);
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-card: rgba(255, 255, 255, 0.08);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #6366f1; /* Indigo */
  --primary-hover: #4f46e5;
  --secondary: #10b981; /* Emerald */
  --secondary-hover: #059669;
  --accent: #f59e0b; /* Amber */
  --danger: #ef4444;
  --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --backdrop-blur: blur(12px);
  --input-bg: rgba(15, 23, 42, 0.6);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus-border: #6366f1;
}

[data-theme="light"] {
  /* Light Theme */
  --bg-app: #f1f5f9;
  --bg-gradient: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --border-card: rgba(0, 0, 0, 0.06);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary: #4f46e5;
  --primary-hover: #3730a3;
  --secondary: #059669;
  --secondary-hover: #047857;
  --accent: #d97706;
  --danger: #dc2626;
  --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.08);
  --backdrop-blur: blur(12px);
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-border: rgba(0, 0, 0, 0.15);
  --input-focus-border: #4f46e5;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--font-sans);
}

body {
  background: var(--bg-gradient);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  margin-bottom: 2rem;
  box-shadow: var(--card-shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  font-size: 1.75rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

/* Theme Toggle */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-switch {
  display: inline-block;
  height: 26px;
  position: relative;
  width: 50px;
}

.theme-switch input {
  display: none;
}

.slider {
  background-color: #cbd5e1;
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  background-color: white;
  bottom: 3px;
  content: "";
  height: 20px;
  left: 4px;
  position: absolute;
  transition: .4s;
  width: 20px;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(22px);
}

.theme-switch-icon {
  font-size: 1rem;
  color: var(--text-muted);
}

/* Tabs Navigation */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-card);
  padding: 0.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-card);
  margin-bottom: 2rem;
  box-shadow: var(--card-shadow);
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
  color: #ffffff;
  background: var(--primary);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

[data-theme="light"] .tab-btn.active {
  color: #ffffff;
}

/* Tab Panels */
.tab-panel {
  display: none;
  animation: fadeIn 0.4s ease forwards;
}

.tab-panel.active {
  display: block;
}

/* Layout Grid */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (min-width: 1024px) {
  .calculator-grid {
    grid-template-columns: 4fr 5fr;
  }
}

/* Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.25);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-card);
  padding-bottom: 0.75rem;
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
}

.form-label span.badge {
  font-size: 0.8rem;
  background: var(--input-bg);
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  color: var(--primary);
  border: 1px solid var(--border-card);
}

.input-container {
  position: relative;
}

.input-icon-left {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.95rem;
}

.input-unit-right {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.form-control {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 1rem;
  transition: all 0.2s ease;
}

.form-control.has-icon-left {
  padding-left: 2.25rem;
}

.form-control.has-unit-right {
  padding-right: 2.5rem;
}

.form-control:focus {
  outline: none;
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.slider-control {
  width: 100%;
  height: 6px;
  background: var(--input-border);
  border-radius: 3px;
  outline: none;
  margin-top: 0.5rem;
  -webkit-appearance: none;
}

.slider-control::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  transition: transform 0.1s;
}

.slider-control::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

/* Results Display */
.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 640px) {
  .results-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.result-card {
  background: rgba(15, 23, 42, 0.3);
  border: 1px solid var(--border-card);
  padding: 1.25rem;
  border-radius: 12px;
  text-align: center;
}

[data-theme="light"] .result-card {
  background: rgba(255, 255, 255, 0.4);
}

.result-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  font-weight: 500;
}

.result-value {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  word-break: break-all;
}

.result-value.primary {
  color: var(--primary);
}

.result-value.secondary {
  color: var(--secondary);
}

.result-value.accent {
  color: var(--accent);
}

.result-value.danger {
  color: var(--danger);
}

/* Alert Boxes & Advice */
.advice-box {
  background: rgba(99, 102, 241, 0.08);
  border-left: 4px solid var(--primary);
  padding: 1rem;
  border-radius: 0 12px 12px 0;
  margin-bottom: 1.25rem;
}

.advice-box.success {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: var(--secondary);
}

.advice-box.warning {
  background: rgba(245, 158, 11, 0.08);
  border-left-color: var(--accent);
}

.advice-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.advice-text {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Tax Table */
.tax-table-container {
  overflow-x: auto;
  margin-top: 1.5rem;
}

.tax-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.tax-table th, .tax-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-card);
}

.tax-table th {
  color: var(--text-muted);
  font-weight: 600;
}

.tax-table tr.active-bracket {
  background: rgba(99, 102, 241, 0.08);
  font-weight: 600;
}

.tax-table tr.active-bracket td {
  color: var(--primary);
}

/* Chart Container */
.chart-container {
  position: relative;
  width: 100%;
  height: 320px;
  margin-top: 1rem;
}

/* List Items style */
.quota-list {
  list-style: none;
  margin-top: 0.5rem;
}

.quota-item {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--border-card);
  font-size: 0.9rem;
}

.quota-item:last-child {
  border-bottom: none;
}

.quota-name {
  color: var(--text-muted);
}

.quota-value {
  font-weight: 600;
}

/* Keyframes */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Tooltip and badges */
.badge-bracket {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--primary);
  color: #ffffff;
  display: inline-block;
}

.badge-bracket.exempt {
  background: var(--text-muted);
}

.badge-bracket.low {
  background: var(--secondary);
}

.badge-bracket.high {
  background: var(--danger);
}

/* Integration Grid */
.integration-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .integration-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.highlight-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(16, 185, 129, 0.15) 100%);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

/* Button style */
.btn {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.btn:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

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

.btn-secondary:hover {
  background: var(--secondary-hover);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

/* Footer */
footer {
  margin-top: 3rem;
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-card);
}

/* User Selector and Modal Styles */
.user-control-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-right: 1rem;
}

.user-select-dropdown {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-main);
  padding: 0.4rem 2rem 0.4rem 0.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' 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 0.5rem center;
  background-size: 1rem;
}

[data-theme="light"] .user-select-dropdown {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23475569' 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");
}

.btn-icon-only {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-icon-only:hover {
  color: var(--text-main);
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

/* Modal overlay styling */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  box-shadow: var(--card-shadow);
  border-radius: 16px;
  width: 90%;
  max-width: 450px;
  padding: 1.5rem;
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal-card {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-card);
  padding-bottom: 0.75rem;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color 0.2s;
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.user-item-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-card);
}

[data-theme="light"] .user-item-row {
  background: rgba(0, 0, 0, 0.02);
}

.user-item-name {
  font-weight: 500;
  font-size: 0.95rem;
}

.btn-delete-user {
  background: transparent;
  border: none;
  color: var(--danger);
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s;
  padding: 0.25rem;
}

.btn-delete-user:hover {
  opacity: 1;
}

/* Spinner and Loaders */
.sync-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: 1rem;
}

.spinner {
  animation: rotate 1s linear infinite;
  width: 14px;
  height: 14px;
}

.spinner circle {
  stroke: var(--primary);
  stroke-dasharray: 42;
  stroke-dashoffset: 14;
}

@keyframes rotate {
  100% {
    transform: rotate(360deg);
  }
}