:root {
  --font-primary: 'Inter', sans-serif;
  --font-secondary: 'Noto Sans TC', sans-serif;

  /* Swiss Style / Brutalist Palette */
  --color-bg: #FFFFFF;
  --color-text: #000000;
  --color-border: #000000;
  --color-grey-light: #F5F5F5;
  --color-grey-med: #E0E0E0;

  /* Accents */
  --color-accent-blue: #0066FF;
  --color-accent-green: #CCFF00;
  --color-accent-alert: #FF3300;

  --spacing-unit: 8px;
  --border-width: 3px;
  --shadow-offset: 6px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-primary), var(--font-secondary);
  background-color: var(--color-grey-light);
  color: var(--color-text);
  line-height: 1.5;
  padding: calc(var(--spacing-unit) * 2);
}

.grid-container {
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--spacing-unit) * 3);
}

/* Header */
.header {
  border-bottom: var(--border-width) solid var(--color-border);
  padding-bottom: calc(var(--spacing-unit) * 2);
  margin-bottom: calc(var(--spacing-unit) * 1);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.lang-switcher {
  display: flex;
  gap: 8px;
}

.lang-btn {
  background: none;
  border: 2px solid transparent;
  padding: 4px 8px;
  font-family: var(--font-primary);
  font-weight: 700;
  cursor: pointer;
  opacity: 0.5;
  transition: all 0.2s;
}

.lang-btn:hover {
  opacity: 1;
}

.lang-btn.active {
  opacity: 1;
  border: 2px solid var(--color-text);
  background-color: var(--color-text);
  color: var(--color-bg);

}

.header h1 {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.subtitle {
  font-family: 'Courier New', monospace;
  font-weight: 700;
  margin-top: var(--spacing-unit);
  text-transform: uppercase;
}

/* Panels */
.main-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--spacing-unit) * 3);
}

@media (min-width: 992px) {
  .main-content {
    grid-template-columns: 350px 1fr;
  }
}

.panel {
  background: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
  padding: calc(var(--spacing-unit) * 3);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--color-border);
}

.section-title {
  font-size: 1rem;
  font-weight: 700;
  font-family: 'Courier New', monospace;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: var(--spacing-unit);
  margin-bottom: calc(var(--spacing-unit) * 3);
  letter-spacing: 0.1em;
}

/* Controls */
.control-group {
  margin-bottom: calc(var(--spacing-unit) * 2);
}

.control-group label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: calc(var(--spacing-unit) / 2);
  text-transform: uppercase;
}

.slider-group {
  margin-bottom: var(--spacing-unit);
}

.slider-group label {
  font-weight: 400;
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
}

input[type="number"] {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--color-border);
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 1rem;
}

input[type="number"]:focus {
  outline: none;
  background-color: var(--color-accent-green);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--color-text);
  margin-top: 5px;
}

.divider {
  height: 2px;
  background: var(--color-border);
  border: none;
  margin: calc(var(--spacing-unit) * 3) 0;
  border-top: 1px dashed var(--color-border);
  /* Dotted look */
  background: none;
}

/* Manual Payment & Switch */
.highlight-bg {
  background-color: var(--color-grey-light);
  padding: var(--spacing-unit);
  border: 2px solid var(--color-text);
}

.switch {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  width: 100%;
}

.switch input {
  display: none;
}

.track {
  width: 40px;
  height: 20px;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  position: relative;
  margin-right: 12px;
}

.track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  background: var(--color-border);
  transition: transform 0.2s;
}

.switch input:checked+.track {
  background: var(--color-accent-blue);
}

.switch input:checked+.track::after {
  transform: translateX(20px);
  background: white;
}

.tip {
  font-size: 0.75rem;
  margin-top: 5px;
  font-style: italic;
  opacity: 0.7;
}

.hidden {
  display: none;
}

/* Chart */
.chart-wrapper {
  height: 400px;
  width: 100%;
  border: 2px solid var(--color-border);
  padding: var(--spacing-unit);
  margin-bottom: calc(var(--spacing-unit) * 3);
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: calc(var(--spacing-unit) * 2);
}

.card {
  border: 2px solid var(--color-border);
  padding: calc(var(--spacing-unit) * 2);
  background: white;
  position: relative;
}

.card h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  margin-bottom: var(--spacing-unit);
  opacity: 0.6;
}

.card .value {
  font-size: 1.6rem;
  font-weight: 900;
  line-height: 1.1;
  overflow-wrap: break-word;
  /* Ensure long words break */
  word-wrap: break-word;
  hyphens: auto;
}

/* Specific adjustment for Status Card to prevent overflow */
#statusCard .value {
  font-size: 1.4rem;
  /* Slightly smaller for status text */
}

.card .desc {
  font-size: 0.75rem;
  margin-top: var(--spacing-unit);
}

.accent-blue {
  background-color: var(--color-accent-blue);
  color: white;
}

.accent-blue h3,
.accent-blue .desc {
  opacity: 0.9;
}

.accent-green {
  background-color: var(--color-accent-green);
}

/* Data Table */
.data-table-section {
  margin-top: calc(var(--spacing-unit) * 3);
}

.table-container {
  overflow-x: auto;
  border: 2px solid var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  min-width: 800px;
}

th {
  background: var(--color-text);
  color: white;
  padding: 12px;
  text-align: left;
  text-transform: uppercase;
}

td {
  padding: 12px;
  border-bottom: 1px solid var(--color-grey-med);
}

tr:nth-child(even) {
  background-color: var(--color-grey-light);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .header h1 {
    font-size: 2rem;
  }
}