:root {
  --bg-dark: #0a0e17;
  --bg-card: #111827;
  --bg-card-sub: #172033;
  --border-color: #1f293d;
  --border-focus: #00e5ff;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --accent-cyan: #00e5ff;
  --accent-purple: #a855f7;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --accent-amber: #f59e0b;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Noto Sans TC', sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

input, select, textarea {
  min-width: 0;
  font-family: var(--font-mono);
}

/* Header */
.app-header {
  background: rgba(17, 24, 39, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 12px 20px;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.status-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-indicator.live {
  background: var(--accent-purple);
  box-shadow: 0 0 10px var(--accent-purple);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.9); }
}

.brand-text {
  min-width: 0;
}

.brand-title {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: block;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn-portal {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  background: transparent;
  color: var(--accent-green);
  border: 1px solid var(--accent-green);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-portal:hover {
  background: rgba(16, 185, 129, 0.15);
}

.lang-dropdown {
  background: var(--bg-card-sub);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
}

/* Main Container */
.main-container {
  max-width: 1280px;
  margin: 20px auto;
  padding: 0 16px;
  width: 100%;
  flex: 1;
}

.section-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
}

.section-header {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.badge-purple {
  background: rgba(168, 85, 247, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.badge-blue {
  background: rgba(0, 229, 255, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
}

/* Presets */
.preset-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
}

.preset-btn {
  background: var(--bg-card-sub);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 14px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-btn:hover {
  border-color: var(--accent-purple);
  transform: translateY(-2px);
}

.preset-btn.active {
  border-color: var(--accent-purple);
  background: rgba(168, 85, 247, 0.08);
}

.p-symbol {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  display: block;
  color: var(--text-main);
}

.p-fee {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Layout */
.calculator-layout {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 20px;
}

@media (max-width: 900px) {
  .calculator-layout {
    grid-template-columns: 1fr;
  }
}

.card-title {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
}

.card-subtitle {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

textarea {
  width: 100%;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text-main);
  font-size: 0.85rem;
  line-height: 1.5;
  resize: vertical;
}

textarea:focus {
  outline: none;
  border-color: var(--border-focus);
}

.token-stats-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 6px;
  background: var(--bg-card-sub);
  padding: 6px 12px;
  border-radius: 6px;
}

.token-stats-bar strong {
  color: var(--accent-cyan);
}

.cache-badge {
  font-size: 0.72rem;
  color: var(--accent-amber);
}

.cache-badge.active {
  color: var(--accent-green);
  font-weight: 700;
}

.input-with-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.unit-suffix {
  position: absolute;
  right: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.9rem;
  pointer-events: none;
}

input[type="number"], select {
  width: 100%;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text-main);
  font-size: 0.95rem;
  transition: border-color 0.2s;
}

input[type="number"]:focus, select:focus {
  outline: none;
  border-color: var(--border-focus);
}

/* Status Banner */
.kpi-banner {
  display: flex;
  align-items: center;
  gap: 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 16px;
}

.kpi-icon {
  font-size: 1.5rem;
}

.kpi-text strong {
  display: block;
  font-size: 0.95rem;
  color: var(--accent-green);
}

.kpi-text span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.metric-card {
  background: var(--bg-card-sub);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px;
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
}

.metric-card.highlight-purple::before { background: var(--accent-purple); }
.metric-card.highlight-cyan::before { background: var(--accent-cyan); }
.metric-card.highlight-red::before { background: var(--accent-red); }
.metric-card.highlight-green::before { background: var(--accent-green); }

.m-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.m-value {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 800;
  display: block;
  color: var(--text-main);
}

.m-value.text-red { color: var(--accent-red); }
.m-value.text-green { color: var(--accent-green); }

.m-sub {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Comparison Table */
.comparison-card {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px;
}

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

.comp-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.comp-table th {
  text-align: left;
  padding: 8px 10px;
  background: var(--bg-card-sub);
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

.comp-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

.comp-table tr.active-model {
  background: rgba(168, 85, 247, 0.1);
  font-weight: 700;
}

.text-save {
  color: var(--accent-green);
  font-weight: 700;
}

/* Guide */
.guide-card {
  margin-top: 10px;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.guide-item h4 {
  color: var(--accent-purple);
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.guide-item p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  padding: 16px 20px;
  margin-top: auto;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 8px;
}