:root {
  --bg-main: #f4f7fa;
  --card-bg: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --accent-btc: #f7931a;
  --accent-btc-light: #fff8f0;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --green: #10b981;
  --green-bg: #ecfdf5;
  --red: #ef4444;
  --red-bg: #fef2f2;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --radius: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* Top Navigation Bar */
.top-bar {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 8px 0;
}

.top-bar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--green);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.time-display {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 40px 20px 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-btc-light);
  color: var(--accent-btc);
  font-weight: 600;
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid rgba(247, 147, 26, 0.2);
  margin-bottom: 12px;
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.hero .slogan {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* Price Card */
.price-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.price-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.crypto-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-btc-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.price-info .label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.price-wrapper {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.price-wrapper .value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
}

.change-tag {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
}

.change-tag.up { background: var(--green-bg); color: var(--green); }
.change-tag.down { background: var(--red-bg); color: var(--red); }

.refresh-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.refresh-button:hover {
  background: var(--bg-main);
  color: var(--text-primary);
}

/* Dashboard Layout */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 40px;
}

@media (min-width: 992px) {
  .dashboard-grid {
    grid-template-columns: 380px 1fr;
  }
}

/* Generic Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--primary);
}

.card-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Strategy Selector */
.strategy-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 6px;
}

.radio-label input {
  display: none;
}

.radio-button {
  display: block;
  text-align: center;
  padding: 10px;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.radio-label input:checked + .radio-button {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

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

.form-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.text-link {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
}

.form-group input[type="number"] {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  background: #ffffff;
}

.form-group input[type="number"]:focus {
  outline: none;
  border-color: var(--primary);
}

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

.btn {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: background 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

/* KPI Panel */
.results-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.kpi-card {
  background: var(--bg-main);
  padding: 12px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
}

.kpi-card.highlight {
  background: #fff7ed;
  border: 1px solid #ffedd5;
}

.kpi-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 4px;
}

.kpi-value {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

/* Chart Card */
.chart-card {
  display: flex;
  flex-direction: column;
  min-height: 450px;
}

.chart-wrapper {
  flex-grow: 1;
  width: 100%;
  min-height: 380px;
}

/* Footer, Disclaimer, and Educational Section */
.footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 40px 0 30px;
  margin-top: auto;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.footer-meta {
  text-align: center;
  margin-bottom: 24px;
}

.footer-divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 24px 0;
}

.disclaimer h3, .educational-section h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.disclaimer p {
  margin-bottom: 12px;
  line-height: 1.6;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.educational-section {
  color: var(--text-secondary);
}

.educational-section p {
  margin-bottom: 16px;
  line-height: 1.6;
}

.edu-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 16px;
}

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

.edu-card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
}

.edu-card h4 {
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.edu-card p {
  font-size: 0.82rem;
  margin-bottom: 8px;
}

.edu-card ul {
  padding-left: 20px;
  font-size: 0.8rem;
}

@media (max-width: 600px) {
  .hero h1 { font-size: 1.6rem; }
  .price-card { flex-direction: column; align-items: flex-start; }
  .refresh-button { width: 100%; justify-content: center; }
  .form-row { grid-template-columns: 1fr; }
}