/* ===== VARIABLES ===== */
:root {
  --bg-primary: #1c1917;
  --bg-secondary: #292524;
  --bg-tertiary: #44403c;
  --text-primary: #fafaf9;
  --text-secondary: #a8a29e;
  --text-muted: #78716c;
  --amber: #f59e0b;
  --amber-dark: #d97706;
  --amber-light: #fbbf24;
  --green: #22c55e;
  --green-bg: rgba(34, 197, 94, 0.1);
  --red: #ef4444;
  --red-bg: rgba(239, 68, 68, 0.1);
  --border: #44403c;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== HEADER ===== */
.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}
.tagline {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: -2px;
}
.nav-links {
  display: flex;
  gap: 24px;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--amber); }

/* ===== CONTAINER ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ===== CONTROLS BAR ===== */
.controls-bar {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  align-items: flex-end;
  gap: 24px;
  flex-wrap: wrap;
}
.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.control-group label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}
.multi-select {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all 0.2s;
  user-select: none;
}
.chip input { display: none; }
.chip.active {
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber);
  border-color: var(--amber);
}
.chip:hover { border-color: var(--amber-dark); }

select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 0.875rem;
  cursor: pointer;
  outline: none;
}
select:focus { border-color: var(--amber); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}
.btn-primary {
  background: var(--amber);
  color: var(--bg-primary);
}
.btn-primary:hover { background: var(--amber-dark); }
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-small {
  padding: 6px 14px;
  font-size: 0.8125rem;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-small:hover { border-color: var(--amber); color: var(--amber); }
.btn-small:disabled { opacity: 0.4; cursor: not-allowed; }

.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--bg-primary);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== MARKET SUMMARY ===== */
.market-summary {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.market-summary p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== PRICE CARDS ===== */
.price-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.price-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color 0.2s;
}
.price-card:hover { border-color: var(--amber); }
.price-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.price-card-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}
.price-card-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
}
.badge-up {
  background: var(--green-bg);
  color: var(--green);
}
.badge-down {
  background: var(--red-bg);
  color: var(--red);
}
.price-card-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.price-card-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.price-card-change {
  font-size: 0.8125rem;
  margin-top: 8px;
}
.change-up { color: var(--green); }
.change-down { color: var(--red); }

/* ===== CHARTS ===== */
.charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.chart-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}
.chart-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.chart-wrapper {
  position: relative;
  height: 300px;
}

/* ===== TABLES ===== */
.table-section, .history-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}
.table-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.table-header h3 {
  font-size: 0.9375rem;
  font-weight: 600;
}
.table-wrapper {
  overflow-x: auto;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}
th {
  text-align: left;
  padding: 10px 12px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(68, 64, 60, 0.5);
  color: var(--text-primary);
  white-space: nowrap;
}
.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 32px 12px !important;
  font-style: italic;
}

/* ===== CALCULATOR ===== */
.calculator-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.calculator-section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.section-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}
.calc-item label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.calc-item input {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.9375rem;
  outline: none;
}
.calc-item input:focus { border-color: var(--amber); }
.calc-region {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.calc-region label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}
.calc-results {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.calc-results h4 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--amber);
}
.calc-line {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(68, 64, 60, 0.3);
}
.calc-line span:last-child { color: var(--text-primary); font-weight: 500; }
.calc-total {
  display: flex;
  justify-content: space-between;
  padding: 12px 0 0;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--amber);
  border-top: 2px solid var(--amber);
  margin-top: 8px;
}
.calc-disclaimer {
  font-size: 0.6875rem;
  color: var(--text-muted);
  margin-top: 8px;
  font-style: italic;
}

/* ===== HISTORY ===== */
.history-section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.history-controls {
  display: flex;
  gap: 12px;
  margin: 16px 0;
  align-items: center;
}

/* ===== SIGNUP ===== */
.signup-section {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.03));
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
  text-align: center;
}
.signup-inner { max-width: 480px; margin: 0 auto; }
.signup-inner h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.signup-inner p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}
.signup-form {
  display: flex;
  gap: 8px;
  max-width: 400px;
  margin: 0 auto;
}
.signup-form input[type="email"] {
  flex: 1;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
}
.signup-form input[type="email"]:focus { border-color: var(--amber); }
.subscribe-status {
  font-size: 0.8125rem;
  margin-top: 12px;
  min-height: 20px;
}
.status-success { color: var(--green); }
.status-error { color: var(--red); }

/* ===== FOOTER ===== */
.footer {
  text-align: center;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  margin-top: 24px;
}
.footer p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}
.footer-sub {
  font-size: 0.6875rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .nav-links { gap: 16px; }
  .controls-bar { flex-direction: column; align-items: stretch; }
  .charts-row { grid-template-columns: 1fr; }
  .calc-grid { grid-template-columns: 1fr 1fr; }
  .signup-form { flex-direction: column; }
}
@media (max-width: 480px) {
  .container { padding: 16px; }
  .calc-grid { grid-template-columns: 1fr; }
  .price-cards { grid-template-columns: 1fr 1fr; }
}