:root {
  --bg: #0f1115;
  --panel: #1c2129;
  --panel-alt: #272e38;
  --accent: #3d82f6;
  --accent-hover: #2563eb;
  --accent-grad: linear-gradient(135deg, #3d82f6, #6a5af9 60%, #b14bf4);
  --text: #e9eef5;
  --muted: #9aa4b1;
  --danger: #ef4444;
  --success: #16a34a;
  --border: #2c3642;
  --shadow: 0 4px 18px -6px rgba(0, 0, 0, 0.66);
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-main);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Typography */
h1 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 0 0 1rem;
  line-height: 1.1;
  font-weight: 800;
  background: var(--accent-grad);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}

h2 {
  margin: 2.5rem 0 1.5rem;
  font-size: 1.2rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

p {
  line-height: 1.6;
  color: var(--muted);
  max-width: 65ch;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-hover);
}

/* Layout */
.main-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 1400px;
  margin: 0 auto;
}

header {
  padding: clamp(2rem, 4vw, 4rem) clamp(1rem, 5vw, 2rem) 1rem;
  width: 100%;
}

main {
  padding: 0 clamp(1rem, 5vw, 2rem) 4rem;
  width: 100%;
  flex: 1;
}

.layout {
  display: grid;
  grid-template-columns: minmax(350px, 400px) 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Forms */
form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: var(--panel);
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.row {
  display: grid;
  gap: 0.75rem;
}

.row.inline {
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

input[type=number], select, input[type=text] {
  width: 100%;
  background: var(--panel-alt);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 500;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type=number]:focus, select:focus, input[type=text]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 130, 246, 0.15);
}

input[type=range] {
  width: 100%;
  cursor: pointer;
  accent-color: var(--accent);
}

.pair {
  display: grid;
  grid-template-columns: 1fr 120px;
  gap: 1rem;
  align-items: center;
}

.help {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.4;
}

.help.danger {
  color: var(--danger);
}

/* Cards */
.cards {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  width: 100%;
  margin-bottom: 2rem;
}

.card {
  background: var(--panel);
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  border-color: #3d4b5c;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, rgba(61, 130, 246, 0.08), transparent 60%);
  pointer-events: none;
}

.card h3 {
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--muted);
}

.card .value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

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

/* Charts */
.chart-container {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 1.5rem;
  position: relative;
  height: 400px;
  width: 100%;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  padding: 0 clamp(1rem, 5vw, 2rem);
  overflow-x: auto;
  padding-bottom: 0.5rem; /* For scrollbar */
}

.tabs button {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  white-space: nowrap;
}

.tabs button:hover {
  background: var(--panel-alt);
  color: var(--text);
}

.tabs button.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(61, 130, 246, 0.3);
}

.tab-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Advanced Options */
.toggle-advanced {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toggle-advanced:hover {
  text-decoration: underline;
}

.advanced {
  display: none;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}

.advanced.show {
  display: grid;
  gap: 1.25rem;
}

/* Tables */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--panel);
  margin: 1.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 800px;
}

th, td {
  padding: 1rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
}

th {
  text-align: right;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  background: rgba(28, 33, 41, 0.95);
  position: sticky;
  top: 0;
}

th:first-child, td:first-child {
  text-align: left;
  padding-left: 1.5rem;
}

th:last-child, td:last-child {
  padding-right: 1.5rem;
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: var(--panel-alt);
}

/* Mobile Cards for Table */
.platform-cards {
  display: none;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.platform-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem;
}

.platform-card.best {
  border-color: var(--success);
  box-shadow: 0 0 0 1px var(--success);
}

.platform-card h4 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  color: var(--text);
}

.metric {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.metric-label {
  color: var(--muted);
}

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

/* Info Box */
.info-box {
  background: rgba(61, 130, 246, 0.1);
  border: 1px solid rgba(61, 130, 246, 0.2);
  padding: 1rem;
  border-radius: 12px;
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.5;
}

.footer-note {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 1rem;
  text-align: center;
}

@media (max-width: 650px) {
  .pair {
    grid-template-columns: 1fr;
  }
  
  .row.inline {
    grid-template-columns: 1fr;
  }
  
  h1 {
    font-size: 2rem;
  }
}