:root {
  --bg: #0b1220;
  --card: rgba(255,255,255,0.05);
  --border: rgba(255,255,255,0.08);
  --accent: linear-gradient(135deg, #6ee7b7, #3b82f6);
  --text: #e6eef6;
  --muted: #9aa6bd;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #0f172a 0%, #0b1220 100%);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: var(--accent);
  color: #041016;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.app-header .logo {
  height: 48px;
}

.app-header h1 {
  margin: 0;
  font-size: 1.4rem;
}

.app-header p {
  margin: 0;
  font-size: 0.9rem;
}

.btn-refresh {
  background: #041016;
  color: white;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  transition: transform .2s, background .3s;
}
.btn-refresh:hover { background: #1e293b; transform: scale(1.05); }

.app-main {
  flex: 1;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
  padding: 20px 40px;
}

.market-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.market-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  padding: 14px;
  display: flex;
  gap: 12px;
  align-items: center;
  transition: transform .25s ease, box-shadow .25s ease;
  cursor: pointer;
}
.market-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}

.market-card img {
  width: 90px;
  height: 60px;
  object-fit: cover;
  border-radius: 8px;
}

.m-info h3 {
  margin: 0;
  font-size: 1rem;
}
.m-info p {
  margin: 4px 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.btn-main {
  background: var(--accent);
  border: none;
  color: #041016;
  padding: 10px 14px;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  flex: 1;
}
.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  flex: 1;
}

.controls {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

input, select {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
}
input:focus, select:focus { border-color: #60a5fa; }

.calculator {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  animation: slideIn 0.6s ease;
}
@keyframes slideIn {
  from { transform: translateX(50px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.row { display: flex; gap: 8px; }

.result-box {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-top: 14px;
  padding: 10px;
}
.hidden { display: none; }

.app-footer {
  text-align: center;
  padding: 14px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid rgba(255,255,255,0.04);
}

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