:root {
  --bg-light: #f8fafc;
  --text-light: #1e293b;
  --card-light: rgba(255, 255, 255, 0.85);
  --primary-light: #3b82f6;
  --green-light: #10b981;
  --red-light: #ef4444;
  --neutral-light: #64748b;
  --border-light: rgba(0, 0, 0, 0.05);
  --shadow-light: 0 4px 20px rgba(0, 0, 0, 0.08);

  --bg-dark: #0f172a;
  --text-dark: #f1f5f9;
  --card-dark: rgba(30, 41, 59, 0.7);
  --primary-dark: #60a5fa;
  --green-dark: #34d399;
  --red-dark: #f87171;
  --neutral-dark: #94a3b8;
  --border-dark: rgba(255, 255, 255, 0.05);
  --shadow-dark: 0 4px 20px rgba(0, 0, 0, 0.2);

  --radius: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; padding: 0; margin: 0; }
body { font-family: 'Vazirmatn', sans-serif; background: var(--bg); color: var(--text); transition: var(--transition); min-height: 100vh; line-height: 1.6; }

body[data-theme="light"] {
  --bg: var(--bg-light); --text: var(--text-light); --card: var(--card-light); --primary: var(--primary-light); --green: var(--green-light); --red: var(--red-light); --neutral: var(--neutral-light); --border: var(--border-light); --shadow: var(--shadow-light);
}
body[data-theme="dark"] {
  --bg: var(--bg-dark); --text: var(--text-dark); --card: var(--card-dark); --primary: var(--primary-dark); --green: var(--green-dark); --red: var(--red-dark); --neutral: var(--neutral-dark); --border: var(--border-dark); --shadow: var(--shadow-dark);
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--green); }

header { padding: 1rem 2rem; display: flex; justify-content: space-between; align-items: center; backdrop-filter: blur(12px); background: var(--card); position: sticky; top: 0; z-index: 100; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); }
.logo { display: flex; align-items: center; gap: 12px; }
.logo i { font-size: 1.5rem; color: var(--primary); }
.header-actions { display: flex; gap: 1rem; align-items: center; }
.toggle-btn, .refresh-btn { background: none; border: none; color: var(--text); cursor: pointer; font-size: 1.2rem; transition: var(--transition); padding: 0.5rem; border-radius: 50%; width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; }
.toggle-btn:hover, .refresh-btn:hover { background: var(--border); color: var(--primary); }
.refresh-btn.loading { animation: spin 1s linear infinite; }
@keyframes spin { 100% { transform: rotate(360deg); } }

main { padding: 2rem 1rem; max-width: 1200px; margin: 0 auto; }
.category-container { margin-bottom: 2rem; }
.category-title { font-size: 1.5rem; font-weight: 700; color: var(--primary); margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--border); display: flex; align-items: center; gap: 0.8rem;}
.price-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 1rem; }
.card {
  background: var(--card);
  backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  transition: var(--transition);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  opacity: 0;
  animation: fadeIn 0.5s ease-out forwards;
}
.card::before { content: ''; position: absolute; top: 0; right: 0; width: 100%; height: 100%; background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0) 100%); pointer-events: none; }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15); }
.card-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}
.card-header { display: flex; align-items: center; gap: 0.75rem; }
.flag { font-size: 2rem; width: 50px; height: 50px; display: flex; align-items: center; justify-content: center; border-radius: 10px; background: var(--border); }
.currency-info { display: flex; flex-direction: column; gap: 0.15rem; }
.currency-name { font-size: 1rem; font-weight: 600; color: var(--text); }
.currency-code { font-size: 0.8rem; color: var(--text); opacity: 0.7; }
.price-container {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-top: auto;
  padding-top: 0;
  border-top: none;
  text-align: right;
  align-items: flex-end;
}
.price { font-size: 1.2rem; font-weight: 700; color: var(--text); direction: ltr; text-align: right; }
.sub-prices { font-size: 0.85rem; color: var(--neutral); text-align: right;}
.change { display: flex; align-items: center; gap: 0.3rem; font-size: 0.85rem; }
.change.up { color: var(--green); }
.change.down { color: var(--red); }
.change.neutral { color: var(--neutral); }
.change i { font-size: 0.75rem; }
.chart-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 0.5rem;
  width: 100%;
}
.chart-container svg { width: 100%; height: auto; }

.loading-container, .error-container { grid-column: 1 / -1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1rem; padding: 2rem; }
.loading-spinner { width: 40px; height: 40px; border: 4px solid var(--border); border-radius: 50%; border-top-color: var(--primary); animation: spin 1s ease-in-out infinite; }
.error-icon { font-size: 2.5rem; color: var(--red); }
.retry-btn { background: var(--primary); color: white; border: none; padding: 0.5rem 1.5rem; border-radius: 8px; cursor: pointer; font-family: inherit; font-weight: 500; transition: var(--transition); margin-top: 1rem; }
.retry-btn:hover { background: var(--green); transform: translateY(-2px); }

footer { text-align: center; padding: 1.5rem; font-size: 0.85rem; color: var(--text); opacity: 0.7; margin-top: 1.5rem; }
.footer-heart { color: var(--red); animation: pulse 1.5s infinite; }
@keyframes pulse { 50% { transform: scale(1.2); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.tooltip { position: relative; }
.tooltip:hover::after, .tooltip:hover::before { opacity: 1; transition-delay: 0.5s; }
.tooltip::after { content: attr(data-tooltip); position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg); padding: 0.5rem 1rem; border-radius: 6px; font-size: 0.8rem; white-space: nowrap; z-index: 10; margin-bottom: 0.5rem; opacity: 0; transition: opacity 0.2s; pointer-events: none; }
.tooltip::before { content: ''; position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%); border-width: 6px; border-style: solid; border-color: var(--text) transparent transparent transparent; margin-bottom: -0.5rem; z-index: 10; opacity: 0; transition: opacity 0.2s; pointer-events: none; }

@media (max-width: 768px) {
  header { padding: 1rem; }
  .price-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
  .card { padding: 1rem; }
  .flag { font-size: 1.8rem; width: 45px; height: 45px; }
  .price { font-size: 1.1rem; }
}

@media (max-width: 480px) {
  header { padding: 1rem; }
  .price-grid { grid-template-columns: 1fr; }
  .logo h1 { font-size: 1.2rem; }
  .card-header { flex-direction: row; align-items: center; }
  .flag { margin-bottom: 0; }
  .card { flex-direction: column; justify-content: flex-start; align-items: stretch; }
  .card-content { flex-direction: row; justify-content: space-between; align-items: center; }
  .price-container { text-align: right; align-items: flex-end; }
  .chart-container { padding-top: 0.5rem; }
}