:root {
  --font-family: "Manrope", "Segoe UI", sans-serif;
  --bg: #f2f6ff;
  --bg-elevated: rgba(255, 255, 255, 0.84);
  --surface: #ffffff;
  --surface-soft: #f7f9ff;
  --text: #172033;
  --text-muted: #5e6a84;
  --primary: #0a66ff;
  --primary-strong: #0048bf;
  --ring: rgba(10, 102, 255, 0.24);
  --border: #d7dff0;
  --danger: #d12f4a;
  --success: #147a50;
  --shadow: 0 18px 40px rgba(17, 34, 74, 0.12);
  --radius-lg: 24px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --transition: 220ms ease;
}

body[data-theme="dark"] {
  --bg: #090f1a;
  --bg-elevated: rgba(13, 20, 35, 0.84);
  --surface: #0f1729;
  --surface-soft: #141f35;
  --text: #e8efff;
  --text-muted: #9eaac6;
  --primary: #5d8fff;
  --primary-strong: #8dacff;
  --ring: rgba(93, 143, 255, 0.35);
  --border: #28354f;
  --danger: #ff7290;
  --success: #5cd29f;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-family);
  color: var(--text);
  background:
    radial-gradient(circle at 10% 10%, rgba(61, 145, 255, 0.14), transparent 35%),
    radial-gradient(circle at 90% 20%, rgba(47, 225, 185, 0.12), transparent 30%),
    var(--bg);
  line-height: 1.5;
  transition: background var(--transition), color var(--transition);
}

.container {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

.bg-orb {
  position: fixed;
  border-radius: 999px;
  filter: blur(55px);
  opacity: 0.45;
  pointer-events: none;
  z-index: -1;
}

.orb-a {
  width: 280px;
  height: 280px;
  top: 80px;
  left: -70px;
  background: linear-gradient(135deg, #69d4ff, #4f7fff);
}

.orb-b {
  width: 260px;
  height: 260px;
  bottom: 70px;
  right: -70px;
  background: linear-gradient(135deg, #41d7aa, #26a5ff);
}

.hero {
  padding-top: 1rem;
}

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

.brand {
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.2px;
  font-size: 1.2rem;
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
}

.hero__content {
  padding: 4.25rem 0 2rem;
}

.eyebrow {
  margin: 0;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1.7px;
  color: var(--primary);
  font-weight: 700;
}

.hero h1 {
  margin: 0.4rem 0 0;
  max-width: 18ch;
  font-size: clamp(1.95rem, 5vw, 3.2rem);
  line-height: 1.12;
}

.hero__lead {
  margin: 1rem 0 0;
  color: var(--text-muted);
  max-width: 62ch;
}

.main-layout {
  display: grid;
  gap: 1.2rem;
  padding-bottom: 3rem;
}

.converter-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 3vw, 1.8rem);
}

.card-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.card-heading h2 {
  margin: 0;
  font-size: clamp(1.25rem, 2.6vw, 1.7rem);
}

.status {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.65rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--surface);
}

.status--loading {
  color: var(--primary);
  border-color: var(--primary);
}

.status--error {
  color: var(--danger);
  border-color: var(--danger);
}

.status--success {
  color: var(--success);
  border-color: var(--success);
}

.converter-form {
  display: grid;
  gap: 1rem;
}

.field-group {
  display: grid;
  gap: 0.45rem;
}

label {
  font-weight: 600;
  font-size: 0.92rem;
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.72rem 0.82rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

input:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--ring);
}

input::placeholder {
  color: #95a0b7;
}

.feedback {
  margin: -0.15rem 0 0;
  min-height: 1.15rem;
  font-size: 0.82rem;
  color: var(--danger);
}

.currency-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.75rem;
  align-items: end;
}

.swap-btn {
  border: none;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #3da3ff);
  color: #fff;
  font-size: 1.35rem;
  cursor: pointer;
  align-self: center;
  transition: transform var(--transition), filter var(--transition);
}

.swap-btn:hover {
  transform: rotate(180deg) scale(1.05);
  filter: brightness(1.05);
}

.quick-amounts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.chip {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 0.4rem 0.82rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.chip:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.result-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: 1rem;
}

.result-label {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.84rem;
}

.result-value {
  margin: 0.35rem 0;
  font-size: clamp(1.7rem, 4vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.rate-details {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.result-actions {
  margin-top: 0.9rem;
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid transparent;
  border-radius: 11px;
  padding: 0.65rem 0.95rem;
  cursor: pointer;
  transition: transform var(--transition), filter var(--transition), border-color var(--transition), background var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary), #3ca5ff);
  color: #fff;
}

.btn--primary:hover {
  filter: brightness(1.04);
}

.btn--ghost {
  border-color: var(--border);
  color: var(--text);
  background: var(--surface-soft);
}

.btn--text {
  border: none;
  color: var(--text-muted);
  background: transparent;
  padding: 0.4rem 0.2rem;
}

.error-banner {
  border: 1px solid color-mix(in srgb, var(--danger) 50%, var(--border));
  background: color-mix(in srgb, var(--danger) 14%, var(--surface));
  color: var(--danger);
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
  font-size: 0.9rem;
}

.history {
  margin-top: 1.2rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.history__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.history__head h3 {
  margin: 0;
  font-size: 1.05rem;
}

.history__list {
  list-style: none;
  margin: 0.7rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.52rem;
}

.history__item {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  padding: 0.55rem 0.68rem;
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  font-size: 0.9rem;
}

.history__meta {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.info-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  backdrop-filter: blur(8px);
  padding: 1rem;
}

.info-card h2 {
  margin: 0;
  font-size: 1.1rem;
}

.info-card p,
.info-card ul {
  margin: 0.55rem 0 0;
  color: var(--text-muted);
}

.info-card ul {
  padding-left: 1rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.1rem 0 2rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

@media (max-width: 820px) {
  .currency-grid {
    grid-template-columns: 1fr;
  }

  .swap-btn {
    width: 100%;
    border-radius: 12px;
    height: 44px;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  .hero__content {
    padding-top: 3.1rem;
  }

  .converter-card {
    border-radius: 18px;
    padding: 0.9rem;
  }

  .result-actions .btn {
    flex: 1;
  }
}