:root {
  --bg: #f3f7ff;
  --bg-glow: #e0edff;
  --surface: #ffffff;
  --surface-soft: #f7f9ff;
  --text: #111827;
  --muted: #4b5563;
  --border: #dbe2f3;
  --accent: #1d4ed8;
  --accent-soft: #dbeafe;
  --danger: #b91c1c;
  --success: #0f766e;
  --topbar-bg: rgba(255, 255, 255, 0.9);
}

body[data-theme="dark"] {
  --bg: #0b1220;
  --bg-glow: #17233a;
  --surface: #121b2b;
  --surface-soft: #0f1727;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #243247;
  --accent: #60a5fa;
  --accent-soft: #1a2e4d;
  --danger: #f87171;
  --success: #34d399;
  --topbar-bg: rgba(9, 14, 23, 0.9);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, var(--bg-glow) 0, var(--bg) 40%);
}

h1,
h2,
h3,
p {
  margin: 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--topbar-bg);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 3;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-control {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--muted);
}

.theme-control select {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  font: inherit;
  color: var(--text);
  background: var(--surface);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand h1 {
  font-size: 1.2rem;
}

.brand p {
  font-size: 0.8rem;
  color: var(--muted);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, #2563eb, #0891b2);
  font-weight: 700;
}

.main-nav {
  display: flex;
  gap: 8px;
}

.nav-btn,
.ghost-btn,
.primary-btn {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.9rem;
  cursor: pointer;
  background: var(--surface);
  color: var(--text);
}

.with-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
}

.with-icon::before {
  content: attr(data-icon);
  font-size: 0.92em;
  line-height: 1;
}

.nav-btn.active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, #2563eb, #0891b2);
}

.page {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

#homeView.active {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
}

.panel {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 14px;
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 78px;
}

.profession-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 10px 0 12px;
}

.profession-btn {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.8rem;
  background: var(--surface-soft);
  color: var(--text);
  cursor: pointer;
}

.profession-btn.active {
  color: #fff;
  border-color: transparent;
  background: #1d4ed8;
}

.field {
  display: grid;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--muted);
}

.field input,
.field select {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font: inherit;
  color: var(--text);
  background: var(--surface-soft);
}

.category-list {
  margin-top: 12px;
  display: grid;
  gap: 8px;
  max-height: 62vh;
  overflow: auto;
}

.category-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  cursor: pointer;
  background: var(--surface-soft);
  color: var(--text);
}

.category-item.active {
  border-color: #93c5fd;
  background: var(--accent-soft);
}

.category-item strong {
  display: block;
  font-size: 0.95rem;
}

.category-item span {
  font-size: 0.75rem;
  color: var(--muted);
}

.converter-panel {
  display: grid;
  gap: 12px;
}

.converter-head,
.view-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.converter-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.field-full {
  grid-column: 1 / -1;
}

.primary-btn {
  color: #fff;
  border: 0;
  background: linear-gradient(135deg, #2563eb, #0891b2);
}

#swapUnitsBtn {
  grid-column: 1/-1;
  justify-self: center;
  align-self: center;
}

.converter-form .field:not(.field-full) {
  font-size: 1.50rem;
  font-weight: 600;
  text-align: center;
}

.converter-form .field:not(.field-full) select {
  font-size: 1.2rem;
  text-align: left;
}

.result-card,
.info-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: var(--surface-soft);
}

.result-card {
  display: flex;
  flex-direction: column;
}

.result-card p {
  font-size: 0.8rem;
  color: var(--muted);
}

.result-card h3 {
  margin-top: 14px;
  color: var(--success);
  font-size: 1.5rem;
}

#inputValue {
  font-size: 1.5rem;
}

.error-text {
  margin-top: 6px;
  color: var(--danger);
  min-height: 1.1em;
}

.result-meta {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

#copyResultBtn {
  margin-top: 26px;
  align-self: flex-start;
}

.info-card h3 {
  margin-bottom: 8px;
}

.info-card pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: Consolas, monospace;
  font-size: 0.86rem;
}

.info-card p {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 7px;
}

.info-card ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
  font-size: 0.88rem;
}

.entry-list {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.entry {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: grid;
  gap: 7px;
  background: var(--surface-soft);
}

.entry strong {
  font-size: 0.95rem;
}

.entry p {
  color: var(--muted);
  font-size: 0.82rem;
}

.entry-actions {
  display: flex;
  gap: 8px;
}

body[data-theme="dark"] .profession-btn {
  background: #162132;
  border-color: #2b3c57;
  color: #dbeafe;
}

body[data-theme="dark"] .category-item {
  background: #121d2f;
  border-color: #2a3a54;
  color: #e5e7eb;
}

body[data-theme="dark"] .category-item strong {
  color: #f3f4f6;
}

body[data-theme="dark"] .category-item span {
  color: #cbd5e1;
}

body[data-theme="dark"] .category-item.active {
  background: #1d3354;
  border-color: #60a5fa;
}

@media (max-width: 1024px) {
  #homeView.active {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 600px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .top-actions {
    width: 100%;
    justify-content: space-between;
  }

  .converter-form {
    grid-template-columns: 1fr;
  }
}