:root {
  --bg: #f6f8fb;
  --panel: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --primary: #1f6feb;
  --positive: #16a34a;
  --negative: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar h1 {
  margin: 0;
  font-size: 1.15rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.topbar-actions a {
  text-decoration: none;
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 57px);
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.15rem 0.35rem;
}

.page-item.active {
  background: #eaf2ff;
  border-color: #bfdbfe;
}

.page-tab {
  flex: 1;
  text-align: left;
  background: none;
  border: none;
  padding: 0.45rem 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
  color: inherit;
}

.page-actions {
  display: flex;
  gap: 0.2rem;
}

.add-isin {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.add-isin input {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  text-transform: uppercase;
}

.content {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.placeholder {
  color: var(--muted);
  text-align: center;
  padding: 3rem 1rem;
}

.placeholder.error {
  color: var(--negative);
}

.entry {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem 1rem;
}

.entry-head {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.entry-title {
  margin: 0;
  font-size: 1.05rem;
}

.entry-meta {
  color: var(--muted);
  font-size: 0.8rem;
  flex: 1;
}

.entry-remove {
  align-self: center;
}

.entry-error {
  color: var(--negative);
  margin-top: 0.5rem;
}

.entry-body {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 1rem;
  margin-top: 0.6rem;
  align-items: start;
}

.chart {
  min-width: 0;
}

.variations {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.var-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.var-period {
  color: var(--muted);
  font-size: 0.85rem;
}

.var-value {
  font-weight: 600;
  font-size: 0.95rem;
}

.var-value.positive {
  color: var(--positive);
}

.var-value.negative {
  color: var(--negative);
}

.var-price {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  padding-top: 0.25rem;
}

.btn {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 6px;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
  font-size: 0.85rem;
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-danger {
  color: var(--negative);
}

.btn-small {
  padding: 0.2rem 0.45rem;
}

.login {
  max-width: 320px;
  margin: 12vh auto 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.login h1 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  text-align: center;
}

.login form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.login label {
  font-size: 0.9rem;
  color: var(--muted);
}

.login input[type="password"] {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
}

.login-error {
  color: var(--negative);
  margin: 0;
  font-size: 0.85rem;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .entry-body {
    grid-template-columns: 1fr;
  }
}