:root {
  --bg: #f6faf6;
  --surface: #ffffff;
  --text: #25291f;
  --muted: #7c8a75;
  --primary: #4f8a5b;
  --primary-dark: #3c6b46;
  --border: #dfe8df;
  --accent-bg: #eaf2ea;
  --danger: #c0463a;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }

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

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  flex-wrap: wrap;
}

.topbar h1 {
  font-size: 1.25rem;
  margin: 0;
}

#searchInput {
  flex: 1;
  max-width: 320px;
  min-width: 160px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.95rem;
  background: var(--accent-bg);
}

#searchInput:focus { outline: 2px solid var(--primary); }

.layout {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: 24px;
  padding: 20px;
  align-items: flex-start;
}

.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  position: sticky;
  top: 80px;
}

.sidebar-header {
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.topic-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.topic-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}

.topic-item:hover { background: var(--accent-bg); }
.topic-item.active { background: var(--primary); color: #fff; }
.topic-item.active .topic-count { color: rgba(255,255,255,0.85); }
.topic-item.active .topic-edit-btn { color: #fff; }

.topic-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.95rem;
}

.topic-count {
  font-size: 0.8rem;
  color: var(--muted);
}

.topic-edit-btn {
  border: none;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 2px 4px;
  border-radius: 4px;
  visibility: hidden;
}

.topic-item:hover .topic-edit-btn { visibility: visible; }

.new-topic-form {
  display: flex;
  gap: 6px;
  margin-top: 10px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

.new-topic-form input {
  flex: 1;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  min-width: 0;
}

.new-topic-form button {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  width: 32px;
  cursor: pointer;
  font-size: 1.1rem;
}

.sidebar-toggle {
  display: none;
  margin: 0 20px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.9rem;
}

.content {
  flex: 1;
  min-width: 0;
}

.primary-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 0.95rem;
  cursor: pointer;
}

.primary-btn:hover { background: var(--primary-dark); }

.secondary-btn {
  background: var(--accent-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 0.95rem;
  cursor: pointer;
}

.danger-btn {
  background: none;
  color: var(--danger);
  border: 1px solid var(--danger);
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 0.95rem;
  cursor: pointer;
  margin-left: auto;
}

.add-link-section { margin-bottom: 24px; }

.add-link-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow);
}

.add-link-form input,
.add-link-form textarea {
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  width: 100%;
}

.topic-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.topic-chip {
  border: 1px solid var(--border);
  background: var(--accent-bg);
  border-radius: 16px;
  padding: 5px 12px;
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
}

.topic-chip.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.form-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.current-view h2 {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 14px;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.link-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: grab;
}

.link-card.dragging { opacity: 0.4; }
.link-card.drag-over { border-color: var(--primary); }

.link-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}

.link-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  text-decoration: none;
  word-break: break-word;
}

.link-title:hover { color: var(--primary); }

.link-edit-btn {
  border: none;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.link-url {
  font-size: 0.78rem;
  color: var(--muted);
  word-break: break-all;
}

.link-note {
  font-size: 0.88rem;
  color: var(--text);
  white-space: pre-wrap;
}

.link-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 4px;
}

.link-tag {
  font-size: 0.72rem;
  background: var(--accent-bg);
  color: var(--muted);
  border-radius: 10px;
  padding: 2px 9px;
}

.empty-state {
  color: var(--muted);
  text-align: center;
  padding: 40px 0;
}

.hidden { display: none !important; }

.connection-error {
  max-width: 1100px;
  margin: 12px auto 0;
  padding: 12px 20px;
  background: #fdecea;
  color: var(--danger);
  border: 1px solid #f3c4be;
  border-radius: 8px;
  font-size: 0.9rem;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  max-width: 420px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}

.modal h3 { margin-top: 0; }

.install-help .install-steps {
  margin: 0 0 14px;
  padding-left: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--text);
  font-size: 0.95rem;
}

.install-help-hint {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 16px;
}

.install-help .primary-btn {
  width: 100%;
}

#editLinkForm {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#editLinkForm input,
#editLinkForm textarea {
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  width: 100%;
}

@media (max-width: 720px) {
  .layout { flex-direction: column; padding: 12px; }
  .sidebar {
    width: 100%;
    position: static;
    display: none;
  }
  .sidebar.open { display: block; }
  .sidebar-toggle { display: block; }
}

.logout-link {
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}

.logout-link:hover { color: var(--primary); }

.install-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 8px 16px;
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
}

.install-btn:hover { background: var(--primary-dark); }

.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  width: 100%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: center;
}

.login-form h1 {
  font-size: 1.2rem;
  margin: 0 0 8px;
}

.login-form input {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
}

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