* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --tt-bg: #f0fdf4;
  --tt-card: #ffffff;
  --tt-surface: #ffffff;
  --tt-surface-hover: #dcfce7;
  --tt-text: #0f172a;
  --tt-muted: #64748b;
  --tt-accent: #059669;
  --tt-accent-hover: #047857;
  --tt-border: #bbf7d0;
  --tt-header: linear-gradient(135deg, #064e3b, #10b981);
  --tt-on-accent: #ffffff;
  --tt-header-input-bg: rgba(255, 255, 255, 0.14);
  --tt-header-input-border: rgba(255, 255, 255, 0.35);
  --tt-save-error: #b91c1c;
  --tt-grid-header: #ecfdf5;
  --tt-grid-border: #d1fae5;
  --tt-cell-focus: #6ee7b7;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --tt-bg: #022c22;
    --tt-card: #134e4a;
    --tt-surface: #134e4a;
    --tt-surface-hover: #115e59;
    --tt-text: #ecfdf5;
    --tt-muted: #99f6e4;
    --tt-accent: #34d399;
    --tt-accent-hover: #6ee7b7;
    --tt-border: #0f766e;
    --tt-header: linear-gradient(135deg, #022c22, #047857);
    --tt-grid-header: #134e4a;
    --tt-grid-border: #0f766e;
    --tt-cell-focus: #2dd4bf;
  }
}

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

.btn {
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: var(--tt-accent);
  color: var(--tt-on-accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:hover {
  background: var(--tt-accent-hover);
}

.btn.secondary {
  background: var(--tt-surface-hover);
  color: var(--tt-text);
}

.btn.secondary:hover {
  background: var(--tt-border);
}

.btn-icon {
  padding: 6px 10px;
  min-width: 44px;
  min-height: 44px;
}

.btn-icon img {
  display: block;
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 6px;
}

.card {
  background: var(--tt-card);
  border: 1px solid var(--tt-border);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-card {
  max-width: 420px;
  width: 100%;
  padding: 32px 28px;
  text-align: center;
}

.tt-brand-logo {
  display: block;
  object-fit: contain;
  border-radius: 12px;
}

.tt-brand-logo--login {
  width: 72px;
  height: 72px;
  margin: 0 auto 12px;
}

.subtitle {
  color: var(--tt-muted);
  font-size: 15px;
  line-height: 1.5;
}

.editor-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.editor-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: var(--tt-header);
  color: var(--tt-on-accent);
}

.editor-header-left,
.editor-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.table-title-input {
  min-width: 200px;
  max-width: min(480px, 50vw);
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--tt-header-input-border);
  background: var(--tt-header-input-bg);
  color: var(--tt-on-accent);
  font-size: 16px;
  font-weight: 600;
}

.table-title-input::placeholder {
  color: rgba(255, 255, 255, 0.65);
}

.save-status {
  font-size: 13px;
  opacity: 0.9;
}

.save-status.error {
  color: #fecaca;
}

.grid-toolbar-hint {
  padding: 6px 16px;
  font-size: 12px;
  color: var(--tt-muted);
  background: var(--tt-card);
  border-bottom: 1px solid var(--tt-border);
}

.grid-mount {
  flex: 1;
  overflow: auto;
  padding: 12px 16px 24px;
  background: var(--tt-bg);
}

.tt-grid {
  border-collapse: collapse;
  background: var(--tt-card);
  box-shadow: 0 2px 12px rgba(15, 23, 42, 0.08);
  font-size: 13px;
}

.tt-grid th,
.tt-grid td {
  border: 1px solid var(--tt-grid-border);
  padding: 0;
  min-width: 96px;
}

.tt-grid thead th {
  background: var(--tt-grid-header);
  color: var(--tt-muted);
  font-weight: 600;
  text-align: center;
  padding: 6px 8px;
  position: sticky;
  top: 0;
  z-index: 2;
}

.tt-corner {
  min-width: 48px;
  background: var(--tt-grid-header);
  position: sticky;
  left: 0;
  z-index: 3;
}

.tt-grid tbody th {
  background: var(--tt-grid-header);
  color: var(--tt-muted);
  font-weight: 600;
  text-align: center;
  padding: 4px 8px;
  min-width: 48px;
  position: sticky;
  left: 0;
  z-index: 1;
}

.tt-cell {
  width: 100%;
  min-width: 96px;
  border: none;
  padding: 6px 8px;
  font: inherit;
  background: transparent;
  color: var(--tt-text);
}

.tt-cell:focus {
  outline: 2px solid var(--tt-cell-focus);
  outline-offset: -2px;
  background: rgba(16, 185, 129, 0.08);
}

dialog {
  border: none;
  border-radius: 12px;
  padding: 0;
  max-width: 520px;
  width: calc(100% - 32px);
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.2);
}

dialog form {
  padding: 24px;
}

dialog h2 {
  margin: 0 0 8px;
  font-size: 18px;
}

.dialog-hint {
  color: var(--tt-muted);
  font-size: 14px;
  margin: 0 0 16px;
}

dialog label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

dialog input[type="text"] {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 8px 10px;
  border: 1px solid var(--tt-border);
  border-radius: 8px;
  font-size: 14px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

dialog::backdrop {
  background: rgba(15, 23, 42, 0.45);
}