/* ============================================================
   Native IT Design System - Theme Designer
   Styles prefixed with `td-` to avoid collisions
   ============================================================ */

/* ── Reset / base ──────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: #e6edf3;
  background: #0d1117;
}

/* ── CSS custom properties ─────────────────────────────────── */
:root {
  --td-bg:          #0d1117;
  --td-panel:       #161b22;
  --td-panel-raise: #1c2128;
  --td-border:      #30363d;
  --td-border-soft: #21262d;
  --td-text:        #e6edf3;
  --td-text-muted:  #7d8590;
  --td-text-faint:  #484f58;
  --td-accent:      #58a6ff;
  --td-accent-bg:   rgba(88, 166, 255, 0.1);
  --td-success:     #3fb950;
  --td-danger:      #f85149;
  --td-radius-sm:   3px;
  --td-radius:      6px;
  --td-radius-lg:   10px;
  --td-toolbar-h:   48px;
  --td-tabs-h:      42px;
  --td-sidebar-w:   340px;
  --td-shadow:      0 8px 32px rgba(0,0,0,0.4);
}

/* ── Screen reader only ────────────────────────────────────── */
.td-sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── Toolbar ───────────────────────────────────────────────── */
.td-toolbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--td-toolbar-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  background: var(--td-panel);
  border-bottom: 1px solid var(--td-border);
  z-index: 200;
}

.td-toolbar__start,
.td-toolbar__end {
  display: flex; align-items: center; gap: 10px;
}

.td-toolbar__back {
  display: inline-flex; align-items: center; gap: 5px;
  color: var(--td-text-muted);
  font-size: 13px; font-weight: 500;
  text-decoration: none;
  padding: 4px 8px;
  border-radius: var(--td-radius-sm);
  transition: color 0.15s, background 0.15s;
}
.td-toolbar__back:hover { color: var(--td-text); background: var(--td-border-soft); }

.td-toolbar__divider {
  width: 1px; height: 18px;
  background: var(--td-border);
  flex-shrink: 0;
}

.td-toolbar__title {
  font-size: 14px; font-weight: 600;
  color: var(--td-text);
  letter-spacing: -0.01em;
}

/* ── Layout ────────────────────────────────────────────────── */
.td-layout {
  display: grid;
  grid-template-columns: var(--td-sidebar-w) 1fr;
  height: 100vh;
  padding-top: var(--td-toolbar-h);
}

/* ── Sidebar ───────────────────────────────────────────────── */
.td-sidebar {
  display: flex; flex-direction: column;
  background: var(--td-panel);
  border-right: 1px solid var(--td-border);
  overflow: hidden;
}

/* ── Tab nav ───────────────────────────────────────────────── */
.td-tabs {
  display: flex; flex-shrink: 0;
  border-bottom: 1px solid var(--td-border);
  background: var(--td-panel);
}

.td-tab {
  flex: 1;
  padding: 0 12px;
  height: var(--td-tabs-h);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--td-text-muted);
  font-family: inherit; font-size: 13px; font-weight: 500;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.td-tab:hover { color: var(--td-text); }
.td-tab.active {
  color: var(--td-accent);
  border-bottom-color: var(--td-accent);
}

/* ── Tab pane ──────────────────────────────────────────────── */
.td-tab-pane {
  flex: 1; overflow-y: auto;
  padding: 0 0 24px;
}
.td-tab-pane[hidden] { display: none; }

/* ── Groups ────────────────────────────────────────────────── */
.td-group {
  padding: 16px;
  border-bottom: 1px solid var(--td-border-soft);
}
.td-group:last-child { border-bottom: none; }

.td-group__title {
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--td-text-muted);
  margin-bottom: 10px;
}

.td-group__hint {
  font-size: 12px; color: var(--td-text-muted);
  margin-top: -6px; margin-bottom: 10px;
  line-height: 1.4;
}

.td-preset-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.td-preset-btn {
  min-width: 88px;
  justify-content: center;
}

.td-preset-btn.is-active {
  background: var(--td-accent-bg);
  border-color: rgba(88, 166, 255, 0.3);
  color: var(--td-accent);
}

/* ── Buttons ───────────────────────────────────────────────── */
.td-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px;
  border: 1px solid transparent;
  border-radius: var(--td-radius-sm);
  font-family: inherit; font-size: 13px; font-weight: 600;
  cursor: pointer; white-space: nowrap;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.td-btn--primary {
  background: #238636;
  border-color: rgba(240,246,252,0.1);
  color: #fff;
}
.td-btn--primary:hover { background: #2ea043; }
.td-btn--ghost {
  background: transparent;
  border-color: var(--td-border);
  color: var(--td-text-muted);
}
.td-btn--ghost:hover { background: var(--td-border-soft); color: var(--td-text); border-color: var(--td-border); }
.td-btn--sm { padding: 4px 10px; font-size: 12px; }

/* ── Select ────────────────────────────────────────────────── */
.td-select {
  width: 100%;
  padding: 6px 10px;
  background: var(--td-bg);
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  color: var(--td-text);
  font-family: inherit; font-size: 13px;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237d8590' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}
.td-select:focus { outline: none; border-color: var(--td-accent); }

/* ── Hex input ─────────────────────────────────────────────── */
.td-hex-input {
  flex: 1;
  padding: 6px 10px;
  background: var(--td-bg);
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  color: var(--td-text);
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 12px; font-weight: 500;
  letter-spacing: 0.04em;
}
.td-hex-input:focus { outline: none; border-color: var(--td-accent); }
.td-hex-input--sm { width: 88px; flex: none; }

/* ── Native color input ─────────────────────────────────────── */
.td-color-input {
  width: 36px; height: 36px;
  padding: 2px;
  background: var(--td-bg);
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}
.td-color-input::-webkit-color-swatch-wrapper { padding: 0; }
.td-color-input::-webkit-color-swatch { border: none; border-radius: 2px; }

/* ── Primary color main control ─────────────────────────────── */
.td-color-main {
  display: flex; align-items: center; gap: 10px;
}
.td-color-main__swatch {
  width: 48px; height: 48px;
  border-radius: var(--td-radius);
  border: 2px solid rgba(255,255,255,0.12);
  flex-shrink: 0;
  background: #279fed;
  transition: background 0.2s;
}
.td-color-main__inputs {
  display: flex; align-items: center; gap: 8px; flex: 1;
}

/* ── Scheme palette swatches ─────────────────────────────────── */
.td-palette {
  display: flex; gap: 6px; flex-wrap: wrap;
  margin-top: 12px;
}
.td-swatch {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  flex: 1; min-width: 40px;
}
.td-swatch__color {
  width: 100%; min-width: 36px; height: 36px;
  border-radius: var(--td-radius-sm);
  border: 1px solid rgba(255,255,255,0.1);
  transition: transform 0.15s;
}
.td-swatch:hover .td-swatch__color { transform: scale(1.08); }
.td-swatch__label {
  font-size: 10px; color: var(--td-text-faint);
  text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 100%;
}

/* ── Individual color list ───────────────────────────────────── */
.td-color-list { display: flex; flex-direction: column; gap: 6px; }

.td-color-row {
  display: flex; align-items: center; gap: 8px;
}
.td-color-row input[type="color"] {
  width: 28px; height: 28px;
  padding: 2px; flex-shrink: 0;
  background: var(--td-bg);
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  cursor: pointer;
}
.td-color-row input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.td-color-row input[type="color"]::-webkit-color-swatch { border: none; border-radius: 1px; }
.td-color-row__label {
  flex: 1; font-size: 13px; color: var(--td-text-muted);
}

/* ── Font selector ───────────────────────────────────────────── */
.td-font-search {
  width: 100%; padding: 7px 10px;
  background: var(--td-bg);
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  color: var(--td-text);
  font-family: inherit; font-size: 13px;
  margin-bottom: 6px;
}
.td-font-search:focus { outline: none; border-color: var(--td-accent); }
.td-font-search::-webkit-search-cancel-button { -webkit-appearance: none; }

.td-font-list {
  max-height: 180px; overflow-y: auto;
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  background: var(--td-bg);
}

.td-font-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 10px;
  cursor: pointer;
  font-size: 14px;
  border-bottom: 1px solid var(--td-border-soft);
  transition: background 0.1s;
  user-select: none;
}
.td-font-item:last-child { border-bottom: none; }
.td-font-item:hover { background: var(--td-panel-raise); }
.td-font-item.selected { background: var(--td-accent-bg); color: var(--td-accent); }

.td-font-item__name { font-size: 14px; line-height: 1.3; }
.td-font-item__badge {
  font-size: 10px; font-family: Inter, sans-serif; font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase;
  padding: 2px 5px;
  border-radius: 3px;
  flex-shrink: 0;
  background: var(--td-border-soft);
  color: var(--td-text-faint);
}
.td-font-item.selected .td-font-item__badge { background: var(--td-accent-bg); color: var(--td-accent); }

.td-font-preview-strip {
  margin-top: 8px; padding: 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--td-border-soft);
  border-radius: var(--td-radius-sm);
}
.td-font-preview-label {
  display: block; font-size: 11px; color: var(--td-text-faint); margin-bottom: 5px;
}
.td-font-preview-label strong { color: var(--td-text-muted); font-weight: 500; }
.td-font-preview {
  font-size: 16px; line-height: 1.4;
  color: var(--td-text);
  word-break: break-word;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Options / form controls ─────────────────────────────────── */
.td-fieldset {
  border: none;
  display: flex; flex-direction: column; gap: 6px;
}
.td-radio {
  display: flex; align-items: center; gap: 8px;
  cursor: pointer; font-size: 13px; color: var(--td-text-muted);
}
.td-radio input[type="radio"] { accent-color: var(--td-accent); cursor: pointer; }
.td-radio:has(input:checked) { color: var(--td-text); }

.td-slider-row {
  display: flex; align-items: center; gap: 10px;
}
.td-range {
  flex: 1;
  accent-color: var(--td-accent);
  cursor: pointer;
}
.td-range-value {
  font-size: 12px; font-family: "JetBrains Mono", monospace;
  color: var(--td-text-muted); width: 52px; text-align: right; flex-shrink: 0;
}

/* ── Preview pane ────────────────────────────────────────────── */
.td-preview {
  display: flex; flex-direction: column;
  background: var(--td-bg);
  overflow: hidden;
}

.td-preview-bar {
  display: flex; align-items: center; gap: 8px;
  height: 40px; padding: 0 12px;
  border-bottom: 1px solid var(--td-border);
  background: var(--td-panel);
  flex-shrink: 0;
}

.td-preview-bar__label {
  font-size: 12px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--td-text-faint);
  margin-right: 4px;
}

.td-preview-bar__sizes {
  display: flex; gap: 2px; margin-right: auto;
}

.td-size-btn {
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  background: none; border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  color: var(--td-text-muted); cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.td-size-btn:hover { background: var(--td-border-soft); color: var(--td-text); }
.td-size-btn.active { background: var(--td-accent-bg); color: var(--td-accent); border-color: rgba(88,166,255,0.3); }

/* ── Viewport / iframe container ─────────────────────────────── */
.td-viewport {
  flex: 1; display: flex; align-items: flex-start; justify-content: center;
  overflow: auto; padding: 0;
  position: relative;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(88,166,255,0.05), transparent 50%),
    var(--td-bg);
}

.td-viewport[data-size="full"] .td-viewport__frame {
  width: 100%; height: 100%; border-radius: 0;
}
.td-viewport[data-size="tablet"] { padding: 24px; align-items: flex-start; }
.td-viewport[data-size="tablet"] .td-viewport__frame {
  width: 100%; max-width: 768px; height: calc(100vh - var(--td-toolbar-h) - 40px - 48px);
  border-radius: var(--td-radius);
  box-shadow: var(--td-shadow), 0 0 0 1px var(--td-border);
}
.td-viewport[data-size="mobile"] { padding: 24px; align-items: flex-start; }
.td-viewport[data-size="mobile"] .td-viewport__frame {
  width: 390px; height: calc(100vh - var(--td-toolbar-h) - 40px - 48px);
  border-radius: 16px;
  box-shadow: var(--td-shadow), 0 0 0 1px var(--td-border);
}

.td-viewport__frame {
  overflow: hidden; flex-shrink: 0;
  transition: width 0.25s, max-width 0.25s, border-radius 0.25s;
  background: #fff;
}

#previewIframe {
  width: 100%; height: 100%;
  border: none; display: block;
}

/* Tablet / mobile show actual iframe dimensions with scale */
.td-viewport[data-size="tablet"] #previewIframe { width: 100%; }
.td-viewport[data-size="mobile"] #previewIframe { width: 390px; }

/* ── Export modal ────────────────────────────────────────────── */
.td-modal {
  position: fixed; inset: 0;
  z-index: 500;
  display: flex; align-items: center; justify-content: center;
}
.td-modal[hidden] { display: none; }

.td-modal__backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
}

.td-modal__box {
  position: relative; z-index: 1;
  width: 700px; max-width: calc(100vw - 32px);
  max-height: calc(100vh - 64px);
  display: flex; flex-direction: column;
  background: var(--td-panel);
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-lg);
  box-shadow: var(--td-shadow), 0 0 0 1px rgba(255,255,255,0.04);
  overflow: hidden;
}

.td-modal__header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px 14px;
  border-bottom: 1px solid var(--td-border);
  flex-shrink: 0;
}
.td-modal__title { font-size: 16px; font-weight: 600; }
.td-modal__close {
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  background: none; border: none; color: var(--td-text-muted);
  cursor: pointer; border-radius: var(--td-radius-sm);
  transition: background 0.15s, color 0.15s;
}
.td-modal__close:hover { background: var(--td-border-soft); color: var(--td-text); }

.td-modal__tabs {
  display: flex; gap: 2px;
  padding: 8px 16px 0;
  border-bottom: 1px solid var(--td-border);
  flex-shrink: 0;
  background: var(--td-panel-raise);
}

.td-export-tab {
  padding: 7px 14px;
  background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--td-text-muted); font-family: inherit; font-size: 13px; font-weight: 500;
  cursor: pointer; margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
  border-radius: var(--td-radius-sm) var(--td-radius-sm) 0 0;
}
.td-export-tab:hover { color: var(--td-text); }
.td-export-tab.active { color: var(--td-accent); border-bottom-color: var(--td-accent); }

.td-modal__body {
  flex: 1; overflow: auto;
  padding: 0;
}

.td-code-block {
  margin: 0;
  padding: 16px 20px;
  background: #0d1117;
  font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  font-size: 12.5px; line-height: 1.7;
  color: #c9d1d9;
  white-space: pre;
  overflow-x: auto;
  min-height: 300px;
  tab-size: 2;
}

.td-modal__footer {
  display: flex; align-items: center; justify-content: flex-end; gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--td-border);
  background: var(--td-panel-raise);
  flex-shrink: 0;
}

/* ── Font settings panel ─────────────────────────────────────── */
.td-font-settings {
  margin-top: 8px;
  border: 1px solid var(--td-border-soft);
  border-radius: var(--td-radius-sm);
  background: var(--td-bg);
  overflow: hidden;
}

.td-font-settings__toggle {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 10px;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--td-text-faint);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color 0.15s, background 0.15s;
}
.td-font-settings__toggle::-webkit-details-marker { display: none; }
.td-font-settings__toggle::before {
  content: '▶';
  font-size: 8px;
  transition: transform 0.2s;
  flex-shrink: 0;
}
.td-font-settings[open] .td-font-settings__toggle::before { transform: rotate(90deg); }
.td-font-settings[open] .td-font-settings__toggle,
.td-font-settings__toggle:hover { color: var(--td-text-muted); }

.td-font-settings__body {
  padding: 10px;
  border-top: 1px solid var(--td-border-soft);
  display: flex; flex-direction: column; gap: 10px;
}

.td-font-setting-row {
  display: flex; flex-direction: column; gap: 4px;
}

.td-font-setting-label {
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--td-text-faint);
}

.td-select--compact {
  padding: 5px 8px;
  font-size: 12px;
}

/* Style toggle group */
.td-toggle-group {
  display: flex; gap: 4px;
}

.td-toggle {
  flex: 1;
  padding: 5px 8px;
  background: var(--td-bg);
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  color: var(--td-text-muted);
  font-family: inherit; font-size: 12px; font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.td-toggle:hover { background: var(--td-border-soft); color: var(--td-text); }
.td-toggle.active {
  background: var(--td-accent-bg);
  border-color: rgba(88, 166, 255, 0.3);
  color: var(--td-accent);
}

/* Color row for font color picker */
.td-font-color-row {
  display: flex; align-items: center; gap: 6px;
}

.td-color-input--sm {
  width: 26px; height: 26px;
  padding: 2px;
}

.td-font-color-clear {
  display: flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; flex-shrink: 0;
  background: none;
  border: 1px solid var(--td-border);
  border-radius: var(--td-radius-sm);
  color: var(--td-text-faint);
  font-size: 12px; line-height: 1;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.td-font-color-clear:hover {
  background: var(--td-border-soft);
  color: var(--td-danger);
  border-color: var(--td-danger);
}

/* ── Scrollbar styling ───────────────────────────────────────── */
.td-tab-pane::-webkit-scrollbar,
.td-font-list::-webkit-scrollbar,
.td-modal__body::-webkit-scrollbar { width: 6px; }
.td-tab-pane::-webkit-scrollbar-track,
.td-font-list::-webkit-scrollbar-track,
.td-modal__body::-webkit-scrollbar-track { background: transparent; }
.td-tab-pane::-webkit-scrollbar-thumb,
.td-font-list::-webkit-scrollbar-thumb,
.td-modal__body::-webkit-scrollbar-thumb {
  background: var(--td-border); border-radius: 3px;
}

/* ── Loading state for iframe ────────────────────────────────── */
.td-viewport__frame::before {
  content: 'Loading preview…';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; color: var(--td-text-faint);
  background: var(--td-bg);
  pointer-events: none;
}
.td-viewport__frame.loaded::before { display: none; }