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

:root {
  --bg: #F7F7FB;
  --surface: #FFFFFF;
  --surface-alt: #FBFAFE;
  --border: #E7E5F0;
  --border-strong: #D8D5E8;
  --text-primary: #1B1B23;
  --text-secondary: #6B6B76;
  --text-tertiary: #9997A6;
  --accent: #5B4FE8;
  --accent-hover: #4B3FD1;
  --accent-soft: #EEEBFC;
  --danger: #E5484D;
  --danger-soft: #FDEEEE;
  --radius-card: 16px;
  --radius-input: 10px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(20, 20, 30, 0.04);
  --shadow-md: 0 8px 24px rgba(20, 20, 30, 0.07);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14.5px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

/* ── Header ── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 32px 18px;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  flex-shrink: 0;
}

.app-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.4px;
}

.app-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}


/* ── Section nav (top chips) ── */
.sticky-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 5;
}

.section-nav {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 4px 20px 18px;
}

.nav-chip {
  border: none;
  background: none;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.nav-chip:hover { background: var(--surface-alt); color: var(--text-primary); }
.nav-chip.active { background: var(--accent-soft); color: var(--accent); }

/* ── Toolbar ── */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px 20px;
  flex-wrap: wrap;
}

.mode-toggle {
  display: flex;
  gap: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 3px;
  border-radius: var(--radius-pill);
}

.mode-btn {
  padding: 7px 16px;
  border: none;
  border-radius: var(--radius-pill);
  background: none;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.mode-btn.active { background: var(--accent); color: #fff; }

.saved-briefs {
  display: flex;
  align-items: center;
  gap: 6px;
}

.autosave-indicator {
  display: block;
  text-align: center;
  font-size: 11px;
  color: var(--text-tertiary);
  padding: 0 20px 8px;
}

.icon-btn {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-input);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
}
.icon-btn:hover { border-color: var(--border-strong); color: var(--text-primary); }

/* ── Main ── */
.app-main {
  flex: 1;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px 40px;
}

.hidden { display: none !important; }

/* ── Section cards ── */
.section-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
  padding: 26px 28px;
  margin-bottom: 20px;
  scroll-margin-top: 90px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.card-header-toggle {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  text-align: left;
  margin-bottom: 0;
}
.card-header-toggle .chevron {
  color: var(--text-tertiary);
  transition: transform 0.2s;
  flex-shrink: 0;
}
.card-header-toggle.expanded .chevron { transform: rotate(180deg); }
.card-header-toggle.expanded { margin-bottom: 18px; }

.card-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.card-subtitle {
  display: block;
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 400;
  margin-top: 2px;
}

.subsection-title {
  font-size: 12.5px;
  font-weight: 700;
  margin: 18px 0 10px;
  color: var(--text-primary);
}

.field-hint-inline {
  font-size: 11px;
  font-weight: 400;
  color: var(--text-tertiary);
}

/* ── Collapsible (References / AI Context) ── */
.collapsible-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
}
.collapsible-body.expanded { grid-template-rows: 1fr; }
.collapsible-inner { overflow: hidden; min-height: 0; }

/* ── Inline expander ("+ Add more details") ── */
.expander { margin-top: 8px; }
.expander-toggle {
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 0;
}
.expander-toggle:hover { color: var(--accent-hover); }
.expander-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
}
.expander-body.expanded { grid-template-rows: 1fr; margin-top: 6px; }
.expander-inner { overflow: hidden; min-height: 0; }

/* ── Fields ── */
.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field-wide { grid-column: 1 / -1; }

.field-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}
.field-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.req { color: var(--accent); }

.input {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 13.5px;
  padding: 10px 13px;
  width: 100%;
  accent-color: var(--accent);
}
.input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.input-sm { padding: 7px 11px; font-size: 12.5px; }

.textarea { resize: vertical; font-family: var(--font); }
.readonly-preview { color: var(--text-secondary); background: var(--surface-alt); }

.field-error {
  font-size: 11px;
  color: var(--danger);
  min-height: 14px;
}

.field-hint {
  font-size: 11.5px;
  color: var(--text-tertiary);
  margin: 6px 0 12px;
}

.quick-add-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font);
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  padding: 2px 6px;
}
.quick-add-btn:hover { color: var(--accent-hover); }

.quick-add-box {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}
.quick-add-box textarea { flex: 1; }
.quick-add-box-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* ── Tone sliders ── */
.tone-block { margin-top: 4px; }

.slider-row {
  display: grid;
  grid-template-columns: 56px 1fr 56px;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.slider-end-label {
  font-size: 11px;
  color: var(--text-tertiary);
  text-align: center;
}

.tone-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--border-strong);
  border-radius: 2px;
  outline: none;
  accent-color: var(--accent);
}
.tone-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(20, 20, 30, 0.25);
  cursor: pointer;
}
.tone-slider::-moz-range-thumb {
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(20, 20, 30, 0.25);
  cursor: pointer;
}

.tone-preview {
  background: var(--accent-soft);
  border-radius: var(--radius-input);
  padding: 10px;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 14px;
  overflow: hidden;
}
.tone-preview-photo {
  width: 96px;
  height: 68px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--border);
  flex-shrink: 0;
}
.tone-preview-text { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.tone-preview strong { color: var(--accent); }
.tone-preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 11.5px;
  color: var(--text-secondary);
}

/* ── Photo cards (shared: tone preview, type cards, checklist items) ── */
.photo-card.photo-failed .tone-preview-photo,
.photo-card.photo-failed .type-card-photo,
.photo-card.photo-failed .checklist-photo {
  display: none;
}
.photo-card.photo-failed.tone-preview { padding: 12px 14px; }

/* ── Project type cards ── */
.type-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 10px;
}
.type-card {
  display: flex;
  flex-direction: column;
  background: var(--surface-alt);
  border: 2px solid var(--border);
  border-radius: var(--radius-input);
  overflow: hidden;
  cursor: pointer;
  padding: 0;
  font-family: var(--font);
  transition: border-color 0.15s;
}
.type-card:hover { border-color: var(--border-strong); }
.type-card.selected { border-color: var(--accent); }
.type-card-photo {
  width: 100%;
  height: 64px;
  object-fit: cover;
  background: var(--border);
  display: block;
}
.type-card-label {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-primary);
  padding: 8px 9px;
  text-align: left;
}
.type-card.selected .type-card-label { color: var(--accent); }
.type-card.photo-failed { padding-top: 0; }
.type-card.photo-failed .type-card-label { padding-top: 12px; }

/* ── Checklist / tag builder ── */
.checklist-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 12px;
}
.checklist-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  padding: 8px 11px;
  cursor: pointer;
  transition: border-color 0.15s;
}
.checklist-item:hover { border-color: var(--border-strong); }
.checklist-photo {
  width: 40px;
  height: 30px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--border);
  flex-shrink: 0;
}

.preset-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}
.preset-chip {
  background: var(--surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 12px;
  padding: 6px 12px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.preset-chip:hover { border-color: var(--accent); color: var(--accent); }

.tag-builder { margin-bottom: 8px; }
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}
.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  padding: 5px 8px 5px 12px;
}
.tag-pill-remove {
  background: none;
  border: none;
  color: #fff;
  opacity: 0.8;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
}
.tag-pill-remove:hover { opacity: 1; }
.readonly-tags .tag-pill { background: var(--accent-soft); color: var(--accent); }

.tag-input {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 13.5px;
  padding: 9px 13px;
  width: 100%;
}
.tag-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ── References ── */
.reference-upload-row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 10px;
}
.btn-file { cursor: pointer; }
.url-add-row {
  display: flex;
  gap: 8px;
  flex: 1;
  min-width: 220px;
}
.url-add-row .input { flex: 1; }

.reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.reference-card {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  cursor: grab;
}
.reference-card.dragging { opacity: 0.4; }

.reference-thumb {
  width: 100%;
  height: 150px;
  object-fit: cover;
  background: var(--border);
  display: block;
  cursor: zoom-in;
  transition: opacity 0.15s;
}
.reference-thumb:hover { opacity: 0.9; }
.reference-link-thumb {
  width: 100%;
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent-soft);
  font-size: 12px;
  color: var(--accent);
  padding: 8px;
  text-align: center;
  word-break: break-all;
}
.reference-link-thumb img { width: 16px; height: 16px; flex-shrink: 0; }

.reference-card-body {
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.reference-caption {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 11.5px;
  font-family: var(--font);
  padding: 2px 0;
  width: 100%;
}
.reference-caption:focus { outline: none; }
.reference-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.reference-remove {
  background: none;
  border: none;
  color: var(--danger);
  font-size: 11px;
  cursor: pointer;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius-input);
  border: none;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, background 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.btn:active { opacity: 0.85; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover:not(:disabled) { background: var(--accent-hover); }

.btn-ghost { background: var(--surface); color: var(--text-primary); border: 1px solid var(--border); }
.btn-ghost:hover:not(:disabled) { border-color: var(--border-strong); }

.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-pill { border-radius: var(--radius-pill); }

/* ── Bottom bar ── */
.bottom-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  border-top: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
  flex-wrap: wrap;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}

.status-label {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-left: auto;
}

/* ── Guided Chat ── */
.chat-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 20px;
  align-items: start;
}

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

.chat-thread {
  max-height: 46vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-right: 4px;
}

.chat-bubble {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: var(--radius-card);
  font-size: 13.5px;
  line-height: 1.5;
}
.chat-bubble.bot { background: var(--surface-alt); border: 1px solid var(--border); align-self: flex-start; }
.chat-bubble.user { background: var(--accent); color: #fff; align-self: flex-end; }

.chat-input-row {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}
.chat-input-row .input { flex: 1; }

.chat-sidebar { max-height: 60vh; overflow-y: auto; }
.chat-progress { display: flex; flex-direction: column; gap: 10px; margin-top: 10px; }
.chat-progress-item { font-size: 12px; }
.chat-progress-item strong {
  display: block;
  color: var(--text-tertiary);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

/* ── NL Import ── */
#nlImportModePanel .textarea { margin: 12px 0; }
.nl-import-result { margin-top: 20px; }
.nl-match-list { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.nl-match-list li {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  padding: 8px 10px;
  font-size: 12px;
}
.nl-match-list b { color: var(--accent); }

/* ── Lightbox ── */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(20, 20, 30, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  z-index: 100;
}
.lightbox-image {
  max-width: 100%;
  max-height: 100%;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-md);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.25); }

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 76px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text-primary);
  color: #fff;
  padding: 11px 20px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 50;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  body { font-size: 14px; }

  .app-header { padding: 16px 16px 10px; }
  .app-title { font-size: 19px; }

  /* Horizontally scrollable chip nav instead of wrapping to multiple lines */
  .section-nav {
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 4px 16px 14px;
    scrollbar-width: none;
  }
  .section-nav::-webkit-scrollbar { display: none; }
  .nav-chip { flex-shrink: 0; }

  .toolbar { flex-direction: column; align-items: stretch; padding: 0 16px 16px; gap: 10px; }
  .mode-toggle { width: 100%; overflow-x: auto; justify-content: flex-start; }
  .mode-btn { flex-shrink: 0; padding: 8px 13px; font-size: 12.5px; }
  .saved-briefs { justify-content: stretch; }
  .saved-briefs select { flex: 1; }

  .app-main { padding: 0 16px 32px; }
  .section-card { padding: 18px; border-radius: 14px; }

  .field-grid { grid-template-columns: 1fr; }
  .checklist-grid { grid-template-columns: 1fr; }

  /* Prevent iOS auto-zoom on focus by keeping inputs at 16px */
  .input, .tag-input, .chat-input-row input { font-size: 16px; }

  /* Bigger touch targets */
  .btn { padding: 12px 18px; font-size: 14px; }
  .icon-btn { width: 42px; height: 42px; }
  .checklist-item { padding: 12px; }
  .preset-chip { padding: 9px 14px; }
  .quick-add-btn { padding: 8px 6px; }
  .expander-toggle { padding: 10px 0; display: inline-block; }
  .card-header-toggle { padding: 6px 0; }

  .tone-slider { height: 6px; }
  .tone-slider::-webkit-slider-thumb { width: 24px; height: 24px; }
  .tone-slider::-moz-range-thumb { width: 24px; height: 24px; }

  /* Photo selection cards */
  .type-card-grid { grid-template-columns: repeat(2, 1fr); }
  .tone-preview { flex-direction: column; align-items: stretch; }
  .tone-preview-photo { width: 100%; height: 90px; }
  .reference-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .lightbox { padding: 16px; }
  .lightbox-close { top: 12px; right: 12px; }

  /* Chat mode: stack thread above progress instead of side-by-side */
  .chat-layout { grid-template-columns: 1fr; }
  .chat-thread { max-height: 42vh; }

  /* Stack action buttons full-width, thumb-friendly */
  .bottom-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 8px;
  }
  .bottom-bar .btn { width: 100%; justify-content: center; }
  .status-label { margin-left: 0; width: 100%; text-align: center; }
}