/* ─────────────────────────────────────────────────────────────────
   SHFTX Analytics – Apple-inspired black & white UI
   ───────────────────────────────────────────────────────────────── */

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

#shftxan-app {
  --black:    #000000;
  --near-black: #111111;
  --dark:     #1c1c1e;
  --mid:      #3a3a3c;
  --subtle:   #636366;
  --border:   #d1d1d6;
  --bg-off:   #f5f5f7;
  --white:    #ffffff;
  --green:    #34c759;
  --red:      #ff3b30;
  --orange:   #ff9f0a;
  --blue:     #007aff;

  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", system-ui, sans-serif;
  color: var(--near-black);
  background: var(--white);
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 80px;
}

/* ── Hero ──────────────────────────────────────────────────────── */
.shftxan-hero {
  text-align: center;
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 52px;
}

.shftxan-hero-inner { max-width: 600px; margin: 0 auto; }

.shftxan-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--subtle);
  margin-bottom: 24px;
}

.shftxan-title {
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--black);
  margin: 0 0 12px;
}

.shftxan-subtitle {
  font-size: 18px;
  color: var(--subtle);
  margin: 0;
  font-weight: 400;
}

/* ── Main sections ─────────────────────────────────────────────── */
.shftxan-main {
  max-width: 840px;
  margin: 0 auto;
}

.shftxan-section {
  margin-bottom: 40px;
}

.shftxan-label-top {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--subtle);
  margin-bottom: 12px;
}

/* ── Date input ────────────────────────────────────────────────── */
.shftxan-date-input {
  width: 100%;
  max-width: 380px;
  height: 48px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 0 18px;
  font-size: 16px;
  font-family: inherit;
  color: var(--near-black);
  background: var(--white);
  outline: none;
  transition: border-color 0.2s;
}

.shftxan-date-input:focus {
  border-color: var(--black);
}

.shftxan-date-input::placeholder {
  color: var(--border);
}

/* ── Drop zone grid ────────────────────────────────────────────── */
.shftxan-drop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.shftxan-drop-zone {
  position: relative;
  border: 1.5px dashed var(--border);
  border-radius: 16px;
  padding: 28px 18px 24px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
  text-align: center;
  background: var(--white);
}

.shftxan-drop-zone:hover {
  border-color: var(--mid);
  background: var(--bg-off);
}

.shftxan-drop-zone.dragging {
  border-color: var(--black);
  background: #f0f0f0;
  transform: scale(1.02);
}

.shftxan-drop-zone.ready {
  border-color: var(--black);
  border-style: solid;
  background: var(--near-black);
  color: var(--white);
}

.shftxan-drop-zone.ready .shftxan-drop-sub,
.shftxan-drop-zone.ready .shftxan-drop-status {
  color: rgba(255,255,255,0.6);
}

.shftxan-drop-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  pointer-events: none;
}

.shftxan-drop-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-off);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 6px;
  transition: background 0.2s;
}

.shftxan-drop-zone.ready .shftxan-drop-icon {
  background: rgba(255,255,255,0.15);
}

.shftxan-drop-icon svg {
  color: var(--mid);
}

.shftxan-drop-zone.ready .shftxan-drop-icon svg {
  color: var(--white);
}

.shftxan-drop-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--near-black);
  line-height: 1.3;
}

.shftxan-drop-zone.ready .shftxan-drop-title {
  color: var(--white);
}

.shftxan-drop-sub {
  font-size: 11px;
  color: var(--subtle);
  letter-spacing: 0.02em;
}

.shftxan-drop-status {
  font-size: 11px;
  color: var(--border);
  margin-top: 2px;
}

.shftxan-file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

/* ── Submit button ─────────────────────────────────────────────── */
.shftxan-submit-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.shftxan-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 50px;
  padding: 0 28px;
  background: var(--black);
  color: var(--white);
  border: none;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  letter-spacing: -0.01em;
  transition: background 0.2s, opacity 0.2s, transform 0.1s;
}

.shftxan-btn:hover:not(:disabled) {
  background: var(--dark);
  transform: translateY(-1px);
}

.shftxan-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none;
}

.shftxan-btn-outline {
  background: transparent;
  color: var(--black);
  border: 1.5px solid var(--black);
}

.shftxan-btn-outline:hover:not(:disabled) {
  background: var(--near-black);
  color: var(--white);
}

.shftxan-btn-download {
  background: var(--black);
  text-decoration: none;
}

.shftxan-hint {
  font-size: 13px;
  color: var(--border);
  margin: 0;
}

/* ── Progress ──────────────────────────────────────────────────── */
.shftxan-progress-wrap {
  margin-top: 32px;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-off);
}

.shftxan-progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 14px;
}

.shftxan-progress-fill {
  height: 100%;
  background: var(--black);
  border-radius: 2px;
  transition: width 0.4s ease;
  width: 0%;
}

.shftxan-status-msg {
  font-size: 14px;
  color: var(--mid);
  margin: 0;
  text-align: center;
}

/* ── Result ────────────────────────────────────────────────────── */
.shftxan-result {
  margin-top: 32px;
  padding: 36px;
  border: 1.5px solid var(--black);
  border-radius: 20px;
  text-align: center;
  background: var(--white);
}

.shftxan-result-icon {
  width: 52px;
  height: 52px;
  background: var(--black);
  color: var(--white);
  border-radius: 50%;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.shftxan-result-title {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 8px;
}

.shftxan-result-meta {
  font-size: 14px;
  color: var(--subtle);
  margin: 0 0 24px;
}

.shftxan-result .shftxan-btn + .shftxan-btn {
  margin-left: 12px;
}

/* ── Error ─────────────────────────────────────────────────────── */
.shftxan-error {
  margin-top: 24px;
  padding: 20px 24px;
  border: 1.5px solid var(--red);
  border-radius: 12px;
  background: #fff5f5;
}

.shftxan-error p {
  color: var(--red);
  font-size: 14px;
  margin: 0 0 12px;
}

/* ── History ───────────────────────────────────────────────────── */
.shftxan-history-section {
  max-width: 840px;
  margin: 64px auto 0;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.shftxan-history-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
}

.shftxan-history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.shftxan-history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--white);
  transition: border-color 0.15s;
}

.shftxan-history-item:hover {
  border-color: var(--mid);
}

.shftxan-history-left h4 {
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 3px;
  color: var(--near-black);
}

.shftxan-history-left p {
  font-size: 12px;
  color: var(--subtle);
  margin: 0;
}

.shftxan-history-item a {
  font-size: 13px;
  font-weight: 600;
  color: var(--black);
  text-decoration: none;
  padding: 8px 16px;
  border: 1.5px solid var(--black);
  border-radius: 50px;
  transition: background 0.15s, color 0.15s;
}

.shftxan-history-item a:hover {
  background: var(--black);
  color: var(--white);
}

.shftxan-loading-hist {
  color: var(--subtle);
  font-size: 14px;
  text-align: center;
  padding: 20px;
}

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .shftxan-drop-grid {
    grid-template-columns: 1fr 1fr;
  }
  .shftxan-submit-wrap {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ── Column Selector ───────────────────────────────────────────── */
.shftxan-toggle-cols {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  color: var(--mid);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.shftxan-toggle-cols:hover { border-color: var(--mid); color: var(--near-black); }
.shftxan-chevron { transition: transform 0.2s; }

.shftxan-col-panel {
  margin-top: 16px;
  padding: 20px;
  border: 1.5px solid var(--border);
  border-radius: 14px;
  background: var(--bg-off);
}

.shftxan-col-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}
.shftxan-col-action-btn {
  font-size: 12px;
  font-weight: 600;
  font-family: inherit;
  padding: 5px 14px;
  border-radius: 50px;
  border: 1.5px solid var(--border);
  background: var(--white);
  cursor: pointer;
  color: var(--mid);
  transition: border-color 0.15s, color 0.15s;
}
.shftxan-col-action-btn:hover { border-color: var(--black); color: var(--black); }

.shftxan-col-groups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.shftxan-col-group {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
}

.shftxan-col-group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 12px;
}

.shftxan-col-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.shftxan-col-checkboxes {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.shftxan-col-checkboxes label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--near-black);
  cursor: pointer;
}

.shftxan-col-checkboxes input[type="checkbox"] {
  width: 15px;
  height: 15px;
  accent-color: var(--black);
  cursor: pointer;
  flex-shrink: 0;
}

/* ── 2-step progress ───────────────────────────────────────────── */
.shftxan-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 20px;
}
.shftxan-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.shftxan-step-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--white);
  transition: all 0.3s;
}
.shftxan-step-dot.active {
  border-color: var(--black);
  background: var(--black);
}
.shftxan-step-dot.done {
  border-color: var(--black);
  background: var(--black);
}
.shftxan-step-line {
  width: 80px;
  height: 2px;
  background: var(--border);
  margin: 0 8px;
  margin-bottom: 22px;
}
.shftxan-step-label {
  font-size: 11px;
  color: var(--subtle);
  font-weight: 500;
}

/* ── Spinner ───────────────────────────────────────────────────── */
.shftxan-spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid var(--border);
  border-top-color: var(--black);
  border-radius: 50%;
  animation: shftxan-spin 0.7s linear infinite;
  margin-right: 6px;
  vertical-align: middle;
}
@keyframes shftxan-spin { to { transform: rotate(360deg); } }

/* ── Partial result (excel ready, AI running) ──────────────────── */
.shftxan-result-partial {
  border-color: var(--border);
  padding: 24px 28px;
  text-align: left;
}
.shftxan-result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.shftxan-result-partial .shftxan-result-title {
  font-size: 18px;
  margin-bottom: 4px;
}
.shftxan-ai-status {
  font-size: 13px;
  color: var(--subtle);
  margin: 6px 0 0;
}
.shftxan-ai-error {
  color: var(--red);
  font-size: 13px;
}

/* ── Final result btns ─────────────────────────────────────────── */
.shftxan-result-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 20px;
}

/* ── Column Selector ───────────────────────────────────────────── */
.shftxan-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  color: var(--mid);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.shftxan-toggle-btn:hover { border-color: var(--black); color: var(--black); }
.shftxan-chevron { transition: transform 0.2s; flex-shrink: 0; }

#shftxan-col-panel {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}

.shftxan-col-actions {
  display: flex;
  gap: 10px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-off);
}
.shftxan-col-actions button {
  font-size: 12px;
  font-weight: 600;
  font-family: inherit;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  cursor: pointer;
  color: var(--mid);
  transition: background 0.15s, color 0.15s;
}
.shftxan-col-actions button:hover { background: var(--black); color: var(--white); border-color: var(--black); }

.shftxan-col-group {
  border-bottom: 1px solid var(--border);
  padding: 14px 18px;
}
.shftxan-col-group:last-child { border-bottom: none; }

.shftxan-col-group-header { margin-bottom: 10px; }
.shftxan-group-check {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--near-black);
}
.shftxan-group-check input[type="checkbox"] { width: 15px; height: 15px; cursor: pointer; accent-color: var(--black); }

.shftxan-col-checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-left: 4px;
}
.shftxan-col-check {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--mid);
  cursor: pointer;
  white-space: nowrap;
}
.shftxan-col-check input[type="checkbox"] { width: 14px; height: 14px; cursor: pointer; accent-color: var(--black); }

/* ── Two-step progress ─────────────────────────────────────────── */
.shftxan-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 20px;
}
.shftxan-step {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--border);
}
.shftxan-step.active { color: var(--black); }
.shftxan-step.done   { color: var(--subtle); }
.shftxan-step-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
  transition: background 0.3s;
}
.shftxan-step.active .shftxan-step-dot { background: var(--black); box-shadow: 0 0 0 3px rgba(0,0,0,0.12); }
.shftxan-step.done  .shftxan-step-dot  { background: var(--subtle); }
.shftxan-step-line  { width: 48px; height: 1px; background: var(--border); margin: 0 10px; }

/* ── Excel-ready intermediate state ───────────────────────────── */
.shftxan-excel-ready {
  margin-top: 24px;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}
.shftxan-result-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.shftxan-result-row .shftxan-result-title { font-size: 16px; font-weight: 700; margin: 0 0 2px; }
.shftxan-result-row .shftxan-result-meta  { font-size: 13px; color: var(--subtle); margin: 0; }
.shftxan-result-row .shftxan-btn { margin-left: auto; }
.shftxan-ai-row {
  padding: 14px 24px;
  background: var(--bg-off);
  font-size: 13px;
  color: var(--mid);
}
.shftxan-ai-error { color: var(--red); font-weight: 500; }

/* ── Spinner ───────────────────────────────────────────────────── */
.shftxan-spinner {
  display: inline-block;
  width: 13px; height: 13px;
  border: 2px solid var(--border);
  border-top-color: var(--black);
  border-radius: 50%;
  animation: shftxan-spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}
@keyframes shftxan-spin { to { transform: rotate(360deg); } }

/* Final result button row */
.shftxan-result-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.shftxan-result-icon-wrap {
  width: 52px; height: 52px;
  background: var(--black); color: var(--white);
  border-radius: 50%; font-size: 22px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}

.shftxan-ai-warn  { color: var(--orange) !important; }
.shftxan-ai-error { color: var(--red)    !important; font-weight: 500; }