/* ═══════════════════════════════════════════════════════════════════════
   Tax Filing Assistant – Stylesheet
   ═══════════════════════════════════════════════════════════════════════ */

/* ── Reset & Base ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --clr-bg:       #f4f6fb;
  --clr-surface:  #ffffff;
  --clr-primary:  #2563eb;
  --clr-primary-h:#1d4ed8;
  --clr-accent:   #10b981;
  --clr-danger:   #ef4444;
  --clr-text:     #1e293b;
  --clr-muted:    #64748b;
  --clr-border:   #e2e8f0;
  --clr-input-bg: #f8fafc;
  --radius:       8px;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.06);
  --shadow-md:    0 4px 12px rgba(0,0,0,.08);
  --shadow-lg:    0 8px 30px rgba(0,0,0,.10);
  --transition:   .2s ease;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Layout ────────────────────────────────────────────────────────── */
.app-header {
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}
.app-header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-primary);
}
.app-header .subtitle {
  font-size: .85rem;
  color: var(--clr-muted);
}

.app-container {
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

/* ── Stepper ────────────────────────────────────────────────────────── */
.stepper {
  display: flex;
  justify-content: center;
  gap: .5rem;
  margin-bottom: 2rem;
}
.stepper-step {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: .5rem 1rem;
  font-size: .85rem;
  font-weight: 600;
  color: var(--clr-muted);
  border-radius: 2rem;
  background: var(--clr-surface);
  border: 2px solid var(--clr-border);
  transition: var(--transition);
  cursor: default;
}
.stepper-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--clr-border);
  color: var(--clr-muted);
  font-size: .75rem;
  font-weight: 700;
}
.stepper-step.active {
  color: var(--clr-primary);
  border-color: var(--clr-primary);
  background: #eff6ff;
}
.stepper-step.active .step-num {
  background: var(--clr-primary);
  color: #fff;
}
.stepper-step.completed {
  color: var(--clr-accent);
  border-color: var(--clr-accent);
  background: #ecfdf5;
}
.stepper-step.completed .step-num {
  background: var(--clr-accent);
  color: #fff;
}

/* ── Cards ──────────────────────────────────────────────────────────── */
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.card h2 {
  font-size: 1.15rem;
  margin-bottom: 1.25rem;
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--clr-border);
}
.card h3 {
  font-size: 1rem;
  margin-bottom: .75rem;
  color: var(--clr-text);
}

/* ── Form Inputs ────────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 1rem;
}
.form-group label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--clr-muted);
  margin-bottom: .35rem;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: .6rem .75rem;
  font-size: .95rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-input-bg);
  color: var(--clr-text);
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

/* ── Searchable Dropdown ───────────────────────────────────────────── */
.search-select {
  position: relative;
}
.search-select input {
  width: 100%;
  padding: .6rem .75rem;
  padding-right: 2rem;
  font-size: .95rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-input-bg);
  color: var(--clr-text);
  cursor: pointer;
}
.search-select input:focus {
  outline: none;
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.search-select .arrow {
  position: absolute;
  right: .75rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--clr-muted);
  font-size: .7rem;
}
.search-select .dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  max-height: 220px;
  overflow-y: auto;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  z-index: 50;
}
.search-select.open .dropdown {
  display: block;
}
.search-select .dropdown-item {
  padding: .5rem .75rem;
  font-size: .9rem;
  cursor: pointer;
  transition: background var(--transition);
}
.search-select .dropdown-item:hover,
.search-select .dropdown-item.highlighted {
  background: #eff6ff;
  color: var(--clr-primary);
}
.search-select .dropdown-item.selected {
  background: var(--clr-primary);
  color: #fff;
}
.search-select .no-results {
  padding: .5rem .75rem;
  font-size: .85rem;
  color: var(--clr-muted);
  font-style: italic;
}

/* ── Dynamic Rows (Income / Business) ──────────────────────────────── */
.dynamic-section { margin-top: 1rem; }
.dynamic-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: .75rem;
  align-items: end;
  padding: .75rem;
  background: var(--clr-input-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  margin-bottom: .5rem;
}
.dynamic-row.business-row {
  grid-template-columns: 1fr 1fr 1fr auto;
}
.dynamic-row .form-group { margin-bottom: 0; }
.btn-remove {
  width: 32px; height: 32px;
  border: none;
  background: var(--clr-danger);
  color: #fff;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
}
.btn-remove:hover { opacity: .8; }

/* ── Buttons ────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.4rem;
  font-size: .9rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary {
  background: var(--clr-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--clr-primary-h); }
.btn-secondary {
  background: var(--clr-surface);
  color: var(--clr-text);
  border: 1px solid var(--clr-border);
}
.btn-secondary:hover { background: var(--clr-bg); }
.btn-success {
  background: var(--clr-accent);
  color: #fff;
}
.btn-success:hover { opacity: .9; }
.btn-add {
  background: none;
  color: var(--clr-primary);
  border: 1px dashed var(--clr-primary);
  padding: .5rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: .85rem;
  font-weight: 600;
  transition: var(--transition);
  margin-top: .5rem;
}
.btn-add:hover { background: #eff6ff; }

.btn-group {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
}

/* ── Step visibility ────────────────────────────────────────────────── */
.step-panel { display: none; }
.step-panel.active { display: block; }

/* ── Summary Panel ──────────────────────────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.summary-item {
  padding: 1rem;
  background: var(--clr-input-bg);
  border-radius: var(--radius);
  border: 1px solid var(--clr-border);
}
.summary-item .label {
  font-size: .8rem;
  color: var(--clr-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
}
.summary-item .value {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: .25rem;
}
.summary-item .value.positive { color: var(--clr-accent); }
.summary-item .value.negative { color: var(--clr-danger); }

/* ── Forms Results ──────────────────────────────────────────────────── */
.form-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.form-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--clr-input-bg);
  border-bottom: 1px solid var(--clr-border);
  cursor: pointer;
  user-select: none;
}
.form-card-header:hover {
  background: #eff6ff;
}
.form-card-header h3 {
  margin: 0;
  font-size: 1rem;
}
.form-card-header .form-subtitle {
  font-size: .8rem;
  color: var(--clr-muted);
  margin-top: .15rem;
}
.form-card-header .toggle-icon {
  font-size: 1.2rem;
  color: var(--clr-muted);
  transition: transform var(--transition);
}
.form-card.expanded .toggle-icon {
  transform: rotate(180deg);
}
.form-card-body {
  display: none;
  padding: 1.25rem;
}
.form-card.expanded .form-card-body {
  display: block;
}
.form-links {
  display: flex;
  gap: .75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.form-links a {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .4rem .8rem;
  border-radius: var(--radius);
  font-size: .8rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--clr-border);
  color: var(--clr-primary);
  transition: var(--transition);
}
.form-links a:hover {
  background: #eff6ff;
  border-color: var(--clr-primary);
}
.form-explanation {
  background: #fefce8;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  padding: .75rem 1rem;
  margin-bottom: 1rem;
  font-size: .88rem;
  line-height: 1.5;
  color: #854d0e;
}
.form-explanation::before {
  content: "ℹ️ ";
}
.form-fields-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: .75rem;
}
.form-field {
  display: flex;
  flex-direction: column;
}
.form-field label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--clr-muted);
  margin-bottom: .25rem;
}
.form-field input {
  padding: .5rem .65rem;
  font-size: .9rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-input-bg);
  color: var(--clr-text);
}
.form-field input:focus {
  outline: none;
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

/* ── Loading ────────────────────────────────────────────────────────── */
.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,.8);
  z-index: 200;
  align-items: center;
  justify-content: center;
}
.loading-overlay.active {
  display: flex;
}
.spinner {
  width: 40px; height: 40px;
  border: 4px solid var(--clr-border);
  border-top-color: var(--clr-primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── NAICS Picker (inline) ──────────────────────────────────────────── */
.naics-picker {
  display: flex;
  align-items: center;
  gap: .5rem;
}
.naics-display {
  flex: 1;
  padding: .5rem .65rem;
  font-size: .85rem;
  color: var(--clr-muted);
  background: var(--clr-input-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}
.naics-display.has-value {
  color: var(--clr-text);
  font-weight: 600;
}
.btn-browse {
  padding: .45rem .85rem;
  font-size: .8rem;
  font-weight: 600;
  background: var(--clr-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition);
}
.btn-browse:hover { background: var(--clr-primary-h); }

/* ── NAICS Modal ────────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 300;
  align-items: center;
  justify-content: center;
}
.modal-overlay.active {
  display: flex;
}
.modal {
  background: var(--clr-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 560px;
  max-width: 92vw;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--clr-border);
}
.modal-header h2 {
  font-size: 1.05rem;
  margin: 0;
  border: none;
  padding: 0;
}
.naics-close {
  width: 32px; height: 32px;
  font-size: 1.2rem;
  background: none;
  border: 1px solid var(--clr-border);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-muted);
  transition: var(--transition);
}
.naics-close:hover {
  background: var(--clr-bg);
  color: var(--clr-danger);
}
.naics-search {
  width: calc(100% - 2.5rem);
  margin: .75rem 1.25rem;
  padding: .6rem .75rem;
  font-size: .95rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  background: var(--clr-input-bg);
  color: var(--clr-text);
  outline: none;
}
.naics-search:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.naics-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 1.25rem 1rem;
}
.naics-cat-header {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--clr-muted);
  padding: .75rem 0 .35rem;
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: .25rem;
}
.naics-suggested-header {
  color: #d97706;
  border-bottom-color: #fde68a;
}
.naics-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .55rem .5rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition);
}
.naics-item:hover {
  background: #eff6ff;
}
.naics-code-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 60px;
  padding: .2rem .5rem;
  font-size: .78rem;
  font-weight: 700;
  font-family: monospace;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: 4px;
  color: var(--clr-primary);
  flex-shrink: 0;
}
.naics-label {
  font-size: .88rem;
  color: var(--clr-text);
}
.naics-label mark {
  background: #fef08a;
  color: inherit;
  border-radius: 2px;
  padding: 0 1px;
}
.naics-empty {
  padding: 1.5rem;
  text-align: center;
  color: var(--clr-muted);
  font-style: italic;
  font-size: .9rem;
}

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
  .dynamic-row { grid-template-columns: 1fr; }
  .dynamic-row.business-row { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: 1fr; }
  .stepper { flex-wrap: wrap; }
  .app-container { padding: 0 1rem; }
  .modal { width: 100vw; max-width: 100vw; max-height: 100vh; border-radius: 0; }
}