/* ============================================================================
 * Expense Deductibility Checker — styles
 * IRAS-inspired palette: deep blue primary, generous whitespace, soft cards.
 * ========================================================================= */

:root {
  color-scheme: light;

  --blue-900: #0F2A52;
  --blue-800: #163A6E;
  --blue-700: #1F4C8E;
  --blue-600: #2B5DAA;
  --blue-50:  #EFF4FB;

  --ink-900: #0F172A;
  --ink-700: #334155;
  --ink-500: #64748B;
  --ink-300: #CBD5E1;
  --ink-200: #E2E8F0;
  --ink-100: #F1F5F9;

  --bg:      #F7F9FB;
  --surface: #FFFFFF;

  --green-bg: #DCFCE7;
  --green-fg: #166534;
  --red-bg:   #FEE2E2;
  --red-fg:   #991B1B;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 28px rgba(15, 23, 42, 0.08), 0 4px 10px rgba(15, 23, 42, 0.04);

  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;

  --focus-ring: 0 0 0 3px rgba(31, 76, 142, 0.25);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI Variable', 'Segoe UI',
    Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-900);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --- Top accent bar --- */

.accent-bar {
  height: 4px;
  background: linear-gradient(90deg, var(--blue-700) 0%, var(--blue-600) 60%, var(--blue-900) 100%);
}

/* --- Layout --- */

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 16px 56px;
}

/* --- Header --- */

.page-header {
  margin-bottom: 24px;
}

.logo {
  display: block;
  width: auto;
  height: 80px;
  margin: 0 0 20px;
  user-select: none;
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-700);
}

.page-header h1 {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--ink-900);
}

.action-hint {
  margin: 0 0 10px;
  color: var(--ink-500);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* --- Info box (collapsible) --- */

.info-box {
  margin-bottom: 20px;
  background: var(--blue-50);
  /* Per-side borders, no shorthand: Edge has rendered the top/right/bottom
     sides as invisible when a `border` shorthand was followed by a
     `border-left` override on a rounded box. Setting each side explicitly
     (and using a solid color rather than rgba) sidesteps the quirk. */
  border-top: 1px solid #C5D4E8;
  border-right: 1px solid #C5D4E8;
  border-bottom: 1px solid #C5D4E8;
  border-left: 4px solid var(--blue-700);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
  color: var(--ink-700);
  line-height: 1.6;
}

.info-box > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  margin: 0;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--blue-800);
  letter-spacing: 0.01em;
  list-style: none;
  user-select: none;
}

.info-box > summary::-webkit-details-marker { display: none; }
.info-box > summary::marker { display: none; }

.info-box > summary:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-lg);
}

.info-box .chevron {
  color: var(--blue-700);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.info-box[open] .chevron { transform: rotate(180deg); }

.info-box-body {
  padding: 0 20px 16px;
  border-top: 1px solid #C5D4E8;
  margin-top: 0;
  padding-top: 12px;
}

.info-box-body p {
  margin: 0 0 10px;
}

.info-box-body ul {
  margin: 0;
  padding-left: 20px;
}

.info-box-body ul li {
  margin-bottom: 6px;
}

.info-box-body ul li:last-child {
  margin-bottom: 0;
}

/* --- Search --- */

.search-section {
  position: relative;
  margin-bottom: 16px;
}

.search-wrapper {
  position: relative;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--ink-500);
  pointer-events: none;
}

#search {
  width: 100%;
  min-height: 52px;
  padding: 10px 44px 10px 44px;
  font-size: 16px;
  font-family: inherit;
  color: var(--ink-900);
  background: var(--surface);
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  -webkit-appearance: none;
  appearance: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#search::placeholder { color: var(--ink-500); }

/* Hide browser-native search controls; we render our own clear button. */
#search::-webkit-search-cancel-button,
#search::-webkit-search-decoration,
#search::-webkit-search-results-button,
#search::-webkit-search-results-decoration {
  -webkit-appearance: none;
  appearance: none;
  display: none;
}

#search::-ms-clear,
#search::-ms-reveal {
  display: none;
  width: 0;
  height: 0;
}

#search:focus {
  outline: none;
  border-color: var(--blue-700);
  box-shadow: var(--focus-ring);
}

#search:disabled {
  background-color: var(--ink-100);
  color: var(--ink-500);
  cursor: not-allowed;
}

.clear-search {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--ink-500);
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.15s ease, color 0.15s ease;
}

.clear-search svg { width: 14px; height: 14px; }

.clear-search:hover {
  background: var(--ink-100);
  color: var(--ink-900);
}

.clear-search:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* --- Search results dropdown --- */

.search-results {
  list-style: none;
  margin: 8px 0 0;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  max-height: 360px;
  overflow-y: auto;
}

.search-results li {
  padding: 12px 14px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.1s ease;
}

.search-results li:hover,
.search-results li.active {
  background: var(--blue-50);
}

.search-results .result-name {
  display: block;
  font-weight: 500;
  color: var(--ink-900);
  line-height: 1.4;
}

.search-results .result-empty {
  padding: 16px;
  color: var(--ink-500);
  font-style: italic;
  text-align: center;
  cursor: default;
}

.search-results .result-empty:hover { background: transparent; }

.search-results mark {
  background: rgba(31, 76, 142, 0.16);
  padding: 0 2px;
  border-radius: 3px;
  color: inherit;
  font-weight: 600;
}

/* --- Browse (collapsible) --- */

.browse-section {
  margin-bottom: 16px;
  background: var(--surface);
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s ease;
}

.browse-section[open] { box-shadow: var(--shadow-md); }

.browse-section summary {
  padding: 16px 18px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--blue-700);
  list-style: none;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.browse-section summary::-webkit-details-marker { display: none; }
.browse-section summary::marker { display: none; }

.browse-section .chevron {
  width: 18px;
  height: 18px;
  color: var(--blue-700);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.browse-section[open] .chevron { transform: rotate(180deg); }

.browse-section summary:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-lg);
}

.browse-section .controls {
  padding: 4px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: 1px solid var(--ink-200);
  margin-top: 4px;
  padding-top: 18px;
}

/* --- Form fields --- */

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field label {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--ink-700);
}

.field select {
  width: 100%;
  min-height: 48px;
  padding: 10px 40px 10px 14px;
  font-size: 16px;
  font-family: inherit;
  color: var(--ink-900);
  background: var(--surface);
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 20 20'><path fill='none' stroke='%2364748B' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round' d='M6 8l4 4 4-4'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field select:focus {
  outline: none;
  border-color: var(--blue-700);
  box-shadow: var(--focus-ring);
}

.field select:disabled {
  background-color: var(--ink-100);
  color: var(--ink-500);
  cursor: not-allowed;
}

/* --- Result panel --- */

.result {
  background: var(--surface);
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  min-height: 140px;
  box-shadow: var(--shadow-md);
}

.empty-state .placeholder {
  margin: 0 0 14px;
  color: var(--ink-500);
}

.example-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.example-chips button {
  border: 1px solid var(--ink-200);
  background: var(--surface);
  color: var(--ink-700);
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-family: inherit;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
  line-height: 1.3;
}

.example-chips button:hover {
  background: var(--blue-50);
  border-color: var(--blue-700);
  color: var(--blue-900);
}

.example-chips button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Result content hierarchy */

.result .breadcrumb {
  margin: 0 0 6px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-700);
}

.result .expense-name {
  margin: 0 0 16px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-900);
  letter-spacing: -0.005em;
  line-height: 1.35;
}

/* Body text + lists */

.deductibility {
  margin: 0;
  color: var(--ink-700);
  font-size: 0.975rem;
  line-height: 1.65;
}

.deductibility p {
  margin: 0 0 14px;
}

.deductibility p:last-child { margin-bottom: 0; }

.deductibility ol {
  margin: 4px 0 14px;
  padding-left: 0;
  list-style: none;
  counter-reset: roman;
}

.deductibility ol li {
  position: relative;
  counter-increment: roman;
  padding-left: 36px;
  margin-bottom: 8px;
}

.deductibility ol li::before {
  content: "(" counter(roman, lower-roman) ")";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--blue-700);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  min-width: 32px;
  text-align: left;
}

.deductibility ol li:last-child { margin-bottom: 0; }

.deductibility ul {
  margin: 4px 0 14px;
  padding-left: 0;
  list-style: none;
}

.deductibility ul li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 8px;
}

.deductibility ul li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue-700);
}

.deductibility ul li:last-child { margin-bottom: 0; }

/* --- IRAS link --- */

.iras-link {
  margin-top: 20px;
  padding: 12px 16px;
  background: var(--blue-50);
  border-left: 4px solid var(--blue-700);
  border-radius: 0 6px 6px 0;
}

.iras-link a {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--blue-700);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.iras-link a svg {
  vertical-align: middle;
  margin-bottom: 2px;
}

.iras-link a:hover {
  color: var(--blue-900);
}

/* --- Actions --- */

.actions {
  margin-top: 14px;
  display: flex;
  justify-content: flex-end;
}

.reset-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--ink-200);
  color: var(--ink-700);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.reset-btn svg {
  width: 14px;
  height: 14px;
}

.reset-btn:hover {
  background: var(--blue-50);
  border-color: var(--blue-700);
  color: var(--blue-900);
}

.reset-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* --- Error --- */

.error {
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid #FBCFCF;
  background: #FFF5F5;
  color: var(--red-fg);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
}

/* --- Footer --- */

.site-footer {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--ink-200);
}

.disclaimer {
  margin: 0 0 8px;
  font-size: 0.8125rem;
  color: var(--ink-500);
  line-height: 1.55;
}

.last-updated {
  margin: 0;
  font-size: 0.75rem;
  color: var(--ink-500);
}

/* --- Others checklist --- */

.checklist-intro {
  margin: 0 0 16px;
  font-size: 0.9rem;
  color: var(--ink-500);
  line-height: 1.5;
}

.checklist {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.checklist-item {
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.checklist-item.answered-yes {
  background: var(--green-bg);
  border-color: #86efac;
}

.checklist-item.answered-no {
  background: var(--red-bg);
  border-color: #fca5a5;
}

.checklist-text {
  margin: 0 0 12px;
  font-size: 0.925rem;
  color: var(--ink-700);
  line-height: 1.55;
  transition: color 0.2s ease;
}

.checklist-item.answered-yes .checklist-text { color: var(--green-fg); }
.checklist-item.answered-no  .checklist-text { color: var(--red-fg); }

.checklist-btns {
  display: flex;
  gap: 8px;
}

.checklist-btn {
  padding: 5px 22px;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  border: 1.5px solid var(--ink-200);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink-500);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.checklist-btn:hover {
  border-color: var(--ink-300);
  color: var(--ink-700);
}

.checklist-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.checklist-btn-yes.active {
  background: var(--green-fg);
  border-color: var(--green-fg);
  color: #fff;
}

.checklist-btn-no.active {
  background: var(--red-fg);
  border-color: var(--red-fg);
  color: #fff;
}

/* Checklist result card */

.checklist-result {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
}

.checklist-result-yes {
  background: var(--green-bg);
  border-color: #86efac;
}

.checklist-result-no {
  background: var(--red-bg);
  border-color: #fca5a5;
}

.checklist-result-title {
  margin: 0 0 6px;
  font-weight: 700;
  font-size: 0.95rem;
}

.checklist-result-yes .checklist-result-title { color: var(--green-fg); }
.checklist-result-no  .checklist-result-title { color: var(--red-fg); }

.checklist-result-body {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.55;
}

.checklist-result-yes .checklist-result-body { color: var(--green-fg); }
.checklist-result-no  .checklist-result-body { color: var(--red-fg); }

/* --- Responsive --- */

@media (min-width: 640px) {
  .container {
    padding: 48px 24px 72px;
  }

  .page-header {
    margin-bottom: 28px;
  }

  .logo {
    height: 96px;
    margin-bottom: 24px;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .action-hint {
    font-size: 1rem;
  }

  .result {
    padding: 28px 30px;
  }

  .result .expense-name {
    font-size: 1.4rem;
  }
}

/* --- Reduced motion --- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}