:root {
  --navy-900: #0f2038;
  --blue-700: #163f73;
  --blue-600: #1e5faa;
  --blue-500: #2d5aa0;
  --blue-400: #4a90b8;
  --green-600: #557f32;
  --green-500: #6a9c3f;
  --green-100: #eaf3de;
  --orange-500: #f08c1f;
  --orange-600: #d97815;
  --ink: #14213a;
  --ink-soft: #56677c;
  --ink-faint: #8593a3;
  --bg: #f4f7fb;
  --card-bg: #ffffff;
  --border: #dde5ee;
  --regime1: #1c8a4c;
  --regime1-bg: #e6f6ec;
  --regime2: #b8860a;
  --regime2-bg: #fbf3df;
  --regime3: #c4392b;
  --regime3-bg: #fbe9e7;
  --radius: 16px;
  --bar-gradient: linear-gradient(135deg, var(--blue-500) 0%, var(--blue-400) 100%);
  --shadow: 0 1px 2px rgba(15, 32, 56, 0.05), 0 8px 24px rgba(15, 32, 56, 0.08);
  --page-max: 1360px;
  font-size: 16px;
}

* { box-sizing: border-box; }

html {
  height: 100%;
}
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
}

/* Any <main> page section grows to fill leftover height, so the footer
   always sits at the bottom of the viewport even on short pages. */
body > main {
  flex: 1 0 auto;
  width: 100%;
}
.site-footer { flex-shrink: 0; }

a { color: var(--blue-600); }

/* ---- toolbar (slim, single row) ---- */
.toolbar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.toolbar-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.toolbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.toolbar-brand .logo-mark { width: 44px; height: 44px; flex-shrink: 0; display: block; object-fit: contain; }
.toolbar-brand-text { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.toolbar-brand-text .name { font-size: 1.3rem; font-weight: 800; }
.toolbar-brand-text .name-en, .footer-brand .name-en { color: var(--ink); }
.toolbar-brand-text .name-cage, .footer-brand .name-cage {
  background: linear-gradient(90deg, var(--blue-600) 0%, var(--green-500) 55%, var(--orange-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.toolbar-brand-text .tag {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.toolbar-brand-text .tag-divider {
  display: block;
  width: 46px;
  height: 2px;
  margin: 5px 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue-600) 0%, var(--green-500) 50%, var(--orange-500) 100%);
}
.toolbar-brand-text .subtitle {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.toolbar-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-shrink: 0;
}
.toolbar-link {
  display: flex;
  align-items: center;
  gap: 7px;
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
}
.toolbar-link img { height: 18px; width: auto; display: block; }
.toolbar-link:hover { color: var(--blue-600); }
@media (max-width: 620px) {
  .toolbar-brand-text .tag,
  .toolbar-brand-text .tag-divider,
  .toolbar-brand-text .subtitle { display: none; }
  .toolbar-link .label { display: none; }
}

/* ---- layout: sidebar + main ---- */
.wrap {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 22px 16px 40px;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  align-items: start;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
}

.sidebar { position: relative; }
@media (min-width: 901px) {
  .sidebar { position: sticky; top: 72px; }
}

.main-panel { min-width: 0; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 16px;
  overflow: hidden;
}

.card-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.card-header h2 {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--blue-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-body { padding: 16px 18px; }

.input-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
}
.input-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  text-align: left;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  font-family: inherit;
  min-height: 64px;
  transition: border-color .15s ease, background-color .15s ease;
}
@media (hover: hover) {
  .input-option:not(.active):hover { border-color: var(--blue-400); }
}
.input-option.active {
  border-color: var(--blue-500);
  background: #eaf1fb;
}
.input-option-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 800;
  font-size: 0.72rem;
  border: 1px solid transparent;
}
.input-option.io-upload .input-option-icon { background: #e3edfb; color: var(--blue-600); border-color: #c7dbf5; }
.input-option.io-fetch .input-option-icon { background: var(--green-100); color: var(--green-600); border-color: #cfe3b8; }
.input-option.io-example .input-option-icon { background: #fdecd9; color: var(--orange-600); border-color: #f6d3a4; }
.input-option-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; padding-top: 1px; }
.input-option-title { font-size: 0.92rem; font-weight: 700; color: var(--ink); }
.input-option-desc { font-size: 0.78rem; color: var(--ink-soft); line-height: 1.4; }

.input-panels {
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-top: 2px;
}

.tab-panel.hidden { display: none; }

.dropzone {
  display: block;
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 22px 14px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
  background: #fafcff;
}
.dropzone:active,
.dropzone.dragover {
  border-color: var(--blue-500);
  background: #eaf1fb;
}
.dropzone-content svg { color: var(--blue-500); margin-bottom: 8px; }
.dropzone-content p {
  margin: 4px 0;
  font-size: 0.86rem;
  color: var(--ink-soft);
}
.file-name {
  font-weight: 700;
  color: var(--blue-600) !important;
  word-break: break-all;
}

.example-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.example-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  text-decoration: none;
  color: inherit;
  width: 100%;
  transition: border-color .15s ease, background-color .15s ease;
}
@media (hover: hover) {
  .example-item:hover { border-color: var(--blue-400); background: #fafcff; }
}
.example-meta { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.example-name { font-size: 0.86rem; font-weight: 700; color: var(--ink); }
.example-pdb { font-size: 0.74rem; color: var(--ink-faint); font-weight: 600; }
.example-regime-chip {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
}
.example-regime-chip.regime-1 { background: var(--regime1-bg); color: var(--regime1); }
.example-regime-chip.regime-2 { background: var(--regime2-bg); color: var(--regime2); }
.example-regime-chip.regime-3 { background: var(--regime3-bg); color: var(--regime3); }

.field-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.text-input {
  width: 100%;
  padding: 11px 12px;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  min-height: 42px;
}
.text-input:focus {
  outline: none;
  border-color: var(--blue-500);
  box-shadow: 0 0 0 3px rgba(45, 90, 160, 0.14);
}
.hint {
  font-size: 0.76rem;
  color: var(--ink-soft);
  margin: 8px 0 0;
  line-height: 1.4;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 420px) {
  .field-grid { grid-template-columns: 1fr; }
}

.advanced {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}
.advanced summary {
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--blue-600);
  list-style: none;
  padding: 8px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.advanced summary::-webkit-details-marker { display: none; }
.advanced summary::after {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform .15s ease;
  margin-left: 8px;
  flex-shrink: 0;
}
.advanced[open] summary::after { transform: rotate(-135deg); }
.advanced-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 10px 0 4px;
}
@media (max-width: 420px) {
  .advanced-grid { grid-template-columns: 1fr; }
}

.btn-primary {
  width: 100%;
  padding: 14px;
  font-family: inherit;
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
  background: var(--blue-600);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 6px 16px rgba(30, 95, 170, 0.32);
  transition: background-color .15s ease, box-shadow .15s ease, transform .1s ease;
}
@media (hover: hover) {
  .btn-primary:hover:not(:disabled) { background: var(--blue-700); box-shadow: 0 8px 20px rgba(30, 95, 170, 0.4); }
}
.btn-primary:active:not(:disabled) { background: var(--blue-700); transform: translateY(1px); }
.btn-primary:disabled { opacity: 0.55; box-shadow: none; cursor: default; }
.btn-primary:focus-visible, .btn-secondary:focus-visible, .input-option:focus-visible, .example-item:focus-visible {
  outline: 2px solid var(--blue-500);
  outline-offset: 2px;
}

.info-checklist {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.info-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  font-size: 0.8rem;
  color: var(--ink-soft);
  line-height: 1.4;
}
.info-checklist svg { flex-shrink: 0; margin-top: 1px; color: var(--ink-faint); }
.help-hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: 14px 2px 0;
}
.help-hint a { font-weight: 700; }

.btn-secondary {
  flex: 1;
  padding: 12px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--blue-600);
  background: #eaf1fb;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  min-height: 44px;
  transition: background-color .15s ease;
}
@media (hover: hover) {
  .btn-secondary:hover { background: #dce9fa; }
  .feature-card:hover { border-color: var(--blue-400); box-shadow: 0 4px 14px rgba(15, 32, 56, 0.06); }
}

.error-msg {
  margin: 10px 0 0;
  padding: 10px 12px;
  background: var(--regime3-bg);
  color: var(--regime3);
  border-radius: 10px;
  font-size: 0.86rem;
}
.hidden { display: none !important; }

/* ---- welcome (main panel default state) ---- */
.welcome h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin: 4px 0 16px;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
.grad-word {
  background: linear-gradient(90deg, var(--blue-600) 0%, var(--green-500) 55%, var(--orange-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.welcome .desc {
  font-size: 1.1rem;
  color: var(--ink-soft);
  line-height: 1.6;
  max-width: 680px;
  margin: 0 0 16px;
}
.hero-quickstart {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0 0 28px;
  line-height: 1.6;
}
.hero-quickstart a { font-weight: 700; }
.hero-quickstart .mini-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  flex-shrink: 0;
  font-weight: 800;
  font-size: 0.56rem;
}
.hero-quickstart .mini-icon.blue { background: #e3edfb; color: var(--blue-600); }
.hero-quickstart .mini-icon.green { background: var(--green-100); color: var(--green-600); }
.hero-quickstart .mini-icon.orange { background: #fdecd9; color: var(--orange-600); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 380px) {
  .feature-grid { grid-template-columns: 1fr; }
}
.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 14px;
  text-align: center;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.feature-card .icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
}
.feature-card .icon img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
}
.feature-card .title {
  display: block;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}
.feature-card.f1 .title { color: var(--blue-600); }
.feature-card.f2 .title { color: var(--green-600); }
.feature-card.f3 .title { color: var(--orange-600); }
.feature-card.f4 .title { color: var(--navy-900); }
.feature-card .desc {
  display: block;
  font-size: 0.87rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

.info-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 780px) {
  .info-columns { grid-template-columns: 1fr; }
}

.includes-card {
  background: #eaf1fb;
  border: 1px solid #d7e4f7;
  border-radius: 14px;
  padding: 20px;
}
.includes-card > .title { font-size: 1rem; font-weight: 700; color: var(--ink); margin: 0 0 14px; }
.includes-card-body {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.includes-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-width: 200px;
}
.includes-list li { display: flex; align-items: center; gap: 8px; font-size: 0.86rem; color: var(--ink); }
.includes-list svg { flex-shrink: 0; color: var(--blue-600); }

.report-preview {
  width: 130px;
  flex-shrink: 0;
  display: block;
  object-fit: contain;
}

.evidence-card {
  background: var(--green-100);
  border: 1px solid #d3e6bd;
  border-radius: 14px;
  padding: 20px;
  display: flex;
  gap: 14px;
  text-decoration: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
@media (hover: hover) {
  .evidence-card:hover { border-color: var(--green-500); box-shadow: 0 4px 14px rgba(15, 32, 56, 0.08); }
}
.evidence-card .icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.evidence-card .icon img { width: 100%; height: 100%; display: block; object-fit: contain; }
.evidence-card .content { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.evidence-card .title { font-size: 1rem; font-weight: 700; color: var(--green-600); margin: 0; }
.evidence-card p { font-size: 0.88rem; color: var(--ink); line-height: 1.55; margin: 0; }
.evidence-card p.emphasis { font-weight: 700; }

/* ---- result panel ---- */
.main-panel.is-empty .result-content { display: none; }
.main-panel:not(.is-empty) .welcome { display: none; }

.result-content .card { margin-bottom: 16px; }

.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  margin: 0 0 8px;
}

.regime-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px 8px 8px;
  border-radius: 999px;
  margin-bottom: 10px;
  font-weight: 700;
}
.regime-badge.regime-1 { background: var(--regime1-bg); color: var(--regime1); }
.regime-badge.regime-2 { background: var(--regime2-bg); color: var(--regime2); }
.regime-badge.regime-3 { background: var(--regime3-bg); color: var(--regime3); }
.regime-roman {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
}
.regime-badge.regime-1 .regime-roman { background: var(--regime1); }
.regime-badge.regime-2 .regime-roman { background: var(--regime2); }
.regime-badge.regime-3 .regime-roman { background: var(--regime3); }
.regime-text { font-size: 0.92rem; }
.regime-blurb {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.5;
  max-width: 60ch;
  margin: 0 0 16px;
}

#resultProtein {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--blue-600);
  margin: 0 0 14px;
}

.descriptor-table-wrap {
  margin-bottom: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
table.descriptor-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
table.descriptor-table th {
  background: var(--bg);
  color: var(--ink-soft);
  text-transform: uppercase;
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  font-weight: 700;
  text-align: left;
  padding: 8px 10px;
}
table.descriptor-table td {
  padding: 9px 10px;
  border-top: 1px solid var(--border);
  vertical-align: top;
}
table.descriptor-table td.value { font-weight: 700; color: var(--ink); white-space: nowrap; }
table.descriptor-table td .source {
  display: block;
  font-weight: 400;
  font-size: 0.7rem;
  color: var(--ink-faint);
  margin-top: 1px;
  white-space: normal;
}
table.descriptor-table td.ref { color: var(--ink-soft); }

/* Below ~560px a 3-column table doesn't fit comfortably even with scroll,
   so each row becomes a stacked card instead (labels from data-label). */
@media (max-width: 560px) {
  .descriptor-table-wrap { overflow-x: visible; border: none; }
  table.descriptor-table, table.descriptor-table thead, table.descriptor-table tbody,
  table.descriptor-table th, table.descriptor-table td, table.descriptor-table tr {
    display: block;
  }
  table.descriptor-table thead { position: absolute; left: -9999px; }
  table.descriptor-table tr {
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 10px;
    padding: 4px 12px;
  }
  table.descriptor-table tr:last-child { margin-bottom: 0; }
  table.descriptor-table td {
    border-top: none;
    padding: 8px 0;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
  }
  table.descriptor-table td + td { border-top: 1px solid var(--border); }
  table.descriptor-table td.value { white-space: normal; text-align: right; }
  table.descriptor-table td::before {
    content: attr(data-label);
    font-weight: 700;
    font-size: 0.66rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--ink-soft);
    flex-shrink: 0;
  }
}

.notes {
  background: #eaf1fb;
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 16px;
}
.notes ul { margin: 0; padding-left: 18px; }
.notes li { font-size: 0.86rem; color: var(--ink); margin-bottom: 6px; line-height: 1.4; }
.notes li:last-child { margin-bottom: 0; }
.notes-empty { font-size: 0.86rem; color: var(--ink-soft); margin: 0; }

.result-actions {
  display: flex;
  gap: 10px;
}

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 60px 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.spinner {
  width: 30px; height: 30px;
  border: 3px solid var(--border);
  border-top-color: var(--blue-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.disclaimer {
  font-size: 0.76rem;
  color: var(--ink-faint);
  line-height: 1.5;
  margin: 0;
}

/* ---- footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--card-bg);
  margin-top: 32px;
}
.footer-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 32px 20px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 420px;
}
.footer-brand .logo-mark { width: 45px; height: 45px; flex-shrink: 0; display: block; object-fit: contain; }
.footer-brand .name { font-size: 1.1rem; font-weight: 800; margin: 0 0 2px; }
.footer-brand .desc { font-size: 0.88rem; color: var(--ink-soft); margin: 0; line-height: 1.5; }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  white-space: nowrap;
}
.footer-links a img { height: 18px; width: auto; display: block; }
.footer-links a:hover { color: var(--blue-600); border-color: var(--blue-500); }

.footer-bottom {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 14px 20px 22px;
  border-top: 1px solid var(--border);
}
.footer-bottom p {
  font-size: 0.74rem;
  color: var(--ink-faint);
  line-height: 1.5;
  margin: 0;
}

/* ---- about / article page ---- */
.article {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 56px;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--blue-600);
  text-decoration: none;
  margin-bottom: 18px;
}
.back-link:hover { text-decoration: underline; }
.page-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--ink);
  margin: 0 0 10px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.page-lede {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--ink-soft);
  margin: 0 0 28px;
  line-height: 1.5;
}
.prose p {
  font-size: 0.96rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0 0 14px;
}
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--ink); }

.regime-explain-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin: 18px 0 22px;
}
.regime-explain {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
}
.regime-explain .regime-badge { margin-bottom: 10px; }
.regime-explain p {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0 0 8px;
}
.regime-explain p:last-child { margin-bottom: 0; }
.regime-explain p.for-you {
  color: var(--ink);
  font-weight: 600;
}

.decision-steps {
  margin: 4px 0 0;
  padding-left: 22px;
}
.decision-steps li {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.6;
  margin-bottom: 8px;
}
.decision-steps li:last-child { margin-bottom: 0; }
.decision-steps strong { color: var(--ink); }

.glossary {
  margin: 4px 0 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.glossary-item {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.glossary-item:last-child { border-bottom: none; padding-bottom: 0; }
.glossary-item dt {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--blue-600);
  margin: 0 0 4px;
}
.glossary-item dd {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0;
}

/* ---- about page: sidebar navigation + sections ---- */
.about-nav { display: flex; flex-direction: column; }
.about-nav-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: left;
  width: 100%;
  padding: 13px 18px;
  border: none;
  border-bottom: 1px solid var(--border);
  border-left: 3px solid transparent;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
}
.about-nav-item:last-child { border-bottom: none; }
.about-nav-title { font-size: 0.9rem; font-weight: 700; color: var(--ink); }
.about-nav-desc { font-size: 0.76rem; color: var(--ink-soft); margin-top: 1px; }
.about-nav-item.active { background: #eaf1fb; border-left-color: var(--blue-600); }
.about-nav-item.active .about-nav-title { color: var(--blue-600); }
@media (hover: hover) {
  .about-nav-item:not(.active):hover { background: var(--bg); }
}

.about-section.hidden { display: none; }

.method-list { margin: 8px 0 0; padding-left: 20px; }
.method-list li { font-size: 0.92rem; color: var(--ink-soft); line-height: 1.6; margin-bottom: 8px; }
.method-list li:last-child { margin-bottom: 0; }
.method-list strong { color: var(--ink); }

.footnote {
  font-size: 0.8rem;
  color: var(--ink-faint);
  line-height: 1.55;
  margin: 8px 0 0;
}
.footnote sup { font-weight: 700; }

.validation-table-wrap {
  margin: 14px 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
table.validation-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
table.validation-table th {
  background: var(--bg);
  color: var(--ink-soft);
  text-transform: uppercase;
  font-size: 0.64rem;
  letter-spacing: 0.04em;
  font-weight: 700;
  text-align: left;
  padding: 8px 10px;
  white-space: nowrap;
}
table.validation-table td {
  padding: 9px 10px;
  border-top: 1px solid var(--border);
  vertical-align: top;
  color: var(--ink);
}
table.validation-table td:first-child { font-weight: 600; }