/* ─── Font ──────────────────────────────────────────────────── */
@font-face {
  font-family: 'TTPositive';
  src: url('../fonts/TTPositive-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'TTPositive';
  src: url('../fonts/TTPositive-Medium.ttf') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'TTPositive';
  src: url('../fonts/TTPositive-Bold.ttf') format('truetype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

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

html { font-size: 120%; }

:root {
  --bg:          #F0F2F5;
  --surface:     #FFFFFF;
  --border:      #DDE1E7;
  --text-primary:#1A1D23;
  --text-muted:  #6B7280;
  --accent:      #2E4D7B;
  --accent-dark: #1E3558;
  --accent-light:#EEF2F8;
  --btn-selected:#2E4D7B;
  --btn-hover:   #F5F7FB;
  --radius:      9.6px;
  --radius-lg:   14.4px;
  --shadow:      0 1px 3.6px rgba(0,0,0,.08), 0 1px 2.4px rgba(0,0,0,.06);
  --shadow-md:   0 4.8px 14.4px rgba(0,0,0,.10);

  --none:        #6B7280;
  --low:         #43c548;
  --medium:      #ff8f05;
  --high:        #FF0000;
  --critical:    #C00000;
}

body {
  font-family: 'TTPositive', sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
}

/* ─── Nav ───────────────────────────────────────────────────── */
nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 38.4px;
  height: 72px;
  gap: 48px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -.3.6px;
  flex-shrink: 0;
}

.nav-logo svg { flex-shrink: 0; }

.nav-links {
  display: flex;
  gap: 4.8px;
  flex: 1;
}

.nav-link {
  padding: 7.2px 19.2px;
  border-radius: var(--radius);
  font-size: 16.8px;
  font-family: 'TTPositive', sans-serif;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  cursor: pointer;
  transition: color .15s, background .15s;
  border: none;
  background: none;
}

.nav-link:hover { color: var(--text-primary); background: var(--btn-hover); }
.nav-link.active { color: var(--text-primary); }

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  background: #F0F2F5;
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 3.6px;
  gap: 2.4px;
  margin-left: auto;
}

.lang-btn {
  padding: 4.8px 14.4px;
  border-radius: 19.2px;
  font-size: 15.6px;
  font-family: 'TTPositive', sans-serif;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background .2s, color .2s, box-shadow .2s;
  background: transparent;
  color: var(--text-muted);
}

.lang-btn.active {
  background: var(--surface);
  color: var(--text-primary);
  box-shadow: 0 1px 3.6px rgba(0,0,0,.12);
}

/* ─── Page Layout ───────────────────────────────────────────── */
.page-content {
  max-width: 1416px;
  margin: 48px auto;
  padding: 0 28.8px;
  display: grid;
  grid-template-columns: 1fr 552px;
  gap: 33.6px;
  align-items: start;
}

/* ─── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-header {
  padding: 21.6px 28.8px 16.8px;
  font-size: 21.6px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.2.4px;
}

/* ─── Metric Groups ─────────────────────────────────────────── */
.metrics-card { padding-bottom: 9.6px; }

.section-divider {
  display: flex;
  align-items: center;
  padding: 12px 28.8px 7.2px;
  gap: 12px;
}

.section-divider-label {
  font-size: 15.6px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .7.2px;
  white-space: nowrap;
}

.section-divider-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

.metric-group {
  padding: 12px 28.8px 16.8px;
}

.metric-label {
  font-size: 14.4px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 9.6px;
  cursor: help;
  display: inline-block;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 9.6px;
}

/* Hide native radio */
.metric-group input[type="radio"] { display: none; }

.metric-group label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8.4px 19.2px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  font-size: 15.6px;
  font-family: 'TTPositive', sans-serif;
  font-weight: 400;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s, box-shadow .15s;
  user-select: none;
  white-space: nowrap;
}

.metric-group label:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}

.metric-group input[type="radio"]:checked + label {
  background: var(--btn-selected);
  border-color: var(--btn-selected);
  color: #fff;
  font-weight: 500;
  box-shadow: 0 2.4px 7.2px rgba(46,77,123,.30);
}

/* ─── Result Card ───────────────────────────────────────────── */
.result-card {
  position: sticky;
  top: 96px;
}

.result-card .card-header {
  padding-bottom: 19.2px;
  border-bottom: 1px solid var(--border);
}

.result-body { padding: 24px 24px 19.2px; }

.result-field-label {
  font-size: 13.2px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .7.2px;
  color: var(--text-muted);
  margin-bottom: 7.2px;
}

.score-display {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 14.4px 19.2px;
  margin-bottom: 19.2px;
  border: 1px solid var(--border);
  min-height: 57.6px;
  display: flex;
  align-items: center;
}

#final-score {
  font-size: 26.4px;
  font-weight: 700;
  letter-spacing: -.3.6px;
  transition: color .3s;
}

.final-score-none     { color: var(--none); }
.final-score-low      { color: var(--low); }
.final-score-medium   { color: var(--medium); }
.final-score-high     { color: var(--high); }
.final-score-critical { color: var(--critical); }

.vector-display {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 13.2px 19.2px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color .15s, background .15s;
  position: relative;
  overflow: hidden;
}

.vector-display:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

#vector-container {
  font-family: 'DM Mono', 'Courier New', monospace;
  font-size: 15px;
  color: var(--text-primary);
  word-break: break-all;
  line-height: 1.5;
}

.copy-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4.8px;
  opacity: .75;
}

.result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn-primary,
.btn-secondary {
  padding: 12px;
  border-radius: var(--radius);
  font-size: 16.8px;
  font-family: 'TTPositive', sans-serif;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background .15s, box-shadow .15s, transform .1s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2.4px 7.2px rgba(46,77,123,.3);
}

.btn-primary:hover  { background: var(--accent-dark); box-shadow: 0 4.8px 12px rgba(46,77,123,.35); }
.btn-primary:active { transform: translateY(1px); }

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover  { background: var(--btn-hover); border-color: #b5bec9; }
.btn-secondary:active { transform: translateY(1px); }

/* ─── Info Bar ──────────────────────────────────────────────── */
.info-bar {
  grid-column: 1 / -1;
  background: var(--accent-light);
  border: 1px solid #c9d8ee;
  border-radius: var(--radius);
  padding: 12px 19.2px;
  font-size: 15.6px;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 9.6px;
  margin-bottom: -9.6px;
}

.info-bar svg { flex-shrink: 0; }

/* ─── Copy Toast ────────────────────────────────────────────── */
#copy-toast {
  position: fixed;
  bottom: 33.6px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: #1A1D23;
  color: #fff;
  padding: 12px 24px;
  border-radius: 24px;
  font-size: 15.6px;
  font-family: 'TTPositive', sans-serif;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s, transform .25s;
  z-index: 9999;
  white-space: nowrap;
}

#copy-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ─── Single-column page layout (Description / Examples) ────── */
.page-content-single {
  max-width: 1080px;
  margin: 57.6px auto;
  padding: 0 28.8px;
  display: flex;
  flex-direction: column;
  gap: 38.4px;
}

/* ─── Description page ───────────────────────────────────────── */
.desc-intro {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 43.2px 48px;
  box-shadow: var(--shadow);
}

.desc-intro h1 {
  font-size: 31.2px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16.8px;
  letter-spacing: -.4.8px;
}

.desc-intro p {
  font-size: 18px;
  line-height: 1.75;
  color: var(--text-primary);
  margin-bottom: 14.4px;
}

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

#metric-blocks {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Metric description block */
.metric-desc-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.metric-desc-header {
  padding: 26.4px 33.6px 21.6px;
  border-bottom: 1px solid var(--border);
  background: var(--accent-light);
}

.metric-desc-header h2 {
  font-size: 21.6px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -.2.4px;
  margin-bottom: 9.6px;
}

.metric-desc-header p {
  font-size: 16.8px;
  line-height: 1.65;
  color: var(--accent);
  opacity: .85;
}

/* Values table */
.metric-values-table {
  width: 100%;
  border-collapse: collapse;
}

.metric-values-table thead th {
  padding: 14.4px 24px;
  font-size: 13.2px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .8.4px;
  color: var(--text-muted);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.metric-values-table thead th:first-child { width: 264px; }

.metric-values-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background .12s;
}

.metric-values-table tbody tr:last-child { border-bottom: none; }
.metric-values-table tbody tr:hover { background: var(--btn-hover); }

.metric-values-table tbody td {
  padding: 16.8px 24px;
  font-size: 16.8px;
  line-height: 1.6;
  color: var(--text-primary);
  vertical-align: top;
}

.metric-value-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4.8px 14.4px;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font-size: 14.4px;
  font-weight: 700;
  font-family: 'DM Mono', monospace;
  margin-bottom: 4.8px;
  letter-spacing: .3.6px;
}

.metric-value-name {
  display: block;
  font-size: 15.6px;
  font-weight: 500;
  color: var(--text-primary);
  margin-top: 6px;
}

/* ─── Examples page ──────────────────────────────────────────── */
.example-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.example-card-header {
  padding: 24px 33.6px 19.2px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16.8px;
}

.example-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38.4px;
  height: 38.4px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 15.6px;
  font-weight: 700;
  flex-shrink: 0;
}

.example-card-header h3 {
  font-size: 19.2px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.2.4px;
}

.example-body { padding: 28.8px 33.6px; }

.example-scenario {
  background: var(--accent-light);
  border: 1px solid #c9d8ee;
  border-radius: var(--radius);
  padding: 16.8px 21.6px;
  font-size: 16.8px;
  line-height: 1.65;
  color: var(--accent);
  margin-bottom: 26.4px;
}

.example-result-row {
  display: flex;
  align-items: center;
  gap: 19.2px;
  margin-bottom: 19.2px;
  flex-wrap: wrap;
}

.example-score-badge {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -.3.6px;
  white-space: nowrap;
}

.example-score-badge.score-none     { color: var(--none); }
.example-score-badge.score-low      { color: var(--low); }
.example-score-badge.score-medium   { color: var(--medium); }
.example-score-badge.score-high     { color: var(--high); }
.example-score-badge.score-critical { color: var(--critical); }

.example-vector {
  font-family: 'DM Mono', 'Courier New', monospace;
  font-size: 15px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 7.2px 14.4px;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color .15s, background .15s;
  white-space: nowrap;
}

.example-vector:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}

.example-breakdown {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.example-breakdown-row {
  display: grid;
  grid-template-columns: 144px 1fr;
  border-bottom: 1px solid var(--border);
  transition: background .12s;
}

.example-breakdown-row:last-child { border-bottom: none; }
.example-breakdown-row:hover { background: var(--btn-hover); }

.example-breakdown-key {
  padding: 12px 16.8px;
  font-family: 'DM Mono', 'Courier New', monospace;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  border-right: 1px solid var(--border);
  background: var(--accent-light);
  display: flex;
  align-items: center;
}

.example-breakdown-val {
  padding: 12px 16.8px;
  font-size: 16.2px;
  line-height: 1.55;
  color: var(--text-primary);
  display: flex;
  align-items: center;
}

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 984px) {
  .page-content { grid-template-columns: 1fr; }
  .result-card  { position: static; }
  nav           { padding: 0 19.2px; gap: 24px; }
  .page-content { margin: 24px auto; }
  .page-content-single { margin: 28.8px auto; padding: 0 19.2px; }
  .desc-intro { padding: 28.8px 24px; }
  .example-body { padding: 21.6px 19.2px; }
  .example-breakdown-row { grid-template-columns: 120px 1fr; }
  .metric-values-table thead th:first-child { width: 192px; }
}

/* ─── Vector input (parse from string) ──────────────────────── */
.vector-input-divider {
  height: 1px;
  background: var(--border);
  margin: 19.2px 0 16.8px;
}

.vector-input-wrap {
  display: flex;
  gap: 9.6px;
  margin-bottom: 7.2px;
}

#vector-input {
  flex: 1;
  font-family: 'DM Mono', 'Courier New', monospace;
  font-size: 14.4px;
  padding: 9.6px 14.4px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text-primary);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  min-width: 0;
}

#vector-input::placeholder { color: var(--text-muted); opacity: .6; }
#vector-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3.6px rgba(46,77,123,.12); }
#vector-input.is-error { border-color: var(--high); box-shadow: 0 0 0 3.6px rgba(220,38,38,.10); }
#vector-input.is-success { border-color: #16a34a; box-shadow: 0 0 0 3.6px rgba(22,163,74,.10); }

.btn-parse {
  padding: 9.6px 16.8px;
  border-radius: var(--radius);
  font-size: 15.6px;
  font-family: 'TTPositive', sans-serif;
  font-weight: 500;
  border: 1.5px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s, color .15s, transform .1s;
  flex-shrink: 0;
}

.btn-parse:hover  { background: var(--accent); color: #fff; }
.btn-parse:active { transform: translateY(1px); }

#vector-input-error {
  font-size: 14.4px;
  color: var(--high);
  min-height: 19.2px;
  line-height: 1.4;
}

/* ─── Share button ───────────────────────────────────────────── */
.btn-share {
  width: 100%;
  justify-content: center;
}

/* ─── Description page section headings ─────────────────────── */
.desc-section-heading {
  font-size: 21.6px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.3px;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--accent);
  margin-bottom: -16px;
}

.desc-section-intro {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: -8px;
}

/* ─── Metric notes (info callouts inside metric blocks) ─────── */
.metric-notes {
  padding: 14px 24px;
  background: #fffbeb;
  border-bottom: 1px solid #fde68a;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.metric-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: #92400e;
}

.metric-note-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #f59e0b;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}

/* ─── Formula MathML blocks ─────────────────────────────────── */
.formula-mathml-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  overflow-x: auto;
  text-align: center;
}

.formula-mathml-block math {
  font-size: 1.15em;
}

/* ─── Formula symbol table ──────────────────────────────────── */
.formula-symbol-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'TTPositive', sans-serif;
  font-size: 14px;
}

.formula-symbol-table thead th {
  background: var(--bg);
  color: var(--accent);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .6px;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 2px solid #c9d8ee;
}

.formula-symbol-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background .12s;
}

.formula-symbol-table tbody tr:last-child { border-bottom: none; }
.formula-symbol-table tbody tr:hover { background: var(--btn-hover); }

.formula-symbol-table tbody td {
  padding: 10px 14px;
  vertical-align: middle;
  line-height: 1.55;
  color: var(--text-primary);
}

.formula-symbol-table tbody td:first-child {
  font-family: 'DM Mono', 'Courier New', monospace;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
  width: 90px;
}

.formula-symbol-table tbody td:nth-child(2) {
  width: 220px;
  color: var(--text-muted);
  font-weight: 500;
}

.formula-symbol-table math {
  font-size: 1em;
}

/* ─── Formula special case note ─────────────────────────────── */
.formula-special-note {
  margin-top: 20px;
  padding: 13px 17px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.65;
  color: #92400e;
}