:root {
  --font-sans: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --radius-1: 8px;
  --radius-2: 16px;
  --radius-3: 22px;

  --surface-0: #f4f7fb;
  --surface-1: #ffffff;
  --surface-2: #f7fafc;
  --surface-3: #eef2f7;
  --surface-nav: #1e3a5f;

  --text-1: #0f172a;
  --text-2: #334155;
  --text-3: #64748b;
  --text-on-nav: #ffffff;

  --border-1: rgba(15,23,42,.10);
  --border-2: rgba(15,23,42,.18);

  --shadow-1: 0 1px 2px rgba(0,0,0,.06);
  --shadow-2: 0 12px 30px rgba(0,0,0,.12);

  --input-bg: #ffffff;
  --input-border: rgba(15,23,42,.18);
  --input-border-focus: #3b82f6;

  --accent: #2f6fb2;
  --accent-hover: #2563a6;

  --state-success-bg: #f0fdf4;
  --state-success-border: #86efac;
  --state-success-text: #166534;

  --state-warning-bg: #fffbeb;
  --state-warning-border: #f59e0b;
  --state-warning-text: #92400e;

  --state-danger-bg: #fef2f2;
  --state-danger-border: #ef4444;
  --state-danger-text: #991b1b;

  --state-info-bg: #eff6ff;
  --state-info-border: #60a5fa;
  --state-info-text: #1d4ed8;
}

[data-theme="dark"] {
  --surface-0: #0b1420;
  --surface-1: #0f1c2b;
  --surface-2: #122235;
  --surface-3: #15283f;
  --surface-nav: #071321;

  --text-1: #d6e1ee;
  --text-2: #b5c4d6;
  --text-3: #8ea3b8;
  --text-on-nav: #d6e1ee;

  --border-1: rgba(142,163,184,.16);
  --border-2: rgba(142,163,184,.26);

  --shadow-1: 0 1px 2px rgba(0,0,0,.30);
  --shadow-2: 0 10px 28px rgba(0,0,0,.38);

  --input-bg: #0f1c2b;
  --input-border: rgba(142,163,184,.22);
  --input-border-focus: #6b93c9;

  --accent: #4f7fb8;
  --accent-hover: #6593cc;

  --state-success-bg: rgba(76,130,96,.16);
  --state-success-border: rgba(76,130,96,.30);
  --state-success-text: #a7d2b7;

  --state-warning-bg: rgba(155,130,70,.15);
  --state-warning-border: rgba(155,130,70,.30);
  --state-warning-text: #d8c28a;

  --state-danger-bg: rgba(145,75,80,.15);
  --state-danger-border: rgba(145,75,80,.30);
  --state-danger-text: #e3b2b6;

  --state-info-bg: rgba(84,124,174,.15);
  --state-info-border: rgba(84,124,174,.30);
  --state-info-text: #b9d0ef;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top, rgba(59,130,246,.08), transparent 30%),
    linear-gradient(180deg, var(--surface-0) 0%, var(--surface-0) 100%);
  color: var(--text-1);
}

[data-theme="dark"] body,
body[data-theme="dark"] {
  background:
    radial-gradient(circle at top, rgba(91,141,239,.16), transparent 34%),
    linear-gradient(180deg, rgba(4,15,32,.96) 0%, rgba(3,12,26,1) 100%);
}

a { color: inherit; }

.topbar {
  background: var(--surface-nav);
  color: var(--text-on-nav);
  border-bottom: 1px solid var(--border-1);
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: .85rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-weight: 700;
  letter-spacing: .2px;
}

.brand-mark {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background: linear-gradient(180deg, rgba(79,127,184,.95), rgba(79,127,184,.45));
  border: 1px solid rgba(214,225,238,.22);
  flex: 0 0 auto;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--surface-1);
  border: 1px solid var(--border-2);
  border-radius: 18px;
  box-shadow: var(--shadow-2);
}

.panel-soft {
  background: linear-gradient(180deg, var(--surface-1) 0%, var(--surface-2) 100%);
}

.panel-body {
  padding: 1.35rem 1.35rem 1.2rem;
}

.eyebrow {
  margin: 0 0 .6rem;
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-title {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  line-height: 1.05;
}

.page-subtitle {
  margin: .8rem 0 0;
  color: var(--text-2);
  line-height: 1.55;
  max-width: 56rem;
}

.meta-list {
  display: grid;
  gap: .8rem;
}

.meta-item {
  padding: .95rem 1rem;
  border: 1px solid var(--border-1);
  border-radius: 14px;
  background: rgba(255,255,255,.45);
}

[data-theme="dark"] .meta-item {
  background: rgba(255,255,255,.03);
}

.meta-label {
  display: block;
  font-size: .77rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: .25rem;
}

.meta-value {
  font-size: .98rem;
  color: var(--text-1);
}

.form-card,
.result-card,
.feedback-card {
  margin-top: 1.25rem;
}

label {
  display: block;
  margin-bottom: .45rem;
  font-weight: 600;
  color: var(--text-2);
}

textarea,
input[type="number"] {
  width: 100%;
  box-sizing: border-box;
  font: inherit;
  color: var(--text-1);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 14px;
  padding: .9rem 1rem;
  outline: none;
  transition: border-color 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

textarea {
  min-height: 220px;
  resize: vertical;
  line-height: 1.5;
}

textarea:focus,
input[type="number"]:focus {
  border-color: var(--input-border-focus);
  box-shadow: 0 0 0 3px rgba(59,130,246,.12);
}

.help-text {
  margin: .75rem 0 0;
  color: var(--text-3);
}

.button-row {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 1rem;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: .78rem 1rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease, border-color 120ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-1);
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text-1);
  border-color: var(--border-2);
}

.btn-secondary:hover {
  background: var(--surface-3);
}

.btn-toggle {
  background: rgba(255,255,255,.08);
  color: var(--text-on-nav);
  border-color: rgba(255,255,255,.16);
}

.btn-toggle:hover {
  background: rgba(255,255,255,.14);
}

.banner {
  margin-top: 1rem;
  padding: .95rem 1rem;
  border-radius: 14px;
  border: 1px solid;
  font-weight: 600;
}

.banner-success {
  background: var(--state-success-bg);
  border-color: var(--state-success-border);
  color: var(--state-success-text);
}

.banner-danger {
  background: var(--state-danger-bg);
  border-color: var(--state-danger-border);
  color: var(--state-danger-text);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .42rem .68rem;
  border-radius: 999px;
  font-size: .84rem;
  font-weight: 700;
  border: 1px solid;
}

.badge-danger {
  background: var(--state-danger-bg);
  border-color: var(--state-danger-border);
  color: var(--state-danger-text);
}

.badge-success {
  background: var(--state-success-bg);
  border-color: var(--state-success-border);
  color: var(--state-success-text);
}

.section-title {
  margin: 0 0 1rem;
  font-size: 1.35rem;
}

.result-grid {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  gap: 1rem;
}

@media (max-width: 980px) {
  .result-grid {
    grid-template-columns: 1fr;
  }
}

.data-list {
  display: grid;
  grid-template-columns: minmax(140px, 180px) 1fr;
  gap: .55rem .9rem;
  align-items: start;
}

.data-list dt {
  margin: 0;
  color: var(--text-3);
  font-weight: 700;
}

.data-list dd {
  margin: 0;
  color: var(--text-1);
}

.code-block {
  margin: 0;
  padding: 1rem;
  border-radius: 14px;
  border: 1px solid var(--border-1);
  background: var(--surface-2);
  color: var(--text-1);
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
  max-height: 420px;
  font-size: .84rem;
  line-height: 1.5;
}

.highlight-box {
  padding: 1rem;
  border: 1px solid var(--border-1);
  border-radius: 14px;
  background: var(--surface-2);
  line-height: 1.6;
}

mark {
  background: rgba(255, 196, 0, .22);
  color: inherit;
  padding: .05rem .18rem;
  border-radius: 4px;
  border: 1px solid rgba(255, 196, 0, .28);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-1);
  border-radius: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  background: var(--surface-1);
}

th, td {
  padding: .8rem .9rem;
  text-align: left;
  border-bottom: 1px solid var(--border-1);
  vertical-align: top;
}

th {
  background: var(--surface-2);
  color: var(--text-2);
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}

tr:last-child td {
  border-bottom: none;
}

.feedback-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 760px) {
  .feedback-grid {
    grid-template-columns: 1fr;
  }
}

.feedback-list {
  display: grid;
  gap: .9rem;
  margin-top: 1rem;
}

.feedback-item {
  padding: .95rem 1rem;
  border: 1px solid var(--border-1);
  border-radius: 14px;
  background: var(--surface-2);
}

.feedback-item p {
  margin: .2rem 0;
}

.stack {
  display: grid;
  gap: 1.25rem;
}

.feedback-toggle-group {
  display: grid;
  gap: .8rem;
}

.feedback-toggle-label {
  font-weight: 700;
  color: var(--text-2);
}

.feedback-toggle-buttons {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
}

.feedback-toggle.is-active {
  box-shadow: var(--shadow-1);
}

.incorrect-panel {
  margin-top: 1rem;
  display: grid;
  gap: 1rem;
}

.is-hidden {
  display: none !important;
}

.banner-warning {
  background: var(--state-warning-bg);
  border-color: var(--state-warning-border);
  color: var(--state-warning-text);
}

.correction-source {
  min-height: 180px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.correction-table-wrap {
  margin-top: .25rem;
}

#selected-spans-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .84rem;
}

.saved-span-list {
  margin: .4rem 0 0 1.1rem;
  padding: 0;
}

.saved-span-list li {
  margin: .2rem 0;
}

.result-topbar {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.confidence-card {
  min-width: 220px;
  padding: 1rem 1.1rem;
  border-radius: 16px;
  border: 1px solid color-mix(in srgb, hsl(calc(var(--score-pct) * 1.2), 72%, 45%) 45%, var(--border-2));
  background:
    linear-gradient(180deg,
      color-mix(in srgb, hsl(calc(var(--score-pct) * 1.2), 72%, 45%) 12%, var(--surface-1)),
      var(--surface-2));
  box-shadow: var(--shadow-1);
}

.confidence-label {
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: .35rem;
}

.confidence-value {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1;
  font-weight: 800;
  color: hsl(calc(var(--score-pct) * 1.2), 72%, 42%);
}

.feedback-submode-group {
  display: grid;
  gap: .75rem;
  margin-top: 1rem;
}

.feedback-submode-option {
  display: flex;
  align-items: flex-start;
  gap: .65rem;
  padding: .9rem 1rem;
  border: 1px solid var(--border-1);
  border-radius: 14px;
  background: var(--surface-2);
}

.feedback-submode-option input[type="radio"] {
  margin-top: .15rem;
}

.correction-span-panel {
  margin-top: 1rem;
  display: grid;
  gap: 1rem;
}