/* ── Brand header ─────────────────────────────────────────── */

.brand {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: var(--space-8);
}

.brand-logo {
  height: 44px;
  width: auto;
  display: block;
  flex-shrink: 0;
  margin-top: 4px;
}

.brand-title-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 36px;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-text-primary);
}

.brand-tagline {
  margin: 0;
  font-weight: 300;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

/* ── Input section ────────────────────────────────────────── */

.input-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.input-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
}

.message-input {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  width: 100%;
  min-height: 160px;
  resize: vertical;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.message-input::placeholder {
  color: var(--color-text-weak);
}

.message-input:focus {
  outline: none;
  border-color: var(--color-brand-orange);
  box-shadow: 0 0 0 3px var(--color-interactive-weak);
}

.input-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--color-text-secondary);
}

.meta-label {
  font-weight: 500;
}

.meta-value {
  font-family: var(--font-mono);
  color: var(--color-brand-orange);
  font-size: 13px;
}

.controls-grid {
  display: flex;
  flex-direction: row;
  gap: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.controls-grid .control-group {
  flex: 1;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.control-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.select-control {
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
}

.select-control:focus {
  outline: none;
  border-color: var(--color-brand-orange);
  box-shadow: 0 0 0 3px var(--color-interactive-weak);
}

.toggle-group {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-strong);
}

.toggle-option {
  position: relative;
  font-size: 13px;
}

.toggle-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-option span {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color 0.15s ease, background 0.15s ease;
  cursor: pointer;
}

.toggle-option input:checked + span {
  color: var(--color-bg-page);
  background: var(--color-brand-orange);
}

.toggle-option input:focus-visible + span {
  outline: 2px solid var(--color-brand-orange);
  outline-offset: 2px;
}

/* ── Tooltip ──────────────────────────────────────────────── */

.tooltip-anchor {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.tooltip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid var(--color-text-secondary);
  color: var(--color-text-secondary);
  font-size: 9px;
  font-weight: 700;
  font-style: normal;
  cursor: default;
  line-height: 1;
  transition: border-color 0.15s, color 0.15s;
}

.tooltip-anchor:hover .tooltip-icon {
  border-color: var(--color-brand-orange);
  color: var(--color-brand-orange);
}

.tooltip-body {
  display: none;
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: 260px;
  background: var(--color-bg-surface-raised);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-secondary);
  text-transform: none;
  letter-spacing: 0;
  white-space: normal;
  z-index: 10;
  pointer-events: none;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* Arrow */
.tooltip-body::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--color-border-strong);
}

.tooltip-anchor:hover .tooltip-body,
.tooltip-anchor:focus-within .tooltip-body {
  display: block;
}

/* ── Two-column layout ────────────────────────────────────── */

main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

.left-col {
  position: sticky;
  top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.input-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* ── Calculator section (always-visible, right column) ────── */

.calculator-section {
  border: none;
  background: transparent;
}

.calculator-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-6);
}

/* Orange left accent on section title */
.calculator-header h2 {
  position: relative;
  padding-left: var(--space-4);
}

.calculator-header h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 2px;
  bottom: 2px;
  width: 3px;
  border-radius: 2px;
  background: var(--color-brand-orange);
}

.calculator-desc {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-secondary);
}

.calculator-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

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

  .left-col {
    position: static;
  }
}


/* ── Stats strip ──────────────────────────────────────────── */

.stats-bar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.stat-chip {
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* Remove right border on even chips (right column) */
.stat-chip:nth-child(2n) {
  border-right: none;
}

/* Remove bottom border on last row */
.stat-chip:nth-last-child(-n+2) {
  border-bottom: none;
}

.stat-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1;
}

.stat-value.is-multi {
  color: var(--color-brand-orange);
}

.stat-value.is-low {
  color: var(--color-brand-orange);
}

.encoding-badge {
  border-right: 1px solid var(--color-border);
}

.encoding-badge .stat-label,
.encoding-badge .stat-value {
  color: inherit;
}

.encoding-badge .stat-label {
  opacity: 0.7;
}

.encoding-badge[data-encoding="gsm7"] {
  color: var(--color-gsm7);
  background: rgba(0, 175, 220, 0.06);
}

.encoding-badge[data-encoding="unicode"] {
  color: var(--color-unicode);
  background: rgba(255, 138, 0, 0.06);
}

/* ── Segment tape ─────────────────────────────────────────── */

.segment-tape-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.segment-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.segment-bar {
  height: 28px;
  background: var(--color-segment-empty);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--color-border);
}

.segment-bar::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 1px;
  height: 100%;
  background: var(--color-segment-boundary);
}

.segment-fill {
  height: 100%;
  background: var(--color-brand-orange);
  border-radius: var(--radius-sm);
  transition: width 0.1s ease;
  opacity: 0.9;
}

.segment-fill.near-full {
  background: var(--color-brand-orange);
  opacity: 1;
}

.segment-fill.full {
  background: var(--color-error);
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  opacity: 1;
}

.segment-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-secondary);
}

/* ── Character detail ─────────────────────────────────────── */

.char-detail-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.char-detail-section summary {
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-surface);
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.char-detail-section[open] summary {
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.char-detail-container {
  padding: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  line-height: 1;
  background: var(--color-bg-surface);
}

.char-block {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 4px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: default;
  border: 1px solid transparent;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.char-block:hover {
  transform: scale(1.18);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
  z-index: 1;
  position: relative;
}

.char-block.seg-0 { background: var(--color-seg-0-bg); color: var(--color-seg-0-fg); }
.char-block.seg-1 { background: var(--color-seg-1-bg); color: var(--color-seg-1-fg); }
.char-block.seg-2 { background: var(--color-seg-2-bg); color: var(--color-seg-2-fg); }
.char-block.seg-3 { background: var(--color-seg-3-bg); color: var(--color-seg-3-fg); }
.char-block.seg-4 { background: var(--color-seg-4-bg); color: var(--color-seg-4-fg); }

.char-block.non-gsm {
  border-color: var(--color-error);
  color: var(--color-error);
  background: rgba(255, 68, 68, 0.1);
}

/* ── Encoding details accordion ───────────────────────────── */

.encoding-details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.encoding-details summary {
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-surface);
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.encoding-details[open] summary {
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.details-body {
  padding: var(--space-5);
  background: var(--color-bg-surface);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.details-body p {
  margin: 0;
  line-height: 1.5;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-4);
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.detail-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.detail-value {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-primary);
}

.detail-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.detail-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-primary);
}

.detail-table th,
.detail-table td {
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-2) 0;
}

.detail-table th {
  color: var(--color-text-secondary);
  font-weight: 600;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.detail-warning {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: rgba(255, 68, 68, 0.08);
  border: 1px solid var(--color-error);
  color: var(--color-error);
  font-size: 13px;
  line-height: 1.5;
}

.detail-info {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-bg-surface-raised);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-secondary);
  font-size: 12px;
  line-height: 1.6;
}

.detail-info a {
  color: var(--color-brand-blue);
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* ── Bind CTA banner ───────────────────────────────────────── */

.page-footer {
  margin-top: var(--space-8);
}

.bind-cta {
  margin-bottom: var(--space-8);
  position: relative;
  background: var(--color-bg-surface-raised);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  overflow: hidden;
}

.bind-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, var(--color-brand-orange), var(--color-brand-blue), transparent);
}

.bind-cta-content {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  min-width: 0;
}

.bind-cta-logo {
  height: 24px;
  width: auto;
  flex-shrink: 0;
}

.bind-cta-text {
  min-width: 0;
}

.bind-cta-heading {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

.bind-cta-sub {
  margin: var(--space-1) 0 0;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.bind-cta-actions {
  display: flex;
  gap: var(--space-3);
  flex-shrink: 0;
}

.btn-cta-primary {
  display: inline-block;
  background: var(--color-brand-orange);
  color: #000;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s;
}

.btn-cta-primary:hover {
  background: var(--color-interactive-hover);
}

.btn-cta-secondary {
  display: inline-block;
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}

.btn-cta-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

@media (max-width: 700px) {
  .bind-cta {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-5) var(--space-5);
  }

  .bind-cta-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .bind-cta-actions {
    width: 100%;
    flex-direction: column;
  }

  .btn-cta-primary,
  .btn-cta-secondary {
    text-align: center;
  }
}