/* TC-Ledger — Professional Cryptographic Infrastructure Presentation */
/* Baseline & Modern Variables */

:root {
  --bg-primary: #080c13;
  --bg-secondary: #0e141f;
  --bg-tertiary: #141d2c;
  --bg-card: #101724;
  --bg-card-hover: #162032;
  --bg-input: #0b1018;

  --border-color: #1e293b;
  --border-subtle: #192334;
  --border-focus: #38bdf8;
  --border-card: #223046;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-dim: #64748b;
  --text-muted: #475569;

  --accent-cyan: #38bdf8;
  --accent-blue: #0ea5e9;
  --accent-indigo: #6366f1;
  --accent-green: #10b981;
  --accent-green-bg: rgba(16, 185, 129, 0.12);
  --accent-amber: #f59e0b;
  --accent-amber-bg: rgba(245, 158, 11, 0.12);
  --accent-red: #ef4444;
  --accent-red-bg: rgba(239, 68, 68, 0.12);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.12);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* Container & Typography */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

code, pre, .mono {
  font-family: var(--font-mono);
}

code {
  font-size: 0.9em;
  background: var(--bg-tertiary);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--accent-cyan);
  border: 1px solid var(--border-subtle);
}

/* Header & Sticky Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 12, 19, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: border-color var(--transition-fast);
}

.header-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-shield {
  font-size: 1.25rem;
  line-height: 1;
}

.logo-text {
  font-weight: 800;
  letter-spacing: 0.06em;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.version-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-item {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
}

.nav-item:hover, .nav-item:focus-visible {
  color: var(--text-primary);
  outline: none;
}

.nav-explorer-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.35rem 0.75rem;
  font-weight: 600;
}

.nav-explorer-btn:hover {
  background: rgba(56, 189, 248, 0.15);
  color: #fff;
  border-color: var(--accent-cyan);
}

.live-dot-nav {
  width: 7px;
  height: 7px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent-green);
}

.nav-external {
  color: var(--text-dim);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  font-family: inherit;
}

.btn-primary {
  background: var(--accent-cyan);
  color: #04101d;
}

.btn-primary:hover, .btn-primary:focus-visible {
  background: #7dd3fc;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.4);
  outline: none;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover, .btn-secondary:focus-visible {
  background: #1c273a;
  border-color: var(--border-focus);
  outline: none;
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.btn-outline:hover, .btn-outline:focus-visible {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-focus);
  outline: none;
}

.btn-large {
  padding: 0.85rem 1.6rem;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
}

.btn-arrow {
  transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* 1. Hero Section */
.hero-section {
  padding: 4.5rem 0 3.5rem 0;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  background: radial-gradient(circle at 50% 15%, rgba(56, 189, 248, 0.07) 0%, transparent 60%);
}

.hero-container {
  max-width: 860px;
}

.hero-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1.75rem;
  font-weight: 500;
}

.badge-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent-cyan);
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 1.25rem;
}

.hero-brand {
  color: var(--accent-cyan);
  letter-spacing: 0.04em;
  font-size: 1.75rem;
  display: inline-block;
  margin-bottom: 0.25rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 680px;
  margin: 0 auto 2.25rem auto;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* 2. Verify Retained Activity Section */
.verify-entry-section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-secondary);
}

.verify-box {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
}

.verify-box-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.verify-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  margin-bottom: 0.35rem;
}

.verify-subtitle {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.data-source-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-green);
}

.indicator-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
}

.live-pulse {
  animation: pulse-green 2s infinite ease-in-out;
}

@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.05); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.verify-form {
  margin-bottom: 1.25rem;
}

.input-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.input-wrap {
  flex: 1;
  min-width: 280px;
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-wrap:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.input-prefix {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-right: 0.6rem;
  user-select: none;
}

.did-text-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  padding: 0.85rem 0;
  width: 100%;
}

.did-text-input::placeholder {
  color: var(--text-muted);
}

.btn-verify {
  background: var(--accent-cyan);
  color: #04101d;
  font-weight: 700;
  padding: 0 1.5rem;
  height: 48px;
}

.btn-verify:hover {
  background: #7dd3fc;
}

.verify-quick-select {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
  margin-bottom: 1.25rem;
}

.quick-select-label {
  color: var(--text-dim);
  font-size: 0.82rem;
}

.quick-pill-btn {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-pill-btn:hover {
  background: #1d2738;
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.retention-callout-subtle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.85rem;
}

.retention-info-icon {
  color: var(--accent-cyan);
}

/* 3. Professional Live Result Preview */
.example-result-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
}

.example-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}

.example-card-tag {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.tag-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  letter-spacing: 0.04em;
}

.example-subtext {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.status-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.status-active {
  background: var(--accent-green-bg);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.example-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.meta-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.meta-value {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
}

.meta-value-mono {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-primary);
  word-break: break-all;
}

.status-text-active {
  color: var(--accent-green);
}

.example-rooms-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.example-room-chip {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
}

.room-chip-name {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent-cyan);
}

.room-chip-count {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.room-chip-verified {
  color: var(--accent-green);
  font-size: 0.78rem;
  font-weight: 600;
}

.example-footer-note {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.85rem;
  font-size: 0.82rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.inline-link {
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
}

.inline-link:hover {
  text-decoration: underline;
}

/* Sections General */
.section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3rem auto;
}

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 4. Pipeline Grid */
.pipeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.pipeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
  position: relative;
}

.pipeline-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-focus);
}

.stage-num {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
  opacity: 0.9;
}

.stage-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.stage-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* 5. Architecture Section */
.arch-diagram-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.arch-svg-wrap {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.arch-svg {
  width: 100%;
  min-width: 680px;
  height: auto;
  display: block;
}

.arch-note-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.arch-note-box strong {
  color: var(--text-primary);
}

/* 6. Capabilities Grid */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.25rem;
}

.cap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.cap-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
}

.cap-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.45rem;
}

.cap-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* 7. Trust Boundary Section */
.trust-boundary-banner {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.trust-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .trust-columns {
    grid-template-columns: 1fr;
  }
}

.trust-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.trust-card-verifies {
  border-top: 3px solid var(--accent-green);
}

.trust-card-limits {
  border-top: 3px solid var(--accent-red);
}

.trust-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.85rem;
}

.trust-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.04em;
}

.badge-green {
  background: var(--accent-green-bg);
  color: var(--accent-green);
}

.badge-red {
  background: var(--accent-red-bg);
  color: var(--accent-red);
}

.trust-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

.trust-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.trust-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  font-size: 0.9rem;
}

.trust-list li strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
  font-size: 0.92rem;
}

.trust-list li p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
}

.item-icon-green {
  color: var(--accent-green);
  font-weight: 800;
  font-size: 1.1rem;
  line-height: 1;
}

.item-icon-red {
  color: var(--accent-red);
  font-weight: 800;
  font-size: 1.1rem;
  line-height: 1;
}

/* 8. Retention Section */
.retention-section {
  background: var(--bg-secondary);
}

.retention-boundary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}

.retention-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.retention-heading {
  font-size: 1.65rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1rem;
}

.retention-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.retention-rule-callout {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.5rem;
  display: inline-block;
  margin-top: 0.5rem;
}

.retention-rule-callout code {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-amber);
  background: transparent;
  border: none;
  padding: 0;
}

/* 9. Modes Section */
.modes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .modes-grid {
    grid-template-columns: 1fr;
  }
}

.mode-explainer-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.mode-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
}

.mode-badge-live {
  background: var(--accent-green-bg);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.mode-badge-synthetic {
  background: rgba(99, 102, 241, 0.12);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.mode-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.mode-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.mode-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.mode-features li {
  position: relative;
  padding-left: 1.25rem;
}

.mode-features li::before {
  content: "•";
  color: var(--accent-cyan);
  position: absolute;
  left: 0;
  font-size: 1.1rem;
  line-height: 1;
}

/* Interactive Protocol Sandbox */
.sandbox-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.sandbox-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.sandbox-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.sandbox-btn-group {
  display: flex;
  gap: 0.5rem;
}

.sandbox-btn-group .btn.active {
  background: var(--accent-cyan);
  color: #04101d;
  border-color: var(--accent-cyan);
}

.sandbox-display-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 860px) {
  .sandbox-display-grid {
    grid-template-columns: 1fr;
  }
}

.field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  margin-bottom: 0.4rem;
}

.code-textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.75rem;
  resize: vertical;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.code-textarea:focus {
  border-color: var(--border-focus);
  outline: none;
}

.code-pre {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.75rem;
  overflow-x: auto;
  max-height: 120px;
}

.btn-block {
  width: 100%;
  height: 44px;
  margin-bottom: 1rem;
}

.result-box {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.75rem;
  margin-bottom: 0.85rem;
}

.result-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.badge-pending {
  background: var(--bg-tertiary);
  color: var(--text-dim);
}

.badge-valid {
  background: var(--accent-green-bg);
  color: var(--accent-green);
}

.badge-invalid {
  background: var(--accent-red-bg);
  color: var(--accent-red);
}

.result-time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.result-row {
  display: flex;
  flex-direction: column;
  margin-bottom: 0.75rem;
  gap: 0.2rem;
}

.r-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
}

.r-val {
  font-size: 0.88rem;
  color: var(--text-primary);
}

.r-val-mono {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  word-break: break-all;
}

/* 10. Technical Credibility */
.credibility-section {
  background: var(--bg-secondary);
}

.credibility-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 2.5rem auto;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.25rem;
  text-align: center;
}

.metric-val {
  font-family: var(--font-mono);
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1;
  margin-bottom: 0.6rem;
}

.metric-success {
  color: var(--accent-green);
}

.metric-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* 11. Read the Code CTA */
.cta-section {
  background: radial-gradient(circle at 50% 100%, rgba(56, 189, 248, 0.08) 0%, transparent 60%);
  text-align: center;
  padding: 5rem 0;
}

.cta-container {
  max-width: 800px;
}

.cta-heading {
  font-size: 2.25rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1rem;
}

.cta-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
}

.cta-btn-row {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* 14. Footer */
.site-footer {
  background: #05070a;
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem 0;
  margin-top: auto;
}

.footer-container {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

@media (max-width: 768px) {
  .footer-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.footer-tagline {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.footer-disclaimer {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
  border-left: 2px solid var(--border-color);
  padding-left: 0.75rem;
}

.footer-col-links {
  display: flex;
  gap: 3rem;
}

@media (max-width: 480px) {
  .footer-col-links {
    flex-direction: column;
    gap: 1.5rem;
  }
}

.footer-nav-col {
  display: flex;
  flex-direction: column;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  margin-bottom: 0.85rem;
  text-transform: uppercase;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-links-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}

.footer-links-list a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.5rem;
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Accessibility & Focus States */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Interactive Sandbox Specific Polish */
.pane-header-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.pane-footer-text {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

.pane-footer-text strong {
  color: var(--text-secondary);
}

.verification-step-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.v-step {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem;
}

.v-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-green-bg);
  color: var(--accent-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.v-icon.fail {
  background: var(--accent-red-bg);
  color: var(--accent-red);
}

.v-details {
  flex: 1;
  min-width: 0;
}

.v-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.v-hash {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  word-break: break-all;
  margin-bottom: 0.2rem;
}

.v-subtext {
  font-size: 0.75rem;
}

.text-dim {
  color: var(--text-dim);
}

.text-red {
  color: var(--accent-red);
}

.pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-pill);
}

.pill-green {
  background: var(--accent-green-bg);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.pill-red {
  background: var(--accent-red-bg);
  color: var(--accent-red);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.explanation-box {
  background: var(--bg-input);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-left: 3px solid var(--accent-green);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.explanation-box.fail {
  border-color: rgba(239, 68, 68, 0.3);
  border-left-color: var(--accent-red);
}

/* === RESPONSIVE & ACCESSIBILITY ENHANCEMENTS (V2 QA) === */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }
}

@media (max-width: 768px) {
  html, body {
    overflow-x: hidden;
  }

  .main-nav .nav-item:not(.nav-explorer-btn):not(.nav-external) {
    display: none;
  }

  .header-container {
    padding: 0.75rem 1rem;
  }

  .logo-text {
    font-size: 0.95rem;
  }

  .hero-section {
    padding: 3.5rem 1rem 2.5rem;
  }

  .hero-title {
    font-size: 1.45rem !important;
    line-height: 1.25 !important;
    word-break: break-word;
    letter-spacing: -0.01em;
  }

  .hero-brand {
    font-size: 1.2rem !important;
  }

  .hero-subtitle {
    font-size: 1rem;
    padding: 0 0.5rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    margin: 1.5rem auto 0;
    gap: 0.75rem;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .verify-entry-section {
    padding: 2rem 0;
  }

  .input-row {
    flex-direction: column;
    gap: 0.75rem;
  }

  .input-row .btn-verify {
    width: 100%;
    justify-content: center;
  }

  .test-did-pills {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .example-meta-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .pipeline-grid {
    grid-template-columns: 1fr;
  }

  .arch-svg-wrap {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .capabilities-grid {
    grid-template-columns: 1fr;
  }

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .code-links-grid {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    margin: 1.5rem auto 0;
    gap: 0.75rem;
  }

  .code-links-grid .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.6rem !important;
  }

  .hero-brand {
    font-size: 1.35rem !important;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .version-tag {
    display: none;
  }

  .main-nav .nav-external {
    display: none;
  }
}