/* ============================================
   EUDI4Cardano — Design System CSS
   Based on design.md guidelines
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Primary palette */
  --color-midnight-navy:     #081B3A;
  --color-protocol-blue:     #123C8C;
  --color-identity-blue:     #1E63D6;
  --color-verification-cyan: #35B6E8;
  --color-soft-ice:          #DCEBFA;
  --color-white:             #FFFFFF;

  /* Secondary accents */
  --color-indigo-signal: #4E4BCF;
  --color-teal-link:     #20C6C7;
  --color-eu-gold:       #C7A64A;
  --color-error:         #c94b63;

  /* Neutral palette */
  --color-graphite-900: #0F1726;
  --color-slate-700:    #42526B;
  --color-slate-400:    #97A6BA;
  --color-surface-100:  #F4F7FB;
  --color-surface-200:  #E8EEF6;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Spacing scale */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* --- Dark mode (default — developer-facing surface) --- */
:root {
  --bg-primary:    var(--color-midnight-navy);
  --bg-card:       rgba(18, 60, 140, 0.12);
  --bg-input:      rgba(8, 27, 58, 0.7);

  --text-primary:   var(--color-white);
  --text-secondary: var(--color-soft-ice);
  --text-muted:     var(--color-slate-400);
  --text-subtle:    rgba(220, 235, 250, 0.82);

  --border-color: rgba(53, 182, 232, 0.14);
  --border-focus: rgba(30, 99, 214, 0.5);
  --border-hover: rgba(53, 182, 232, 0.32);
  --proof-json-border: rgba(53, 182, 232, 0.14);
  --dot-pattern-color: rgba(53, 182, 232, 0.055);

  --accent-primary:   var(--color-identity-blue);
  --accent-secondary: var(--color-verification-cyan);

  --shadow-card:   0 4px 32px rgba(8, 27, 58, 0.7), 0 1px 4px rgba(0, 0, 0, 0.3);
  --shadow-button: 0 2px 12px rgba(30, 99, 214, 0.4);

  --gradient-bg:   linear-gradient(150deg, #081B3A 0%, #0C2450 55%, #0F1726 100%);
  --gradient-hero: radial-gradient(ellipse at 65% -10%, rgba(18, 60, 140, 0.45) 0%, transparent 65%);
  --header-bg:     rgba(8, 27, 58, 0.88);
}

/* --- Light mode --- */
:root[data-theme="light"] {
  --bg-primary: var(--color-surface-100);
  --bg-card:    rgba(255, 255, 255, 0.85);
  --bg-input:   var(--color-white);

  --text-primary:   var(--color-midnight-navy);
  --text-secondary: var(--color-protocol-blue);
  --text-muted:     var(--color-slate-700);
  --text-subtle:    rgba(18, 60, 140, 0.8);

  --border-color: var(--color-surface-200);
  --border-focus: rgba(30, 99, 214, 0.35);
  --border-hover: var(--color-identity-blue);
  --proof-json-border: rgba(18, 60, 140, 0.2);
  --dot-pattern-color: rgba(18, 60, 140, 0.08);

  --accent-primary:   var(--color-identity-blue);
  --accent-secondary: var(--color-protocol-blue);

  --shadow-card:   0 2px 20px rgba(8, 27, 58, 0.07), 0 1px 4px rgba(0, 0, 0, 0.05);
  --shadow-button: 0 2px 8px rgba(30, 99, 214, 0.25);

  --gradient-bg:   linear-gradient(150deg, #F4F7FB 0%, #FFFFFF 55%, #E8EEF6 100%);
  --gradient-hero: radial-gradient(ellipse at 65% -10%, rgba(220, 235, 250, 0.9) 0%, transparent 65%);
  --header-bg:     rgba(244, 247, 251, 0.92);
}

/* ============================================
   Reset & Base
   ============================================ */

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

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

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

/* Subtle dot-matrix background — protocol grid motif */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, var(--dot-pattern-color) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--accent-secondary);
  text-decoration: none;
}

/* ============================================
   Layout
   ============================================ */

.container {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  position: relative;
  z-index: 1;
}

main {
  flex: 1;
}

/* ============================================
   Header
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-4) 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
  min-height: 52px;
}

.brand-logo {
  display: block;
  width: auto;
  height: 52px;
  max-width: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.brand-logo-dark {
  display: none;
  height: 52px;
}

:root[data-theme="dark"] .brand-logo-light,
:root:not([data-theme]) .brand-logo-light {
  display: none;
}

:root[data-theme="dark"] .brand-logo-dark,
:root:not([data-theme]) .brand-logo-dark {
  display: block;
}

:root[data-theme="light"] .brand-logo-light {
  display: block;
}

:root[data-theme="light"] .brand-logo-dark {
  display: none;
}

.theme-toggle {
  appearance: none;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  border-radius: 999px;
  padding: 0.625rem 0.875rem;
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  box-shadow: var(--shadow-card);
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  color: var(--accent-secondary);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.theme-toggle:active {
  transform: translateY(1px);
}

.theme-toggle-label {
  display: inline-block;
  min-width: 5.5rem;
  text-align: center;
}

.brand-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.site-nav a {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-nav a:hover {
  color: var(--accent-secondary);
}

/* ============================================
   Hero
   ============================================ */

.hero {
  padding: var(--space-20) 0 var(--space-12);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-verification-cyan);
  background: rgba(53, 182, 232, 0.07);
  border: 1px solid rgba(53, 182, 232, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  margin-bottom: var(--space-6);
}

.hero-badge-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-verification-cyan);
  animation: badge-pulse 2.4s ease infinite;
  flex-shrink: 0;
}

@keyframes badge-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.45; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(1.75rem, 4vw, 2.625rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: var(--space-5);
}

.hero-title em {
  font-style: normal;
  color: var(--color-verification-cyan);
}

.hero-description {
  font-size: 1rem;
  color: var(--text-subtle);
  line-height: 1.75;
  max-width: 560px;
}

/* ============================================
   Flow Section & Cards
   ============================================ */

.flow-section {
  padding-bottom: var(--space-24);
}

.flow-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-10);
  margin-bottom: var(--space-5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-base);
}

.flow-card:hover {
  border-color: var(--border-hover);
}

.step-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-verification-cyan);
  margin-bottom: var(--space-3);
  display: block;
}

.flow-card h2 {
  font-size: 1.3125rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.step-description {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

/* ============================================
   Form
   ============================================ */

.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input.mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.015em;
}

.form-input::placeholder {
  color: var(--color-slate-400);
  opacity: 0.55;
}

.form-input:focus {
  border-color: var(--color-identity-blue);
  box-shadow: 0 0 0 3px var(--border-focus);
}

.form-error {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: var(--color-error);
}

.form-checkbox-container {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
  font-size: 0.9375rem;
  line-height: 1.4;
  color: var(--text-primary);
}

.form-checkbox {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.form-checkbox-checkmark {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  margin-top: 1px;
}

.form-checkbox-checkmark::after {
  content: '';
  width: 10px;
  height: 6px;
  border: 2px solid transparent;
  border-top: none;
  border-right: none;
  transform: rotate(-45deg) translate(-1px, -1px);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.form-checkbox:checked + .form-checkbox-checkmark {
  background: var(--color-identity-blue);
  border-color: var(--color-identity-blue);
}

.form-checkbox:checked + .form-checkbox-checkmark::after {
  border-color: var(--color-white);
  opacity: 1;
}

.form-checkbox:focus + .form-checkbox-checkmark {
  border-color: var(--color-identity-blue);
  box-shadow: 0 0 0 3px var(--border-focus);
}

.form-checkbox-label {
  font-weight: 500;
  color: var(--text-primary);
}

.form-help-text {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.6875rem var(--space-6);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              transform var(--transition-fast),
              opacity var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-identity-blue);
  color: var(--color-white);
  border-color: var(--color-identity-blue);
  box-shadow: var(--shadow-button);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-protocol-blue);
  border-color: var(--color-protocol-blue);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(30, 99, 214, 0.5);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-button);
}

.btn-primary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

:is(.btn, .btn-copy-proof, .form-input, .site-nav a, .footer-links a):focus-visible {
  outline: 2px solid var(--accent-secondary);
  outline-offset: 3px;
}

.btn-outline {
  background: transparent;
  color: var(--color-verification-cyan);
  border-color: rgba(53, 182, 232, 0.35);
}

.btn-outline:hover {
  background: rgba(53, 182, 232, 0.07);
  border-color: var(--color-verification-cyan);
  color: var(--color-verification-cyan);
}

/* Loading spinner */
.btn-loader {
  display: none;
  width: 13px;
  height: 13px;
  border: 2px solid rgba(255, 255, 255, 0.28);
  border-top-color: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
  flex-shrink: 0;
}

.btn.is-loading .btn-text {
  opacity: 0.65;
}

.btn.is-loading .btn-loader {
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   QR Section
   ============================================ */

.qr-section {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-8);
}

.qr-container {
  background: var(--color-white);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  display: inline-block;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.22);
  line-height: 0; /* remove ghost gap below canvas */
}

.qr-fallback-message {
  max-width: 18rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-midnight-navy);
  text-align: center;
}

.wallet-link-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.link-separator {
  font-size: 0.8125rem;
  color: var(--text-muted);
  opacity: 0.7;
  flex-shrink: 0;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  border-top: 1px solid var(--border-color);
  padding: var(--space-10) 0 var(--space-8);
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.footer-icon {
  height: 24px;
  width: auto;
  border-radius: 3px;
}

.footer-tagline {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-style: italic;
  opacity: 0.75;
}

.footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-1) var(--space-5);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-divider {
  color: var(--border-color);
  font-size: 0.75rem;
  user-select: none;
}

.footer-legal {
  font-size: 0.6875rem;
  color: var(--text-muted);
  opacity: 0.5;
  letter-spacing: 0.01em;
}

/* ============================================
   Step 3 — Queue Status
   ============================================ */

.queue-status {
  margin-bottom: var(--space-6);
}

.queue-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-5);
}

/* Position block — large number */
.queue-position-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.queue-numbers {
  display: flex;
  align-items: baseline;
  gap: 3px;
  line-height: 1;
}

.queue-pos-value {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-verification-cyan);
  letter-spacing: -0.04em;
}

.queue-pos-sep {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--text-muted);
  opacity: 0.5;
  align-self: center;
}

.queue-pos-total {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: -0.02em;
}

.queue-pos-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* Right side: state badge + eta */
.queue-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
  padding-top: var(--space-1);
}

.queue-state-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid;
  transition: color var(--transition-base), background var(--transition-base), border-color var(--transition-base);
}

/* State variants */
.queue-state-badge[data-state="queued"],
.queue-state-badge[data-state="waiting"] {
  color: var(--color-verification-cyan);
  background: rgba(53, 182, 232, 0.07);
  border-color: rgba(53, 182, 232, 0.2);
}

.queue-state-badge[data-state="processing"] {
  color: var(--color-indigo-signal);
  background: rgba(78, 75, 207, 0.1);
  border-color: rgba(78, 75, 207, 0.25);
}

.queue-state-badge[data-state="complete"] {
  color: var(--color-teal-link);
  background: rgba(32, 198, 199, 0.08);
  border-color: rgba(32, 198, 199, 0.22);
}

.queue-state-badge[data-state="error"] {
  color: var(--color-error);
  background: rgba(201, 75, 99, 0.1);
  border-color: rgba(201, 75, 99, 0.28);
}

.queue-state-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

.queue-state-badge[data-state="queued"] .queue-state-dot,
.queue-state-badge[data-state="waiting"] .queue-state-dot {
  animation: badge-pulse 2.4s ease infinite;
}

.queue-state-badge[data-state="processing"] .queue-state-dot {
  animation: badge-pulse 1.1s ease infinite;
}

.queue-eta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  opacity: 0.8;
}

.queue-error {
  margin-top: var(--space-4);
  font-size: 0.875rem;
  color: var(--color-error);
}

/* Progress track */
.queue-progress-track {
  width: 100%;
  height: 3px;
  background: var(--border-color);
  border-radius: 99px;
  overflow: hidden;
}

.queue-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-identity-blue), var(--color-verification-cyan));
  border-radius: 99px;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

/* Shimmer on the progress fill */
.queue-progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.25) 50%, transparent 100%);
  animation: shimmer 1.8s ease infinite;
  background-size: 200% 100%;
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}

/* ============================================
   Step 3 — Proof Result
   ============================================ */

.proof-result {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.proof-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.proof-ready-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-teal-link);
  background: rgba(32, 198, 199, 0.08);
  border: 1px solid rgba(32, 198, 199, 0.22);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
}

.btn-copy-proof {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.btn-copy-proof:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

/* JSON block */
.proof-json-block {
  background: rgba(8, 27, 58, 0.65);
  border: 1px solid var(--proof-json-border);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-5);
  overflow-x: auto;
  overflow-y: auto;
  max-height: 320px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.65;
  color: var(--color-soft-ice);
  white-space: pre;
  scrollbar-width: thin;
  scrollbar-color: var(--proof-json-border) transparent;
}

:root[data-theme="light"] .proof-json-block {
  background: var(--color-graphite-900);
  color: var(--color-soft-ice);
}

.proof-json-block::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

.proof-json-block::-webkit-scrollbar-track {
  background: transparent;
}

.proof-json-block::-webkit-scrollbar-thumb {
  background: var(--proof-json-border);
  border-radius: 99px;
}

/* Transaction actions */
.tx-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 600px) {
  .site-header .container {
    gap: var(--space-4);
  }

  .site-header-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: var(--space-3);
  }

  .brand-logo {
    height: 42px;
  }

  .brand-logo-dark {
    height: 42px;
  }

  .site-nav {
    gap: var(--space-4);
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .site-nav a {
    font-size: 0.75rem;
  }

  .theme-toggle {
    padding: 0.5625rem 0.75rem;
    font-size: 0.75rem;
  }

  .hero {
    padding: var(--space-16) 0 var(--space-8);
  }

  .flow-card {
    padding: var(--space-8) var(--space-6);
  }

  .wallet-link-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .footer-links {
    gap: var(--space-1) var(--space-4);
  }

  .queue-top {
    flex-direction: column;
    gap: var(--space-4);
  }

  .queue-meta {
    align-items: flex-start;
  }

  .queue-pos-value {
    font-size: 2rem;
  }

  .tx-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .tx-actions .btn {
    justify-content: center;
  }
}

@media (max-width: 420px) {
  .brand-name {
    display: none; /* icon only on very small screens */
  }
}