styles.css

/* ==========================================================================
   Asymmetric Cryptography Simulator - Stylesheet
   Palette & Style directly inspired by reference photos:
   - Background: #F9F9F9 (No blurring, no dimmed overlay)
   - Electric Blue Accent: #001CE0
   - Card/Pill Surface: #FFFFFF with soft diffused float shadow
   - Clean, professional typography with zero emojis (except 📋 copy/paste)
   ========================================================================== */

:root {
  --bg-primary: #F9F9F9;
  --bg-card: #FFFFFF;
  --color-blue: #001CE0;
  --color-blue-hover: #0016B8;
  --color-blue-light: #EBF0FF;
  --color-blue-alpha10: rgba(0, 28, 224, 0.08);
  --color-blue-alpha20: rgba(0, 28, 224, 0.16);
  --text-dark: #12141D;
  --text-muted: #6B7280;
  --text-dim: #9CA3AF;
  --border-light: rgba(0, 0, 0, 0.06);
  
  /* Photo 2 Soft Diffused Shadow */
  --pill-shadow: 0 16px 36px -6px rgba(0, 0, 0, 0.08),
                 0 6px 16px -2px rgba(0, 0, 0, 0.03),
                 0 0 0 1px rgba(0, 0, 0, 0.025);
                 
  --card-shadow: 0 20px 45px -8px rgba(0, 0, 0, 0.09),
                 0 8px 20px -3px rgba(0, 0, 0, 0.035),
                 0 0 0 1px rgba(0, 0, 0, 0.025);
                 
  --pill-shadow-active: 0 8px 18px -4px rgba(0, 0, 0, 0.07),
                        0 2px 6px -1px rgba(0, 0, 0, 0.04),
                        0 0 0 1px rgba(0, 0, 0, 0.03);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', Menlo, Monaco, Consolas, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-dark);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  user-select: text;
}

/* Background Subtle Grid Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    radial-gradient(circle at 50% 50%, rgba(0, 28, 224, 0.02) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 0;
}

/* Dynamic SVG Connector Canvas for lines connecting envelopes & characters */
#connector-svg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 30;
}

/* Top App Header */
.app-header {
  position: relative;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 48px;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 16px;
}

.pill-badge {
  background: var(--bg-card);
  color: var(--color-blue);
  box-shadow: var(--pill-shadow);
  border-radius: 9999px;
  padding: 10px 22px;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.2px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(0, 28, 224, 0.06);
}

.pill-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-blue);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.header-title-group h1 {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: -0.4px;
}

.header-title-group p {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Photo 2 Button Style (Pure White Floating Pill with Blue Text) */
.photo2-pill-btn {
  background: var(--bg-card);
  color: var(--color-blue);
  box-shadow: var(--pill-shadow);
  border: 1px solid rgba(0, 0, 0, 0.03);
  border-radius: 9999px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.2px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  outline: none;
  text-decoration: none;
}

.photo2-pill-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px -8px rgba(0, 0, 0, 0.12),
              0 8px 18px -2px rgba(0, 0, 0, 0.05);
  color: var(--color-blue-hover);
}

.photo2-pill-btn:active {
  transform: translateY(1px);
  box-shadow: var(--pill-shadow-active);
}

.photo2-pill-btn.primary {
  background: var(--color-blue);
  color: #FFFFFF;
  border: none;
  box-shadow: 0 16px 36px -6px rgba(0, 28, 224, 0.35),
              0 6px 14px -2px rgba(0, 28, 224, 0.2);
}

.photo2-pill-btn.primary:hover {
  background: var(--color-blue-hover);
  box-shadow: 0 20px 42px -6px rgba(0, 28, 224, 0.42);
}

.photo2-pill-btn.small {
  padding: 8px 18px;
  font-size: 13px;
}

/* Formula Banner */
.formula-pill-banner {
  margin: 6px auto 20px;
  background: #FFFFFF;
  border-radius: 9999px;
  box-shadow: var(--pill-shadow);
  padding: 9px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-dark);
  border: 1px solid rgba(0, 28, 224, 0.06);
  z-index: 10;
  max-width: fit-content;
  cursor: pointer;
  transition: transform 0.2s;
}

.formula-pill-banner:hover {
  transform: translateY(-1px);
}

.formula-tag {
  background: var(--color-blue);
  color: #FFFFFF;
  padding: 3px 10px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.formula-math {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-blue);
  letter-spacing: -0.2px;
}

/* Main Simulator Stage */
.simulator-stage {
  position: relative;
  z-index: 10;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 10px 32px 50px;
}

/* Central Stage Container: Alice (Left), Center Stage (Middle), Bob (Right) */
.characters-stage-container {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: 310px 1fr 310px;
  gap: 36px;
  align-items: flex-start;
  margin-top: 10px;
}

/* Character Card Unit */
.character-unit {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  z-index: 20;
}

/* Pixel Avatar Frame */
.avatar-frame {
  position: relative;
  width: 130px;
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: context-menu;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 6px;
  border-radius: 20px;
}

.avatar-frame:hover {
  transform: translateY(-4px) scale(1.02);
}

.avatar-frame:active {
  transform: scale(0.98);
}

/* The SVG Pixel Art (10x10 Square Grid) */
.pixel-avatar-svg {
  width: 120px;
  height: 120px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  filter: drop-shadow(0 8px 16px rgba(0, 28, 224, 0.18));
  transition: filter 0.25s;
}

.avatar-frame:hover .pixel-avatar-svg {
  filter: drop-shadow(0 12px 24px rgba(0, 28, 224, 0.28));
}

.avatar-halo {
  position: absolute;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 28, 224, 0.08) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s;
}

.avatar-frame:hover .avatar-halo {
  opacity: 1;
}

/* Name under Icon matching Image 1: Bold Blue Font */
.character-name {
  font-size: 26px;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: -0.5px;
  margin-top: 12px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

/* Character Keycard Box (Photo 2 Styling) */
.character-keycard {
  width: 100%;
  background: var(--bg-card);
  border-radius: 28px;
  box-shadow: var(--card-shadow);
  border: 1px solid rgba(0, 0, 0, 0.03);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.25s ease;
}

.character-keycard:hover {
  box-shadow: 0 24px 50px -10px rgba(0, 0, 0, 0.11), 0 0 0 1px rgba(0, 28, 224, 0.06);
}

/* Key Row Display */
.key-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.key-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
}

.key-label-title {
  display: flex;
  align-items: center;
  gap: 6px;
}

.key-badge {
  font-size: 10px;
  font-weight: 800;
  padding: 2px 7px;
  border-radius: 9999px;
  background: var(--color-blue-alpha10);
  color: var(--color-blue);
  font-family: var(--font-mono);
}

.key-field-pill {
  background: #F4F5F8;
  border-radius: 16px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid rgba(0, 0, 0, 0.03);
  position: relative;
}

.key-value-text {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dark);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 190px;
  letter-spacing: -0.2px;
}

.key-value-text.masked {
  letter-spacing: 2px;
  color: var(--color-blue);
  font-weight: 800;
  font-size: 13px;
}

.key-actions-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.key-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.15s;
}

.key-btn:hover {
  background: rgba(0, 28, 224, 0.1);
  color: var(--color-blue);
}

.eye-svg {
  width: 17px;
  height: 17px;
  stroke: var(--text-muted);
  fill: none;
  stroke-width: 2;
  transition: stroke 0.15s;
}

.key-btn:hover .eye-svg {
  stroke: var(--color-blue);
}

/* Card Bottom Action Buttons */
.card-bottom-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 4px;
}

.hint-pill {
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
  font-weight: 500;
  margin-top: 4px;
}

.hint-pill b {
  color: var(--color-blue);
}

/* Receiver Incoming Encrypted Box (Appears directly below receiver card) */
.incoming-container {
  width: 100%;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.incoming-encrypted-card {
  background: #FFFFFF;
  border-radius: 26px;
  box-shadow: var(--card-shadow);
  border: 2px solid var(--color-blue);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: slide-in-down 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slide-in-down {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

.incoming-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 800;
  color: var(--color-blue);
}

.cipher-mini-box {
  background: #0B0E23;
  color: #38EF7D;
  font-family: var(--font-mono);
  font-size: 11px;
  border-radius: 12px;
  padding: 10px 12px;
  word-break: break-all;
  max-height: 70px;
  overflow-y: auto;
  line-height: 1.4;
}

.incoming-card-hint {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

.incoming-card-hint b {
  color: var(--color-blue);
}

.decrypted-result-view {
  background: #F4F6FC;
  border-radius: 16px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid rgba(0, 28, 224, 0.12);
}

.decrypted-result-text {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.4;
}

.decrypted-math-proof {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-blue);
  font-weight: 600;
}

/* ==========================================================================
   Central Interaction Area (Inline, NO Popup, NO Background Blur!)
   ========================================================================== */

.central-stage-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  gap: 20px;
  z-index: 20;
}

/* Wire Lane */
.transmission-lane {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-top: 60px;
  margin-bottom: 10px;
}

.wire-line-track {
  width: 100%;
  height: 2px;
  background: repeating-linear-gradient(90deg, rgba(0, 28, 224, 0.18) 0, rgba(0, 28, 224, 0.18) 6px, transparent 6px, transparent 12px);
  position: relative;
}

.wire-badge {
  background: #FFFFFF;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 6px 18px;
  border-radius: 9999px;
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
  border: 1px solid rgba(0, 0, 0, 0.04);
  margin-top: -14px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.25s ease;
}

.wire-badge.active {
  color: var(--color-blue);
  border-color: rgba(0, 28, 224, 0.25);
  box-shadow: 0 8px 24px rgba(0, 28, 224, 0.14);
}

/* Inline Messaging Stage Container */
.inline-messaging-stage {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  animation: fade-slide-in 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fade-slide-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Photo 2 Styled Box (Pill/Card Floating Shape) */
.photo2-dialog-box {
  background: #FFFFFF;
  border-radius: 32px;
  box-shadow: var(--card-shadow);
  border: 1px solid rgba(0, 0, 0, 0.03);
  padding: 28px 32px;
  width: 100%;
  max-width: 580px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: all 0.25s ease;
}

/* Dynamic Connected Message Icon / Envelope Badge */
.dialog-envelope-badge {
  position: absolute;
  top: -20px;
  left: 32px;
  background: #FFFFFF;
  color: var(--color-blue);
  box-shadow: var(--pill-shadow);
  border-radius: 9999px;
  padding: 7px 18px;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(0, 28, 224, 0.08);
  animation: badge-bob 3s infinite ease-in-out;
}

@keyframes badge-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.dialog-title-group h3 {
  font-size: 19px;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: -0.3px;
}

.dialog-title-group p {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.close-btn {
  background: #F4F5F8;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 16px;
  transition: all 0.2s;
}

.close-btn:hover {
  background: var(--color-blue-alpha10);
  color: var(--color-blue);
}

/* 2 Parts: Message Input & Receiver Public Key Input */
.compose-parts-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.compose-part-card {
  background: #F8F9FC;
  border-radius: 20px;
  padding: 16px 18px;
  border: 1px solid rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.part-label {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.message-textarea {
  width: 100%;
  height: 80px;
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 14px;
  padding: 12px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-dark);
  resize: none;
  outline: none;
  transition: border-color 0.2s;
}

.message-textarea:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px var(--color-blue-alpha10);
}

.quick-chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

.quick-chip {
  background: #FFFFFF;
  border: 1px solid rgba(0, 28, 224, 0.1);
  color: var(--color-blue);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.15s;
}

.quick-chip:hover {
  background: var(--color-blue);
  color: #FFFFFF;
}

/* Part 2: Receiver Public Key Hand Input */
.recipient-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.recipient-input-field {
  flex: 1;
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 14px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dark);
  outline: none;
  transition: border-color 0.2s;
}

.recipient-input-field:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px var(--color-blue-alpha10);
}

.recipient-key-status {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.recipient-key-status.valid {
  color: #128743;
}

.recipient-key-status.error {
  color: #D32F2F;
}

/* Compose Actions: Lock Button */
.compose-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
}

/* Distinct Encrypted Box (Appears after clicking Lock button) */
.encrypted-standalone-box {
  background: #FFFFFF;
  border-radius: 32px;
  box-shadow: var(--card-shadow);
  border: 1px solid rgba(0, 0, 0, 0.03);
  padding: 28px 32px;
  width: 100%;
  max-width: 580px;
  position: relative;
  display: none;
  flex-direction: column;
  gap: 18px;
  animation: box-slide-in 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes box-slide-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.cipher-pill-display {
  background: #0B0E23;
  color: #38EF7D;
  border-radius: 16px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  word-break: break-all;
  max-height: 100px;
  overflow-y: auto;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.cipher-pill-display::-webkit-scrollbar {
  width: 4px;
}
.cipher-pill-display::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
}

.math-proof-banner {
  background: var(--color-blue-alpha10);
  border-radius: 16px;
  padding: 12px 16px;
  font-size: 12px;
  color: var(--color-blue);
  line-height: 1.5;
  border: 1px solid var(--color-blue-alpha20);
}

.math-proof-banner b {
  font-family: var(--font-mono);
  font-weight: 700;
}

/* Flying Envelope Node */
.flying-envelope-node {
  position: fixed;
  z-index: 100;
  width: 44px;
  height: 44px;
  background: #FFFFFF;
  box-shadow: 0 12px 30px rgba(0, 28, 224, 0.3), 0 0 0 2px var(--color-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  pointer-events: none;
  transform: translate(-50%, -50%);
  transition: transform 0.05s linear;
}

/* Context Menu */
.custom-context-menu {
  position: fixed;
  background: #FFFFFF;
  border-radius: 20px;
  box-shadow: 0 20px 45px -6px rgba(0, 0, 0, 0.15),
              0 0 0 1px rgba(0, 0, 0, 0.04);
  padding: 8px;
  min-width: 220px;
  z-index: 1000;
  display: none;
  flex-direction: column;
  gap: 4px;
  animation: context-menu-pop 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes context-menu-pop {
  from { opacity: 0; transform: scale(0.92); }
  to { opacity: 1; transform: scale(1); }
}

.context-menu-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-radius: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dark);
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}

.context-menu-item:hover {
  background: var(--color-blue-alpha10);
  color: var(--color-blue);
  transform: translateX(2px);
}

.context-menu-item.primary-action {
  color: var(--color-blue);
  font-weight: 700;
}

.context-menu-divider {
  height: 1px;
  background: rgba(0, 0, 0, 0.05);
  margin: 4px 6px;
}

/* Math Explanation Dialog (Clean Floating Panel, NO Background Blur) */
.math-drawer-panel {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.96);
  background: #FFFFFF;
  border-radius: 32px;
  box-shadow: 0 30px 70px -10px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(0, 0, 0, 0.05);
  padding: 30px 36px;
  max-width: 680px;
  width: 90%;
  max-height: 85vh;
  z-index: 2000;
  display: none;
  flex-direction: column;
  gap: 18px;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.math-drawer-panel.active {
  display: flex;
  transform: translate(-50%, -50%) scale(1);
}

.math-drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.2);
  z-index: 1999;
  display: none;
}

.math-drawer-backdrop.active {
  display: block;
}

.math-modal-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: 60vh;
  overflow-y: auto;
  padding-right: 6px;
}

.math-step-card {
  background: #F8F9FD;
  border-radius: 18px;
  padding: 16px 20px;
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.math-step-title {
  font-size: 14px;
  font-weight: 800;
  color: var(--color-blue);
  margin-bottom: 6px;
}

.math-step-desc {
  font-size: 13px;
  color: var(--text-dark);
  line-height: 1.5;
}

.math-step-formula {
  background: #FFFFFF;
  border-radius: 10px;
  padding: 8px 12px;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-blue);
  border: 1px solid rgba(0, 28, 224, 0.1);
}

/* History Section */
.history-section {
  width: 100%;
  max-width: 960px;
  margin: 40px auto 0;
  background: #FFFFFF;
  border-radius: 28px;
  box-shadow: var(--card-shadow);
  padding: 24px 32px;
  border: 1px solid rgba(0, 0, 0, 0.03);
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.history-header h4 {
  font-size: 16px;
  font-weight: 800;
  color: var(--color-blue);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 240px;
  overflow-y: auto;
}

.history-item {
  background: #F8F9FC;
  border-radius: 16px;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  font-size: 13px;
  border: 1px solid rgba(0, 0, 0, 0.03);
}

.history-sender-badge {
  font-weight: 700;
  color: var(--color-blue);
  display: flex;
  align-items: center;
  gap: 6px;
}

.history-msg-content {
  flex: 1;
  font-weight: 500;
  color: var(--text-dark);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-status-tag {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 9999px;
  background: #E6F8ED;
  color: #128743;
}

/* Floating Toast Alert */
.floating-alert {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(40px);
  background: var(--text-dark);
  color: #FFFFFF;
  padding: 10px 22px;
  border-radius: 9999px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  font-size: 13px;
  font-weight: 600;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

.floating-alert.active {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Responsive adjustments */
@media (max-width: 1060px) {
  .characters-stage-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .character-unit {
    max-width: 360px;
    margin: 0 auto;
  }
  .app-header {
    padding: 16px 20px;
    flex-direction: column;
    gap: 16px;
  }
}

/* ==========================================================================
   Desmos-Style 2D Graph Explorer Styles
   ========================================================================== */

.graph-explorer-stage {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 10px 32px 50px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  animation: fade-in 0.25s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.graph-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  background: #FFFFFF;
  border-radius: 28px;
  box-shadow: var(--pill-shadow);
  padding: 16px 26px;
  border: 1px solid rgba(0, 0, 0, 0.03);
}

.graph-title-group {
  display: flex;
  align-items: center;
  gap: 18px;
}

.graph-title-group h2 {
  font-size: 19px;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: -0.3px;
}

.graph-title-group p {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.graph-viewport-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Grid Layout: Canvas & Sidebar */
.graph-workspace-grid {
  display: grid;
  grid-template-columns: 1fr 430px;
  gap: 24px;
  width: 100%;
  align-items: flex-start;
}

.photo2-card {
  background: #FFFFFF;
  border-radius: 28px;
  box-shadow: var(--card-shadow);
  border: 1px solid rgba(0, 0, 0, 0.03);
}

.graph-canvas-wrapper {
  position: relative;
  height: 640px;
  width: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#desmos-canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}

.graph-cursor-hud {
  position: absolute;
  bottom: 16px;
  left: 20px;
  background: rgba(255, 255, 255, 0.94);
  border-radius: 9999px;
  padding: 7px 16px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.04);
  pointer-events: none;
}

.graph-sidebar-column {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.graph-sidebar-card {
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sidebar-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-card-header h3 {
  font-size: 15px;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: -0.2px;
}

.formula-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-blue);
  background: var(--color-blue-alpha10);
  padding: 4px 10px;
  border-radius: 9999px;
}

/* Sliders */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-dark);
}

.slider-num {
  font-family: var(--font-mono);
  color: var(--color-blue);
  font-weight: 800;
}

.graph-range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: #E5E9F2;
  border-radius: 4px;
  outline: none;
  transition: background 0.15s;
}

.graph-range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-blue);
  box-shadow: 0 3px 8px rgba(0, 28, 224, 0.35);
  cursor: pointer;
  transition: transform 0.15s;
}

.graph-range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.presets-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.discriminant-tag {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  background: #F4F6FC;
  padding: 6px 12px;
  border-radius: 12px;
  text-align: center;
}

/* Stepper Card */
.stepper-count-badge {
  background: #10B981;
  color: #FFFFFF;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.3px;
}

.stepper-info-box {
  background: #F8F9FD;
  border-radius: 16px;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid rgba(0, 0, 0, 0.03);
}

.stepper-info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}

.info-label {
  color: var(--text-muted);
  font-weight: 600;
}

.info-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-blue);
}

.stepper-buttons-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

/* Step Math Breakdown */
.step-math-breakdown {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-dark);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-math-box {
  background: #F4F6FC;
  border-radius: 14px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-blue);
  line-height: 1.4;
  border: 1px solid rgba(0, 28, 224, 0.08);
}

.step-crypto-hint {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
  border-left: 2px solid var(--color-blue);
  padding-left: 10px;
  margin-top: 4px;
}

/* Graph Domain Tabs (Continuous vs Modulo) */
.graph-domain-tabs {
  display: flex;
  background: #F0F3FA;
  padding: 4px;
  border-radius: 9999px;
  gap: 4px;
  border: 1px solid rgba(0, 28, 224, 0.08);
}

.domain-tab-btn {
  flex: 1;
  padding: 8px 14px;
  border-radius: 9999px;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
}

.domain-tab-btn:hover {
  color: var(--color-blue);
}

.domain-tab-btn.active {
  background: #FFFFFF;
  color: var(--color-blue);
  box-shadow: 0 4px 12px rgba(0, 28, 224, 0.12), 0 1px 3px rgba(0, 0, 0, 0.04);
}

@media (max-width: 1150px) {
  .graph-workspace-grid {
    grid-template-columns: 1fr;
  }
  .graph-canvas-wrapper {
    height: 480px;
  }
}

/* ==========================================================================
   Header Navigation Tabs (Photo 2 Floating Pills)
   ========================================================================== */
.nav-tabs-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-tab-btn {
  background: var(--bg-card);
  color: var(--color-blue);
  box-shadow: var(--pill-shadow);
  border: 1px solid rgba(0, 0, 0, 0.03);
  border-radius: 9999px;
  padding: 8px 18px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.2px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  outline: none;
  text-decoration: none;
  white-space: nowrap;
}

.nav-tab-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px -8px rgba(0, 0, 0, 0.12),
              0 8px 18px -2px rgba(0, 0, 0, 0.05);
  color: var(--color-blue-hover);
}

.nav-tab-btn:active {
  transform: translateY(1px);
  box-shadow: var(--pill-shadow-active);
}

.nav-tab-btn.active {
  background: var(--color-blue);
  color: #FFFFFF;
  border: 1px solid var(--color-blue);
  box-shadow: 0 16px 36px -6px rgba(0, 28, 224, 0.35),
              0 6px 14px -2px rgba(0, 28, 224, 0.2);
}

.nav-tab-btn.active:hover {
  background: var(--color-blue-hover);
  box-shadow: 0 20px 42px -6px rgba(0, 28, 224, 0.42);
}

/* ==========================================================================
   Main View 3: Point to Address (P2PKH Game) Styles
   ========================================================================== */
.address-stage {
  max-width: 1140px;
  margin: 0 auto;
  padding: 10px 24px 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.address-stage-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
  padding: 4px 2px;
}

.address-header-left {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.address-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-dark);
  margin: 0;
}

.address-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
}

.address-subtitle code {
  background: #EBF0FF;
  color: var(--color-blue);
  padding: 2px 6px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.address-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Cards Base */
.address-card {
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.address-card-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.address-step-tag {
  background: var(--color-blue-light);
  color: var(--color-blue);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 9999px;
  white-space: nowrap;
  margin-top: 2px;
}

.address-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  margin: 0 0 4px 0;
}

.address-card-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.45;
}

.address-card-desc code {
  background: #F3F4F6;
  color: var(--text-dark);
  padding: 2px 5px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
}

/* Preset Selector Row */
.p2a-preset-selector-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 4px 0;
}

.p2a-selector-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
}

.p2a-preset-pills {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.p2a-preset-btn {
  background: #F3F4F6;
  color: var(--text-dark);
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: 9999px;
  padding: 6px 14px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  outline: none;
}

.p2a-preset-btn:hover {
  background: #EBF0FF;
  color: var(--color-blue);
}

.p2a-preset-btn.active {
  background: var(--color-blue);
  color: #FFFFFF;
  border-color: var(--color-blue);
  box-shadow: 0 4px 12px rgba(0, 28, 224, 0.25);
}

/* Coordinates Grid */
.p2a-coords-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.p2a-coord-box {
  background: #F9FAFC;
  border: 1px solid rgba(0, 28, 224, 0.08);
  border-radius: 18px;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.p2a-coord-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.p2a-coord-name {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.3px;
}

.p2a-copy-icon-btn {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 8px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.15s ease;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.p2a-copy-icon-btn:hover {
  background: var(--color-blue-light);
  color: var(--color-blue);
  border-color: var(--color-blue-alpha20);
  transform: scale(1.05);
}

.p2a-hex-display {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-blue);
  font-weight: 600;
  word-break: break-all;
  letter-spacing: 0.5px;
  line-height: 1.5;
  user-select: all;
}

/* Custom Drawer */
.p2a-custom-drawer {
  background: #FFFFFF;
  border: 1px dashed rgba(0, 28, 224, 0.25);
  border-radius: 16px;
  padding: 16px;
}

.p2a-custom-inputs-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.p2a-custom-field {
  flex: 1;
  min-width: 240px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.p2a-custom-field label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
}

.p2a-input {
  background: #F9FAFB;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dark);
  outline: none;
  transition: border-color 0.2s;
}

.p2a-input:focus {
  border-color: var(--color-blue);
  background: #FFFFFF;
}

/* Parity Callout */
.p2a-parity-callout {
  background: #F0F4FF;
  border-left: 4px solid var(--color-blue);
  border-radius: 0 16px 16px 0;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.p2a-parity-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.p2a-parity-badge {
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.p2a-parity-badge.even {
  background: #001CE0;
  color: #FFFFFF;
}

.p2a-parity-badge.odd {
  background: #D97706;
  color: #FFFFFF;
}

.p2a-parity-details {
  font-size: 13px;
  color: var(--text-dark);
}

.p2a-parity-details code {
  background: #FFFFFF;
  color: var(--color-blue);
  padding: 2px 6px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
}

.p2a-parity-math-explanation {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

.p2a-parity-math-explanation code {
  background: rgba(255, 255, 255, 0.7);
  color: var(--text-dark);
  padding: 1px 4px;
  border-radius: 4px;
  font-family: var(--font-mono);
}

/* Game Wrapper & Step Navigation */
.p2a-game-wrapper {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.p2a-step-nav {
  display: flex;
  align-items: center;
  background: #FFFFFF;
  border-radius: 9999px;
  padding: 6px;
  gap: 6px;
  box-shadow: var(--pill-shadow);
  border: 1px solid rgba(0, 28, 224, 0.08);
  overflow-x: auto;
}

.p2a-nav-pill {
  flex: 1;
  min-width: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  border: none;
  border-radius: 9999px;
  padding: 8px 14px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  outline: none;
}

.p2a-nav-pill:hover {
  background: rgba(0, 28, 224, 0.04);
}

.p2a-nav-pill.active {
  background: var(--color-blue);
  color: #FFFFFF;
  box-shadow: 0 6px 18px rgba(0, 28, 224, 0.3);
}

.p2a-nav-pill.completed:not(.active) {
  background: #EBF0FF;
  color: var(--color-blue);
}

.p2a-nav-num {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.06);
  font-size: 11px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  color: inherit;
}

.p2a-nav-pill.active .p2a-nav-num {
  background: rgba(255, 255, 255, 0.25);
  color: #FFFFFF;
}

.p2a-nav-title {
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

/* Step Card */
.p2a-step-card {
  padding: 26px 30px;
  display: none;
  flex-direction: column;
  gap: 18px;
  animation: fadeIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.p2a-step-card.active {
  display: flex;
}

.p2a-card-header-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.p2a-step-badge {
  background: var(--color-blue);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 9999px;
}

.p2a-step-heading {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.3px;
  color: var(--text-dark);
  margin: 0;
}

.p2a-step-explanation {
  font-size: 14px;
  color: var(--text-dark);
  line-height: 1.55;
  margin: 0;
}

.p2a-step-explanation b {
  color: var(--color-blue);
}

.p2a-step-explanation code {
  background: #EBF0FF;
  color: var(--color-blue);
  padding: 2px 6px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
}

/* Format Selection in Step 1 */
.p2a-format-selection-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.p2a-format-card {
  background: #F9FAFC;
  border: 2px solid rgba(0, 28, 224, 0.08);
  border-radius: 18px;
  padding: 16px 20px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.p2a-format-card:hover {
  border-color: rgba(0, 28, 224, 0.3);
  transform: translateY(-1px);
}

.p2a-format-card.selected {
  background: #FFFFFF;
  border-color: var(--color-blue);
  box-shadow: 0 10px 24px -4px rgba(0, 28, 224, 0.15);
}

.p2a-format-radio-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-dark);
}

.p2a-format-radio-row input[type="radio"] {
  accent-color: var(--color-blue);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.p2a-format-note {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.45;
  margin: 0;
}

.p2a-format-note code {
  background: #EBF0FF;
  color: var(--color-blue);
  padding: 1px 4px;
  border-radius: 4px;
  font-family: var(--font-mono);
}

/* Challenge Box */
.p2a-challenge-box {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: 16px;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.p2a-challenge-question {
  font-size: 13px;
  color: #92400E;
}

.p2a-challenge-question code {
  background: #FEF3C7;
  padding: 2px 6px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
}

.p2a-challenge-options {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.p2a-challenge-btn {
  background: #FFFFFF;
  border: 1px solid #FCD34D;
  border-radius: 9999px;
  padding: 8px 18px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  color: #92400E;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.p2a-challenge-btn:hover {
  background: #FEF3C7;
  transform: translateY(-1px);
}

.p2a-challenge-btn.correct {
  background: #059669;
  color: #FFFFFF;
  border-color: #059669;
}

.p2a-challenge-btn.incorrect {
  background: #DC2626;
  color: #FFFFFF;
  border-color: #DC2626;
}

.p2a-challenge-feedback {
  font-size: 12px;
  font-weight: 600;
  line-height: 1.4;
}

.p2a-challenge-feedback.success {
  color: #065F46;
}

.p2a-challenge-feedback.error {
  color: #991B1B;
}

/* Segmented Hex and Output */
.p2a-output-section {
  background: #F9FAFC;
  border: 1px solid rgba(0, 28, 224, 0.08);
  border-radius: 18px;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.p2a-output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.p2a-output-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dark);
}

.p2a-badge-bytes {
  background: #EBF0FF;
  color: var(--color-blue);
  font-size: 11px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 9999px;
  font-family: var(--font-mono);
}

.p2a-segmented-hex {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  word-break: break-all;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.hex-chip {
  padding: 3px 6px;
  border-radius: 6px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
}

.hex-chip.prefix {
  background: #001CE0;
  color: #FFFFFF;
}

.hex-chip.x-coord {
  background: #E5E7EB;
  color: #1F2937;
}

.hex-chip.y-coord {
  background: #CFFAFE;
  color: #0E7490;
}

.hex-chip.version {
  background: #FEF3C7;
  color: #B45309;
  border: 1px solid #FDE68A;
}

.hex-chip.hash160 {
  background: #EBF0FF;
  color: #001CE0;
}

.hex-chip.checksum {
  background: #D1FAE5;
  color: #047857;
  border: 1px solid #A7F3D0;
}

/* Generators Units */
.p2a-generator-unit {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.p2a-input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.p2a-input-group label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
}

.p2a-input-mono {
  background: #F9FAFC;
  border: 1px solid rgba(0, 28, 224, 0.12);
  border-radius: 12px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-blue);
  outline: none;
  font-weight: 600;
  transition: all 0.2s;
}

.p2a-input-mono:focus {
  background: #FFFFFF;
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(0, 28, 224, 0.08);
}

.p2a-generator-actions {
  display: flex;
  gap: 10px;
}

.p2a-output-group {
  background: #F9FAFC;
  border: 1px solid rgba(0, 28, 224, 0.08);
  border-radius: 16px;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.p2a-hex-box {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-blue);
  font-weight: 700;
  word-break: break-all;
  line-height: 1.5;
  user-select: all;
}

/* Checksum Breakdown Grid */
.p2a-checksum-breakdown-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: #F4F6FC;
  border-radius: 16px;
  padding: 14px 18px;
}

.p2a-cs-substep {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.p2a-cs-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
}

.p2a-cs-val {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dark);
  word-break: break-all;
}

.p2a-cs-substep.highlight {
  background: #FFFFFF;
  border: 1px solid rgba(0, 28, 224, 0.15);
  border-radius: 12px;
  padding: 10px 14px;
}

.checksum-highlight {
  color: #047857;
  font-weight: 800;
  font-size: 13px;
}

/* Final Address Card in Step 6 */
.p2a-final-address-card {
  background: linear-gradient(135deg, #001CE0 0%, #0014A8 100%);
  border-radius: 24px;
  padding: 24px 28px;
  color: #FFFFFF;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 20px 45px -8px rgba(0, 28, 224, 0.35);
  animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.p2a-address-banner-tag {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  opacity: 0.85;
}

.p2a-final-address-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.p2a-final-address-text {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.5px;
  word-break: break-all;
  user-select: all;
}

.p2a-final-address-row .photo2-pill-btn {
  background: #FFFFFF;
  color: var(--color-blue);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.15);
}

.p2a-final-address-row .photo2-pill-btn:hover {
  background: #F0F4FF;
}

.p2a-address-meta-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.p2a-meta-pill {
  background: rgba(255, 255, 255, 0.18);
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 700;
}

.p2a-meta-pill.success {
  background: #10B981;
  color: #FFFFFF;
}

/* Victory Summary Card */
.p2a-victory-card {
  background: #FFFFFF;
  border: 1px solid rgba(0, 28, 224, 0.12);
  border-radius: 20px;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.p2a-victory-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-blue);
  margin: 0;
}

.p2a-victory-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.45;
}

.p2a-summary-table {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: #F9FAFC;
  border-radius: 14px;
  padding: 12px 16px;
}

.p2a-summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 12px;
}

.p2a-sum-col-label {
  font-weight: 700;
  color: var(--text-muted);
}

.p2a-sum-col-val {
  font-family: var(--font-mono);
  color: var(--text-dark);
  font-weight: 600;
  word-break: break-all;
  max-width: 65%;
  text-align: right;
}

.p2a-sum-col-val.highlight {
  color: var(--color-blue);
  font-weight: 800;
}

/* Card Footers */
.p2a-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: 6px;
  padding-top: 14px;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

/* Toolbox Grid */
.p2a-toolbox-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.p2a-tool-card {
  background: #F9FAFC;
  border: 1px solid rgba(0, 28, 224, 0.08);
  border-radius: 20px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.p2a-tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.p2a-tool-header h4 {
  font-size: 14px;
  font-weight: 800;
  color: var(--text-dark);
  margin: 0;
}

.p2a-tool-format-toggle {
  display: flex;
  background: #E5E7EB;
  border-radius: 9999px;
  padding: 2px;
  gap: 2px;
}

.p2a-mode-btn {
  background: transparent;
  border: none;
  border-radius: 9999px;
  padding: 3px 8px;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.p2a-mode-btn.active {
  background: #FFFFFF;
  color: var(--color-blue);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.p2a-tool-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.p2a-tool-textarea {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 12px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  resize: vertical;
  color: var(--text-dark);
  outline: none;
  transition: border-color 0.2s;
}

.p2a-tool-textarea:focus {
  border-color: var(--color-blue);
}

.p2a-tool-output-box {
  background: #FFFFFF;
  border: 1px solid rgba(0, 28, 224, 0.1);
  border-radius: 12px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.p2a-tool-output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
}

.p2a-tool-output-val {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-blue);
  word-break: break-all;
  font-weight: 600;
}

@media (max-width: 950px) {
  .p2a-coords-grid {
    grid-template-columns: 1fr;
  }
  .p2a-format-selection-group {
    grid-template-columns: 1fr;
  }
  .p2a-toolbox-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Main View 4: Merkle Tree Simulator Styles
   ========================================================================== */
.merkle-stage {
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 24px 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.merkle-stage-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
  padding: 4px 2px;
}

.merkle-header-left {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.merkle-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-dark);
  margin: 0;
}

.merkle-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
}

.merkle-mode-pills {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* Merkle Cards */
.merkle-card {
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.merkle-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.merkle-card-header-main {
  flex: 1;
  min-width: 260px;
}

/* Block Header Status Card */
.merkle-block-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.merkle-block-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.merkle-block-tag {
  background: #FEF3C7;
  color: #B45309;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: 9999px;
  display: inline-block;
  width: fit-content;
}

.merkle-block-meta-details {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.merkle-block-meta-details code {
  font-family: var(--font-mono);
  background: #F1F5F9;
  padding: 1px 5px;
  border-radius: 4px;
}

.merkle-root-display-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.merkle-root-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.merkle-root-hash-badge {
  background: #EBF0FF;
  border: 1px solid rgba(0, 28, 224, 0.15);
  border-radius: 9999px;
  padding: 6px 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.merkle-root-hash-badge code {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: 0.5px;
}

/* Status Badges */
.merkle-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.merkle-status-badge.valid {
  background: #ECFDF5;
  color: #065F46;
  border: 1px solid #A7F3D0;
}

.merkle-status-badge.tampered {
  background: #FEF2F2;
  color: #991B1B;
  border: 1px solid #FCA5A5;
  animation: pulseTamper 2s infinite;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.merkle-status-badge.valid .status-dot {
  background: #10B981;
  box-shadow: 0 0 8px #10B981;
}

.merkle-status-badge.tampered .status-dot {
  background: #EF4444;
  box-shadow: 0 0 8px #EF4444;
}

@keyframes pulseTamper {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

/* Tamper Comparison Drawer */
.merkle-tamper-comparison {
  background: #FFF5F5;
  border: 1px solid #FECACA;
  border-radius: 16px;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.merkle-tamper-comparison-content {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  flex: 1;
}

.merkle-comp-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.merkle-comp-title {
  font-size: 11px;
  font-weight: 800;
  color: var(--text-muted);
}

.merkle-comp-hash {
  font-family: var(--font-mono);
  font-size: 11px;
  word-break: break-all;
  padding: 4px 8px;
  border-radius: 6px;
}

.merkle-comp-hash.original {
  background: #ECFDF5;
  color: #065F46;
}

.merkle-comp-hash.computed {
  background: #FEF2F2;
  color: #991B1B;
  font-weight: 700;
}

/* Visual Tree Canvas */
.merkle-builder-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.merkle-tree-wrapper {
  position: relative;
  min-height: 420px;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 30px 16px;
  background: #FAFBFD;
  border: 1px solid rgba(0, 28, 224, 0.06);
  border-radius: 20px;
}

.merkle-connector-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.merkle-tree-nodes-container {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 56px;
  align-items: center;
  min-width: 640px;
}

.merkle-tree-level-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.merkle-level-label-pill {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: #FFFFFF;
  color: var(--text-muted);
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
  border: 1px solid rgba(0,0,0,0.04);
  padding: 4px 12px;
  border-radius: 9999px;
  text-transform: uppercase;
}

.merkle-level-nodes-group {
  display: flex;
  justify-content: space-around;
  align-items: center;
  gap: 20px;
  width: 100%;
  flex-wrap: nowrap;
}

/* Individual Node Card */
.merkle-node-card {
  background: #FFFFFF;
  border: 1px solid rgba(0, 28, 224, 0.08);
  border-radius: 16px;
  padding: 12px 16px;
  min-width: 150px;
  max-width: 220px;
  flex: 1;
  box-shadow: var(--pill-shadow);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.merkle-node-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px -4px rgba(0, 0, 0, 0.12);
}

.merkle-node-card.root-node {
  border: 2px solid var(--color-blue);
  background: linear-gradient(180deg, #FFFFFF 0%, #F5F7FF 100%);
  min-width: 200px;
  max-width: 260px;
}

.merkle-node-card.leaf-node {
  border: 1px solid rgba(0, 28, 224, 0.12);
}

/* Tampered State */
.merkle-node-card.tampered {
  border: 2px solid #EF4444 !important;
  background: #FEF2F2 !important;
  box-shadow: 0 10px 24px -4px rgba(239, 68, 68, 0.25) !important;
}

.merkle-node-card.tampered .merkle-node-tag {
  color: #DC2626 !important;
}

.merkle-node-card.tampered .merkle-node-hash {
  color: #B91C1C !important;
}

/* SPV Quiz States */
.merkle-node-card.spv-target-node {
  border: 2px solid #001CE0 !important;
  background: #FFFFFF !important;
  box-shadow: 0 0 0 3px rgba(0, 28, 224, 0.2), 0 12px 28px rgba(0, 28, 224, 0.25) !important;
}

.merkle-node-card.spv-sibling-node {
  border: 2px dashed #001CE0 !important;
  background: #F0F4FF !important;
  box-shadow: 0 8px 20px rgba(0, 28, 224, 0.15) !important;
}

.merkle-node-card.spv-dimmed {
  opacity: 0.35 !important;
  filter: grayscale(40%);
}

.merkle-node-card.duplicated-node {
  border-style: dashed;
}

/* Node Internal Details */
.merkle-node-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}

.merkle-node-tag {
  font-size: 11px;
  font-weight: 800;
  color: var(--color-blue);
  letter-spacing: 0.3px;
}

.merkle-node-dup-badge {
  background: #F1F5F9;
  color: var(--text-muted);
  font-size: 9px;
  font-weight: 800;
  padding: 2px 5px;
  border-radius: 4px;
}

.merkle-node-tamper-badge {
  background: #EF4444;
  color: #FFFFFF;
  font-size: 9px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 9999px;
  letter-spacing: 0.5px;
}

.merkle-node-spv-badge {
  background: #001CE0;
  color: #FFFFFF;
  font-size: 9px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 9999px;
  letter-spacing: 0.5px;
}

.merkle-node-spv-badge.sibling {
  background: #3B82F6;
}

.merkle-node-hash-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
  cursor: help;
}

.merkle-node-hash {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-dark);
}

.merkle-node-tx-snippet {
  font-size: 10px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-top: 2px;
  border-top: 1px solid rgba(0,0,0,0.04);
}

/* Leaf Transactions Manager */
.merkle-odd-notice {
  display: inline-flex;
  align-items: center;
  background: #FEF3C7;
  color: #92400E;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 9999px;
  margin-top: 6px;
}

.merkle-tx-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.merkle-tx-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 14px;
}

.merkle-tx-item {
  background: #F9FAFC;
  border: 1px solid rgba(0, 28, 224, 0.08);
  border-radius: 16px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all 0.2s;
}

.merkle-tx-item.tampered {
  border-color: #EF4444;
  background: #FEF2F2;
}

.merkle-tx-item.spv-target {
  border-color: #001CE0;
  background: #F0F4FF;
}

.merkle-tx-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.merkle-tx-label {
  font-size: 12px;
  font-weight: 800;
  color: var(--text-dark);
}

.merkle-badge-tampered {
  background: #EF4444;
  color: #FFFFFF;
  font-size: 9px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 9999px;
}

.merkle-badge-spv {
  background: #001CE0;
  color: #FFFFFF;
  font-size: 9px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 9999px;
}

.merkle-tx-hash-badge {
  font-size: 11px;
  color: var(--text-muted);
}

.merkle-tx-hash-badge code {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-blue);
}

.merkle-tx-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.merkle-tx-input {
  flex: 1;
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  padding: 8px 12px;
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-dark);
  outline: none;
  transition: all 0.2s;
}

.merkle-tx-input:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(0, 28, 224, 0.08);
}

.merkle-tx-input.tampered {
  border-color: #EF4444;
  color: #B91C1C;
  font-weight: 600;
}

/* SPV Audit Quiz Card */
.merkle-spv-target-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.merkle-select {
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  padding: 6px 12px;
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-dark);
  outline: none;
  cursor: pointer;
}

.merkle-spv-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.merkle-spv-stat-banner {
  background: #EBF0FF;
  border-left: 4px solid var(--color-blue);
  border-radius: 0 14px 14px 0;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-dark);
}

.merkle-spv-steps-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.merkle-spv-step-item {
  background: #F8FAFC;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 16px;
  padding: 12px 18px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  transition: all 0.2s;
}

.merkle-spv-step-item.completed {
  border-color: #A7F3D0;
  background: #F0FDF4;
}

.merkle-spv-step-item.active {
  border-color: #93C5FD;
  background: #EFF6FF;
}

.merkle-spv-step-item.verified {
  border-color: #10B981;
  background: #ECFDF5;
}

.merkle-spv-step-item.failed {
  border-color: #EF4444;
  background: #FEF2F2;
}

.merkle-spv-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #E2E8F0;
  color: var(--text-dark);
  font-size: 11px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.merkle-spv-step-item.completed .merkle-spv-num {
  background: #10B981;
  color: #FFFFFF;
}

.merkle-spv-step-item.active .merkle-spv-num {
  background: #001CE0;
  color: #FFFFFF;
}

.merkle-spv-desc {
  font-size: 13px;
  color: var(--text-dark);
  line-height: 1.5;
  flex: 1;
}

.merkle-spv-desc code {
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.04);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
}

.spv-result-chip {
  display: inline-block;
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 6px;
  padding: 2px 8px;
  margin-top: 4px;
  font-size: 11px;
  color: var(--color-blue);
  font-weight: 700;
}

.spv-pending-chip {
  display: inline-block;
  background: #F1F5F9;
  border-radius: 6px;
  padding: 2px 8px;
  margin-top: 4px;
  font-size: 11px;
  color: var(--text-muted);
}

.spv-verified-badge {
  display: inline-block;
  background: #10B981;
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 9999px;
  margin-top: 6px;
  letter-spacing: 0.5px;
}

.spv-failed-badge {
  display: inline-block;
  background: #EF4444;
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 9999px;
  margin-top: 6px;
  letter-spacing: 0.5px;
}

.merkle-spv-footer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 8px;
}