:root {
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #162033;
  --primary: #38bdf8;
  --primary-dark: #0284c7;
  --success: #22c55e;
  --warning: #facc15;
  --danger: #ef4444;
  --text: #f8fafc;
  --muted: #94a3b8;
  --border: rgba(148, 163, 184, 0.22);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.25);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), transparent 34%),
    radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.10), transparent 28%),
    var(--bg);
  color: var(--text);
  font-family: Tahoma, Arial, sans-serif;
  line-height: 1.6;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1520px, 96%);
  margin: 0 auto;
  padding: 24px 0 40px;
}

.hero,
.panel {
  border: 1px solid var(--border);
  background: linear-gradient(145deg, rgba(17, 24, 39, 0.96), rgba(15, 23, 42, 0.92));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 26px;
  margin-bottom: 22px;
  overflow: hidden;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  inset-inline-end: -80px;
  top: -80px;
  width: 220px;
  height: 220px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.1);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.04em;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

.hero h1 {
  margin-bottom: 2px;
  font-size: clamp(30px, 4vw, 54px);
}

.hero h2 {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: clamp(18px, 2.2vw, 28px);
}

.hero-text {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
}

.hero-badge {
  width: 132px;
  height: 132px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(34, 197, 94, 0.2));
  border: 1px solid var(--border);
  z-index: 1;
}

.hero-badge span {
  display: block;
  font-size: 48px;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}

.hero-badge small {
  color: var(--muted);
}

.main-layout {
  display: grid;
  grid-template-columns: 360px minmax(420px, 1fr) 330px;
  gap: 18px;
  align-items: stretch;
}

.panel {
  padding: 18px;
}

.panel-header,
.details-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.panel-header h3,
.details-header h3 {
  margin: 0;
}

.status-pill,
.step-meta span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}

.status-pill.done,
.step-meta .done {
  color: var(--success);
  background: rgba(34, 197, 94, 0.12);
  border-color: rgba(34, 197, 94, 0.35);
}

.status-pill.error,
.step-meta .error {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.35);
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.field.full {
  margin-bottom: 12px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid var(--border);
  color: var(--text);
  background: rgba(15, 23, 42, 0.85);
  border-radius: 14px;
  padding: 11px 12px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field textarea {
  resize: vertical;
  min-height: 94px;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.12);
}

.form-errors {
  display: none;
  margin-bottom: 14px;
  padding: 12px;
  border-radius: 14px;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fecaca;
}

.form-errors.show {
  display: block;
}

.toggles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 16px 0;
}

.toggles label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.toggles input {
  accent-color: var(--primary);
}

.button-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.btn,
.speed-btn {
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  background: rgba(30, 41, 59, 0.85);
  padding: 11px 14px;
  font-weight: 800;
  transition: transform 0.18s, border-color 0.18s, background 0.18s;
}

.btn:hover,
.speed-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(56, 189, 248, 0.6);
}

.btn.primary,
.speed-btn.active {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  border-color: transparent;
  color: #00111d;
}

.btn.danger {
  background: rgba(239, 68, 68, 0.16);
  border-color: rgba(239, 68, 68, 0.35);
  color: #fecaca;
}

.btn.small {
  padding: 8px 12px;
  font-size: 13px;
}

.speed-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.network-stage {
  min-height: 360px;
  display: grid;
  grid-template-columns: 120px minmax(220px, 1fr) 120px;
  gap: 16px;
  align-items: center;
}

.device {
  display: grid;
  place-items: center;
  gap: 6px;
  min-height: 160px;
  border-radius: 22px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.78);
  text-align: center;
}

.device-icon {
  font-size: 48px;
}

.device small {
  color: var(--muted);
  direction: ltr;
}

.route-line {
  position: relative;
  height: 180px;
  border-radius: 24px;
  border: 1px dashed rgba(56, 189, 248, 0.35);
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.08), rgba(34, 197, 94, 0.08));
  overflow: hidden;
}

.route-line::before {
  content: "";
  position: absolute;
  inset-inline: 28px;
  top: 50%;
  border-top: 2px dashed rgba(148, 163, 184, 0.38);
}

.route-nodes {
  position: absolute;
  inset-inline: 18px;
  top: 18px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  z-index: 3;
}

.route-node {
  text-align: center;
  padding: 7px 6px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  color: var(--muted);
  border: 1px solid var(--border);
  font-size: 12px;
}

.route-node.active {
  color: var(--primary);
  border-color: rgba(56, 189, 248, 0.55);
}

.packet-token {
  position: absolute;
  top: 50%;
  right: 7%;
  transform: translateY(-50%);
  width: 82px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--primary);
  color: #00111d;
  font-weight: 900;
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.45);
  transition: right 0.55s ease, left 0.55s ease, background 0.25s;
  z-index: 5;
}

.packet-token.error {
  background: var(--danger);
  color: white;
  animation: pulseError 0.55s ease-in-out 3;
}

.packet-token.success {
  background: var(--success);
}

@keyframes pulseError {
  0%, 100% { transform: translateY(-50%) scale(1); }
  50% { transform: translateY(-50%) scale(1.08); }
}

.bits-stream {
  position: absolute;
  inset-inline: 20px;
  bottom: 28px;
  min-height: 26px;
  color: var(--primary);
  font-family: Consolas, monospace;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  opacity: 0.9;
}

.bits-stream.moving::before {
  content: "01001000 01100101 01101100 01101100 01101111 00101110 01001111 01010011 01001001";
  position: absolute;
  animation: bitsMove 4s linear infinite;
}

@keyframes bitsMove {
  from { transform: translateX(100%); }
  to { transform: translateX(-100%); }
}

.mini-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.mini-stats div,
.summary-grid div {
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.65);
  border-radius: 16px;
  padding: 14px;
}

.mini-stats span,
.summary-grid strong {
  display: block;
  font-size: 22px;
  font-weight: 900;
  color: var(--text);
}

.mini-stats small,
.summary-grid small {
  color: var(--muted);
}

.layers-list {
  display: grid;
  gap: 10px;
}

.layer-card {
  display: grid;
  grid-template-columns: 46px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 12px;
  border-radius: 17px;
  background: rgba(15, 23, 42, 0.68);
  border: 1px solid var(--border);
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}

.layer-card.active {
  border-color: rgba(56, 189, 248, 0.7);
  background: rgba(56, 189, 248, 0.13);
  transform: translateX(-4px);
}

.layer-card.done {
  border-color: rgba(34, 197, 94, 0.42);
}

.layer-card.error {
  border-color: rgba(239, 68, 68, 0.55);
  background: rgba(239, 68, 68, 0.11);
}

.layer-num {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary);
  font-weight: 900;
}

.layer-title strong,
.layer-title small {
  display: block;
}

.layer-title small {
  color: var(--muted);
}

.layer-state {
  color: var(--muted);
  font-size: 12px;
}

.details-panel,
.timeline-panel,
.summary-panel,
.quiz-panel {
  margin-top: 18px;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.data-card {
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.68);
  padding: 14px;
  min-width: 0;
}

.data-card h4,
.explanation-box h4 {
  margin-bottom: 10px;
  color: var(--primary);
}

pre {
  margin: 0;
  max-height: 180px;
  overflow: auto;
  direction: ltr;
  text-align: left;
  white-space: pre-wrap;
  word-break: break-word;
  color: #dbeafe;
  font-family: Consolas, Monaco, monospace;
  font-size: 13px;
}

pre.expanded {
  max-height: 520px;
}

.explanation-box {
  margin-top: 14px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.68);
  padding: 15px;
}

.explanation-box p {
  color: var(--muted);
  margin-bottom: 0;
}

.learning-text {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  color: #bae6fd !important;
}

#toggleFullDataBtn {
  margin-top: 12px;
}

.timeline {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.timeline-item {
  min-width: 150px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.72);
  border-radius: 16px;
  padding: 12px;
  color: var(--muted);
  text-align: right;
}

.timeline-item.active {
  border-color: rgba(56, 189, 248, 0.7);
  color: var(--text);
  background: rgba(56, 189, 248, 0.13);
}

.timeline-item.done {
  border-color: rgba(34, 197, 94, 0.45);
}

.timeline-item.error {
  border-color: rgba(239, 68, 68, 0.55);
}

.timeline-item strong,
.timeline-item small {
  display: block;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.quiz-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 14px;
}

.quiz-question {
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.72);
  border-radius: 18px;
  padding: 14px;
}

.quiz-question p {
  font-weight: 800;
  margin-bottom: 10px;
}

.quiz-question label {
  display: block;
  padding: 8px 0;
  color: var(--muted);
}

.quiz-question.correct {
  border-color: rgba(34, 197, 94, 0.55);
}

.quiz-question.wrong {
  border-color: rgba(239, 68, 68, 0.55);
}

@media (max-width: 1180px) {
  .main-layout {
    grid-template-columns: 1fr 1fr;
  }

  .visual-panel {
    order: 3;
    grid-column: 1 / -1;
  }

  .details-grid,
  .summary-grid,
  .quiz-container {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .app-shell {
    width: 94%;
    padding-top: 14px;
  }

  .hero {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-badge {
    width: 96px;
    height: 96px;
  }

  .main-layout,
  .details-grid,
  .summary-grid,
  .quiz-container,
  .field-grid {
    grid-template-columns: 1fr;
  }

  .network-stage {
    grid-template-columns: 1fr;
  }

  .route-line {
    min-height: 180px;
  }

  .mini-stats,
  .button-grid,
  .toggles {
    grid-template-columns: 1fr 1fr;
  }

  .speed-row {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    min-width: 170px;
  }
}

@media (max-width: 480px) {
  .mini-stats,
  .button-grid,
  .toggles {
    grid-template-columns: 1fr;
  }
}

bdi {
  direction: ltr;
  unicode-bidi: isolate;
}

.btn,
.speed-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  text-align: center;
}

.btn small,
.speed-btn small {
  color: inherit;
  opacity: 0.76;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.1;
}

.quick-summary {
  margin-top: 16px;
  border: 1px solid rgba(56, 189, 248, 0.25);
  background: rgba(15, 23, 42, 0.68);
  border-radius: 18px;
  padding: 14px;
}

.quick-summary-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
}

.quick-summary-header h4 {
  margin: 0;
  color: var(--primary);
}

.quick-summary-header span {
  color: var(--muted);
  font-size: 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 9px;
  white-space: nowrap;
}

.quick-summary-list {
  display: grid;
  gap: 8px;
}

.quick-summary-row {
  display: grid;
  grid-template-columns: 34px minmax(120px, 170px) 1fr auto;
  gap: 9px;
  align-items: center;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(17, 24, 39, 0.82);
}

.quick-summary-row.active {
  border-color: rgba(56, 189, 248, 0.8);
  background: rgba(56, 189, 248, 0.12);
}

.quick-summary-number {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: #00111d;
  background: var(--primary);
  font-weight: 900;
}

.quick-summary-layer strong,
.quick-summary-layer small {
  display: block;
}

.quick-summary-layer small,
.quick-summary-action {
  color: var(--muted);
  font-size: 12px;
}

.quick-summary-action {
  line-height: 1.45;
}

.quick-summary-icon {
  font-size: 20px;
}

.quick-summary-footer {
  margin: 10px 0 0;
  color: #bae6fd;
  font-size: 13px;
}

@media (max-width: 760px) {
  .quick-summary-row {
    grid-template-columns: 34px 1fr auto;
  }

  .quick-summary-action {
    grid-column: 2 / -1;
  }
}