/* TNZX Protocol — Interactive Learn */

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --green: #3fb950;
  --red: #f85149;
  --orange: #d29922;
  --purple: #bc8cff;
  --pink: #f778ba;
  --cyan: #39d2c0;
  --mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.5;
  min-height: 100vh;
  max-width: 620px;
  margin: 0 auto;
}

/* ===== HEADER ===== */
header {
  text-align: center;
  padding: 16px 12px 8px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 18px;
  font-weight: 600;
}

header .subtitle {
  color: var(--accent);
  font-weight: 400;
  font-size: 14px;
}

header .tagline {
  color: var(--text-dim);
  font-size: 11px;
  margin-top: 2px;
}

/* ===== SCENARIO NAV ===== */
#scenario-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.scenario-btn {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--sans);
}

.scenario-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.scenario-btn.active {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  font-weight: 600;
}

.scenario-btn .sc-tag {
  font-size: 10px;
  opacity: 0.7;
  margin-left: 4px;
}

/* ===== STAGE ===== */
#stage {
  position: relative;
  max-width: 600px;
  margin: 10px auto;
  min-height: 280px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

/* Actors row */
#actors-row {
  display: flex;
  justify-content: space-around;
  padding: 12px 16px 0;
  position: relative;
  z-index: 10;
}

.actor {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100px;
  transition: opacity 0.3s;
}

.actor.dimmed { opacity: 0.25; }

.actor-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  border: 3px solid var(--border);
  margin-bottom: 6px;
  transition: border-color 0.3s, box-shadow 0.3s;
  position: relative;
}

.actor.highlight .actor-avatar {
  box-shadow: 0 0 16px rgba(88,166,255,.4);
}

.actor-name {
  font-weight: 600;
  font-size: 13px;
  text-align: center;
}

.actor-role {
  font-size: 10px;
  color: var(--text-dim);
  text-align: center;
}

/* Actor colors */
.actor[data-type="alice"] .actor-avatar { border-color: var(--green); background: rgba(63,185,80,.12); }
.actor[data-type="bob"] .actor-avatar { border-color: var(--purple); background: rgba(188,140,255,.12); }
.actor[data-type="pool"] .actor-avatar { border-color: var(--orange); background: rgba(210,153,34,.12); }
.actor[data-type="extpool"] .actor-avatar { border-color: var(--red); background: rgba(248,81,73,.12); }
.actor[data-type="proxy"] .actor-avatar { border-color: var(--cyan); background: rgba(57,210,192,.12); }
.actor[data-type="dpi"] .actor-avatar { border-color: var(--red); background: rgba(248,81,73,.12); }
.actor[data-type="mgate"] .actor-avatar { border-color: var(--orange); background: rgba(210,153,34,.12); }

.actor.highlight[data-type="alice"] .actor-avatar { border-color: var(--green); }
.actor.highlight[data-type="bob"] .actor-avatar { border-color: var(--purple); }
.actor.highlight[data-type="pool"] .actor-avatar { border-color: var(--orange); }
.actor.highlight[data-type="proxy"] .actor-avatar { border-color: var(--cyan); }

/* Lifelines (vertical dashed lines under actors) */
.actor-lifeline {
  position: absolute;
  top: 64px;
  width: 2px;
  height: calc(100% - 64px);
  background: repeating-linear-gradient(to bottom, var(--border) 0, var(--border) 4px, transparent 4px, transparent 8px);
  z-index: 1;
}

/* ===== MESSAGE LAYER (SVG) ===== */
#message-layer {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
}

/* Animated message arrow */
.msg-arrow {
  stroke-width: 2;
  fill: none;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
}

.msg-arrow.animate {
  animation: drawArrow 0.6s ease forwards;
}

@keyframes drawArrow {
  to { stroke-dashoffset: 0; }
}

.msg-arrowhead {
  opacity: 0;
}

.msg-arrowhead.animate {
  animation: fadeIn 0.3s 0.4s ease forwards;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

/* ===== ANNOTATIONS ===== */
#annotations-layer {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 8;
}

.msg-label {
  position: absolute;
  font-family: var(--mono);
  font-size: 10px;
  padding: 3px 8px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.3s, transform 0.3s;
}

.msg-label.visible {
  opacity: 1;
  transform: translateY(0);
}

.msg-label.data     { background: rgba(88,166,255,.15); color: var(--accent); border: 1px solid rgba(88,166,255,.3); }
.msg-label.encrypt  { background: rgba(188,140,255,.15); color: var(--purple); border: 1px solid rgba(188,140,255,.3); }
.msg-label.ghost    { background: rgba(63,185,80,.15); color: var(--green); border: 1px solid rgba(63,185,80,.3); }
.msg-label.danger   { background: rgba(248,81,73,.15); color: var(--red); border: 1px solid rgba(248,81,73,.3); }
.msg-label.info     { background: rgba(210,153,34,.15); color: var(--orange); border: 1px solid rgba(210,153,34,.3); }
.msg-label.note     { background: rgba(255,255,255,.08); color: var(--text-dim); border: 1px solid rgba(255,255,255,.1); }

/* Step markers on lifelines */
.step-marker {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  z-index: 6;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.3s;
}

.step-marker.visible { opacity: 1; }

/* ===== CONTROLS ===== */
#controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 8px;
  max-width: 600px;
  margin: 0 auto;
}

#controls button {
  padding: 6px 18px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  font-family: var(--sans);
  transition: border-color 0.15s;
}

#controls button:hover:not(:disabled) {
  border-color: var(--accent);
}

#controls button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

#controls button#btn-auto.playing {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

#step-counter {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  min-width: 100px;
  text-align: center;
}

/* ===== INFO PANEL ===== */
#info-panel {
  max-width: 600px;
  margin: 8px auto;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 60px;
}

#info-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--accent);
}

#info-body {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text);
}

#info-detail {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  background: rgba(0,0,0,.3);
  padding: 8px 12px;
  border-radius: 4px;
  white-space: pre-wrap;
  display: none;
}

#info-detail.visible { display: block; }

/* ===== FRAME INSPECTOR ===== */
#frame-inspector {
  max-width: 600px;
  margin: 8px auto;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.inspector-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--orange);
  margin-bottom: 10px;
}

#frame-hex {
  font-family: var(--mono);
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin-bottom: 10px;
}

.hex-byte {
  width: 28px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  font-size: 11px;
  transition: background 0.2s;
}

.hex-byte.magic    { background: rgba(248,81,73,.25); color: var(--red); }
.hex-byte.version  { background: rgba(88,166,255,.25); color: var(--accent); }
.hex-byte.type     { background: rgba(188,140,255,.25); color: var(--purple); }
.hex-byte.msgid    { background: rgba(210,153,34,.25); color: var(--orange); }
.hex-byte.fragidx  { background: rgba(63,185,80,.25); color: var(--green); }
.hex-byte.fragtot  { background: rgba(63,185,80,.15); color: var(--green); }
.hex-byte.paylen   { background: rgba(57,210,192,.25); color: var(--cyan); }
.hex-byte.payload  { background: rgba(255,255,255,.08); color: var(--text-dim); }
.hex-byte.nonce    { background: rgba(248,81,73,.15); color: var(--red); }
.hex-byte.ntime    { background: rgba(210,153,34,.15); color: var(--orange); }
.hex-byte.sentinel { background: rgba(248,81,73,.3); color: var(--red); font-weight: bold; }
.hex-byte.highlight { outline: 2px solid var(--accent); outline-offset: 1px; }

#frame-fields {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px;
  font-size: 11px;
}

.field-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 3px;
  background: rgba(255,255,255,.05);
  font-family: var(--mono);
}

.field-tag .field-color {
  width: 8px;
  height: 8px;
  border-radius: 2px;
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 20px;
  color: var(--text-dim);
  font-size: 12px;
  border-top: 1px solid var(--border);
  margin-top: 30px;
}

footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  #actors-row { padding: 12px 10px 0; }
  .actor { min-width: 60px; }
  .actor-avatar { width: 40px; height: 40px; font-size: 18px; }
  .actor-name { font-size: 11px; }
  .actor-role { font-size: 9px; }
  #info-panel { margin: 8px 10px; }
  #controls { gap: 8px; }
}

/* ===== ANIMATED PULSE ===== */
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 rgba(88,166,255,0); }
  50% { box-shadow: 0 0 20px rgba(88,166,255,.4); }
}

.actor.sending .actor-avatar {
  animation: pulse 0.6s ease;
}