:root {
  --cursor-x: 50vw;
  --cursor-y: 20vh;
  --bg: #08111d;
  --bg-alt: #0c1726;
  --surface: #101c2e;
  --surface-alt: #0f1a2a;
  --surface-2: #15243a;
  --surface-hover: #1a2f4b;
  --ink: #f3f7fb;
  --ink-soft: #a0b4cb;
  --ink-faint: #6f87a6;
  --ink-contrast: #06111b;
  --accent: #5ad7ff;
  --accent-strong: #2fb8ea;
  --accent-soft: rgba(90, 215, 255, 0.14);
  --accent-glow: rgba(90, 215, 255, 0.32);
  --violet: #8b7cff;
  --warn: #f2b84b;
  --danger: #ff7a7a;
  --danger-soft: rgba(255, 122, 122, 0.12);
  --ok: #43d39e;
  --ok-soft: rgba(67, 211, 158, 0.12);
  --border: #253a56;
  --border-soft: #17273d;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 8px 22px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
}

body {
  position: relative;
  line-height: 1.65;
}

::selection {
  background: var(--accent-glow);
  color: var(--ink-contrast);
}

.bg-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle 280px at var(--cursor-x) var(--cursor-y), rgba(90, 215, 255, 0.16), transparent 65%),
    radial-gradient(ellipse 900px 500px at 12% -5%, rgba(47, 184, 234, 0.18), transparent 55%),
    radial-gradient(ellipse 800px 500px at 100% 0%, rgba(139, 124, 255, 0.16), transparent 50%),
    radial-gradient(ellipse 700px 500px at 50% 100%, rgba(67, 211, 158, 0.09), transparent 55%),
    linear-gradient(180deg, var(--bg-alt), var(--bg) 40%);
}

.bg-layer::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(155, 180, 203, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155, 180, 203, 0.06) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 70%);
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  width: 100%;
  margin: 0;
  padding: 0.95rem clamp(1rem, 2vw, 1.5rem) 1rem;
  background: rgba(8, 17, 29, 0.9);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-soft);
  border-radius: 0;
  box-shadow: var(--shadow-sm);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--violet), transparent);
  opacity: 0.9;
}

.title-wrap h1 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  background: linear-gradient(120deg, #f6fbff 0%, #bfd7ea 40%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.main-nav {
  margin-top: 0.85rem;
  display: flex;
  flex-wrap: nowrap;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.15rem;
  scrollbar-width: thin;
}

.main-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 500;
  font-size: 0.9rem;
  white-space: nowrap;
  padding: 0.45rem 0.82rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(21, 36, 58, 0.56);
  transition: color 160ms ease, background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.selector-strip {
  margin-top: 0.9rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 0.7rem;
  align-items: stretch;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(21, 36, 58, 0.58), rgba(12, 23, 38, 0.58));
}

.selector-strip label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}

.selector-strip .search-wrap {
  min-width: 220px;
}

.selector-strip .btn {
  min-height: 42px;
  align-self: end;
}

.site-header .playback-controls {
  margin-top: 0.85rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.5rem;
}

.site-header .progress-wrap {
  margin-top: 0.85rem;
  max-width: none;
}

/* ---------- Layout / Panels ---------- */

main {
  padding: 1rem clamp(0.75rem, 2vw, 1.25rem) 2.2rem;
  margin: 0;
  width: 100%;
  display: grid;
  gap: 1rem;
}

.panel {
  position: relative;
  background: linear-gradient(180deg, var(--surface), var(--surface-alt));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.1rem;
  padding: clamp(1.1rem, 2vw, 1.75rem);
  overflow: hidden;
}

.panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--violet));
  opacity: 0.75;
}

.panel h2 {
  margin-top: 0;
  font-size: clamp(1.3rem, 2.1vw, 1.7rem);
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.panel h2::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
  flex-shrink: 0;
}

.panel h3 {
  margin: 1.1rem 0 0.65rem;
  font-size: 1.02rem;
  color: var(--accent);
  letter-spacing: 0.01em;
}

.panel > p,
.panel > div > p {
  color: var(--ink-soft);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.chip {
  padding: 0.36rem 0.72rem;
  border-radius: 999px;
  border: 1px solid rgba(90, 215, 255, 0.35);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  font-family: "IBM Plex Mono", monospace;
}

.placeholder-note {
  margin-top: 1rem;
  border-left: 3px solid var(--warn);
  border-radius: 0 8px 8px 0;
  padding: 0.65rem 0.85rem;
  background: rgba(242, 184, 75, 0.1);
  color: var(--ink-soft);
  font-size: 0.92rem;
}

#domainContextNote {
  margin-top: 0.9rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
  border-top: 1px dashed var(--border);
  padding-top: 0.8rem;
}

.grid-2,
.grid-3 {
  display: grid;
  gap: 0.85rem;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem;
  background: var(--surface-2);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(90, 215, 255, 0.42);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.35);
}

.card h3 {
  margin: 0 0 0.4rem;
  color: var(--ink);
  font-size: 0.98rem;
}

.card p,
.card ul {
  color: var(--ink-soft);
  margin: 0;
  font-size: 0.9rem;
}

.card ul {
  padding-left: 1.1rem;
}

/* ---------- Architecture View ---------- */

.architecture-view {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background:
    radial-gradient(circle at 15% 0%, rgba(34, 211, 238, 0.08), transparent 55%),
    linear-gradient(180deg, var(--surface-2), var(--surface-alt));
  padding: 1rem;
  margin-bottom: 0.9rem;
}

.arch-row {
  display: grid;
  gap: 0.6rem;
}

.arch-row-top {
  grid-template-columns: 0.9fr 1fr 1fr;
}

.arch-row-bottom {
  grid-template-columns: 1fr 1fr;
  margin-top: 0.5rem;
}

.arch-node {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.5rem;
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--surface);
  text-align: center;
  color: var(--ink);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.arch-node:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35);
}

.arch-boot {
  border-left-color: #60a5fa;
  background: linear-gradient(180deg, rgba(96, 165, 250, 0.18), rgba(16, 28, 46, 0.92));
  color: #d8e8ff;
}

.arch-adaptive {
  border-left-color: var(--accent);
  background: linear-gradient(180deg, rgba(90, 215, 255, 0.16), rgba(16, 28, 46, 0.92));
  color: #dcf9ff;
}

.arch-classic {
  border-left-color: var(--ok);
  background: linear-gradient(180deg, rgba(67, 211, 158, 0.15), rgba(16, 28, 46, 0.92));
  color: #ddfef0;
}

.arch-hsm {
  border-left-color: var(--violet);
  background: linear-gradient(180deg, rgba(139, 124, 255, 0.16), rgba(16, 28, 46, 0.92));
  color: #ece7ff;
}

.arch-flash {
  border-left-color: var(--warn);
  background: linear-gradient(180deg, rgba(242, 184, 75, 0.18), rgba(16, 28, 46, 0.92));
  color: #fff0cd;
}

.arch-links,
.arch-footer {
  margin-top: 0.5rem;
  display: grid;
  gap: 0.45rem;
}

.arch-links {
  grid-template-columns: repeat(3, 1fr);
}

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

.arch-links span,
.arch-footer span {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 0.38rem 0.5rem;
  background: rgba(9, 18, 30, 0.58);
  color: var(--ink-faint);
  font-size: 0.78rem;
  font-family: "IBM Plex Mono", monospace;
  text-align: center;
}

.arch-links span:nth-child(1) {
  border-color: rgba(96, 165, 250, 0.45);
  background: linear-gradient(180deg, rgba(96, 165, 250, 0.14), rgba(9, 18, 30, 0.84));
  color: #d8e8ff;
}

.arch-links span:nth-child(2) {
  border-color: rgba(90, 215, 255, 0.45);
  background: linear-gradient(180deg, rgba(90, 215, 255, 0.14), rgba(9, 18, 30, 0.84));
  color: #dcf9ff;
}

.arch-links span:nth-child(3) {
  border-color: rgba(67, 211, 158, 0.45);
  background: linear-gradient(180deg, rgba(67, 211, 158, 0.14), rgba(9, 18, 30, 0.84));
  color: #ddfef0;
}

.arch-footer span:nth-child(1) {
  border-color: rgba(139, 124, 255, 0.45);
  background: linear-gradient(180deg, rgba(139, 124, 255, 0.14), rgba(9, 18, 30, 0.84));
  color: #ece7ff;
}

.arch-footer span:nth-child(2) {
  border-color: rgba(242, 184, 75, 0.5);
  background: linear-gradient(180deg, rgba(242, 184, 75, 0.16), rgba(9, 18, 30, 0.84));
  color: #fff0cd;
}

/* ---------- Lifecycle state machine ---------- */

.state-machine {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
  align-items: center;
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-gutter: stable;
  padding-bottom: 0.1rem;
}

.state {
  flex: 0 0 auto;
  width: max-content;
  max-width: 100%;
  white-space: nowrap;
  border: 1px solid var(--border);
  padding: 0.34rem 0.51rem;
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--ink);
  font-size: 0.75rem;
  font-family: "IBM Plex Mono", monospace;
}

.state-danger {
  border-color: rgba(255, 122, 122, 0.5);
  background: var(--danger-soft);
  color: var(--danger);
}

.state-recover {
  border-color: rgba(67, 211, 158, 0.5);
  background: var(--ok-soft);
  color: var(--ok);
}

.arrow {
  color: var(--ink-faint);
  font-size: 0.75rem;
}

/* ---------- Controls / Toolbar ---------- */

.search-wrap {
  display: flex;
  flex-direction: column;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
  gap: 0.32rem;
}

select,
input[type="search"] {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font: inherit;
  font-size: 0.9rem;
  background: var(--surface);
  color: var(--ink);
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

select:focus,
input[type="search"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

input[type="search"]::placeholder {
  color: var(--ink-faint);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.9rem;
}

.tab {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  background: var(--surface-2);
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 160ms ease;
}

.tab:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.tab.active {
  background: linear-gradient(120deg, var(--accent-strong), var(--violet));
  color: var(--ink-contrast);
  border-color: transparent;
  box-shadow: 0 6px 18px rgba(34, 211, 238, 0.25);
}

/* ---------- Playback layout ---------- */

.playback-layout {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1.85fr) minmax(220px, 0.62fr);
  grid-template-areas: "sequence diagram log";
  gap: 0.95rem;
  height: clamp(560px, 66vh, 760px);
  min-height: 560px;
  align-items: stretch;
}

.sequence-column,
.diagram-column,
.log-column {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.sequence-column {
  grid-area: sequence;
}

.diagram-column {
  grid-area: diagram;
}

.log-column {
  grid-area: log;
  overflow-y: auto;
}

.sequence-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.sequence-list li {
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.6rem;
  border: 1px solid transparent;
  border-left: 3px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  color: var(--ink-soft);
  transition: background 160ms ease, border-color 160ms ease;
}

.sequence-list li:hover {
  background: var(--surface-hover);
}

.sequence-list li strong {
  color: var(--ink);
}

.sequence-list li.active {
  border-left-color: var(--accent);
  border-color: rgba(90, 215, 255, 0.35);
  background: var(--accent-soft);
}

.sequence-list li.filtered {
  display: none;
}

.diagram {
  flex: 1;
  min-height: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(rgba(34, 211, 238, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.045) 1px, transparent 1px),
    var(--bg-alt);
  background-size: 28px 28px, 28px 28px, auto;
  padding: 0.5rem;
  overflow-x: auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.sequence-svg {
  width: max-content;
  min-width: 100%;
  height: auto;
  display: block;
}

.seq-actor {
  fill: var(--surface-2);
  stroke: var(--accent);
  stroke-width: 1.2;
}

.seq-actor-text {
  fill: var(--ink);
  font-size: 13px;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-weight: 600;
}

.seq-lifeline {
  stroke: #35506f;
  stroke-dasharray: 5 5;
  stroke-width: 1;
}

.seq-message-line {
  stroke: #5a7694;
  stroke-width: 1.8;
}

.seq-message-text {
  fill: var(--ink);
  font-size: 11.5px;
  font-weight: 500;
  font-family: "IBM Plex Mono", "Consolas", monospace;
}

.seq-message-bg {
  fill: var(--bg-alt);
  fill-opacity: 0.85;
}

.seq-step-badge {
  fill: var(--surface);
  stroke: #5a7694;
  stroke-width: 1;
}

.seq-step-num {
  fill: var(--ink);
  font-size: 10.5px;
  font-weight: 700;
  font-family: "IBM Plex Mono", "Consolas", monospace;
  text-anchor: middle;
  dominant-baseline: middle;
}

.seq-message.active .seq-message-line {
  stroke: var(--accent);
  stroke-width: 2.6;
  filter: drop-shadow(0 0 4px var(--accent-glow));
}

.seq-message.active .seq-message-text {
  fill: var(--accent);
  font-weight: 700;
}

.seq-message.active .seq-step-badge {
  fill: var(--accent);
  stroke: var(--accent);
}

.seq-message.active .seq-step-num {
  fill: var(--ink-contrast);
  font-weight: 700;
}

.seq-message.muted {
  opacity: 0.2;
}

.diagram-hint {
  margin: 0.55rem 0 0;
  font-size: 0.78rem;
  color: var(--ink-faint);
}

.diagram-events {
  margin-top: 0.6rem;
  flex: 0 0 175px;
  min-height: 0;
  overflow: auto;
}

.diagram-event {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.5rem;
  margin-bottom: 0.35rem;
  background: var(--surface-2);
  color: var(--ink-faint);
  opacity: 0.5;
  transform: translateX(0);
  transition: opacity 220ms ease, transform 220ms ease, border-color 220ms ease, color 220ms ease;
  font-size: 0.84rem;
  font-family: "IBM Plex Mono", monospace;
  line-height: 1.38;
  overflow-wrap: anywhere;
  word-break: break-word;
  text-align: justify;
  text-justify: inter-word;
}

.diagram-event strong {
  color: inherit;
}

.diagram-event.active {
  opacity: 1;
  border-color: var(--accent);
  color: var(--ink);
  transform: translateX(4px);
  background: var(--accent-soft);
}

.diagram-event.filtered {
  display: none;
}

/* ---------- Buttons ---------- */

.playback-controls {
  margin-top: 0.7rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.playback-layout.backend-mode {
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  grid-template-areas: "sequence log";
  height: clamp(560px, 66vh, 760px);
}

.playback-layout.backend-mode .log-column {
  grid-area: log;
  overflow-y: auto;
}

.playback-layout.backend-mode .log-panel {
  min-height: 0;
  overflow: auto;
}

.playback-layout.backend-mode .active-step-card {
  flex: 0 1 auto;
  max-height: 45%;
  overflow: auto;
}

.btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink);
  border-radius: 9px;
  padding: 0.55rem 0.9rem;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease, background 140ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  color: var(--ink-contrast);
  border-color: transparent;
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  box-shadow: 0 8px 20px rgba(34, 211, 238, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 10px 26px rgba(34, 211, 238, 0.4);
}

.btn-secondary {
  border-color: rgba(139, 124, 255, 0.4);
  background: rgba(139, 124, 255, 0.12);
  color: #d1ccff;
}

.progress-wrap {
  margin-top: 0.7rem;
}

.progress {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
  border: 1px solid var(--border);
}

.progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--violet));
  box-shadow: 0 0 10px var(--accent-glow);
  transition: width 220ms ease;
}

.mono {
  font-family: "IBM Plex Mono", "Consolas", monospace;
  color: var(--ink-faint);
}

/* ---------- Active step / logs ---------- */

.active-step-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  background: var(--surface-2);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.step-kicker {
  margin: 0;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.active-step-card h4 {
  margin: 0.4rem 0 0.5rem;
  color: var(--ink);
  font-size: 1.05rem;
}

.active-step-card > p {
  color: var(--ink-soft);
  line-height: 1.5;
  text-align: justify;
  text-justify: inter-word;
}

#activeStepDeepDive {
  line-height: 1.5;
  text-align: justify;
  text-justify: inter-word;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.active-step-card summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

.pseudo {
  margin: 0.5rem 0 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-alt);
  color: #b7f2e0;
  padding: 0.6rem;
  overflow: auto;
  font-size: 0.82rem;
}

.log-panel {
  margin-top: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #08111a;
  color: #8ce6d1;
  flex: 1;
  min-height: 0;
  height: auto;
  max-height: none;
  overflow: auto;
  overflow-x: hidden;
  scrollbar-gutter: stable;
  padding: 0.7rem 0.8rem;
  font-family: "IBM Plex Mono", "Consolas", monospace;
  font-size: 0.83rem;
  position: relative;
}

.log-column .active-step-card {
  flex: 0 0 auto;
}

.log-column .log-panel {
  flex: 1;
  min-height: 0;
}

.log-column .active-step-card {
  flex: 0 0 auto;
}

.log-panel::before {
  content: "● ● ●";
  display: block;
  letter-spacing: 0.3em;
  color: #36506e;
  font-size: 0.7rem;
  margin-bottom: 0.5rem;
}

.log-group + .log-group {
  margin-top: 0.45rem;
  padding-top: 0.35rem;
  border-top: 1px dashed rgba(124, 233, 216, 0.15);
}

.log-step-marker {
  margin: 0 0 0.3rem;
  color: var(--ink-faint);
  opacity: 0.7;
  font-style: italic;
}

.log-line {
  display: flex;
  gap: 0.55rem;
  margin: 0 0 0.32rem;
  opacity: 0;
  transform: translateY(4px);
  animation: rise 220ms ease forwards;
}

.log-time {
  flex-shrink: 0;
  color: var(--ink-faint);
}

.log-line.level-info .log-msg {
  color: #8ce6d1;
}

.log-line.level-security .log-msg {
  color: #cbbcff;
}

.log-line.level-error .log-msg {
  color: #ff9d9d;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Comparison ---------- */

.comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.comparison > div {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  background: var(--surface-2);
}

.comparison > div:first-child {
  border-color: rgba(67, 211, 158, 0.4);
  background: linear-gradient(180deg, var(--ok-soft), var(--surface-2));
}

.comparison > div:last-child {
  border-color: rgba(255, 122, 122, 0.4);
  background: linear-gradient(180deg, var(--danger-soft), var(--surface-2));
}

.comparison h4 {
  margin-top: 0;
  color: var(--ink);
}

.comparison > div:first-child h4::before {
  content: "✓ ";
  color: var(--ok);
}

.comparison > div:last-child h4::before {
  content: "✕ ";
  color: var(--danger);
}

.comparison ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

/* ---------- Accordion ---------- */

.accordion details {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  margin-bottom: 0.55rem;
  background: var(--surface-2);
  transition: border-color 160ms ease;
}

.accordion details[open] {
  border-color: rgba(34, 211, 238, 0.4);
}

.accordion summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 600;
}

.accordion summary::marker {
  color: var(--accent);
}

.accordion p {
  color: var(--ink-soft);
  margin-bottom: 0;
}

/* ---------- Glossary ---------- */

.glossary {
  display: grid;
  gap: 0.5rem;
}

.glossary-item {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 0.5rem 0.6rem;
  background: var(--surface-2);
}

.glossary-item h4 {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink);
}

.glossary-item p {
  margin: 0.25rem 0 0;
  font-size: 0.87rem;
  color: var(--ink-soft);
}

.term {
  border-bottom: 1px dotted var(--accent);
  color: var(--accent);
  cursor: help;
}

/* ---------- Quiz ---------- */

.quiz-wrap {
  display: grid;
  gap: 0.75rem;
}

.quiz-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.8rem;
  background: var(--surface-2);
}

.quiz-item p {
  margin-top: 0;
  color: var(--ink);
  font-weight: 600;
}

.quiz-item label {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--ink-soft);
  cursor: pointer;
}

.quiz-item input {
  margin-right: 0.45rem;
  accent-color: var(--accent);
}

.quiz-result {
  font-weight: 700;
  color: var(--accent);
  font-size: 1rem;
}

/* ---------- Footer ---------- */

.site-footer {
  width: 100%;
  margin: 0;
  padding: 1.2rem clamp(0.9rem, 2vw, 1.2rem) 2rem;
  color: var(--ink-faint);
  text-align: center;
  font-size: 0.85rem;
  border-top: 1px solid var(--border-soft);
}

/* ---------- Reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(10px);
  animation: reveal 460ms ease forwards;
}

.reveal:nth-child(2) {
  animation-delay: 90ms;
}

.reveal:nth-child(3) {
  animation-delay: 150ms;
}

.reveal:nth-child(4) {
  animation-delay: 210ms;
}

.reveal:nth-child(5) {
  animation-delay: 270ms;
}

@keyframes reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Responsive ---------- */

@media (max-width: 1420px) {
  .playback-layout {
    grid-template-columns: minmax(210px, 270px) minmax(0, 1fr);
    grid-template-areas:
      "sequence diagram"
      "log log";
    height: auto;
    min-height: auto;
  }

  .diagram {
    min-height: 360px;
  }

  .log-column {
    min-height: min(50vh, 520px);
  }

  .log-panel {
    min-height: 230px;
    max-height: min(32vh, 320px);
  }
}

@media (max-width: 1180px) {
  .playback-layout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "sequence"
      "diagram"
      "log";
    height: auto;
    min-height: auto;
    max-height: none;
  }

  .selector-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-header {
    width: 100%;
    margin-top: 0;
  }
}

@media (max-width: 840px) {
  .site-header {
    position: relative;
    inset: auto;
    width: 100%;
  }

  main {
    padding-top: 0.55rem;
  }

  .grid-2,
  .grid-3,
  .comparison {
    grid-template-columns: 1fr;
  }

  .selector-strip {
    grid-template-columns: 1fr;
  }

  .arch-row-top,
  .arch-row-bottom,
  .arch-links,
  .arch-footer {
    grid-template-columns: 1fr;
  }

  .main-nav a {
    font-size: 0.85rem;
  }

  .site-header .progress-wrap {
    max-width: none;
  }

  .playback-controls {
    grid-template-columns: 1fr 1fr;
  }
}