/* ============================================================
   SISO Collapse — Phase 1
   Multiplication as Information Destruction
   Same palette as Happy Ending: dark + ice + gold + orange.
   ============================================================ */

:root {
  --bg:          #080d14;
  --bg-panel:    #0b1018;
  --bg-card:     #0f1620;
  --bg-hi:       #162030;
  --bg-glass:    rgba(15,22,32,0.85);
  --border:      #1e3448;
  --border-hi:   #2a4a65;
  --text:        #c2d4e8;
  --text-dim:    #7490aa;
  --text-muted:  #5a7890;
  --cyan:        #18d6e0;
  --cyan-dim:    rgba(24,214,224,0.12);
  --orange:      #e07818;
  --orange-dim:  rgba(224,120,24,0.08);
  --green:       #2ecc8a;
  --gold:        #f5c842;
  --gold-dim:    rgba(245,200,66,0.10);
  --red:         #e04848;
  --red-dim:     rgba(224,72,72,0.10);
  --violet:      #9b7de8;
  --radius:      4px;
  --radius-lg:   7px;
  --t:           0.14s ease;
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { font-size:15px; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */
.layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  grid-template-rows: 100vh;
  height: 100vh;
}

/* ── Canvas ── */
.canvas-area {
  position: relative;
  background: var(--bg);
  overflow: hidden;
  height: 100%;
  min-height: 0;
}

#main-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: block;
}

/* ── Sidebar ── */
.sidebar {
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  height: 100vh;
}

.sidebar-header {
  padding: 1.2rem 1.2rem 0.6rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-title {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.sidebar-tagline {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.4;
}

/* ── Controls ── */
.controls {
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--border);
}

.control-section {
  margin-bottom: 1rem;
}

.control-section:last-child { margin-bottom: 0; }

.control-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  display: block;
}

.input-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.4rem;
}

.input-row input {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.88rem;
  padding: 0.4rem 0.55rem;
  outline: none;
  transition: border-color var(--t);
}

.input-row input:focus {
  border-color: var(--cyan);
}

.input-row .sep {
  color: var(--text-muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.9rem;
  font-weight: 700;
}

button {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.4rem 0.7rem;
  cursor: pointer;
  transition: all var(--t);
  background: var(--bg-card);
  color: var(--text-dim);
}

button:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-dim);
}

button.primary {
  background: rgba(24,214,224,0.08);
  border-color: var(--cyan);
  color: var(--cyan);
}

button.primary:hover {
  background: rgba(24,214,224,0.18);
}

button.demo {
  background: rgba(245,200,66,0.06);
  border-color: var(--gold);
  color: var(--gold);
  width: 100%;
  margin-top: 0.3rem;
}

button.demo:hover {
  background: rgba(245,200,66,0.14);
}

.btn-row {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

/* ── Quick examples ── */
.examples {
  padding: 0.6rem 1.2rem;
  border-bottom: 1px solid var(--border);
}

.example-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  display: block;
}

.example-btns {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.example-btns button {
  font-size: 0.7rem;
  padding: 0.25rem 0.5rem;
}

/* ── Stats panel ── */
.stats {
  padding: 0.8rem 1.2rem;
  border-bottom: 1px solid var(--border);
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.22rem 0;
}

.stat-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.stat-val {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

.stat-val.ok   { color: var(--green); }
.stat-val.fail { color: var(--red); }
.stat-val.warn { color: var(--orange); }

/* ── Fiber list ── */
.fiber-section {
  padding: 0.8rem 1.2rem;
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.fiber-section-title {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

#fiber-list {
  max-height: 200px;
  overflow-y: auto;
}

.fiber-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.22rem 0.4rem;
  border-radius: var(--radius);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--orange);
}

.fiber-row.original {
  background: var(--gold-dim);
  color: var(--gold);
}

.fiber-row.empty {
  color: var(--text-dim);
  font-size: 0.75rem;
}

.fiber-row .pair { flex: 1; }
.fiber-row .bits { color: var(--text-muted); font-size: 0.68rem; }
.fiber-row .tag  { font-size: 0.62rem; color: var(--gold); font-weight: 600; letter-spacing: 1px; text-transform: uppercase; }

/* ── Gate log ── */
.log-section {
  padding: 0.6rem 1.2rem;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.log-title {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

#gate-log {
  flex: 1;
  overflow-y: auto;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  line-height: 1.5;
}

.log-row {
  padding: 0.12rem 0.4rem;
  border-radius: 2px;
  color: var(--text-dim);
}

.log-row.forward   { color: var(--cyan); }
.log-row.reverse   { color: var(--orange); }
.log-row.converge  { color: var(--gold); }
.log-row.violation { color: var(--red); background: var(--red-dim); }
.log-row.collision { color: var(--violet); }
.log-row.warning   { color: var(--orange); }
.log-row.error     { color: var(--red); }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hi); }

/* ── Phase tabs ── */
.phase-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.phase-tabs .tab {
  flex: 1;
  border: none;
  border-radius: 0;
  padding: 0.55rem 0.5rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--bg-panel);
  cursor: pointer;
  transition: all var(--t);
  border-bottom: 2px solid transparent;
}

.phase-tabs .tab:hover {
  color: var(--text-dim);
  background: var(--bg-card);
}

.phase-tabs .tab.active {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: var(--bg-card);
}

.phase-tabs .tab + .tab {
  border-left: 1px solid var(--border);
}

/* ── Phase panels ── */
.phase-panel {
  display: none;
  flex-direction: column;
  overflow-y: auto;
  flex: 1 1 auto;
  min-height: 0;
}

.phase-panel.active {
  display: flex;
}

/* ── Input prefix ── */
.input-prefix {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 65px;
}

/* ── Contrast ledger ── */
#contrast-ledger {
  max-height: 260px;
  overflow-y: auto;
}

.ledger-header {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.ledger-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.18rem 0.4rem;
  border-radius: var(--radius);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
}

.ledger-row.collatz { color: var(--cyan); }
.ledger-row.multiply { color: var(--orange); }

.ledger-row .pred-val { flex: 1; }
.ledger-row .pred-rule {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.ledger-row.collatz .pred-rule { color: var(--green); }
.ledger-row.multiply .pred-rule { color: var(--red); }

.ledger-note {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  padding: 0.3rem 0.4rem;
  margin-top: 0.3rem;
  border-radius: var(--radius);
}

.ledger-note.ok {
  color: var(--green);
  background: rgba(46,204,138,0.06);
}

.ledger-note.fail {
  color: var(--red);
  background: var(--red-dim);
}

/* ── Phase 3: Deficit display ── */
#deficit-display {
  max-height: 160px;
  overflow-y: auto;
}

.deficit-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0.4rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--text);
}

.deficit-row.deficit {
  border-top: 1px solid var(--border);
  margin-top: 0.2rem;
  padding-top: 0.35rem;
}

.deficit-label {
  color: var(--text-dim);
  font-size: 0.72rem;
}

.deficit-val {
  font-weight: 600;
}

.deficit-val.zero {
  color: var(--red);
  font-weight: 700;
}

#fiber-detail {
  max-height: 150px;
  overflow-y: auto;
}