/* ── VARIABLES ────────────────────────────────────────── */
:root {
  --bg:          #080c14;
  --bg2:         #0d1320;
  --bg3:         #111827;
  --card:        #0f1623;
  --card-border: #1e2d45;
  --accent:      #00e5ff;
  --accent2:     #7c3aed;
  --green:       #00ff99;
  --orange:      #f97316;
  --red:         #ef4444;
  --text:        #e2e8f0;
  --text2:       #94a3b8;
  --text3:       #475569;
  --radius:      14px;
  --mono:        'JetBrains Mono', monospace;
  --display:     'Syne', sans-serif;
}

/* ── RESET ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── BODY ─────────────────────────────────────────────── */
body {
  font-family: var(--display);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 10% 10%, rgba(0,229,255,0.04) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 90% 90%, rgba(124,58,237,0.05) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ── HEADER ───────────────────────────────────────────── */
.header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--card-border);
  background: rgba(8,12,20,0.9);
  backdrop-filter: blur(12px);
  padding: 1rem 2rem;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.logo-icon {
  font-size: 2rem;
  line-height: 1;
  color: var(--accent);
  filter: drop-shadow(0 0 10px var(--accent));
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--accent), #60a5fa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: 0.72rem;
  color: var(--text3);
  font-family: var(--mono);
  letter-spacing: 0.05em;
  margin-top: 2px;
}

.header-badges { display: flex; gap: 8px; }

.hbadge {
  font-size: 0.7rem;
  font-family: var(--mono);
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid var(--card-border);
  color: var(--text2);
  background: var(--bg3);
}

.hbadge.accent {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,229,255,0.08);
}

/* ── MAIN LAYOUT ──────────────────────────────────────── */
.main {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 1.25rem;
}

/* ── PANELS ───────────────────────────────────────────── */
.panel { display: flex; flex-direction: column; gap: 1.25rem; }

/* ── CARD ─────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,229,255,0.2), transparent);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.card-icon {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(0,229,255,0.1);
  border: 1px solid rgba(0,229,255,0.2);
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.card-header h2 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text2);
  flex: 1;
}

/* ── SETUP ────────────────────────────────────────────── */
.setup-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.setup-row label {
  font-size: 0.8rem;
  color: var(--text2);
  font-family: var(--mono);
}

.stepper {
  display: flex;
  align-items: center;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  overflow: hidden;
}

.step-btn {
  width: 30px;
  height: 34px;
  background: var(--bg3);
  border: none;
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s;
}

.step-btn:hover { background: var(--card-border); }

.stepper input[type="number"] {
  width: 46px;
  height: 34px;
  background: var(--bg2);
  border: none;
  border-left: 1px solid var(--card-border);
  border-right: 1px solid var(--card-border);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 700;
  text-align: center;
  outline: none;
}

.hint {
  margin-top: 0.6rem;
  font-size: 0.72rem;
  color: var(--text3);
  font-family: var(--mono);
}

/* ── BUTTONS ──────────────────────────────────────────── */
.btn-primary {
  height: 34px;
  padding: 0 16px;
  background: linear-gradient(135deg, var(--accent), #3b9eff);
  color: #080c14;
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 700;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0,229,255,0.3);
}

.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  height: 34px;
  padding: 0 16px;
  background: rgba(124,58,237,0.2);
  color: #a78bfa;
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid rgba(124,58,237,0.4);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-secondary:hover {
  background: rgba(124,58,237,0.35);
  box-shadow: 0 4px 14px rgba(124,58,237,0.25);
}

.btn-ghost {
  height: 34px;
  padding: 0 14px;
  background: transparent;
  color: var(--text2);
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-ghost:hover { border-color: var(--text2); color: var(--text); }
.btn-ghost.small { height: 26px; font-size: 0.7rem; padding: 0 10px; }

.btn-danger {
  height: 34px;
  padding: 0 14px;
  background: rgba(239,68,68,0.15);
  color: #fca5a5;
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-danger:hover { background: rgba(239,68,68,0.28); }

/* ── MATRIX TABLE ─────────────────────────────────────── */
.matrix-scroll { overflow: auto; }

table {
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.8rem;
}

th, td {
  width: 38px;
  height: 38px;
  text-align: center;
  border: 1px solid var(--card-border);
}

th {
  background: var(--bg3);
  color: var(--text3);
  font-weight: 600;
  font-size: 0.72rem;
}

td { position: relative; }

td input {
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  outline: none;
  cursor: pointer;
  transition: background 0.15s;
}

td input:focus { background: rgba(0,229,255,0.06); }
td input:hover { background: rgba(255,255,255,0.03); }

td.cell-one {
  background: rgba(0,255,153,0.08);
}
td.cell-one input { color: var(--green); }

td.cell-zero input { color: var(--text3); }

td.cell-diag { background: rgba(0,229,255,0.04); }
td.cell-diag input { color: var(--accent); }

/* Reach matrix cells */
td.reach-one {
  background: rgba(0,255,153,0.12);
  color: var(--green);
  font-weight: 700;
}

td.reach-new {
  background: rgba(0,229,255,0.15);
  color: var(--accent);
  font-weight: 700;
}

td.reach-zero { color: var(--text3); }

/* ── CANVAS CARD ──────────────────────────────────────── */
.canvas-card { flex: 0 0 auto; }

.canvas-wrap {
  position: relative;
  width: 100%;
  border-radius: 10px;
  overflow: hidden;
  background: #050810;
  border: 1px solid var(--card-border);
}

#graphCanvas {
  display: block;
  width: 100%;
  height: auto;
}

/* ── LEGEND ───────────────────────────────────────────── */
.legend {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-left: auto;
  flex-wrap: wrap;
}

.leg-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.7rem;
  color: var(--text2);
  font-family: var(--mono);
}

.leg-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
}

.leg-dot.original  { background: #64748b; }
.leg-dot.discovered { background: var(--green); box-shadow: 0 0 6px var(--green); }
.leg-dot.active    { background: var(--orange); box-shadow: 0 0 6px var(--orange); }

/* ── CONTROLS ─────────────────────────────────────────── */
.controls-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

/* ── STEP INDICATOR ───────────────────────────────────── */
.step-indicator {
  background: var(--bg2);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  margin-bottom: 0.9rem;
}

.step-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-bottom: 0.6rem;
}

.step-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--mono);
}

.step-detail {
  font-size: 0.75rem;
  color: var(--text2);
  font-family: var(--mono);
  min-height: 18px;
}

.progress-bar {
  height: 4px;
  background: var(--card-border);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--green));
  border-radius: 4px;
  width: 0%;
  transition: width 0.4s ease;
}

/* ── TOGGLE ───────────────────────────────────────────── */
.log-toggle { margin-bottom: 0.6rem; }

.toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.78rem;
  color: var(--text2);
  user-select: none;
}

.toggle-label input { display: none; }

.toggle-track {
  width: 34px; height: 18px;
  background: var(--bg3);
  border: 1px solid var(--card-border);
  border-radius: 9px;
  position: relative;
  transition: background 0.2s;
}

.toggle-thumb {
  position: absolute;
  top: 2px; left: 2px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--text3);
  transition: all 0.2s;
}

.toggle-label input:checked + .toggle-track {
  background: rgba(0,229,255,0.2);
  border-color: var(--accent);
}

.toggle-label input:checked + .toggle-track .toggle-thumb {
  left: 18px;
  background: var(--accent);
}

/* ── STEP LOG ─────────────────────────────────────────── */
.step-log {
  display: none;
  background: var(--bg2);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text2);
  max-height: 160px;
  overflow-y: auto;
  line-height: 1.9;
}

.step-log .log-line { padding: 1px 0; transition: color 0.2s; }
.step-log .log-line.log-new { color: var(--green); }
.step-log .log-line.log-k   { color: var(--accent); font-weight: 700; border-top: 1px solid var(--card-border); padding-top: 4px; margin-top: 4px; }

/* ── BADGES ───────────────────────────────────────────── */
#reachBadge .badge {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.badge-yes { background: rgba(0,255,153,0.12); color: var(--green); border: 1px solid rgba(0,255,153,0.25); }
.badge-no  { background: rgba(148,163,184,0.08); color: var(--text3); border: 1px solid var(--card-border); }

/* ── TOOLTIP ──────────────────────────────────────────── */
.global-tooltip {
  position: fixed;
  pointer-events: none;
  background: var(--bg3);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 6px 12px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text);
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.15s;
  max-width: 240px;
  line-height: 1.6;
  white-space: nowrap;
}

.global-tooltip.show { opacity: 1; }

/* ── EMPTY STATE ──────────────────────────────────────── */
.empty-msg {
  font-size: 0.78rem;
  color: var(--text3);
  font-family: var(--mono);
  padding: 0.4rem 0;
}

/* ── SCROLLBAR ────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--card-border); border-radius: 3px; }

/* ── RESPONSIVE ───────────────────────────────────────── */
@media (max-width: 1100px) {
  .main { grid-template-columns: 1fr; }
  .right-panel { order: -1; }
}

@media (max-width: 600px) {
  .header { padding: 0.8rem 1rem; }
  .main { padding: 1rem; }
  .controls-row { gap: 6px; }
  .btn-primary, .btn-secondary, .btn-ghost, .btn-danger { padding: 0 10px; font-size: 0.72rem; }
  .header-badges { display: none; }
}