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

:root {
  --bg:        #08090d;
  --bg2:       #0e1018;
  --surface:   #13151f;
  --border:    rgba(255,255,255,0.07);
  --text:      #e8eaf0;
  --muted:     #6b7280;
  --accent1:   #7c6eff;   /* violet */
  --accent2:   #4fc3f7;   /* cyan */
  --accent3:   #81e0a0;   /* vert */
  --accent4:   #ffb76b;   /* ambre */
  --accent5:   #f472b6;   /* rose */
  --glow1:     rgba(124,110,255,0.35);
  --glow2:     rgba(79,195,247,0.25);
  --radius:    14px;
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.6);
  --font-body: 'Inter', system-ui, sans-serif;
  --font-serif:'Playfair Display', Georgia, serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ─── Background Canvas ─────────────────────────────────────────────── */
#bgCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

/* ─── Header ────────────────────────────────────────────────────────── */
.header {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 36px 24px 12px;
  text-align: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon { font-size: 2rem; filter: drop-shadow(0 0 12px #81e0a0); }

.logo-text {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, var(--accent1), var(--accent2), var(--accent3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ─── Search ────────────────────────────────────────────────────────── */
.search-container {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
  padding: 24px;
  margin-top: 12px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px 6px 6px 24px;
  width: min(560px, 90vw);
  box-shadow: 0 0 0 1px transparent, var(--shadow-lg);
  transition: box-shadow 0.3s, border-color 0.3s;
}

.search-box:focus-within {
  border-color: var(--accent1);
  box-shadow: 0 0 0 3px var(--glow1), var(--shadow-lg);
}

.word-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  caret-color: var(--accent1);
}

.word-input::placeholder { color: var(--muted); font-weight: 300; }

/* Language selector */
.lang-divider {
  width: 1px;
  height: 22px;
  background: var(--border);
  flex-shrink: 0;
  margin: 0 4px;
}

.lang-select {
  background: none;
  border: none;
  outline: none;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.88rem;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
  /* Custom arrow */
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%236b7280' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 4px center;
  padding-right: 20px;
}

.lang-select:hover { color: var(--text); background-color: rgba(255,255,255,0.05); }
.lang-select:focus { color: var(--accent1); }

.lang-select option {
  background: #1a1c28;
  color: var(--text);
  font-size: 0.9rem;
}

.explore-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  border: none;
  border-radius: 44px;
  padding: 12px 22px;
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 0 20px var(--glow1);
  white-space: nowrap;
}

.explore-btn:hover {
  opacity: 0.9;
  transform: scale(1.03);
  box-shadow: 0 0 32px var(--glow1);
}

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

.btn-icon { font-size: 1rem; transition: transform 0.2s; }
.explore-btn:hover .btn-icon { transform: translateX(3px); }

/* Suggestions */
.suggestions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.suggestion-label { font-size: 0.75rem; color: var(--muted); }

.suggestion-chip {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 5px 14px;
  color: var(--muted);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.suggestion-chip:hover {
  background: rgba(124,110,255,0.15);
  border-color: var(--accent1);
  color: var(--accent1);
  transform: translateY(-1px);
}

/* ─── Tree Container ────────────────────────────────────────────────── */
.tree-container {
  position: fixed;
  inset: 0;
  z-index: 5;
  cursor: grab;
  overflow: hidden;
}
.tree-container.panning { cursor: grabbing; }

#treeCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.words-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  transform-origin: 0 0;   /* camera transform anchored at top-left */
  will-change: transform;
}

/* ─── Word Nodes ────────────────────────────────────────────────────── */
.word-node {
  position: absolute;
  transform: translate(-50%, -50%);
  pointer-events: all;
  cursor: grab;
  touch-action: none;
  user-select: none;
  animation: nodeAppear 0.5s cubic-bezier(0.34,1.56,0.64,1) forwards;
}

.word-node.dragging {
  cursor: grabbing;
  z-index: 40;
}
/* Don't replay the spawn animation while being dragged */
.word-node.dragging,
.word-node.pinned {
  animation: none;
}

/* Pinned (manually placed) node — faint ring so its fixed state reads */
.word-node.pinned .node-inner {
  box-shadow: 0 0 0 1.5px rgba(255,255,255,0.35), 0 4px 20px rgba(0,0,0,0.35);
}

@keyframes nodeAppear {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.3); }
  to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* Node currently fetching its related words */
.word-node.loading .node-inner {
  animation: nodePulse 0.8s ease-in-out infinite;
}
@keyframes nodePulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.45; }
}

/* Node already expanded — softened so unexplored words stand out */
.word-node.expanded .node-inner {
  opacity: 0.72;
}

.node-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1),
              box-shadow 0.2s,
              background 0.2s;
  white-space: nowrap;
}

/* Central node */
.word-node.central .node-inner {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  padding: 16px 32px;
  background: linear-gradient(135deg, var(--accent1) 0%, var(--accent2) 100%);
  color: #fff;
  box-shadow: 0 0 40px var(--glow1), 0 0 80px var(--glow2);
  cursor: default;
  border: 2px solid rgba(255,255,255,0.2);
}

/* Satellite nodes */
.word-node.satellite .node-inner {
  font-size: 0.95rem;
  padding: 9px 18px;
  cursor: pointer;
  backdrop-filter: blur(12px);
  border: 1px solid;
  position: relative;
  overflow: hidden;
}

/* Click ripple */
.word-node.satellite .node-inner::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: rgba(255,255,255,0.15);
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}

.word-node.satellite:active .node-inner::after {
  opacity: 1;
  transform: scale(1);
}

.word-node.satellite:hover .node-inner {
  transform: scale(1.12);
}

.word-node.satellite:active .node-inner { transform: scale(0.95); }

/* Color variants */
.word-node.color-0 .node-inner { background: rgba(124,110,255,0.15); border-color: rgba(124,110,255,0.5); color: #a89fff; box-shadow: 0 4px 20px rgba(124,110,255,0.2); }
.word-node.color-1 .node-inner { background: rgba(79,195,247,0.15);  border-color: rgba(79,195,247,0.5);  color: #7dd8f8; box-shadow: 0 4px 20px rgba(79,195,247,0.2); }
.word-node.color-2 .node-inner { background: rgba(129,224,160,0.15); border-color: rgba(129,224,160,0.5); color: #9de8b3; box-shadow: 0 4px 20px rgba(129,224,160,0.2); }
.word-node.color-3 .node-inner { background: rgba(255,183,107,0.15); border-color: rgba(255,183,107,0.5); color: #ffc87a; box-shadow: 0 4px 20px rgba(255,183,107,0.2); }
.word-node.color-4 .node-inner { background: rgba(244,114,182,0.15); border-color: rgba(244,114,182,0.5); color: #f78ec4; box-shadow: 0 4px 20px rgba(244,114,182,0.2); }
.word-node.color-5 .node-inner { background: rgba(248,163,126,0.15); border-color: rgba(248,163,126,0.5); color: #faa07a; box-shadow: 0 4px 20px rgba(248,163,126,0.2); }
.word-node.color-6 .node-inner { background: rgba(167,139,250,0.15); border-color: rgba(167,139,250,0.5); color: #c4b0ff; box-shadow: 0 4px 20px rgba(167,139,250,0.2); }
.word-node.color-7 .node-inner { background: rgba(94,234,212,0.15);  border-color: rgba(94,234,212,0.5);  color: #5ef0d4; box-shadow: 0 4px 20px rgba(94,234,212,0.2); }

.word-node.color-0:hover .node-inner { background: rgba(124,110,255,0.3); box-shadow: 0 6px 30px rgba(124,110,255,0.4); }
.word-node.color-1:hover .node-inner { background: rgba(79,195,247,0.3);  box-shadow: 0 6px 30px rgba(79,195,247,0.4); }
.word-node.color-2:hover .node-inner { background: rgba(129,224,160,0.3); box-shadow: 0 6px 30px rgba(129,224,160,0.4); }
.word-node.color-3:hover .node-inner { background: rgba(255,183,107,0.3); box-shadow: 0 6px 30px rgba(255,183,107,0.4); }
.word-node.color-4:hover .node-inner { background: rgba(244,114,182,0.3); box-shadow: 0 6px 30px rgba(244,114,182,0.4); }
.word-node.color-5:hover .node-inner { background: rgba(248,163,126,0.3); box-shadow: 0 6px 30px rgba(248,163,126,0.4); }
.word-node.color-6:hover .node-inner { background: rgba(167,139,250,0.3); box-shadow: 0 6px 30px rgba(167,139,250,0.4); }
.word-node.color-7:hover .node-inner { background: rgba(94,234,212,0.3);  box-shadow: 0 6px 30px rgba(94,234,212,0.4); }

/* ─── Tree Title ────────────────────────────────────────────────────── */
.tree-title {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  pointer-events: none;
  z-index: 20;
}

/* ─── Floating Toolbar ──────────────────────────────────────────────── */
.tree-toolbar {
  position: absolute;
  top: 28px;
  right: 28px;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(10, 11, 18, 0.75);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 50px;
  padding: 6px 6px 6px 6px;
  backdrop-filter: blur(20px);
  box-shadow: 0 8px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.05) inset;
}

.toolbar-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  border: none;
  border-radius: 40px;
  padding: 10px 18px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34,1.56,0.64,1);
  white-space: nowrap;
}

/* Ghost variant — New Word */
.toolbar-btn--ghost {
  background: rgba(255,255,255,0.06);
  color: var(--muted);
  border: 1px solid rgba(255,255,255,0.08);
}
.toolbar-btn--ghost:hover {
  background: rgba(255,255,255,0.12);
  color: var(--text);
  transform: scale(1.04);
}

/* Accent variant — Regenerate */
.toolbar-btn--accent {
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  color: #fff;
  box-shadow: 0 0 16px var(--glow1);
}
.toolbar-btn--accent:hover {
  opacity: 0.9;
  transform: scale(1.06);
  box-shadow: 0 0 28px var(--glow1);
}
.toolbar-btn--accent:active { transform: scale(0.96); }

.toolbar-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.tbtn-icon { font-size: 1rem; }
.tbtn-label { font-size: 0.82rem; letter-spacing: 0.02em; }

/* Lang wrap inside toolbar */
.toolbar-lang-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 40px;
  padding: 8px 14px;
  cursor: pointer;
}

.toolbar-lang-icon { font-size: 1.15rem; line-height: 1; }

.toolbar-lang-select {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  padding-right: 18px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%236b7280' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0 center;
}
.toolbar-lang-select option {
  background: #1a1c28;
  color: var(--text);
}

/* ─── Breadcrumb ────────────────────────────────────────────────────── */
.breadcrumb {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: 90vw;
  flex-wrap: wrap;
  justify-content: center;
}

.breadcrumb-item {
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb-item .crumb {
  color: var(--accent1);
  cursor: pointer;
  transition: color 0.2s;
}

.breadcrumb-item .crumb:hover { color: var(--accent2); }
.breadcrumb-item .sep { color: var(--border); }

/* ─── Loading ───────────────────────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8,9,13,0.7);
  backdrop-filter: blur(6px);
}

.loader-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.loader-rings {
  position: relative;
  width: 80px;
  height: 80px;
}

.ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid transparent;
  animation: spin 1.4s linear infinite;
}

.ring1 {
  inset: 0;
  border-top-color: var(--accent1);
  animation-duration: 1.2s;
}
.ring2 {
  inset: 12px;
  border-top-color: var(--accent2);
  animation-duration: 1.6s;
  animation-direction: reverse;
}
.ring3 {
  inset: 24px;
  border-top-color: var(--accent3);
  animation-duration: 1s;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loader-text {
  font-size: 0.9rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50%       { opacity: 1; }
}

/* ─── Toast ─────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #2a1a1a;
  border: 1px solid rgba(244,114,182,0.4);
  color: #f78ec4;
  padding: 12px 24px;
  border-radius: 40px;
  font-size: 0.85rem;
  z-index: 100;
  transition: transform 0.4s cubic-bezier(0.34,1.56,0.64,1);
  pointer-events: none;
}

.toast.show { transform: translateX(-50%) translateY(0); }

/* ─── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .logo-text { font-size: 1.6rem; }
  .word-node.central .node-inner { font-size: 1.2rem; padding: 12px 22px; }
  .word-node.satellite .node-inner { font-size: 0.8rem; padding: 7px 14px; }
}