/* ═══════════════════════════════════════════════════════════════════════════
   SAE501 — Web Sémantique — app.css  (light theme)
   ═══════════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ── Variables ─────────────────────────────────────────────────────────── */
:root {
  --bg:        #ffffff;
  --bg2:       #fafafa;
  --sidebar:   #f4f4f5;
  --border:    #e4e4e7;
  --border2:   #d4d4d8;
  --text:      #09090b;
  --text2:     #52525b;
  --text3:     #a1a1aa;
  --shadow:    rgba(0, 0, 0, 0.06);
  --shadow2:   rgba(0, 0, 0, 0.12);
  --ease:      cubic-bezier(0.4, 0, 0.2, 1);
  --sidebar-w: 230px;
}

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

/* ── Body ──────────────────────────────────────────────────────────────── */
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Header ────────────────────────────────────────────────────────────── */
header {
  position: relative; z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0.65rem 1.4rem;
  display: flex; align-items: center; gap: 0.9rem;
  flex-shrink: 0;
  box-shadow: 0 1px 3px var(--shadow);
}

.header-dot {
  flex-shrink: 0;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--text);
  animation: dotPulse 3s ease-in-out infinite;
}
@keyframes dotPulse {
  0%, 100% { opacity: 1;   transform: scale(1); }
  50%       { opacity: .35; transform: scale(.7); }
}

header h1 {
  font-size: .95rem; font-weight: 600;
  letter-spacing: -.025em;
  color: var(--text);
}
header .subtitle {
  font-size: .68rem; font-weight: 500;
  color: var(--text3);
  text-transform: uppercase; letter-spacing: .09em;
  padding: .15rem .45rem;
  border: 1px solid var(--border2);
  border-radius: 4px;
  background: var(--sidebar);
}

/* ── Layout ────────────────────────────────────────────────────────────── */
main { flex: 1; display: flex; overflow: hidden; }

#app {
  display: flex; flex-direction: row;
  width: 100%; height: 100%;
}

/* ── Sidebar ───────────────────────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  display: flex; flex-direction: column;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto; overflow-x: hidden;
  position: relative; z-index: 10;
}

/* ── Sidebar sections ──────────────────────────────────────────────────── */
.sb-section {
  padding: 1.1rem 1rem .9rem;
  display: flex; flex-direction: column; gap: .5rem;
}

.sb-label {
  font-size: .65rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--text3);
}

.sb-divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}

/* Sidebar select */
.sb-select {
  width: 100%;
  padding: .38rem 1.8rem .38rem .6rem;
  border: 1px solid var(--border2);
  border-radius: 7px;
  background: var(--bg);
  color: var(--text);
  font-size: .78rem; font-family: inherit; font-weight: 400;
  cursor: pointer;
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23a1a1aa'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .55rem center;
  box-shadow: 0 1px 2px var(--shadow);
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.sb-select option { background: #fff; color: #09090b; }
.sb-select:hover   { border-color: var(--text3); }
.sb-select:focus   {
  outline: none;
  border-color: var(--text);
  box-shadow: 0 0 0 3px rgba(0,0,0,.07);
}

/* ── Viz cards ─────────────────────────────────────────────────────────── */
.viz-cards { display: flex; flex-direction: column; gap: .25rem; }

.viz-card {
  position: relative;
  display: flex; align-items: center; gap: .65rem;
  width: 100%;
  padding: .55rem .7rem;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition:
    background   .15s var(--ease),
    border-color .15s var(--ease),
    color        .15s var(--ease),
    box-shadow   .15s var(--ease);
}

.viz-card:hover {
  background: var(--bg);
  border-color: var(--border2);
  color: var(--text);
  box-shadow: 0 1px 3px var(--shadow);
}
.viz-card:active { transform: scale(0.985); }

/* Active state */
.viz-card.active {
  background: var(--bg);
  border-color: var(--border2);
  color: var(--text);
  box-shadow: 0 1px 4px var(--shadow2);
}

/* Left accent bar */
.viz-card.active::before {
  content: '';
  position: absolute;
  left: 0; top: 18%; bottom: 18%; width: 2.5px;
  background: var(--text);
  border-radius: 0 2px 2px 0;
}

/* Card icon */
.vc-icon {
  font-size: 1.2rem;
  width: 1.8rem; text-align: center;
  flex-shrink: 0;
  color: var(--text3);
  transition: color .15s var(--ease);
}
.viz-card:hover .vc-icon  { color: var(--text2); }
.viz-card.active .vc-icon { color: var(--text); }

/* Card body */
.vc-body { display: flex; flex-direction: column; gap: .06rem; }
.vc-name { font-size: .8rem; font-weight: 600; line-height: 1.2; }
.vc-desc { font-size: .67rem; color: var(--text3); font-weight: 400; }

/* Sidebar footer */
.sb-footer {
  margin-top: auto;
  padding: .9rem 1rem;
  border-top: 1px solid var(--border);
}
.sb-footer-text {
  font-size: .62rem; font-weight: 400;
  color: var(--text3); letter-spacing: .05em;
}

/* ── Viz container ─────────────────────────────────────────────────────── */
#viz-container {
  flex: 1; overflow: hidden;
  position: relative;
  background: var(--bg2);
}

#viz-container svg {
  display: block;
  width: 100%; height: 100%;
  animation: svgFadeIn .25s var(--ease) both;
}
@keyframes svgFadeIn {
  from { opacity: 0; transform: scale(.988); }
  to   { opacity: 1; transform: scale(1); }
}

/* ── Loading ───────────────────────────────────────────────────────────── */
#loading {
  position: absolute; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 1rem;
  background: rgba(250, 250, 250, .92);
  backdrop-filter: blur(4px);
  font-size: 0;
}
#loading.hidden { display: none; }

#loading::before {
  content: '';
  width: 36px; height: 36px;
  border: 2px solid var(--border2);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
#loading::after {
  content: 'Chargement…';
  font-size: .8rem; font-family: 'Inter', system-ui, sans-serif;
  color: var(--text2); letter-spacing: .05em;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Error / placeholder ───────────────────────────────────────────────── */
#error-message {
  padding: 2rem; color: #dc2626;
  font-weight: 500; font-size: .88rem;
}
#error-message.hidden { display: none; }

.viz-placeholder {
  width: 100%; height: 100%;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 1rem; padding: 3rem;
  text-align: center;
  color: var(--text3); font-size: .85rem;
}
.viz-placeholder::before {
  content: '◉';
  font-size: 3rem;
  color: var(--border2);
  display: block;
}

/* ── D3 link class (CollapsibleTree) ───────────────────────────────────── */
.ct-link {
  fill: none;
  stroke: #d4d4d8;
  stroke-width: 1.5px;
}

/* ── Scrollbar ─────────────────────────────────────────────────────────── */
::-webkit-scrollbar               { width: 5px; height: 5px; }
::-webkit-scrollbar-track         { background: transparent; }
::-webkit-scrollbar-thumb         { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover   { background: var(--text3); }