:root {
  --bg: #09120a;
  --surface: rgba(15, 34, 20, 0.84);
  --surface-strong: rgba(21, 46, 27, 0.94);
  --panel: rgba(26, 56, 34, 0.90);
  --border: rgba(138, 210, 122, 0.24);
  --text: #f3fbf1;
  --muted: #b0cfae;
  --accent: #8ad27a;
  --accent-2: #b8ea92;
  --violet: #72be68;
  --indigo: #4f9557;
  --rose: #d8f3ae;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.44);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "DM Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left,  rgba(138, 210, 122, 0.20), transparent 28%),
    radial-gradient(circle at 85% 0%,    rgba(79, 149, 87, 0.18), transparent 26%),
    radial-gradient(circle at 50% 100%,  rgba(216, 243, 174, 0.12), transparent 40%),
    linear-gradient(180deg, #09120a 0%, #0d1910 50%, #081109 100%);
}

a { color: inherit; }

code,
pre {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.83em;
}

pre {
  background: rgba(0, 0, 0, 0.45);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 16px;
  overflow-x: auto;
  margin: 8px 0 0;
}

/* ── Topbar ── */

.topbar,
.hero,
.viewer-shell,
.sidebar,
.source-header,
.source-card {
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 3;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 16px 28px;
  background: rgba(9, 18, 10, 0.90);
  border-bottom: 1px solid var(--border);
}

.topbar-brand { display: flex; flex-direction: column; gap: 1px; }


.topbar h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--indigo) 60%, var(--rose) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.eyebrow {
  margin: 0;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 1.4px;
  color: var(--muted);
  font-family: "JetBrains Mono", monospace;
}



/* ── Tabs ── */

.tab-nav {
  display: flex;
  gap: 4px;
  align-items: center;
}

.tab {
  padding: 7px 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.18s, border-color 0.18s, background 0.18s;
}

.tab:hover { color: var(--text); background: rgba(138, 210, 122, 0.12); }

.tab.active {
  color: var(--text);
  border-color: var(--border);
  background: rgba(138, 210, 122, 0.17);
}

.tab-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

/* ── Main layout ── */

main { padding: 0 0 32px; }

/* ── Studio panel ── */

.panel-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 0;
  min-height: calc(100vh - 68px);
}

@media (max-width: 900px) {
  .panel-grid { grid-template-columns: 1fr; }
}

.viewer-shell {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 20px;
  padding: 32px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  min-height: 520px;
}

/* ── Upload zone ── */

.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  max-width: 520px;
  min-height: 300px;
  border: 2px dashed rgba(138, 210, 122, 0.34);
  border-radius: 16px;
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.viewer-shell.has-image .upload-zone {
  max-width: none;
  min-height: 0;
  padding: 18px 20px;
  gap: 8px;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  background: rgba(138, 210, 122, 0.10);
}

.upload-icon {
  font-size: 2.8rem;
  color: var(--accent);
  opacity: 0.7;
  line-height: 1;
}

.upload-hint { margin: 0; font-size: 1rem; color: var(--text); }
.upload-link { color: var(--accent); text-decoration: underline; cursor: pointer; }
.upload-sub  { margin: 0; font-size: 0.8rem; color: var(--muted); }

/* ── Canvas area ── */

.canvas-area { width: 100%; }

.canvas-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  align-items: start;
}

.canvas-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.canvas-card canvas,
.canvas-wrapper canvas {
  width: 100%;
  height: auto;
  background: rgba(0, 0, 0, 0.18);
}

.canvas-label {
  margin: 0;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  font-family: "JetBrains Mono", monospace;
}

canvas {
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  display: block;
}

.canvas-wrapper { position: relative; }

/* ── Processing overlay ── */

.processing-overlay {
  display: none;
  position: absolute;
  inset: 0;
  background: rgba(9, 18, 10, 0.74);
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  color: var(--accent);
  font-size: 0.9rem;
}

.processing-overlay.actif { display: flex; }

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(138, 210, 122, 0.28);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ── Actions ── */

.actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 20px;
  flex-wrap: wrap;
}

@media (max-width: 700px) {
  .canvas-row {
    grid-template-columns: 1fr;
  }
}

button {
  padding: 9px 20px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: rgba(138, 210, 122, 0.16);
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.18s, border-color 0.18s;
}

button:hover { background: rgba(138, 210, 122, 0.30); border-color: var(--accent); }
button:disabled { opacity: 0.38; pointer-events: none; }

.ghost-btn {
  background: transparent;
  border-color: rgba(138, 210, 122, 0.24);
  color: var(--muted);
}

.ghost-btn:hover { color: var(--text); background: rgba(138, 210, 122, 0.12); }

.accent-btn {
  background: linear-gradient(135deg, rgba(138, 210, 122, 0.58), rgba(79, 149, 87, 0.58));
  border-color: rgba(138, 210, 122, 0.52);
}

.accent-btn:hover {
  background: linear-gradient(135deg, rgba(138, 210, 122, 0.76), rgba(79, 149, 87, 0.74));
}

/* ── Sidebar ── */

.sidebar {
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  background: var(--panel);
  border-left: 1px solid var(--border);
}

.ctrl-section { display: flex; flex-direction: column; gap: 10px; }

.ctrl-title {
  margin: 0;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--muted);
  font-family: "JetBrains Mono", monospace;
}

.select-wrap { display: block; }

select {
  width: 100%;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(18, 8, 32, 0.80);
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239a82c0' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  cursor: pointer;
}

select:focus { outline: none; border-color: var(--accent); }

.ctrl-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.muted { color: var(--muted); font-size: 0.82rem; }

input[type="range"] {
  flex: 1;
  min-width: 60px;
  accent-color: var(--accent);
  cursor: pointer;
}

input[type="color"] {
  width: 34px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px;
  background: transparent;
  cursor: pointer;
}

.value-badge {
  min-width: 30px;
  text-align: right;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  color: var(--accent);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.875rem;
  color: var(--muted);
  cursor: pointer;
}

.checkbox-row input { accent-color: var(--accent); cursor: pointer; }

/* ── Gallery ── */

.gallery-panel {
  padding: 32px 28px 40px;
}

.gallery-header {
  max-width: 900px;
  margin: 0 auto 28px;
}

.gallery-header h2 {
  margin: 0 0 10px;
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gallery-header p { margin: 0 0 16px; color: var(--muted); font-size: 0.92rem; line-height: 1.6; }


.gallery-k-section { max-width: 1100px; margin: 0 auto; }

.k-section-groups { display: flex; flex-direction: column; gap: 36px; }

/* Vertex-pair group */
.vp-group { }
.vp-group-title {
  margin: 0 0 16px;
  font-size: 0.80rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
  border-bottom: 1px solid rgba(138, 210, 122, 0.20);
  padding-bottom: 8px;
}

.vp-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

/* Gallery card */
.gallery-card {
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.18s;
}

.gallery-card:hover {
  border-color: rgba(138, 210, 122, 0.46);
  transform: translateY(-2px);
}

.gallery-canvas-wrap canvas {
  width: 100%;
  height: 140px;
  border-radius: 0;
  border: none;
  display: block;
}

.gallery-card-body { padding: 12px 14px 14px; }

.gallery-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.gallery-card-name {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
}

.gallery-notation {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.70rem;
  color: var(--accent);
  white-space: nowrap;
}

.gallery-card-desc {
  margin: 0 0 10px;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.5;
}

.gallery-use-btn {
  width: 100%;
  padding: 7px 12px;
  font-size: 0.78rem;
  border-radius: 7px;
  background: rgba(138, 210, 122, 0.15);
  border-color: rgba(138, 210, 122, 0.30);
}

.gallery-use-btn:hover {
  background: rgba(138, 210, 122, 0.32);
  border-color: var(--accent);
}



/* ── Source panel ── */

.source-panel { padding: 32px 28px 48px; max-width: 960px; margin: 0 auto; }

.source-header { margin-bottom: 32px; }

.source-header h2 {
  margin: 0 0 10px;
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.source-header p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.6; }

.source-stack { display: flex; flex-direction: column; gap: 32px; }

.source-group { display: flex; flex-direction: column; gap: 14px; }

.source-group-title {
  margin: 0;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 1.3px;
  color: var(--accent);
  font-family: "JetBrains Mono", monospace;
}

.source-list { display: flex; flex-direction: column; gap: 12px; }

.source-card {
  padding: 16px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
}

.source-card h4 { margin: 0 0 6px; font-size: 0.9rem; font-weight: 600; }

.source-card p { margin: 0; color: var(--muted); font-size: 0.85rem; line-height: 1.55; }

.filename-pill {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  background: rgba(138, 210, 122, 0.16);
  border: 1px solid rgba(138, 210, 122, 0.30);
  border-radius: 5px;
  padding: 2px 8px;
  color: var(--accent);
}

.source-card-export h4 code {
  font-size: 0.82rem;
  color: var(--accent-2);
}

/* ── Hero / status bar ── */

.hero {
  padding: 20px 28px;
  background: rgba(9, 18, 10, 0.74);
  border-top: 1px solid var(--border);
  text-align: center;
}

.hero p { margin: 0 0 4px; font-size: 0.82rem; color: var(--muted); }
.hero p:last-child { margin: 0; }

.hero-note {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--accent);
}