/* =============================================
   Lumora — Design Tokens
   ============================================= */
:root {
  --color-bg:         #0f0f11;
  --color-surface:    #1a1a1f;
  --color-surface-2:  #24242b;
  --color-border:     #2e2e38;
  --color-accent:     #7c6ff7;
  --color-accent-dim: #4e49a8;
  --color-text:       #e8e8f0;
  --color-text-muted: #7a7a8e;
  --color-success:    #4ade80;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --shadow-card: 0 4px 24px rgba(0,0,0,.45);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: 180ms ease;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

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

/* =============================================
   Header
   ============================================= */
.app-header {
  width: 100%;
  padding: 20px 32px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--color-border);
}

.app-brand {
  display: flex;
  align-items: flex-end;
  line-height: 1;
}

.app-logo {
  height: 2.2rem;
  width: auto;
  object-fit: contain;
  /* Pull 'umora' under the L's horizontal bar;
     adjust if your PNG's right whitespace differs */
  margin-right: -0.7rem;
  margin-bottom: -0.45rem;
}

.app-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.app-tagline {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-left: 2px;
  align-self: flex-end;
  padding-bottom: 2px;
}

/* =============================================
   Main layout
   ============================================= */
.app-main {
  width: 100%;
  max-width: 880px;
  padding: 32px 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* =============================================
   Tool Tabs
   ============================================= */
.tool-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0;
}

.tool-tab {
  padding: 8px 18px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color var(--transition), border-color var(--transition);
}

.tool-tab:hover { color: var(--color-text); }

.tool-tab[aria-selected="true"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* =============================================
   Tool Panel
   ============================================= */
.tool-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.tool-panel:empty { display: none; }

/* ---- Control rows ---- */
.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* ---- Pill selector ---- */
.pill-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  padding: 6px 14px;
  border-radius: 99px;
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.pill:hover { color: var(--color-text); border-color: #4a4a58; }

.pill.active,
.pill[aria-pressed="true"] {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
  color: #fff;
}

/* ---- Range slider ---- */
.slider-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.slider-row input[type="range"] {
  -webkit-appearance: none;
  flex: 1;
  height: 4px;
  border-radius: 99px;
  background: var(--color-border);
  outline: none;
  cursor: pointer;
  accent-color: var(--color-accent);
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  box-shadow: 0 0 0 3px rgba(124,111,247,.25);
}

.slider-value {
  min-width: 36px;
  text-align: right;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* =============================================
   Upload Zone
   ============================================= */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  transition: border-color var(--transition), background var(--transition);
  cursor: pointer;
}

.upload-zone.drag-over {
  border-color: var(--color-accent);
  background: rgba(124,111,247,.06);
}

.upload-prompt {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: none;
}

.upload-icon {
  font-size: 2.25rem;
  color: var(--color-accent);
}

.upload-prompt p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.upload-hint {
  font-size: 0.775rem !important;
  color: #4a4a58 !important;
}

.link-btn {
  background: none;
  border: none;
  color: var(--color-accent);
  font-size: inherit;
  font-family: inherit;
  cursor: pointer;
  pointer-events: all;
  text-decoration: underline;
  padding: 0;
}

/* =============================================
   Workspace
   ============================================= */
.workspace {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.canvas-wrap {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: repeating-conic-gradient(#1e1e24 0% 25%, #18181d 0% 50%) 0 0 / 20px 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
}

/* Processing overlay */
.canvas-loader {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(15, 15, 17, 0.55);
  backdrop-filter: blur(2px);
  border-radius: var(--radius-md);
  z-index: 10;
}

.canvas-loader[hidden] { display: none; }

.canvas-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(124, 111, 247, 0.2);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

#previewCanvas {
  display: block;
  max-width: 100%;
  max-height: 60vh;
  border-radius: var(--radius-sm);
}

.workspace-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* =============================================
   Buttons
   ============================================= */
.btn {
  padding: 9px 22px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover { background: #9188f8; }

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  border-color: var(--color-border);
}
.btn-secondary:hover { color: var(--color-text); border-color: #4a4a58; }

/* =============================================
   Processing overlay
   ============================================= */
.processing-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

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

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 600px) {
  .app-main { padding: 20px 16px 48px; }
  .tool-panel { padding: 16px; }
  .upload-zone { padding: 32px 16px; }
}