/* ─────────────────────────────────────────────
   Color Palette Studio — style.css
   ───────────────────────────────────────────── */

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

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

:root {
  --bg:           #0d0f14;
  --surface:      #13161e;
  --surface2:     #1a1e2a;
  --surface3:     #222736;
  --border:       rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.14);
  --accent:       #7c6af7;
  --accent2:      #c47af7;
  --accent-glow:  rgba(124,106,247,0.35);
  --text:         #e8eaf0;
  --text-muted:   #7b8098;
  --text-dim:     #4b5068;
  --radius:       14px;
  --radius-sm:    8px;
  --shadow:       0 8px 32px rgba(0,0,0,0.5);
  --transition:   0.22s cubic-bezier(0.4,0,0.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ── Background grid decoration ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ── Header ── */
header {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 56px 24px 40px;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(124,106,247,0.12);
  border: 1px solid rgba(124,106,247,0.3);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

header h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 30%, var(--accent2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

header p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 480px;
  margin: 0 auto;
}

/* ── Main layout ── */
main {
  position: relative;
  z-index: 5;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px 80px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

/* ── Section card ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 28px 32px;
  box-shadow: var(--shadow);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
}

.section-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 1rem;
}

.icon-purple { background: rgba(124,106,247,0.18); }
.icon-pink   { background: rgba(196,122,247,0.18); }
.icon-teal   { background: rgba(78,201,188,0.18); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition);
}
.btn:hover::after { background: rgba(255,255,255,0.06); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(124,106,247,0.55);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--border-hover);
  background: var(--surface3);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.8rem;
}

/* ── Upload zone ── */
#drop-zone {
  border: 2px dashed var(--border-hover);
  border-radius: var(--radius);
  padding: 52px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--surface2);
  position: relative;
  overflow: hidden;
}

#drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(124,106,247,0.06);
  box-shadow: 0 0 0 1px var(--accent), inset 0 0 40px rgba(124,106,247,0.04);
}

#drop-zone:hover {
  border-color: rgba(124,106,247,0.5);
  background: var(--surface3);
}

.drop-icon {
  font-size: 2.8rem;
  margin-bottom: 16px;
  display: block;
  line-height: 1;
}

.drop-title {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
}

.drop-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* Image preview ── */
#img-preview-wrap {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

#img-preview-wrap.visible { display: flex; }

#img-preview {
  max-height: 220px;
  max-width: 100%;
  border-radius: 10px;
  object-fit: contain;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

/* ── Palette grid ── */
.palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 14px;
}

.palette-empty {
  text-align: center;
  color: var(--text-dim);
  padding: 32px;
  font-size: 0.9rem;
  width: 100%;
}

/* ── Color card ── */
.color-card {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface2);
  transition: transform var(--transition), box-shadow var(--transition);
  animation: fadeScale 0.35s ease both;
}

.color-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.5);
  border-color: var(--border-hover);
}

@keyframes fadeScale {
  from { opacity: 0; transform: scale(0.92) translateY(8px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.color-swatch {
  height: 110px;
  width: 100%;
  cursor: pointer;
  position: relative;
  transition: filter var(--transition);
}

.color-swatch:hover { filter: brightness(1.08); }

.copy-hint {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0,0,0,0);
  transition: background var(--transition);
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255,255,255,0);
  letter-spacing: 0.04em;
}

.color-swatch:hover .copy-hint {
  background: rgba(0,0,0,0.25);
  color: rgba(255,255,255,0.9);
}

.color-info {
  padding: 10px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hex-label {
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

.hex-label:hover { color: var(--accent); }

.card-actions {
  display: flex;
  gap: 6px;
  align-items: center;
}

.card-actions button {
  border: none;
  background: var(--surface3);
  color: var(--text-muted);
  border-radius: 6px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  font-size: 0.75rem;
  display: grid;
  place-items: center;
  transition: all var(--transition);
  border: 1px solid transparent;
}

.card-actions button:hover {
  background: rgba(124,106,247,0.18);
  color: var(--accent);
  border-color: rgba(124,106,247,0.3);
}

.card-actions button.locked {
  background: rgba(124,106,247,0.18);
  color: var(--accent);
  border-color: rgba(124,106,247,0.4);
}

/* ── Color editor modal (picker + sliders) ── */
.color-editor-wrap {
  margin-top: 8px;
  background: var(--surface3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: none;
  flex-direction: column;
  gap: 10px;
  animation: slideDown 0.2s ease;
}

.color-editor-wrap.open { display: flex; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slider-row label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  width: 20px;
  text-transform: uppercase;
}

.slider-row input[type=range] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--surface2);
  outline: none;
  cursor: pointer;
}

.slider-row input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent-glow);
  cursor: pointer;
}

.slider-row span {
  font-family: 'Fira Code', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
  width: 28px;
  text-align: right;
}

/* ── Generator controls ── */
.gen-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.scheme-select {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  padding: 8px 14px;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition);
}

.scheme-select:hover, .scheme-select:focus {
  border-color: var(--accent);
}

/* ── Gradient preview ── */
#gradient-bar {
  height: 54px;
  border-radius: var(--radius-sm);
  transition: background 0.4s ease;
  border: 1px solid var(--border);
  display: none;
}

#gradient-bar.visible { display: block; }

/* ── Export toolbar ── */
.export-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ── Toast ── */
#toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: var(--surface3);
  border: 1px solid var(--border-hover);
  color: var(--text);
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
  z-index: 1000;
  white-space: nowrap;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── CSS Variables Export ── */
#css-output {
  display: none;
  background: var(--surface3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: pre;
  line-height: 1.7;
  overflow-x: auto;
  margin-top: 14px;
  animation: fadeScale 0.25s ease;
}

#css-output.visible { display: block; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
  background: var(--surface3);
  border-radius: 4px;
}

/* ── Footer ── */
footer {
  position: relative;
  z-index: 5;
  text-align: center;
  padding: 0 0 40px;
  color: var(--text-dim);
  font-size: 0.82rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .card { padding: 18px 16px 22px; }
  .section-header { margin-bottom: 18px; }
  .palette-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .export-toolbar { gap: 8px; }
  .gen-controls { gap: 8px; }
}