/* ============================================
   SVGFlow — Fluid Wave Background Generator
   Premium CSS Layer
   ============================================ */

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

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

:root {
  --sidebar-width: 320px;
  --bg-primary: #0a0b0f;
  --bg-secondary: #10121a;
  --bg-tertiary: #161824;
  --bg-glass: rgba(22, 24, 36, 0.85);
  --border-subtle: rgba(255,255,255,0.07);
  --border-medium: rgba(255,255,255,0.12);
  --text-primary: #f0f2ff;
  --text-secondary: #8b91b3;
  --text-muted: #4a5070;
  --accent-blue: #5b8dee;
  --accent-violet: #8b5cf6;
  --accent-green: #10d9a8;
  --accent-gold: #f5c842;
  --accent-glow: rgba(91,141,238,0.4);
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* ── Layout ── */
#app {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

/* ── Sidebar ── */
#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-glass);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 10;
  position: relative;
}

#sidebar::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(91,141,238,0.6), transparent);
}

/* Scrollbar */
#sidebar::-webkit-scrollbar { width: 4px; }
#sidebar::-webkit-scrollbar-track { background: transparent; }
#sidebar::-webkit-scrollbar-thumb { background: var(--border-medium); border-radius: 2px; }

/* ── Logo / Header ── */
.sidebar-header {
  padding: 24px 22px 18px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.logo-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.logo-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, #5b8dee, #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  box-shadow: 0 4px 16px rgba(91,141,238,0.35);
  flex-shrink: 0;
}

.logo-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
  background: linear-gradient(135deg, #f0f2ff, #8b91b3);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-tag {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  font-weight: 400;
}

/* ── Controls Body ── */
.sidebar-body {
  padding: 20px 22px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* ── Section Titles ── */
.section-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ── Control Groups ── */
.control-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.control-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.control-value {
  font-size: 12px;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-blue);
  min-width: 30px;
  text-align: right;
}

/* ── Sliders ── */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  position: relative;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent-blue) var(--progress, 50%), var(--bg-tertiary) var(--progress, 50%));
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 0 10px var(--accent-glow);
  margin-top: -6px;
  cursor: pointer;
  transition: box-shadow 0.2s, transform 0.15s;
}

input[type="range"]:hover::-webkit-slider-thumb {
  box-shadow: 0 0 18px var(--accent-glow);
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 0 10px var(--accent-glow);
  cursor: pointer;
}

/* ── Divider ── */
.divider {
  height: 1px;
  background: var(--border-subtle);
  border: none;
  flex-shrink: 0;
}

/* ── Gradient Palette Grid ── */
.palette-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-top: 4px;
}

.palette-card {
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
  border: 2px solid transparent;
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
  aspect-ratio: 1 / 0.75;
}

.palette-card:hover {
  transform: scale(1.04);
}

.palette-card.active {
  border-color: #fff;
  box-shadow: 0 0 14px rgba(255,255,255,0.25);
}

.palette-preview {
  width: 100%;
  height: 100%;
  display: block;
}

.palette-name {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 4px 6px 5px;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-align: center;
  background: linear-gradient(transparent, rgba(0,0,0,0.65));
  color: rgba(255,255,255,0.9);
  text-transform: uppercase;
}

/* ── Export Block ── */
.export-block {
  padding: 20px 22px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex-shrink: 0;
  background: rgba(0,0,0,0.15);
}

/* ── Buttons ── */
.btn {
  width: 100%;
  padding: 11px 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  border: none;
  outline: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background 0.15s;
}

.btn:hover::before {
  background: rgba(255,255,255,0.06);
}

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

/* Free button */
.btn-free {
  background: linear-gradient(135deg, rgba(91,141,238,0.18), rgba(139,92,246,0.15));
  border: 1px solid rgba(91,141,238,0.4);
  color: var(--text-primary);
}

.btn-free:hover {
  border-color: rgba(91,141,238,0.7);
  box-shadow: 0 0 20px rgba(91,141,238,0.2);
}

/* Premium button */
.btn-premium {
  background: linear-gradient(135deg, #b5860a, #e6aa20, #f5c842);
  color: #1a1000;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(245,200,66,0.3);
}

.btn-premium:hover {
  box-shadow: 0 4px 30px rgba(245,200,66,0.5);
  transform: translateY(-1px);
}

.btn-premium:active { transform: scale(0.97) translateY(0); }

.premium-caption {
  font-size: 10.5px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
  padding: 0 4px;
}

/* ── SVG Canvas ── */
#canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #06070d;
}

#wave-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* Canvas overlay badge */
.canvas-badge {
  position: absolute;
  top: 18px;
  right: 18px;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 5;
}

.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

/* ── Modal Overlay ── */
#modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
}

#modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal-box {
  background: #14161f;
  border: 1px solid var(--border-medium);
  border-radius: 18px;
  padding: 32px;
  width: 420px;
  max-width: calc(100vw - 40px);
  box-shadow: 0 25px 80px rgba(0,0,0,0.6);
  position: relative;
  transform: translateY(16px) scale(0.97);
  transition: transform 0.25s;
}

#modal-overlay.open .modal-box {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
  transition: color 0.15s;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
}

.modal-close:hover { color: var(--text-primary); background: rgba(255,255,255,0.06); }

.modal-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(245,200,66,0.15), rgba(245,200,66,0.05));
  border: 1px solid rgba(245,200,66,0.3);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-gold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.modal-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.modal-price {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent-gold);
  margin-bottom: 20px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.modal-price sup {
  font-size: 18px;
  font-weight: 600;
}

.modal-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.modal-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text-secondary);
}

.feature-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(91,141,238,0.2), rgba(139,92,246,0.2));
  border: 1px solid rgba(91,141,238,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  flex-shrink: 0;
}

.modal-cta {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  background: linear-gradient(135deg, #b5860a, #e6aa20, #f5c842);
  border: none;
  color: #1a1000;
  font-size: 15px;
  font-weight: 700;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 6px 24px rgba(245,200,66,0.35);
}

.modal-cta:hover {
  box-shadow: 0 8px 32px rgba(245,200,66,0.5);
  transform: translateY(-1px);
}

.modal-disclaimer {
  margin-top: 12px;
  font-size: 10.5px;
  color: var(--text-muted);
  text-align: center;
}

/* ── Toast ── */
#toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1c1f2e;
  border: 1px solid var(--border-medium);
  border-radius: 10px;
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 200;
  pointer-events: none;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
  white-space: nowrap;
}

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

.toast-icon { font-size: 15px; }

/* ── Responsive ── */
@media (max-width: 700px) {
  :root { --sidebar-width: 100vw; }
  #app { flex-direction: column; }
  #sidebar { width: 100%; min-width: 100%; height: auto; max-height: 55vh; border-right: none; border-bottom: 1px solid var(--border-subtle); }
  #canvas-area { flex: 1; min-height: 0; }
}

/* ── Misc ── */
.flex-gap { display: flex; align-items: center; gap: 8px; }

/* Number of waves — segmented control */
.seg-control {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: 8px;
  padding: 3px;
  gap: 3px;
}

.seg-btn {
  flex: 1;
  padding: 6px 0;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all 0.2s;
}

.seg-btn.active {
  background: rgba(91,141,238,0.2);
  color: var(--accent-blue);
  box-shadow: 0 0 10px rgba(91,141,238,0.15);
}

.seg-btn:hover:not(.active) {
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
}

/* Animate sidebar-in on load */
@keyframes slide-in {
  from { transform: translateX(-20px); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}

#sidebar { animation: slide-in 0.4s ease both; }

@keyframes fade-in-up {
  from { transform: translateY(10px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.canvas-badge { animation: fade-in-up 0.5s 0.3s ease both; }

/* Copy feedback animation */
@keyframes pop {
  0%  { transform: scale(1); }
  50% { transform: scale(0.94); }
  100%{ transform: scale(1); }
}

.btn.copied { animation: pop 0.2s ease; }