/* ══════════════════════════════════════════
   ImgWav — Modern Redesign
   ══════════════════════════════════════════ */

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

:root,
[data-theme="dark"] {
  /* Palette — Dark */
  --bg-0: #16161d;
  --bg-1: #1c1c24;
  --bg-2: #22222b;
  --bg-3: #2b2b36;
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.13);
  --text: #ececf1;
  --text-2: #a1a1aa;
  --text-3: #6b6b76;
  --accent: #7c6ff7;
  --accent-hover: #8b80ff;
  --accent-soft: rgba(124,111,247,0.12);
  --accent-glow: rgba(124,111,247,0.25);
  --green: #34d399;
  --orange: #fbbf24;
  --red: #f87171;
  --canvas-bg: #000;
  --select-opt-bg: #1c1c24;
  color-scheme: dark;
}

[data-theme="light"] {
  /* Palette — Light */
  --bg-0: #f4f4f7;
  --bg-1: #ffffff;
  --bg-2: #eeeef2;
  --bg-3: #dddde3;
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(0,0,0,0.15);
  --text: #1a1a2e;
  --text-2: #555566;
  --text-3: #8888a0;
  --accent: #6c5ce7;
  --accent-hover: #5a4bd1;
  --accent-soft: rgba(108,92,231,0.1);
  --accent-glow: rgba(108,92,231,0.2);
  --green: #059669;
  --orange: #d97706;
  --red: #dc2626;
  --canvas-bg: #e8e8ec;
  --select-opt-bg: #ffffff;
  color-scheme: light;

  /* Sizing */
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --gap: 1.25rem;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-0);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── App Container ── */
.app {
  max-width: 880px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

/* ── Header ── */
header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.5rem;
}

.logo-icon {
  width: 36px; height: 36px;
  flex-shrink: 0;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #a78bfa 0%, var(--accent) 50%, #6366f1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-2);
  font-size: 0.95rem;
  margin-top: 0.15rem;
}

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.75rem;
  padding: 0.3rem 0.9rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--green);
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.15);
  border-radius: 999px;
  letter-spacing: 0.01em;
}

/* ── Tab Bar ── */
.tab-bar {
  display: flex;
  gap: 4px;
  margin-bottom: 1.75rem;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
}

.tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-3);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}

.tab:hover {
  color: var(--text-2);
  background: var(--bg-2);
}

.tab.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 16px var(--accent-glow), inset 0 1px 0 rgba(255,255,255,0.12);
}

.tab-icon {
  width: 18px; height: 18px;
  flex-shrink: 0;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Upload Area ── */
.upload-area {
  border: 2px dashed var(--border-hover);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-1);
  position: relative;
}

.upload-area::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  background: radial-gradient(ellipse at center, var(--accent-soft) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--accent);
  background: var(--bg-2);
}

.upload-area:hover::before,
.upload-area.drag-over::before {
  opacity: 1;
}

.upload-icon-ring {
  width: 56px; height: 56px;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 1.5px solid rgba(124,111,247,0.2);
  color: var(--accent);
  transition: all var(--transition);
}

.upload-area:hover .upload-icon-ring {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.upload-icon {
  width: 24px; height: 24px;
}

.upload-text {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
}

.browse-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.browse-link:hover {
  border-bottom-color: var(--accent);
}

.upload-hint {
  font-size: 0.8rem;
  color: var(--text-3);
  margin-top: 0.5rem;
}

/* ── Card (shared section style) ── */
.card {
  margin-top: var(--gap);
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: border-color var(--transition);
}

.card:hover {
  border-color: var(--border-hover);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  color: var(--text-2);
}

.card-header svg {
  flex-shrink: 0;
  opacity: 0.6;
}

.card-header h2 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

/* ── Settings Grid ── */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0.9rem;
}

.field label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-3);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.field input,
.field select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  background: var(--bg-0);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  transition: all var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5l3 3 3-3' stroke='%236b6b76' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.7rem center;
  padding-right: 2rem;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.field input:hover,
.field select:hover {
  border-color: var(--border-hover);
}

.field input[type="color"] {
  height: 38px;
  padding: 3px;
  cursor: pointer;
  border-radius: var(--radius-xs);
}

.field input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.field input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}

.field-wide {
  grid-column: 1 / -1;
}

/* ── Resolution Info ── */
.resolution-info {
  margin-top: 0.9rem;
  padding: 0.6rem 0.9rem;
  background: var(--bg-0);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: 0.8rem;
  color: var(--text-3);
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1rem;
}

.resolution-info .res-warn {
  color: var(--orange);
  font-weight: 600;
}

/* ── Canvas Frames ── */
.canvas-frame {
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--canvas-bg, #000);
  display: flex;
  justify-content: center;
  border: 1px solid var(--border);
}

.canvas-frame canvas {
  max-width: 100%;
  height: auto;
}

.waveform-frame canvas {
  width: 100%;
  height: 140px;
}

/* ── Audio Player ── */
.player-wrap {
  margin-bottom: 1rem;
}

audio {
  width: 100%;
  border-radius: var(--radius-xs);
  outline: none;
  filter: contrast(0.95) brightness(0.95);
}

/* ── Buttons ── */
.actions {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.3rem;
  border: none;
  border-radius: var(--radius-xs);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  position: relative;
  overflow: hidden;
}

.btn svg {
  flex-shrink: 0;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 20px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--bg-2);
  color: var(--text);
  border-color: var(--border-hover);
}

/* ── Stats ── */
.stats {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-3);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
}

.stats span {
  white-space: nowrap;
}

/* ── Footer ── */
footer {
  margin-top: 3rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-3);
  padding-bottom: 2rem;
}

/* ── Disabled select options ── */
select option:disabled {
  color: var(--text-3);
  font-style: italic;
}

/* ── Processing Progress ── */
.processing-indicator {
  text-align: center;
  padding: 0.75rem 0;
}
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-3);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 3px;
  transition: width 0.12s ease-out;
}
.progress-text {
  font-size: 0.82rem;
  color: var(--text-2);
  font-weight: 500;
}
@keyframes progress-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
.processing-indicator .progress-text {
  animation: progress-pulse 1.5s ease-in-out infinite;
}

/* ── Utility ── */
.hidden { display: none !important; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .app { padding: 1.25rem 1rem 2rem; }

  header h1 { font-size: 1.6rem; }
  .logo-icon { width: 28px; height: 28px; }

  .upload-area { padding: 2rem 1rem; }

  .settings-grid { grid-template-columns: 1fr 1fr; }

  .actions {
    flex-direction: column;
  }

  .btn { width: 100%; justify-content: center; }

  .tab { font-size: 0.82rem; padding: 0.6rem 0.5rem; }
  .tab-icon { width: 16px; height: 16px; }
}

@media (max-width: 400px) {
  .settings-grid { grid-template-columns: 1fr; }
}

/* ── Animations ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card, .upload-area {
  animation: fadeIn 0.3s ease-out;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 8px; height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-0);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-3);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-3);
}

/* ── Select option styling (for warnings) ── */
select option {
  background: var(--select-opt-bg, var(--bg-1));
  color: var(--text);
}

/* ── About / Help Tab ── */
.about-card p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.7;
}

.about-card strong {
  color: var(--text);
  font-weight: 600;
}

.about-card em {
  color: var(--accent);
  font-style: normal;
  font-weight: 500;
}

.help-steps {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.help-step {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 28px; height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid rgba(124,111,247,0.2);
  margin-top: 2px;
}

.help-step div > strong {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 0.15rem;
}

.help-step div > p {
  font-size: 0.82rem;
  color: var(--text-3);
  line-height: 1.55;
}

.help-table {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-radius: var(--radius-xs);
  overflow: hidden;
  border: 1px solid var(--border);
}

.help-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  background: var(--bg-0);
  padding: 0.6rem 0.85rem;
  gap: 0.75rem;
  font-size: 0.82rem;
  transition: background var(--transition);
}

.help-row:hover {
  background: var(--bg-2);
}

.help-key {
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}

.help-val {
  color: var(--text-2);
  line-height: 1.5;
}

.help-tips {
  margin-top: 0.5rem;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.help-tips li {
  font-size: 0.85rem;
  color: var(--text-2);
  line-height: 1.6;
}

.help-tips li::marker {
  color: var(--accent);
}

.about-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.about-link:hover {
  border-bottom-color: var(--accent);
}

@media (max-width: 640px) {
  .help-row {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

/* ── Theme Toggle ── */
.theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-1);
  color: var(--text-2);
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
}

.theme-toggle:hover {
  background: var(--bg-2);
  color: var(--text);
  border-color: var(--border-hover);
  transform: rotate(15deg);
}

/* Dark mode: show moon, hide sun */
[data-theme="dark"] .theme-icon.sun,
:root:not([data-theme]) .theme-icon.sun { display: none; }
[data-theme="dark"] .theme-icon.moon,
:root:not([data-theme]) .theme-icon.moon { display: block; }

/* Light mode: show sun, hide moon */
[data-theme="light"] .theme-icon.sun { display: block; }
[data-theme="light"] .theme-icon.moon { display: none; }

/* Light mode tweaks */
[data-theme="light"] .upload-area {
  border-color: var(--border-hover);
}

[data-theme="light"] .tab.active {
  box-shadow: 0 2px 12px var(--accent-glow);
}

[data-theme="light"] .privacy-badge {
  color: var(--green);
  background: rgba(5, 150, 105, 0.08);
  border-color: rgba(5, 150, 105, 0.2);
}

[data-theme="light"] audio {
  filter: none;
}

[data-theme="light"] .field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5l3 3 3-3' stroke='%23555566' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}