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

:root {
  --bg: #0f0f13;
  --surface: #1a1a24;
  --surface2: #22222f;
  --border: #2e2e3e;
  --accent: #7c5cfc;
  --accent-hover: #6a4aec;
  --text: #e8e8f0;
  --muted: #888899;
  --success: #4ade80;
  --radius: 12px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  padding: 24px 16px 60px;
}

header {
  text-align: center;
  margin-bottom: 40px;
}

.logo {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--muted);
}

.logo span {
  color: var(--accent);
}

.tagline {
  color: var(--muted);
  margin-top: 6px;
  font-size: 0.95rem;
}

main {
  max-width: 860px;
  margin: 0 auto;
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent);
  background: rgba(124, 92, 252, 0.05);
}

.upload-icon { font-size: 3rem; margin-bottom: 12px; }
.upload-zone p { color: var(--muted); }
.link { color: var(--accent); cursor: pointer; text-decoration: underline; }
.hint { font-size: 0.8rem; margin-top: 8px; }

/* Editor */
.editor {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

@media (max-width: 600px) {
  .editor { grid-template-columns: 1fr; }
}

.preview-panel {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.preview-panel img {
  width: 100%;
  height: 260px;
  object-fit: contain;
  border-radius: 8px;
  background: var(--surface2);
}

.file-info {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.6;
}

/* Controls */
.controls-panel {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tabs {
  display: flex;
  gap: 6px;
  background: var(--surface2);
  padding: 4px;
  border-radius: 8px;
}

.tab {
  flex: 1;
  padding: 8px;
  border: none;
  background: transparent;
  color: var(--muted);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.15s;
}

.tab.active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

.panel { display: none; flex-direction: column; gap: 10px; }
.panel.active { display: flex; }

label {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

input[type="number"], select {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 0.95rem;
}

input[type="number"]:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn-process {
  margin-top: auto;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 14px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-process:hover { background: var(--accent-hover); }
.btn-process:active { transform: scale(0.98); }
.btn-process:disabled { opacity: 0.5; cursor: not-allowed; }

/* Result */
.result {
  margin-top: 24px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.result-stats {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.8;
}

.result-stats .savings {
  color: var(--success);
  font-weight: 700;
  font-size: 1.4rem;
}

.btn-download {
  background: var(--success);
  color: #0f0f13;
  padding: 14px 36px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  transition: opacity 0.2s;
}

.btn-download:hover { opacity: 0.85; }

.btn-reset {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 10px 24px;
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.btn-reset:hover { border-color: var(--accent); color: var(--text); }

/* Spinner */
.btn-process.loading::after {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid #fff;
  border-top-color: transparent;
  border-radius: 50%;
  margin-left: 10px;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
}

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