:root {
  color-scheme: dark;
  --bg: #0d1112;
  --panel: #151b1d;
  --panel-raised: #1b2325;
  --input: #101617;
  --text: #f3f7f7;
  --muted: #99a8ac;
  --line: #2b3639;
  --line-strong: #3b4a4d;
  --teal: #18a7a8;
  --teal-dark: #9af1ed;
  --amber: #f0a72f;
  --soft-teal: #123637;
  --soft-amber: #352718;
  --shadow: 0 18px 52px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% -10%, rgba(24, 167, 168, 0.16), transparent 32%),
    radial-gradient(circle at 86% 4%, rgba(240, 167, 47, 0.1), transparent 28%),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 24px 18px;
}

.topbar h1,
.panel h2,
.settings h3 {
  margin: 0;
  letter-spacing: 0;
}

.topbar h1 {
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 0.95;
}

.topbar p,
.panel-heading p,
#statusText,
.empty-preview p {
  margin: 6px 0 0;
  color: var(--muted);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(360px, 0.85fr) minmax(420px, 1.15fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px 28px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  min-width: 0;
}

.source-panel,
.preview-panel {
  padding: 20px;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.panel h2 {
  font-size: 1.35rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 72px;
  min-height: 32px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--soft-teal);
  color: var(--teal-dark);
  font-size: 0.86rem;
  font-weight: 700;
  white-space: nowrap;
}

.dropzone {
  display: grid;
  place-items: center;
  gap: 8px;
  min-height: 190px;
  padding: 24px;
  border: 1.5px dashed var(--line-strong);
  border-radius: 8px;
  background: linear-gradient(180deg, #141b1d 0%, #101718 100%);
  color: var(--text);
  text-align: center;
  cursor: pointer;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

.dropzone.dragging {
  border-color: var(--teal);
  background: #143f40;
  transform: translateY(-1px);
}

.dropzone input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

.drop-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--teal);
  color: white;
  font-size: 2rem;
  line-height: 1;
}

.dropzone strong {
  font-size: 1.05rem;
}

.dropzone small {
  max-width: 34ch;
  color: var(--muted);
  line-height: 1.45;
}

.file-list {
  display: grid;
  gap: 8px;
  margin: 14px 0 18px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--input);
}

.file-item strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.95rem;
}

.file-item span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.84rem;
}

.settings {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-raised);
}

.settings h3 {
  font-size: 1rem;
  margin-bottom: 12px;
}

.preset-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}

.preset-button,
.ghost-button,
.primary-button,
.download-button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--input);
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.preset-button.active {
  border-color: var(--teal);
  background: var(--soft-teal);
  color: var(--teal-dark);
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.control-grid label {
  display: grid;
  gap: 6px;
}

.full-control {
  grid-column: 1 / -1;
}

.control-grid span,
.check-row span {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  background: var(--input);
  color: var(--text);
}

input::placeholder {
  color: #718186;
}

input[type="range"] {
  padding-inline: 0;
  accent-color: var(--teal);
}

.check-row {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 14px;
}

.check-row input {
  width: 18px;
  min-height: 18px;
  accent-color: var(--teal);
}

.action-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 16px;
}

.primary-button,
.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-color: var(--teal);
  background: var(--teal);
  color: #061313;
}

.primary-button:disabled,
.download-button.disabled {
  border-color: var(--line);
  background: #202a2d;
  color: #768589;
  cursor: not-allowed;
  pointer-events: none;
}

.ghost-button {
  padding: 0 16px;
}

.progress {
  height: 8px;
  margin-top: 14px;
  overflow: hidden;
  border-radius: 999px;
  background: #243034;
}

.progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--amber));
  transition: width 180ms ease;
}

.preview-stage {
  display: grid;
  place-items: center;
  min-height: 500px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(45deg, #202a2d 25%, transparent 25%),
    linear-gradient(-45deg, #202a2d 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #202a2d 75%),
    linear-gradient(-45deg, transparent 75%, #202a2d 75%),
    #151c1f;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
  background-size: 24px 24px;
}

#gifPreview {
  max-width: 100%;
  max-height: 500px;
  object-fit: contain;
}

.empty-preview {
  display: grid;
  place-items: center;
  gap: 8px;
  color: var(--muted);
}

.empty-preview span {
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft-amber);
  color: #ffc96f;
  font-weight: 900;
}

.source-preview {
  margin-top: 14px;
}

.source-preview img,
.source-preview video {
  width: 100%;
  max-height: 190px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #101617;
  object-fit: contain;
}

@media (max-width: 900px) {
  .topbar {
    align-items: flex-start;
    padding-inline: 16px;
  }

  .workspace {
    grid-template-columns: 1fr;
    padding-inline: 16px;
  }

  .preview-stage {
    min-height: 360px;
  }
}

@media (max-width: 560px) {
  .topbar,
  .panel-heading,
  .action-row {
    flex-direction: column;
    align-items: stretch;
  }

  .control-grid,
  .preset-row {
    grid-template-columns: 1fr;
  }
}