:root {
  --bg: #0b0d12;
  --panel: #141821;
  --line: #2a3140;
  --text: #e8edf7;
  --muted: #93a0b8;
  --accent: #6ee7c5;
  --primary: #7aa2ff;
  --danger: #ff8b8b;
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(1200px 600px at 10% -10%, #1a2438 0%, var(--bg) 55%);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 16px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.logo {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  box-shadow: 0 8px 24px rgba(122, 162, 255, 0.28);
}

h1,
h2 {
  margin: 0;
  font-size: 20px;
}

.brand p,
.muted,
.empty span {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.top-actions,
.custom,
.presets,
.meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn,
.file-btn {
  border: 1px solid var(--line);
  background: #1b2230;
  color: var(--text);
  border-radius: 999px;
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
  touch-action: manipulation;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: #223056;
  border-color: #3a4e86;
}

.btn-accent {
  background: linear-gradient(135deg, #59d2b0, #6aa4ff);
  color: #081018;
  border: 0;
  font-weight: 700;
}

.file-btn input {
  display: none;
}

.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  min-height: 0;
}

.stage-wrap,
.panel {
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.stage-wrap {
  min-height: 62vh;
  padding: 12px;
}

.dropzone {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 58vh;
  overflow: hidden;
  border-radius: 12px;
  background: repeating-conic-gradient(#121722 0 25%, #171e2a 0 50%) 0 0 / 28px 28px;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  pointer-events: none;
  padding: 24px;
}

.panel {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.presets button {
  border: 1px solid var(--line);
  background: #1a2130;
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  min-width: 92px;
  cursor: pointer;
}

.presets button.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent) inset;
}

.custom label {
  display: grid;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.custom input {
  width: 96px;
  background: #0f141d;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 10px;
  padding: 10px;
  font-size: 16px;
}

.times {
  align-self: end;
  padding-bottom: 10px;
  color: var(--muted);
}

.meta {
  flex-direction: column;
  background: #10151e;
  border-radius: 12px;
  padding: 12px;
}

.meta div {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
}

.meta span {
  color: var(--muted);
}

.check {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 860px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .stage-wrap,
  .dropzone {
    min-height: 48vh;
  }
}