:root {
    color-scheme: dark;
    --bg: #0c1117;
    --panel: #141b23;
    --panel-2: #1a222c;
    --line: #2a3542;
    --text: #edf3f8;
    --muted: #99a9b8;
    --accent: #33d6a6;
    --accent-dark: #1ba57f;
    --danger: #e06464;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top right, #172431 0, var(--bg) 45%);
    color: var(--text);
}
button, input { font: inherit; }
button {
    border: 1px solid transparent;
    border-radius: 10px;
    padding: 10px 14px;
    background: var(--accent);
    color: #052219;
    font-weight: 750;
    cursor: pointer;
}
button:hover { filter: brightness(1.07); }
button:disabled { opacity: .45; cursor: not-allowed; }
button.secondary { background: transparent; color: var(--text); border-color: var(--line); }
button.danger { background: transparent; color: #ff9494; border-color: #723b3b; }
button.block { width: 100%; margin-top: 10px; }

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: center;
    padding: 24px 32px;
    border-bottom: 1px solid var(--line);
    background: rgba(12, 17, 23, .78);
    backdrop-filter: blur(16px);
}
.topbar h1 { margin: 4px 0 6px; font-size: clamp(24px, 3vw, 38px); }
.topbar p { margin: 0; color: var(--muted); }
.eyebrow { color: var(--accent); font-size: 12px; letter-spacing: .15em; font-weight: 800; }

.layout {
    display: grid;
    grid-template-columns: 360px minmax(0, 1fr);
    gap: 22px;
    padding: 22px;
    max-width: 1600px;
    margin: 0 auto;
}
.panel, .workspace {
    background: rgba(20, 27, 35, .92);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, .22);
}
.controls { padding: 18px; }
.controls section { padding: 4px 0 20px; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.controls section:last-child { border: 0; margin-bottom: 0; padding-bottom: 0; }
h2 { font-size: 16px; margin: 0 0 12px; }
.help, .note { color: var(--muted); line-height: 1.5; font-size: 13px; }

.angle-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-bottom: 12px; }
.angle { padding: 9px 4px; background: var(--panel-2); color: var(--muted); border-color: var(--line); }
.angle.active { background: var(--accent); color: #052219; border-color: var(--accent); }
.angle.has-image::after { content: "•"; margin-left: 3px; }
.upload-box {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 18px;
    border: 1px dashed #496070;
    border-radius: 13px;
    cursor: pointer;
    background: rgba(255,255,255,.02);
}
.upload-box:hover { border-color: var(--accent); }
.upload-box input { display: none; }
.upload-box span { color: var(--muted); font-size: 12px; }
.status { min-height: 20px; font-size: 12px; margin-top: 8px; color: var(--muted); }
.status.ok { color: var(--accent); }
.status.error { color: #ff8b8b; }
.button-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.controls label:not(.upload-box) { display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: center; margin: 13px 0; font-size: 13px; }
.controls input[type="range"] { grid-column: 1 / -1; width: 100%; accent-color: var(--accent); }
.controls input[type="color"] { width: 50px; height: 32px; border: 1px solid var(--line); border-radius: 8px; background: transparent; padding: 2px; }
output { color: var(--accent); font-variant-numeric: tabular-nums; }
.download { display: block; margin-top: 12px; color: var(--accent); text-align: center; }
.hidden { display: none !important; }

.workspace { padding: 14px; min-width: 0; }
.canvas-toolbar { display: flex; justify-content: space-between; padding: 6px 4px 12px; color: var(--muted); font-size: 13px; }
.canvas-wrap {
    position: relative;
    min-height: 540px;
    display: grid;
    place-items: center;
    overflow: hidden;
    background-color: #090d12;
    background-image: linear-gradient(45deg, #111820 25%, transparent 25%), linear-gradient(-45deg, #111820 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #111820 75%), linear-gradient(-45deg, transparent 75%, #111820 75%);
    background-size: 24px 24px;
    background-position: 0 0, 0 12px, 12px -12px, -12px 0;
    border-radius: 12px;
    border: 1px solid var(--line);
}
canvas { max-width: 100%; max-height: 76vh; display: block; cursor: crosshair; }
.empty-state { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; gap: 6px; color: var(--muted); pointer-events: none; }
.empty-state strong { color: var(--text); font-size: 20px; }
.note { margin: 12px 4px 2px; }

@media (max-width: 900px) {
    .topbar { padding: 18px; align-items: flex-start; }
    .layout { grid-template-columns: 1fr; padding: 12px; }
    .controls { order: 2; }
    .workspace { order: 1; }
    .canvas-wrap { min-height: 380px; }
}