:root {
  --bg: #f5f7fb;
  --panel: rgba(255,255,255,.8);
  --text: #18212f;
  --muted: #5d6b82;
  --line: rgba(24,33,47,.08);
  --accent: #2563eb;
  --accent-soft: rgba(37,99,235,.12);
  --shadow: 0 20px 60px rgba(15, 23, 42, .08);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: 'DM Sans', 'Segoe UI', sans-serif; background: radial-gradient(circle at top left, rgba(37,99,235,.12), transparent 28%), var(--bg); color: var(--text); }
.main-shell { max-width: 1480px; margin: 0 auto; padding: 32px; }
.topbar, .panel, .hero { background: var(--panel); backdrop-filter: blur(18px); border: 1px solid var(--line); box-shadow: var(--shadow); }
.topbar { border-radius: 24px; padding: 20px 24px; display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.brand-title { font-size: 20px; font-weight: 700; }
.brand-sub, .muted { color: var(--muted); }
.nav { display: flex; gap: 12px; }
.nav a { text-decoration: none; color: var(--text); padding: 10px 14px; border-radius: 999px; background: rgba(255,255,255,.55); }
.hero { border-radius: 32px; padding: 32px; display: grid; grid-template-columns: 1.2fr .8fr; gap: 24px; margin-bottom: 24px; }
.hero h1 { font-family: 'Instrument Serif', serif; font-size: 54px; line-height: 1.02; margin: 0 0 16px; font-weight: 400; }
.hero p { font-size: 16px; line-height: 1.7; max-width: 70ch; }
.hero-card, .subpanel, .status-card, .result-card, .plan-item, .log-item, .timeline-item, .upload-card, .layer-item, .fallback-box { background: rgba(255,255,255,.88); border: 1px solid var(--line); border-radius: 20px; }
.hero-card, .panel, .subpanel, .plan-item, .log-item, .timeline-item, .status-card, .result-card, .layer-item, .fallback-box { padding: 16px; }
.workspace-grid { display: grid; grid-template-columns: 340px 1fr 380px; gap: 20px; }
.panel { border-radius: 24px; }
.panel-main { min-height: 920px; }
.stack, .plan-list, .log-list, .result-list, .layer-list, .timeline-list, .status-cards, .stack-sm { display: grid; gap: 12px; }
.section-title { font-size: 16px; font-weight: 700; margin-bottom: 12px; }
.label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 8px; }
.input, .textarea, .select { width: 100%; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.94); color: var(--text); padding: 14px 16px; font: inherit; outline: none; }
.input:focus, .textarea:focus, .select:focus { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.textarea { min-height: 112px; resize: vertical; }
.button-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.btn { border: 0; border-radius: 16px; padding: 14px 18px; font: inherit; font-weight: 700; cursor: pointer; }
.btn-primary { background: var(--accent); color: white; }
.btn-secondary { background: rgba(255,255,255,.92); color: var(--text); border: 1px solid var(--line); }
.badge { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; color: var(--accent); background: var(--accent-soft); border-radius: 999px; padding: 7px 10px; }
.dual-grid, .upload-grid, .status-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.upload-card { position: relative; min-height: 156px; display: grid; gap: 10px; border-style: dashed; }
.upload-card input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.upload-title { font-weight: 700; }
.upload-preview { min-height: 90px; border-radius: 14px; background: rgba(37,99,235,.06); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.upload-preview img { width: 100%; height: 100%; object-fit: cover; display: block; }
.upload-preview.has-image { background: white; }
.toolbar-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.segmented { display: inline-flex; gap: 8px; padding: 6px; border-radius: 999px; background: rgba(255,255,255,.8); border: 1px solid var(--line); }
.segmented button { border: 0; background: transparent; padding: 10px 14px; border-radius: 999px; font: inherit; cursor: pointer; }
.segmented-active { background: white !important; box-shadow: 0 8px 24px rgba(15,23,42,.08); }
.phase-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.phase { border-radius: 18px; padding: 14px; background: rgba(255,255,255,.65); border: 1px solid var(--line); display: grid; gap: 8px; opacity: .55; transition: .2s ease; }
.phase strong { font-size: 13px; color: var(--muted); }
.phase.active { background: rgba(37,99,235,.1); border-color: rgba(37,99,235,.22); opacity: 1; }
.three-column { display: grid; grid-template-columns: 1.15fr 1fr .85fr; gap: 16px; }
.subpanel-title { font-size: 14px; font-weight: 700; margin-bottom: 12px; }
.timeline-item { display: grid; grid-template-columns: 86px 1fr; gap: 12px; align-items: start; }
.time { font-size: 12px; color: var(--muted); font-weight: 700; }
.status-card strong { display: block; margin-top: 8px; font-size: 22px; }
.canvas-board { border-radius: 28px; min-height: 420px; padding: 18px; background: linear-gradient(145deg, #eef4ff, #fdfcff 45%, #fff4e8); border: 1px solid rgba(37,99,235,.08); }
.canvas-safe-area { height: 100%; min-height: 384px; border-radius: 22px; position: relative; overflow: hidden; padding: 28px; display: flex; flex-direction: column; justify-content: flex-end; background: radial-gradient(circle at 70% 30%, rgba(255,255,255,.9), transparent 28%), linear-gradient(135deg, #dbeafe 0%, #fef3c7 100%); }
.canvas-badge { position: absolute; top: 20px; right: 20px; font-size: 12px; font-weight: 700; padding: 8px 10px; border-radius: 999px; background: rgba(255,255,255,.88); }
.canvas-title { font-size: 44px; line-height: 1; font-weight: 800; max-width: 6ch; }
.canvas-subtitle { margin-top: 10px; font-size: 16px; color: rgba(24,33,47,.72); }
.canvas-cta { margin-top: 20px; display: inline-flex; align-self: flex-start; padding: 12px 16px; border-radius: 999px; background: rgba(24,33,47,.9); color: white; font-weight: 700; }
.layer-item { display: flex; justify-content: space-between; gap: 12px; }
.result-card { min-height: 96px; background-position: center; background-size: cover; }
.result-card.large { min-height: 112px; }
@media (max-width: 1280px) { .workspace-grid, .three-column, .hero { grid-template-columns: 1fr; } }