:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --border: #d9dce3;
  --text: #111827;
  --muted: #6b7280;
  --primary: #0f172a;
  --primary-2: #1d4ed8;
  --danger: #b91c1c;
  --soft: #eef2ff;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: linear-gradient(180deg, #f8fafc, #eef2f7);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input, textarea, select { font: inherit; }
.app-shell { max-width: 1600px; margin: 0 auto; padding: 24px; }
.topbar { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; margin-bottom: 20px; }
.eyebrow { color: var(--primary-2); font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
h1 { margin: 8px 0 10px; font-size: 38px; line-height: 1.05; }
.subtitle { margin: 0; max-width: 850px; color: var(--muted); line-height: 1.6; }
.topbar-actions { display: flex; gap: 12px; align-items: center; }
.badge { padding: 10px 14px; border-radius: 999px; border: 1px solid var(--border); font-size: 13px; }
.badge.soft { background: #f8fafc; }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-bottom: 18px; }
.stat-card, .panel { background: var(--panel); border: 1px solid var(--border); border-radius: 22px; box-shadow: var(--shadow); }
.stat-card { padding: 18px; }
.stat-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.stat-value { font-size: 32px; font-weight: 700; margin-top: 8px; }
.main-grid { display: grid; grid-template-columns: 380px 1fr; gap: 18px; align-items: start; }
.sidebar { padding: 14px; position: sticky; top: 16px; }
.sidebar-top { margin-bottom: 12px; }
.input { width: 100%; border: 1px solid var(--border); background: #fff; color: var(--text); padding: 12px 14px; border-radius: 14px; }
.select { appearance: none; }
.textarea { resize: vertical; min-height: 120px; }
.project-list { display: grid; gap: 10px; max-height: calc(100vh - 260px); overflow: auto; padding-right: 4px; }
.project-card { border: 1px solid var(--border); border-radius: 18px; padding: 14px; background: #fff; cursor: pointer; }
.project-card.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.project-card h3 { margin: 0 0 8px; font-size: 16px; }
.project-card .meta { font-size: 13px; color: inherit; opacity: .82; line-height: 1.5; }
.project-card .row { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 8px; }
.workspace { min-height: 860px; padding: 16px; }
.empty-state { padding: 90px 24px; text-align: center; color: var(--muted); }
.workspace-content.hidden { display: none; }
.workspace-header { display: flex; justify-content: space-between; gap: 18px; align-items: flex-start; margin-bottom: 16px; }
.workspace-header h2 { margin: 0 0 8px; font-size: 28px; }
.workspace-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn { border: 1px solid var(--border); background: #fff; color: var(--text); padding: 11px 16px; border-radius: 14px; cursor: pointer; }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.danger { color: var(--danger); border-color: #f1b7b7; }
.muted { color: var(--muted); }
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.tab { padding: 10px 14px; border-radius: 999px; border: 1px solid var(--border); background: #fff; cursor: pointer; }
.tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.form-grid.compact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 13px; font-weight: 600; color: #334155; }
.field.full { grid-column: 1 / -1; }
.upload-box, .panel-toolbar, .pdf-actions { display: flex; justify-content: space-between; gap: 14px; align-items: center; }
.upload-box { margin-top: 18px; padding: 16px; border: 1px dashed var(--border); border-radius: 18px; background: #fafcff; }
.upload-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.file-list { display: grid; gap: 10px; margin-top: 12px; }
.file-item { padding: 12px 14px; border: 1px solid var(--border); border-radius: 16px; display: flex; justify-content: space-between; gap: 10px; align-items: center; background: #fff; }
.code-box { margin: 0; padding: 18px; border-radius: 18px; background: #0f172a; color: #e5e7eb; border: 1px solid #0f172a; min-height: 520px; white-space: pre-wrap; overflow: auto; line-height: 1.6; }
.code-box.light { background: #f8fafc; color: #111827; border-color: var(--border); }
.pdf-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: stretch; }
.pdf-card { border: 1px solid var(--border); border-radius: 18px; padding: 18px; background: #fff; }
.dialog { border: none; border-radius: 24px; padding: 0; max-width: 700px; width: calc(100% - 32px); }
.dialog::backdrop { background: rgba(15, 23, 42, 0.45); }
.dialog-card { padding: 18px; }
.dialog-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
.icon-btn { border: none; background: transparent; font-size: 20px; cursor: pointer; }
.status-pill { font-size: 12px; padding: 6px 10px; border-radius: 999px; background: #eef2ff; }
.small-btn { padding: 8px 10px; border-radius: 10px; }
.hidden { display: none; }
@media (max-width: 1200px) {
  .main-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; }
}
@media (max-width: 900px) {
  .stats-grid, .pdf-actions, .form-grid, .form-grid.compact { grid-template-columns: 1fr; }
  .topbar, .workspace-header, .upload-box, .panel-toolbar { flex-direction: column; align-items: stretch; }
}