:root {
  --sheet-ink: #1c2419;
  --sheet-muted: #5b6756;
  --sheet-line: #d7ddd2;
  --sheet-paper: #f7f4ee;
  --sheet-green: #3d4f3a;
  --sheet-gold: #c4a35a;
}

.sheet-bar,
.sheet-panel,
.sheet-board {
  font-family: "Nunito Sans", "Segoe UI", sans-serif;
  color: var(--sheet-ink);
  box-sizing: border-box;
}

.sheet-bar *,
.sheet-panel *,
.sheet-board * {
  box-sizing: border-box;
}

.sheet-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2147483000;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--sheet-green);
  color: #fff;
  box-shadow: 0 -8px 24px rgba(28, 36, 25, 0.18);
}

.sheet-bar p {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
}

.sheet-bar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sheet-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  background: #fff;
  color: var(--sheet-green);
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.sheet-btn.ghost {
  background: transparent;
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.45);
}

.sheet-board .sheet-btn.ghost,
.sheet-card .sheet-btn.ghost,
.sheet-panel .sheet-btn.ghost,
.sheet-empty .sheet-btn.ghost {
  color: var(--sheet-green);
  box-shadow: inset 0 0 0 1px var(--sheet-line);
}

.sheet-btn:hover {
  filter: brightness(0.97);
}

.sheet-panel {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 2147483001;
  width: min(460px, 100vw);
  height: calc(100vh - 56px);
  display: none;
  flex-direction: column;
  background: var(--sheet-paper);
  border-left: 1px solid var(--sheet-line);
  box-shadow: -12px 0 32px rgba(28, 36, 25, 0.12);
}

.sheet-panel.open {
  display: flex;
}

.sheet-panel header,
.sheet-panel footer {
  padding: 16px 18px;
  border-bottom: 1px solid var(--sheet-line);
}

.sheet-panel footer {
  border-bottom: 0;
  border-top: 1px solid var(--sheet-line);
}

.sheet-panel h2,
.sheet-board h1,
.sheet-board h2 {
  margin: 0 0 6px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
}

.sheet-panel p,
.sheet-board .lead {
  margin: 0;
  color: var(--sheet-muted);
  line-height: 1.5;
}

.sheet-panel-body {
  flex: 1;
  overflow: auto;
  padding: 16px 18px 88px;
}

.sheet-list {
  display: grid;
  gap: 10px;
  margin: 16px 0;
}

.sheet-card {
  padding: 14px;
  border: 1px solid var(--sheet-line);
  border-radius: 14px;
  background: #fff;
}

.sheet-card.active {
  border-color: var(--sheet-green);
  box-shadow: 0 0 0 3px rgba(61, 79, 58, 0.12);
}

.sheet-card h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

.sheet-card p {
  margin: 0 0 10px;
  font-size: 13px;
}

.sheet-card .sheet-btn {
  background: var(--sheet-green);
  color: #fff;
  margin: 0 6px 6px 0;
}

.sheet-card .sheet-btn.ghost {
  background: transparent;
  color: var(--sheet-green);
  box-shadow: inset 0 0 0 1px var(--sheet-line);
}

.sheet-frame {
  width: 100%;
  min-height: 320px;
  height: 42vh;
  border: 1px solid var(--sheet-line);
  border-radius: 12px;
  background: #fff;
}

.sheet-board {
  min-height: 100vh;
  padding: 28px 20px 40px;
  background: linear-gradient(180deg, #eef2ea, var(--sheet-paper) 180px);
}

.sheet-board .wrap {
  max-width: 1180px;
  margin: 0 auto;
}

.sheet-board-top {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 24px;
}

.sheet-grid {
  display: grid;
  gap: 18px;
}

@media (min-width: 900px) {
  .sheet-grid {
    grid-template-columns: 340px 1fr;
    align-items: start;
  }

  .sheet-frame {
    min-height: 70vh;
    height: 70vh;
  }
}

.sheet-empty {
  padding: 28px;
  border: 1px dashed var(--sheet-line);
  border-radius: 16px;
  background: #fff;
}

.sheet-empty h2 {
  margin-top: 0;
}

.sheet-empty .sheet-bar-actions {
  margin: 16px 0 0;
}

.sheet-empty .sheet-btn {
  background: var(--sheet-green);
  color: #fff;
}

.sheet-empty .sheet-btn.ghost {
  background: transparent;
  color: var(--sheet-green);
  box-shadow: inset 0 0 0 1px var(--sheet-line);
}

body.has-sheet-bar {
  padding-bottom: 64px;
}