:root {
  --border: #c9ccd1;
  --border-strong: #8a8f98;
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #22242a;
  --accent: #2f6fed;
  --accent-dark: #1e4fb8;
  --danger: #d64545;
  --ok: #1f9d55;
  --sat: #cfe8ff;
  --sun: #ffdcb0;
  --blank: #ececec;
  --cell-w: 20px;
  --row-h: 26px;
  --label-w: 200px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Yu Gothic", "Meiryo", "Hiragino Sans", "Segoe UI", sans-serif;
  font-size: 13px;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------- Toolbar ---------- */
.toolbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 16px;
  background: #1f2430;
  color: #fff;
  flex-wrap: wrap;
}

.toolbar-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.toolbar-group {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid #444a58;
  background: #2b3140;
  color: #fff;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12.5px;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover { background: #3a4256; }

.btn-accent {
  background: var(--accent);
  border-color: var(--accent-dark);
}
.btn-accent:hover { background: var(--accent-dark); }

.btn-danger {
  background: #4a2323;
  border-color: var(--danger);
}
.btn-danger:hover { background: var(--danger); }

.palette-bar {
  position: sticky;
  top: 42px;
  z-index: 49;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: #eef0f4;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.palette-label { font-size: 12.5px; color: #555; }

.palette {
  display: flex;
  gap: 4px;
}

.swatch {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
}
.swatch.selected {
  border-color: #222;
  box-shadow: 0 0 0 2px #fff inset;
}

.tool-btn.selected {
  outline: 2px solid #222;
}

.custom-color {
  width: 30px;
  height: 26px;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0;
  cursor: pointer;
}

.conn-status {
  font-size: 12px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 12px;
  white-space: nowrap;
}
.conn-online {
  color: var(--ok);
  background: #e4f7ec;
}
.conn-offline {
  color: #8a6d1c;
  background: #fff4d6;
}
.conn-connecting {
  color: #555;
  background: #eee;
}

.share-status {
  margin-left: auto;
  font-size: 12px;
  color: var(--accent-dark);
  font-weight: 600;
}

/* ---------- Main / Header sheet ---------- */
main {
  flex: 1;
  padding: 12px 16px 32px;
}

.sheet-header {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 14px;
}

.sh-title-row {
  text-align: center;
  margin-bottom: 10px;
}

.sh-maintitle {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.4em;
}

.sh-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px 14px;
}

.sh-field {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  background: #fafbfc;
}

.sh-wide { grid-column: span 2; }

.sh-period { grid-column: span 2; }

.sh-label {
  font-size: 11.5px;
  color: #555;
  white-space: nowrap;
  flex: 0 0 auto;
}

.sh-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 13px;
  padding: 3px 4px;
  min-width: 0;
  color: var(--text);
}
.sh-input:focus { outline: 1px solid var(--accent); border-radius: 3px; }

.sh-date { flex: 1 1 auto; }
.sh-tilde { flex: 0 0 auto; color: #777; }

/* ---------- Gantt ---------- */
.gantt-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  margin-bottom: 18px;
  overflow: hidden;
}

.gantt-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
}

#gantt-table {
  border-collapse: collapse;
  table-layout: fixed;
}

#gantt-table th, #gantt-table td {
  border: 1px solid var(--border);
  padding: 0;
  text-align: center;
  font-size: 10.5px;
  height: var(--row-h);
}

.th-label, .td-label {
  position: sticky;
  left: 0;
  z-index: 5;
  width: var(--label-w);
  min-width: var(--label-w);
  max-width: var(--label-w);
  background: #f2f3f5;
  text-align: left;
  padding: 2px 6px !important;
}

.td-label { z-index: 4; }

.item-row-inner {
  display: flex;
  align-items: center;
  gap: 4px;
}

.item-name-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 12px;
  min-width: 0;
  padding: 2px 2px;
}
.item-name-input:focus { outline: 1px solid var(--accent); }

.item-name-input.bold { font-weight: 700; }

.row-btn {
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 11px;
  color: #888;
  padding: 0 2px;
  line-height: 1;
}
.row-btn:hover { color: var(--danger); }

.th-month, .th-day, .th-weekday {
  background: #f7f8fa;
  font-weight: 600;
  color: #444;
}

.th-month { white-space: nowrap; }

.day-col {
  width: var(--cell-w);
  min-width: var(--cell-w);
  max-width: var(--cell-w);
}

.td-sat { background: var(--sat); }
.td-sun { background: var(--sun); }
.td-blank { background: var(--blank); }

.gantt-cell {
  cursor: pointer;
  user-select: none;
}
.gantt-cell:hover { outline: 1px solid var(--accent); outline-offset: -1px; }

/* ---------- Progress / S-curve ---------- */
.progress-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
}

.section-title {
  font-size: 14px;
  margin: 0 0 10px;
}

.progress-table-scroll {
  overflow-x: auto;
  margin-bottom: 12px;
}

#progress-table {
  border-collapse: collapse;
}

#progress-table th, #progress-table td {
  border: 1px solid var(--border);
  padding: 3px 6px;
  font-size: 11.5px;
  text-align: center;
  white-space: nowrap;
}

#progress-table th { background: #f2f3f5; }

#progress-table input {
  width: 52px;
  border: 1px solid var(--border);
  border-radius: 3px;
  text-align: center;
  font-size: 11.5px;
  padding: 2px;
}

.chart-box {
  background: #fdfdfe;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  overflow-x: auto;
}

#progress-canvas { display: block; }

/* ---------- Footer ---------- */
.hint {
  padding: 8px 16px 14px;
  font-size: 11.5px;
  color: #666;
  text-align: center;
}

/* ---------- Print ---------- */
@media print {
  @page { size: A3 landscape; margin: 8mm; }
  body { background: #fff; font-size: 9px; }
  .no-print { display: none !important; }
  .app { min-height: 0; }
  main { padding: 0; }
  .sheet-header, .gantt-wrap, .progress-wrap {
    border: none;
    box-shadow: none;
    page-break-inside: avoid;
  }
  .gantt-scroll { overflow: visible; }
  :root { --cell-w: 8px; --row-h: 16px; --label-w: 110px; }
}

@media (max-width: 700px) {
  .sh-grid { grid-template-columns: repeat(2, 1fr); }
  .sh-wide, .sh-period { grid-column: span 2; }
}