@import url('https://fonts.googleapis.com/css2?family=M+PLUS+Rounded+1c:wght@700;800&display=swap');

:root {
  --accent: #3a7bd5;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Hiragino Kaku Gothic Pro', 'Meiryo', sans-serif;
  background: #f0f2f5; color: #222;
}

/* ===== app layout ===== */
.app { display: flex; height: 100vh; overflow: hidden; }

/* ===== left panel ===== */
.panel {
  width: 260px; min-width: 220px;
  background: #fff; border-right: 1px solid #ddd;
  padding: 16px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 12px;
}
.panel h2 { font-size: 14px; font-weight: 700; color: #555; letter-spacing: .05em; }
.panel-section { display: flex; flex-direction: column; gap: 6px; }
.panel-section label { font-size: 13px; font-weight: 600; color: #333; }
.panel-section select,
.panel-section input[type=number] {
  width: 100%; padding: 6px 8px;
  border: 1px solid #ccc; border-radius: 6px;
  font-size: 13px; background: #fafafa;
}
.panel-section select:focus,
.panel-section input:focus { outline: none; border-color: var(--accent); }

.check-group { display: flex; flex-direction: column; gap: 5px; }
.check-row {
  display: flex; align-items: center; gap: 7px;
  font-size: 13px; cursor: pointer; user-select: none;
}
.orient-group-label {
  font-size: 12px; font-weight: 700; color: #555;
  padding: 4px 0 2px; border-top: 1px solid #eee; margin-top: 2px;
}
.check-row input[type=checkbox] {
  width: 15px; height: 15px; cursor: pointer;
  accent-color: var(--accent); flex-shrink: 0;
}

.toggle-row { display: flex; align-items: center; justify-content: space-between; }
.toggle-row span { font-size: 13px; }
.toggle { position: relative; width: 40px; height: 22px; }
.toggle input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; inset: 0;
  background: #ccc; border-radius: 22px; cursor: pointer; transition: background .2s;
}
.slider::before {
  content: ''; position: absolute; left: 3px; top: 3px;
  width: 16px; height: 16px; background: #fff; border-radius: 50%; transition: transform .2s;
}
.toggle input:checked + .slider { background: var(--accent); }
.toggle input:checked + .slider::before { transform: translateX(18px); }


.btn {
  width: 100%; padding: 9px; border: none; border-radius: 8px;
  font-size: 14px; font-weight: 600; cursor: pointer; transition: opacity .15s;
}
.btn:hover { opacity: .85; }
.btn-primary { background: var(--accent); color: #fff; }

.divider { border: none; border-top: 1px solid #eee; }

/* ===== top-right navigation ===== */
.top-btns {
  position: fixed; top: 16px; right: 20px; z-index: 200;
  display: flex; gap: 8px;
}
.top-btn {
  padding: 8px 18px; border: none; border-radius: 8px;
  font-size: 13px; font-weight: 600; cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
  transition: opacity .15s, transform .1s;
}
.top-btn:hover   { opacity: .88; }
.top-btn:active  { transform: translateY(1px); }
.top-btn:disabled { opacity: .4; cursor: default; transform: none; }
.top-btn-settings { background: #fff; color: #333; }
.top-btn-settings.current { background: #e8edf2; color: #555; box-shadow: none; cursor: default; }
.top-btn-preview  { background: #e67e22; color: #fff; }
.top-btn-print    { background: #27ae60; color: #fff; }
.top-btn-answer   { background: #f0f2f5; color: #333; }
.top-btn-answer.active { background: #2ecc71; color: #fff; }
@media print { .top-btns { display: none; } }

/* ===== preview area ===== */
.preview-area {
  flex: 1; overflow: auto; padding: 24px;
  display: flex; flex-direction: column; align-items: center;
}
.sheet-wrapper { flex-shrink: 0; }
#sheetsContainer { display: flex; flex-direction: column; align-items: center; gap: 20px; }

/* ===== A4 print sheet ===== */
.print-sheet {
  background: #fff; width: 210mm; height: 297mm;
  overflow: hidden; padding: 12mm 15mm;
  box-shadow: 0 2px 12px rgba(0,0,0,.12);
  transform-origin: top left;
}

/* ===== sheet header ===== */
.sheet-header { display: flex; align-items: flex-end; gap: 16px; margin-bottom: 4mm; }
.sheet-title {
  flex: 1; outline: none;
  font-family: 'M PLUS Rounded 1c', 'Hiragino Maru Gothic Pro', sans-serif;
  font-size: 26px; font-weight: 800; line-height: 1.2;
}
.sheet-title[contenteditable="true"]:empty::before {
  content: attr(data-placeholder); color: #bbb;
}
.header-field { display: flex; align-items: flex-end; gap: 4px; font-size: 18px; white-space: nowrap; }
.header-field .line { display: inline-block; width: 60px; border-bottom: 1px solid #333; }
.header-field .name-line { width: 70mm; }

/* ===== instruction area ===== */
.sheet-instruction {
  min-height: 6mm; margin-bottom: 6mm;
  font-size: 13px; line-height: 1.7; color: #222;
  outline: none; white-space: pre-wrap;
}
.sheet-instruction:empty::before { content: attr(data-placeholder); color: #bbb; }
.sheet-instruction[contenteditable="true"] {
  border-bottom: 1px dashed #ccc; padding-bottom: 2px; cursor: text;
}
.instruction-toolbar {
  display: flex; align-items: center; gap: 6px;
  margin-bottom: 3px; font-size: 11px; color: #999;
}
.inst-size-btn {
  width: 20px; height: 20px; padding: 0;
  border: 1px solid #ddd; border-radius: 4px;
  background: #f5f5f5; color: #555; font-size: 13px;
  display: flex; align-items: center; justify-content: center; cursor: pointer;
}
.inst-size-btn:hover { background: #e8e8e8; }
#instSizeDisplay { font-size: 12px; color: #555; min-width: 18px; text-align: center; }

/* ===== problems grid ===== */
.probs-grid {
  display: grid;
  grid-template-columns: repeat(var(--cols, 3), 1fr);
  gap: 4mm 5mm;
  align-content: start;
}

/* ===== single angle problem ===== */
.angle-prob {
  display: flex; flex-direction: column;
  break-inside: avoid;
  width: 100%; min-width: 0;
}
.prob-label {
  font-size: 17px; font-weight: 600; color: #444; margin-bottom: 0.5mm;
}
.prob-fig {
  width: 100%;
  height: var(--fig-h, 60mm);
  position: relative;
}
.prob-fig svg { width: 100%; height: 100%; display: block; }

.drag-handle { cursor: grab; opacity: 0; transition: opacity 0.15s; }
.drag-handle-1 { fill: #fff; stroke: #3a7bd5; stroke-width: 1.5; }
.drag-handle-2 { fill: #fff; stroke: #f59e0b; stroke-width: 1.5; }
.angle-prob:hover .drag-handle { opacity: 1; }
@media print { .drag-handle { display: none !important; } }

.prob-controls {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; gap: 10px; align-items: center; justify-content: center;
  padding: 6px 8px;
  background: rgba(255,255,255,0.92);
  border-bottom: 1px solid #e0e0e0;
  opacity: 0; pointer-events: none;
  transition: opacity 0.15s;
  font-size: 16px; color: #555;
}
.prob-controls label { display: flex; align-items: center; gap: 5px; }
.prob-controls input {
  width: 76px; padding: 6px 8px;
  border: 1px solid #ccc; border-radius: 6px;
  font-size: 16px; background: #fff; text-align: center;
}
.prob-controls input:focus { outline: none; border-color: var(--accent); }
.angle-prob:hover .prob-controls {
  opacity: 1; pointer-events: auto;
}
.prob-answer-row {
  display: flex; align-items: flex-end; justify-content: center;
  margin-top: 1mm; font-size: 12px;
}
.prob-blank {
  display: inline-block; min-width: 42mm; height: 1em;
  border-bottom: 1.5px solid #333;
}
.prob-ans { font-weight: 700; color: #e25c4a; }

/* ===== zoom bar ===== */
.zoom-bar {
  position: fixed; bottom: 20px; right: 24px; z-index: 150;
  display: flex; align-items: center; gap: 1px;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0,0,0,.10);
  border-radius: 20px;
  padding: 3px 5px;
  box-shadow: 0 2px 10px rgba(0,0,0,.10);
  opacity: .55;
  transition: opacity .2s;
  user-select: none;
}
.zoom-bar:hover { opacity: 1; }
.zoom-btn {
  width: 26px; height: 26px; border: none; border-radius: 13px;
  background: transparent; font-size: 15px; font-weight: 700;
  color: #444; cursor: pointer; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  transition: background .12s;
}
.zoom-btn:hover { background: rgba(0,0,0,.07); }
.zoom-reset {
  min-width: 42px; border: none; border-radius: 4px;
  background: transparent; font-size: 12px; font-weight: 600;
  color: #555; cursor: pointer; padding: 2px 4px;
  transition: background .12s; border-left: 1px solid rgba(0,0,0,.09); margin-left: 2px; padding-left: 7px;
}
.zoom-reset:hover { background: rgba(0,0,0,.07); }
.zoom-slider {
  -webkit-appearance: none; appearance: none;
  width: 90px; height: 3px;
  background: rgba(0,0,0,.18); border-radius: 2px;
  outline: none; cursor: pointer;
  margin: 0 2px;
}
.zoom-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 1px 3px rgba(58,123,213,.4);
  transition: transform .1s;
}
.zoom-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.zoom-slider::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%; border: none;
  background: var(--accent); box-shadow: 0 1px 3px rgba(58,123,213,.4);
}

@page {
  size: A4 portrait;
  margin: 0;
}

/* ===== print override ===== */
@media print {
  .top-btns, .zoom-bar, .instruction-toolbar, .no-print { display: none !important; }
  .sheet-instruction { border: none; padding: 0; }
  .sheet-instruction.print-hide { display: none; }
  html, body { height: auto !important; overflow: visible !important; background: #fff !important; }
  .app, .preview-area { overflow: visible !important; height: auto !important; padding: 0 !important; }
  .sheet-wrapper { width: auto !important; height: auto !important; }
  .print-sheet { box-shadow: none !important; transform: none !important; overflow: visible !important; }
  .prob-ans { color: #e25c4a !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}