/* 国産パソコン年表ビューア - スタイル
   外部フォント・外部CSSは一切読み込まず、システムフォントのみを使用する。 */

:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --ink: #e8ecf2;
  --muted: #98a2b3;
  --line: #2a303c;
  --accent: #ffd43b;
  --quick: #ff6b6b;
  --heisei: #ff922b;
  --branch: #9aa7bd;
  --focus: #74c0fc;
  --radius: 10px;
  --topbar-h: auto;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN",
               "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- ヘッダ / コントロール ---------- */

.topbar {
  flex: 0 0 auto;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.brand h1 {
  margin: 0;
  font-size: 18px;
  letter-spacing: .02em;
}

.brand .sub {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.brand-links {
  margin: 4px 0 0;
  font-size: 11px;
  color: var(--muted);
}
.brand-links a,
.foot a {
  color: var(--focus);
  text-decoration: none;
}
.brand-links a:hover,
.foot a:hover,
.brand-links a:focus-visible,
.foot a:focus-visible {
  text-decoration: underline;
}
.brand-links .sep,
.foot .sep {
  margin: 0 6px;
  color: var(--line);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: center;
}

.ctl-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.ctl-group > label {
  font-size: 12px;
  color: var(--muted);
}

.btn,
.select,
.search,
.maker-toggle {
  font: inherit;
  color: var(--ink);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 6px 10px;
  cursor: pointer;
}

.btn.ghost { background: transparent; color: var(--muted); }
.btn:hover, .select:hover, .maker-toggle:hover { border-color: #3d465a; }

.search {
  cursor: text;
  min-width: 200px;
  max-width: 44vw;
}

.count {
  font-size: 12px;
  color: var(--muted);
  min-width: 3.5em;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* メーカートグル */
.maker-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-size: 13px;
  opacity: .42;
  filter: grayscale(1);
}
.maker-toggle[aria-pressed="true"] {
  opacity: 1;
  filter: none;
}
.maker-toggle .swatch {
  width: 12px; height: 12px;
  border-radius: 3px;
  background: currentColor;
  flex: 0 0 auto;
}

/* 分類絞り込みトグル（メーカートグルの見た目を中立色で流用） */
.bit-toggle { color: var(--branch); }

/* 凡例 */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 12px;
  color: var(--muted);
  align-items: center;
}
.legend .lg {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.legend .lg-line {
  width: 26px; height: 0;
  border-top: 2px solid var(--muted);
}
.legend .lg-line.heisei { border-top: 3px dashed var(--heisei); }
.legend .lg-line.branch { border-top: 2px dashed var(--branch); }

/* ---------- 本体 ---------- */

main {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.status {
  margin: 0;
  padding: 6px 14px;
  font-size: 12px;
  color: var(--muted);
}
.status.error { color: #ff8787; }
.status[hidden] { display: none; }

.scroller {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  background: var(--bg);
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

#chart { display: block; }

.hint {
  flex: 0 0 auto;
  margin: 0;
  padding: 5px 14px;
  font-size: 11px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: var(--panel);
}

.foot {
  flex: 0 0 auto;
  margin: 0;
  padding: 4px 14px 6px;
  font-size: 11px;
  color: var(--muted);
  background: var(--panel);
}

/* ---------- SVG 内の見た目 ---------- */

.model-box { cursor: pointer; }
.model-box .box-rect {
  stroke-width: 1.5;
  transition: filter .12s ease;
}
.model-box:hover .box-rect,
.model-box:focus .box-rect { filter: brightness(1.35); }
.model-box:focus { outline: none; }
.model-box:focus .box-rect {
  stroke: var(--focus);
  stroke-width: 2.5;
}

.model-box.dim { opacity: .16; }
.model-box.hit .box-rect {
  stroke: var(--accent);
  stroke-width: 2.5;
}

.conn { fill: none; stroke-linecap: round; }
.conn.dim { opacity: .12; }

/* 系列をまたぐ分岐線（破線の矢印）。本線より細く控えめに描く。 */
.branch {
  fill: none;
  stroke-linecap: butt;
  stroke-linejoin: round;
  pointer-events: stroke;
}
.branch.dim { opacity: .12; }

/* ---------- モーダル ---------- */

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.modal[hidden] { display: none; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, .62);
}

.modal-panel {
  position: relative;
  width: min(480px, 100%);
  max-height: 84vh;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px 20px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, .55);
}

.modal-close {
  position: absolute;
  top: 8px; right: 8px;
  width: 34px; height: 34px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel-2);
  color: var(--ink);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.modal-maker {
  margin: 0 0 2px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}
.modal-title {
  margin: 0 0 12px;
  font-size: 19px;
  line-height: 1.35;
  padding-right: 34px;
}

.modal-dl {
  margin: 0;
  display: grid;
  grid-template-columns: 8.5em 1fr;
  gap: 6px 12px;
  font-size: 14px;
}
.modal-dl dt {
  color: var(--muted);
  font-size: 12.5px;
  padding-top: 2px;
}
.modal-dl dd { margin: 0; }
.modal-dl dd.none { color: var(--muted); }

.gap-badge {
  display: inline-block;
  margin-left: 6px;
  border-radius: 999px;
  padding: 1px 8px;
  font-size: 11px;
  border: 1px solid var(--line);
  color: var(--muted);
}
.gap-badge.quick {
  border-color: var(--quick);
  color: var(--quick);
  font-weight: 700;
}

/* ---------- 狭幅対応 ---------- */

@media (max-width: 720px) {
  .brand h1 { font-size: 16px; }
  .brand .sub { font-size: 11px; }
  .brand-links { font-size: 10px; }
  .topbar { padding: 8px 10px; }
  .controls { gap: 6px 10px; }
  .search { min-width: 140px; max-width: 60vw; }
  .legend { font-size: 11px; gap: 4px 10px; }
  .modal-dl { grid-template-columns: 1fr; gap: 2px; }
  .modal-dl dt { padding-top: 8px; }
}

@media (max-width: 420px) {
  .maker-toggle { padding: 4px 8px; font-size: 12px; }
  .btn, .select { padding: 5px 8px; }
}