:root {
  --bg: #0b0e14;
  --panel: #0f131b;
  --line: #1c2230;
  --line-strong: #c9d3ea;
  --text: #e6ebf5;
  --sub: #8b95a9;
  --accent: #8fb0ff;
  --placeholder: #161c28;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
body.noscroll { overflow: hidden; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }

/* ---------- ロック画面 ---------- */
.lock { min-height: 100vh; min-height: 100dvh; display: grid; place-items: center; padding: 24px 16px; }
.lock-box {
  width: min(360px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 32px 24px 24px;
  text-align: center;
}
.lock-icon { font-size: 34px; }
.lock-box h1 { margin: 8px 0 4px; font-size: 22px; }
.lock-note { margin: 0 0 18px; color: var(--sub); font-size: 14px; }
.lock-box input {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg); color: var(--text);
  font-size: 16px;
}
.lock-box input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.lock-box button {
  width: 100%; margin-top: 12px; padding: 12px; border-radius: 10px; border: 0;
  background: var(--accent); color: #0b0e14; font-weight: 700; font-size: 16px;
}
.lock-box button:disabled { opacity: .6; cursor: progress; }
.lock-msg { min-height: 1.5em; margin: 12px 0 0; color: #ff9a9a; font-size: 14px; }

/* ---------- 本体レイアウト ---------- */
#app { display: grid; grid-template-columns: 280px minmax(0, 1fr); min-height: 100vh; }
.side {
  position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column;
  background: var(--panel); border-right: 1px solid var(--line);
  padding: 18px 16px;
}
.side-list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; padding-right: 2px; }
.side-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px; border-radius: 14px;
  border: 1px solid var(--line); background: #0c1017;
}
.side-item:hover { border-color: #33405a; }
.side-item.active { border-color: var(--line-strong); background: #141a26; }
.side-thumb {
  flex: none; width: 64px; height: 56px; border-radius: 6px;
  background: var(--placeholder); object-fit: cover; display: block;
}
.side-text { min-width: 0; }
.side-name { font-size: 14px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side-count { font-size: 12px; color: var(--sub); font-variant-numeric: tabular-nums; }
.side-foot { border-top: 1px solid var(--line); margin-top: 12px; padding-top: 12px; }
.foot-btn { background: none; border: 0; padding: 6px 4px; color: var(--sub); font-size: 14px; }
.foot-btn:hover { color: var(--text); }
.updated { margin-top: 4px; padding-left: 4px; font-size: 11px; color: var(--sub); }

.main { padding: 24px 24px 48px; min-width: 0; }
.main-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 18px; }
.main-title { margin: 0; font-size: 24px; line-height: 1.3; word-break: break-word; }
.main-sub { margin: 4px 0 0; color: var(--sub); font-size: 14px; font-variant-numeric: tabular-nums; }
.back {
  flex: none; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--panel); font-size: 14px; white-space: nowrap;
}
.back:hover { border-color: #33405a; }
.empty { color: var(--sub); padding: 48px 0; text-align: center; }

/* ---------- グリッド ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 8px; }
.card { position: relative; display: block; border-radius: 8px; overflow: hidden; background: var(--placeholder); }
.card:hover { outline: 2px solid var(--accent); outline-offset: -2px; }
.card-img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: var(--placeholder); }
.card-none { display: grid; place-items: center; width: 100%; aspect-ratio: 4 / 3; color: var(--sub); font-size: 13px; }
.card-no {
  position: absolute; top: 0; left: 0; padding: 4px 10px 14px 8px;
  font-size: 20px; font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, rgba(0,0,0,.7), rgba(0,0,0,0) 90%);
  text-shadow: 0 1px 3px rgba(0,0,0,.8);
}
.card-badges {
  position: absolute; left: 0; right: 0; bottom: 0; display: flex; gap: 12px;
  padding: 18px 10px 7px; font-size: 13px; font-variant-numeric: tabular-nums;
  background: linear-gradient(0deg, rgba(0,0,0,.72), rgba(0,0,0,0));
}
.card-dur {
  position: absolute; right: 6px; bottom: 6px; padding: 1px 6px; border-radius: 4px;
  background: rgba(0,0,0,.72); font-size: 12px; font-variant-numeric: tabular-nums;
}
.file-name {
  padding: 6px 8px 8px; font-size: 12px; color: var(--sub);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.file { border-radius: 8px; overflow: hidden; background: var(--panel); border: 1px solid var(--line); }
.file .card { border-radius: 0; }

/* ---------- ビューア ---------- */
.viewer { position: fixed; inset: 0; z-index: 10; display: flex; flex-direction: column; background: #05070a; }
.viewer-bar {
  flex: none; display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-bottom: 1px solid var(--line);
}
.v-btn {
  flex: none; min-width: 40px; padding: 6px 12px; border-radius: 999px; text-align: center;
  border: 1px solid var(--line); background: var(--panel); font-size: 15px;
}
.v-btn:hover { border-color: #33405a; }
.v-btn.off { opacity: .35; pointer-events: none; }
.v-title { flex: 1; min-width: 0; font-size: 15px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.v-count { flex: none; color: var(--sub); font-size: 13px; font-variant-numeric: tabular-nums; }
.viewer-body { flex: 1; overflow: auto; padding: 16px; text-align: center; }
.viewer-body img { display: block; max-width: 100%; height: auto; margin: 0 auto; border-radius: 6px; background: var(--placeholder); }
.viewer-body img.sheet { width: min(100%, 1400px); }
.v-meta { margin: 0 0 12px; color: var(--sub); font-size: 13px; font-variant-numeric: tabular-nums; }
.v-note { margin: 48px 0; color: var(--sub); }

/* ---------- スマホ ---------- */
@media (max-width: 760px) {
  #app { grid-template-columns: minmax(0, 1fr); }
  .side { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); padding: 12px; }
  .side-list { flex-direction: row; overflow-x: auto; overflow-y: hidden; padding-bottom: 6px; }
  .side-item { flex: none; width: 210px; }
  .side-foot { display: flex; align-items: center; justify-content: space-between; margin-top: 8px; padding-top: 8px; }
  .updated { margin: 0; }
  .main { padding: 16px 12px 40px; }
  .main-title { font-size: 20px; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; }
  .viewer-body { padding: 10px; }
}