:root {
  --bg: #f4f4f7;
  --card: #ffffff;
  --ink: #16161a;
  --muted: #6b6b76;
  --line: #e4e4ea;
  --chip: #eeeef3;
  --accent: #4f46e5;
  --pos: #16a34a;
  --neg: #dc2626;
  --warn: #b45309;
  --warn-bg: #fef3c7;
  --rec-bg: #eef2ff;
  --shadow: 0 6px 24px rgba(20, 20, 40, .10);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111114;
    --card: #1c1c21;
    --ink: #f2f2f5;
    --muted: #9a9aa6;
    --line: #2c2c33;
    --chip: #2a2a31;
    --accent: #8b85ff;
    --pos: #22c55e;
    --neg: #f87171;
    --warn: #fbbf24;
    --warn-bg: #3a2e10;
    --rec-bg: #23234a;
    --shadow: 0 6px 24px rgba(0, 0, 0, .5);
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; margin: 0; }
body {
  display: flex; flex-direction: column;
  height: 100dvh; overflow: hidden; overscroll-behavior: none;
  background: var(--bg); color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) 0 env(safe-area-inset-left);
}
button { font: inherit; color: inherit; }

/* -- 上: タブ -- */
/* 2 段: 上の段に操作(未読・読み込み・ログアウト)、下の段にタブ(横に流れる) */
.top { display: flex; flex-direction: column; gap: 2px; padding: 4px 8px 4px 12px; }
.top-row { display: flex; align-items: center; gap: 4px; min-height: 40px; }
.app-name { flex: 1; font-size: 15px; font-weight: 700; color: var(--muted); }
.tabs { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; margin-right: -8px; padding-right: 8px; }
.tabs::-webkit-scrollbar { display: none; }
.tab {
  flex: none; border: 0; border-radius: 999px; padding: 6px 12px;
  background: var(--chip); font-size: 14px; white-space: nowrap;
}
.tab[aria-selected="true"] { background: var(--ink); color: var(--bg); }
.count { margin-left: 6px; font-weight: 600; font-variant-numeric: tabular-nums; }
.count.zero { opacity: .45; }
.icon-btn { flex: none; border: 0; background: none; font-size: 22px; width: 40px; height: 40px; border-radius: 50%; }
.pill-btn { flex: none; border: 1px solid var(--line); background: none; border-radius: 999px; padding: 4px 10px; font-size: 13px; color: var(--muted); }
.pill-btn[aria-pressed="true"] { color: var(--accent); border-color: var(--accent); }
.pill-btn[hidden] { display: none; }
.done.read { font-size: 13px; color: var(--muted); padding: 2px 10px; }
.icon-btn.small { font-size: 18px; width: 34px; color: var(--muted); }
.icon-btn.spin { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* -- 中: カードの山 -- */
.deck { position: relative; flex: 1; margin: 6px 12px 0; min-height: 0; }
.card {
  position: absolute; inset: 0;
  background: var(--card); border-radius: 20px; box-shadow: var(--shadow);
  touch-action: pan-y; user-select: none; -webkit-user-select: none;
  will-change: transform;
}
.card.behind { transform: scale(.96) translateY(10px); opacity: .6; pointer-events: none; }
.card .scroll { height: 100%; overflow-y: auto; padding: 18px 18px 24px; -webkit-overflow-scrolling: touch; }
.card h2 { font-size: 20px; line-height: 1.4; margin: 6px 0 4px; }
.card .sub { color: var(--muted); font-size: 14px; margin: 0 0 4px; }
.card .src, .card .price { color: var(--muted); font-size: 14px; margin: 0 0 10px; }
.card .price { color: var(--ink); font-weight: 600; }
.card .body { font-size: 16px; }
.card code { font-family: ui-monospace, Menlo, monospace; font-size: .88em; background: var(--chip); border-radius: 4px; padding: 0 3px; word-break: break-all; }
.card .note, .card .fine { color: var(--muted); font-size: 13px; }
.card .registered { color: var(--muted); font-size: 12px; margin: 0 0 6px; font-variant-numeric: tabular-nums; }
.card .fine { margin-top: 18px; }
.done {
  position: absolute; top: 10px; right: 12px; font-size: 26px;
  background: var(--bg); border-radius: 999px; padding: 0 8px; z-index: 1;
}
.meta { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { background: var(--chip); border-radius: 6px; padding: 1px 8px; font-size: 12px; color: var(--muted); }
.chip.warn { background: var(--warn-bg); color: var(--warn); font-weight: 600; }
.facts { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px; margin: 14px 0 0; }
.facts dt { font-size: 12px; color: var(--muted); }
.facts dd { margin: 0; font-size: 14px; }
.sec { margin-top: 14px; }
.sec h3 { font-size: 12px; color: var(--muted); margin: 0 0 2px; font-weight: 600; }
.sec p { margin: 0; }
.sec.rec { background: var(--rec-bg); border-radius: 10px; padding: 8px 10px; }
.links { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 18px; padding-top: 12px; border-top: 1px solid var(--line); }
.links a, .linkish { color: var(--accent); text-decoration: none; font-size: 15px; background: none; border: 0; padding: 0; }
.page-body { margin-top: 12px; font-size: 15px; user-select: text; -webkit-user-select: text; }
.page-body p { margin: 0 0 8px; }
.page-body h4 { margin: 14px 0 6px; font-size: 15px; }
.page-body .quote, .page-body .callout { border-left: 3px solid var(--line); padding-left: 10px; color: var(--muted); }
.page-body .code { font-family: ui-monospace, Menlo, monospace; font-size: 13px; white-space: pre-wrap; }
.empty { text-align: center; color: var(--muted); margin-top: 30vh; }

.pos { text-align: center; font-size: 12px; color: var(--muted); padding: 6px 0 2px; font-variant-numeric: tabular-nums; }

/* -- 下: 決めるボタン -- */
.bar { padding: 6px 12px calc(10px + env(safe-area-inset-bottom)); }
.actions { display: flex; gap: 10px; }
.act {
  flex: 1; height: 54px; border: 0; border-radius: 16px;
  background: var(--card); box-shadow: var(--shadow); font-size: 17px; font-weight: 600;
}
.act.pos { background: var(--pos); color: #fff; }
.act.neg { background: var(--card); color: var(--neg); }
.act.more { flex: 0 0 54px; font-size: 22px; }
.act:active { transform: scale(.97); }
.act:disabled { opacity: .35; }
body.busy .act { opacity: .5; pointer-events: none; }

/* -- 「…」のシート -- */
.sheet {
  border: 0; padding: 0; margin: auto auto 0; width: 100%; max-width: 560px;
  background: transparent;
}
.sheet::backdrop { background: rgba(0, 0, 0, .35); }
.sheet form { display: flex; flex-direction: column; gap: 8px; padding: 0 10px calc(10px + env(safe-area-inset-bottom)); }
.sheet #sheet-items { display: flex; flex-direction: column; background: var(--card); border-radius: 14px; overflow: hidden; }
.sheet #sheet-items button, .sheet .cancel {
  border: 0; background: var(--card); height: 56px; font-size: 17px; color: var(--accent);
}
.sheet #sheet-items button + button { border-top: 1px solid var(--line); }
.sheet .cancel { border-radius: 14px; font-weight: 600; }

/* -- ログイン -- */
.login { position: fixed; inset: 0; background: var(--bg); display: grid; place-items: center; z-index: 10; padding: 24px; }
.login[hidden] { display: none; }
.login-box { width: 100%; max-width: 360px; display: flex; flex-direction: column; gap: 14px; }
.login h1 { margin: 0 0 8px; }
.login p { margin: 0; color: var(--muted); font-size: 14px; }
.login-msg { min-height: 1.4em; color: var(--neg) !important; }
.login button { height: 50px; border: 0; border-radius: 12px; font-weight: 600; font-size: 17px; background: var(--card); box-shadow: var(--shadow); }
.login button.primary { background: var(--accent); color: #fff; }
.login details summary { color: var(--accent); font-size: 15px; }
.login form { display: flex; flex-direction: column; gap: 10px; margin-top: 10px; }
.login input { font-size: 17px; padding: 12px; border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--ink); }

/* -- 通知 -- */
.toast {
  position: fixed; left: 50%; bottom: calc(90px + env(safe-area-inset-bottom)); transform: translateX(-50%);
  background: var(--ink); color: var(--bg); padding: 8px 14px; border-radius: 999px; font-size: 14px;
  width: max-content; max-width: 90vw; z-index: 20; box-shadow: var(--shadow);
}
.toast[hidden] { display: none; }
.toast.err { background: var(--neg); color: #fff; }