:root {
  --ink: #1d2530; --muted: #5d6877; --line: #dde2e8; --bg: #f6f7f9; --card: #fff;
  --accent: #1f5fbf; --accent-ink: #fff; --warn: #a33a1d; --ok: #1d7a45;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink);
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #e7ebf0; --muted: #a2adbb; --line: #2c3440; --bg: #12161c; --card: #1a2028;
          --accent: #6ea0ff; --accent-ink: #0d1117; --warn: #ff8a65; --ok: #6fd39b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); min-height: 100vh; display: flex; flex-direction: column; }
.bar { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px;
       border-bottom: 1px solid var(--line); background: var(--card); }
.brand b { color: var(--accent); }
main { flex: 1; width: 100%; max-width: 980px; margin: 0 auto; padding: 24px 16px; }
main.narrow { max-width: 460px; }
h1 { font-size: 1.5rem; margin: 0 0 12px; }
button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid var(--line);
         background: var(--card); color: var(--ink); padding: 8px 14px; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); width: 100%; padding: 12px; }
button.link { border: 0; background: none; color: var(--accent); padding: 0 0 0 12px; }
button:disabled { opacity: .5; cursor: default; }
input { font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px;
        background: var(--card); color: var(--ink); }
.msg { min-height: 1.5em; color: var(--warn); }
.msg.ok { color: var(--ok); }
.hint, .muted { color: var(--muted); font-size: .9rem; }
table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: 8px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 16px; }
.toolbar input { flex: 1; min-width: 200px; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px; margin: 0 0 16px; }
.cardview { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: flex; align-items: center; justify-content: center; padding: 16px; }
.cardview[hidden] { display: none; }
.cardbox { position: relative; background: var(--card); border-radius: 12px; padding: 24px; width: 100%; max-width: 420px;
           user-select: none; -webkit-user-select: none; overflow: hidden; }
.cardbox .num { font: 1.6rem/1.3 ui-monospace, Menlo, monospace; letter-spacing: .08em; margin: 8px 0; }
.cardbox .mark { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; transform: rotate(-24deg);
                 font-size: .9rem; color: var(--muted); opacity: .25; pointer-events: none; white-space: nowrap; }
.cardbox .timer { color: var(--warn); font-size: .9rem; }
.foot { padding: 16px; text-align: center; color: var(--muted); font-size: .85rem; }
@media (max-width: 640px) { th:nth-child(4), td:nth-child(4) { display: none; } }