:root {
  --green: #2f6f4a;
  --green-dark: #24573a;
  --green-soft: #e8f2ec;
  --ink: #1d2621;
  --sub: #5a665f;
  --line: #d6dfd9;
  --bg: #f6f8f6;
  --card: #ffffff;
  --warn: #a14a12;
  --warn-bg: #fff3e6;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --green: #6fbf8e;
    --green-dark: #8fd1a8;
    --green-soft: #213229;
    --ink: #e6ece8;
    --sub: #a7b3ac;
    --line: #34413a;
    --bg: #141a17;
    --card: #1c2420;
    --warn: #f2b07a;
    --warn-bg: #2d2219;
  }
}
:root[data-theme="dark"] {
  --green: #6fbf8e; --green-dark: #8fd1a8; --green-soft: #213229; --ink: #e6ece8; --sub: #a7b3ac;
  --line: #34413a; --bg: #141a17; --card: #1c2420; --warn: #f2b07a; --warn-bg: #2d2219;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
  font-size: 18px;
  line-height: 1.7;
}
[hidden] { display: none !important; }

.bar {
  display: flex; align-items: center; gap: 12px;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  background: var(--green); color: #fff;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .bar { background: #1f3a2b; } }
.bar-icon { width: 40px; height: 40px; border-radius: 9px; border: 2px solid rgba(255,255,255,.75); }
.bar-title { font-weight: 700; font-size: 17px; line-height: 1.3; }
.bar-sub { font-size: 13px; opacity: .9; }

main { max-width: 760px; margin: 0 auto; padding: 18px 16px calc(40px + env(safe-area-inset-bottom)); }
h1 { font-size: 24px; margin: 6px 0 8px; }
.lead { margin: 0 0 16px; }
.center { text-align: center; color: var(--sub); margin-top: 40px; }
.hint { color: var(--sub); font-size: 15px; margin: 10px 0; }
.demo-note { background: var(--warn-bg); color: var(--warn); border-radius: 8px; padding: 8px 12px; font-size: 14px; margin-bottom: 12px; }

label { display: block; font-weight: 700; margin-bottom: 6px; }
input {
  width: 100%; font-size: 20px; padding: 14px; border-radius: 10px;
  border: 2px solid var(--line); background: var(--card); color: var(--ink);
}
input:focus { outline: none; border-color: var(--green); }
.code-input { font-size: 30px; letter-spacing: .3em; text-align: center; font-variant-numeric: tabular-nums; }

.btn {
  display: block; width: 100%; margin-top: 14px; padding: 15px; border: 0; border-radius: 10px;
  background: var(--green); color: #fff; font-size: 19px; font-weight: 700; text-align: center;
  text-decoration: none; cursor: pointer; font-family: inherit;
}
.btn:active { background: var(--green-dark); }
.btn[disabled] { opacity: .55; }
.btn-sub { background: var(--card); color: var(--green); border: 2px solid var(--green); font-size: 16px; padding: 12px; }

.msg { min-height: 1em; margin: 12px 0 0; color: var(--warn); font-weight: 700; }
.msg.ok { color: var(--green); }
.help { margin-top: 18px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; }
.help summary { cursor: pointer; font-weight: 700; color: var(--green); }
.help ul { padding-left: 1.2em; margin: 8px 0; font-size: 16px; }

.hello { font-size: 20px; font-weight: 700; margin: 0 0 12px; }
.tip { background: var(--green-soft); border-radius: 12px; padding: 12px 14px; margin-bottom: 16px; font-size: 16px; }
.tip p { margin: 6px 0 0; }
.tip-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.tip-close { border: 0; background: transparent; font-size: 22px; line-height: 1; color: var(--sub); cursor: pointer; padding: 0 4px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 6px; }
.chip {
  border: 2px solid var(--line); background: var(--card); color: var(--ink);
  border-radius: 999px; padding: 6px 14px; font-size: 16px; font-family: inherit; cursor: pointer;
}
.chip[aria-pressed="true"] { background: var(--green); border-color: var(--green); color: #fff; font-weight: 700; }

.sec-title { font-size: 18px; margin: 22px 0 10px; color: var(--sub); }
.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.card {
  display: grid; grid-template-columns: 132px 1fr; align-items: stretch; width: 100%; padding: 0; text-align: left;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  cursor: pointer; font-family: inherit; color: inherit; font-size: inherit;
}
.card:active { border-color: var(--green); }
.thumb { position: relative; aspect-ratio: 16 / 9; align-self: center; background: var(--green-soft); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb .ph { position: absolute; inset: 0; display: grid; place-items: center; color: var(--green); font-size: 22px; font-weight: 800; }
.play {
  position: absolute; right: 6px; bottom: 6px; background: rgba(0,0,0,.72); color: #fff;
  border-radius: 999px; padding: 1px 9px; font-size: 13px; font-weight: 700;
}
.card-body { padding: 8px 12px; }
.meta { font-size: 14px; color: var(--sub); line-height: 1.5; }
.meta b { color: var(--green); }
.meta .who { white-space: nowrap; }
.title { font-weight: 700; font-size: 16px; line-height: 1.5; margin-top: 2px; }
@media (min-width: 640px) {
  .cards { grid-template-columns: 1fr 1fr; }
  .card { grid-template-columns: 1fr; }
  .thumb .ph { font-size: 34px; }
  .card-body { padding: 10px 14px 14px; }
  .title { font-size: 18px; }
}

.next { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.next li { padding: 10px 2px; border-bottom: 1px solid var(--line); font-size: 16px; }
.next .meta { display: block; }

.foot { margin-top: 28px; display: grid; gap: 4px; }

.player {
  position: fixed; inset: 0; z-index: 10; background: #000; color: #fff;
  display: flex; flex-direction: column; overflow-y: auto;
  padding-top: env(safe-area-inset-top);
}
.player-top { padding: 8px 10px; }
.btn-close { background: transparent; color: #fff; border: 0; font-size: 18px; padding: 8px; cursor: pointer; font-family: inherit; }
.player-frame { width: 100%; max-width: 1000px; margin: 0 auto; aspect-ratio: 16 / 9; background: #111; }
.player-frame iframe { width: 100%; height: 100%; border: 0; display: block; }
.player-frame .ph { height: 100%; display: grid; place-items: center; color: #9bb; font-size: 16px; text-align: center; padding: 16px; }
.player-info { width: 100%; max-width: 1000px; margin: 0 auto; padding: 14px 16px calc(30px + env(safe-area-inset-bottom)); }
.player-meta { color: #b9c6bf; font-size: 15px; }
.player-info h2 { font-size: 20px; margin: 4px 0 14px; line-height: 1.5; }
.player-info .btn-sub { background: transparent; color: #cfe; border-color: #577; }