:root { --text: #f1f6f9; --muted: #b8c7d3; --mint: #94efb6; --amber: #ffc163; --blue: #8cc4ff; --card: rgba(255,255,255,0.07); --line: rgba(255,255,255,0.14); }
* { box-sizing: border-box; }
html { background: #1c2a3d; }
body { margin: 0; min-height: 100vh; color: var(--text); font-family: 'Noto Sans JP', sans-serif;
  background: linear-gradient(160deg, #1d2b40 0%, #24405e 45%, #23495a 75%, #1e3446 100%); background-attachment: fixed; }
a { color: inherit; }

/* 背景: オーロラのような光+うっすらグリッド */
.sky { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 0;
  background-image: linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 64px 64px; }
.sky i { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; animation: drift 26s ease-in-out infinite alternate; }
.sky .g1 { width: 620px; height: 620px; left: -160px; top: -180px; background: #3fd0a0; }
.sky .g2 { width: 560px; height: 560px; right: -140px; top: 120px; background: #ff9f43; opacity: 0.32; animation-duration: 32s; }
.sky .g3 { width: 700px; height: 700px; left: 30%; bottom: -320px; background: #5a8dff; opacity: 0.38; animation-duration: 38s; }
@keyframes drift { to { transform: translate(60px, 40px) scale(1.12); } }

.wrap { position: relative; z-index: 1; max-width: 1120px; margin: 0 auto; padding: 64px 16px 80px; }
.hero { padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.kicker { margin: 0; font-family: 'Oswald', sans-serif; letter-spacing: 0.4em; font-size: 14px; color: var(--mint); }
.hero h1 { margin: 6px 0 12px; font-family: 'Oswald', sans-serif; font-size: clamp(40px, 7vw, 72px); letter-spacing: 0.03em; line-height: 1.05;
  background: linear-gradient(90deg, #ffffff 0%, #c9f7da 55%, #ffd9a1 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { margin: 0; max-width: 720px; color: var(--muted); line-height: 1.8; font-size: 15px; }
.meta { margin: 16px 0 0; display: flex; gap: 18px; flex-wrap: wrap; font-size: 14px; color: var(--muted); }
.meta a { color: var(--mint); text-decoration: none; font-weight: 700; }
h2 { font-family: 'Oswald', sans-serif; letter-spacing: 0.3em; font-size: 15px; color: var(--amber); margin: 44px 0 14px; }

.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.talk { display: flex; flex-direction: column; text-decoration: none; border-radius: 18px; overflow: hidden; background: var(--card);
  border: 1px solid var(--line); backdrop-filter: blur(6px); box-shadow: 0 18px 40px rgba(5,15,30,0.35); transition: transform .25s, border-color .25s, box-shadow .25s; }
.talk:hover { transform: translateY(-4px); border-color: rgba(148,239,182,0.6); box-shadow: 0 24px 50px rgba(5,15,30,0.5); }
.cover { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: #0c1014; }
.cover img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s; }
.talk:hover .cover img { transform: scale(1.04); }
.badge { position: absolute; left: 14px; top: 14px; font-size: 12px; font-weight: 900; color: #0c1014; background: var(--mint); border-radius: 999px; padding: 4px 12px; box-shadow: 0 4px 14px rgba(0,0,0,0.35); }
.info { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 6px; }
.ev { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; font-size: 13px; }
.date { font-family: 'Oswald', sans-serif; font-size: 16px; color: var(--mint); }
.event { color: var(--amber); font-weight: 700; }
.evlink { color: var(--blue); text-decoration: underline; cursor: pointer; }
.title { font-size: 17px; font-weight: 700; line-height: 1.55; }
.when { font-size: 13px; color: var(--muted); }
.nums { display: flex; gap: 18px; margin-top: 4px; font-size: 12px; color: var(--muted); }
.nums b { font-family: 'Oswald', sans-serif; font-size: 20px; color: var(--text); margin-right: 4px; }

/* 近日の登壇は大きく横長に */
.talk.big { flex-direction: row; }
.talk.big .cover { width: 62%; flex: none; }
.talk.big .info { justify-content: center; padding: 22px 26px; }
.talk.big .title { font-size: 22px; }

footer { margin-top: 48px; color: var(--muted); font-size: 13px; }

@media (max-width: 760px) {
  .grid { grid-template-columns: 1fr; }
  .talk.big { flex-direction: column; }
  .talk.big .cover { width: 100%; }
}

/* トークページ: 埋め込みプレーヤー + 情報 + 共有 + ほかのデッキ */
.talk-page { padding-top: 32px; }
.crumb a { color: var(--mint); text-decoration: none; font-weight: 700; font-size: 14px; }
.player { margin-top: 16px; }
.frame-box { position: relative; aspect-ratio: 16 / 9; border-radius: 16px; overflow: hidden; background: #0c1014;
  border: 1px solid var(--line); box-shadow: 0 24px 60px rgba(5,15,30,0.5); }
.frame-box iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.frame-box:fullscreen { border-radius: 0; border: 0; }
.controls { display: flex; align-items: center; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.controls button, .btn { font: inherit; font-size: 14px; font-weight: 700; color: var(--text); background: rgba(255,255,255,0.08);
  border: 1px solid var(--line); border-radius: 10px; padding: 8px 14px; cursor: pointer; text-decoration: none; }
.controls button:hover, .btn:hover { border-color: var(--mint); }
.controls .primary { background: var(--mint); color: #0c1014; border-color: var(--mint); }
.controls .spacer { flex: 1; }
.pageno { font-family: 'Oswald', sans-serif; font-size: 16px; color: var(--muted); min-width: 64px; text-align: center; }
.hint { color: var(--muted); font-size: 12px; margin: 8px 0 0; }
.talk-info { margin-top: 26px; padding: 22px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); }
.talk-title { margin: 8px 0 6px; font-size: clamp(22px, 3vw, 30px); line-height: 1.45; }
.talk-summary { color: #dce6ee; line-height: 1.9; font-size: 15px; }
.talk-summary p { margin: 0.6em 0; }
.talk-summary ul { margin: 0.4em 0; padding-left: 1.3em; }
.talk-summary strong { color: var(--mint); }
.talk-info .nums { margin: 14px 0 6px; }
.share { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 10px; }
.copied { color: var(--mint); font-size: 13px; font-weight: 700; }
.embed { margin-top: 12px; color: var(--muted); font-size: 13px; }
.embed textarea { width: 100%; margin-top: 8px; font: 12px ui-monospace, Menlo, monospace; color: var(--text); background: rgba(0,0,0,0.3);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px; resize: vertical; }
.more h2 { margin-top: 48px; }

/* 共有パネル(全画面ボタンの隣) */
.share-wrap { position: relative; }
.share-pop { position: absolute; right: 0; top: calc(100% + 8px); z-index: 20; width: 340px; padding: 14px; border-radius: 14px;
  background: #f7f9fb; color: #1b2430; box-shadow: 0 18px 50px rgba(0,0,0,0.45); }
.share-pop[hidden] { display: none; }
.sp-head { display: flex; justify-content: space-between; align-items: center; font-size: 14px; }
.share-pop .sp-close { border: 0; background: none; font-size: 20px; line-height: 1; cursor: pointer; color: #5b6670; padding: 0 4px; }
.sp-icons { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 14px; }
.share-pop .sp-ic { width: 40px; height: 40px; border-radius: 50%; border: 0; color: #fff; font: 800 16px/1 sans-serif; cursor: pointer; display: grid; place-items: center; }
.sp-ic:hover { filter: brightness(1.12); transform: translateY(-1px); }
.sp-label { font-size: 11px; font-weight: 800; letter-spacing: 0.12em; color: #7a8590; margin-bottom: 6px; }
.sp-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.share-pop .sp-btn { flex: 1; font: inherit; font-size: 13px; padding: 8px 10px; border-radius: 8px; border: 1px solid #d5dde4; background: #fff; color: #1b2430; cursor: pointer; }
.share-pop .sp-btn:hover { border-color: #2f9e6c; }
.sp-check { display: flex; align-items: center; gap: 6px; font-size: 12px; color: #4a5560; }
.share-pop .copied { color: #2f9e6c; }
.share-pop .sp-from { margin: 12px 0 0; padding: 8px 10px; border-radius: 8px; background: #e9f6ef; font-size: 13px; font-weight: 700; color: #1b2430; cursor: pointer; }
.share-pop .sp-from[hidden] { display: none; }
.talk-summary ul.links { list-style: none; padding: 0; margin: 14px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.talk-summary ul.links li { display: flex; align-items: baseline; gap: 8px; padding: 6px 12px; border-radius: 999px; background: rgba(255,255,255,0.08); border: 1px solid var(--line); font-size: 13px; line-height: 1.5; }
.talk-summary ul.links a { color: var(--mint); font-weight: 700; text-decoration: none; }
.talk-summary ul.links a:hover { text-decoration: underline; }
.talk-summary ul.links span { color: var(--muted); font-size: 12px; }
.talk-summary .video { position: relative; aspect-ratio: 16 / 9; margin: 16px 0 4px; border-radius: 12px; overflow: hidden; background: #000; }
.talk-summary .video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* 全画面 API が無い環境(iPhone Safari)向け: プレーヤーを画面いっぱいに */
.frame-box .exit-full { display: none; }
.frame-box.pseudo-full { position: fixed; inset: 0; height: 100dvh; z-index: 1000; aspect-ratio: auto; border-radius: 0; border: 0; background: #000; }
.frame-box.pseudo-full .exit-full { display: block; opacity: 0; visibility: hidden; transition: opacity .3s, visibility 0s .3s; position: absolute; z-index: 2; top: max(10px, env(safe-area-inset-top)); left: max(10px, env(safe-area-inset-left));
  font: 700 13px/1 'Noto Sans JP', sans-serif; color: #fff; background: rgba(0,0,0,0.55); border: 1px solid rgba(255,255,255,0.3); border-radius: 999px; padding: 8px 12px; }
html.no-scroll, html.no-scroll body { overflow: hidden; }
/* 全画面時の大きなページ送り(左右端) */
.frame-box .nav-ov { display: none; }
.frame-box.pseudo-full .nav-ov, .frame-box:fullscreen .nav-ov { display: grid; place-items: center; position: absolute; z-index: 2; top: 50%; transform: translateY(-50%);
  width: 56px; height: 96px; border: 0; border-radius: 14px; background: rgba(0,0,0,0.38); color: #fff; font: 700 44px/1 sans-serif; cursor: pointer;
  opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .3s, visibility 0s .3s; }
.frame-box.nav-on .nav-ov { opacity: 0.8; visibility: visible; pointer-events: auto; transition: opacity .2s; }
.frame-box .nav-ov.prev { left: max(8px, env(safe-area-inset-left)); }
.frame-box .nav-ov.next { right: max(8px, env(safe-area-inset-right)); }
.frame-box.nav-on .nav-ov:hover, .frame-box.nav-on .nav-ov:active { opacity: 1; background: rgba(0,0,0,0.6); }

/* トップのプロフィールリンク */
.profile { list-style: none; padding: 0; margin: 14px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.profile a { display: inline-block; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: rgba(255,255,255,0.08);
  color: var(--text); font-size: 13px; font-weight: 700; text-decoration: none; transition: border-color .2s; }
.profile a:hover { border-color: var(--mint); color: var(--mint); }

.frame-box.pseudo-full.nav-on .exit-full { opacity: 1; visibility: visible; transition: opacity .2s; }

/* チャプター(章の扉ページ) */
.ch-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.ch { display: flex; flex-direction: column; padding: 0; text-align: left; font: inherit; color: var(--text); cursor: pointer; overflow: hidden;
  border-radius: 14px; border: 1px solid var(--line); background: var(--card); transition: transform .2s, border-color .2s; }
.ch:hover { transform: translateY(-3px); border-color: rgba(148,239,182,0.6); }
.ch img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; background: #0c1014; }
.ch-txt { display: flex; flex-direction: column; gap: 3px; padding: 10px 14px 12px; }
.ch-num { font-family: 'Oswald', sans-serif; color: var(--mint); font-size: 13px; letter-spacing: 0.08em; }
.ch-title { font-weight: 700; font-size: 15px; line-height: 1.4; }
.ch-sub { color: var(--muted); font-size: 12px; line-height: 1.5; }
.ch-page { color: var(--muted); font-size: 11px; font-family: 'Oswald', sans-serif; margin-top: 2px; }
.chapters h2 { margin-top: 44px; }