/* Poker Tokyo「学ぶ」(pokertokyo.com/learn/): the night table look of the game, made for reading.
   Layout: a header with the menu; pages are a narrow head (eyebrow, title, lead) over a wide body.
   Articles: a sticky table of contents on the left, a 720px reading column; cards in a 3-column grid. */
:root{color-scheme:dark;
 --bg:#080c1b;--bg2:#0c1226;--panel:#111a31;--panel2:#16213c;--line:#25345299;--line2:#2c3e5f;
 --text:#e8edf8;--text2:#c3cee3;--muted:#8c9cba;--pink:#f08ad4;--pink2:#ff5fb4;--cyan:#85d4f7;--gold:#e2c178;--green:#7fd8a6;
 --radius:14px;--wrap:1180px;--read:720px;
 --sans:"Zen Kaku Gothic New",-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
 --serif:"Shippori Mincho B1","Hiragino Mincho ProN","Yu Mincho",serif}
*{box-sizing:border-box}
html{scroll-padding-top:84px;-webkit-text-size-adjust:100%}
body{margin:0;background:radial-gradient(ellipse 60% 40% at 0 0,#2c1233 0,transparent 70%),radial-gradient(ellipse 50% 40% at 100% 0,#0f2645 0,transparent 70%),var(--bg);
 background-repeat:no-repeat;color:var(--text);font-family:var(--sans);font-size:16px;line-height:1.9;overflow-wrap:anywhere;min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
a{color:var(--cyan);text-underline-offset:4px}
a:hover{color:#fff}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:max(20px,env(safe-area-inset-left));padding-right:max(20px,env(safe-area-inset-right))}
.skip{position:absolute;top:-100px;left:16px;background:var(--panel);padding:10px 14px;z-index:20;border-radius:6px}
.skip:focus{top:8px}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.eyebrow{margin:0 0 10px;color:var(--cyan);font-size:12px;letter-spacing:.18em;font-weight:700}

/* header */
.site-header{position:sticky;top:0;z-index:10;background:#080c1bdd;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.header-in{display:flex;align-items:center;gap:20px;min-height:64px}
.brand{display:inline-flex;align-items:baseline;gap:8px;text-decoration:none;color:#fff;white-space:nowrap}
.brand-suit{color:var(--pink);text-shadow:0 0 16px #ed27c0;font-size:18px}
.brand-name{font-weight:700;letter-spacing:.12em;font-size:17px}
.brand-name em{font-style:normal;color:var(--pink)}
.brand-learn{font-weight:700;font-size:15px;color:var(--text);padding:1px 8px;border:1px solid #f08ad466;border-radius:999px;line-height:1.5}
.site-nav{display:flex;gap:4px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;margin-left:auto}
.site-nav::-webkit-scrollbar{display:none}
.site-nav a{color:var(--text2);text-decoration:none;font-size:14px;padding:8px 12px;border-radius:8px;white-space:nowrap}
.site-nav a:hover,.site-nav a[aria-current=page]{color:#fff;background:#ffffff10}
.site-nav a[aria-current=page]{box-shadow:inset 0 -2px 0 var(--pink)}
.header-tools{display:flex;align-items:center;gap:10px}
.header-search{display:grid;place-items:center;width:40px;height:40px;border-radius:10px;color:var(--text2);border:1px solid var(--line2)}
.header-search svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round}
.header-search:hover{color:#fff;border-color:var(--cyan)}
.header-play{font-size:13px;font-weight:700;text-decoration:none;color:#1a0b14;background:var(--pink);padding:9px 14px;border-radius:999px;white-space:nowrap}
.header-play:hover{color:#1a0b14;background:#ffb3e6}

/* buttons, chips */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 22px;border-radius:999px;font-weight:700;font-size:15px;text-decoration:none;
 background:var(--pink);color:#1a0b14;border:1px solid var(--pink);cursor:pointer;font-family:inherit}
.btn:hover{background:#ffb3e6;color:#1a0b14}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line2)}
.btn-ghost:hover{background:#ffffff10;color:#fff;border-color:var(--cyan)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-size:13px;text-decoration:none;color:var(--text2);border:1px solid var(--line2);border-radius:999px;padding:3px 12px}
.chip:hover{color:#fff;border-color:var(--pink)}

/* home */
.home-hero{padding:56px 0 24px}
.hero-in{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center}
.home-hero h1{font-family:var(--serif);font-weight:800;font-size:clamp(30px,4.1vw,48px);line-height:1.35;margin:0 0 18px;letter-spacing:.02em}
.hero-lead{color:var(--text2);margin:0 0 28px;max-width:34em}
.hero-actions,.page-actions,.cta-buttons{display:flex;flex-wrap:wrap;gap:12px;margin:0}
.hero-feature{position:relative;display:block;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line2);box-shadow:0 20px 60px #0008,0 0 0 1px #f08ad41a;text-decoration:none}
.hero-feature img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .4s}
.hero-feature:hover img{transform:scale(1.02)}
.hero-feature-label{position:absolute;left:0;right:0;bottom:0;padding:28px 18px 14px;background:linear-gradient(transparent,#080c1bee);color:#fff;font-weight:700;font-size:15px;display:flex;gap:10px;align-items:center}
.hero-feature-label span{font-size:12px;background:var(--pink);color:#1a0b14;border-radius:999px;padding:2px 10px;flex:none}
.home-section{padding-top:40px;padding-bottom:8px}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 18px;margin-bottom:20px;border-bottom:1px solid var(--line);padding-bottom:12px}
.section-head h2{margin:0;font-size:24px;font-weight:700}
.section-head p{margin:0;color:var(--muted);font-size:14px;flex:1 1 300px}
.section-head .more{font-size:14px;margin-left:auto;white-space:nowrap}
.rail{list-style:none;margin:0;padding:0 0 8px;display:grid;grid-auto-flow:column;grid-auto-columns:minmax(220px,1fr);gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:thin}
.rail li{scroll-snap-align:start}
.rail a{display:block;text-decoration:none;color:var(--text)}
.rail a:hover .rail-title{color:#fff;text-decoration:underline;text-underline-offset:4px}
.rail-title{margin:2px 0 0;font-weight:700;font-size:15px;line-height:1.5}
.lesson-img{position:relative;border-radius:10px;overflow:hidden;border:1px solid var(--line2)}
.lesson-img img{width:100%;aspect-ratio:16/9;object-fit:cover}
.lesson-no{margin:10px 0 0;color:var(--gold);font-size:12px;font-weight:700;letter-spacing:.06em}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.card{background:linear-gradient(160deg,var(--panel),var(--bg2));border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:border-color .2s,transform .2s}
.card:hover{border-color:#f08ad488;transform:translateY(-2px)}
.card-link{display:flex;flex-direction:column;height:100%;color:inherit;text-decoration:none}
.card-img{position:relative;aspect-ratio:16/9;background:var(--panel2);overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover}
.card-noimg{display:grid;place-items:center;height:100%;font-size:42px;color:var(--pink);opacity:.5}
.card-badge{position:absolute;right:10px;bottom:10px;font-size:12px;font-weight:700;background:#080c1bdd;color:#fff;border:1px solid #ffffff2a;border-radius:999px;padding:2px 10px}
.card-body{padding:16px 18px 18px;display:flex;flex-direction:column;flex:1}
.card-cat{margin:0 0 6px;color:var(--pink);font-size:12px;font-weight:700;letter-spacing:.06em}
.card-title{margin:0 0 8px;font-size:17px;line-height:1.55;font-weight:700}
.card-desc{margin:0 0 12px;color:var(--text2);font-size:14px;line-height:1.75;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{margin:auto 0 0;display:flex;gap:14px;color:var(--muted);font-size:12px}
.card-small .card-desc{display:none}

/* list pages */
.crumbs{padding-top:20px;font-size:13px;color:var(--muted)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:4px 8px;margin:0;padding:0}
.crumbs li:not(:last-child)::after{content:"›";margin-left:8px;color:var(--line2)}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:#fff}
.crumbs [aria-current]{color:var(--text2)}
.page-head{padding-top:24px;padding-bottom:28px}
.page-head h1{font-family:var(--serif);font-weight:800;font-size:clamp(30px,4vw,44px);line-height:1.4;margin:0 0 12px}
.page-lead{color:var(--text2);max-width:46em;margin:0 0 18px}
.page-count{color:var(--muted);font-size:13px;margin:0}
.page-body{padding-bottom:64px}
.empty{color:var(--muted)}
.sub{font-size:20px}

/* lessons page */
.lesson-group{margin-bottom:44px}
.lesson-group h2{font-size:22px;margin:0 0 16px;padding-left:12px;border-left:3px solid var(--pink);line-height:1.4}
.lesson-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.lesson a{display:grid;grid-template-columns:minmax(0,240px) 1fr;gap:16px;align-items:start;text-decoration:none;color:inherit;padding:12px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.lesson a:hover{border-color:#f08ad488}
.lesson .lesson-no{margin:0 0 2px}
.lesson h3{margin:0 0 6px;font-size:17px;line-height:1.5}
.lesson p:not(.lesson-no){margin:0;color:var(--text2);font-size:13px;line-height:1.7}

/* article */
.post-head{max-width:calc(var(--read) + 280px);padding-top:18px;padding-bottom:12px}
.post-cat{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;margin:0 0 12px;font-size:13px;font-weight:700}
.post-cat a{color:var(--pink);text-decoration:none}
.post-series{color:var(--gold)}
.post-head h1{font-family:var(--serif);font-weight:800;font-size:clamp(28px,4.2vw,42px);line-height:1.45;margin:0 0 16px;letter-spacing:.01em}
.post-lead{color:var(--text2);font-size:17px;margin:0 0 16px}
.post-meta{display:flex;flex-wrap:wrap;gap:4px 18px;color:var(--muted);font-size:13px;margin:0}
.post-hero{margin:20px auto 8px;max-width:calc(var(--read) + 280px)}
.post-hero img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--radius);border:1px solid var(--line)}
.post-grid{display:grid;grid-template-columns:220px minmax(0,var(--read));gap:48px;justify-content:center;padding-top:24px;padding-bottom:56px}
.post-side{position:relative}
.toc{position:sticky;top:88px;font-size:13px;line-height:1.6;border-left:1px solid var(--line2);padding-left:14px;max-height:calc(100vh - 110px);overflow:auto}
.toc-title{margin:0 0 8px;font-size:12px;letter-spacing:.12em;color:var(--muted);font-weight:700}
.toc ol{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.toc a{color:var(--text2);text-decoration:none;display:block}
.toc a:hover,.toc a.on{color:#fff}
.toc a.on{box-shadow:-15px 0 0 -13px var(--pink)}

.prose{font-size:16.5px;line-height:2}
.prose>*:first-child{margin-top:0}
.prose p{margin:0 0 1.3em}
.prose h2{font-size:24px;line-height:1.5;margin:2.2em 0 .8em;padding-bottom:10px;border-bottom:1px solid var(--line2);position:relative}
.prose h2::before{content:"";position:absolute;left:0;bottom:-1px;width:72px;height:2px;background:linear-gradient(90deg,var(--pink),var(--cyan))}
.prose h3{font-size:19px;line-height:1.55;margin:1.8em 0 .6em;color:#fff}
.prose h4{font-size:17px;margin:1.5em 0 .5em}
.prose strong{color:#fff;font-weight:700;background:linear-gradient(transparent 62%,#f08ad433 0)}
.prose ul,.prose ol{padding-left:1.4em;margin:0 0 1.4em}
.prose li{margin:.35em 0}
.prose li::marker{color:var(--pink)}
.prose code{font-size:.92em;background:var(--panel2);border-radius:5px;padding:1px 6px}
.prose a{color:var(--cyan)}
.prose figure{margin:1.8em 0}
.prose figure img{border-radius:12px;cursor:zoom-in;margin:0 auto}
.prose figcaption{text-align:center;color:var(--muted);font-size:13px;margin-top:10px;line-height:1.6}
.prose .note,.prose blockquote{margin:1.6em 0;padding:16px 20px;border-left:3px solid var(--gold);background:#e2c17812;border-radius:0 10px 10px 0}
.prose .note>*:last-child,.prose blockquote>*:last-child{margin-bottom:0}
.prose details{margin:0 0 1.4em;border:1px solid var(--line2);border-radius:10px;padding:10px 16px;background:var(--panel)}
.prose details summary{cursor:pointer;color:var(--cyan);font-weight:700}
.prose details[open] summary{margin-bottom:8px}
.prose details>*:last-child{margin-bottom:0}
.table-wrap{overflow-x:auto;margin:0 0 1.5em;border:1px solid var(--line2);border-radius:10px}
.prose table{border-collapse:collapse;width:100%;font-size:14.5px;line-height:1.7}
.prose th,.prose td{padding:10px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.prose th{background:var(--panel2);font-weight:700;white-space:nowrap}
.prose tr:last-child td{border-bottom:0}

/* video */
.video{margin:0 0 36px;padding:16px;border:1px solid var(--line2);border-radius:var(--radius);background:linear-gradient(160deg,#1a1430,#0f1730)}
.video-head{display:flex;justify-content:space-between;gap:10px;margin-bottom:10px;font-size:13px;font-weight:700}
.video-no{color:var(--gold)}
.video-len{color:var(--muted)}
.video-play,.video-soon{position:relative;display:block;width:100%;padding:0;border:0;border-radius:10px;overflow:hidden;background:#000;aspect-ratio:16/9}
.video-play{cursor:pointer}
.video-play img,.video-soon img{width:100%;height:100%;object-fit:cover}
.play-icon{position:absolute;left:50%;top:50%;width:76px;height:54px;margin:-27px 0 0 -38px;border-radius:14px;background:#ff0033e6;box-shadow:0 8px 30px #0008}
.play-icon::after{content:"";position:absolute;left:31px;top:15px;border-style:solid;border-width:12px 0 12px 20px;border-color:transparent transparent transparent #fff}
.video-play:hover .play-icon{background:#ff0033}
.video iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:10px;display:block}
.soon-label{position:absolute;left:12px;bottom:12px;background:#080c1bdd;border:1px solid #ffffff33;color:#fff;font-size:13px;font-weight:700;border-radius:999px;padding:4px 14px}
.video-note{margin:10px 0 0;color:var(--muted);font-size:12.5px;line-height:1.7}
.video-chapters{margin-top:10px;font-size:14px}
.video-chapters summary{cursor:pointer;color:var(--cyan);font-weight:700;font-size:13px}
.video-chapters ol{list-style:none;margin:8px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 18px}
.video-chapters li{display:flex;gap:10px;line-height:1.6}
.video-chapters a{color:var(--text2);text-decoration:none}
.video-chapters a:hover{color:#fff}
.time{color:var(--gold);font-variant-numeric:tabular-nums;min-width:3.2em;display:inline-block}

.series{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:40px 0 0}
.series-link{display:flex;flex-direction:column;gap:2px;padding:14px 16px;border:1px solid var(--line2);border-radius:12px;text-decoration:none;color:var(--text);background:var(--panel)}
.series-link:last-of-type{text-align:right}
.series-link span{font-size:12px;color:var(--muted)}
.series-link strong{font-size:15px;line-height:1.5}
.series-link:hover{border-color:var(--pink);color:#fff}
.series-all{grid-column:1/-1;text-align:center;font-size:14px}
.post-foot{margin-top:40px;display:grid;gap:24px}
.cta{padding:22px 24px;border-radius:var(--radius);border:1px solid #f08ad455;background:linear-gradient(135deg,#2a1230,#111a31)}
.cta-title{margin:0 0 6px;font-weight:700;font-size:18px}
.cta p{margin:0 0 14px;color:var(--text2);font-size:14.5px}
.cta .cta-buttons{margin:0}
.related{padding-bottom:64px}
.related h2{font-size:22px;margin:0 0 18px}

/* search */
.search-form{display:flex;gap:10px;max-width:640px}
.search-form input{flex:1;min-width:0;min-height:48px;border-radius:999px;border:1px solid var(--line2);background:var(--panel);color:var(--text);padding:0 20px;font:inherit;font-size:16px}
.search-form input:focus{border-color:var(--cyan);outline:none;box-shadow:0 0 0 3px #85d4f733}
.search-status{color:var(--muted);font-size:14px;margin:0 0 18px}

/* lightbox */
.lightbox{border:0;padding:0;background:transparent;max-width:96vw;max-height:94vh}
.lightbox::backdrop{background:#000d}
.lightbox img{max-width:96vw;max-height:90vh;width:auto;border-radius:10px}
.lightbox button{position:fixed;top:14px;right:14px;width:44px;height:44px;border-radius:50%;border:1px solid #fff5;background:#0008;color:#fff;font-size:22px;cursor:pointer}

/* footer */
.site-footer{border-top:1px solid var(--line);background:#060914;margin-top:24px}
.footer-in{display:grid;grid-template-columns:1.1fr 2fr;gap:40px;padding-top:40px;padding-bottom:24px}
.footer-brand p{color:var(--muted);font-size:13px;line-height:1.8;max-width:30em}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-cols h2{font-size:12px;letter-spacing:.14em;color:var(--muted);margin:0 0 10px}
.footer-cols a{display:block;color:var(--text2);text-decoration:none;font-size:14px;padding:4px 0}
.footer-cols a:hover{color:#fff}
.copyright{color:var(--muted);font-size:12px;padding-bottom:32px;margin:0}

@media (max-width:1000px){
 .post-grid{grid-template-columns:minmax(0,var(--read));gap:0}
 .post-side{display:none}
 .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
 .hero-in{grid-template-columns:1fr;gap:28px}
 .lesson-list{grid-template-columns:1fr}
 .site-nav{display:none}
 .header-tools{margin-left:auto}
}
@media (max-width:640px){
 body{font-size:15.5px}
 .prose{font-size:16px;line-height:1.95}
 .prose h2{font-size:21px}
 .cards{grid-template-columns:1fr}
 .home-hero{padding-top:32px}
 .lesson a{grid-template-columns:1fr}
 .series{grid-template-columns:1fr}
 .series-link:last-of-type{text-align:left}
 .video-chapters ol{grid-template-columns:1fr}
 .footer-in,.footer-cols{grid-template-columns:1fr}
 .header-play{display:none}
 .brand-name{font-size:15px}
}
@media (max-width:1000px){.mobile-nav{display:flex}}
.mobile-nav{display:none;gap:4px;overflow-x:auto;scrollbar-width:none;padding:0 0 10px}
.mobile-nav::-webkit-scrollbar{display:none}
.mobile-nav a{font-size:13px;color:var(--text2);text-decoration:none;border:1px solid var(--line2);border-radius:999px;padding:4px 12px;white-space:nowrap}
.mobile-nav a[aria-current=page]{border-color:var(--pink);color:#fff}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}