:root{color-scheme:light;--ink:#172b24;--green:#175a43;--muted:#53665d;--line:#d7e1db;--paper:#f7faf8}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.65}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:5px}a:focus-visible{outline:3px solid var(--green);outline-offset:5px}.shell{width:min(1120px,calc(100% - 64px));margin:auto}.header{display:flex;align-items:center;justify-content:space-between;padding:28px 0;border-bottom:1px solid var(--line);gap:20px}.brand{font-size:19px;letter-spacing:.09em;font-weight:750}.brand span{display:block;font-size:10px;letter-spacing:.19em;color:var(--muted);margin-top:3px}.home-link{font-size:13px;color:var(--muted)}.languages{display:flex;flex-wrap:wrap;gap:4px 20px;padding:16px 0;font-size:13px}.languages a{display:flex;align-items:center;min-height:40px;color:var(--muted)}.languages a[aria-current]{color:var(--green);font-weight:750;text-decoration:underline;text-underline-offset:7px}.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:64px;align-items:center;padding:40px 0 72px}.eyebrow{font-size:13px;color:var(--green);font-weight:650;margin:0 0 20px}.hero h1,.home h1{font-size:clamp(36px,4.3vw,58px);line-height:1.18;letter-spacing:-.045em;margin:0 0 24px;text-wrap:balance;font-weight:720;overflow-wrap:anywhere}.lead{font-size:21px;line-height:1.6;margin:0 0 20px;letter-spacing:-.025em}.intro{max-width:44ch;color:var(--muted);font-size:16px;margin:0 0 28px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:26px;min-height:50px;padding:12px 24px;background:var(--green);color:white;border:1px solid var(--green);border-radius:4px;font-size:15px;font-weight:600}.button:hover{background:#104c37;text-decoration:none}.release{font-size:13px;color:var(--muted);margin:14px 0 0}.app-shot{margin:0;max-width:370px;justify-self:end;width:100%}.screen{max-height:510px;overflow:hidden;border:1px solid #163e30;border-radius:8px;background:#10281e}.screen img{display:block;width:100%;height:auto}.app-shot figcaption{font-size:12px;color:var(--muted);text-align:center;padding-top:12px}.how{display:grid;grid-template-columns:1fr 1.1fr;gap:64px;padding:64px 0;border-top:1px solid var(--line)}h2{font-size:30px;line-height:1.4;letter-spacing:-.035em;font-weight:650;margin:0 0 22px;overflow-wrap:anywhere}.how ol{margin:0;padding-left:24px}.how li{padding:0 0 18px 10px;color:var(--muted)}.how li::marker{color:var(--green);font-weight:700}.details{display:grid;grid-template-columns:1fr 1fr;gap:0 64px;padding-bottom:40px}.detail{border-top:1px solid var(--line);padding:28px 0}.detail h2{font-size:20px;margin-bottom:14px}.detail p{color:var(--muted);font-size:15px;margin:0}.detail:last-child{grid-column:1/-1;max-width:820px}.footer{border-top:1px solid var(--line);padding:26px 0;display:flex;justify-content:space-between;font-size:12px;color:var(--muted);gap:20px}.skip{position:absolute;top:8px;left:8px;padding:10px 18px;background:var(--green);color:white;transform:translateY(-200%);z-index:5}.skip:focus{transform:none}.home{padding:64px 0 24px}.home .lead{color:var(--muted)}.categories{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);padding:0;margin:48px 0}.categories li{border-top:1px solid var(--line);padding:20px 12px 20px 0;font-size:18px;min-width:0}.categories span{display:block;color:var(--muted);font-size:12px;margin-top:8px}.categories .active{color:var(--green);font-weight:700}.categories a{display:block;min-height:66px}.home-feature{padding:42px 0;display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;border-top:1px solid var(--line)}.home-feature p{color:var(--muted)}@media(max-width:760px){.shell{width:calc(100% - 36px)}.header{padding:20px 0}.brand{font-size:16px}.home-link{font-size:12px}.languages{gap:0 14px}.hero{grid-template-columns:1fr;gap:32px;padding:28px 0 40px}.hero h1,.home h1{font-size:38px}.lead{font-size:19px}.app-shot{justify-self:center;max-width:330px}.screen{max-height:400px}.how{grid-template-columns:1fr;gap:20px;padding:40px 0}.how h2{font-size:28px}.details{grid-template-columns:1fr;gap:0}.detail:last-child{grid-column:auto}.categories{grid-template-columns:repeat(2,1fr);margin:32px 0}.home{padding-top:40px}.home-feature{grid-template-columns:1fr;gap:20px}.footer{font-size:11px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media(min-width:761px) and (max-width:1000px){.hero{gap:32px}.hero h1{font-size:43px}.how{gap:32px}}

.coaching{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start;padding:56px 0;border-top:1px solid var(--line)}.coaching figure{margin:0;width:100%;max-width:430px;justify-self:end}.coaching img{display:block;width:100%;height:auto}.coaching figcaption{font-size:12px;color:var(--muted);text-align:center;padding-top:12px}@media(max-width:760px){.coaching{grid-template-columns:1fr;gap:24px;padding:40px 0}.coaching figure{justify-self:center}.coaching h2{font-size:28px}}

.hero{display:block;padding:32px 0 36px}.hero-copy{max-width:740px}.hero .intro{max-width:64ch}.phone-showcase{padding:36px 0 56px;border-top:1px solid var(--line)}.phone-showcase>.intro{max-width:70ch}.phone-sequence{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.phone-sequence figure{margin:0;min-width:0}.phone-sequence figcaption{min-height:64px;font-size:15px;font-weight:650;line-height:1.5;padding-bottom:16px}.phone-sequence figcaption span{display:block;color:var(--green);font-size:12px;margin-bottom:5px}.phone-frame{border:7px solid #17221d;border-radius:24px;overflow:hidden;background:#07130f}.phone-frame img{display:block;width:100%;height:auto}.phone-showcase h2{font-size:28px}@media(max-width:760px){.phone-sequence{grid-template-columns:1fr;gap:32px}.phone-sequence figure{width:min(340px,100%);justify-self:center}.phone-sequence figcaption{min-height:0}.phone-showcase{padding:28px 0 40px}.hero{padding:28px 0 32px}}

/* Shared presentation rules for home and app introduction. */
.details{grid-template-columns:repeat(2,minmax(0,1fr))}.detail{min-width:0}html:lang(ja) h1,html:lang(ja) h2,html:lang(ja) h3,html:lang(ja) p{word-break:normal}
body{font-size:16px;line-height:1.7;font-weight:400}h1,h2,h3,p{word-break:keep-all;overflow-wrap:break-word}.header{position:relative;flex-wrap:wrap;gap:16px;padding:22px 0}.brand{font-weight:700}.brand span{font-size:11px}.home-link{margin-left:auto;font-size:14px}.hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);align-items:center;gap:48px;padding:48px 0 56px}.hero-copy{max-width:650px}.hero h1,.home h1{font-size:52px;line-height:1.28;letter-spacing:-.02em;font-weight:700;margin:0 0 16px;overflow-wrap:normal}.hero h1>span{display:block}.eyebrow{margin:0 0 10px;font-weight:600;font-size:14px}.lead{font-size:21px;line-height:1.6;letter-spacing:-.01em;margin:0 0 14px}.intro,.hero .intro{margin:0 0 20px;max-width:60ch;font-size:16px;line-height:1.7}.scope{font-size:14px;color:var(--muted);margin:0 0 24px}.button{font-size:16px;min-height:50px;font-weight:600;gap:16px}.release{margin:8px 0 0;font-size:14px}.representative{margin:0;justify-self:center;width:min(100%,280px)}.representative img{display:block;width:100%;height:auto;max-height:500px;object-fit:contain;background:#10281e;border:1px solid var(--line);border-radius:8px}.zoom-label{display:block;text-align:center;padding:10px 8px;font-size:14px;font-weight:600;color:var(--green)}h2,.phone-showcase h2{font-size:30px;font-weight:600;line-height:1.35;letter-spacing:-.02em;margin:0 0 14px}h3{font-size:19px;line-height:1.5;font-weight:600;margin:0 0 8px}.phone-showcase,.pricing,.next-action,.home-purpose{padding:48px 0;border-top:1px solid var(--line)}.phone-showcase>.intro{margin-bottom:24px}.phone-sequence{gap:28px;align-items:start}.phone-sequence figcaption{min-height:150px;padding:0 0 20px;font-size:16px;font-weight:400}.phone-sequence figcaption>span{font-size:14px;font-weight:600;margin-bottom:8px}.phone-sequence figcaption p{margin:0;color:var(--muted);font-size:16px}.phone-frame{border:1px solid var(--line);border-radius:8px;max-height:340px;overflow:hidden}.phone-frame img{width:100%;height:auto}.phone-sequence figure:first-child .phone-frame{max-height:340px}.phone-sequence figure:nth-child(2) img{margin-top:-18%}.phone-sequence figure:nth-child(3) img{margin-top:-35%}.details{gap:0 48px;padding-bottom:0}.detail{padding:32px 0}.detail h2{font-size:24px}.detail p,.detail dd{font-size:16px;line-height:1.7;color:var(--muted)}.detail:last-child{grid-column:1/-1;max-width:none}.pricing>p,.home-purpose>p{max-width:70ch;margin:0 0 14px;color:var(--muted)}dl{margin:0}dl>div{display:grid;grid-template-columns:112px minmax(0,1fr);gap:16px;border-bottom:1px solid var(--line);padding:12px 0}dt{font-weight:600}dd{margin:0}.category-nav{width:100%}.category-nav ul{display:flex;flex-wrap:wrap;gap:8px 24px;list-style:none;margin:0;padding:4px 0 0}.category-nav li{display:flex;align-items:baseline;gap:6px;font-weight:600;font-size:16px;min-height:32px}.category-nav small{font-size:12px;font-weight:400;color:var(--muted)}.language-menu{position:relative;margin-left:auto;font-size:14px}.language-menu summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:12px;min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:4px}.language-menu summary::-webkit-details-marker{display:none}.language-menu nav{position:absolute;right:0;top:calc(100% + 6px);z-index:4;background:var(--paper);border:1px solid var(--line);min-width:180px;padding:8px}.language-menu nav a{display:block;min-height:44px;padding:8px 12px}.language-menu a[aria-current]{font-weight:600;background:#e4eee8}.language-menu summary:focus-visible,button:focus-visible{outline:3px solid var(--green);outline-offset:3px}.image-dialog{border:0;padding:16px;background:var(--paper);max-width:calc(100vw - 24px);max-height:calc(100dvh - 24px)}.image-dialog::backdrop{background:rgba(0,0,0,.7)}.image-dialog img{display:block;max-width:100%;height:auto;margin:auto}.image-dialog button{display:block;margin:0 0 12px auto;min-width:44px;min-height:44px;font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--line);cursor:pointer}.footer{font-size:14px}
@media(max-width:760px){.shell{width:calc(100% - 36px)}.header{padding:16px 0;gap:10px}.home-link{display:none}.brand{font-size:15px}.hero{grid-template-columns:1fr;gap:24px;padding:32px 0 36px}.hero h1,.home h1{font-size:35px;line-height:1.28}.lead{font-size:19px}.representative{width:min(100%,230px)}.representative img{max-height:400px}.phone-showcase,.pricing,.next-action,.home-purpose{padding:36px 0}h2,.phone-showcase h2,.detail h2{font-size:25px;line-height:1.36}.phone-showcase h2>span{display:block}.phone-sequence{grid-template-columns:1fr;gap:28px}.phone-sequence figure{width:100%;display:grid;grid-template-columns:minmax(0,1fr) 130px;column-gap:16px;align-items:start}.phone-sequence figure figcaption{min-height:0;padding:0}.phone-sequence figure>a{min-width:0}.phone-frame,.phone-sequence figure:first-child .phone-frame{max-height:230px}.zoom-label{font-size:13px;line-height:1.5;padding:8px 0}.phone-sequence figcaption p{font-size:15px}.details{grid-template-columns:1fr;gap:0}.detail:last-child{grid-column:auto}.detail{padding:28px 0}dl>div{grid-template-columns:100px minmax(0,1fr);gap:12px}.category-nav ul{gap:4px 16px}.category-nav li{font-size:15px;min-height:28px}.category-nav small{font-size:11px}.home-header{gap:12px}.footer{font-size:13px}.next-action .button{max-width:100%}}
@media(min-width:761px) and (max-width:1000px){.hero{gap:28px}.hero h1{font-size:44px}.phone-sequence{gap:16px}.phone-sequence figcaption{min-height:180px}}

@font-face{font-family:Pretendard;src:url("/billiard-coach/fonts/PretendardVariable.woff2") format("woff2");font-weight:100 900;font-display:swap}
@font-face {
  font-family: 'Noto Sans';
  font-style: normal;
  font-weight: 400;
  font-stretch: normal;
  font-display: swap;
  src: url(/billiard-coach/fonts/NotoSans-0.woff2) format('truetype');
}
@font-face {
  font-family: 'Noto Sans';
  font-style: normal;
  font-weight: 500;
  font-stretch: normal;
  font-display: swap;
  src: url(/billiard-coach/fonts/NotoSans-1.woff2) format('truetype');
}
@font-face {
  font-family: 'Noto Sans';
  font-style: normal;
  font-weight: 600;
  font-stretch: normal;
  font-display: swap;
  src: url(/billiard-coach/fonts/NotoSans-2.woff2) format('truetype');
}
@font-face {
  font-family: 'Noto Sans';
  font-style: normal;
  font-weight: 700;
  font-stretch: normal;
  font-display: swap;
  src: url(/billiard-coach/fonts/NotoSans-3.woff2) format('truetype');
}

@font-face {
  font-family: 'Noto Sans JP';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(/billiard-coach/fonts/NotoSansJP-0.woff2) format('truetype');
}
@font-face {
  font-family: 'Noto Sans JP';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(/billiard-coach/fonts/NotoSansJP-1.woff2) format('truetype');
}
@font-face {
  font-family: 'Noto Sans JP';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(/billiard-coach/fonts/NotoSansJP-2.woff2) format('truetype');
}
@font-face {
  font-family: 'Noto Sans JP';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(/billiard-coach/fonts/NotoSansJP-3.woff2) format('truetype');
}

body{font-family:"Noto Sans",sans-serif}html:lang(ko) body{font-family:Pretendard,"Noto Sans",sans-serif}html:lang(ja) body{font-family:"Noto Sans JP","Noto Sans",sans-serif}