@property --angle {
  syntax: '<angle>';
  initial-value: 0deg;
  inherits: false;
}
@keyframes border-spin {
  to { --angle: 360deg; }
}

:root{
  --g-blue:#4285F4; --g-red:#EA4335; --g-yellow:#FBBC05; --g-green:#34A853;
  --ink:#3C4043; --ink-soft:#5F6368; --line:#E8EAED; --bg:#FFFFFF; --bg-soft:#F8F9FA;
  --radius:16px;
  --grad-full:linear-gradient(120deg,#4285F4 0%,#EA4335 35%,#FBBC05 65%,#34A853 100%);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter','Noto Sans JP','Hiragino Kaku Gothic ProN',sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:inherit;text-decoration:none}
h2{font-size:clamp(24px,3.6vw,38px);font-weight:800;letter-spacing:-.5px;text-align:center}
.sec-sub{text-align:center;color:var(--ink-soft);margin:10px auto 0;max-width:640px;font-size:15px}

/* header */
.site-head{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px clamp(16px,4vw,48px);background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;flex-shrink:0}
.brand-logo-img{height:58px;width:auto;max-width:none;display:block;flex-shrink:0}
.head-nav{display:flex;gap:26px;font-size:14px;font-weight:600;color:var(--ink-soft)}
.head-nav a:hover{color:var(--g-blue)}
.head-right{display:flex;align-items:center;gap:12px}
.lang-box{display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:24px;padding:5px 12px;background:#fff}
.lang-globe{font-size:14px}
#lang-select{appearance:none;border:none;background:none;font-family:inherit;font-size:13px;font-weight:600;color:var(--ink);cursor:pointer;outline:none;max-width:130px}

/* buttons */
.btn{display:inline-block;font-weight:700;border-radius:28px;padding:13px 30px;font-size:15px;transition:.18s;text-align:center}
.btn-sm{padding:8px 20px;font-size:13px}
.btn-primary{background:var(--g-blue);color:#fff;box-shadow:0 4px 18px rgba(66,133,244,.50)}
.btn-primary:hover{background:#3367D6;transform:translateY(-1px);box-shadow:0 6px 24px rgba(66,133,244,.60)}
.btn-ghost{border:1.5px solid transparent;color:var(--ink);background:linear-gradient(#fff,#fff) padding-box,var(--grad-full) border-box}
.btn-ghost:hover{color:var(--g-blue);transform:translateY(-1px)}
.btn-invert{background:#fff;color:var(--g-blue)}
.btn-invert:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(0,0,0,.18)}

/* language toast */
.lang-toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);z-index:200;display:flex;align-items:center;gap:14px;background:#202124;color:#fff;font-size:13px;padding:12px 18px;border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,.3);max-width:92vw}
.lang-toast button{background:none;border:none;color:#9AA0A6;font-size:14px;cursor:pointer}

/* hero */
.hero{padding:clamp(48px,8vw,96px) 20px 30px;background:
  radial-gradient(800px 420px at 10% -8%,rgba(66,133,244,.28),transparent),
  radial-gradient(700px 380px at 90% -4%,rgba(52,168,83,.24),transparent),
  radial-gradient(600px 360px at 72% 32%,rgba(251,188,5,.22),transparent),
  radial-gradient(600px 360px at 26% 40%,rgba(234,67,53,.18),transparent)}
.hero-inner{max-width:980px;margin:0 auto;text-align:center}

.hero-badge{display:inline-flex;align-items:center;gap:7px;border:1.5px solid transparent;background:linear-gradient(#fff,#fff) padding-box,var(--grad-full) border-box;border-radius:30px;padding:7px 16px;font-size:13px;font-weight:600;color:var(--ink-soft);box-shadow:0 2px 16px rgba(66,133,244,.18)}
.dot{width:8px;height:8px;border-radius:50%;display:inline-block}
.d-blue{background:var(--g-blue)}.d-red{background:var(--g-red)}.d-yellow{background:var(--g-yellow)}.d-green{background:var(--g-green)}
.hero-title{font-size:clamp(34px,6.4vw,68px);font-weight:800;letter-spacing:-1.5px;line-height:1.12;margin:22px 0 16px;background:linear-gradient(90deg,#4285F4 0%,#EA4335 30%,#FBBC05 60%,#34A853 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{max-width:680px;margin:0 auto;color:var(--ink-soft);font-size:clamp(15px,1.8vw,18px)}
.hero-cta{display:flex;gap:14px;justify-content:center;margin:30px 0 0;flex-wrap:wrap}

/* hero mock — Google AIスタイル: 点（コメット）が通ったところだけ色が出る */
.hero-mock-wrap{max-width:760px;margin:52px auto 0;padding:2.5px;border-radius:20px;
  background:
    conic-gradient(
      from var(--angle),
      transparent 0%,
      transparent 78%,
      #4285F4 82%,
      #EA4335 87%,
      #FBBC05 92%,
      #34A853 96%,
      transparent 100%
    ),
    #E8EAED;
  animation:border-spin 3.5s linear infinite;
  box-shadow:0 20px 60px rgba(60,64,67,.14)}
.hero-mock{background:#fff;border-radius:17px;overflow:hidden}
.mock-bar{display:flex;gap:6px;padding:11px 14px;border-bottom:1px solid var(--line)}
.mb{width:10px;height:10px;border-radius:50%}.mb.r{background:var(--g-red)}.mb.y{background:var(--g-yellow)}.mb.g{background:var(--g-green)}
.mock-body{display:grid;grid-template-columns:54px 220px 1fr;min-height:250px}
.mock-side{display:flex;flex-direction:column;gap:12px;align-items:center;padding:16px 0;border-inline-end:1px solid var(--line);background:var(--bg-soft)}
.mch{width:28px;height:28px;border-radius:10px;opacity:1}
.c-blue{background:var(--g-blue)}.c-green{background:var(--g-green)}.c-red{background:var(--g-red)}.c-yellow{background:var(--g-yellow)}
.mock-list{border-inline-end:1px solid var(--line);padding:12px}
.mrow{display:grid;grid-template-columns:8px 1fr;column-gap:9px;row-gap:5px;padding:10px;border-radius:10px;margin-bottom:4px}
.mrow.on{background:rgba(66,133,244,.10)}
.mtag{grid-row:1/3;width:8px;border-radius:4px}
.t-blue{background:var(--g-blue)}.t-green{background:var(--g-green)}.t-red{background:var(--g-red)}.t-yellow{background:var(--g-yellow)}
.mrow b{height:9px;border-radius:5px;background:#DADCE0;width:70%}
.mrow span{height:7px;border-radius:4px;background:#EDEFF1;width:90%}
.mock-pane{padding:18px;display:flex;flex-direction:column;gap:10px;justify-content:flex-end}
.bub{height:28px;border-radius:14px;width:62%;background:#EDEFF1}
.bub.short{width:42%}
.bub.out{background:rgba(66,133,244,.28);align-self:flex-end}

/* channels */
.channels{padding:clamp(56px,8vw,90px) 20px;background:var(--bg-soft)}
.ch-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px;max-width:1080px;margin:34px auto 0}
.ch-card{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:13px 15px;transition:.16s}
.ch-card:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(60,64,67,.13);border-color:transparent;background:linear-gradient(#fff,#fff) padding-box,var(--grad-full) border-box}
.ch-logo{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex:none}
.ch-logo img{width:22px;height:22px;display:block}
.ch-name{font-size:13.5px;font-weight:700;line-height:1.3}
.ch-cat{font-size:10.5px;color:var(--ink-soft)}

/* features */
.features{padding:clamp(56px,8vw,90px) 20px}
.f-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;max-width:1080px;margin:36px auto 0}
.f-card{border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;position:relative;overflow:hidden;background:#fff;transition:.16s}
.f-card::before{content:"";position:absolute;left:0;top:0;right:0;height:4px}
.fc-blue::before{background:var(--g-blue)}.fc-red::before{background:var(--g-red)}.fc-yellow::before{background:var(--g-yellow)}.fc-green::before{background:var(--g-green)}
.f-card:hover{transform:translateY(-4px);box-shadow:0 14px 36px rgba(60,64,67,.14)}
.f-ic{font-size:26px;margin-bottom:12px}
.f-card h3{font-size:16.5px;font-weight:800;margin-bottom:7px}
.f-card p{font-size:13.5px;color:var(--ink-soft)}

/* platforms */
.platforms{padding:clamp(56px,8vw,90px) 20px;background:var(--bg-soft)}
.p-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:16px;max-width:880px;margin:34px auto 0}
.p-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 18px;text-align:center;transition:.16s}
.p-card:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(60,64,67,.12);border-color:transparent;background:linear-gradient(#fff,#fff) padding-box,var(--grad-full) border-box}
.p-ic{width:58px;height:58px;border-radius:18px;margin:0 auto 14px;display:flex;align-items:center;justify-content:center;font-size:26px}
.pc-blue{background:rgba(66,133,244,.16)}.pc-red{background:rgba(234,67,53,.16)}.pc-yellow{background:rgba(251,188,5,.22)}.pc-green{background:rgba(52,168,83,.16)}
.p-card h3{font-size:15px;font-weight:800}

/* final cta */
.final-cta{margin:clamp(40px,6vw,70px) clamp(16px,4vw,48px);padding:clamp(48px,7vw,84px) 24px;border-radius:24px;text-align:center;color:#fff;background:linear-gradient(115deg,#4285F4 0%,#2E6AD6 40%,#1e9e5a 100%);box-shadow:0 20px 60px rgba(66,133,244,.40)}
.final-cta h2{color:#fff}
.final-cta p{opacity:.92;margin:10px 0 26px}

/* footer */
.site-foot{border-top:1px solid var(--line);padding:40px 20px 50px;text-align:center;color:var(--ink-soft);font-size:13px}
.foot-brand{display:inline-flex;align-items:center;margin-bottom:12px}
.foot-logo-img{height:44px;width:auto;display:block}
.foot-rights{margin-top:6px;font-size:11.5px;color:#9AA0A6}

/* RTL */
[dir="rtl"] .head-nav,[dir="rtl"] .hero-cta{direction:rtl}
[dir="rtl"] .bub.out{align-self:flex-start}
[dir="rtl"] .bub.in{align-self:flex-end}

/* responsive */
@media(max-width:760px){
  .head-nav{display:none}
  .mock-body{grid-template-columns:44px 1fr}
  .mock-pane{display:none}
  .hero-mock-wrap{margin-top:36px}
}