/* ============ RESET & TOKENS ============ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#08090c;
  --bg-2:#0c0e13;
  --panel:#111319;
  --panel-2:#15171f;
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.14);
  --text:#eceef3;
  --muted:#9097a6;
  --muted-2:#6b7180;
  --blue:#2f7bff;
  --blue-2:#5b9bff;
  --blue-glow:rgba(47,123,255,.55);
  --amber:#fbbf24;
  --amber-2:#fcd34d;
  --radius:16px;
  --maxw:1140px;
  --font:"Inter","Noto Sans JP",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
h1,h2,h3{line-height:1.12;letter-spacing:-.02em;font-weight:800}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
mark{background:none}
kbd{
  font-family:var(--mono);font-size:.82em;
  background:rgba(255,255,255,.08);border:1px solid var(--line-2);
  border-bottom-width:2px;border-radius:6px;padding:.1em .45em;color:#fff;
}
code{font-family:var(--mono);font-size:.9em}
.grad{background:linear-gradient(110deg,#fff 10%,var(--blue-2) 60%,var(--blue) 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.grad-amber{background:linear-gradient(110deg,#fff,var(--amber-2) 60%,var(--amber));-webkit-background-clip:text;background-clip:text;color:transparent}

/* ============ NAV ============ */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;transition:background .3s,border-color .3s,backdrop-filter .3s;border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(8,9,12,.72);backdrop-filter:blur(14px);border-bottom-color:var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;letter-spacing:-.02em}
.brand-mark{color:var(--blue-2);display:flex}
.brand-name{font-size:1.12rem}
.nav-links{display:flex;gap:26px;margin-left:8px}
.nav-links a{color:var(--muted);font-size:.92rem;font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--text)}
.nav-cta{margin-left:auto;display:flex;align-items:center;gap:18px}
.ghost-link{color:var(--muted);font-size:.92rem;font-weight:500;transition:color .2s}
.ghost-link:hover{color:var(--text)}

/* ============ BUTTONS ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:600;border-radius:10px;cursor:pointer;transition:transform .15s,box-shadow .25s,background .2s,border-color .2s;white-space:nowrap}
.btn-sm{padding:8px 16px;font-size:.9rem}
.btn-lg{padding:14px 26px;font-size:1.02rem}
.btn-primary{background:linear-gradient(180deg,var(--blue-2),var(--blue));color:#fff;box-shadow:0 6px 22px -6px var(--blue-glow),inset 0 1px 0 rgba(255,255,255,.25)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 34px -8px var(--blue-glow),inset 0 1px 0 rgba(255,255,255,.3)}
.btn-secondary{background:rgba(255,255,255,.04);color:var(--text);border:1px solid var(--line-2)}
.btn-secondary:hover{background:rgba(255,255,255,.09);border-color:rgba(255,255,255,.25);transform:translateY(-2px)}

/* ============ HERO ============ */
.hero{position:relative;padding:148px 0 80px;text-align:center;overflow:hidden}
.hero-glow{position:absolute;top:-180px;left:50%;transform:translateX(-50%);width:1100px;height:760px;
  background:radial-gradient(50% 50% at 50% 50%,rgba(47,123,255,.28),transparent 70%);
  filter:blur(20px);pointer-events:none;z-index:0}
.grid-bg{position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:54px 54px;
  mask-image:radial-gradient(120% 90% at 50% 0%,#000 30%,transparent 75%);
  -webkit-mask-image:radial-gradient(120% 90% at 50% 0%,#000 30%,transparent 75%);
  opacity:.5}
.hero-inner{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center}
.pill{display:inline-flex;align-items:center;gap:10px;padding:7px 8px 7px 16px;border-radius:999px;
  background:rgba(255,255,255,.04);border:1px solid var(--line-2);font-size:.86rem;color:var(--muted);
  font-weight:500;margin-bottom:30px;transition:border-color .2s,color .2s}
.pill:hover{border-color:rgba(91,155,255,.5);color:var(--text)}
.pill-dot{width:7px;height:7px;border-radius:50%;background:var(--blue-2);box-shadow:0 0 10px var(--blue-2)}
.pill-arrow{background:rgba(255,255,255,.07);border-radius:50%;width:22px;height:22px;display:grid;place-items:center;font-size:.8rem}
.hero-title{font-size:clamp(2.6rem,6.4vw,5rem);margin-bottom:24px;letter-spacing:-.035em}
.hero-sub{max-width:640px;font-size:clamp(1.02rem,1.7vw,1.22rem);color:var(--muted);margin-bottom:36px}
.hero-sub strong{color:var(--text);font-weight:600}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.hero-note{margin-top:22px;color:var(--muted-2);font-size:.85rem;letter-spacing:.01em}

/* ============ APP MOCKUP ============ */
.app-shell{position:relative;margin-top:64px;width:100%;max-width:980px;perspective:1600px}
.app-shell::after{content:"";position:absolute;inset:auto 8% -40px;height:120px;background:radial-gradient(50% 100% at 50% 0,rgba(47,123,255,.35),transparent 70%);filter:blur(28px);z-index:-1}
.app-window{border:1px solid var(--line-2);border-radius:14px;overflow:hidden;background:var(--panel);
  box-shadow:0 40px 120px -30px rgba(0,0,0,.8),0 0 0 1px rgba(255,255,255,.03);text-align:left}
.app-titlebar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--panel-2);border-bottom:1px solid var(--line)}
.dot{width:11px;height:11px;border-radius:50%}
.dot.r{background:#ff5f57}.dot.y{background:#febc2e}.dot.g{background:#28c840}
.app-toolbar{display:flex;align-items:center;gap:12px;margin-left:14px;font-size:.78rem;color:var(--muted);overflow:hidden}
.tb-btn{background:rgba(91,155,255,.15);color:var(--blue-2);padding:4px 10px;border-radius:7px;font-weight:600;white-space:nowrap}
.tb-file{font-family:var(--mono);color:var(--muted-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tb-page{margin-left:auto;white-space:nowrap}
.app-body{display:grid;grid-template-columns:1.25fr 1fr;min-height:340px}
.pdf-pane{padding:26px 26px;font-size:.92rem;line-height:1.85;color:#cfd4df;border-right:1px solid var(--line);background:
  linear-gradient(180deg,rgba(255,255,255,.015),transparent)}
.pdf-pane p{margin-bottom:14px}
.pdf-pane .dim{color:var(--muted-2)}
.pdf-pane mark.sel{background:rgba(47,123,255,.28);color:#fff;border-radius:3px;box-shadow:0 0 0 1px rgba(91,155,255,.5)}
.explain-chip{display:inline-block;margin-left:8px;font-size:.72rem;background:linear-gradient(180deg,var(--blue-2),var(--blue));color:#fff;
  padding:2px 9px;border-radius:6px;font-weight:600;vertical-align:middle;box-shadow:0 4px 14px -4px var(--blue-glow)}
.explain-pane{padding:20px 20px;background:var(--bg-2);display:flex;flex-direction:column;gap:12px}
.ex-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:2px}
.ex-tag{font-weight:700;font-size:.9rem}
.ex-live{font-size:.72rem;color:#34d399;font-family:var(--mono)}
.ex-card{background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.ex-label{font-size:.74rem;color:var(--muted);font-weight:600;margin-bottom:5px}
.ex-card p{font-size:.84rem;line-height:1.7;color:#d7dbe4}
.ex-card b{color:#fff}
.caret{display:inline-block;width:8px;height:1.05em;background:var(--blue-2);margin-left:2px;vertical-align:-2px;animation:blink 1s steps(2) infinite;border-radius:1px}
@keyframes blink{50%{opacity:0}}

/* ============ STRIP ============ */
.strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg-2)}
.strip-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:42px 24px}
.stat{text-align:center}
.stat-n{font-size:clamp(1.8rem,3.4vw,2.5rem);font-weight:800;letter-spacing:-.03em;background:linear-gradient(180deg,#fff,#aab3c5);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-n span{font-size:.5em;color:var(--muted);-webkit-text-fill-color:var(--muted);margin-left:3px}
.stat-l{color:var(--muted);font-size:.86rem;margin-top:6px}

/* ============ SECTIONS ============ */
.section{padding:110px 0;position:relative}
.eyebrow{display:inline-block;font-family:var(--mono);font-size:.78rem;letter-spacing:.18em;color:var(--blue-2);
  font-weight:600;margin-bottom:16px;text-transform:uppercase}
.eyebrow.amber{color:var(--amber-2)}
.sec-head{text-align:center;max-width:680px;margin:0 auto 56px}
.sec-head h2{font-size:clamp(1.9rem,4vw,2.9rem)}
.sec-lead{color:var(--muted);font-size:1.05rem;margin-top:18px}
.sp{display:none}

/* ============ FEATURES ============ */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feat-card{background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;transition:transform .25s,border-color .25s,box-shadow .25s;position:relative;overflow:hidden}
.feat-card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:0 20px 50px -24px rgba(0,0,0,.7)}
.feat-card.big{grid-column:span 3;display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:28px;padding:36px}
.feat-icon{width:50px;height:50px;display:grid;place-items:center;border-radius:12px;
  background:rgba(91,155,255,.12);border:1px solid rgba(91,155,255,.2);margin-bottom:18px;color:var(--blue-2)}
.feat-card h3{font-size:1.2rem;margin-bottom:10px;font-weight:700}
.feat-card.big h3{font-size:1.5rem}
.feat-card p{color:var(--muted);font-size:.94rem}
.feat-card b{color:var(--text);font-weight:600}
.feat-text{padding-right:10px}
.feat-visual{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:22px}
.mini-stream{display:flex;flex-direction:column;gap:14px}
.ms-row{display:flex;align-items:center;gap:12px}
.ms-tag{font-size:.72rem;font-weight:700;color:var(--blue-2);min-width:34px}
.ms-tag.amber{color:var(--amber-2)}
.ms-bar{height:9px;border-radius:5px;background:linear-gradient(90deg,rgba(91,155,255,.55),rgba(91,155,255,.12))}
.ms-bar.w90{width:90%}.ms-bar.w80{width:80%}.ms-bar.w70{width:70%}
.ms-bar.amber{background:linear-gradient(90deg,rgba(251,191,36,.6),rgba(251,191,36,.12))}
.ms-bar.type{animation:grow 2.4s ease-in-out infinite alternate}
@keyframes grow{from{width:30%}to{width:80%}}

/* ============ HOW ============ */
.steps{display:flex;align-items:stretch;gap:0;justify-content:center;flex-wrap:wrap}
.step{flex:1;min-width:220px;max-width:300px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:border-color .25s,transform .25s}
.step:hover{border-color:var(--line-2);transform:translateY(-3px)}
.step-n{font-family:var(--mono);font-size:.95rem;color:var(--blue-2);font-weight:600;margin-bottom:14px}
.step h3{font-size:1.15rem;margin-bottom:8px}
.step p{color:var(--muted);font-size:.92rem}
.step-arrow{display:grid;place-items:center;padding:0 14px;color:var(--muted-2);font-size:1.4rem;flex:0 0 auto}

/* ============ PRIVACY ============ */
.privacy{padding-top:40px}
.privacy-card{position:relative;background:linear-gradient(160deg,var(--panel),var(--bg-2));border:1px solid var(--line-2);
  border-radius:24px;padding:64px clamp(28px,6vw,80px);overflow:hidden;text-align:center}
.privacy-glow{position:absolute;top:-120px;right:-80px;width:460px;height:460px;
  background:radial-gradient(circle,rgba(251,191,36,.18),transparent 65%);filter:blur(20px)}
.privacy-card h2{font-size:clamp(1.9rem,4.2vw,3rem);margin-bottom:22px;position:relative}
.privacy-lead{position:relative;max-width:640px;margin:0 auto 36px;color:var(--muted);font-size:1.06rem}
.privacy-points{position:relative;display:grid;grid-template-columns:repeat(2,1fr);gap:14px;max-width:680px;margin:0 auto;text-align:left}
.pp{display:flex;align-items:flex-start;gap:11px;font-size:.95rem;color:#d7dbe4}
.pp code{color:var(--amber-2)}
.pp-i{color:#1a1205;background:var(--amber);width:20px;height:20px;border-radius:50%;display:grid;place-items:center;font-size:.72rem;font-weight:800;flex:0 0 auto;margin-top:3px}

/* ============ REQUIREMENTS ============ */
.req-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;max-width:700px;margin:0 auto}
.req-card{background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:var(--radius);
  padding:32px;text-align:center;transition:transform .25s,border-color .25s}
.req-card:hover{transform:translateY(-3px);border-color:var(--line-2)}
.req-icon{margin-bottom:14px;color:var(--blue-2)}
.req-card h3{font-size:1.15rem;margin-bottom:8px}
.req-card p{color:var(--muted);font-size:.94rem}

/* ============ CTA ============ */
.cta{padding:120px 0}
.cta-inner{position:relative;text-align:center;border:1px solid var(--line-2);border-radius:24px;
  padding:72px 24px;background:linear-gradient(180deg,var(--panel),var(--bg));overflow:hidden}
.cta-glow{position:absolute;bottom:-200px;left:50%;transform:translateX(-50%);width:760px;height:420px;
  background:radial-gradient(50% 50% at 50% 50%,rgba(47,123,255,.3),transparent 70%);filter:blur(20px)}
.cta-inner h2{position:relative;font-size:clamp(2rem,4.6vw,3.2rem);margin-bottom:16px}
.cta-inner p{position:relative;color:var(--muted);font-size:1.08rem;margin-bottom:32px}
.cta-inner .hero-actions{position:relative}

/* ============ FOOTER ============ */
.footer{border-top:1px solid var(--line);padding:56px 0 32px;background:var(--bg-2)}
.footer-inner{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:32px;border-bottom:1px solid var(--line)}
.foot-brand .brand-name{font-size:1.2rem;font-weight:800}
.foot-brand p{color:var(--muted);font-size:.9rem;margin-top:8px;max-width:460px}
.foot-links{display:flex;gap:28px;flex-wrap:wrap;align-items:center}
.foot-links a{color:var(--muted);font-size:.92rem;transition:color .2s}
.foot-links a:hover{color:var(--text)}
.foot-bottom{display:flex;justify-content:space-between;color:var(--muted-2);font-size:.84rem;padding-top:24px}

/* ============ REVEAL ANIM ============ */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.ms-bar.type,.caret{animation:none}}

/* ============ RESPONSIVE ============ */
@media(max-width:880px){
  .nav-links{display:none}
  .feat-grid{grid-template-columns:1fr 1fr}
  .feat-card.big{grid-column:span 2;grid-template-columns:1fr}
  .req-grid{grid-template-columns:1fr}
  .step-arrow{transform:rotate(90deg)}
}
@media(max-width:640px){
  .hero{padding-top:120px}
  .nav-cta .ghost-link{display:none}
  .app-body{grid-template-columns:1fr}
  .pdf-pane{border-right:none;border-bottom:1px solid var(--line)}
  .strip-inner{grid-template-columns:repeat(2,1fr);gap:32px 16px}
  .feat-grid{grid-template-columns:1fr}
  .feat-card.big{grid-column:span 1}
  .privacy-points{grid-template-columns:1fr}
  .sp{display:inline}
  .foot-bottom{flex-direction:column;gap:6px}
}