/* ============================================================
   Metsuke 目付 — metsuke.rmthreat.com
   Brand tokens from docs/design.md (warm paper · Fraunces ·
   Hanken Grotesk · yotsume crest · coral/amber/green/blue)
   ============================================================ */
:root{
  --paper:#FAF5EC; --paper2:#F3ECDD; --surface:#FFFFFF; --surface-warm:#FFFDF8;
  --ink:#23252E; --ink2:#5E6170; --ink3:#8E909B;
  --line:#ECE3D2; --line2:#E0D5BF;
  --blue:#1366E0; --blue-ink:#0B3D8C; --blue-soft:#E8F0FC;
  --coral:#DD5238; --coral-ink:#8C2C19; --coral-soft:#FBEAE4;
  --amber:#DD901F; --amber-ink:#7C4C08; --amber-soft:#FAF0DC;
  --green:#1C9C68; --green-ink:#0E5C3D; --green-soft:#E4F4EC;
  --r-lg:18px; --r-md:13px; --r-sm:10px;
  --shadow:0 16px 40px -22px rgba(74,54,28,.45),0 2px 6px -3px rgba(74,54,28,.18);
  --shadow-sm:0 6px 18px -12px rgba(74,54,28,.4);
  --sans:'Hanken Grotesk',-apple-system,system-ui,sans-serif;
  --serif:'Fraunces',Georgia,serif;
  --mono:ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; color:var(--ink); font-family:var(--sans); font-size:15px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
  background:
    radial-gradient(1100px 560px at 88% -6%, #FFF6E4, transparent 62%),
    radial-gradient(900px 500px at -10% 30%, #F6EEDE, transparent 55%),
    var(--paper);
}
a{color:var(--blue); text-decoration:none}
a:hover{text-decoration:underline}
::selection{background:var(--coral-soft); color:var(--coral-ink)}

/* ---- crest watermark pattern (faint yotsume diamonds) ---- */
.crest-field{position:relative; overflow:hidden}
.crest-field::before{
  content:''; position:absolute; inset:0; pointer-events:none; opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 96 96' width='96' height='96'%3E%3Cg fill='none' stroke='%2323252E' stroke-width='2.5'%3E%3Crect x='34' y='34' width='28' height='28' rx='1.5' transform='rotate(45 48 48)'/%3E%3Crect x='42' y='42' width='12' height='12' rx='1'/%3E%3C/g%3E%3C/svg%3E");
  background-size:96px 96px;
}

/* ---- layout ---- */
.wrap{max-width:1060px; margin:0 auto; padding:0 24px}
.section{padding:84px 0}
.section.tight{padding:60px 0}
.section-label{
  font-size:12px; font-weight:700; letter-spacing:.16em; text-transform:uppercase;
  color:var(--ink3); display:flex; align-items:center; gap:10px; margin:0 0 14px;
}
.section-label::before{content:''; width:26px; height:1.5px; background:var(--line2)}
h2{font-family:var(--serif); font-weight:600; font-size:clamp(24px,3.4vw,32px); letter-spacing:-.01em; margin:0 0 14px; line-height:1.25}
.sub{color:var(--ink2); max-width:620px; margin:0 0 36px}

/* ---- nav ---- */
.nav{position:sticky; top:0; z-index:50; backdrop-filter:blur(10px);
  background:color-mix(in srgb, var(--paper) 86%, transparent);
  border-bottom:1px solid var(--line)}
.nav-in{display:flex; align-items:center; gap:12px; height:62px}
.nav .brand{display:flex; align-items:center; gap:10px; color:var(--ink)}
.nav .brand:hover{text-decoration:none}
.nav .brand .nm{font-family:var(--serif); font-weight:600; font-size:17px}
.nav .brand .nm .jp{font-weight:500; margin-right:5px}
.nav-links{margin-left:auto; display:flex; align-items:center; gap:22px; font-size:13.5px; font-weight:600}
.nav-links a{color:var(--ink2)}
.nav-links a:hover{color:var(--ink); text-decoration:none}
.nav-links .cta{color:#fff; background:var(--blue); border-radius:999px; padding:8px 16px}
.nav-links .cta:hover{background:var(--blue-ink)}
@media(max-width:640px){.nav-links a:not(.cta):not(.lang a){display:none}}

/* ---- language switcher ---- */
.lang{display:inline-flex; align-items:center; border:1px solid var(--line2); border-radius:999px;
  background:var(--surface); padding:3px; gap:2px}
.lang a{font-size:12px; font-weight:600; color:var(--ink3); border-radius:999px; padding:4px 10px}
.lang a:hover{color:var(--ink); text-decoration:none}
.lang a.on{background:var(--ink); color:var(--paper)}

/* ---- badge / crest ---- */
.badge{flex:none; color:var(--ink); display:inline-flex}
.badge svg{width:100%; height:100%; display:block}
.b22{width:22px;height:22px}.b28{width:28px;height:28px}.b32{width:32px;height:32px}.b44{width:44px;height:44px}

/* ---- buttons ---- */
.btn{font-family:var(--sans); font-size:14px; font-weight:600; border-radius:999px; cursor:pointer;
  padding:11px 22px; border:1px solid var(--line2); background:var(--surface); color:var(--ink2);
  display:inline-flex; align-items:center; gap:8px; transition:background .15s, transform .06s}
.btn:hover{background:var(--paper); text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--blue); border-color:var(--blue); color:#fff}
.btn.primary:hover{background:var(--blue-ink)}
.btn.ghost{border-color:transparent; background:transparent; color:var(--ink3)}
.btn:focus-visible{outline:none; box-shadow:0 0 0 3px rgba(19,102,224,.25)}

/* ---- hero ---- */
.hero{padding:88px 0 70px; position:relative}
.hero-grid{display:grid; grid-template-columns:minmax(0,5fr) minmax(0,6fr); gap:54px; align-items:center}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr; gap:44px}}
.hero h1{font-family:var(--serif); font-weight:600; font-size:clamp(34px,5vw,52px);
  line-height:1.16; letter-spacing:-.015em; margin:18px 0 18px}
.hero h1 .coral{color:var(--coral)}
.hero .tagline{color:var(--ink2); font-size:16.5px; max-width:480px; margin:0 0 30px}
.hero .brandline{display:flex; align-items:center; gap:13px}
.hero .brandline .nm{font-family:var(--serif); font-weight:600; font-size:19px}
.hero .brandline .nm .jp{font-weight:500; margin-right:6px}
.hero .brandline .kicker{font-size:12px; font-weight:700; letter-spacing:.14em; text-transform:uppercase;
  color:var(--coral); background:var(--coral-soft); border-radius:999px; padding:4px 11px}
.hero-ctas{display:flex; gap:11px; flex-wrap:wrap; margin-bottom:26px}
.hero-meta{display:flex; gap:18px; flex-wrap:wrap; font-size:12.5px; color:var(--ink3); font-weight:500}
.hero-meta span{display:inline-flex; align-items:center; gap:6px}
.hero-meta .dot{width:7px; height:7px; border-radius:50%; background:var(--green)}

/* vertical tatebana accent */
.tate{position:absolute; right:0; top:96px; writing-mode:vertical-rl; font-family:var(--serif);
  font-size:13px; letter-spacing:.42em; color:var(--ink3); opacity:.7; user-select:none}
@media(max-width:1180px){.tate{display:none}}

/* ---- browser demo (hero visual) ---- */
.stage{background:var(--paper2); border:1px solid var(--line2); border-radius:var(--r-lg);
  padding:14px; box-shadow:var(--shadow-sm)}
.browser{background:var(--surface); border-radius:var(--r-md); overflow:hidden; border:1px solid var(--line)}
.chrome{display:flex; align-items:center; gap:7px; padding:11px 14px; border-bottom:1px solid var(--line); background:var(--surface-warm)}
.chrome .d{width:10px; height:10px; border-radius:50%; background:#E5D9C2}
.urlbar{margin-left:10px; flex:1; min-width:0; height:26px; border-radius:999px; background:var(--paper);
  border:1px solid var(--line); display:flex; align-items:center; padding:0 12px; font-size:12px; color:var(--ink3);
  white-space:nowrap; overflow:hidden}
.codepane{padding:14px 16px 6px; font-family:var(--mono); font-size:12px; line-height:1.7; color:var(--ink3); overflow:hidden}
.codepane .ln{display:flex; gap:14px; white-space:nowrap}
.codepane .no{color:var(--line2); width:18px; text-align:right; flex:none}
.codepane .hl{background:var(--coral-soft); color:var(--coral-ink); border-radius:4px; padding:0 4px}

.banner{margin:13px; border-radius:var(--r-md); background:var(--surface-warm);
  border:2px solid var(--coral); box-shadow:0 0 0 3px rgba(221,82,56,.12),var(--shadow); overflow:hidden}
.banner .accent{height:4px; background:var(--coral)}
.banner .body{padding:15px 17px}
.banner .top{display:flex; align-items:center; gap:12px}
.b-title{display:flex; flex-direction:column; gap:2px; flex:1; min-width:0}
.b-title .row1{display:flex; align-items:center; gap:9px; flex-wrap:wrap}
.b-title .nm{font-family:var(--serif); font-weight:600; font-size:15px}
.chip{font-size:11.5px; font-weight:600; padding:3px 9px; border-radius:999px; background:var(--coral-soft); color:var(--coral-ink); white-space:nowrap}
.b-title .head{font-size:15px; font-weight:600; margin-top:1px}
.b-actions{display:flex; align-items:center; gap:8px; flex:none}
.b-actions .btn{padding:8px 15px; font-size:13px}
.b-actions .btn.ghost{padding:8px 10px}
.findings{margin-top:13px; border-top:1px solid var(--line); padding-top:11px; display:flex; flex-direction:column; gap:9px}
.find{display:flex; align-items:flex-start; gap:11px; font-size:13.5px}
.sev{flex:none; margin-top:6px; width:8px; height:8px; border-radius:50%}
.sev.high{background:var(--coral)} .sev.med{background:var(--amber)} .sev.ok{background:var(--green)}
.find .t b{font-weight:600} .find .t span{color:var(--ink2); font-weight:400}
.mono{font-family:var(--mono); font-size:12.5px; background:var(--coral-soft); color:var(--coral-ink); padding:1px 6px; border-radius:6px}
.reveal{margin-top:11px; font-size:13px; font-weight:600; color:var(--blue)}

.banner.caution{border-color:var(--amber); box-shadow:0 0 0 3px rgba(221,144,31,.12),var(--shadow); max-width:440px}
.banner.caution .accent{height:3px; background:var(--amber)}
.banner.caution .body{padding:12px 14px}
.banner.caution .head{font-size:13.5px}
.banner.caution .chip{background:var(--amber-soft); color:var(--amber-ink)}

/* ---- trust strip ---- */
.strip{border-top:1px solid var(--line); border-bottom:1px solid var(--line); background:var(--surface-warm)}
.strip-in{display:grid; grid-template-columns:repeat(4,1fr); gap:14px; padding:22px 0}
@media(max-width:820px){.strip-in{grid-template-columns:repeat(2,1fr)}}
.strip .item{display:flex; align-items:center; gap:10px; font-size:13.5px; font-weight:600; color:var(--ink2); justify-content:center}
.strip .item .k{color:var(--green); font-size:16px}

/* ---- feature cards ---- */
.cards{display:grid; grid-template-columns:repeat(3,1fr); gap:18px}
@media(max-width:900px){.cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.cards{grid-template-columns:1fr}}
.card{background:var(--surface); border:1px solid var(--line); border-radius:var(--r-lg);
  padding:24px 22px; box-shadow:var(--shadow-sm); transition:transform .18s ease, box-shadow .18s ease}
.card:hover{transform:translateY(-3px); box-shadow:var(--shadow)}
.card .ico{width:42px; height:42px; border-radius:13px; display:flex; align-items:center; justify-content:center;
  font-size:19px; margin-bottom:15px}
.card .ico.coral{background:var(--coral-soft); color:var(--coral-ink)}
.card .ico.amber{background:var(--amber-soft); color:var(--amber-ink)}
.card .ico.blue{background:var(--blue-soft); color:var(--blue-ink)}
.card .ico.green{background:var(--green-soft); color:var(--green-ink)}
.card h3{font-family:var(--serif); font-weight:600; font-size:16.5px; margin:0 0 7px}
.card p{margin:0; font-size:13.5px; color:var(--ink2)}
.card .fam{display:inline-block; margin-top:13px; font-family:var(--mono); font-size:11px;
  color:var(--ink3); background:var(--paper); border:1px solid var(--line); border-radius:6px; padding:2px 8px}

/* ---- two-level alert compare ---- */
.compare{display:grid; grid-template-columns:1fr 1fr; gap:22px; align-items:start}
@media(max-width:860px){.compare{grid-template-columns:1fr}}
.compare .col h3{font-family:var(--serif); font-weight:600; font-size:17px; margin:16px 0 6px}
.compare .col p{color:var(--ink2); font-size:13.5px; margin:0}
.lvl{font-size:11.5px; font-weight:700; letter-spacing:.1em; text-transform:uppercase;
  border-radius:999px; padding:4px 11px; display:inline-block}
.lvl.alarm{background:var(--coral-soft); color:var(--coral-ink)}
.lvl.caution{background:var(--amber-soft); color:var(--amber-ink)}

/* ---- rules ---- */
.rules-head{display:flex; align-items:baseline; justify-content:space-between; gap:20px; flex-wrap:wrap}
.rules{display:grid; grid-template-columns:repeat(2,1fr); gap:10px; margin-top:26px}
@media(max-width:760px){.rules{grid-template-columns:1fr}}
.rule{display:flex; align-items:center; gap:12px; background:var(--surface); border:1px solid var(--line);
  border-radius:var(--r-sm); padding:11px 14px; font-size:13.5px}
.rule .id{font-family:var(--mono); font-size:11.5px; color:var(--ink3); flex:none; width:62px}
.rule .nm{font-weight:600; flex:1}
.rule .tag{font-family:var(--mono); font-size:10.5px; color:var(--ink3); background:var(--paper);
  border:1px solid var(--line); border-radius:6px; padding:1px 7px; flex:none}
.legend{display:flex; gap:18px; font-size:12.5px; color:var(--ink2); margin-top:18px; flex-wrap:wrap}
.legend span{display:inline-flex; align-items:center; gap:7px}
.legend .sev{margin-top:0}

/* ---- privacy band ---- */
.privacy-band{background:var(--surface-warm); border-top:1px solid var(--line); border-bottom:1px solid var(--line)}
.privacy-grid{display:grid; grid-template-columns:minmax(0,5fr) minmax(0,4fr); gap:50px; align-items:center}
@media(max-width:860px){.privacy-grid{grid-template-columns:1fr}}
.pledge{display:flex; flex-direction:column; gap:12px}
.pledge .row{display:flex; align-items:flex-start; gap:11px; font-size:14px}
.pledge .row .k{flex:none; width:22px; height:22px; border-radius:50%; background:var(--green-soft);
  color:var(--green-ink); display:flex; align-items:center; justify-content:center; font-size:12px; font-weight:700; margin-top:1px}
.pledge .row b{font-weight:600}
.pledge .row span{color:var(--ink2)}

/* ---- locale strip ---- */
.locales{display:flex; gap:12px; flex-wrap:wrap}
.loc{background:var(--surface); border:1px solid var(--line); border-radius:999px; padding:8px 18px;
  font-size:13.5px; font-weight:600; color:var(--ink2); display:inline-flex; gap:8px; align-items:center}
.loc .f{font-size:15px}

/* ---- footer ---- */
footer{border-top:1px solid var(--line); background:var(--surface-warm)}
.foot-in{display:flex; align-items:center; gap:14px; padding:30px 0; flex-wrap:wrap}
.foot-in .brand{display:flex; align-items:center; gap:9px; color:var(--ink); font-family:var(--serif); font-weight:600}
.foot-in .brand .jp{font-weight:500; margin-right:4px}
.foot-links{margin-left:auto; display:flex; gap:20px; font-size:13px; font-weight:600}
.foot-links a{color:var(--ink2)}
.foot-note{padding:0 0 26px; font-size:12px; color:var(--ink3)}

/* ---- reveal-on-scroll ---- */
@media(prefers-reduced-motion:no-preference){
  .rv{opacity:0; transform:translateY(14px); transition:opacity .6s ease, transform .6s ease}
  .rv.in{opacity:1; transform:none}
  .rv.d1{transition-delay:.08s}.rv.d2{transition-delay:.16s}.rv.d3{transition-delay:.24s}
}

/* ---- prose (privacy page) ---- */
.prose{max-width:720px}
.prose h1{font-family:var(--serif); font-weight:600; font-size:clamp(28px,4vw,38px); letter-spacing:-.01em; margin:10px 0 6px; line-height:1.2}
.prose .updated{font-size:13px; color:var(--ink3); margin-bottom:34px}
.prose h2{font-size:20px; margin:38px 0 10px}
.prose p, .prose li{font-size:14.5px; color:var(--ink2)}
.prose b, .prose strong{color:var(--ink)}
.prose code{font-family:var(--mono); font-size:13px; background:var(--paper2); border:1px solid var(--line);
  border-radius:6px; padding:1px 6px; color:var(--ink)}
.prose ul, .prose ol{padding-left:22px}
.prose li{margin:6px 0}
.callout{background:var(--green-soft); border:1px solid #CDE8DA; border-radius:var(--r-md);
  padding:16px 18px; color:var(--green-ink); font-size:14.5px; font-weight:500; margin:22px 0}