/* ============================================================
   Kōtō 鼓刀 — single-smith bladesmith
   Extreme minimalism + metal. Graphite ground, brushed steel,
   one deep-indigo accent. Vast negative space, one honed edge.
   ============================================================ */

:root{
  --void:      #0d0e10;
  --graphite:  #131519;
  --panel:     #191c21;
  --panel-2:   #20242a;
  --ink:       #e9ecf1;
  --ink-soft:  #aab2bd;
  --muted:     #6d757f;
  --steel:     #cdd3da;   /* brushed-steel highlight */
  --steel-lo:  #868d97;
  --indigo:    #4b45c9;   /* deep indigo accent */
  --indigo-hi: #7d76f0;   /* glint */
  --indigo-dim:rgba(75,69,201,.16);
  --line:      rgba(233,236,241,.10);
  --line-soft: rgba(233,236,241,.055);

  --serif: "Prata", Georgia, "Times New Roman", serif;
  --sans:  "Schibsted Grotesk", system-ui, -apple-system, sans-serif;
  --mono:  "Fragment Mono", ui-monospace, "SFMono-Regular", monospace;

  --maxw: 1200px;
  --gut: clamp(1.15rem, 4vw, 3.2rem);
  --ease: cubic-bezier(.22,.61,.36,1);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
@media (prefers-reduced-motion: reduce){ html{ scroll-behavior:auto; } }

body{
  margin:0;
  background:
    radial-gradient(130% 90% at 78% -12%, rgba(75,69,201,.12), transparent 52%),
    radial-gradient(80% 60% at 8% 4%, rgba(205,211,218,.05), transparent 60%),
    var(--void);
  color:var(--ink);
  font-family:var(--sans);
  font-size:clamp(15px, .5vw + 13.4px, 17px);
  line-height:1.66;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

img,svg,canvas{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }

::selection{ background:var(--indigo); color:#f2f1ff; }
:focus-visible{ outline:2px solid var(--indigo-hi); outline-offset:3px; border-radius:2px; }

.skip{
  position:absolute; left:12px; top:-52px; z-index:80;
  background:var(--steel); color:#14161a; padding:.55rem 1rem;
  border-radius:4px; font-weight:600; transition:top .18s var(--ease);
}
.skip:focus{ top:12px; }

/* ============ shared type helpers ============ */
.eyebrow, .section-kicker{
  font-family:var(--mono);
  font-size:.7rem; letter-spacing:.34em; text-transform:uppercase;
  color:var(--steel-lo); margin:0; display:inline-flex; align-items:center; gap:.75rem;
}
.section-kicker .rule{
  width:clamp(20px,5vw,42px); height:1px; background:linear-gradient(90deg,var(--indigo-hi),transparent);
  display:inline-block;
}
.section-title{
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(2.7rem, 8.5vw, 5.4rem);
  line-height:.96; letter-spacing:-.012em;
  margin:.55rem 0 1rem;
}
.section-lede{
  color:var(--ink-soft);
  font-size:clamp(1.02rem,1.2vw + .7rem,1.24rem);
  line-height:1.6; max-width:44ch; margin:0;
}
.section-head{ max-width:var(--maxw); margin:0 auto; padding:0 var(--gut); }
.section-head--wide .section-lede{ max-width:52ch; }

/* ============ buttons ============ */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  font-family:var(--sans); font-weight:600; font-size:.94rem;
  letter-spacing:.01em; padding:.82rem 1.5rem; border-radius:2px;
  border:1px solid transparent; cursor:pointer;
  transition:transform .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.btn--steel{
  background:linear-gradient(180deg,#eef1f5,var(--steel));
  color:#14161a; border-color:#e6eaef;
  box-shadow:0 1px 0 rgba(255,255,255,.35) inset, 0 10px 30px -14px rgba(0,0,0,.8);
}
.btn--steel:hover{ transform:translateY(-2px); }
.btn--ghost{
  background:transparent; color:var(--ink);
  border-color:var(--line); backdrop-filter:blur(4px);
}
.btn--ghost:hover{ border-color:var(--indigo-hi); color:#fff; transform:translateY(-2px); }

/* ============ nav ============ */
.nav{
  position:fixed; inset:0 0 auto 0; z-index:60;
  display:flex; align-items:center; gap:1rem;
  padding:.85rem var(--gut);
  background:linear-gradient(180deg, rgba(13,14,16,.82), rgba(13,14,16,.28) 70%, transparent);
  backdrop-filter:blur(9px) saturate(120%);
  -webkit-backdrop-filter:blur(9px) saturate(120%);
}
.brand{ display:inline-flex; align-items:center; gap:.6rem; margin-right:auto; color:var(--steel); }
.brand__mark{ display:inline-flex; color:var(--steel); }
.brand__word{ font-family:var(--serif); font-size:1.34rem; letter-spacing:.01em; color:var(--ink); line-height:1; }
.brand__kanji{ font-family:var(--serif); font-size:.9rem; margin-left:.4rem; color:var(--steel-lo); vertical-align:.08em; }
.nav__links{ display:flex; gap:1.4rem; }
.nav__links a{
  font-size:.9rem; color:var(--ink-soft); position:relative; padding:.25rem 0;
  transition:color .18s var(--ease);
}
.nav__links a::after{
  content:""; position:absolute; left:0; bottom:-1px; height:1px; width:0;
  background:var(--indigo-hi); transition:width .24s var(--ease);
}
.nav__links a:hover{ color:var(--ink); }
.nav__links a:hover::after{ width:100%; }
.nav__cta{
  font-family:var(--mono); font-size:.72rem; letter-spacing:.18em; text-transform:uppercase;
  color:var(--ink); border:1px solid var(--line); padding:.5rem .9rem; border-radius:2px;
  transition:border-color .2s var(--ease), background .2s var(--ease);
}
.nav__cta:hover{ border-color:var(--indigo-hi); background:var(--indigo-dim); }

@media (max-width: 780px){
  .nav__links{ display:none; }
}

/* ============ HERO ============ */
.hero{
  position:relative; min-height:100svh;
  display:flex; flex-direction:column; justify-content:center;
  padding:7rem var(--gut) 4.5rem;
  overflow:hidden;
}
.hero__canvas{
  position:absolute; inset:0; width:100%; height:100%;
  z-index:0;
}
.hero__veil{
  position:absolute; inset:0; z-index:1; pointer-events:none;
  background:
    linear-gradient(90deg, rgba(13,14,16,.92) 0%, rgba(13,14,16,.55) 34%, rgba(13,14,16,0) 62%),
    linear-gradient(0deg, rgba(13,14,16,.7) 0%, transparent 30%, transparent 72%, rgba(13,14,16,.5) 100%);
}
.hero__wrap{
  position:relative; z-index:2; max-width:var(--maxw); width:100%;
  margin:0 auto;
}
.hero__title{
  font-family:var(--serif); font-weight:400;
  font-size:clamp(4.4rem, 18vw, 12rem);
  line-height:.9; letter-spacing:-.02em; margin:.6rem 0 1.1rem;
  color:#fff;
  text-shadow:0 2px 40px rgba(0,0,0,.5);
}
.hero__kanji{
  font-size:.26em; letter-spacing:.1em; color:var(--steel);
  margin-left:.5em; vertical-align:.6em; opacity:.9;
}
.hero__lede{
  color:var(--ink-soft); max-width:40ch;
  font-size:clamp(1.05rem,1.4vw + .7rem,1.34rem); line-height:1.58; margin:0 0 1.9rem;
}
.hero__actions{ display:flex; flex-wrap:wrap; gap:.8rem; }

.hero__cap{
  position:absolute; z-index:2; right:var(--gut); bottom:2.4rem;
  display:flex; flex-direction:column; gap:.5rem; align-items:flex-end;
  font-family:var(--mono); font-size:.72rem; letter-spacing:.12em;
  color:var(--ink-soft);
}
.hero__caprow{ display:inline-flex; align-items:center; gap:.55rem; }
.dot{ width:7px; height:7px; border-radius:50%; display:inline-block; }
.dot--spine{ background:var(--steel-lo); }
.dot--hamon{ background:var(--indigo-hi); box-shadow:0 0 8px var(--indigo-hi); }
.dot--edge{ background:#eef2f7; box-shadow:0 0 8px rgba(238,242,247,.6); }

.hero__hint{
  position:absolute; z-index:2; left:var(--gut); bottom:2.4rem;
  font-family:var(--mono); font-size:.7rem; letter-spacing:.2em; text-transform:uppercase;
  color:var(--steel-lo); margin:0;
  opacity:0; transition:opacity 1s var(--ease) .8s;
}
.hero__hint.show{ opacity:.85; }
.hero__hint::before{ content:"↔ "; color:var(--indigo-hi); }

.hero__scroll{
  position:absolute; z-index:2; left:50%; bottom:1.6rem; transform:translateX(-50%);
  width:26px; height:42px; border:1px solid var(--line); border-radius:14px;
  display:grid; place-items:start center; padding-top:7px;
}
.hero__scroll span{
  width:3px; height:8px; border-radius:2px; background:var(--steel);
  animation:scrolldrop 1.8s var(--ease) infinite;
}
@keyframes scrolldrop{ 0%{ transform:translateY(0); opacity:0; } 30%{ opacity:1; } 70%{ transform:translateY(14px); opacity:0; } 100%{ opacity:0; } }
@media (max-width:780px){ .hero__cap{ display:none; } .hero__scroll{ display:none; } }

/* ============ section rhythm ============ */
section{ position:relative; }
.steel, .range, .maker, .care, .commission{
  padding:clamp(4.5rem, 11vw, 9rem) 0;
}
.section-head{ margin-bottom:clamp(2.4rem,5vw,4rem); }

/* ============ THE STEEL ============ */
.steel{ border-top:1px solid var(--line-soft); }
.fold{
  max-width:var(--maxw); margin:0 auto; padding:0 var(--gut);
  display:grid; grid-template-columns:minmax(200px, .8fr) 1.2fr; gap:clamp(2rem,5vw,5rem);
  align-items:center;
}
.fold__stack{
  list-style:none; margin:0; padding:0;
  display:flex; flex-direction:column; gap:2px;
  height:clamp(240px,42vh,360px); justify-content:center;
}
.fold__stack li{
  height:6px; border-radius:1px;
  background:linear-gradient(90deg, var(--steel-lo), var(--steel) 45%, #f2f5f8 50%, var(--steel-lo) 55%, var(--panel));
  background-size:220% 100%;
  transform:scaleX(var(--sx,1)); transform-origin:left;
  opacity:var(--op,1);
  animation:sheen 6s linear infinite;
  animation-delay:calc(var(--i) * -140ms);
}
@keyframes sheen{ 0%{ background-position:120% 0; } 100%{ background-position:-120% 0; } }
.fold__read{ min-width:0; }
.fold__stat{ display:inline-flex; align-items:baseline; gap:.6rem; margin-right:2rem; }
.fold__num{
  font-family:var(--serif); font-size:clamp(2.4rem,6vw,3.6rem); line-height:1;
  color:var(--ink); letter-spacing:-.01em;
}
.fold__label{ font-family:var(--mono); font-size:.72rem; letter-spacing:.16em; text-transform:uppercase; color:var(--steel-lo); }
.fold__note{ color:var(--ink-soft); margin:1.4rem 0 1.6rem; max-width:50ch; }
.fold__facts{ list-style:none; margin:0; padding:0; border-top:1px solid var(--line); }
.fold__facts li{
  display:grid; grid-template-columns:6.5rem 1fr; gap:1rem;
  padding:.85rem 0; border-bottom:1px solid var(--line-soft);
  color:var(--ink-soft); font-size:.95rem;
}
.fold__facts li span{ font-family:var(--mono); font-size:.72rem; letter-spacing:.12em; text-transform:uppercase; color:var(--indigo-hi); align-self:center; }
.fold__facts li em{ font-style:italic; color:var(--ink); font-family:var(--serif); }

@media (max-width:720px){
  .fold{ grid-template-columns:1fr; gap:2.2rem; }
  .fold__stack{ height:150px; }
  .fold__stat{ margin-right:1.4rem; }
}

/* ============ THE RANGE ============ */
.knives{ list-style:none; margin:0 auto; padding:0 var(--gut); max-width:var(--maxw); }
.knife{
  display:grid; grid-template-columns:1.05fr 1fr; gap:clamp(1.6rem,4vw,4rem);
  align-items:center;
  padding:clamp(2.2rem,4.5vw,3.6rem) 0;
  border-top:1px solid var(--line);
}
.knife:last-child{ border-bottom:1px solid var(--line); }
.knife--flip .knife__art{ order:2; }
.knife--flip .knife__body{ order:1; }
.knife--feature{ grid-template-columns:1fr; text-align:left; }
.knife--feature .knife__art{ margin-bottom:1rem; }

.knife__art{
  position:relative;
  background:
    radial-gradient(120% 140% at 30% 0%, rgba(75,69,201,.09), transparent 60%),
    linear-gradient(180deg, var(--panel), var(--graphite));
  border:1px solid var(--line); border-radius:4px;
  padding:clamp(1.4rem,4vw,2.6rem);
  overflow:hidden;
}
.knife__art::after{
  content:""; position:absolute; inset:0; pointer-events:none;
  background:linear-gradient(115deg, transparent 42%, rgba(255,255,255,.06) 50%, transparent 58%);
}
.knife--feature .knife__svg{ max-width:640px; margin:0 auto; }
.knife__svg{ width:100%; height:auto; overflow:visible; }
.k-blade{ fill:#c3cad3; }
.k-edge{ fill:none; stroke:#f4f7fa; stroke-width:1.4; }
.k-hamon{ fill:none; stroke:var(--indigo-hi); stroke-width:1.4; stroke-dasharray:2 5; opacity:.85; }
.k-tang{ fill:#2a2620; stroke:#3a352c; stroke-width:1; }

.knife__jp{ font-family:var(--serif); font-size:1.5rem; color:var(--steel-lo); margin:0 0 .3rem; letter-spacing:.1em; }
.knife__name{
  font-family:var(--serif); font-weight:400; font-size:clamp(2rem,4.5vw,3rem);
  line-height:1; margin:0 0 .8rem; color:var(--ink); letter-spacing:-.01em;
}
.knife__name span{ font-family:var(--mono); font-size:.4em; color:var(--indigo-hi); vertical-align:.5em; letter-spacing:.06em; }
.knife__blurb{ color:var(--ink-soft); margin:0 0 1.5rem; max-width:46ch; }
.spec{ margin:0 0 1.4rem; border-top:1px solid var(--line-soft); }
.spec > div{
  display:grid; grid-template-columns:7.5rem 1fr; gap:1rem; align-items:baseline;
  padding:.7rem 0; border-bottom:1px solid var(--line-soft);
}
.spec dt{ font-family:var(--mono); font-size:.7rem; letter-spacing:.14em; text-transform:uppercase; color:var(--steel-lo); }
.spec dd{ margin:0; color:var(--ink); font-size:.98rem; }
.knife__price{ font-family:var(--mono); font-size:.8rem; letter-spacing:.06em; color:var(--indigo-hi); margin:0; }

@media (max-width:760px){
  .knife{ grid-template-columns:1fr; gap:1.5rem; }
  .knife--flip .knife__art{ order:0; }
  .knife--flip .knife__body{ order:0; }
  .spec > div{ grid-template-columns:6.5rem 1fr; }
}

/* ============ THE MAKER ============ */
.maker{ border-top:1px solid var(--line-soft); background:linear-gradient(180deg, transparent, rgba(75,69,201,.045)); }
.maker__wrap{
  max-width:var(--maxw); margin:0 auto; padding:0 var(--gut);
  display:grid; grid-template-columns:auto 1fr; gap:clamp(2rem,5vw,4.5rem); align-items:start;
}
.maker__seal{ width:clamp(88px,14vw,132px); flex:none; }
.seal-box{ fill:none; stroke:var(--indigo); stroke-width:2; }
.seal-kanji{ fill:var(--steel); font-family:var(--serif); font-size:40px; }
.maker__quote{ margin:0 0 1.6rem; padding:0; border-left:2px solid var(--indigo); padding-left:1.4rem; }
.maker__quote p{
  font-family:var(--serif); font-size:clamp(1.4rem,3vw,2.1rem); line-height:1.3;
  color:var(--ink); margin:0; font-style:normal;
}
.maker__text{ color:var(--ink-soft); margin:0 0 1.1rem; max-width:56ch; }
.maker__sign{ font-family:var(--mono); font-size:.82rem; color:var(--steel-lo); margin:1.4rem 0 0; letter-spacing:.06em; }
.maker__sign span{ font-family:var(--serif); font-size:1.3rem; color:var(--ink); letter-spacing:.01em; }
@media (max-width:640px){ .maker__wrap{ grid-template-columns:1fr; } }

/* ============ CARE ============ */
.care{ border-top:1px solid var(--line-soft); }
.care__grid{
  max-width:var(--maxw); margin:0 auto; padding:0 var(--gut);
  display:grid; grid-template-columns:1.15fr .85fr; gap:clamp(2rem,5vw,4.5rem); align-items:start;
}
.steps{ list-style:none; margin:0; padding:0; }
.step{ display:grid; grid-template-columns:auto 1fr; gap:1.2rem; padding:1.2rem 0; border-bottom:1px solid var(--line-soft); }
.step:first-child{ padding-top:0; }
.step__no{ font-family:var(--mono); font-size:.82rem; color:var(--indigo-hi); letter-spacing:.1em; padding-top:.35rem; }
.step__title{ font-family:var(--serif); font-weight:400; font-size:1.4rem; margin:0 0 .35rem; color:var(--ink); }
.step__text{ color:var(--ink-soft); margin:0; font-size:.98rem; }

.angle{
  position:sticky; top:5.5rem;
  background:linear-gradient(180deg, var(--panel), var(--graphite));
  border:1px solid var(--line); border-radius:4px; padding:clamp(1.4rem,3.5vw,2rem);
}
.angle__svg{ width:100%; height:auto; margin-bottom:1rem; }
.a-stone{ stroke:var(--steel-lo); stroke-width:2; }
.a-hatch line{ stroke:var(--line); stroke-width:1; }
.a-knife{ fill:#c3cad3; stroke:#eef2f7; stroke-width:1; }
.a-arc{ fill:none; stroke:var(--indigo-hi); stroke-width:1.4; }
.a-deg{ fill:var(--indigo-hi); font-family:var(--mono); font-size:15px; }
.a-base{ stroke:var(--steel-lo); stroke-width:1; stroke-dasharray:3 3; }
.angle__cap{ color:var(--ink-soft); font-size:.9rem; margin:0 0 1.2rem; }
.angle__grits{ margin:0; border-top:1px solid var(--line); }
.angle__grits > div{ display:grid; grid-template-columns:5.5rem 1fr; gap:1rem; padding:.6rem 0; border-bottom:1px solid var(--line-soft); }
.angle__grits dt{ font-family:var(--mono); font-size:.7rem; letter-spacing:.12em; text-transform:uppercase; color:var(--steel-lo); }
.angle__grits dd{ margin:0; color:var(--ink-soft); font-size:.9rem; }

.care__warn{
  max-width:var(--maxw); margin:clamp(2rem,5vw,3.5rem) auto 0; padding:0 var(--gut);
  color:var(--ink-soft); font-size:.95rem; max-width:60ch;
}
.care__warn span{ color:var(--indigo-hi); font-weight:700; margin-right:.4rem; }
@media (max-width:760px){ .care__grid{ grid-template-columns:1fr; } .angle{ position:static; } }

/* ============ COMMISSION ============ */
.commission{ border-top:1px solid var(--line-soft); background:linear-gradient(180deg, rgba(75,69,201,.05), transparent); }
.commission__wrap{
  max-width:var(--maxw); margin:0 auto; padding:0 var(--gut);
  display:grid; grid-template-columns:1fr 1fr; gap:clamp(2rem,5vw,4.5rem); align-items:start;
}
.commission__meta{ margin:2rem 0 0; border-top:1px solid var(--line); }
.commission__meta > div{ display:grid; grid-template-columns:9rem 1fr; gap:1rem; padding:.75rem 0; border-bottom:1px solid var(--line-soft); }
.commission__meta dt{ font-family:var(--mono); font-size:.7rem; letter-spacing:.14em; text-transform:uppercase; color:var(--steel-lo); }
.commission__meta dd{ margin:0; color:var(--ink); font-size:.96rem; }

.commission__form{
  background:linear-gradient(180deg, var(--panel), var(--graphite));
  border:1px solid var(--line); border-radius:4px; padding:clamp(1.5rem,4vw,2.4rem);
}
.commission__formlede{ color:var(--ink-soft); margin:0 0 1.5rem; font-size:.95rem; }
.field{ margin-bottom:1.2rem; }
.field label{ display:block; font-family:var(--mono); font-size:.68rem; letter-spacing:.16em; text-transform:uppercase; color:var(--steel-lo); margin-bottom:.5rem; }
.field input, .field textarea, .select select{
  width:100%; font-family:var(--sans); font-size:1rem; color:var(--ink);
  background:var(--void); border:1px solid var(--line); border-radius:3px;
  padding:.75rem .9rem; transition:border-color .18s var(--ease), background .18s var(--ease);
}
.field input:focus, .field textarea:focus, .select select:focus{ outline:none; border-color:var(--indigo-hi); background:#101116; }
.field textarea{ resize:vertical; min-height:110px; }
.field input::placeholder, .field textarea::placeholder{ color:var(--muted); }
.select{ position:relative; }
.select::after{ content:"▾"; position:absolute; right:1rem; top:50%; transform:translateY(-50%); color:var(--steel-lo); pointer-events:none; font-size:.8rem; }
.select select{ appearance:none; -webkit-appearance:none; cursor:pointer; padding-right:2.4rem; }
.commission__status{ font-family:var(--mono); font-size:.82rem; color:var(--indigo-hi); margin:1rem 0 0; min-height:1.2em; }
@media (max-width:760px){ .commission__wrap{ grid-template-columns:1fr; } }

/* ============ FOOTER ============ */
.foot{ border-top:1px solid var(--line); padding:clamp(2.5rem,6vw,4rem) 0 3rem; }
.foot__wrap{ max-width:var(--maxw); margin:0 auto; padding:0 var(--gut); display:flex; flex-wrap:wrap; gap:1.4rem 2rem; align-items:center; }
.foot__brand{ display:inline-flex; align-items:center; gap:.6rem; color:var(--steel); font-family:var(--serif); font-size:1.05rem; }
.foot__mark{ color:var(--steel); display:inline-flex; }
.foot__nav{ display:flex; flex-wrap:wrap; gap:1.2rem; margin-left:auto; }
.foot__nav a{ font-size:.86rem; color:var(--ink-soft); transition:color .18s var(--ease); }
.foot__nav a:hover{ color:var(--ink); }
.foot__fine{ flex-basis:100%; color:var(--muted); font-size:.8rem; font-family:var(--mono); letter-spacing:.03em; margin:.6rem 0 0; max-width:70ch; }

/* ============ reduced motion ============ */
@media (prefers-reduced-motion: reduce){
  .fold__stack li{ animation:none; }
  .hero__scroll span{ animation:none; opacity:.6; }
  .knife__art::after{ display:none; }
}