:root {
  --ink: #0a0a0a;
  --paper: #ffffff;
  --g-50: #fafafa;
  --g-100: #f4f4f4;
  --g-200: #ebebeb;
  --g-300: #d6d6d6;
  --g-400: #a3a3a3;
  --g-500: #737373;
  --g-600: #525252;
  --g-700: #3a3a3a;
  --line: #e6e6e6;
  --line-strong: #0a0a0a;
  --maxw: 1140px;
  --maxw-text: 760px;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, system-ui, sans-serif;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--ink); color: #fff; }

a { color: var(--ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--g-500);
  margin: 0;
}
.eyebrow::before { content: ""; width: 30px; height: 1px; background: var(--g-400); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}
.brand {
  display: inline-flex;
  align-items: center;
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: -.01em;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand::before {
  content: "";
  display: inline-block;
  width: 21px;
  height: 21px;
  margin-right: 11px;
  border-radius: 6px;
  background: var(--ink) radial-gradient(circle at center, #fff 0 3px, transparent 3.6px);
  transition: transform .4s var(--ease);
}
.brand:hover::before { transform: rotate(90deg); }
.site-nav { display: flex; gap: 26px; }
.site-nav a {
  position: relative;
  font-family: var(--mono);
  font-size: .8rem;
  letter-spacing: .02em;
  color: var(--g-500);
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -4px;
  width: 100%; height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--ease);
}
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav a:hover::after { transform: scaleX(1); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 116px 0 92px; border-bottom: 1px solid var(--line); }
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(ellipse 75% 65% at 30% 0%, #000 10%, transparent 75%);
  mask-image: radial-gradient(ellipse 75% 65% at 30% 0%, #000 10%, transparent 75%);
  opacity: .6;
  pointer-events: none;
}
.hero .container { position: relative; }
.hero h1 {
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -.04em;
  margin: 26px 0 0;
  font-weight: 800;
}
.hero .sub {
  margin: 28px 0 0;
  font-size: 1.14rem;
  line-height: 1.8;
  color: var(--g-600);
  max-width: 52ch;
}
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 36px; }
.hero-meta span {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--g-600);
  border: 1px solid var(--g-300);
  border-radius: 999px;
  padding: 6px 14px;
}

/* ---------- Sections ---------- */
.section { padding: 92px 0; }
.section-label {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--g-400);
  margin: 0 0 14px;
}
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 40px;
}
.section-head h2 {
  font-size: 1.8rem;
  letter-spacing: -.025em;
  margin: 0; padding: 0; border: 0;
  font-weight: 800;
}
.count { font-family: var(--mono); font-size: .78rem; color: var(--g-400); letter-spacing: .04em; }

/* ---------- Capabilities ---------- */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 2px solid var(--ink);
  border-left: 1px solid var(--line);
}
.capability {
  padding: 32px 28px 40px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.capability .n { font-family: var(--mono); font-size: .76rem; color: var(--g-400); letter-spacing: .06em; }
.capability h3 { font-size: 1.18rem; letter-spacing: -.01em; margin: 18px 0 8px; font-weight: 700; }
.capability p { margin: 0; color: var(--g-600); font-size: .92rem; line-height: 1.75; }

/* ---------- Products (numbered, hover-invert) ---------- */
.product-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.product {
  display: grid;
  grid-template-columns: 34px 50px 1fr auto 24px;
  align-items: center;
  gap: 24px;
  padding: 28px 24px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  transition: background .25s var(--ease), color .25s var(--ease), padding .25s var(--ease);
}
.product:hover { background: var(--ink); color: #fff; text-decoration: none; padding-left: 34px; padding-right: 14px; }
.product-index { font-family: var(--mono); font-size: .82rem; color: var(--g-400); transition: color .25s; }
.product:hover .product-index { color: var(--g-500); }
.product-icon {
  width: 50px; height: 50px;
  display: flex; align-items: center; justify-content: center;
  background: var(--ink); color: #fff;
  border-radius: 13px; font-weight: 700; font-size: 1.3rem;
  transition: background .25s, color .25s;
}
.product:hover .product-icon { background: #fff; color: var(--ink); }
.product-main { min-width: 0; }
.product-name { display: block; font-size: 1.32rem; font-weight: 700; letter-spacing: -.02em; }
.product-desc { display: block; color: var(--g-600); font-size: .92rem; line-height: 1.6; margin-top: 5px; transition: color .25s; }
.product:hover .product-desc { color: var(--g-300); }
.product-tags { display: flex; gap: 8px; }
.product-go { font-family: var(--mono); font-size: 1.25rem; text-align: right; transition: transform .25s var(--ease); }
.product:hover .product-go { transform: translateX(5px); }

/* ---------- Chips / badges ---------- */
.chip {
  font-family: var(--mono);
  font-size: .64rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--g-600);
  border: 1px solid var(--g-300);
  border-radius: 999px;
  padding: 3px 10px;
  white-space: nowrap;
  transition: border-color .25s, color .25s;
}
.product:hover .chip { border-color: var(--g-600); color: #fff; }
.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 3px 11px;
  border-radius: 999px;
  border: 1px solid var(--g-300);
  background: var(--g-50);
  color: var(--g-600);
  vertical-align: middle;
}

/* ---------- Content / legal pages ---------- */
main.container { max-width: var(--maxw-text); padding-top: 60px; padding-bottom: 88px; }

.breadcrumb {
  font-family: var(--mono);
  font-size: .76rem;
  letter-spacing: .02em;
  color: var(--g-500);
  margin-bottom: 30px;
}
.breadcrumb a { color: var(--g-500); }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb span { margin: 0 8px; color: var(--g-300); }

h1 { font-size: 2.1rem; line-height: 1.22; letter-spacing: -.03em; margin: 0 0 10px; font-weight: 800; }
h2 {
  font-size: 1.32rem;
  letter-spacing: -.015em;
  margin: 52px 0 14px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line);
  font-weight: 700;
}
h3 { font-size: 1.04rem; margin: 30px 0 8px; font-weight: 700; }
.lead { font-size: 1.08rem; color: var(--g-600); margin: 0 0 24px; line-height: 1.8; }
.updated { font-family: var(--mono); font-size: .78rem; color: var(--g-500); letter-spacing: .03em; }

.app-head { display: flex; gap: 22px; align-items: center; margin-bottom: 12px; }
.app-head .icon-fallback {
  width: 72px; height: 72px; font-size: 1.8rem;
  display: flex; align-items: center; justify-content: center;
  background: var(--ink); color: #fff; border-radius: 16px; font-weight: 700; flex: 0 0 auto;
}

ul.features, ol.features { padding-left: 1.3em; }
ul.features li, ol.features li { margin: 7px 0; }

.req-table { border-collapse: collapse; width: 100%; margin: 14px 0; }
.req-table th, .req-table td {
  text-align: left; padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  font-size: .94rem; vertical-align: top;
}
.req-table th { width: 210px; color: var(--g-500); font-weight: 600; }
.req-table tr:first-child th, .req-table tr:first-child td { border-top: 1px solid var(--line); }

.doc-links { display: flex; flex-wrap: wrap; gap: 12px; margin: 36px 0 8px; }
.doc-links a {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border: 1px solid var(--line); border-radius: 10px;
  color: var(--ink); font-size: .9rem; font-weight: 600;
  transition: border-color .2s, background .2s, color .2s;
}
.doc-links a:hover { border-color: var(--ink); background: var(--g-50); text-decoration: none; }
.doc-links a:first-child { background: var(--ink); color: #fff; border-color: var(--ink); }
.doc-links a:first-child:hover { background: #000; }

kbd {
  font-family: var(--mono); font-size: .82em;
  background: var(--g-100); border: 1px solid var(--g-200); border-bottom-width: 2px;
  border-radius: 6px; padding: 1px 7px; color: var(--ink);
}
code {
  font-family: var(--mono); font-size: .88em;
  background: var(--g-100); border: 1px solid var(--g-200);
  border-radius: 5px; padding: 1px 6px;
}

.app-subtitle { color: var(--g-600); font-size: 1.06rem; line-height: 1.7; margin: 8px 0 0; }

.figure { margin: 30px 0; }
.figure img {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--line); border-radius: 12px; background: var(--g-100);
}
.figure figcaption {
  font-family: var(--mono); font-size: .76rem; letter-spacing: .02em;
  color: var(--g-500); margin-top: 11px;
}
.shots { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 30px 0; }
.shots .figure { margin: 0; }
@media (max-width: 600px) { .shots { grid-template-columns: 1fr; } }

/* Phone screenshots (portrait) */
.shots-phone { display: flex; flex-wrap: wrap; gap: 18px; margin: 30px 0; }
.shots-phone .figure { margin: 0; flex: 0 1 200px; }
.shots-phone img { border-radius: 16px; }
@media (max-width: 600px) { .shots-phone .figure { flex: 0 1 46%; } }

.faq dt { font-weight: 700; margin-top: 24px; font-size: 1rem; }
.faq dd { margin: 6px 0 0; color: var(--g-600); }

.note {
  background: var(--g-50); border: 1px solid var(--line); border-left: 3px solid var(--ink);
  border-radius: 8px; padding: 15px 18px; margin: 22px 0; font-size: .93rem; line-height: 1.75;
}
.note-strong {
  background: var(--ink); border: 1px solid var(--ink); color: #fff;
  border-radius: 8px; padding: 15px 18px; margin: 22px 0; font-size: .92rem; line-height: 1.75;
}

/* ---------- Footer (black band) ---------- */
.site-footer { background: var(--ink); color: #fff; margin-top: 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  padding: 72px 28px 48px;
}
.site-footer .brand { color: #fff; font-size: 1.4rem; }
.site-footer .brand::before {
  background: #fff radial-gradient(circle at center, var(--ink) 0 3px, transparent 3.6px);
}
.footer-brand p { color: var(--g-400); font-size: .92rem; margin: 16px 0 0; max-width: 36ch; }
.footer-nav { display: flex; flex-direction: column; gap: 12px; }
.footer-label {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--g-600); margin-bottom: 4px;
}
.footer-nav a { color: var(--g-300); font-size: .92rem; width: fit-content; }
.footer-nav a:hover { color: #fff; }
.footer-base {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  padding: 22px 28px;
  border-top: 1px solid var(--g-700);
}
.footer-base span {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .04em; color: var(--g-500);
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .hero { padding: 80px 0 60px; }
  .section { padding: 60px 0; }
  .capability-grid { grid-template-columns: 1fr; }
  .product { grid-template-columns: 28px 44px 1fr; gap: 16px; }
  .product-tags, .product-go { display: none; }
  .product:hover { padding-left: 24px; padding-right: 24px; }
  .product-name { font-size: 1.15rem; }
  h1 { font-size: 1.65rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; padding: 52px 28px 40px; }
  .site-nav { gap: 18px; }
}