/* ============================================================
   brainux for SHARP Brain — Release Site Stylesheet
   ============================================================ */
:root {
  --bg: #f5f7fb;
  --bg-soft: #eef1f7;
  --surface: #ffffff;
  --text: #1c2434;
  --text-soft: #5a6478;
  --border: #dfe4ee;
  --primary: #0e7490;
  --primary-dark: #155e75;
  --accent: #22d3ee;
  --accent-strong: #06b6d4;
  --hero-bg: #0b1220;
  --hero-text: #e6edf7;
  --code-bg: #101826;
  --code-text: #d7e3f4;
  --success: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 8px 24px rgba(16, 24, 40, .06);
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    "Yu Gothic UI", "Meiryo", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
}

/* ---------- header / nav ---------- */
.site-header {
  background: var(--hero-bg);
  color: var(--hero-text);
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  color: var(--hero-text);
  white-space: nowrap;
}
.brand .logo {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: block;
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
}
.nav-links a {
  color: #b9c6da;
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 14px;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.nav-links a:hover { background: rgba(255, 255, 255, .08); color: #fff; }
.nav-links a.active { background: rgba(34, 211, 238, .14); color: var(--accent); }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,.2);
  color: var(--hero-text);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 16px;
  cursor: pointer;
}

/* ---------- hero ---------- */
.hero {
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(34, 211, 238, .18), transparent 60%),
    radial-gradient(700px 380px at 8% 110%, rgba(14, 116, 144, .35), transparent 60%),
    var(--hero-bg);
  color: var(--hero-text);
  padding: 72px 20px 64px;
}
.hero-inner { max-width: var(--maxw); margin: 0 auto; }
.hero h1 {
  font-size: clamp(28px, 4.5vw, 44px);
  margin: 0 0 8px;
  letter-spacing: .01em;
  line-height: 1.25;
}
.hero .subtitle {
  font-size: clamp(15px, 2vw, 18px);
  color: #a7b7cf;
  margin: 8px 0 20px;
}
.hero .badge-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 22px; }
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(34, 211, 238, .12);
  border: 1px solid rgba(34, 211, 238, .35);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  font-family: "Cascadia Mono", Consolas, monospace;
}
.hero .lead { max-width: 720px; color: #c7d3e4; font-size: 16px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  padding: 10px 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: transform .1s, box-shadow .15s, background .15s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent-strong), #0ea5e9);
  color: #052029;
  box-shadow: 0 4px 14px rgba(6, 182, 212, .35);
}
.btn-primary:hover { box-shadow: 0 6px 20px rgba(6, 182, 212, .45); }
.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, .25);
  color: var(--hero-text);
}
.btn-ghost:hover { background: rgba(255, 255, 255, .07); }
.btn-dark {
  background: var(--hero-bg);
  color: var(--hero-text);
  border-color: var(--border);
}
.btn-dark:hover { background: #131c2e; }

/* ---------- layout ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 40px 20px 64px; }
.page-header { margin-bottom: 28px; }
.page-header h1 { margin: 0 0 6px; font-size: 30px; }
.page-header .crumbs { color: var(--text-soft); font-size: 13px; margin-bottom: 4px; }
.page-header p { color: var(--text-soft); margin: 0; max-width: 760px; }

section.block { margin: 0 0 40px; }
h2.sec {
  font-size: 22px;
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}
h2.sec .ic { color: var(--primary); }
h3.sub { font-size: 17px; margin: 26px 0 8px; color: var(--primary-dark); }
p { margin: 8px 0; }
a { color: var(--primary); }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }

/* ---------- cards / grids ---------- */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; font-size: 16px; }
.card p { color: var(--text-soft); font-size: 14px; margin: 0; }
.card .big { font-size: 26px; font-weight: 700; color: var(--primary-dark); }

/* ---------- download panel ---------- */
.dl-panel {
  background: linear-gradient(180deg, #0e1a2e, #0b1220);
  color: var(--hero-text);
  border-radius: 16px;
  padding: 28px;
  border: 1px solid rgba(34, 211, 238, .25);
  box-shadow: var(--shadow);
}
.dl-panel h2 { margin: 0 0 4px; font-size: 22px; }
.dl-panel .meta { color: #9fb0c9; font-size: 14px; }
.dl-table { width: 100%; border-collapse: collapse; margin: 18px 0 8px; }
.dl-table th, .dl-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, .09);
  font-size: 14px;
  vertical-align: middle;
}
.dl-table th { color: #93a5c0; font-weight: 600; font-size: 13px; }
.dl-table td .fn { font-family: "Cascadia Mono", Consolas, monospace; font-size: 13px; color: var(--accent); }
.hash {
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 12px;
  color: #c9d6ea;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 6px;
  padding: 4px 8px;
  word-break: break-all;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.copy-btn {
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  color: var(--hero-text);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
}
.copy-btn:hover { background: rgba(255,255,255,.18); }

/* ---------- code ---------- */
pre {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 10px;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.7;
  position: relative;
  border: 1px solid #1f2a3d;
}
code {
  font-family: "Cascadia Mono", Consolas, "Courier New", monospace;
  background: rgba(14, 116, 144, .08);
  color: var(--primary-dark);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: .92em;
}
pre code { background: none; color: inherit; padding: 0; font-size: inherit; }
pre .cmd { color: #ffd479; user-select: none; }
pre .cmt { color: #6b7d99; }

/* ---------- tables ---------- */
table.tbl { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14px; background: var(--surface); border-radius: 10px; overflow: hidden; box-shadow: var(--shadow); }
.tbl th { background: var(--bg-soft); text-align: left; padding: 10px 12px; border-bottom: 2px solid var(--border); }
.tbl td { padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.tbl tr:last-child td { border-bottom: none; }

/* ---------- callouts ---------- */
.note {
  border-radius: 10px;
  padding: 12px 16px;
  margin: 14px 0;
  font-size: 14px;
  border: 1px solid;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.note .ic { font-size: 16px; line-height: 1.5; }
.note-info { background: #eaf6fb; border-color: #a5d8ec; color: #0c4a5e; }
.note-warn { background: #fdf3e3; border-color: #f0d5a0; color: #7c4a03; }
.note-ok { background: #eaf7ef; border-color: #b6e3c8; color: #14532d; }
.note-err { background: #fdecec; border-color: #f3b6b6; color: #7f1d1d; }

/* ---------- steps ---------- */
.steps { counter-reset: step; list-style: none; padding: 0; margin: 12px 0; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: 14px 16px 14px 56px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 10px 0;
  font-size: 14.5px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-strong), #0ea5e9);
  color: #052029;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}
.steps li b { display: block; font-size: 15px; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--hero-bg);
  color: #8fa0ba;
  padding: 28px 20px;
  font-size: 13px;
}
.site-footer .inner { max-width: var(--maxw); margin: 0 auto; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer a { color: var(--accent); text-decoration: none; }
.site-footer .mono { font-family: "Cascadia Mono", Consolas, monospace; font-size: 12px; }

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  .nav-toggle { display: inline-block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #0e1626;
    flex-direction: column;
    align-items: stretch;
    padding: 10px 16px 16px;
    gap: 2px;
    border-bottom: 1px solid rgba(255,255,255,.1);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 12px; }
  .hero { padding: 48px 20px 44px; }
  .container { padding: 28px 16px 48px; }
  .dl-panel { padding: 20px 16px; }
  .hero-inner { grid-template-columns: 1fr; gap: 26px; }
  .hand-split { grid-template-columns: 1fr; }
}

/* ---------- hero layout (text + photo) ---------- */
.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 44px;
  align-items: center;
}
.hero-photo img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, .14);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .5);
}
.hero-photo .cap {
  margin: 10px 2px 0;
  color: #8fa0ba;
  font-size: 12.5px;
}

/* ---------- 左手/右手 コンセプト ---------- */
.hand-split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 18px 0; }
.hand-card {
  border-radius: 14px;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.hand-card .em { font-size: 34px; line-height: 1; }
.hand-card b { font-size: 16px; display: block; }
.hand-card p { margin: 2px 0 0; color: var(--text-soft); font-size: 13.5px; }
.hand-card.right { background: linear-gradient(135deg, #eef4ff, #e6f0fd); border-color: #c9dcf7; }
.hand-card.left { background: linear-gradient(135deg, #e7fafd, #dcf6fb); border-color: #b3e6f0; }