:root {
  --abyss: #020814;
  --deep: #061a33;
  --mid: #0b3a5c;
  --shallow: #1c6f8f;
  --glow: #9fe8ff;
  --pearl: #f3f8ff;
  --ink: #e9f3ff;
  --ink-dim: #a8bfd6;
  --ink-faint: #6d86a1;
  --gold: #f3d48b;
  --coral: #ff9a8b;
  --glass: rgba(170, 220, 255, 0.07);
  --glass-strong: rgba(170, 220, 255, 0.12);
  --line: rgba(190, 230, 255, 0.16);
  --danger: #ff8f8f;
  --radius: 22px;
  --serif: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --sans: "Zen Kaku Gothic New", "Hiragino Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: radial-gradient(120% 80% at 50% -10%, #12507a 0%, var(--deep) 38%, var(--abyss) 100%) fixed;
  background-color: var(--abyss);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.85;
  letter-spacing: 0.02em;
  min-height: 100vh;
  overflow-x: hidden;
}
#sea { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }
.page { position: relative; z-index: 1; max-width: 880px; margin: 0 auto; padding: 0 16px 96px; }

a { color: var(--glow); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 4px; }

header.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 22px 0; position: relative; z-index: 2;
}
.brand { font-family: var(--serif); font-size: 20px; letter-spacing: 0.18em; color: var(--pearl); display: flex; align-items: center; gap: 10px; }
.brand:hover { text-decoration: none; }
.brand .mark { width: 28px; height: 28px; border-radius: 50%; background: radial-gradient(circle at 35% 30%, #fff 0%, var(--glow) 30%, rgba(159,232,255,0) 72%); box-shadow: 0 0 24px rgba(159,232,255,.6); }
nav.links { display: flex; gap: 18px; font-size: 14px; flex-wrap: wrap; justify-content: flex-end; }
nav.links a { color: var(--ink-dim); }
nav.links a:hover { color: var(--pearl); }

.hero { text-align: center; padding: 15vh 0 10vh; }
.hero .eyebrow { font-size: 13px; letter-spacing: .4em; color: var(--glow); opacity: .85; }
.hero h1 { font-family: var(--serif); font-weight: 500; font-size: clamp(34px, 7vw, 64px); line-height: 1.35; margin: 18px 0 22px; letter-spacing: .08em; text-shadow: 0 0 40px rgba(159,232,255,.35); }
.hero p { color: var(--ink-dim); max-width: 34em; margin: 0 auto; }

h2 { font-family: var(--serif); font-weight: 500; font-size: 26px; letter-spacing: .1em; margin: 64px 0 18px; }
h3 { font-family: var(--serif); font-weight: 500; font-size: 19px; margin: 28px 0 8px; letter-spacing: .06em; }
.lead { color: var(--ink-dim); }
.muted { color: var(--ink-faint); font-size: 13px; }

.glass {
  background: linear-gradient(160deg, var(--glass-strong), var(--glass));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  padding: 26px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255,255,255,.08);
}
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.steps .glass h3 { margin-top: 4px; }
.steps .num { font-family: var(--serif); color: var(--gold); font-size: 13px; letter-spacing: .3em; }

.plan { display: flex; flex-direction: column; gap: 10px; position: relative; }
.plan .price { font-family: var(--serif); font-size: 34px; color: var(--pearl); }
.plan .price small { font-size: 14px; color: var(--ink-dim); margin-left: 4px; }
.plan.featured { border-color: rgba(243, 212, 139, .5); box-shadow: 0 0 0 1px rgba(243,212,139,.25), 0 30px 80px rgba(0,0,0,.35); }
.plan .badge { position: absolute; top: -12px; right: 18px; background: var(--gold); color: #2b2210; font-size: 12px; padding: 2px 12px; border-radius: 999px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; border: 1px solid rgba(159,232,255,.55);
  background: linear-gradient(180deg, rgba(159,232,255,.22), rgba(159,232,255,.06));
  color: var(--pearl); font: inherit; font-size: 15px; letter-spacing: .08em; cursor: pointer;
  box-shadow: 0 0 30px rgba(159,232,255,.18); transition: transform .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 0 44px rgba(159,232,255,.35); text-decoration: none; }
.btn.gold { border-color: rgba(243,212,139,.7); background: linear-gradient(180deg, rgba(243,212,139,.28), rgba(243,212,139,.06)); box-shadow: 0 0 30px rgba(243,212,139,.18); }
.btn.ghost { background: transparent; box-shadow: none; }
.btn.danger { border-color: rgba(255,143,143,.6); background: rgba(255,143,143,.12); }
.btn.small { padding: 6px 14px; font-size: 13px; }

form.stack { display: flex; flex-direction: column; gap: 16px; }
label { font-size: 14px; color: var(--ink-dim); display: flex; flex-direction: column; gap: 6px; }
input[type=text], input[type=email], input[type=url], input[type=password], textarea, select {
  width: 100%; padding: 12px 14px; border-radius: 14px; border: 1px solid var(--line);
  background: rgba(2, 12, 26, .55); color: var(--ink); font: inherit; font-size: 15px;
}
input:focus, textarea:focus, select:focus { outline: none; border-color: rgba(159,232,255,.6); box-shadow: 0 0 0 3px rgba(159,232,255,.12); }
.check { flex-direction: row; align-items: flex-start; gap: 10px; color: var(--ink); }
.check input { margin-top: 6px; }
.radios { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.radio { flex-direction: row; align-items: center; gap: 10px; padding: 14px; border: 1px solid var(--line); border-radius: 16px; cursor: pointer; color: var(--ink); }
.radio:has(input:checked) { border-color: rgba(243,212,139,.7); background: rgba(243,212,139,.08); }

.app-preview { display: flex; gap: 14px; align-items: center; min-height: 64px; }
.app-preview img { width: 60px; height: 60px; border-radius: 14px; box-shadow: 0 6px 20px rgba(0,0,0,.4); }

.fish-card { display: flex; flex-direction: column; gap: 8px; }
.fish-card .genre { font-size: 12px; letter-spacing: .2em; color: var(--glow); }
.fish-card h3 { margin: 0; }
.fish-card .stats { display: flex; gap: 14px; color: var(--ink-dim); font-size: 13px; }
.fry-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.fry { display: flex; align-items: center; gap: 8px; font-size: 13px; padding: 6px 12px 6px 6px; border-radius: 999px; background: rgba(159,232,255,.08); border: 1px solid var(--line); color: var(--ink); }
.fry img { width: 26px; height: 26px; border-radius: 7px; }

.prose h2 { font-size: 20px; margin-top: 40px; }
.prose ol, .prose ul { padding-left: 1.4em; }
.prose li { margin: 4px 0; }
table.kv { width: 100%; border-collapse: collapse; font-size: 14px; }
table.kv th, table.kv td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.kv th { width: 34%; color: var(--ink-dim); font-weight: normal; }

.notice { padding: 14px 18px; border-radius: 16px; border: 1px solid rgba(243,212,139,.4); background: rgba(243,212,139,.08); color: var(--pearl); font-size: 14px; }
.error { border-color: rgba(255,143,143,.5); background: rgba(255,143,143,.08); }

footer.bottom { margin-top: 96px; padding-top: 28px; border-top: 1px solid var(--line); color: var(--ink-faint); font-size: 13px; display: flex; flex-wrap: wrap; gap: 8px 18px; }
footer.bottom a { color: var(--ink-dim); }

.center { text-align: center; }
.mt { margin-top: 24px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* 運営画面 */
.admin table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin th, .admin td { padding: 8px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.admin .tag { font-size: 11px; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line); white-space: nowrap; }
.admin .tag.warn { border-color: rgba(255,143,143,.6); color: var(--danger); }
.admin form.inline { display: inline-flex; gap: 6px; align-items: center; margin: 2px 0; }
.admin form.inline input[type=text] { width: 160px; padding: 5px 8px; font-size: 12px; }
.admin pre { white-space: pre-wrap; word-break: break-word; margin: 0; font-family: inherit; }

@media (max-width: 560px) {
  header.top { flex-direction: column; align-items: flex-start; }
  nav.links { justify-content: flex-start; gap: 12px; }
  .glass { padding: 20px; }
  .hero { padding: 10vh 0 6vh; }
}
@media (prefers-reduced-motion: reduce) { #sea { display: none; } }