/* ============================================================
   Fable Katamari — docs site
   warm dark theme / game palette (deep navy + gold gradient)
   ============================================================ */

:root{
  --bg:        #0b0c14;
  --bg-2:      #10121d;
  --card:      #161927;
  --card-2:    #1c2032;
  --line:      #272c42;
  --line-soft: #20243a;
  --ink:       #eceaf4;
  --body:      #c9ccdd;
  --muted:     #9b9fb7;
  --gold:      #ffc94d;
  --amber:     #ff9d4d;
  --coral:     #ff6b8a;
  --sky:       #7ec8ff;
  --green:     #6fe3a5;
  --violet:    #b28dff;
  --grad:      linear-gradient(96deg,#ffd76b 0%,#ff9d4d 48%,#ff6b8a 100%);
  --grad-soft: linear-gradient(96deg,rgba(255,215,107,.16),rgba(255,107,138,.16));
}

*,*::before,*::after{ box-sizing:border-box; }

html{ -webkit-text-size-adjust:100%; }

body{
  margin:0;
  background:
    radial-gradient(1100px 520px at 85% -160px, rgba(255,157,77,.10), transparent 60%),
    radial-gradient(900px 480px at -120px 12%, rgba(126,110,255,.09), transparent 60%),
    var(--bg);
  color:var(--body);
  font-family:"Helvetica Neue",Arial,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic UI",Meiryo,system-ui,sans-serif;
  font-size:17.5px;
  line-height:1.9;
  font-feature-settings:"palt";
  overflow-wrap:anywhere;
}

@media (max-width:480px){ body{ font-size:16.5px; } }

@media (prefers-reduced-motion:no-preference){
  html{ scroll-behavior:smooth; }
}

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

strong{ color:var(--ink); }
em{ font-style:normal; background:linear-gradient(transparent 62%, rgba(255,201,77,.28) 62%); }

.wrap{ max-width:760px; margin:0 auto; padding:0 20px; }

/* ---------- top nav ---------- */
.nav{
  position:sticky; top:0; z-index:50;
  background:rgba(11,12,20,.82);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-soft);
}
.nav-inner{
  max-width:980px; margin:0 auto; padding:0 20px;
  display:flex; align-items:center; gap:8px; height:56px;
}
.brand{
  display:flex; align-items:center; gap:9px;
  font-weight:800; letter-spacing:.04em; color:var(--ink); font-size:.92em;
  margin-right:auto; white-space:nowrap;
}
.brand:hover{ text-decoration:none; }
.brand-ball{
  width:18px; height:18px; border-radius:50%; flex:none;
  background:radial-gradient(circle at 32% 30%, #ffe9a8, #ff9d4d 55%, #d8643c);
  box-shadow:0 0 12px rgba(255,170,80,.55);
}
.nav-links{ display:flex; gap:4px; }
.nav-links a{
  color:var(--muted); font-size:.84em; font-weight:600;
  padding:7px 11px; border-radius:999px; white-space:nowrap;
}
.nav-links a:hover{ color:var(--ink); background:var(--card-2); text-decoration:none; }
.nav-links a[aria-current="page"]{ color:var(--gold); background:rgba(255,201,77,.10); }
.nav-links a.play{ color:#241404; background:var(--grad); font-weight:800; }
.nav-links a.play:hover{ filter:brightness(1.08); }
@media (max-width:430px){
  .nav-inner{ padding:0 12px; }
  .brand span{ display:none; }
  .nav-links a{ padding:7px 9px; font-size:.8em; }
}

/* ---------- hero ---------- */
.hero{ padding:74px 0 18px; text-align:center; }
.hero h1{
  margin:0 0 6px; font-size:clamp(36px,8vw,62px); line-height:1.18;
  letter-spacing:.03em; font-weight:900;
  background:var(--grad);
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent; color:transparent;
  filter:drop-shadow(0 4px 24px rgba(255,150,70,.25));
}
.hero .tagline{ margin:0 0 26px; color:var(--muted); font-size:1.0em; letter-spacing:.06em; }
.hero .catch{ font-size:1.12em; color:var(--ink); font-weight:700; margin:0 0 14px; }
.hero .lead{ text-align:left; }

.cta{
  display:inline-block; margin:24px auto 8px;
  background:var(--grad); color:#241404; font-weight:800; font-size:1.02em;
  padding:15px 38px; border-radius:999px;
  box-shadow:0 10px 34px rgba(255,150,70,.32);
}
.cta:hover{ text-decoration:none; filter:brightness(1.07); }
.cta-note{ font-size:.78em; color:var(--muted); margin-top:8px; }

/* ---------- stats ---------- */
.stats{
  display:grid; grid-template-columns:repeat(4,1fr); gap:12px;
  margin:34px 0 10px;
}
@media (max-width:560px){ .stats{ grid-template-columns:repeat(2,1fr); } }
.stat{
  background:var(--card); border:1px solid var(--line); border-radius:16px;
  padding:18px 6px 14px; text-align:center;
}
.stat b{
  display:block; font-size:1.6em; line-height:1.25; font-weight:800;
  background:var(--grad);
  -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent; color:transparent;
}
.stat small{ font-size:.72em; color:var(--muted); letter-spacing:.04em; }

/* ---------- sections / headings ---------- */
main{ padding-bottom:40px; }
section{ margin-top:24px; }

/* anchored targets clear the sticky nav */
[id]{ scroll-margin-top:72px; }

h2{
  color:var(--ink); font-size:1.55em; line-height:1.4;
  margin:84px 0 18px; padding-top:20px; position:relative;
}
h2::before{
  content:""; position:absolute; top:0; left:0;
  width:48px; height:4px; border-radius:2px; background:var(--grad);
}
h3{ color:var(--ink); font-size:1.16em; line-height:1.5; margin:46px 0 10px; }
h3 .no{
  display:inline-block; margin-right:8px; padding:1px 10px; border-radius:999px;
  background:var(--grad-soft); border:1px solid rgba(255,180,90,.35);
  color:var(--gold); font-size:.78em; vertical-align:2px;
}
h4{ color:var(--ink); font-size:1.0em; margin:34px 0 8px; }

p{ margin:14px 0; }
ul,ol{ padding-left:1.5em; margin:14px 0; }
li{ margin:6px 0; }
li::marker{ color:var(--amber); }
hr{ border:none; border-top:1px solid var(--line-soft); margin:56px 0; }

.note{ font-size:.86em; color:var(--muted); }

/* ---------- tables ---------- */
.table-scroll{ overflow-x:auto; margin:18px -20px; padding:0 20px; }
table{
  border-collapse:collapse; width:100%; min-width:480px;
  font-size:.83em; line-height:1.65;
}
th,td{ padding:9px 12px; border-bottom:1px solid var(--line-soft); text-align:left; vertical-align:top; }
th{ color:var(--gold); font-weight:700; white-space:nowrap; border-bottom:2px solid var(--line); }
tbody tr:nth-child(even){ background:rgba(255,255,255,.022); }
td.num,th.num{ text-align:right; font-variant-numeric:tabular-nums; white-space:nowrap; }
td b,table strong{ color:var(--ink); }
td b:only-child{ white-space:nowrap; }

/* ---------- speech bubble (owner quotes) ---------- */
.bubble{
  position:relative; margin:22px 0 22px 10px;
  background:linear-gradient(180deg,#1d2134,#181c2c);
  border:1px solid #303756; border-radius:18px;
  padding:14px 20px;
  box-shadow:0 6px 24px rgba(0,0,0,.25);
}
.bubble::before{
  content:""; position:absolute; left:-9px; top:26px;
  width:16px; height:16px; transform:rotate(45deg);
  background:#1d2134; border-left:1px solid #303756; border-bottom:1px solid #303756;
}
.bubble .who{
  display:block; color:var(--gold); font-size:.78em; font-weight:800;
  letter-spacing:.08em; margin-bottom:2px;
}
.bubble p{ margin:6px 0; font-size:.95em; }

/* ---------- timeline ---------- */
.timeline{ position:relative; margin-top:30px; }
.timeline::before{
  content:""; position:absolute; left:21px; top:8px; bottom:8px; width:3px;
  border-radius:2px;
  background:linear-gradient(180deg,#ffd76b,#ff9d4d 38%,#ff6b8a 70%,#b28dff);
  opacity:.55;
}
.tl-item{ position:relative; padding:4px 0 10px 66px; margin:0 0 36px; }
.tl-badge{
  position:absolute; left:0; top:14px; width:44px; height:44px; border-radius:50%;
  background:var(--grad); color:#241404; font-weight:900; font-size:.92em;
  display:grid; place-items:center;
  box-shadow:0 6px 20px rgba(255,150,70,.35), 0 0 0 6px var(--bg);
}
.tl-item h3{ margin-top:10px; }
.tl-theme{
  display:inline-block; margin-left:10px; padding:2px 12px; border-radius:999px;
  background:var(--card-2); border:1px solid var(--line);
  color:var(--muted); font-size:.72em; font-weight:600; vertical-align:3px;
}
@media (max-width:480px){
  .tl-item{ padding-left:50px; }
  .timeline::before{ left:15px; }
  .tl-badge{ width:32px; height:32px; font-size:.78em; }
}

/* ---------- accordions ---------- */
details.acc{
  background:var(--card); border:1px solid var(--line); border-radius:15px;
  margin:16px 0; overflow:hidden;
}
details.acc summary{
  position:relative; cursor:pointer; list-style:none;
  padding:15px 56px 15px 18px;
  color:var(--ink); font-weight:700; font-size:.95em; line-height:1.55;
}
details.acc summary::-webkit-details-marker{ display:none; }
details.acc summary::before{
  content:"エンジニア向け"; display:block;
  font-size:.68em; font-weight:700; letter-spacing:.1em; color:var(--amber);
  margin-bottom:2px;
}
details.acc summary::after{
  content:"+"; position:absolute; right:14px; top:50%;
  width:28px; height:28px; margin-top:-14px;
  display:grid; place-items:center;
  background:var(--grad); color:#241404; border-radius:50%;
  font-size:19px; font-weight:800; line-height:1;
  transition:transform .25s ease;
}
details.acc[open] summary::after{ transform:rotate(45deg); }
details.acc summary:hover{ background:rgba(255,255,255,.025); }
.acc-body{
  padding:2px 18px 16px; font-size:.92em; color:var(--body);
  border-top:1px dashed var(--line-soft);
}
.acc-body p:first-child{ margin-top:12px; }
@media (prefers-reduced-motion:reduce){
  details.acc summary::after{ transition:none; }
}

/* ---------- figures / screenshots ---------- */
figure{ margin:24px 0; }
figure img{
  width:100%; height:auto; display:block;
  border-radius:14px; border:1px solid var(--line);
  background:var(--bg-2);
  box-shadow:0 10px 36px rgba(0,0,0,.35);
}
figcaption{
  font-size:.8em; color:var(--muted); text-align:center; margin-top:9px; line-height:1.6;
}
.shots{
  display:grid; gap:16px; margin:24px 0;
  grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
}
.shots figure{ margin:0; }
.shots-tall{ grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); }
.shots-tall figure img{ border-radius:18px; }

/* ---------- diagrams ---------- */
figure.diagram{
  background:var(--card); border:1px solid var(--line); border-radius:18px;
  padding:20px 14px 10px; margin:26px 0;
}
figure.diagram svg{ width:100%; height:auto; display:block; }
figure.diagram figcaption{ margin-top:4px; padding:0 6px 6px; }
@media (max-width:600px){
  figure.diagram{ overflow-x:auto; -webkit-overflow-scrolling:touch; }
  figure.diagram svg{ min-width:600px; }
  figure.diagram figcaption{ position:sticky; left:0; }
  figure.diagram::before{
    content:"⇄ 図は横にスクロールできます";
    position:sticky; left:0;
    display:block; text-align:center;
    font-size:.7em; color:var(--muted); letter-spacing:.05em;
    margin:-6px 0 8px;
  }
}

/* svg shared classes */
.dg .box      { fill:#1d2133; stroke:#3a4160; stroke-width:1.5; }
.dg .box-soft { fill:#171a29; stroke:#2c3250; stroke-width:1.2; }
.dg .box-gold { fill:#2b2310; stroke:#a87e2e; stroke-width:1.6; }
.dg .box-sky  { fill:#152234; stroke:#3d6f9e; stroke-width:1.5; }
.dg .box-coral{ fill:#2b1722; stroke:#a04a64; stroke-width:1.5; }
.dg .box-green{ fill:#13261d; stroke:#3f8a63; stroke-width:1.5; }
.dg .box-violet{ fill:#221b34; stroke:#6b54a8; stroke-width:1.5; }
.dg text      { font-family:inherit; fill:#e9e7f2; font-size:15px; }
.dg .tt       { font-weight:700; font-size:16px; }
.dg .ts       { font-size:12.5px; fill:#9ba0b9; }
.dg .tg       { fill:#ffc94d; }
.dg .tc       { fill:#ff8aa3; }
.dg .tb       { fill:#8ecdff; }
.dg .tv       { fill:#c4a8ff; }
.dg .tgr      { fill:#7fe6ad; }
.dg .ln       { stroke:#8d93b0; stroke-width:2; fill:none; }
.dg .ln-soft  { stroke:#565d7c; stroke-width:1.6; fill:none; }
.dg .ln-dash  { stroke:#565d7c; stroke-width:1.6; fill:none; stroke-dasharray:5 5; }
.dg .ln-gold  { stroke:#d9a83f; stroke-width:2; fill:none; }

/* ---------- code ---------- */
code{
  font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  font-size:.82em; color:#ffd9a0;
  background:rgba(255,201,77,.09); border:1px solid rgba(255,201,77,.14);
  border-radius:6px; padding:1px 6px;
}
pre{
  background:#0d0f1a; border:1px solid var(--line); border-radius:13px;
  padding:16px 18px; overflow-x:auto; margin:18px 0;
  line-height:1.65;
}
pre code{
  background:none; border:none; padding:0;
  color:#ccd3ec; font-size:.78em; white-space:pre;
}

/* ---------- design page extras ---------- */
.doc-meta{
  background:var(--card); border:1px solid var(--line); border-radius:15px;
  padding:6px 18px; margin:26px 0; font-size:.9em;
}
.kicker{
  font-size:.74em; font-weight:800; letter-spacing:.18em;
  color:var(--amber); text-transform:uppercase; margin:80px 0 -72px;
}

/* ---------- footer ---------- */
footer{
  border-top:1px solid var(--line-soft); margin-top:80px;
  padding:38px 0 56px; text-align:center;
  font-size:.82em; color:var(--muted);
}
footer .f-ball{
  width:14px; height:14px; border-radius:50%; display:inline-block; vertical-align:-2px;
  background:radial-gradient(circle at 32% 30%, #ffe9a8, #ff9d4d 55%, #d8643c);
  margin-right:6px;
}
footer p{ margin:6px 0; }

/* ---------- reveal on scroll (CSS only) ---------- */
@media (prefers-reduced-motion:no-preference){
  @supports (animation-timeline: view()){
    .reveal{
      animation:rise-in linear both;
      animation-timeline:view();
      animation-range:entry 0% entry 34%;
    }
  }
}
@keyframes rise-in{
  from{ opacity:0; transform:translateY(26px); }
  to{ opacity:1; transform:none; }
}

::selection{ background:rgba(255,157,77,.35); color:#fff; }