@charset "utf-8";
/* AQUALiving（アクアリビング） — 水草水槽・水草レイアウトの記録
   Theme: "Still Water" — deep planted-tank green, sand ground, serif Japanese headings.
   Layout: fixed left category rail + article column (the original's two-column shape, modernised).
   No UI framework. No JS-gated content. */

:root{
  --deep:#0b3229;
  --deep-2:#134a3c;
  --water:#1f7a5a;
  --water-lite:#2f9a73;
  --leaf:#7fbf95;
  --gold:#bb9445;
  --ink:#1b2622;
  --ink-2:#4a5b55;
  --ink-3:#7b8a84;
  --sand:#f4f2ea;
  --sand-2:#eae6d9;
  --paper:#ffffff;
  --line:#d9d5c6;
  --rail:280px;
  --maxw:1240px;
  --radius:3px;
  --shadow:0 1px 2px rgba(11,50,41,.06), 0 8px 28px rgba(11,50,41,.06);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--sand);
  color:var(--ink);
  font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,system-ui,sans-serif;
  font-size:16px;
  line-height:1.95;
  letter-spacing:.02em;
  font-feature-settings:"palt" 1;
}
img{max-width:100%;height:auto;display:block;}
a{color:var(--water);text-underline-offset:.22em;text-decoration-thickness:1px;}
a:hover{color:var(--deep);}

/* ---------- skip link ---------- */
.skip{position:absolute;left:-9999px;top:0;background:var(--gold);color:#fff;padding:.6em 1em;z-index:100;}
.skip:focus{left:0;}

/* ---------- header ---------- */
.site-head{background:var(--deep);color:#eef3f0;position:relative;}
.site-head::after{
  content:"";display:block;height:4px;
  background:linear-gradient(90deg,var(--deep) 0%,var(--water) 22%,var(--leaf) 50%,var(--water) 78%,var(--deep) 100%);
}
.head-inner{
  max-width:var(--maxw);margin:0 auto;padding:1.15rem 1.5rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;
}
.brand{display:flex;align-items:baseline;gap:.75rem;text-decoration:none;color:inherit;min-width:0;}
.brand .mark{
  font-family:"Noto Serif JP",serif;font-weight:700;font-size:1.6rem;letter-spacing:.06em;
  color:#fff;white-space:nowrap;
}
.brand .mark em{font-style:normal;color:var(--leaf);}
.brand .sub{font-size:.72rem;color:#a9c6ba;letter-spacing:.22em;white-space:nowrap;}
.tagline{font-size:.74rem;color:#93b3a7;letter-spacing:.08em;margin:0;max-width:34ch;line-height:1.7;}

/* ---------- nav (CSS-only mobile toggle: never JS-gated) ---------- */
.nav-toggle{position:absolute;opacity:0;pointer-events:none;}
.nav-btn{
  display:none;align-items:center;gap:.5rem;cursor:pointer;
  border:1px solid rgba(255,255,255,.35);border-radius:var(--radius);
  padding:.45rem .8rem;font-size:.85rem;color:#eef3f0;
}
.site-nav{background:var(--deep-2);}
.site-nav ul{
  max-width:var(--maxw);margin:0 auto;padding:0 1.1rem;
  list-style:none;display:flex;flex-wrap:wrap;gap:0;
}
.site-nav a{
  display:block;padding:.75rem 1rem;color:#dcebe4;text-decoration:none;
  font-size:.86rem;letter-spacing:.05em;border-bottom:3px solid transparent;
}
.site-nav a:hover{background:rgba(255,255,255,.07);color:#fff;}
.site-nav a[aria-current="page"]{border-bottom-color:var(--leaf);color:#fff;background:rgba(255,255,255,.06);}

/* ---------- shell ---------- */
.shell{
  max-width:var(--maxw);margin:0 auto;padding:2rem 1.5rem 3.5rem;
  display:grid;grid-template-columns:var(--rail) minmax(0,1fr);gap:2.5rem;align-items:start;
}
.shell.wide{grid-template-columns:minmax(0,1fr);}

/* ---------- rail ---------- */
.rail{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.25rem 1.25rem 1.5rem;box-shadow:var(--shadow);position:sticky;top:1rem;
}
.rail h2{
  font-family:"Noto Serif JP",serif;font-size:.9rem;letter-spacing:.14em;margin:0 0 .9rem;
  color:var(--deep);border-bottom:2px solid var(--sand-2);padding-bottom:.55rem;
}
.rail ul{list-style:none;margin:0 0 1.35rem;padding:0;}
.rail li{margin:0;}
.rail li a{
  display:block;padding:.4rem 0 .4rem .95rem;font-size:.83rem;line-height:1.65;
  color:var(--ink-2);text-decoration:none;border-left:2px solid var(--sand-2);
}
.rail li a:hover{color:var(--water);border-left-color:var(--leaf);background:#fbfaf6;}
.rail li a[aria-current="page"]{color:var(--deep);font-weight:700;border-left-color:var(--gold);}
.rail .rail-note{font-size:.75rem;color:var(--ink-3);line-height:1.8;margin:0;}

/* ---------- article ---------- */
.article{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:2.5rem 2.75rem 3rem;box-shadow:var(--shadow);min-width:0;
}
.crumb{font-size:.76rem;color:var(--ink-3);margin:0 0 1.25rem;letter-spacing:.04em;}
.crumb a{color:var(--ink-2);}
.article h1{
  font-family:"Noto Serif JP",serif;font-weight:700;font-size:1.85rem;line-height:1.55;
  margin:0 0 1.6rem;color:var(--deep);padding-bottom:1rem;position:relative;
}
.article h1::after{content:"";position:absolute;left:0;bottom:0;width:72px;height:3px;background:var(--gold);}
.article h2{
  font-family:"Noto Serif JP",serif;font-weight:700;font-size:1.28rem;line-height:1.7;
  margin:2.6rem 0 1rem;color:var(--deep-2);
  border-left:5px solid var(--water);padding:.15rem 0 .15rem .85rem;
}
.article h3{
  font-family:"Noto Serif JP",serif;font-size:1.06rem;margin:2rem 0 .7rem;color:var(--deep-2);
  border-bottom:1px dotted var(--line);padding-bottom:.4rem;
}
.article p{margin:0 0 1.35rem;}
.article ul,.article ol{margin:0 0 1.5rem;padding-left:1.45rem;}
.article li{margin:0 0 .5rem;}
.article strong{color:var(--deep);font-weight:700;}
.article figure{margin:2rem 0;}
.article figure img{border:1px solid var(--line);border-radius:var(--radius);width:100%;}
.article figcaption{font-size:.78rem;color:var(--ink-3);margin-top:.6rem;line-height:1.75;}

/* spec block — the 図鑑 data table */
.article table{
  width:100%;border-collapse:collapse;margin:0 0 1.75rem;font-size:.9rem;
  background:#fbfaf6;border:1px solid var(--line);
}
.article table th,.article table td{
  border:1px solid var(--line);padding:.7rem .95rem;text-align:left;vertical-align:top;line-height:1.8;
}
.article table th{background:var(--sand-2);color:var(--deep);font-weight:700;white-space:nowrap;width:9em;}
.article dl{
  margin:0 0 1.75rem;padding:1.15rem 1.35rem;background:#fbfaf6;
  border:1px solid var(--line);border-left:5px solid var(--leaf);border-radius:var(--radius);
  display:grid;grid-template-columns:8.5em minmax(0,1fr);gap:.35rem 1rem;font-size:.92rem;
}
.article dt{color:var(--deep);font-weight:700;margin:0;}
.article dd{margin:0;color:var(--ink-2);}
.article blockquote{
  margin:0 0 1.6rem;padding:1rem 1.3rem;background:var(--sand);border-left:4px solid var(--gold);
  color:var(--ink-2);font-size:.94rem;
}

/* ---------- hero ----------
   Grid stack, not an absolutely-positioned overlay: the row height is
   max(image min-height, copy height), so long Japanese headings can never be
   clipped at any viewport width. Width-independent by construction. */
.hero{
  position:relative;display:grid;align-items:center;overflow:hidden;
  background:var(--deep);min-height:clamp(230px,28vw,420px);
}
.hero > img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.6;
}
.hero-copy{
  position:relative;z-index:1;width:100%;
  display:flex;flex-direction:column;justify-content:center;
  max-width:var(--maxw);margin:0 auto;padding:2.25rem 2rem;
}
.hero-copy h1{
  font-family:"Noto Serif JP",serif;color:#fff;font-size:clamp(1.2rem,2.6vw,2.1rem);
  line-height:1.55;margin:0 0 .7rem;text-shadow:0 2px 18px rgba(0,0,0,.6);max-width:24ch;
}
.hero-copy p{
  color:#e2efe8;margin:0;font-size:clamp(.8rem,1.35vw,.98rem);max-width:48ch;
  text-shadow:0 2px 14px rgba(0,0,0,.65);line-height:1.9;
}

/* ---------- section cards ---------- */
.cards{list-style:none;margin:0 0 2rem;padding:0;display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));}
.cards li{margin:0;}
.cards a{
  display:block;height:100%;padding:1.25rem 1.35rem;background:#fbfaf6;
  border:1px solid var(--line);border-top:3px solid var(--water);border-radius:var(--radius);
  text-decoration:none;color:var(--ink);transition:transform .18s ease,box-shadow .18s ease;
}
.cards a:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-top-color:var(--gold);}
.cards strong{display:block;font-family:"Noto Serif JP",serif;font-size:1.02rem;color:var(--deep);margin-bottom:.45rem;}
.cards span{display:block;font-size:.82rem;color:var(--ink-2);line-height:1.8;}

/* ---------- footer ---------- */
.site-foot{background:var(--deep);color:#c6dcd2;margin-top:0;}
.foot-inner{
  max-width:var(--maxw);margin:0 auto;padding:2.75rem 1.5rem 1.5rem;
  display:grid;gap:2rem;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
}
.site-foot h2{
  font-family:"Noto Serif JP",serif;font-size:.82rem;letter-spacing:.2em;color:#fff;
  margin:0 0 .9rem;padding-bottom:.5rem;border-bottom:1px solid rgba(255,255,255,.18);
}
.site-foot p{margin:0 0 .8rem;font-size:.8rem;line-height:1.95;}
.site-foot ul{list-style:none;margin:0;padding:0;}
.site-foot li{margin:0 0 .35rem;font-size:.8rem;}
.site-foot a{color:#bfe0d1;text-decoration:none;}
.site-foot a:hover{color:#fff;text-decoration:underline;}
.foot-base{
  border-top:1px solid rgba(255,255,255,.14);
  max-width:var(--maxw);margin:0 auto;padding:1rem 1.5rem 2rem;
  font-size:.73rem;color:#8fada2;letter-spacing:.04em;
}

/* ---------- 404 ---------- */
.nf{max-width:760px;margin:0 auto;text-align:center;padding:3.5rem 1.5rem 4.5rem;}
.nf .code{font-family:"Noto Serif JP",serif;font-size:4.5rem;color:var(--leaf);margin:0 0 .6rem;line-height:1;}
.nf h1::after{left:50%;transform:translateX(-50%);}
.nf .cards{margin-top:2rem;}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  :root{--rail:240px;}
  .article{padding:2rem 1.9rem 2.4rem;}
}
@media (max-width:900px){
  .shell{grid-template-columns:minmax(0,1fr);gap:1.75rem;padding:1.5rem 1.1rem 3rem;}
  .rail{position:static;}
  .nav-btn{display:inline-flex;}
  .site-nav ul{display:none;flex-direction:column;padding:0 1.1rem .6rem;}
  .nav-toggle:checked ~ .site-nav ul{display:flex;}
  .site-nav a{border-bottom:1px solid rgba(255,255,255,.08);}
  .site-nav a[aria-current="page"]{border-bottom-color:var(--leaf);}
  .tagline{display:none;}
  .article h1{font-size:1.5rem;}
  .article{padding:1.6rem 1.25rem 2rem;}
  .article dl{grid-template-columns:minmax(0,1fr);gap:.15rem;}
  .article dt{margin-top:.6rem;}
}
@media (max-width:520px){
  body{font-size:15.5px;}
  .brand .mark{font-size:1.32rem;}
  .article table th{width:auto;white-space:normal;}
}

/* ---------- safeguard: content is NEVER hidden waiting on JavaScript ---------- */
[data-aos]{opacity:1 !important;transform:none !important;}

@media print{.site-nav,.rail,.nav-btn{display:none;}.article{border:0;box-shadow:none;}}