/* The Lucky Duck Web Design Guide — editorial theme
   Palette: pond-teal + warm marigold on warm paper. Fraunces + Work Sans.
   Content is visible with CSS alone; JS is enhancement only. */

:root{
  --teal:#0f5257;
  --teal-deep:#0a3a3e;
  --teal-soft:#e3efee;
  --marigold:#e8a33d;
  --marigold-deep:#c9811a;
  --coral:#e2674a;
  --paper:#faf5ec;
  --surface:#fffdf8;
  --ink:#22312f;
  --muted:#5f6f6b;
  --line:#e6ddcb;
  --shadow:0 1px 2px rgba(15,82,87,.05), 0 8px 28px rgba(15,82,87,.07);
  --shadow-lift:0 6px 16px rgba(15,82,87,.10), 0 18px 44px rgba(15,82,87,.12);
  --maxw:1120px;
  --prose:70ch;
  --radius:14px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Work Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:1.075rem;
  line-height:1.68;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--teal);text-underline-offset:.16em;text-decoration-thickness:.08em}
a:hover{color:var(--teal-deep)}

h1,h2,h3,h4{
  font-family:"Fraunces","Iowan Old Style",Georgia,serif;
  line-height:1.15;
  color:var(--teal-deep);
  font-weight:600;
  margin:0 0 .5em;
  letter-spacing:-.01em;
}
h1{font-size:clamp(2rem,4.4vw,3rem);font-weight:600}
h2{font-size:clamp(1.4rem,2.6vw,1.85rem);margin-top:1.9em}
h3{font-size:1.22rem;margin-top:1.5em}
p{margin:0 0 1.15em}
.lede{font-size:1.24rem;line-height:1.55;color:#33433f;font-family:"Fraunces",Georgia,serif;font-weight:400}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(1rem,4vw,2rem)}

/* -------- skip link -------- */
.skip{position:absolute;left:-999px;top:0;background:var(--teal);color:#fff;padding:.6rem 1rem;z-index:200;border-radius:0 0 8px 0}
.skip:focus{left:0;color:#fff}

/* -------- header / nav -------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(250,245,236,.92);
  backdrop-filter:saturate(1.3) blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:68px}
.brand{display:flex;align-items:center;gap:.6rem;font-family:"Fraunces",Georgia,serif;font-weight:600;color:var(--teal-deep);text-decoration:none;font-size:1.12rem}
.brand:hover{color:var(--teal-deep)}
.brand .duck{width:34px;height:34px;flex:0 0 auto;filter:drop-shadow(0 2px 3px rgba(201,129,26,.35))}
.brand small{display:block;font-family:"Work Sans",sans-serif;font-weight:500;font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--marigold-deep);line-height:1}
.brand .bt{display:flex;flex-direction:column}

.nav-links{display:flex;align-items:center;gap:.35rem;list-style:none;margin:0;padding:0}
.nav-links a{
  display:inline-block;text-decoration:none;color:var(--ink);
  font-weight:500;font-size:.97rem;padding:.45rem .7rem;border-radius:9px;
}
.nav-links a:hover{background:var(--teal-soft);color:var(--teal-deep)}
.nav-links a[aria-current="page"]{color:var(--teal-deep);box-shadow:inset 0 -3px 0 var(--marigold)}

/* pure-CSS mobile menu (no JS dependency) */
.nav-toggle{display:none}
.nav-btn{display:none;cursor:pointer;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:.5rem .7rem;align-items:center;gap:.5rem;font-weight:600;color:var(--teal-deep)}
.nav-btn .bars{display:inline-block;width:18px;height:2px;background:var(--teal-deep);position:relative}
.nav-btn .bars::before,.nav-btn .bars::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--teal-deep)}
.nav-btn .bars::before{top:-6px}.nav-btn .bars::after{top:6px}

@media(max-width:820px){
  .nav-btn{display:inline-flex}
  .nav-links{
    position:absolute;left:0;right:0;top:100%;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--surface);border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-lift);
    max-height:0;overflow:hidden;transition:max-height .28s ease;
  }
  .nav-links a{padding:.85rem 1.4rem;border-top:1px solid var(--line);border-radius:0}
  .nav-toggle:checked ~ .nav-links{max-height:70vh;overflow:auto}
}

/* -------- hero -------- */
.hero{padding:clamp(2.2rem,5vw,3.6rem) 0 1.2rem}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(1.5rem,4vw,3rem);align-items:center}
.hero-eyebrow{display:inline-block;font-weight:600;letter-spacing:.14em;text-transform:uppercase;font-size:.72rem;color:var(--marigold-deep);margin-bottom:.9rem}
.hero h1{margin-bottom:.5rem}
.hero-figure{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lift);border:1px solid var(--line);background:var(--teal-soft);aspect-ratio:16/10}
.hero-figure img{width:100%;height:100%;object-fit:cover}
@media(max-width:820px){.hero-grid{grid-template-columns:1fr}.hero-figure{order:-1;aspect-ratio:16/9}}

.btn{display:inline-block;background:var(--teal);color:#fff;text-decoration:none;font-weight:600;padding:.72rem 1.35rem;border-radius:11px;box-shadow:var(--shadow);transition:transform .12s ease,background .12s ease}
.btn:hover{background:var(--teal-deep);color:#fff;transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--teal-deep);border:1.5px solid var(--teal);box-shadow:none;margin-left:.5rem}
.btn.ghost:hover{background:var(--teal-soft)}
.hero-cta{margin-top:1.4rem}

/* -------- chapter cards (home) -------- */
.section-head{max-width:var(--prose);margin:2.6rem 0 1.4rem}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.1rem}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.3rem 1.3rem 1.4rem;box-shadow:var(--shadow);text-decoration:none;color:var(--ink);
  transition:transform .14s ease,box-shadow .14s ease,border-color .14s ease;display:block;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lift);border-color:var(--marigold);color:var(--ink)}
.card .num{font-family:"Fraunces",Georgia,serif;font-size:.85rem;color:var(--marigold-deep);font-weight:600}
.card h3{margin:.2rem 0 .35rem;font-size:1.16rem}
.card p{margin:0;color:var(--muted);font-size:.96rem;line-height:1.5}

/* -------- article -------- */
.article{padding:2rem 0 1rem}
.article-hero{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lift);border:1px solid var(--line);margin:0 0 2rem;background:var(--teal-soft);aspect-ratio:16/7}
.article-hero img{width:100%;height:100%;object-fit:cover}
.breadcrumb{font-size:.86rem;color:var(--muted);margin-bottom:.4rem}
.breadcrumb a{color:var(--muted)}
.prose{max-width:var(--prose)}
.prose h2{position:relative;padding-top:.2rem}
.prose h2::after{content:"";display:block;width:44px;height:3px;background:var(--marigold);border-radius:3px;margin-top:.5rem}
.prose ul,.prose ol{margin:0 0 1.15em;padding-left:1.3em}
.prose li{margin:.35em 0}
.prose a{font-weight:500}
.prose strong{color:var(--teal-deep)}

/* -------- next-chapter + guide list -------- */
.chapter-nav{max-width:var(--prose);margin:2.4rem 0 0;padding:1.3rem 1.4rem;background:var(--teal-soft);border-radius:var(--radius);border:1px solid #cfe3e1}
.chapter-nav .k{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);font-weight:700}
.chapter-nav a{font-family:"Fraunces",Georgia,serif;font-size:1.15rem;font-weight:600;text-decoration:none}
.chapter-nav a:hover{text-decoration:underline}

/* -------- footer -------- */
.site-footer{margin-top:3.5rem;background:var(--teal-deep);color:#dce9e7}
.site-footer a{color:#eaf3f1;text-decoration:none}
.site-footer a:hover{text-decoration:underline;color:#fff}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:1.6rem;padding:2.6rem 0 1.4rem}
.footer-grid h4{color:#fff;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;font-family:"Work Sans",sans-serif;font-weight:700;margin:0 0 .8rem}
.footer-grid ul{list-style:none;margin:0;padding:0}
.footer-grid li{margin:.4rem 0;font-size:.95rem}
.footer-brand .duck{width:30px;height:30px;margin-bottom:.6rem}
.footer-brand p{color:#b7cfcc;font-size:.92rem;max-width:34ch}
.footer-note{border-top:1px solid rgba(255,255,255,.14);padding:1.1rem 0 2rem;font-size:.85rem;color:#a9c4c1}
.footer-note .disclaimer{max-width:70ch;margin:0 auto 0 0}
@media(max-width:760px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:460px){.footer-grid{grid-template-columns:1fr}}

/* -------- 404 -------- */
.notfound{text-align:center;padding:4rem 0 3rem;max-width:60ch;margin:0 auto}
.notfound .big{font-family:"Fraunces",Georgia,serif;font-size:5rem;color:var(--marigold);line-height:1;margin-bottom:.3rem}

/* -------- CSS-only entrance (ends visible; safe if JS/anim never runs) -------- */
@media (prefers-reduced-motion:no-preference){
  .fade-up{animation:fadeUp .6s both}
  @keyframes fadeUp{from{opacity:.001;transform:translateY(10px)}to{opacity:1;transform:none}}
}
/* Safeguard: never leave content hidden waiting on JS */
[data-aos]{opacity:1 !important;transform:none !important}

.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}