/* StepSpoon — static cooking-steps site
   Theme: green-primary, geometric sans (Outfit / Manrope)
   All files are English-only (no Chinese in source/comments). */

:root {
  --green-50:  #f0fdf4;
  --green-100: #dcfce7;
  --green-200: #bbf7d0;
  --green-300: #86efac;
  --green-400: #4ade80;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  --green-800: #166534;
  --green-900: #14532d; /* footer + anchor reserved bg */
  --ink:      #0f1f17;
  --muted:    #56706a;
  --line:     #e2ebe6;
  --paper:    #ffffff;
  --surface:  #f7faf8;
  --shadow:   0 10px 30px rgba(20, 83, 45, 0.08);
  --shadow-lg:0 18px 50px rgba(20, 83, 45, 0.14);
  --radius:   18px;
  --radius-sm:12px;
  --maxw:     1140px;
  --footer-bg: var(--green-900);
  --footer-fg: #e8f6ec;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Outfit", "Manrope", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 72px; /* room for anchor bar */
}

img { max-width: 100%; display: block; }

a { color: var(--green-700); text-decoration: none; }
a:hover { color: var(--green-800); }

h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.25rem; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--green-600); color: #fff; font-weight: 700;
  padding: 14px 26px; border-radius: 999px; border: none; cursor: pointer;
  font-size: 1rem; font-family: inherit; transition: transform .15s ease, background .15s ease, box-shadow .15s ease;
  box-shadow: 0 8px 20px rgba(22,163,74,.28);
}
.btn:hover { background: var(--green-700); transform: translateY(-1px); color:#fff; }
.btn--ghost { background: transparent; color: var(--green-700); border: 2px solid var(--green-200); box-shadow: none; }
.btn--ghost:hover { background: var(--green-50); }
.btn--dark { background: var(--green-900); box-shadow: 0 8px 20px rgba(20,83,45,.3); }
.btn--dark:hover { background: #0f3d22; }
.btn--block { width: 100%; justify-content: center; }
/* Disabled buttons must stay readable (e.g. "Previous" on step 1). */
.btn:disabled {
  opacity: .62;
  background: #fff;
  color: var(--green-800);
  border: 2px solid var(--green-300);
  box-shadow: none;
  cursor: default;
  transform: none;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.25rem; color: var(--ink); }
.brand .logo { width: 34px; height: 34px; }
.brand .brand-name { color: var(--green-700); }
.nav-links { display: flex; align-items: center; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--ink); font-weight: 600; font-size: .98rem; }
.nav-links a:hover { color: var(--green-700); }
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer; padding: 8px;
  flex-direction: column; gap: 5px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: .2s; }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(1200px 500px at 80% -10%, var(--green-100), transparent 60%),
    linear-gradient(180deg, var(--green-50), #fff);
  padding: 70px 0 56px;
  border-bottom: 1px solid var(--line);
}
.hero .container { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.hero h1 { margin-bottom: 14px; }
.hero .lead { font-size: 1.15rem; color: var(--muted); max-width: 46ch; margin-bottom: 26px; }
.hero-art { width: 100%; border-radius: 24px; box-shadow: var(--shadow-lg); }
.eyebrow {
  display: inline-block; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  font-size: .78rem; color: var(--green-700); background: var(--green-100);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 16px;
}

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 36px; }
.stat { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 18px; text-align: center; }
.stat b { display: block; font-size: 1.7rem; color: var(--green-700); }
.stat span { color: var(--muted); font-size: .9rem; }

/* ---------- Sections ---------- */
.section { padding: 56px 0; }
.section--alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 34px; }
.section-head p { color: var(--muted); }

/* ---------- Category cards ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cat-card {
  position: relative; overflow: hidden; border-radius: var(--radius); color: #fff;
  min-height: 220px; display: flex; flex-direction: column; justify-content: flex-end;
  padding: 22px; box-shadow: var(--shadow); transition: transform .18s ease, box-shadow .18s ease;
}
.cat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.cat-card .cat-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; }
.cat-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(15,40,25,.05), rgba(15,40,25,.72)); z-index: 1; }
.cat-card .cat-icon { position: relative; z-index: 2; width: 46px; height: 46px; margin-bottom: auto; }
.cat-card h3, .cat-card p { position: relative; z-index: 2; margin: 0; }
.cat-card h3 { font-size: 1.35rem; }
.cat-card p { color: rgba(255,255,255,.85); font-size: .92rem; margin-top: 6px; }

/* ---------- Recipe cards ---------- */
.recipe-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.recipe-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; transition: transform .18s ease, box-shadow .18s ease;
}
.recipe-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.recipe-card .thumb { aspect-ratio: 3 / 2; width: 100%; object-fit: cover; background: var(--green-50); }
.recipe-card .body { padding: 16px 18px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.recipe-card .cat-tag { font-size: .74rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--green-700); }
.recipe-card h3 { font-size: 1.12rem; margin: 0; }
.recipe-card p { color: var(--muted); font-size: .92rem; margin: 0 0 auto; }
.recipe-card .meta { display: flex; gap: 14px; color: var(--muted); font-size: .82rem; margin-top: 6px; }

/* ---------- Article (detail) ---------- */
.article { max-width: 760px; margin: 0 auto; }
.article-head { text-align: center; padding: 40px 0 10px; }
.article-head .cat-tag { color: var(--green-700); font-weight: 700; letter-spacing: .06em; text-transform: uppercase; font-size: .8rem; }
.article-head h1 { margin: 10px 0; }
.article-date { color: var(--muted); font-size: .9rem; }
.article-hero { width: 100%; border-radius: var(--radius); margin: 22px 0; box-shadow: var(--shadow); }
.article-body p { font-size: 1.06rem; color: #1c2b24; margin: 0 0 18px; }
.article-body h3 { margin-top: 30px; color: var(--green-800); }

/* Step player (Take the Gavel equivalent) */
.step-player {
  background: var(--green-50); border: 1px solid var(--green-200); border-radius: var(--radius);
  padding: 22px; margin: 26px 0; box-shadow: var(--shadow);
}
.step-player .sp-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.step-player .sp-counter { font-weight: 700; color: var(--green-700); }
.step-player .sp-progress { height: 8px; background: var(--green-100); border-radius: 999px; overflow: hidden; margin-bottom: 16px; }
.step-player .sp-bar { height: 100%; width: 0; background: var(--green-600); transition: width .3s ease; border-radius: 999px; }
.step-player .sp-step-title { font-size: 1.2rem; margin: 0 0 8px; color: var(--green-800); }
.step-player .sp-step-text { color: #1c2b24; margin: 0 0 18px; }
.step-player .sp-actions { display: flex; gap: 12px; }
.step-player .sp-dot { display:inline-block; width:10px; height:10px; border-radius:50%; background: var(--green-400); margin-right:6px; }

/* Page-flip transition between steps */
.step-player .sp-flipbox { perspective: 1200px; }
.step-player .sp-page { transform-origin: left center; backface-visibility: hidden; }
.step-player .sp-page.flip-next { animation: spFlipNext .45s ease; }
.step-player .sp-page.flip-prev { transform-origin: right center; animation: spFlipPrev .45s ease; }
@keyframes spFlipNext {
  0%   { transform: rotateY(-65deg); opacity: 0; }
  100% { transform: rotateY(0deg);   opacity: 1; }
}
@keyframes spFlipPrev {
  0%   { transform: rotateY(65deg);  opacity: 0; }
  100% { transform: rotateY(0deg);   opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .step-player .sp-page.flip-next,
  .step-player .sp-page.flip-prev { animation: none; }
}

/* Done state: hide the live player, show the summary + back button */
.step-player .sp-done { display: none; }
.step-player.is-done .sp-live { display: none; }
.step-player.is-done .sp-done { display: block; }
.step-player .sp-done .btn { margin-top: 10px; }

.sp-done { text-align: center; padding: 14px 0; }
.sp-done .sp-emoji { font-size: 2.4rem; }

/* Related */
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

/* ---------- Footer ----------
   Brand intro block sits ABOVE the link columns (footer-brand). */
.site-footer { background: var(--footer-bg); color: var(--footer-fg); padding: 46px 0 30px; margin-top: 40px; }
.site-footer a { color: var(--green-200); }
.site-footer a:hover { color: #fff; }
.footer-brand { padding-bottom: 26px; margin-bottom: 28px; border-bottom: 1px solid rgba(255,255,255,.14); }
.footer-brand h4 { font-size: 1.15rem; }
.footer-grid--two { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; max-width: 640px; }
.site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 12px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.site-footer .foot-note { color: rgba(232,246,236,.7); font-size: .88rem; max-width: 52ch; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 28px; padding-top: 18px; font-size: .82rem; color: rgba(232,246,236,.7); }
.cookie-note { font-size: .8rem; color: rgba(232,246,236,.75); margin-top: 14px; }

/* Master off-switch: while ads are not connected (ADS_VISIBLE=false in ads.js),
   every ad surface stays fully hidden. Flip the switch to turn them back on. */
body.ads-hidden { padding-bottom: 0; }
body.ads-hidden .ad-wrap,
body.ads-hidden .ad-slot,
body.ads-hidden #adAnchor,
body.ads-hidden #adInterstitial { display: none !important; }

/* ---------- AD SYSTEM ---------- */
/* Inline slots are VISIBLE by default in demo (AD_DEMO). Real creatives
   are detected in pure CSS via :has() — no JS class writes on inline slots,
   so the "late iframe stays hidden" bug and the MutationObserver-freeze bug
   are both structurally impossible. */
.ad-wrap { width: 100%; max-width: 336px; margin: 26px auto; text-align: center; }
.ad-wrap--full { max-width: 100%; }

.ad-slot {
  width: 100%;
  min-height: 250px;
  display: flex; align-items: center; justify-content: center;
  border: 2px dashed var(--green-300);
  border-radius: var(--radius-sm);
  background: var(--green-50);
  color: var(--muted);
  position: relative;
  overflow: hidden;
}
.ad-slot::after {
  content: "advertisement";
  font-size: .72rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--green-600); opacity: .8;
}
/* When a real creative lands, drop the placeholder chrome (pure CSS, freeze-proof). */
.ad-slot:has(iframe),
.ad-slot:has(ins[data-ad-status="filled"]) {
  border: none; background: transparent; min-height: 0; padding: 0;
}
.ad-slot:has(iframe)::after,
.ad-slot:has(ins[data-ad-status="filled"])::after { content: ""; }

/* Production (no demo): empty slots start hidden, revealed only when filled.
   The MutationObserver in ads.js removes .is-empty once a real creative appears. */
body:not([data-ad-demo="true"]) .ad-slot.is-empty { display: none; }

/* Anchor (bottom floating bar, 320x50). Reserved padding bg = footer bg. */
#adAnchor {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 35;
  display: flex; justify-content: center; align-items: center;
  min-height: 56px; padding: 6px 0;
  background: var(--footer-bg); /* reserved padding bg matches footer */
  box-shadow: 0 -6px 20px rgba(0,0,0,.12);
}
#adAnchor .ad-slot { min-height: 50px; max-width: 320px; margin: 0; border-color: var(--green-800); background: rgba(255,255,255,.06); }
body:not([data-ad-demo="true"]) #adAnchor.is-empty { display: none; }
body:not([data-ad-demo="true"]) #adAnchor:has(.ad-slot.is-empty) { display: none; }
body[data-ad-demo="true"] #adAnchor .ad-slot::after { color: var(--green-200); }
#adAnchor .ad-close {
  position: absolute; right: 10px; top: 4px; background: rgba(255,255,255,.18); color: #fff;
  border: none; border-radius: 6px; width: 22px; height: 22px; cursor: pointer; font-size: 13px; line-height: 1;
}

/* Interstitial (full-screen). Hidden until triggered AND filled. */
#adInterstitial {
  position: fixed; inset: 0; z-index: 60; display: none;
  align-items: center; justify-content: center;
  background: rgba(8, 22, 14, .72); backdrop-filter: blur(3px);
}
#adInterstitial.is-open { display: flex; }
#adInterstitial .inter-box {
  background: var(--paper); border-radius: var(--radius); padding: 18px;
  max-width: 360px; width: calc(100% - 40px); text-align: center; box-shadow: var(--shadow-lg);
}
#adInterstitial .ad-slot { min-height: 250px; }
#adInterstitial .inter-continue {
  margin-top: 14px;
}

/* Back to top: fixed, 100px from viewport bottom. */
#backToTop {
  position: fixed; right: 20px; bottom: 100px; z-index: 38;
  width: 48px; height: 48px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--green-700); color: #fff; font-size: 20px; box-shadow: var(--shadow-lg);
  opacity: 0; transform: translateY(12px); pointer-events: none; transition: opacity .2s ease, transform .2s ease;
}
#backToTop.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
#backToTop:hover { background: var(--green-800); }

/* ---------- Legal pages ---------- */
.legal { max-width: 820px; margin: 0 auto; }
.legal h2 { margin-top: 34px; color: var(--green-800); }
.legal p, .legal li { color: #1c2b24; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .cat-grid, .recipe-grid, .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: flex-start; gap: 0; padding: 8px 20px 16px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 12px 0; width: 100%; }
  .nav-toggle { display: flex; }
  .stats { grid-template-columns: 1fr 1fr; }
  .cat-grid, .recipe-grid, .related-grid { grid-template-columns: 1fr; }
  .section { padding: 40px 0; }
  #backToTop { bottom: 20px; }

  /* Mobile footer: centered brand intro, two tidy link columns, big tap targets */
  .site-footer { padding: 36px 0 26px; }
  .footer-brand { text-align: center; padding-bottom: 20px; margin-bottom: 22px; }
  .footer-brand .foot-note { margin-left: auto; margin-right: auto; }
  .footer-brand .cookie-note { text-align: left; }
  .footer-grid--two { gap: 20px 14px; }
  .site-footer h4 { margin-bottom: 6px; }
  .site-footer ul { gap: 0; }
  .site-footer li a { display: block; padding: 10px 0; font-size: .95rem; }
  .footer-bottom { text-align: center; }
}