/* ShelvesHub landing page — theme-aware, responsive, self-contained.
   Light palette on :root; dark overrides under prefers-color-scheme. */
:root {
  --bg: #f6f7f9;
  --bg-elev: #ffffff;
  --fg: #10151c;
  --fg-dim: #55606e;
  --accent: #1a9fff;
  --accent-2: #7c5cff;
  --border: rgba(16, 21, 28, 0.10);
  --card-shadow: 0 1px 3px rgba(16, 21, 28, 0.08), 0 8px 24px rgba(16, 21, 28, 0.06);
  --radius: 12px;
  --maxw: 960px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0f14;
    --bg-elev: #141a22;
    --fg: #eef2f6;
    --fg-dim: #9aa7b4;
    --border: rgba(255, 255, 255, 0.10);
    --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
img { max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Hero */
.hero {
  text-align: center;
  padding: 72px 20px 56px;
  background: radial-gradient(1200px 400px at 50% -10%, rgba(26, 159, 255, 0.14), transparent 70%);
}
.hero img.logo { width: 96px; height: 96px; }
.hero h1 { font-size: 2.4rem; margin: 18px 0 6px; letter-spacing: -0.02em; }
.hero .tagline { font-size: 1.15rem; color: var(--fg-dim); margin: 0 auto 8px; max-width: 640px; }
.hero .sub { color: var(--fg-dim); font-size: 0.95rem; }
.badges { margin: 22px 0 6px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.cta { margin-top: 26px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 10px; font-weight: 600;
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--fg);
}
.btn svg { width: 16px; height: 16px; flex: 0 0 auto; }
.btn.primary { background: var(--accent); border-color: transparent; color: #fff; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }

/* Sections */
section { padding: 48px 0; border-top: 1px solid var(--border); }
section h2 { font-size: 1.6rem; margin: 0 0 6px; letter-spacing: -0.01em; }
section .lead { color: var(--fg-dim); margin: 0 0 28px; max-width: 680px; }

/* Feature grid */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--card-shadow);
}
.card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--fg-dim); font-size: 0.95rem; }
.card-head { display: flex; align-items: center; gap: 10px; margin: 0 0 8px; }
.card-head svg { width: 22px; height: 22px; flex: 0 0 auto; color: var(--accent); }
.card-head h3 { margin: 0; }

/* Screenshot gallery */
.shots { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.shot { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--card-shadow); cursor: zoom-in; transition: transform .12s ease, box-shadow .12s ease; }
.shot:hover, .shot:focus-visible { transform: translateY(-2px); box-shadow: 0 2px 6px rgba(16,21,28,.12), 0 14px 34px rgba(16,21,28,.12); outline: none; }
/* The panels are portrait — show the WHOLE image (contain), never crop. */
.shot img { display: block; width: 100%; height: 300px; object-fit: contain; background: var(--bg); }
.shot .cap { padding: 10px 14px; font-size: 0.9rem; color: var(--fg-dim); }
.shots-empty { color: var(--fg-dim); font-size: 0.95rem; border: 1px dashed var(--border); border-radius: var(--radius); padding: 22px; text-align: center; }

/* Lightbox — click a screenshot to view it full-size */
.lightbox { position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center; padding: 4vmin; background: rgba(4, 6, 10, 0.88); cursor: zoom-out; overflow: auto; }
.lightbox[hidden] { display: none; }
.lightbox img { max-width: 100%; max-height: 92vh; object-fit: contain; border-radius: 10px; box-shadow: 0 12px 48px rgba(0, 0, 0, 0.55); }
.lightbox .lb-close { position: fixed; top: 16px; right: 20px; width: 40px; height: 40px; border: none; border-radius: 50%; background: rgba(255, 255, 255, 0.14); color: #fff; font-size: 22px; line-height: 1; cursor: pointer; }
.lightbox .lb-close:hover { background: rgba(255, 255, 255, 0.26); }

/* Steps */
.steps { counter-reset: step; display: grid; gap: 12px; }
.step { display: flex; gap: 14px; align-items: flex-start; }
.step::before {
  counter-increment: step; content: counter(step);
  flex: 0 0 auto; width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700; display: grid; place-items: center; font-size: 0.9rem;
}
.step code { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; }

/* FAQ */
.faq details { border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; margin-bottom: 10px; background: var(--bg-elev); }
.faq summary { font-weight: 600; cursor: pointer; }
.faq p { color: var(--fg-dim); margin: 10px 0 0; }

footer { border-top: 1px solid var(--border); padding: 32px 0 56px; color: var(--fg-dim); font-size: 0.9rem; text-align: center; }