/* ============================================================
   Backpack Guide — Independent review & referral hub
   Shared design system (palette inspired by backpack.exchange)
   ============================================================ */

:root {
  --bg: #0E0F14;
  --surface: #14151B;
  --surface-2: #191A20;
  --surface-3: #202127;
  --border: #24262F;
  --border-2: #2E313C;
  --text: #F4F4F6;
  --muted: #969FAF;
  --muted-2: #6E7686;
  --accent: #00C278;      /* Backpack "Buy" green */
  --accent-hover: #00D986;
  --accent-ink: #06251A;  /* text on accent */
  --danger: #F6465D;
  --warn: #F0B90B;
  --radius: 14px;
  --radius-sm: 10px;
  --maxw: 1080px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

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

/* ---------- Affiliate disclosure bar ---------- */
.disclosure {
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
  padding: 7px 16px;
}
.disclosure strong { color: var(--text); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(14,15,20,.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 62px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  color: var(--text);
  font-size: 17px;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #0aa1a0);
  display: grid; place-items: center;
  color: var(--accent-ink); font-weight: 900; font-size: 15px;
}
.brand .tag {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted-2);
  border: 1px solid var(--border-2);
  border-radius: 999px;
  padding: 1px 7px;
}
.nav-links {
  display: flex;
  gap: 16px;
  margin-left: 8px;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--muted);
  font-size: 14.5px;
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-spacer { flex: 1; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 700;
  font-size: 15px;
  border-radius: 999px;
  padding: 11px 20px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-2);
}
.btn-ghost:hover { border-color: var(--muted); }
.btn-lg { font-size: 17px; padding: 15px 30px; }
.btn-block { display: flex; width: 100%; }

/* ---------- Sticky mobile CTA (top) ---------- */
.mobile-cta {
  display: none;
  position: sticky;
  top: 62px;
  z-index: 40;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
}

/* ---------- Sections ---------- */
section { padding: 54px 0; }
.section-tight { padding: 34px 0; }

h1 {
  font-size: clamp(30px, 5.5vw, 50px);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: 0 0 16px;
  font-weight: 800;
}
h2 {
  font-size: clamp(23px, 3.5vw, 32px);
  letter-spacing: -.015em;
  margin: 0 0 18px;
  font-weight: 750;
}
h3 { font-size: 20px; margin: 28px 0 10px; font-weight: 700; }
p { margin: 0 0 16px; color: #DADDE6; }
.lead { font-size: 19px; color: var(--muted); }
.muted { color: var(--muted); }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 12px;
}

/* ---------- Hero ---------- */
.hero {
  padding: 60px 0 48px;
  background:
    radial-gradient(900px 400px at 78% -10%, rgba(0,194,120,.10), transparent 60%),
    var(--bg);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr .95fr;
  gap: 44px;
  align-items: center;
}
.hero-cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 24px 0 14px; }
.hero-note { font-size: 13.5px; color: var(--muted-2); }

/* rating card */
.rating-card {
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}
.rating-score {
  font-size: 52px; font-weight: 800; line-height: 1;
  display: flex; align-items: baseline; gap: 6px;
}
.rating-score span { font-size: 22px; color: var(--muted); font-weight: 600; }
.stars { color: var(--accent); font-size: 20px; letter-spacing: 2px; margin: 8px 0 4px; }
.rating-list { list-style: none; padding: 0; margin: 18px 0 0; }
.rating-list li {
  display: flex; justify-content: space-between;
  padding: 9px 0; border-top: 1px solid var(--border);
  font-size: 14.5px; color: var(--muted);
}
.rating-list li b { color: var(--text); font-weight: 600; }

/* ---------- Cards / grid ---------- */
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }

/* pros / cons */
.proscons { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.pc { border-radius: var(--radius); padding: 22px; border: 1px solid var(--border); }
.pc.pros { background: rgba(0,194,120,.06); border-color: rgba(0,194,120,.25); }
.pc.cons { background: rgba(246,70,93,.05); border-color: rgba(246,70,93,.22); }
.pc h3 { margin-top: 0; }
.pc ul { list-style: none; padding: 0; margin: 0; }
.pc li { position: relative; padding: 7px 0 7px 26px; color: #DADDE6; font-size: 15.5px; }
.pc.pros li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 800; }
.pc.cons li::before { content: "✕"; position: absolute; left: 0; color: var(--danger); font-weight: 800; }

/* steps */
.steps { counter-reset: step; display: grid; gap: 14px; }
.step {
  display: grid; grid-template-columns: 44px 1fr; gap: 16px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}
.step .num {
  counter-increment: step;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--surface-3); color: var(--accent);
  display: grid; place-items: center; font-weight: 800; font-size: 18px;
}
.step .num::before { content: counter(step); }
.step h3 { margin: 0 0 6px; }
.step p { margin: 0; }

/* table */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 520px; }
th, td { text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--border); }
th { background: var(--surface-2); color: var(--muted); font-weight: 600; font-size: 13.5px; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: none; }
td b { color: var(--text); }
.hl { color: var(--accent); font-weight: 700; }

/* callout */
.callout {
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  margin: 24px 0;
  font-size: 15.5px;
}
.callout.warn { border-left-color: var(--warn); }

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, rgba(0,194,120,.12), rgba(0,194,120,.02));
  border: 1px solid rgba(0,194,120,.28);
  border-radius: var(--radius);
  padding: 38px;
  text-align: center;
}
.cta-band h2 { margin-bottom: 8px; }
.cta-band p { color: var(--muted); max-width: 620px; margin: 0 auto 22px; }

/* FAQ */
.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  padding: 4px 20px;
  margin-bottom: 12px;
}
.faq summary {
  cursor: pointer;
  font-weight: 650;
  font-size: 17px;
  padding: 15px 0;
  list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 22px; font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq details[open] summary { border-bottom: 1px solid var(--border); }
.faq details > p { padding: 14px 0 6px; margin: 0; color: var(--muted); }

/* breadcrumb */
.crumbs { font-size: 13px; color: var(--muted-2); padding: 18px 0 0; }
.crumbs a { color: var(--muted); }

/* related links */
.related { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
.related a {
  display: block; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 16px 18px; color: var(--text); font-weight: 600;
}
.related a:hover { border-color: var(--border-2); text-decoration: none; }
.related a span { display: block; font-size: 13px; color: var(--muted); font-weight: 400; margin-top: 3px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 40px 0 30px;
  margin-top: 20px;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 30px; }
.footer-grid h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted-2); margin: 0 0 12px; }
.footer-grid a { display: block; color: var(--muted); font-size: 14.5px; padding: 4px 0; }
.footer-grid a:hover { color: var(--text); text-decoration: none; }
.footer-disclaimer {
  margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--border);
  font-size: 12.5px; color: var(--muted-2); line-height: 1.6;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  body { font-size: 16px; }
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .grid-3, .grid-2, .proscons, .related, .footer-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .mobile-cta { display: block; }   /* prominent top button on mobile */
  section { padding: 40px 0; }
  .cta-band { padding: 28px 20px; }
}
@media (min-width: 861px) {
  .header-cta { display: inline-flex; }
}