/* Apnea Freediving Exercises: site-wide styles.
   Dark ocean theme built around the app's own UI colours. */

:root {
  --bg: #051422;
  --bg-raised: #0a2236;
  --bg-card: #0d2a42;
  --line: #1b3a55;
  --text: #e8f3fb;
  --muted: #a3bdd0;
  --accent: #35d3c0;
  --accent-2: #4db8ff;
  --accent-ink: #042420;
  --star: #ffc83d;
  --danger: #ff9d7a;
  --radius: 16px;
  --maxw: 1080px;
  font-size: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5, 20, 34, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }

.site-nav { margin-left: auto; display: flex; align-items: center; gap: 22px; }
.site-nav a { color: var(--muted); font-size: 0.95rem; font-weight: 500; }
.site-nav a:hover { color: var(--text); text-decoration: none; }
.site-nav a.btn-primary, .site-nav a.btn-primary:hover { color: var(--accent-ink); }
@media (max-width: 720px) { .site-nav a:not(.btn) { display: none; } }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.2;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-ink);
  box-shadow: 0 8px 24px rgba(53, 211, 192, 0.35);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(53, 211, 192, 0.5); }

.btn-small { padding: 8px 18px; font-size: 0.9rem; }

.badge-link { display: inline-block; }
.badge-link img { height: 54px; width: auto; }

.free-note { font-size: 0.85rem; color: var(--muted); margin-top: 10px; }

/* ---------- Hero ---------- */

.hero { padding: 72px 0 40px; overflow: hidden; }
.hero .wrap {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-visual { order: 2; margin: 0 auto; }
}

.rating-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 22px;
}
.rating-pill .stars { color: var(--star); letter-spacing: 2px; }

.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}
.hero h1 .accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .lead {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 46ch;
  margin-bottom: 28px;
}

.hero-ctas { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; }

.hero-proof { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 22px; }
.proof-item { font-size: 0.9rem; color: var(--muted); }
.proof-item strong { display: block; color: var(--text); font-size: 1.25rem; }

.hero-visual { position: relative; width: min(300px, 78vw); }
.phone {
  border-radius: 40px;
  border: 6px solid #10314b;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(77, 184, 255, 0.15);
  overflow: hidden;
  background: #071c2e;
}
.phone img { width: 100%; }

/* ---------- Sections ---------- */

section { padding: 72px 0; }
section.tint { background: var(--bg-raised); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 10px;
}

h2.section-title {
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.section-intro { color: var(--muted); max-width: 62ch; margin-bottom: 40px; }

/* ---------- Screenshot gallery ---------- */

.gallery {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 220px;
  gap: 20px;
  overflow-x: auto;
  padding: 10px 4px 24px;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--line) transparent;
}
.gallery figure { scroll-snap-align: start; }
.gallery img {
  border-radius: 22px;
  border: 1px solid var(--line);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.4);
}
.gallery figcaption {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 10px;
  text-align: center;
}

/* ---------- How it works ---------- */

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr; } }

.step {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-ink);
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 16px;
}
.step h3 { font-size: 1.15rem; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 0.95rem; }

.feature-list {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px 28px;
  list-style: none;
}
@media (max-width: 820px) { .feature-list { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .feature-list { grid-template-columns: 1fr; } }
.feature-list li { color: var(--muted); font-size: 0.95rem; padding-left: 28px; position: relative; }
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(53, 211, 192, 0.18);
  border: 1.5px solid var(--accent);
}

/* ---------- Testimonials ---------- */

.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 820px) { .quotes { grid-template-columns: 1fr; } }
.quote {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.quote .stars { color: var(--star); letter-spacing: 2px; font-size: 0.95rem; }
.quote blockquote { font-size: 0.98rem; color: var(--text); }
.quote cite { color: var(--muted); font-size: 0.85rem; font-style: normal; }

/* ---------- Guide cards ---------- */

.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
@media (max-width: 720px) { .guide-grid { grid-template-columns: 1fr; } }

.guide-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  color: var(--text);
  display: block;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.guide-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.guide-card .tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 10px;
}
.guide-card h3 { font-size: 1.12rem; margin-bottom: 8px; }
.guide-card p { color: var(--muted); font-size: 0.92rem; }
.guide-card .more { display: inline-block; margin-top: 14px; font-weight: 600; color: var(--accent-2); font-size: 0.9rem; }

/* ---------- FAQ ---------- */

.faq-list { display: grid; gap: 14px; max-width: 820px; }

.faq-list details {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0 22px;
}
.faq-list details[open] { border-color: var(--accent); }

.faq-list summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 1.02rem;
  padding: 18px 34px 18px 0;
  position: relative;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--accent);
}
.faq-list details[open] summary::after { content: "\2212"; }

.faq-list .answer { padding: 0 0 20px; color: var(--muted); font-size: 0.96rem; }
.faq-list .answer a { font-weight: 600; }

/* ---------- CTA band ---------- */

.cta-band {
  background: linear-gradient(135deg, rgba(53, 211, 192, 0.14), rgba(77, 184, 255, 0.14));
  border: 1px solid rgba(53, 211, 192, 0.35);
  border-radius: 24px;
  padding: 56px 40px;
  text-align: center;
}
.cta-band h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); margin-bottom: 12px; }
.cta-band p { color: var(--muted); max-width: 52ch; margin: 0 auto 28px; }
.cta-band .hero-ctas { justify-content: center; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 40px;
  font-size: 0.9rem;
  color: var(--muted);
}
.footer-cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
@media (max-width: 720px) { .footer-cols { grid-template-columns: 1fr; } }
.site-footer h3 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text); margin-bottom: 14px; }
.site-footer ul { list-style: none; display: grid; gap: 8px; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }
.footer-note { border-top: 1px solid var(--line); padding-top: 24px; font-size: 0.8rem; }

/* ---------- Guide article pages ---------- */

.article-header { padding: 56px 0 8px; }
.breadcrumbs { font-size: 0.85rem; color: var(--muted); margin-bottom: 18px; }
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--accent); }

article.guide { max-width: 760px; margin: 0 auto; padding: 0 20px 72px; }
article.guide h1 { font-size: clamp(1.9rem, 4.4vw, 2.7rem); line-height: 1.15; letter-spacing: -0.02em; margin-bottom: 14px; }
article.guide .meta { color: var(--muted); font-size: 0.88rem; margin-bottom: 34px; }
article.guide h2 { font-size: 1.5rem; margin: 44px 0 14px; letter-spacing: -0.01em; }
article.guide h3 { font-size: 1.15rem; margin: 30px 0 10px; }
article.guide p { margin-bottom: 16px; color: #cfe0ec; }
article.guide ul, article.guide ol { margin: 0 0 18px 24px; color: #cfe0ec; }
article.guide li { margin-bottom: 8px; }
article.guide strong { color: var(--text); }

article.guide table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0 26px;
  font-size: 0.92rem;
}
article.guide th, article.guide td {
  border: 1px solid var(--line);
  padding: 10px 14px;
  text-align: left;
}
article.guide th { background: var(--bg-card); color: var(--text); }
article.guide td { color: #cfe0ec; }

.app-callout {
  background: var(--bg-card);
  border: 1px solid rgba(53, 211, 192, 0.4);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  padding: 22px 24px;
  margin: 28px 0;
}
.app-callout .callout-label {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 8px;
}
.app-callout p:last-child { margin-bottom: 0; }

.safety-callout {
  background: rgba(255, 157, 122, 0.08);
  border: 1px solid rgba(255, 157, 122, 0.45);
  border-left: 4px solid var(--danger);
  border-radius: 12px;
  padding: 22px 24px;
  margin: 28px 0;
}
.safety-callout .callout-label {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--danger);
  margin-bottom: 8px;
}
.safety-callout p { color: #f3d9cd; }
.safety-callout p:last-child { margin-bottom: 0; }

.article-cta {
  background: linear-gradient(135deg, rgba(53, 211, 192, 0.14), rgba(77, 184, 255, 0.14));
  border: 1px solid rgba(53, 211, 192, 0.35);
  border-radius: 18px;
  padding: 34px 30px;
  text-align: center;
  margin: 44px 0;
}
.article-cta h2 { margin-top: 0 !important; }
.article-cta p { color: var(--muted); }
.article-cta .hero-ctas { justify-content: center; margin-top: 18px; }

.related { border-top: 1px solid var(--line); margin-top: 48px; padding-top: 32px; }
.related h2 { font-size: 1.2rem; margin: 0 0 18px; }
.related ul { list-style: none; margin: 0; display: grid; gap: 10px; }
.related a { font-weight: 600; }

.guide-screenshot {
  width: min(280px, 80%);
  margin: 28px auto;
  border-radius: 22px;
  border: 1px solid var(--line);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.4);
}