/* ============================================================
   SIGNA — landing.css · index.html styles
   Sticky nav · hero · bento grid · how it works · CTA · footer
   ============================================================ */
.landing { background: var(--bg); }
.landing .wrap { max-width: var(--content-max); margin: 0 auto; padding: 0 var(--space-6); }
@media (max-width: 767px) { .landing .wrap { padding: 0 var(--space-4); } }

/* ---------- Nav ---------- */
.landing-nav {
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background 300ms, border-color 300ms, backdrop-filter 300ms;
}
.landing-nav.is-scrolled {
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px); border-bottom-color: var(--border);
}
.landing-nav__inner { display: flex; align-items: center; gap: var(--space-4); height: 68px; }
.landing-nav__links { display: flex; gap: 6px; margin-left: auto; }
.landing-nav__links a { padding: 9px 14px; border-radius: var(--radius-full); color: var(--text-secondary); font-weight: 500; font-size: 15px; }
.landing-nav__links a:hover { color: var(--text-primary); background: var(--surface-elevated); text-decoration: none; }
@media (max-width: 640px) { .landing-nav__links { display: none; } .landing-nav .btn { margin-left: auto; } }

/* ---------- Hero ---------- */
.hero { padding: var(--space-16) 0 var(--space-12); position: relative; overflow: hidden; }
.hero__grid { display: grid; grid-template-columns: 1.02fr 0.98fr; gap: var(--space-12); align-items: center; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent-soft); color: var(--accent);
  border: 1px solid var(--accent-border);
  padding: 6px 13px; border-radius: var(--radius-full);
  font-size: 13px; font-weight: 600; margin-bottom: var(--space-5);
}
html[data-theme="light"] .hero__eyebrow { color: var(--accent); }
.hero__eyebrow svg { width: 15px; height: 15px; }
.hero h1 { font-family: var(--font-display); font-weight: 800; font-size: clamp(36px, 5.4vw, 56px); line-height: 1.05; letter-spacing: -0.015em; }
.hero h1 .hl { color: var(--accent); }
.hero h1 .hl2 { color: var(--accent-2); }
.hero__sub { font-size: clamp(16px, 2vw, 19px); color: var(--text-secondary); margin: var(--space-5) 0 var(--space-8); max-width: 520px; }
.hero__note { font-size: 14px; color: var(--text-muted); margin-top: var(--space-3); display: flex; align-items: center; gap: 7px; }
.hero__note svg { width: 15px; height: 15px; color: var(--success); }
.hero__proof { display: flex; gap: var(--space-8); margin-top: var(--space-8); flex-wrap: wrap; }
.hero__proof .stat-value { font-size: 24px; }

/* Mockup */
.mockup {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg); padding: var(--space-4); display: grid; gap: var(--space-3);
  transform: rotate(0.4deg);
}
.mockup__bar { display: flex; align-items: center; gap: 7px; padding: 2px 4px 6px; }
.mockup__dot { width: 11px; height: 11px; border-radius: 50%; }
.mockup__url { margin-left: 8px; flex: 1; background: var(--surface-elevated); border-radius: var(--radius-full); font-size: 12px; color: var(--text-muted); padding: 5px 12px; font-family: var(--font-mono); }
.mockup__body { display: grid; grid-template-columns: 1.5fr 1fr; gap: var(--space-3); }
.mockup__cam {
  position: relative; border-radius: var(--radius-lg); background: var(--camera-bg);
  aspect-ratio: 4/3.4; overflow: hidden; display: grid; place-items: center;
}
.mockup__side { display: grid; gap: var(--space-3); align-content: start; }
.mockup__mini { background: var(--surface-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: var(--space-3); }

/* ---------- Bento ---------- */
.section { padding: var(--space-16) 0; }
.section__head { max-width: 680px; margin-bottom: var(--space-8); }
.section__head p { color: var(--text-secondary); margin-top: var(--space-3); font-size: 17px; }
.bento { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.bento .card { display: grid; gap: var(--space-4); align-content: start; overflow: hidden; }
.bento .span-2 { grid-column: span 2; }
.bento h3 { display: flex; align-items: center; gap: 9px; }
.bento h3 svg { width: 21px; height: 21px; color: var(--accent); }
.bento .card p { color: var(--text-secondary); font-size: 14.5px; }
.bento__visual { background: var(--surface-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: var(--space-4); }
.alpha-strip { display: flex; flex-wrap: wrap; gap: 5px; }
.alpha-strip span {
  font-family: var(--font-mono); font-weight: 700; font-size: 12.5px;
  width: 30px; height: 30px; display: grid; place-items: center;
  border-radius: 8px; background: var(--surface); border: 1px solid var(--border);
}
.alpha-strip span.done { background: var(--success); color: var(--on-accent); border-color: var(--success); }
.alpha-strip span.doing { background: var(--warning); color: #fff; border-color: var(--warning); }
.mastery-bars { display: grid; gap: 8px; }

/* ---------- How it works ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.step-card { text-align: left; }
.step-card__num {
  width: 52px; height: 52px; border-radius: var(--radius-md);
  display: grid; place-items: center; margin-bottom: var(--space-4);
  background: var(--accent-soft); color: var(--accent);
}
.step-card__num svg { width: 26px; height: 26px; }
.step-card h3 { margin-bottom: 8px; }
.step-card p { color: var(--text-secondary); font-size: 15px; }

/* ---------- Final CTA / footer ---------- */
.final-cta { text-align: center; padding: var(--space-16) 0; }
.final-cta .card { padding: var(--space-12) var(--space-6); display: grid; justify-items: center; gap: var(--space-4); }
.landing-footer { text-align: center; padding: var(--space-12) 0 var(--space-8); display: grid; justify-items: center; gap: 8px; color: var(--text-secondary); font-size: 14px; }

/* ---------- Responsive ---------- */
@media (max-width: 1023px) {
  .bento { grid-template-columns: 1fr 1fr; }
  .bento .span-2 { grid-column: span 2; }
}
@media (max-width: 767px) {
  .hero { padding-top: var(--space-8); }
  .hero__grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .mockup__body { grid-template-columns: 1fr; }
  .bento, .steps { grid-template-columns: 1fr; }
  .bento .span-2 { grid-column: auto; }
  .section { padding: var(--space-12) 0; }
}


/* Small-screen landing fit: nav and hero CTA never clip or wrap awkwardly. */
.bento > *, .steps > *, .hero__grid > * { min-width: 0; }

@media (max-width: 767px) {
  .hero .btn-lg { width: min(100%, 420px); white-space: nowrap; font-size: 15px; padding-inline: 16px; }
  .hero__eyebrow { line-height: 1.35; }
}

@media (max-width: 640px) {
  .landing-nav__inner { gap: 10px; }
  .landing-nav .theme-toggle-slot { margin-left: auto; }
  .landing-nav .btn { margin-left: 0; padding: 9px 13px; font-size: 14px; white-space: nowrap; min-height: 44px; }
  .landing .logo { font-size: 19px; }
  .landing .logo__mark { width: 34px; height: 34px; }
}

@media (max-width: 380px) {
  .landing .wrap { padding: 0 14px; }
  .landing-nav__inner { gap: 8px; }
  .landing .logo { gap: 7px; font-size: 18px; }
  .landing .logo__mark { width: 32px; height: 32px; border-radius: 10px; }
  .landing-nav .btn { padding: 8px 11px; font-size: 13.5px; }
  .hero h1 { font-size: 34px; }
}