/* ============================================================
   CalculFit — Layout CSS
   Header · Footer · Navigation · Hero
   ============================================================ */

/* ─── Header ───────────────────────────────────────────────── */
#site-header {
  position: sticky; top: 0; z-index: 1000;
  height: var(--header-h);
  background: rgba(247,249,248,.88);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(0,0,0,.06);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}
#site-header.scrolled { box-shadow: var(--shadow-md); }

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex; align-items: center; gap: .6rem;
  font-family: var(--font-head); font-size: 1.35rem; font-weight: 800;
  color: var(--clr-dark); text-decoration: none;
}
.logo:hover { color: var(--clr-dark); }
.logo svg { width: 36px; height: 36px; }
.logo span.accent { color: var(--clr-primary); }

/* Main Nav */
.main-nav { display: flex; align-items: center; gap: 0; }
.main-nav > li { position: relative; }

.nav-link {
  display: flex; align-items: center; gap: .3rem;
  padding: .5rem .9rem; font-size: .92rem; font-weight: 500;
  color: var(--clr-dark); border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-link:hover, .nav-link.active { color: var(--clr-primary); background: var(--clr-primary-light); }

/* Dropdown */
.nav-dropdown {
  position: absolute; top: calc(100% + .5rem); left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--clr-surface); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); border: 1px solid rgba(0,0,0,.06);
  min-width: 220px; padding: .5rem;
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.main-nav > li:hover .nav-dropdown {
  opacity: 1; pointer-events: all; transform: translateX(-50%) translateY(0);
}
.dropdown-item {
  display: flex; align-items: center; gap: .75rem;
  padding: .6rem .8rem; border-radius: var(--radius-md);
  font-size: .875rem; color: var(--clr-dark); font-weight: 500;
  transition: background var(--transition-fast);
}
.dropdown-item:hover { background: var(--clr-primary-light); color: var(--clr-primary-dark); }
.dropdown-item .di-icon { font-size: 1.1rem; }

/* CTA */
.header-cta { margin-left: var(--space-lg); }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  width: 36px; height: 36px; align-items: center; justify-content: center;
  border-radius: var(--radius-md); transition: background var(--transition-fast);
}
.hamburger:hover { background: var(--clr-primary-light); }
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--clr-dark); border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: none; position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0;
  background: var(--clr-surface); overflow-y: auto; z-index: 999;
  padding: var(--space-xl) var(--container-pad);
  transform: translateX(-100%); transition: transform var(--transition-base);
}
.mobile-menu.open { transform: translateX(0); }
.mobile-nav-link {
  display: flex; align-items: center; gap: .75rem;
  padding: .9rem 1rem; border-radius: var(--radius-md); font-size: 1rem;
  font-weight: 600; color: var(--clr-dark); border-bottom: 1px solid rgba(0,0,0,.05);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.mobile-nav-link:hover { background: var(--clr-primary-light); color: var(--clr-primary); }
.mobile-section-title {
  font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em;
  color: var(--clr-primary); padding: var(--space-lg) 1rem var(--space-sm);
}

@media (max-width: 900px) {
  .main-nav, .header-cta { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: block; }
}

/* ─── Hero ─────────────────────────────────────────────────── */
.hero {
  background: var(--grad-hero); position: relative; overflow: hidden;
  padding: calc(var(--header-h) + var(--space-4xl)) 0 var(--space-4xl);
  min-height: 100svh; display: flex; align-items: center;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 30%, rgba(45,189,143,.18) 0%, transparent 70%);
  pointer-events: none;
}
.hero-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  align-items: center; gap: var(--space-4xl);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .8rem; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--clr-primary);
  background: rgba(45,189,143,.12); border: 1px solid rgba(45,189,143,.25);
  padding: .4rem 1rem; border-radius: var(--radius-full); margin-bottom: var(--space-lg);
}
.hero h1 { color: #fff; margin-bottom: var(--space-lg); }
.hero h1 span { color: var(--clr-primary); }
.hero-sub { color: rgba(255,255,255,.7); font-size: 1.15rem; margin-bottom: var(--space-2xl); max-width: 480px; }
.hero-actions { display: flex; gap: var(--space-md); flex-wrap: wrap; align-items: center; }
.hero-stats {
  display: flex; gap: var(--space-xl); margin-top: var(--space-3xl);
  padding-top: var(--space-xl); border-top: 1px solid rgba(255,255,255,.1);
}
.hero-stat .num { font-family: var(--font-head); font-size: 2rem; font-weight: 800; color: #fff; }
.hero-stat .lbl { font-size: .82rem; color: rgba(255,255,255,.5); }

/* Hero right side — floating calc preview */
.hero-visual { position: relative; display: flex; align-items: center; justify-content: center; }
.hero-float {
  animation: float 4s ease-in-out infinite;
  filter: drop-shadow(0 24px 48px rgba(0,0,0,.4));
}
.hero-particle {
  position: absolute; border-radius: 50%;
  background: rgba(45,189,143,.25); animation: float 3s ease-in-out infinite;
}
.hero-particle:nth-child(1) { width: 60px; height: 60px; top: 10%; left: -5%; animation-delay: 0s; }
.hero-particle:nth-child(2) { width: 40px; height: 40px; bottom: 15%; right: -5%; animation-delay: 1.5s; }
.hero-particle:nth-child(3) { width: 20px; height: 20px; top: 50%; right: 5%; animation-delay: .8s; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero { min-height: auto; padding-block: var(--space-4xl); }
}

/* ─── Footer ───────────────────────────────────────────────── */
#site-footer {
  background: var(--clr-dark); color: rgba(255,255,255,.7);
  padding-top: var(--space-4xl); padding-bottom: var(--space-xl);
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}
.footer-brand .logo { color: #fff; margin-bottom: var(--space-md); }
.footer-brand p { font-size: .9rem; max-width: 280px; }
.footer-col h5 {
  color: #fff; font-size: .82rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .1em;
  margin-bottom: var(--space-lg);
}
.footer-col a {
  display: block; color: rgba(255,255,255,.6); font-size: .9rem;
  margin-bottom: .5rem; transition: color var(--transition-fast);
}
.footer-col a:hover { color: var(--clr-primary); }

.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: var(--space-xl); border-top: 1px solid rgba(255,255,255,.08);
  font-size: .82rem;
}
.footer-bottom-links { display: flex; gap: var(--space-lg); }
.footer-bottom-links a { color: rgba(255,255,255,.5); }
.footer-bottom-links a:hover { color: var(--clr-primary); }

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-md); text-align: center; }
}