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

html {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  color: var(--fg-primary);
  background: var(--bg-app);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body { min-height: 100vh; }

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: var(--fw-semibold) var(--fs-body-sm)/1 var(--font-sans);
  padding: 14px 22px;
  border-radius: var(--radius-pill);
  border: 0;
  cursor: pointer;
  transition:
    transform var(--dur-fast) var(--ease-out-soft),
    background var(--dur-base) var(--ease-out-soft),
    opacity var(--dur-base) var(--ease-out-soft);
}
.btn:active { transform: scale(0.97); }

.btn-primary { background: var(--accent); color: var(--ink-1000); font-weight: var(--fw-bold); }
.btn-primary:hover { background: var(--accent-hover); }

.btn-dark { background: var(--ink-1000); color: var(--ink-000); }
.btn-dark:hover { opacity: 0.88; }

.btn-ghost { background: transparent; color: var(--fg-primary); border: 1px solid var(--border-strong); }
.btn-ghost:hover { background: var(--ink-050); }

/* ── Desktop nav ── */
.site-nav--desktop {
  position: sticky; top: 0; z-index: 30;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ink-200);
  padding: 18px 48px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-wordmark {
  display: inline-flex; align-items: center; gap: 8px;
  font: var(--fw-bold) 22px/1 var(--font-sans);
  letter-spacing: -0.01em;
  color: var(--ink-1000);
}

.nav-links {
  display: flex; align-items: center; gap: 32px;
}

.nav-links a {
  font: var(--fw-medium) 14px/1 var(--font-sans);
  color: var(--fg-body);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out-soft);
}
.nav-links a:hover { color: var(--ink-1000); }

.nav-btn-login {
  background: transparent;
  color: var(--ink-1000);
  border: 0;
  font: var(--fw-medium) 14px/1 var(--font-sans);
  cursor: pointer;
}
.nav-btn-login:hover { opacity: 0.7; }

.nav-btn-signup {
  background: var(--ink-1000);
  color: #fff;
  border: 0;
  padding: 12px 22px;
  border-radius: 9999px;
  font: var(--fw-semibold) 14px/1 var(--font-sans);
  cursor: pointer;
  transition: opacity 0.2s;
}
.nav-btn-signup:hover { opacity: 0.85; }

/* ── Mobile header ── */
.app-header--mobile {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1040;
  background: rgba(255,255,255,0.98);
  border-bottom: 1px solid rgba(0,0,0,0.07);
  transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

.app-header--mobile.scrolled {
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(0,0,0,0.04);
}

/* Logo row — centered, 48px tall */
.app-header__logo-row {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 16px;
  position: relative;
}

.mob-wordmark {
  display: inline-flex; align-items: center; gap: 8px;
  font: var(--fw-bold) 26px/1 var(--font-sans);
  letter-spacing: -0.01em;
  color: var(--ink-1000);
}

/* Nav row — icons spread across full width, 44px tall */
.app-header__nav {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 44px;
  padding: 0 8px;
  border-top: 1px solid rgba(0,0,0,0.05);
  max-width: 480px;
  margin: 0 auto;
  width: 100%;
}

.app-nav-item {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  height: 44px;
  color: #9ca3af;
  text-decoration: none;
  transition: color 0.15s;
  position: relative;
}
.app-nav-item:hover { color: #374151; }
.app-nav-item.active { color: var(--accent, #1ED760); }
.app-nav-item svg { width: 24px; height: 24px; display: block; }

/* ── Responsive switch ── */
@media (max-width: 768px) {
  .site-nav--desktop { display: none; }
  .app-header--mobile { display: block; }
  body { padding-top: 94px; }
}

/* ── Footer ── */
.site-footer {
  padding: 16px;
}

.footer-inner {
  background: var(--bg-app, #F1F1F1);
  border-radius: 28px;
  padding: 60px 48px 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font: var(--fw-bold) 22px/1 var(--font-sans);
  letter-spacing: var(--tracking-tight);
  color: var(--ink-1000);
  margin-bottom: 16px;
}

.footer-wordmark .wordmark-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-1000);
}

.footer-tagline {
  font-size: var(--fs-body-sm, 14px);
  color: var(--fg-muted);
  line-height: 1.55;
  margin-bottom: 24px;
}

.footer-copy {
  font-size: 12px;
  color: var(--fg-muted);
}

.footer-col-heading {
  font: var(--fw-semibold) 11px/1 var(--font-sans);
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col ul a {
  font-size: var(--fs-body-sm, 14px);
  color: var(--fg-body);
  transition: color var(--dur-fast, 120ms) ease;
}

.footer-col ul a:hover {
  color: var(--ink-1000);
}

@media (max-width: 900px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    padding: 48px 32px 36px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 540px) {
  .footer-inner {
    grid-template-columns: 1fr;
    padding: 40px 24px 32px;
    gap: 32px;
  }

  .site-footer {
    padding: 12px;
  }
}