/* CSS Variables (Design System) — matches extaddon 600-sound-volume theme */
:root {
  --color-primary: hsl(215, 100%, 50%);
  --color-primary-hover: hsl(215, 100%, 45%);
  --color-secondary: hsl(210, 29%, 17%);
  --color-accent: hsl(205, 100%, 51%);
  --color-purple: hsl(270, 60%, 60%);

  --color-background: hsl(210, 40%, 98%);
  --color-foreground: hsl(222, 47%, 11%);
  --color-muted: hsl(210, 40%, 96%);
  --color-muted-foreground: hsl(215, 16%, 47%);
  --color-border: hsl(214, 32%, 91%);

  --gradient-primary: linear-gradient(135deg, hsl(215, 100%, 50%) 0%, hsl(205, 100%, 55%) 100%);
  --gradient-accent: linear-gradient(135deg, hsl(205, 100%, 51%) 0%, hsl(215, 100%, 55%) 100%);
  --gradient-purple: linear-gradient(135deg, hsl(215, 100%, 50%) 0%, hsl(270, 60%, 60%) 100%);

  --shadow-sm: 0 2px 8px -2px hsl(215, 100%, 50%, 0.1);
  --shadow-md: 0 8px 24px -4px hsl(215, 100%, 50%, 0.15);
  --shadow-lg: 0 16px 48px -8px hsl(215, 100%, 50%, 0.2);

  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.25rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2.25rem;
  --spacing-3xl: 3rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 2.75rem;
  --font-size-6xl: 3.25rem;
  --font-size-7xl: 3.75rem;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: var(--font-family); font-size: var(--font-size-base); line-height: 1.5; color: var(--color-foreground); background-color: var(--color-background); }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; }

.container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 var(--spacing-md); }
.container-narrow { max-width: 900px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--spacing-xs); padding: 0.5rem 1rem; font-size: var(--font-size-sm); font-weight: 500; border-radius: var(--radius-md); border: none; transition: all var(--transition-base); white-space: nowrap; }
.btn-primary { background: var(--color-primary); color: white; }
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; color: var(--color-foreground); border: 1px solid var(--color-border); }
.btn-outline:hover { background: var(--color-accent); color: var(--color-secondary); border-color: var(--color-accent); }
.btn-sm { padding: 0.375rem 0.75rem; font-size: var(--font-size-sm); }
.btn-lg { padding: 0.625rem 1.5rem; font-size: var(--font-size-base); }
.btn-full { width: 100%; }
.btn-icon { gap: var(--spacing-sm); }
.btn-icon .icon-arrow { transition: transform var(--transition-base); }
.btn-primary:hover .icon-arrow { transform: translateX(4px); }

.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(252, 252, 253, 0.8); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--color-border); }
.nav-content { display: flex; align-items: center; justify-content: space-between; height: 3.25rem; }
.nav-logo { display: flex; align-items: center; gap: var(--spacing-sm); text-decoration: none; color: inherit; }
.nav-logo:hover { text-decoration: none; color: inherit; }
.nav-logo:hover .brand-mark--nav { transform: scale(1.04); }
.logo-text { font-size: var(--font-size-lg); font-weight: 700; color: var(--color-foreground); }

/* Extension icon (public/images/icon_512.png → site/icon/) */
.brand-mark { display: block; object-fit: contain; flex-shrink: 0; transition: transform var(--transition-base); }
.brand-mark--nav,
.brand-mark--footer { width: 2.25rem; height: 2.25rem; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
.brand-mark--hero { width: clamp(3rem, 10vw, 4.75rem); height: clamp(3rem, 10vw, 4.75rem); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.brand-mark--contact { width: 3.5rem; height: 3.5rem; border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }

.hero-title-row { display: flex; align-items: flex-start; gap: var(--spacing-md); }
.hero-title-row .hero-title { margin: 0; flex: 1; min-width: 0; }
.contact-card__mark { display: flex; justify-content: center; margin-bottom: var(--spacing-md); }
.nav-links { display: flex; align-items: center; gap: var(--spacing-lg); }
.nav-link { font-size: var(--font-size-sm); font-weight: 500; color: var(--color-muted-foreground); transition: color var(--transition-base); }
.nav-link:hover { color: var(--color-foreground); }
.nav-toggle { display: none; background: transparent; border: none; color: var(--color-foreground); }

.hero { padding: 5.5rem var(--spacing-md) 2.75rem; background: linear-gradient(180deg, var(--color-background) 0%, var(--color-muted) 100%); }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: var(--spacing-2xl); align-items: center; }
.hero-content { display: flex; flex-direction: column; gap: var(--spacing-lg); }
.badge { display: inline-block; width: fit-content; padding: var(--spacing-sm) var(--spacing-md); background: rgba(0, 120, 255, 0.1); color: var(--color-primary); border-radius: var(--radius-full); font-size: var(--font-size-sm); font-weight: 500; }
.hero-title { font-size: var(--font-size-4xl); font-weight: 700; line-height: 1.12; color: var(--color-foreground); }
.gradient-text { background: var(--gradient-purple); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-description { font-size: var(--font-size-lg); line-height: 1.55; color: var(--color-muted-foreground); max-width: 38rem; }
.hero-buttons { display: flex; flex-wrap: wrap; gap: var(--spacing-md); }
.hero-image { position: relative; }
.hero-image-glow { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(0, 120, 255, 0.2) 0%, rgba(147, 51, 234, 0.2) 100%); border-radius: var(--radius-xl); filter: blur(48px); }
.hero-image img { position: relative; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); }

.section { padding: 3.25rem var(--spacing-md); }
.section-header { text-align: center; margin-bottom: var(--spacing-2xl); }
.section-title { font-size: var(--font-size-3xl); font-weight: 700; color: var(--color-foreground); margin-bottom: var(--spacing-sm); }
.section-description { font-size: var(--font-size-lg); color: var(--color-muted-foreground); max-width: 38rem; margin: 0 auto; line-height: 1.5; }

.card { background: white; border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); transition: all var(--transition-base); }

.features { background: var(--color-background); }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: var(--spacing-lg); }
.feature-card { padding: var(--spacing-lg); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-icon { width: 3rem; height: 3rem; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, rgba(0, 120, 255, 0.2) 0%, rgba(147, 51, 234, 0.2) 100%); border-radius: var(--radius-lg); margin-bottom: var(--spacing-md); }
.feature-icon .icon { color: var(--color-primary); }
.feature-title { font-size: var(--font-size-lg); font-weight: 600; color: var(--color-foreground); margin-bottom: var(--spacing-xs); }
.feature-description { color: var(--color-muted-foreground); line-height: 1.5; font-size: var(--font-size-sm); }

.turbo-spotlight { margin-top: var(--spacing-2xl); padding: var(--spacing-lg) var(--spacing-xl); border-radius: var(--radius-lg); border: 1px solid rgba(0, 120, 255, 0.25); background: linear-gradient(135deg, rgba(0, 120, 255, 0.06) 0%, rgba(147, 51, 234, 0.06) 100%); }
.turbo-spotlight__title { font-size: var(--font-size-2xl); font-weight: 700; margin-bottom: var(--spacing-sm); color: var(--color-foreground); }
.turbo-spotlight__lead { color: var(--color-muted-foreground); margin-bottom: var(--spacing-xl); max-width: 48rem; margin-left: auto; margin-right: auto; text-align: center; }
.turbo-spotlight .section-header { margin-bottom: var(--spacing-lg); }
.turbo-features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--spacing-md); }

.pricing { background: var(--color-muted); }
.benefits-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--spacing-lg); margin-bottom: var(--spacing-2xl); }
.benefit-card { padding: var(--spacing-lg); text-align: center; }
.benefit-icon { width: 3rem; height: 3rem; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, rgba(0, 120, 255, 0.2) 0%, rgba(147, 51, 234, 0.2) 100%); border-radius: var(--radius-lg); margin: 0 auto var(--spacing-sm); }
.benefit-icon .icon { color: var(--color-primary); }
.benefit-title { font-size: var(--font-size-xl); font-weight: 600; color: var(--color-foreground); margin-bottom: var(--spacing-xs); }
.benefit-description { color: var(--color-muted-foreground); }

.pricing-tiers { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--spacing-lg); margin-bottom: var(--spacing-lg); align-items: stretch; }
.plan-card { padding: var(--spacing-xl); display: flex; flex-direction: column; height: 100%; }
.plan-card--turbo { border-color: rgba(0, 120, 255, 0.35); background: linear-gradient(135deg, rgba(0, 120, 255, 0.06) 0%, rgba(147, 51, 234, 0.06) 100%); position: relative; }
.plan-badge { position: absolute; top: var(--spacing-md); right: var(--spacing-md); font-size: var(--font-size-xs); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; padding: 0.25rem 0.6rem; border-radius: var(--radius-full); background: var(--gradient-purple); color: white; }
.plan-name { font-size: var(--font-size-xl); font-weight: 700; margin-bottom: var(--spacing-sm); color: var(--color-foreground); }
.plan-tagline { color: var(--color-muted-foreground); margin-bottom: var(--spacing-lg); font-size: var(--font-size-sm); }
.plan-price-row { margin-bottom: var(--spacing-lg); }
.plan-price { font-size: var(--font-size-3xl); font-weight: 700; color: var(--color-foreground); }
.plan-price-note { font-size: var(--font-size-sm); color: var(--color-muted-foreground); margin-top: var(--spacing-xs); }
.pricing-footnote { text-align: center; font-size: var(--font-size-sm); color: var(--color-muted-foreground); max-width: 38rem; margin: 0 auto var(--spacing-lg); }

.features-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--spacing-sm); list-style: none; margin-bottom: 0; flex: 1; }
.feature-item { display: flex; align-items: flex-start; gap: var(--spacing-sm); color: var(--color-foreground); }
.check-icon { color: var(--color-primary); flex-shrink: 0; margin-top: 0.15rem; }

.faq { background: var(--color-background); }
.accordion { display: flex; flex-direction: column; gap: var(--spacing-sm); }
.accordion-item { background: white; border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; }
.accordion-trigger { width: 100%; display: flex; align-items: center; justify-content: space-between; padding: var(--spacing-md) var(--spacing-lg); background: transparent; border: none; text-align: left; font-size: var(--font-size-base); font-weight: 600; color: var(--color-foreground); transition: color var(--transition-base); }
.accordion-trigger:hover { color: var(--color-primary); }
.accordion-icon { flex-shrink: 0; transition: transform var(--transition-base); }
.accordion-trigger[aria-expanded="true"] .accordion-icon { transform: rotate(180deg); }
.accordion-content { max-height: 0; overflow: hidden; transition: max-height var(--transition-base); }
.accordion-content p { padding: 0 var(--spacing-lg) var(--spacing-md); color: var(--color-muted-foreground); line-height: 1.5; font-size: var(--font-size-sm); }

.contact { background: linear-gradient(180deg, var(--color-muted) 0%, var(--color-background) 100%); }
.contact-card { background: linear-gradient(135deg, rgba(0, 120, 255, 0.1) 0%, rgba(147, 51, 234, 0.1) 100%); border-color: rgba(0, 120, 255, 0.2); padding: var(--spacing-2xl); text-align: center; }
.contact-card .contact-title { margin-top: 0; }
.contact-title { font-size: var(--font-size-3xl); font-weight: 700; color: var(--color-foreground); margin-bottom: var(--spacing-sm); }
.contact-description { font-size: var(--font-size-lg); color: var(--color-muted-foreground); max-width: 38rem; margin: 0 auto var(--spacing-lg); line-height: 1.5; }
.contact-buttons { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); justify-content: center; margin-bottom: var(--spacing-2xl); }
.contact-footer { padding-top: var(--spacing-lg); border-top: 1px solid rgba(214, 219, 228, 0.5); font-size: var(--font-size-sm); color: var(--color-muted-foreground); }
.contact-link { color: var(--color-primary); text-decoration: underline; }
.contact-link:hover { color: var(--color-primary-hover); }

/* Message form — light theme, bridges FAQ → contact section */
.reach-out {
  background: linear-gradient(180deg, var(--color-background) 0%, var(--color-muted) 100%);
}
.reach-out .section-header {
  margin-bottom: var(--spacing-2xl);
}
.reach-form.card {
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
  padding: var(--spacing-xl);
  text-align: left;
  background: linear-gradient(135deg, rgba(0, 120, 255, 0.06) 0%, rgba(147, 51, 234, 0.06) 100%);
  border-color: rgba(0, 120, 255, 0.2);
}
.reach-form__row {
  display: grid;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}
@media (min-width: 600px) {
  .reach-form__row--2 {
    grid-template-columns: 1fr 1fr;
  }
}
.reach-form__field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}
.reach-form__label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-foreground);
}
.reach-form__input,
.reach-form__textarea {
  width: 100%;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.625rem 0.75rem;
  font-size: var(--font-size-base);
  color: var(--color-foreground);
  font-family: inherit;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.reach-form__input::placeholder,
.reach-form__textarea::placeholder {
  color: var(--color-muted-foreground);
}
.reach-form__input:hover,
.reach-form__textarea:hover {
  border-color: hsl(214 32% 82%);
}
.reach-form__input:focus,
.reach-form__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 120, 255, 0.15);
}
.reach-form__textarea {
  min-height: 5.5rem;
  resize: vertical;
  line-height: 1.5;
}
.reach-form .reach-form__submit {
  margin-top: var(--spacing-sm);
}
.reach-form__status {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 1.25rem;
  color: var(--color-muted-foreground);
}
.reach-form__status--ok {
  color: hsl(152 60% 32%);
}
.reach-form__status--error {
  color: hsl(0 65% 42%);
}
.reach-form__fineprint {
  margin-top: var(--spacing-lg);
  font-size: var(--font-size-xs);
  color: var(--color-muted-foreground);
  line-height: 1.55;
}

.footer { padding: var(--spacing-2xl) var(--spacing-md); background: var(--color-muted); border-top: 1px solid var(--color-border); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--spacing-lg); margin-bottom: var(--spacing-lg); }
.footer-brand { grid-column: span 1; }
.footer-logo { display: flex; align-items: center; gap: var(--spacing-sm); margin-bottom: var(--spacing-md); text-decoration: none; color: inherit; }
.footer-logo:hover { text-decoration: none; color: inherit; }
.footer-heading { font-size: var(--font-size-base); font-weight: 600; color: var(--color-foreground); margin-bottom: var(--spacing-md); }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: var(--spacing-sm); }
.footer-links a { font-size: var(--font-size-sm); color: var(--color-muted-foreground); transition: color var(--transition-base); }
.footer-links a:hover { color: var(--color-primary); }
.footer-entity {
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: space-between;
  align-items: flex-start;
}
.footer-entity__address {
  font-size: var(--font-size-sm);
  color: var(--color-muted-foreground);
  max-width: 32rem;
  line-height: 1.55;
  margin: 0;
}
.footer-entity__address strong {
  color: var(--color-foreground);
  font-weight: 600;
}

.footer-bottom { padding-top: var(--spacing-lg); border-top: 1px solid var(--color-border); text-align: center; font-size: var(--font-size-sm); color: var(--color-muted-foreground); }

@media (min-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: var(--font-size-6xl); }
  .section-title { font-size: var(--font-size-4xl); }
}
@media (max-width: 767px) {
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; background: white; border-top: 1px solid var(--color-border); padding: var(--spacing-lg); gap: var(--spacing-md); }
  .nav-links.active { display: flex; }
  .nav-toggle { display: block; }
  .hero { padding-top: 4.5rem; }
  .hero-title-row { gap: var(--spacing-md); }
  .hero-title { font-size: var(--font-size-3xl); }
  .section-title { font-size: var(--font-size-3xl); }
  .contact-title { font-size: var(--font-size-3xl); }
  .hero-buttons, .contact-buttons { flex-direction: column; }
  .btn-lg { width: 100%; }
}

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

.policy-content { line-height: 1.7; }
.policy-content h2 { font-size: var(--font-size-xl); font-weight: 600; color: var(--color-foreground); margin-top: var(--spacing-xl); margin-bottom: var(--spacing-sm); padding-bottom: var(--spacing-xs); border-bottom: 1px solid var(--color-border); }
.policy-content h2:first-child { margin-top: 0; }
.policy-content h3 { font-size: var(--font-size-lg); font-weight: 600; color: var(--color-foreground); margin-top: var(--spacing-lg); margin-bottom: var(--spacing-xs); }
.policy-content p { margin-bottom: var(--spacing-sm); color: var(--color-muted-foreground); }
.policy-content ul { margin-bottom: var(--spacing-md); padding-left: var(--spacing-lg); }
.policy-content li { margin-bottom: var(--spacing-xs); color: var(--color-muted-foreground); }
.policy-content a { color: var(--color-primary); text-decoration: underline; }
.policy-content a:hover { color: var(--color-primary-hover); }