/* Threestart — Bold Brutalist Design System */

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

:root {
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --transition-theme: 150ms ease;
  --max-width: 1200px;
  --section-padding-desktop: clamp(80px, 10vw, 120px);
  --section-padding-mobile: clamp(48px, 8vw, 64px);
}

html[data-theme='dark'] {
  --bg: #0a0a0a;
  --surface: #141414;
  --fg: #f2f2f2;
  --accent: #ff3b00;
  --border: #f2f2f2;
  --muted: #999999;
}

html[data-theme='light'] {
  --bg: #f2f2f2;
  --surface: #ffffff;
  --fg: #0a0a0a;
  --accent: #ff3b00;
  --border: #0a0a0a;
  --muted: #555555;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--fg);
  background-color: var(--bg);
  transition: background-color var(--transition-theme), color var(--transition-theme);
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

a:hover {
  color: var(--accent);
}

/* Typography */

.display {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 0.95;
}

.hero-headline {
  font-size: clamp(48px, 10vw, 120px);
}

.section-headline {
  font-size: clamp(28px, 5vw, 56px);
  margin-bottom: 1.5rem;
}

.hero-italic {
  font-style: italic;
  text-transform: lowercase;
}

.subheading {
  font-size: clamp(20px, 2.5vw, 24px);
  font-weight: 600;
  line-height: 1.3;
}

.body-lg {
  font-size: clamp(16px, 2vw, 18px);
  max-width: 720px;
}

.label {
  font-size: clamp(12px, 1.5vw, 14px);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* Layout */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg);
  border-bottom: 2px solid var(--border);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  gap: 1rem;
}

.logo-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: none;
  border: none;
  color: var(--fg);
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem;
  min-height: 44px;
  transition: color var(--transition-theme);
}

.logo-threestart svg {
  transform: rotate(90deg);
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition-theme), border-color var(--transition-theme);
}

.nav-link:hover {
  color: var(--accent);
}

.nav-link--active {
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 2px solid var(--border);
  color: var(--fg);
  cursor: pointer;
  min-width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0 0.75rem;
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: border-color var(--transition-theme), color var(--transition-theme), background-color var(--transition-theme);
}

.nav-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.nav-toggle[aria-expanded='true'] {
  color: var(--accent);
  border-color: var(--accent);
}

.nav-toggle-label {
  display: block;
  line-height: 1;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background-color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 200ms ease, visibility 200ms ease, background-color var(--transition-theme);
}

.nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.nav-overlay nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
}

.nav-overlay a {
  font-family: var(--font-display);
  font-size: clamp(32px, 8vw, 56px);
  font-weight: 700;
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: -0.02em;
}

main {
  display: block;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding-top: var(--section-padding-desktop);
  padding-bottom: var(--section-padding-desktop);
  border-bottom: 2px solid var(--border);
  transition: border-color var(--transition-theme);
}

.section--hero {
  padding-top: clamp(64px, 12vw, 140px);
  padding-bottom: clamp(64px, 12vw, 140px);
}

.section--compact {
  padding-top: var(--section-padding-mobile);
  padding-bottom: var(--section-padding-mobile);
}

/* Components */

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
  margin-top: 2rem;
  min-height: 44px;
}

.text-link:hover {
  color: var(--accent);
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--fg);
  background: transparent;
  border: 2px solid var(--border);
  transition: background-color var(--transition-theme), color var(--transition-theme), border-color var(--transition-theme);
}

.btn-cta:hover {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.status-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.product-icon {
  color: var(--accent);
  flex-shrink: 0;
}

.product-icon--card {
  width: 48px;
  height: 48px;
}

.product-icon--hero {
  width: 64px;
  height: 64px;
  margin-bottom: 1.5rem;
}

/* Product cards */

.product-list {
  display: flex;
  flex-direction: column;
}

.product-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.5rem;
  padding: 2rem 0;
  border-bottom: 2px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-theme);
}

.product-card:first-child {
  border-top: 2px solid var(--border);
}

.product-card:hover {
  color: var(--accent);
}

.product-card:hover .product-card-title {
  color: var(--accent);
}

.product-card-index {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--muted);
}

.product-card-body {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.product-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.product-card-title {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  transition: color var(--transition-theme);
}

.product-card-desc {
  font-size: clamp(16px, 2vw, 18px);
  color: var(--muted);
  max-width: 640px;
  line-height: 1.6;
}

.product-card-arrow {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
}

/* Product detail */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.feature-item {
  border-top: 2px solid var(--border);
  padding-top: 1.5rem;
}

.feature-item h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}

.feature-item p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.content-block {
  margin-bottom: 3rem;
}

.content-block:last-child {
  margin-bottom: 0;
}

.content-block h2 {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
}

.content-block p {
  font-size: clamp(16px, 2vw, 18px);
  color: var(--muted);
  max-width: 720px;
  margin-bottom: 1rem;
}

.content-block p:last-child {
  margin-bottom: 0;
}

.about-section {
  margin-bottom: 3rem;
}

.about-section h2 {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.5vw, 22px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.about-section p {
  font-size: clamp(16px, 2vw, 18px);
  color: var(--muted);
  max-width: 720px;
  margin-bottom: 1rem;
}

.faq-list {
  margin-top: 3rem;
  border-top: 2px solid var(--border);
}

.faq-item {
  padding: 1.5rem 0;
  border-bottom: 2px solid var(--border);
}

.faq-item h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.faq-item p {
  color: var(--muted);
  font-size: 1rem;
}

/* Footer */

.site-footer {
  border-top: 2px solid var(--border);
  padding: 3rem 1.5rem;
  transition: border-color var(--transition-theme);
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.footer-email {
  font-size: 1rem;
  text-decoration: none;
}

.footer-email:hover {
  color: var(--accent);
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--muted);
  margin-top: 1rem;
}

/* Focus & accessibility */

.logo-button:focus-visible,
.nav-link:focus-visible,
.nav-toggle:focus-visible,
.text-link:focus-visible,
.btn-cta:focus-visible,
.product-card:focus-visible,
.footer-email:focus-visible,
.nav-overlay a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Responsive */

@media (max-width: 767px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .section {
    padding-top: var(--section-padding-mobile);
    padding-bottom: var(--section-padding-mobile);
  }

  .product-card {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .product-card-arrow {
    display: none;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}