/**
 * Component styles: header, hero, steps, fit cards, safety band,
 * buy CTA, footer, buttons, and shared card primitives.
 */

/* ============ Buttons ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-base);
  letter-spacing: 0.01em;
  transition: transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out);
  border: 2px solid transparent;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-fg);
  box-shadow: var(--shadow-glow-red);
}

.btn--primary:hover {
  background: var(--color-primary-strong);
}

.btn--outline {
  background: transparent;
  color: var(--color-fg);
  border-color: var(--color-surface-border);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--block {
  width: 100%;
}

/* ============ Header ============ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: rgba(11, 13, 12, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-surface-border);
}

.site-header__inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: var(--weight-black);
  font-size: var(--text-xl);
  color: var(--color-fg);
}

.brand__mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand__word {
  letter-spacing: -0.02em;
}

.brand__word span {
  color: var(--color-primary-strong);
}

.main-nav {
  display: none;
}

@media (min-width: 900px) {
  .main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
  }

  .main-nav a {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-fg-muted);
    transition: color var(--duration-fast) var(--ease-out);
    position: relative;
    padding-block: var(--space-2);
  }

  .main-nav a:hover,
  .main-nav a:focus-visible {
    color: var(--color-fg);
  }

  .main-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary-strong);
    transition: width var(--duration-normal) var(--ease-out);
  }

  .main-nav a:hover::after,
  .main-nav a:focus-visible::after {
    width: 100%;
  }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header-actions .btn {
  padding: var(--space-2) var(--space-6);
  min-height: 44px;
  font-size: var(--text-sm);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-md);
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }
}

.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-fg);
  position: relative;
  transition: transform var(--duration-normal) var(--ease-out),
    opacity var(--duration-normal) var(--ease-out);
}

.nav-toggle__bar::before {
  position: absolute;
  top: -6px;
}

.nav-toggle__bar::after {
  position: absolute;
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  inset: var(--header-height) 0 0 0;
  z-index: var(--z-overlay);
  background: var(--color-bg);
  padding: var(--space-8) var(--space-6);
  display: none;
}

.mobile-nav.is-open {
  display: block;
}

@media (min-width: 900px) {
  .mobile-nav {
    display: none !important;
  }
}

.mobile-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav a {
  display: block;
  padding: var(--space-4) var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  border-bottom: 1px solid var(--color-surface-border);
}

.mobile-nav .btn {
  margin-top: var(--space-8);
}

/* ============ Hero ============ */

.hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-24) var(--space-16);
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 140%;
  background: radial-gradient(
    circle at 78% 30%,
    rgba(200, 30, 44, 0.28),
    transparent 55%
  );
  z-index: -1;
  pointer-events: none;
}

.hero__grid {
  display: grid;
  gap: var(--space-16);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: var(--space-8);
  }
}

.hero__title {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-6);
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: var(--text-6xl);
  }
}

.hero__title em {
  font-style: normal;
  color: var(--color-primary-strong);
}

.hero__lead {
  font-size: var(--text-lg);
  color: var(--color-fg-muted);
  max-width: 52ch;
  margin-bottom: var(--space-8);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: var(--space-8);
}

.hero__stat-value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: var(--weight-black);
  color: var(--color-fg);
  line-height: 1;
}

.hero__stat-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-fg-subtle);
  margin-top: var(--space-2);
}

.hero__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__visual img {
  width: 100%;
  max-width: 480px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-surface-border);
  filter: drop-shadow(0 24px 48px rgba(0, 0, 0, 0.5));
}

/* ============ Steps (installation sequence) ============ */

.steps {
  background: var(--color-bg-raised);
  border-block: 1px solid var(--color-surface-border);
}

.steps__list {
  display: grid;
  gap: var(--space-8);
  counter-reset: step;
}

@media (min-width: 768px) {
  .steps__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1200px) {
  .steps__list {
    grid-template-columns: repeat(4, 1fr);
  }
}

.step-card {
  counter-increment: step;
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
  transition: border-color var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out);
}

.step-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
}

.step-card__number {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-primary-strong);
  letter-spacing: 0.05em;
}

.step-card__number::before {
  content: "STEP " counter(step, decimal-leading-zero);
}

.step-card__visual {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  background: var(--color-neutral-900);
  border: 1px solid var(--color-surface-border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.step-card__visual svg {
  width: 78%;
  height: 78%;
}

.step-card__title {
  font-size: var(--text-lg);
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
}

.step-card__body {
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
}

.fit-card__photo {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-surface-border);
}

/* ============ Fit & Compatibility ============ */

.fit-grid {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 900px) {
  .fit-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.fit-card {
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.fit-card--featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow-red);
}

.fit-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.fit-card__icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
}

.fit-card__title {
  font-size: var(--text-xl);
  font-family: var(--font-display);
}

.fit-card__tag {
  display: inline-block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-secondary-strong);
}

.fit-card__body {
  color: var(--color-fg-muted);
}

.fit-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.fit-card__list li {
  display: flex;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
}

.fit-card__list svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-secondary-strong);
  margin-top: 2px;
}

/* ============ Safety band ============ */

.safety {
  background: var(--color-bg-raised);
}

.safety__card {
  background: linear-gradient(
    155deg,
    var(--color-neutral-900) 0%,
    var(--color-neutral-800) 100%
  );
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
}

@media (min-width: 768px) {
  .safety__card {
    padding: var(--space-12);
  }
}

.safety__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: var(--color-primary);
}

.safety__grid {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 700px) {
  .safety__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .safety__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.safety-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.safety-item__icon {
  width: 44px;
  height: 44px;
  color: var(--color-primary-strong);
}

.safety-item__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-base);
}

.safety-item__body {
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
}

/* ============ Buy / CTA ============ */

.cta {
  position: relative;
  overflow: hidden;
  background: var(--color-neutral-900);
  border-block: 1px solid var(--color-surface-border);
  isolation: isolate;
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at 15% 50%,
    rgba(28, 138, 90, 0.22),
    transparent 50%
  ),
  radial-gradient(circle at 85% 50%, rgba(200, 30, 44, 0.25), transparent 50%);
  z-index: -1;
}

.cta__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-6);
}

.cta__title {
  font-size: var(--text-3xl);
  max-width: 20ch;
}

@media (min-width: 768px) {
  .cta__title {
    font-size: var(--text-4xl);
  }
}

.cta__lead {
  color: var(--color-fg-muted);
  max-width: 50ch;
  font-size: var(--text-lg);
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-4);
}

.cta__note {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-fg-subtle);
  letter-spacing: 0.04em;
}

.cta__disclaimer {
  font-size: var(--text-xs);
  color: var(--color-fg-subtle);
  opacity: 0.7;
  margin-top: var(--space-2);
}

/* ============ Footer ============ */

.site-footer {
  padding-block: var(--space-16) var(--space-8);
  border-top: 1px solid var(--color-surface-border);
}

.footer__grid {
  display: grid;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

.footer__brand p {
  color: var(--color-fg-muted);
  font-size: var(--text-sm);
  max-width: 36ch;
  margin-top: var(--space-4);
}

.footer__heading {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-fg-subtle);
  margin-bottom: var(--space-4);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__links a {
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__links a:hover,
.footer__links a:focus-visible {
  color: var(--color-fg);
}

.social-row {
  display: flex;
  gap: var(--space-3);
}

.social-link {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
  color: var(--color-fg-muted);
}

.social-link:hover,
.social-link:focus-visible {
  border-color: var(--color-primary-strong);
  color: var(--color-primary-strong);
}

.social-link svg {
  width: 20px;
  height: 20px;
}

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-surface-border);
  font-size: var(--text-xs);
  color: var(--color-fg-subtle);
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* ============ Segmented divider (dartboard wedge motif) ============ */

.wedge-divider {
  width: 100%;
  height: 10px;
  display: flex;
}

.wedge-divider span {
  flex: 1;
}

.wedge-divider span:nth-child(odd) {
  background: var(--color-neutral-100);
}

.wedge-divider span:nth-child(even) {
  background: var(--color-neutral-950);
}

/* ============ Contact ============ */

.contact-grid {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: var(--space-12);
  }
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  padding: var(--space-8);
  background: linear-gradient(
    155deg,
    var(--color-neutral-900) 0%,
    var(--color-neutral-800) 100%
  );
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-xl);
}

.contact-info__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.contact-info__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-fg-subtle);
}

.contact-info__value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-fg);
  transition: color var(--duration-fast) var(--ease-out);
  word-break: break-word;
}

a.contact-info__value:hover,
a.contact-info__value:focus-visible {
  color: var(--color-primary-strong);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-xl);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-field label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-fg-subtle);
}

.form-field input,
.form-field textarea {
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-md);
  color: var(--color-fg);
  font-size: var(--text-base);
  resize: vertical;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary-strong);
}

.contact-form__note {
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
  min-height: 1.2em;
}

/* ============ FAQ ============ */

.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 760px;
}

.faq-item {
  border: 1px solid var(--color-surface-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
}

.faq-item__question::-webkit-details-marker {
  display: none;
}

.faq-item__question::after {
  content: "";
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-primary-strong);
  border-radius: var(--radius-full);
  background-image: linear-gradient(
      var(--color-primary-strong),
      var(--color-primary-strong)
    ),
    linear-gradient(var(--color-primary-strong), var(--color-primary-strong));
  background-repeat: no-repeat;
  background-position: center;
  background-size: 10px 2px, 2px 10px;
  transition: transform var(--duration-normal) var(--ease-out);
}

.faq-item[open] .faq-item__question::after {
  transform: rotate(45deg);
}

.faq-item__answer {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-fg-muted);
  max-width: 60ch;
}

.faq-item__answer a {
  color: var(--color-primary-strong);
  text-decoration: underline;
  text-underline-offset: 3px;
}