/* ============================================================
   MB Bikes — styles.css
   Mobile-first, ~1100px container, WCAG AA contrast
   ============================================================ */

:root {
  /* Colour system — charcoal + amber, evoking tarmac & bike detailing */
  --color-ink: #14161a;
  --color-ink-soft: #2a2e35;
  --color-body: #3f444d;
  --color-muted: #5b6069;
  --color-cream: #f7f4ee;
  --color-paper: #fdfcf9;
  --color-line: #e4dfd6;
  --color-amber: #e09112;
  --color-amber-deep: #b06f05;
  --color-amber-tint: #fbf0dc;

  /* Typography */
  --font-display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --step--1: clamp(0.85rem, 0.83rem + 0.15vw, 0.95rem);
  --step-0: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --step-1: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --step-2: clamp(1.6rem, 1.4rem + 1vw, 2.2rem);
  --step-3: clamp(2.2rem, 1.7rem + 2.2vw, 3.4rem);
  --step-4: clamp(2.8rem, 2rem + 3.5vw, 4.5rem);

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.25rem;
  --space-5: 3.5rem;
  --space-6: 5rem;
  --space-7: 7rem;

  /* Layout & misc */
  --container: 1100px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-soft: 0 1px 3px rgba(20, 22, 26, 0.08), 0 12px 32px rgba(20, 22, 26, 0.08);
  --transition: 200ms ease;

  --nav-height: 68px;
}

/* ---------- Reset-ish ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 12px);
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--color-body);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.1;
  letter-spacing: 0.01em;
  margin: 0;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
}

.icon {
  width: 24px;
  height: 24px;
  display: block;
}

/* Focus visibility */
:focus-visible {
  outline: 3px solid var(--color-amber);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(253, 252, 249, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 var(--space-3);
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-2);
  text-decoration: none;
  color: var(--color-ink);
  letter-spacing: 0.03em;
  line-height: 1;
  padding-block: var(--space-2);
}

.wordmark-accent {
  color: var(--color-amber-deep);
}

/* Hamburger button */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-paper);
  color: var(--color-ink);
  cursor: pointer;
  transition: border-color var(--transition), background-color var(--transition);
}

.nav-toggle:hover {
  border-color: var(--color-amber-deep);
  background: var(--color-amber-tint);
}

.nav-toggle .icon-close {
  display: none;
}

/* Mobile nav: hidden until #site-header.nav-open */
.primary-nav {
  display: none;
}

#site-header.nav-open .primary-nav {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
  box-shadow: var(--shadow-soft);
}

#site-header.nav-open .icon-menu {
  display: none;
}

#site-header.nav-open .icon-close {
  display: block;
}

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

.nav-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-weight: 500;
  font-size: var(--step-0);
  text-decoration: none;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
  transition: background-color var(--transition), color var(--transition);
}

.nav-link:hover {
  background: var(--color-amber-tint);
  color: var(--color-amber-deep);
}

/* Desktop nav */
@media (min-width: 760px) {
  .nav-toggle {
    display: none;
  }

  .primary-nav {
    display: block;
  }

  .nav-list {
    flex-direction: row;
    gap: var(--space-1);
  }

  .nav-link {
    padding: var(--space-1) var(--space-2);
    border-bottom: none;
    border-radius: var(--radius);
    font-size: var(--step--1);
    font-weight: 600;
  }

  .nav-link:hover {
    background: transparent;
    color: var(--color-amber-deep);
  }
}

/* ============================================================
   Hero — decorative gradient + pattern, no image files
   ============================================================ */
.hero {
  position: relative;
  isolation: isolate;
  background:
    radial-gradient(ellipse 70% 90% at 85% 20%, rgba(224, 145, 18, 0.22), transparent 60%),
    linear-gradient(160deg, #1b1e24 0%, #14161a 55%, #23262d 100%);
  color: var(--color-cream);
  overflow: hidden;
  padding-block: var(--space-6);
}

/* Speed-line pattern overlay */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: repeating-linear-gradient(
    115deg,
    transparent 0,
    transparent 90px,
    rgba(247, 244, 238, 0.05) 90px,
    rgba(247, 244, 238, 0.05) 92px
  );
}

/* Warm glow at the base */
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 45%;
  z-index: -1;
  background: linear-gradient(to top, rgba(224, 145, 18, 0.16), transparent);
}

.hero-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.hero-kicker {
  font-size: var(--step--1);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-amber);
  margin-bottom: var(--space-2);
}

.hero-heading {
  font-size: var(--step-4);
  color: #ffffff;
  max-width: 14ch;
  text-wrap: balance;
}

.hero-sub {
  margin-top: var(--space-3);
  font-size: var(--step-1);
  max-width: 42ch;
  color: rgba(247, 244, 238, 0.88);
}

.hero .button {
  margin-top: var(--space-4);
}

/* ============================================================
   Buttons
   ============================================================ */
.button {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--step-0);
  padding: 0.85em 1.9em;
  border-radius: 999px;
  border: 2px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--transition), background-color var(--transition),
    border-color var(--transition), color var(--transition), box-shadow var(--transition);
}

.button-primary {
  background: var(--color-amber);
  color: var(--color-ink);
  border-color: var(--color-amber);
}

.button-primary:hover {
  background: #f0a52a;
  border-color: #f0a52a;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(224, 145, 18, 0.35);
}

/* On dark hero the primary button keeps strong contrast */
.hero .button-primary {
  color: #14161a;
}

/* ============================================================
   Shared section scaffolding
   ============================================================ */
.section-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

section {
  padding-block: var(--space-6);
}

.section-title {
  font-size: var(--step-3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-3);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  margin-top: var(--space-2);
  background: var(--color-amber);
  border-radius: 2px;
}

.section-intro {
  font-size: var(--step-1);
  color: var(--color-muted);
  max-width: 50ch;
  margin-bottom: var(--space-4);
}

/* ============================================================
   About
   ============================================================ */
.about {
  background: var(--color-paper);
}

.about-copy {
  max-width: 62ch;
  display: grid;
  gap: var(--space-3);
  font-size: var(--step-0);
}

.about-copy p:first-child {
  font-size: var(--step-1);
  color: var(--color-ink-soft);
}

/* ============================================================
   Services — tinted background
   ============================================================ */
.services {
  background: var(--color-cream);
  border-block: 1px solid var(--color-line);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.card {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), border-color var(--transition);
}

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

.card-icon {
  width: 36px;
  height: 36px;
  color: var(--color-amber-deep);
  margin-bottom: var(--space-2);
}

.card-title {
  font-size: var(--step-1);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-1);
}

.card-text {
  font-size: var(--step--1);
  color: var(--color-body);
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
  }
}

/* ============================================================
   Why choose us — dark contrast band
   ============================================================ */
.why-choose-us {
  background: linear-gradient(180deg, #1b1e24, #14161a);
}

.why-choose-us .section-title {
  color: #ffffff;
}

.reason-list {
  display: grid;
  gap: var(--space-4);
}

.reason {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.reason-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  color: var(--color-amber);
}

.reason-title {
  font-size: var(--step-1);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #ffffff;
  margin-bottom: var(--space-1);
}

.reason-text {
  color: rgba(247, 244, 238, 0.82);
  font-size: var(--step-0);
}

@media (min-width: 760px) {
  .reason-list {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
  }
}

/* ============================================================
   Contact
   ============================================================ */
.contact {
  background: var(--color-cream);
}

.contact-grid {
  display: grid;
  gap: var(--space-5);
}

.contact-lead {
  font-size: var(--step-1);
  color: var(--color-ink-soft);
  max-width: 38ch;
  margin-bottom: var(--space-3);
}

.contact-address {
  font-style: normal;
  margin-bottom: var(--space-3);
  display: grid;
  gap: var(--space-1);
}

.contact-line {
  font-weight: 500;
  color: var(--color-ink);
}

.social-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.social-link {
  display: inline-block;
  padding: 0.4em 1.1em;
  border: 1px solid var(--color-ink);
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: var(--step--1);
  color: var(--color-ink);
  transition: background-color var(--transition), color var(--transition),
    border-color var(--transition);
}

.social-link:hover {
  background: var(--color-ink);
  color: var(--color-cream);
}

/* Form */
.contact-form {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-soft);
  display: grid;
  gap: var(--space-3);
}

.form-field {
  display: grid;
  gap: var(--space-1);
}

.form-label {
  font-weight: 600;
  font-size: var(--step--1);
  color: var(--color-ink);
}

.form-input {
  font-family: inherit;
  font-size: var(--step-0);
  color: var(--color-ink);
  padding: 0.7em 0.9em;
  border: 1px solid var(--color-muted);
  border-radius: var(--radius);
  background: #ffffff;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:hover {
  border-color: var(--color-ink-soft);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-amber-deep);
  box-shadow: 0 0 0 3px rgba(224, 145, 18, 0.3);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-note {
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--color-amber-deep);
  min-height: 1.4em;
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 1.2fr;
    align-items: start;
    gap: var(--space-6);
  }
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--color-ink);
  color: rgba(247, 244, 238, 0.78);
  padding-block: var(--space-5) var(--space-3);
}

.footer-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
  display: grid;
  gap: var(--space-4);
}

.footer-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-2);
  color: #ffffff;
  letter-spacing: 0.03em;
  line-height: 1;
}

.footer-name-accent {
  color: var(--color-amber);
}

.footer-tagline {
  margin-top: var(--space-1);
  font-size: var(--step--1);
  max-width: 36ch;
}

.footer-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
}

.footer-link {
  text-decoration: none;
  font-size: var(--step--1);
  font-weight: 500;
  color: rgba(247, 244, 238, 0.78);
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--color-amber);
}

.footer-copyright {
  font-size: var(--step--1);
  border-top: 1px solid rgba(247, 244, 238, 0.18);
  padding-top: var(--space-3);
}

@media (min-width: 760px) {
  .footer-inner {
    grid-template-columns: 1fr auto;
    align-items: start;
  }

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

/* ============================================================
   Scroll-reveal states
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
}

.reveal.is-revealed {
  opacity: 1;
  transform: none;
  transition: opacity 600ms ease, transform 600ms ease;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .reveal.is-revealed {
    transition: none;
  }

  .button,
  .card,
  .nav-link,
  .social-link,
  .form-input {
    transition: none;
  }

  .button-primary:hover,
  .card:hover {
    transform: none;
  }
}