/* Elite Diesel Service — Design system */
:root {
  --color-bg: #0d1117;
  --color-bg-elevated: #161b22;
  --color-bg-card: #21262d;
  --color-surface: #30363d;
  --color-border: #30363d;
  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-accent: #f0b429;
  --color-accent-hover: #f5c84d;
  --color-accent-dim: rgba(240, 180, 41, 0.15);
  --color-cta: #238636;
  --color-cta-hover: #2ea043;
  --font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Outfit", var(--font-sans);
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--color-accent-hover);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  margin-top: 0;
  margin-bottom: var(--space-md);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; }

p {
  margin-top: 0;
  margin-bottom: var(--space-md);
  color: var(--color-text-muted);
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.section {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

.section--alt {
  background: var(--color-bg-elevated);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-top {
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-bg-elevated);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.header-top .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.header-top a {
  color: var(--color-text-muted);
}
.header-top a:hover {
  color: var(--color-accent);
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  padding: var(--space-md) var(--space-lg);
}

.site-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}
.site-logo span { color: var(--color-accent); }

.nav-main {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.nav-main a {
  color: var(--color-text-muted);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius);
  font-weight: 500;
}
.nav-main a:hover {
  color: var(--color-text);
  background: var(--color-bg-card);
}

.nav-dropdown {
  position: relative;
}
.nav-dropdown:hover .nav-dropdown__menu {
  opacity: 1;
  visibility: visible;
}
.nav-dropdown__menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  padding: var(--space-sm);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}
.nav-dropdown__menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-muted);
  border-radius: var(--radius);
}
.nav-dropdown__menu a:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.header-ctas {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.625rem 1.25rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}
.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn--primary {
  background: var(--color-cta);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-cta-hover);
}

.btn--accent {
  background: var(--color-accent);
  color: #0d1117;
}
.btn--accent:hover {
  background: var(--color-accent-hover);
  color: #0d1117;
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--outline:hover {
  background: var(--color-bg-card);
  border-color: var(--color-text-muted);
}

.btn--sm { padding: 0.5rem 1rem; font-size: 0.875rem; }

/* Hero */
.hero {
  position: relative;
  padding: var(--space-3xl) var(--space-lg);
  background: linear-gradient(180deg, var(--color-bg-elevated) 0%, var(--color-bg) 100%);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, var(--color-accent-dim), transparent 60%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
}
@media (min-width: 768px) {
  .hero .container { grid-template-columns: 1fr auto; }
}

.hero__content h1 {
  margin-bottom: var(--space-md);
  color: var(--color-text);
}
.hero__content .lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
  max-width: 42ch;
}
.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}
.hero__trust {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.hero__trust strong { color: var(--color-accent); }

/* Service tiles grid */
.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.tile {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.tile:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow);
}
.tile__icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}
.tile h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  font-size: 1.125rem;
}
.tile p {
  margin-bottom: var(--space-md);
  font-size: 0.9375rem;
}
.tile a {
  font-weight: 600;
  font-size: 0.9375rem;
}

/* Benefits / feature list */
.benefits {
  display: grid;
  gap: var(--space-xl);
}
@media (min-width: 640px) {
  .benefits { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .benefits { grid-template-columns: repeat(3, 1fr); }
}

.benefit {
  display: flex;
  gap: var(--space-md);
}
.benefit__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--color-accent-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}
.benefit h3 {
  margin-bottom: var(--space-xs);
  font-size: 1rem;
  color: var(--color-text);
}
.benefit p {
  margin: 0;
  font-size: 0.9375rem;
}

/* Process steps */
.process {
  display: grid;
  gap: var(--space-xl);
  counter-reset: step;
}
@media (min-width: 640px) {
  .process { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .process { grid-template-columns: repeat(5, 1fr); }
}

.process__item {
  position: relative;
  padding-left: 3rem;
  counter-increment: step;
}
.process__item::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  background: var(--color-accent);
  color: #0d1117;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.process__item h3 {
  margin-bottom: var(--space-xs);
  font-size: 1rem;
  color: var(--color-text);
}
.process__item p {
  margin: 0;
  font-size: 0.9375rem;
}

/* Featured sections (3-column) */
.featured-grid {
  display: grid;
  gap: var(--space-xl);
}
@media (min-width: 640px) {
  .featured-grid { grid-template-columns: repeat(3, 1fr); }
}

.featured-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}
.featured-card h3 {
  color: var(--color-text);
  margin-bottom: var(--space-md);
}
.featured-card ul {
  margin: 0 0 var(--space-md);
  padding-left: 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}
.featured-card li { margin-bottom: var(--space-xs); }
.featured-card a { font-weight: 600; }

/* Reviews strip */
.reviews-strip {
  display: grid;
  gap: var(--space-lg);
}
@media (min-width: 768px) {
  .reviews-strip { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .reviews-strip { grid-template-columns: repeat(3, 1fr); }
}

.review-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}
.review-card__stars {
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  font-size: 1rem;
}
.review-card__text {
  margin-bottom: var(--space-md);
  font-size: 0.9375rem;
  font-style: italic;
  color: var(--color-text);
}
.review-card__author {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* CTA banner */
.cta-banner {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  background: linear-gradient(180deg, var(--color-bg-elevated) 0%, var(--color-bg) 100%);
  border-top: 1px solid var(--color-border);
}
.cta-banner h2 {
  color: var(--color-text);
  margin-bottom: var(--space-md);
}
.cta-banner p {
  margin-bottom: var(--space-xl);
  max-width: 40ch;
  margin-left: auto;
  margin-right: auto;
}
.cta-banner .btn { margin: 0 var(--space-sm); }

/* Footer */
.site-footer {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) var(--space-lg) var(--space-xl);
}

.footer-grid {
  display: grid;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}
@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

.footer-brand .site-logo {
  display: inline-block;
  margin-bottom: var(--space-md);
}
.footer-brand p {
  font-size: 0.9375rem;
  margin-bottom: var(--space-md);
  max-width: 36ch;
}
.footer h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}
.footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer ul li { margin-bottom: var(--space-sm); }
.footer ul a { color: var(--color-text-muted); font-size: 0.9375rem; }
.footer ul a:hover { color: var(--color-accent); }

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}
.footer-bottom a { color: var(--color-text-muted); }
.footer-compliance {
  margin-top: var(--space-md);
  font-size: 0.75rem;
  opacity: 0.9;
}

/* Page header (inner pages) */
.page-hero {
  padding: var(--space-2xl) var(--space-lg);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}
.page-hero h1 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}
.page-hero .lead {
  color: var(--color-text-muted);
  margin-bottom: 0;
  max-width: 60ch;
}

/* FAQ accordion-style */
.faq-list { max-width: 800px; }
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}
.faq-item:first-child { padding-top: 0; }
.faq-item h3 {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}
.faq-item p {
  margin: 0;
  font-size: 0.9375rem;
}

/* FAQ accordion (details/summary) */
.faq-accordion {
  max-width: 800px;
}
.faq-accordion details {
  border-bottom: 1px solid var(--color-border);
}
.faq-accordion details:first-child {
  border-top: 1px solid var(--color-border);
}
.faq-accordion summary {
  padding: var(--space-lg) 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}
.faq-accordion summary::-webkit-details-marker { display: none; }
.faq-accordion summary::after {
  content: "+";
  flex-shrink: 0;
  color: var(--color-accent);
  font-size: 1.25rem;
  line-height: 1;
}
.faq-accordion details[open] summary::after {
  content: "−";
}
.faq-accordion summary:hover {
  color: var(--color-accent);
}
.faq-accordion .faq-accordion__answer {
  padding: 0 0 var(--space-lg);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.faq-accordion .faq-accordion__answer p { margin: 0; }

/* Contact form */
.form-grid {
  display: grid;
  gap: var(--space-lg);
}
@media (min-width: 640px) {
  .form-grid { grid-template-columns: repeat(2, 1fr); }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.625rem var(--space-md);
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-card);
  color: var(--color-text);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-group--full { grid-column: 1 / -1; }

.form-message {
  font-size: 0.9375rem;
}
.form-message--success {
  background: rgba(35, 134, 54, 0.2);
  border: 1px solid var(--color-cta);
  color: var(--color-text);
}
.form-message--error {
  background: rgba(248, 81, 73, 0.15);
  border: 1px solid #f85149;
  color: var(--color-text);
}

.contact-two-col {
  display: grid;
  gap: var(--space-2xl);
}
@media (min-width: 960px) {
  .contact-two-col { grid-template-columns: 1fr 1fr; }
}
.contact-info p { margin-bottom: var(--space-sm); }
.contact-info a[href^="tel"]:not(.btn) {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-accent);
}
/* Keep button text dark when button is inside contact-info (e.g. Call Now) */
.contact-info a.btn--accent {
  color: #0d1117;
}
.contact-info a.btn--accent:hover {
  color: #0d1117;
}

/* Service area list */
.service-area-list {
  display: grid;
  gap: var(--space-lg);
}
@media (min-width: 640px) {
  .service-area-list { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .service-area-list { grid-template-columns: repeat(3, 1fr); }
}
.service-area-list ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--color-text-muted);
}

/* Utility */
.text-center { text-align: center; }
.section-title {
  margin-bottom: var(--space-xl);
  color: var(--color-text);
}
.section-title .lead {
  margin-top: var(--space-sm);
  font-size: 1rem;
  color: var(--color-text-muted);
}

/* Nav toggle checkbox: always visually hidden (used for mobile menu) */
.nav-toggle {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  appearance: none;
  pointer-events: none;
}

/* Mobile: slim header + hamburger menu */
@media (max-width: 767px) {
  .nav-toggle {
    pointer-events: auto; /* allow label to toggle on mobile */
  }
  .header-top {
    display: none;
  }
  .header-main {
    padding: 0.5rem var(--space-md);
  }
  .header-main .container {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .site-logo {
    font-size: 1.0625rem;
    order: 1;
  }
  .nav-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-left: auto;
    order: 2;
    color: var(--color-text);
    background: none;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    padding: 0;
  }
  .nav-toggle-btn:hover {
    background: var(--color-bg-card);
    color: var(--color-text);
  }
  .nav-toggle-btn__bars {
    display: flex;
    flex-direction: column;
    gap: 5px;
  }
  .nav-toggle-btn__bars span {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: var(--transition);
  }
  .nav-toggle:focus-visible + .nav-toggle-btn {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }
  .nav-toggle:checked + .nav-toggle-btn .nav-toggle-btn__bars span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle:checked + .nav-toggle-btn .nav-toggle-btn__bars span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle:checked + .nav-toggle-btn .nav-toggle-btn__bars span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  .nav-main {
    display: none;
    order: 10;
    width: 100%;
    flex-basis: 100%;
    flex-direction: column;
    padding: 0;
    margin: 0.5rem 0 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }
  .nav-toggle:checked ~ .nav-main {
    display: flex;
  }
  .nav-main a {
    display: block;
    padding: 0.75rem var(--space-lg);
    border-radius: 0;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-main a:hover {
    background: var(--color-bg-card);
  }
  .nav-dropdown {
    position: static;
  }
  .nav-dropdown > a {
    border-bottom: none;
  }
  .nav-dropdown__menu {
    position: static;
    opacity: 1;
    visibility: visible;
    min-width: auto;
    padding: 0;
    margin: 0;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    max-height: none;
  }
  .nav-dropdown__menu a {
    padding: 0.625rem var(--space-lg) 0.625rem 2rem;
    font-size: 0.9375rem;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-dropdown__menu a:last-child {
    border-bottom: none;
  }
  .header-ctas {
    order: 3;
  }
  .header-ctas .btn--outline {
    display: none;
  }
  .header-ctas .btn--accent {
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
  }
}

@media (min-width: 768px) {
  .nav-toggle-btn {
    display: none;
  }
}