/* ==========================================================================
   ARLASE OIL SERVICES — Landing Page Styles
   Brand: #FEAD2A (orange) + #000 (black)
   Mobile-first responsive design
   ========================================================================== */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-primary: #FEAD2A;
  --color-primary-dark: #e09a20;
  --color-primary-light: #ffc857;
  --color-text: #1a1a1a;
  --color-text-light: #555;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f8f8;
  --color-bg-dark: #1a1a1a;
  --color-white: #ffffff;
  --color-overlay: rgba(0, 0, 0, 0.55);

  /* Typography */
  --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --line-height: 1.6;
  --line-height-sm: 1.4;
  --line-height-lg: 1.8;
  --letter-spacing: 0.02em;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --container-max: 1200px;
  --container-padding: var(--space-md);
  --header-height: 72px;

  /* Borders & Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

address {
  font-style: normal;
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-center {
  text-align: center;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-sm);
  margin: 0 0 var(--space-md);
  font-weight: 700;
}

p {
  margin: 0 0 var(--space-md);
}

.lead {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-base);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-bg-dark);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
}

/* --- Section Shared --- */
.section {
  padding-block: var(--space-4xl) var(--space-4xl);
}

.section-title {
  font-size: var(--font-size-3xl);
  text-align: center;
  margin-bottom: var(--space-lg);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background-color: var(--color-primary);
  margin: var(--space-sm) auto 0;
  border-radius: var(--radius-full);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  font-size: var(--font-size-lg);
  margin-top: calc(-1 * var(--space-sm));
  margin-bottom: var(--space-2xl);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-link {
  display: flex;
  align-items: center;
  z-index: 101;
}

.logo-link img {
  height: 40px;
  width: auto;
}

.main-nav ul {
  display: none;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing);
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  z-index: 101;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav overlay */
.main-nav.is-open ul {
  display: flex;
  flex-direction: column;
  position: fixed;
  inset: 0;
  background-color: var(--color-white);
  justify-content: center;
  align-items: center;
  gap: var(--space-2xl);
}

.main-nav.is-open .nav-link {
  font-size: var(--font-size-2xl);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  color: var(--color-white);
  text-align: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.45) 0%,
    rgba(0, 0, 0, 0.25) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-block: var(--space-3xl);
}

.hero-logo {
  margin: 0 auto var(--space-xl);
  max-width: 220px;
  filter: brightness(0) invert(1);
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  margin-bottom: var(--space-md);
  line-height: 1.15;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xl);
  opacity: 0.9;
  max-width: 600px;
  margin-inline: auto;
}

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

.about-intro {
  display: grid;
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.about-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  width: 100%;
  object-fit: cover;
}

.mv-grid {
  display: grid;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.mv-card {
  text-align: center;
  padding: var(--space-xl);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.mv-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.mv-icon {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.mv-card h3 {
  font-size: var(--font-size-xl);
  color: var(--color-bg-dark);
}

.mv-card p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Values */
.values {
  text-align: center;
}

.values-title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-lg);
}

.values-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

.value-badge {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  background-color: var(--color-primary);
  color: var(--color-bg-dark);
  font-weight: 600;
  font-size: var(--font-size-sm);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.value-badge:hover {
  background-color: var(--color-primary-dark);
  transform: scale(1.05);
}

/* ==========================================================================
   Services Section
   ========================================================================== */
.services {
  background-color: var(--color-bg-alt);
}

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

.service-card {
  padding: var(--space-xl);
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.service-icon {
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.service-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.service-card p {
  color: var(--color-text-light);
  margin-bottom: 0;
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Equipment Section
   ========================================================================== */
.equipment {
  background-color: var(--color-bg);
}

.equipment-grid {
  display: grid;
  gap: var(--space-2xl);
}

.equipment-card {
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.equipment-card:hover {
  box-shadow: var(--shadow-md);
}

.equipment-card img {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

.equipment-info {
  padding: var(--space-xl);
}

.equipment-info h3 {
  font-size: var(--font-size-xl);
  color: var(--color-bg-dark);
  margin-bottom: var(--space-sm);
}

.equipment-info p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.equipment-info ul {
  padding-left: var(--space-lg);
  list-style: disc;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

.equipment-info li {
  margin-bottom: var(--space-xs);
}

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

.contact-grid {
  display: grid;
  gap: var(--space-2xl);
}

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

.contact-item h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-bg-dark);
}

.contact-item h3 svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-item address,
.contact-item p {
  color: var(--color-text-light);
  line-height: var(--line-height-lg);
}

.contact-link {
  color: var(--color-primary-dark);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.contact-link:hover {
  color: var(--color-primary);
}

.contact-map {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.contact-map iframe {
  width: 100%;
  height: 300px;
  display: block;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-bg-dark);
  color: var(--color-white);
  padding-block: var(--space-2xl);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
  text-align: center;
}

.footer-brand img {
  margin: 0 auto var(--space-sm);
  max-width: 160px;
  filter: brightness(0) invert(1);
}

.footer-brand p {
  margin: 0;
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-lg);
}

.footer-nav a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing);
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   Responsive: Tablet (≥768px)
   ========================================================================== */
@media (min-width: 48rem) {
  :root {
    --container-padding: var(--space-xl);
  }

  .nav-toggle {
    display: none;
  }

  .main-nav ul {
    display: flex;
  }

  .hero-title {
    font-size: var(--font-size-5xl);
  }

  .hero-logo {
    max-width: 280px;
  }

  .about-intro {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

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

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .contact-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .contact-map iframe {
    height: 100%;
    min-height: 350px;
  }
}

/* ==========================================================================
   Responsive: Desktop (≥1024px)
   ========================================================================== */
@media (min-width: 64rem) {
  .section {
    padding-block: var(--space-3xl);
  }

  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .equipment-card img {
    height: 300px;
  }
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */
@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;
  }
}

/* ==========================================================================
    Compliance Section
    ========================================================================== */
.compliance-grid {
  display: grid;
  gap: var(--space-2xl);
  align-items: start;
}

.compliance-form-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-2xl);
}

.compliance-card-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  color: var(--color-bg-dark);
  margin-bottom: var(--space-xl);
}

.compliance-card-title svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.compliance-info {
  padding: var(--space-xl);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-lg);
}

.compliance-commitment {
  font-size: var(--font-size-base);
  line-height: var(--line-height-lg);
  color: var(--color-text);
  margin-bottom: var(--space-xl);
}

.compliance-commitment strong {
  color: var(--color-bg-dark);
}

.compliance-info-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  color: var(--color-bg-dark);
  margin-bottom: var(--space-sm);
  margin-top: var(--space-xl);
}

.compliance-info-title:first-of-type {
  margin-top: 0;
}

.compliance-info-title svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.compliance-list {
  list-style: disc;
  padding-left: var(--space-lg);
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

.compliance-list li {
  margin-bottom: var(--space-xs);
  line-height: var(--line-height);
}

.compliance-list a {
  color: var(--color-primary-dark);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.compliance-list a:hover {
  color: var(--color-primary);
}

/* Form styles */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-bg-dark);
  margin-bottom: var(--space-xs);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 2px solid #e0e0e0;
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(254, 173, 42, 0.2);
}

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

.form-group--checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.form-group--checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.form-group--checkbox label {
  font-weight: 400;
  color: var(--color-text-light);
  margin-bottom: 0;
  cursor: pointer;
}

.btn-full {
  width: 100%;
}

.form-message {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  line-height: var(--line-height);
  margin-top: var(--space-lg);
  text-align: center;
}

.form-message--success {
  background-color: #e8f5e9;
  color: #2e7d32;
  border: 1px solid #a5d6a7;
}

.form-message--error {
  background-color: #ffebee;
  color: #c62828;
  border: 1px solid #ef9a9a;
}

/* ==========================================================================
    Responsive: Tablet (≥768px)
    ========================================================================== */
@media (min-width: 48rem) {
  .compliance-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
  }

  .compliance-info {
    padding: var(--space-2xl);
  }
}

/* ==========================================================================
    Print
    ========================================================================== */
@media print {
  .site-header,
  .nav-toggle,
  .hero-overlay,
  .hero-bg,
  .contact-map,
  .site-footer {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: var(--space-xl) 0;
    color: var(--color-text);
  }

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

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
  }
}