/* ============================================================
   GENERAL DIESEL SERVICE — Mobile-First Stylesheet
   ============================================================ */

/* --- 1.1 Custom Properties --- */
:root {
  --color-primary: #1a73e8;
  --color-primary-dark: #1557b0;
  --color-accent: #ff6d00;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f7fa;
  --color-text: #1a1a2e;
  --color-text-light: #6b7280;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-whatsapp: #25d366;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  --font-size-3xl: 36px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

  --max-width: 1200px;
  --header-height: 60px;
  --cta-height: 64px;
}

/* --- 1.2 Mobile-First Base Styles --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  padding-bottom: var(--cta-height);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  color: var(--color-text);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* --- 1.3 Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  display: flex;
  align-items: center;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--color-text);
  text-decoration: none;
}

.logo img {
  height: 36px;
  width: auto;
}

.nav {
  display: none;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.3s;
}

.lang-switcher {
  display: flex;
  gap: 2px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-full);
  padding: 2px;
}

.lang-btn {
  padding: 6px 12px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.lang-btn.active {
  background: var(--color-primary);
  color: #fff;
}

/* Mobile nav overlay */
.nav-overlay {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 99;
  padding: var(--space-lg);
}

.nav-overlay.active {
  display: block;
}

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

.nav-overlay a {
  display: block;
  padding: var(--space-md);
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background 0.2s;
}

.nav-overlay a:hover {
  background: var(--color-bg-alt);
  text-decoration: none;
}

/* --- 1.4 Hero Section --- */
.hero {
  margin-top: var(--header-height);
  padding: var(--space-3xl) 0 var(--space-2xl);
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #fff;
  text-align: center;
}

.hero h1 {
  font-size: var(--font-size-2xl);
  color: #fff;
  margin-bottom: var(--space-md);
}

.hero-subtitle {
  font-size: var(--font-size-base);
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--space-lg);
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.hero-cta a,
.hero-cta button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.hero-cta a:hover,
.hero-cta button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

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

.btn-whatsapp {
  background: var(--color-whatsapp);
  color: #fff;
}

.hero-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.7);
}

.hero-rating {
  font-weight: 600;
  color: #fbbf24;
}

/* --- 1.5 Service Cards --- */
.services {
  padding: var(--space-2xl) 0;
}

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

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

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  transition: box-shadow 0.2s, transform 0.2s;
  text-decoration: none;
  color: var(--color-text);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
}

.card-icon {
  font-size: 32px;
  margin-bottom: var(--space-sm);
}

.card-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.services-extra {
  display: none;
  margin-top: var(--space-md);
}

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

.btn-more {
  display: block;
  width: 100%;
  padding: var(--space-md);
  margin-top: var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: background 0.2s;
}

.btn-more:hover {
  background: var(--color-border);
}

/* --- 1.6 Sticky CTA --- */
.sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--cta-height);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  display: flex;
  z-index: 100;
  box-shadow: 0 -2px 8px rgba(0,0,0,0.08);
}

.sticky-cta a,
.sticky-cta button {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
}

.sticky-cta .cta-phone {
  background: var(--color-primary);
  color: #fff;
}

.sticky-cta .cta-whatsapp {
  background: var(--color-whatsapp);
  color: #fff;
}

/* --- 1.7 Why Us --- */
.why-us {
  padding: var(--space-2xl) 0;
  background: var(--color-bg-alt);
}

.why-us-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  text-align: center;
}

.why-us-item {
  padding: var(--space-lg);
}

.why-us-icon {
  font-size: 36px;
  margin-bottom: var(--space-sm);
}

.why-us-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.why-us-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* --- 1.8 Contact / Footer --- */
.contact {
  padding: var(--space-2xl) 0;
}

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

.contact-info h3,
.contact-schedule h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
}

.contact-info p {
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-sm);
}

.contact-info a {
  color: var(--color-primary);
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
}

.schedule-table td {
  padding: var(--space-sm) 0;
  font-size: var(--font-size-sm);
  border-bottom: 1px solid var(--color-border);
}

.schedule-table td:last-child {
  text-align: right;
  font-weight: 600;
}

.btn-map {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  margin-top: var(--space-md);
  transition: background 0.2s;
}

.btn-map:hover {
  background: var(--color-border);
  text-decoration: none;
}

/* --- 1.9 Service Page Template --- */
.service-page {
  margin-top: var(--header-height);
  padding: var(--space-xl) 0;
}

.service-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
}

.btn-back:hover {
  background: var(--color-border);
  text-decoration: none;
}

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

.service-section {
  margin-bottom: var(--space-xl);
}

.service-section h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
}

.symptoms-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.symptoms-list li {
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.symptoms-list li::before {
  content: "•";
  color: var(--color-primary);
  font-weight: 700;
}

.prices-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.price-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}

.price-row:last-child {
  border-bottom: none;
}

.price-value {
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

/* --- 1.10 Form Styles --- */
.booking-form {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.booking-form h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-lg);
}

.form-group {
  margin-bottom: var(--space-md);
}

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  transition: border-color 0.2s;
}

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

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-group.error input,
.form-group.error textarea {
  border-color: #ef4444;
}

.form-error {
  display: none;
  font-size: var(--font-size-xs);
  color: #ef4444;
  margin-top: var(--space-xs);
}

.form-group.error .form-error {
  display: block;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.btn-submit {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

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

.form-success {
  display: none;
  text-align: center;
  padding: var(--space-xl);
}

.form-success.active {
  display: block;
}

.form-success h3 {
  color: var(--color-success);
  margin-bottom: var(--space-md);
}

/* --- 1.11 Responsive Breakpoints --- */

/* Tablet: 768px+ */
@media (min-width: 768px) {
  .hero h1 {
    font-size: var(--font-size-3xl);
  }

  .hero-cta {
    flex-direction: row;
    justify-content: center;
  }

  .hero-meta {
    flex-direction: row;
    justify-content: center;
    gap: var(--space-md);
  }

  .cards-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .services-extra.active {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
  .nav {
    display: flex;
    gap: var(--space-lg);
  }

  .nav-toggle {
    display: none;
  }

  .nav a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    padding: var(--space-sm) 0;
    position: relative;
  }

  .nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
  }

  .nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform 0.2s;
  }

  .nav a:hover::after {
    transform: scaleX(1);
  }

  .hero {
    padding: var(--space-3xl) 0;
  }
}

/* Large desktop: 1200px+ */
@media (min-width: 1200px) {
  .container {
    padding: 0 var(--space-xl);
  }
}