/* ==========================================================================
   AC Repair Service Nagercoil - Core Design System & Styles
   Domain: acrepairservicenagercoil.com
   Clean, fast-loading, mobile-first vanilla CSS design system
   ========================================================================== */

:root {
  /* Color Palette - Fresh cooling HVAC tones */
  --color-primary: #0369a1;        /* Cool ocean blue */
  --color-primary-dark: #075985;   /* Deep ocean */
  --color-primary-light: #e0f2fe;  /* Ice frost tint */
  --color-secondary: #0f766e;      /* Fresh teal */
  --color-accent: #f59e0b;         /* Warm amber for key highlights */
  --color-dark: #0f172a;           /* Deep slate text */
  --color-dark-light: #334155;     /* Medium slate */
  --color-muted: #64748b;          /* Soft gray */
  --color-light-bg: #f8fafc;       /* Clean page background */
  --color-white: #ffffff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-whatsapp: #25d366;
  --color-whatsapp-dark: #128c7e;
  --color-call: #0284c7;

  /* Typography */
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 1rem;          /* 16px */
  --line-height-base: 1.6;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-card: 0 2px 8px rgba(15, 23, 42, 0.04);

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Layout */
  --container-max-width: 1200px;
  --container-padding: 1.25rem;
  --section-spacing: 4.5rem;
  --section-spacing-mobile: 3rem;
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-dark);
  background-color: var(--color-light-bg);
  overflow-x: hidden;
  padding-bottom: 70px; /* Space for mobile sticky CTA bar */
}

@media (min-width: 769px) {
  body {
    padding-bottom: 0;
  }
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: var(--color-primary-dark);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

ul, ol {
  list-style-position: inside;
}

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

.section {
  padding-top: var(--section-spacing-mobile);
  padding-bottom: var(--section-spacing-mobile);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--section-spacing);
    padding-bottom: var(--section-spacing);
  }
}

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

.section-bg-alt {
  background-color: #f1f5f9;
}

.section-bg-cool {
  background: linear-gradient(180deg, #f0f9ff 0%, #ffffff 100%);
}

/* Headings & Section Headers */
.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 2.5rem auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 1.85rem;
  line-height: 1.25;
  color: var(--color-dark);
  font-weight: 700;
  margin-bottom: 0.85rem;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 2.35rem;
  }
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-muted);
  line-height: 1.55;
}

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.98rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  text-decoration: none;
  line-height: 1.2;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

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

.btn-whatsapp:hover {
  background-color: var(--color-whatsapp-dark);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.25);
}

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

.btn-outline:hover {
  background-color: var(--color-light-bg);
  border-color: var(--color-muted);
  color: var(--color-dark);
}

.btn-sm {
  padding: 0.5rem 0.9rem;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 0.95rem 1.8rem;
  font-size: 1.08rem;
}

/* Badge styles */
.badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: #e2e8f0;
  color: var(--color-dark-light);
}

.badge-blue {
  background-color: #e0f2fe;
  color: #0369a1;
}

.badge-teal {
  background-color: #ccfbf1;
  color: #0f766e;
}

.badge-amber {
  background-color: #fef3c7;
  color: #92400e;
}

/* Accessibility & Screen Reader */
.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;
}