/* ========================================================================
   Variables
   ======================================================================== */

:root {
  /* Color Palette - Plumbing, Heating & Air-Conditioning Theme */
  --color-background: #f5f7fa; /* light, clean backdrop */
  --color-surface: #ffffff;
  --color-text: #1c2530;
  --color-text-muted: #6b7480;

  --color-primary: #145da0; /* trustworthy blue */
  --color-primary-soft: #e4effa;
  --color-primary-dark: #0d3d6d;

  --color-accent-warm: #f78c3d; /* warm flame orange */
  --color-accent-teal: #1fafb6; /* fresh teal */

  --color-success: #198754;
  --color-warning: #f5a623;
  --color-danger: #d7263d;

  /* Neutral Grays */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f1f3f5;
  --color-gray-200: #e1e5eb;
  --color-gray-300: #cbd2dd;
  --color-gray-400: #a5afbf;
  --color-gray-500: #7e8aa0;
  --color-gray-600: #5a6475;
  --color-gray-700: #3c4452;
  --color-gray-800: #262c36;
  --color-gray-900: #151921;

  /* Status Backgrounds */
  --color-success-soft: #e3f6ed;
  --color-warning-soft: #fff3d9;
  --color-danger-soft: #ffe5ea;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont,
    Roboto, "Helvetica Neue", Arial, sans-serif;

  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */
  --font-size-5xl: 3rem;     /* 48px */

  --line-height-tight: 1.2;
  --line-height-snug: 1.35;
  --line-height-normal: 1.6;

  /* Spacing Scale (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-pill: 999px;

  /* Shadows - crisp, professional */
  --shadow-sm: 0 4px 10px rgba(8, 15, 30, 0.06);
  --shadow-md: 0 10px 25px rgba(8, 15, 30, 0.08);
  --shadow-lg: 0 18px 40px rgba(8, 15, 30, 0.12);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 200ms ease-out;
  --transition-slow: 320ms ease-out;

  /* Layout */
  --container-width: 1120px;
  --container-padding-x: var(--space-4);
}

@media (min-width: 768px) {
  :root {
    --container-padding-x: var(--space-6);
  }
}

/* ========================================================================
   Reset / Normalize
   ======================================================================== */

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

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

body {
  margin: 0;
}

h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  border: none;
  background: none;
  padding: 0;
}

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

table {
  border-collapse: collapse;
  border-spacing: 0;
}

[hidden] {
  display: none !important;
}

/* ========================================================================
   Base Styles
   ======================================================================== */

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-gray-900);
  margin-bottom: var(--space-3);
}

h1 {
  font-size: clamp(2.25rem, 3vw, 3rem);
}

h2 {
  font-size: clamp(1.875rem, 2.4vw, 2.25rem);
}

h3 {
  font-size: clamp(1.5rem, 2vw, 1.875rem);
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--space-3);
  color: var(--color-text-muted);
}

p:last-child {
  margin-bottom: 0;
}

strong,
b {
  font-weight: 600;
}

small {
  font-size: var(--font-size-sm);
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
}

hr {
  border: 0;
  border-top: 1px solid var(--color-gray-200);
  margin: var(--space-6) 0;
}

/* Links - subtle, professional */

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

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

a:focus-visible {
  outline: 3px solid var(--color-accent-teal);
  outline-offset: 2px;
}

/* Lists */
ul,
ol {
  padding-left: 1.25rem;
  margin-bottom: var(--space-3);
}

li + li {
  margin-top: 0.25rem;
}

/* ========================================================================
   Accessibility & Motion
   ======================================================================== */

:focus-visible {
  outline: 3px solid var(--color-accent-teal);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================================================================
   Utilities
   ======================================================================== */

/* Layout Containers */

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding-x);
  padding-right: var(--container-padding-x);
}

.section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.section--muted {
  background-color: var(--color-gray-50);
}

/* Flex Helpers */

.flex {
  display: flex;
}

.flex-inline {
  display: inline-flex;
}

.flex-row {
  flex-direction: row;
}

.flex-column {
  flex-direction: column;
}

.flex-center {
  justify-content: center;
  align-items: center;
}

.flex-between {
  justify-content: space-between;
}

.flex-wrap {
  flex-wrap: wrap;
}

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

.justify-center {
  justify-content: center;
}

.gap-2 {
  gap: var(--space-2);
}

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

/* Grid Helpers */

.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Spacing Utilities (common subset) */

.mt-0 { margin-top: 0 !important; }
.mt-2 { margin-top: var(--space-2) !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-6 { margin-top: var(--space-6) !important; }
.mt-8 { margin-top: var(--space-8) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-2 { margin-bottom: var(--space-2) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-6 { margin-bottom: var(--space-6) !important; }
.mb-8 { margin-bottom: var(--space-8) !important; }

.pt-4 { padding-top: var(--space-4) !important; }
.pt-6 { padding-top: var(--space-6) !important; }
.pt-8 { padding-top: var(--space-8) !important; }

.pb-4 { padding-bottom: var(--space-4) !important; }
.pb-6 { padding-bottom: var(--space-6) !important; }
.pb-8 { padding-bottom: var(--space-8) !important; }

/* Text Utilities */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }

/* Screen Reader Only */

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

/* ========================================================================
   Components
   ======================================================================== */

/* Buttons - solid, trustworthy primary with warm accent alternative */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-pill);
  font-weight: 500;
  font-size: var(--font-size-sm);
  line-height: 1.1;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base),
    transform var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent-warm), #ffb15f);
  color: #1b2836;
  box-shadow: var(--shadow-sm);
}

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

.btn-outline:hover {
  background-color: var(--color-primary-soft);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.65;
  box-shadow: none;
}

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

/* Form Inputs - clean, consistent */

.input,
select,
textarea {
  width: 100%;
  padding: 0.65rem 0.8rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-300);
  background-color: #ffffff;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
}

.input::placeholder,
textarea::placeholder {
  color: var(--color-gray-400);
}

.input:focus,
select:focus,
textarea:focus {
  border-color: var(--color-accent-teal);
  box-shadow: 0 0 0 1px var(--color-accent-teal), var(--shadow-sm);
  outline: none;
}

.input[aria-invalid="true"],
.input--error {
  border-color: var(--color-danger);
}

label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 500;
  font-size: var(--font-size-sm);
  color: var(--color-gray-800);
}

.form-group {
  margin-bottom: var(--space-4);
}

/* Card - used for service blocks, callouts, etc. */

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
}

.card--subtle {
  box-shadow: none;
  border: 1px solid var(--color-gray-200);
}

.card-header {
  margin-bottom: var(--space-3);
}

.card-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-1);
}

.card-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Tag / Pill (e.g., 24/7 Emergency Callout) */

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.tag--warm {
  background-color: var(--color-accent-warm);
  color: #1b2836;
}

.tag--cool {
  background-color: var(--color-accent-teal);
  color: #ffffff;
}

/* Notice Banner (for assurances, certifications) */

.notice {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
}

.notice--info {
  background-color: var(--color-primary-soft);
  color: var(--color-gray-800);
}

.notice--success {
  background-color: var(--color-success-soft);
  color: var(--color-gray-800);
}

.notice--warning {
  background-color: var(--color-warning-soft);
  color: var(--color-gray-900);
}

.notice--danger {
  background-color: var(--color-danger-soft);
  color: var(--color-gray-900);
}

/* Hero Utility - for top section imagery/text */

.hero {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.hero--split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: var(--space-10);
  align-items: center;
}

@media (max-width: 900px) {
  .hero--split {
    grid-template-columns: 1fr;
  }
}

.hero-kicker {
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-accent-teal);
  margin-bottom: var(--space-2);
}

.hero-heading {
  font-size: clamp(2.25rem, 3.2vw, 3rem);
  margin-bottom: var(--space-3);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

/* Footer base */

.site-footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-100);
  padding-top: var(--space-10);
  padding-bottom: var(--space-8);
  font-size: var(--font-size-sm);
}

.site-footer a {
  color: var(--color-gray-100);
}

.site-footer a:hover {
  color: var(--color-accent-teal);
}