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

:root {
  /* Color palette - tailored for a clean, trustworthy construction brand */
  --color-background: #f5f7fa;
  --color-surface: #ffffff;
  --color-text: #1e2933;
  --color-text-muted: #6b7280;

  /* Primary accent inspired by professional construction/engineering tones */
  --color-primary: #004b8d; /* deep, trustworthy blue */
  --color-primary-soft: #e3edf7;
  --color-primary-strong: #003566;

  --color-success: #1b9a5a;
  --color-success-soft: #e3f6ec;

  --color-warning: #e9a23b;
  --color-warning-soft: #fff4e3;

  --color-danger: #c53030;
  --color-danger-soft: #fde8e8;

  /* Neutral greys */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2933;
  --color-gray-900: #111827;

  /* Typography */
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-family-heading: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", 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: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.125rem; /* 2px */
  --space-2: 0.25rem;  /* 4px */
  --space-3: 0.375rem; /* 6px */
  --space-4: 0.5rem;   /* 8px */
  --space-5: 0.625rem; /* 10px */
  --space-6: 0.75rem;  /* 12px */
  --space-8: 1rem;     /* 16px */
  --space-10: 1.25rem; /* 20px */
  --space-12: 1.5rem;  /* 24px */
  --space-16: 2rem;    /* 32px */
  --space-20: 2.5rem;  /* 40px */
  --space-24: 3rem;    /* 48px */
  --space-32: 4rem;    /* 64px */
  --space-40: 5rem;    /* 80px */
  --space-48: 6rem;    /* 96px */

  /* Radii */
  --radius-sm: 0.25rem;  /* 4px */
  --radius-md: 0.5rem;   /* 8px */
  --radius-lg: 0.75rem;  /* 12px */
  --radius-xl: 1rem;     /* 16px */
  --radius-full: 9999px;

  /* Shadows - subtle and professional */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 30px rgba(15, 23, 42, 0.12);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;
  --transition-slow: 250ms ease;

  /* Layout */
  --container-max-width: 72rem; /* 1152px */
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  :root {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========================================================================== */
/* 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,
iframe {
  max-width: 100%;
  height: auto;
  display: block;
}

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

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

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
}

legend {
  padding: 0;
}

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

/* Remove list styles on ul, ol elements with a class attribute */
ul[class],
ol[class] {
  list-style: none;
}

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

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

main {
  min-height: 60vh;
}

h1,
 h2,
 h3,
 h4,
 h5,
 h6 {
  font-family: var(--font-family-heading);
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); margin-bottom: var(--space-12); }
h2 { font-size: var(--font-size-3xl); margin-bottom: var(--space-10); }
h3 { font-size: var(--font-size-2xl); margin-bottom: var(--space-8); }
h4 { font-size: var(--font-size-xl);  margin-bottom: var(--space-6); }
h5 { font-size: var(--font-size-lg);  margin-bottom: var(--space-4); }
h6 { font-size: var(--font-size-base); margin-bottom: var(--space-3); }

p {
  margin-bottom: var(--space-6);
  color: var(--color-text-muted);
}

strong {
  font-weight: 600;
}

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

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

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

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

hr {
  border: 0;
  border-top: 1px solid var(--color-gray-200);
  margin: var(--space-16) 0;
}

/* ========================================================================== */
/* Accessibility                                                             */
/* ========================================================================== */

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

/* 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;
}

.sr-only-focusable:active,
.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

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

/* Layout container for structured pages */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-12);
  padding-right: var(--space-12);
}

@media (max-width: 640px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

.section {
  padding-top: var(--space-32);
  padding-bottom: var(--space-32);
}

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

/* Flex helpers */
.flex {
  display: flex;
}

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

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

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

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

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

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

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

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

.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }

/* Grid helpers */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-12);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-12);
}

@media (max-width: 900px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

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

.m-auto { margin: auto; }

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }

.pt-0 { padding-top: 0; }
.pt-8 { padding-top: var(--space-8); }
.pt-12 { padding-top: var(--space-12); }
.pt-16 { padding-top: var(--space-16); }

.pb-0 { padding-bottom: 0; }
.pb-8 { padding-bottom: var(--space-8); }
.pb-12 { padding-bottom: var(--space-12); }
.pb-16 { padding-bottom: var(--space-16); }

/* Utility for subtle section labels (e.g., process steps, service tags) */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background-color: var(--color-primary-soft);
  color: var(--color-primary-strong);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-weight: 500;
  font-size: var(--font-size-sm);
  line-height: 1.2;
  cursor: pointer;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff !important;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
  background-color: #ffffff;
  color: var(--color-primary-strong);
  border-color: var(--color-gray-200);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

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

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

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

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

/* Form controls */
.input,
.select,
.textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-gray-300);
  background-color: #ffffff;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  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-primary);
  box-shadow: 0 0 0 1px var(--color-primary-soft);
  outline: none;
}

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

.label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.field-help {
  margin-top: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Card - for services, project examples, testimonials */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-12);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-gray-100);
}

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

.card-header {
  margin-bottom: var(--space-6);
}

.card-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

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

/* Simple pill tag, often useful for status or service type labels */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

/* Process step layout helper (for "How we work" timeline style) */
.process-step {
  position: relative;
  padding-left: 2.5rem;
}

.process-step-number {
  position: absolute;
  left: 0;
  top: 0.1rem;
  width: 1.75rem;
  height: 1.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background-color: var(--color-primary-soft);
  color: var(--color-primary-strong);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* Testimonials quote style */
.testimonial-quote {
  position: relative;
  padding-left: var(--space-10);
  font-style: italic;
}

.testimonial-quote::before {
  content: "\201C";
  position: absolute;
  left: 0;
  top: -0.5rem;
  font-size: 3rem;
  line-height: 1;
  color: var(--color-gray-200);
}

/* Simple responsive two-column layout for text + image sections */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: var(--space-16);
  align-items: center;
}

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

/* Site header & footer base (kept minimal so pages can extend) */
.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--color-gray-100);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.site-nav a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding-bottom: 0.1rem;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover {
  color: var(--color-text);
}

.site-nav a[aria-current="page"] {
  color: var(--color-primary-strong);
  border-bottom-color: var(--color-primary-strong);
}

.site-footer {
  background-color: #0b1520;
  color: #d1d5db;
  padding-top: var(--space-20);
  padding-bottom: var(--space-10);
}

.site-footer a {
  color: #e5e7eb;
}

.site-footer a:hover {
  color: #ffffff;
}

.site-footer-small {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(148, 163, 184, 0.3);
  font-size: var(--font-size-xs);
  color: #9ca3af;
}