/* ============================================
   KEYSTONE CIVIL LLC — CORE STYLES
   Palette: Charcoal #14181C, Steel Blue #2C4A5E, 
            Steel Blue Light #3E6B85, Amber #D98E2D, Off-white #EDEEEE
   Type: Oswald (display/headers), Inter (body)
   ============================================ */

:root {
  --charcoal: #14181C;
  --charcoal-2: #1C2227;
  --steel: #2C4A5E;
  --steel-light: #3E6B85;
  --steel-pale: #C9D6DD;
  --amber: #D98E2D;
  --amber-dark: #B8741C;
  --off-white: #EDEEEE;
  --white: #FFFFFF;
  --gray-mid: #5C666D;
  --gray-line: #2E3942;

  --font-display: 'Oswald', 'Arial Narrow', Arial, sans-serif;
  --font-body: 'Inter', -apple-system, 'Segoe UI', Roboto, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--off-white);
  color: var(--charcoal);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.15;
  color: var(--charcoal);
}
h1 { font-weight: 600; }
h2 { font-weight: 600; }

.eyebrow {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 13px;
  color: var(--amber);
  font-weight: 500;
  margin-bottom: 14px;
  display: block;
}

/* ============ HEADER / NAV ============ */
.site-header {
  background: var(--charcoal);
  position: sticky;
  top: 0;
  z-index: 500;
  border-bottom: 1px solid var(--gray-line);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 78px; }

.logo {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo span { color: var(--amber); }
.logo small {
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--gray-mid);
  text-transform: uppercase;
  font-weight: 400;
}

.nav-links { display: flex; gap: 36px; align-items: center; }
.nav-links a {
  color: var(--steel-pale);
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 400;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--white); }
.nav-links a.active { color: var(--amber); }

.nav-cta {
  background: var(--amber);
  color: var(--charcoal) !important;
  padding: 11px 22px;
  font-weight: 600;
  border-radius: 2px;
}
.nav-cta:hover { background: var(--amber-dark); color: var(--white) !important; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; width: 28px; background: none; }
.nav-toggle span { height: 2px; background: var(--white); width: 100%; }

/* ============ BUTTONS ============ */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 14px;
  font-weight: 600;
  padding: 16px 34px;
  border-radius: 2px;
  transition: all 0.2s ease;
}
.btn-primary { background: var(--amber); color: var(--charcoal); }
.btn-primary:hover { background: var(--amber-dark); color: var(--white); }
.btn-outline { background: transparent; color: var(--white); border: 1.5px solid var(--steel-light); }
.btn-outline:hover { border-color: var(--amber); color: var(--amber); }
.btn-dark { background: var(--charcoal); color: var(--white); }
.btn-dark:hover { background: var(--steel); }

/* ============ HERO ============ */
.hero { background: linear-gradient(135deg, var(--charcoal) 0%, var(--steel) 100%); position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; align-items: center; min-height: 640px; }
.hero-content { padding: 100px 0 100px 24px; max-width: 580px; margin-left: auto; position: relative; z-index: 2; }
.hero-content h1 { color: var(--white); font-size: 50px; margin-bottom: 22px; }
.hero-content h1 em { color: var(--amber); font-style: normal; }
.hero-content p { color: var(--steel-pale); font-size: 18px; margin-bottom: 34px; max-width: 480px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual { position: relative; height: 100%; min-height: 640px; background: var(--charcoal-2); overflow: hidden; }
.bore-diagram { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ============ STAT BAR ============ */
.stat-bar { background: var(--charcoal-2); border-top: 1px solid var(--gray-line); border-bottom: 1px solid var(--gray-line); padding: 36px 0; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); text-align: center; }
.stat-grid div + div { border-left: 1px solid var(--gray-line); }
.stat-num { font-family: var(--font-display); font-size: 36px; color: var(--amber); font-weight: 600; }
.stat-label { font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--steel-pale); margin-top: 4px; }

/* ============ SECTIONS ============ */
section { padding: 88px 0; }
.section-dark { background: var(--charcoal); color: var(--white); }
.section-dark h2 { color: var(--white); }
.section-steel { background: var(--steel); color: var(--white); }
.section-steel h2 { color: var(--white); }

.section-head { max-width: 640px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: 36px; }
.section-head p { color: var(--gray-mid); font-size: 17px; margin-top: 14px; }
.section-dark .section-head p, .section-steel .section-head p { color: var(--steel-pale); }

/* ============ SERVICE CARDS ============ */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.service-card {
  background: var(--white);
  padding: 38px 32px;
  border-radius: 3px;
  box-shadow: 0 1px 3px rgba(20,24,28,0.08);
  transition: box-shadow 0.2s, transform 0.2s;
}
.service-card:hover { box-shadow: 0 12px 28px rgba(20,24,28,0.14); transform: translateY(-3px); }
.service-icon { width: 52px; height: 52px; margin-bottom: 20px; }
.service-card h3 { font-size: 19px; margin-bottom: 12px; color: var(--steel); }
.service-card p { color: var(--gray-mid); font-size: 15px; }

/* ============ TWO COL ============ */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.feature-list li { display: flex; gap: 16px; margin-bottom: 22px; align-items: flex-start; }
.feature-list .num { font-family: var(--font-display); color: var(--amber); font-size: 22px; font-weight: 600; flex-shrink: 0; width: 36px; }
.feature-list h4 { font-size: 16px; margin-bottom: 4px; color: var(--charcoal); }
.section-dark .feature-list h4 { color: var(--white); }
.feature-list p { font-size: 14px; color: var(--gray-mid); }
.section-dark .feature-list p { color: var(--steel-pale); }

/* ============ ENTITY CHART ============ */
.entity-chart { background: var(--white); border-radius: 4px; padding: 44px; box-shadow: 0 1px 3px rgba(20,24,28,0.08); }

/* ============ CTA BAND ============ */
.cta-band { background: var(--steel); padding: 64px 0; text-align: center; }
.cta-band h2 { color: var(--white); font-size: 30px; margin-bottom: 12px; }
.cta-band p { color: var(--steel-pale); margin-bottom: 30px; font-size: 16px; }

/* ============ FOOTER ============ */
.site-footer { background: var(--charcoal-2); color: var(--steel-pale); padding: 56px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-grid h4 { color: var(--white); font-size: 14px; letter-spacing: 0.08em; margin-bottom: 18px; }
.footer-grid a, .footer-grid p { color: var(--gray-mid); font-size: 14px; display: block; margin-bottom: 10px; }
.footer-grid a:hover { color: var(--amber); }
.footer-bottom {
  border-top: 1px solid var(--gray-line);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--gray-mid);
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ PAGE HEADER ============ */
.page-header { background: linear-gradient(135deg, var(--charcoal) 0%, var(--steel) 100%); padding: 80px 0 56px; }
.page-header h1 { color: var(--white); font-size: 40px; }
.page-header p { color: var(--steel-pale); margin-top: 14px; font-size: 17px; max-width: 600px; }
.breadcrumb { font-size: 13px; color: var(--steel-pale); margin-bottom: 18px; letter-spacing: 0.04em; }
.breadcrumb span { color: var(--amber); }

/* ============ FORMS ============ */
.form-card { background: var(--white); border-radius: 4px; padding: 48px; box-shadow: 0 1px 3px rgba(20,24,28,0.08); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 8px;
}
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 13px 14px;
  border: 1.5px solid #D5D9DB;
  border-radius: 3px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--charcoal);
  background: var(--off-white);
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--steel-light); background: var(--white);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-note { font-size: 13px; color: var(--gray-mid); margin-top: -4px; margin-bottom: 16px; }
.required { color: var(--amber-dark); }

.checkbox-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.checkbox-item { display: flex; align-items: center; gap: 9px; font-size: 14px; color: var(--charcoal); }
.checkbox-item input { width: auto; accent-color: var(--steel); }

.form-status { margin-top: 18px; padding: 14px 16px; border-radius: 3px; font-size: 14px; display: none; }
.form-status.success { background: #E4F0E7; color: #1E5C32; display: block; }
.form-status.error { background: #F5E1DE; color: #8C2E1E; display: block; }

/* ============ TABLES ============ */
.data-table { width: 100%; border-collapse: collapse; background: var(--white); box-shadow: 0 1px 3px rgba(20,24,28,0.08); }
.data-table th {
  background: var(--charcoal);
  color: var(--white);
  text-align: left;
  padding: 14px 18px;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.data-table td { padding: 14px 18px; border-bottom: 1px solid #E5E7E8; font-size: 14px; color: var(--charcoal); }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:nth-child(even) { background: #F6F7F7; }

/* ============ WORK CARDS ============ */
.work-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.work-card { background: var(--white); border-radius: 3px; overflow: hidden; box-shadow: 0 1px 3px rgba(20,24,28,0.08); }
.work-card-img { height: 220px; background: var(--steel); position: relative; overflow: hidden; }
.work-card-body { padding: 26px 28px; }
.work-tag {
  display: inline-block;
  background: var(--off-white);
  color: var(--steel);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 2px;
  font-weight: 600;
  margin-bottom: 12px;
}
.work-card h3 { font-size: 18px; color: var(--charcoal); margin-bottom: 8px; }
.work-card p { font-size: 14px; color: var(--gray-mid); }

/* ============ PROCESS TIMELINE ============ */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.process-step { text-align: center; padding: 0 16px; position: relative; }
.process-num {
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--steel); color: var(--white);
  font-family: var(--font-display); font-size: 22px; font-weight: 600;
  display: flex; align-items: center; justify-content: center; margin: 0 auto 18px;
}
.process-step h4 { font-size: 16px; margin-bottom: 8px; }
.process-step p { font-size: 13.5px; color: var(--gray-mid); }

/* ============ VALUE STRIP ============ */
.value-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.value-item { padding: 30px; background: rgba(255,255,255,0.04); border-radius: 3px; border: 1px solid var(--gray-line); }
.value-item h4 { color: var(--amber); font-size: 17px; margin-bottom: 10px; }
.value-item p { color: var(--steel-pale); font-size: 14px; }

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; min-height: auto; }
  .hero-visual { min-height: 320px; order: -1; }
  .hero-content { margin: 0; padding: 60px 0 50px; max-width: 100%; }
  .hero-content h1 { font-size: 34px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stat-grid div:nth-child(odd) { border-left: none; }
  .stat-grid div:nth-child(3), .stat-grid div:nth-child(4) { border-top: 1px solid var(--gray-line); padding-top: 20px; }
  .card-grid { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .form-row { grid-template-columns: 1fr; }
  .checkbox-grid { grid-template-columns: 1fr; }
  .work-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; gap: 32px; }
  .value-strip { grid-template-columns: 1fr; }
  .nav-links {
    display: none;
    position: absolute;
    top: 78px; left: 0; right: 0;
    background: var(--charcoal);
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 18px;
    border-bottom: 1px solid var(--gray-line);
  }
  .nav-links.mobile-open { display: flex; }
  .nav-toggle { display: flex; }
  .nav-cta { display: inline-block; width: fit-content; }
}