/* =========================================================
   NK ENGINEERING — Design System
   Premium water & ground engineering visual identity
   ========================================================= */

:root {
  --color-bg: #ffffff;
  --color-surface: #f6f9fb;
  --color-surface-alt: #eef3f6;
  --color-ink: #0d1b2a;
  --color-ink-soft: #3c4a5a;
  --color-muted: #6b7c8d;
  --color-border: #e2e8ee;

  --color-primary: #0b3b5c;
  --color-primary-dark: #072840;
  --color-primary-light: #134f78;
  --color-aqua: #0ea5a8;
  --color-aqua-dark: #0b8386;
  --color-aqua-light: #e3f7f7;

  --color-success: #1a8754;
  --color-warning: #b3760a;
  --color-danger: #b3261e;

  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(13, 27, 42, 0.08);
  --shadow-md: 0 8px 24px rgba(13, 27, 42, 0.10);
  --shadow-lg: 0 20px 50px rgba(13, 27, 42, 0.16);

  --container-max: 1240px;
  --transition: 0.25s ease;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0 0 0.5em; line-height: 1.2; font-weight: 700; color: var(--color-primary-dark); letter-spacing: -0.01em; }
p { margin: 0 0 1em; color: var(--color-ink-soft); }
button { font-family: inherit; cursor: pointer; }

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 20px; }
@media (min-width: 768px) { .container { padding: 0 32px; } }
@media (min-width: 1280px) { .container { padding: 0 40px; } }

.section { padding: 56px 0; }
@media (min-width: 768px) { .section { padding: 88px 0; } }

.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--color-aqua-dark); margin-bottom: 14px;
}
.section-label::before { content: ""; width: 22px; height: 2px; background: var(--color-aqua); display: inline-block; }
.section-head { max-width: 680px; margin-bottom: 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.4rem); }
.section-head p { font-size: 1.05rem; }

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem;
  border: 2px solid transparent; transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn-primary { background: var(--color-aqua); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-aqua-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline { border-color: rgba(255,255,255,0.55); color: #fff; }
.btn-outline:hover { background: rgba(255,255,255,0.12); transform: translateY(-2px); }
.btn-dark { background: var(--color-primary); color: #fff; }
.btn-dark:hover { background: var(--color-primary-dark); transform: translateY(-2px); }
.btn-ghost { border-color: var(--color-border); color: var(--color-primary-dark); }
.btn-ghost:hover { border-color: var(--color-aqua); color: var(--color-aqua-dark); }
.btn-sm { padding: 10px 18px; font-size: 0.85rem; }
.btn-block { width: 100%; }

/* ============ HEADER ============ */
.site-header {
  position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.96); backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 76px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; color: var(--color-primary-dark); }
.brand img { height: 40px; width: auto; }
.brand-sub { display: block; font-size: 0.68rem; font-weight: 600; letter-spacing: 0.06em; color: var(--color-aqua-dark); text-transform: uppercase; }

.main-nav { display: none; }
@media (min-width: 1024px) {
  .main-nav { display: flex; align-items: center; gap: 4px; }
  .main-nav > ul { display: flex; align-items: center; gap: 2px; }
  .main-nav a.nav-link {
    display: flex; align-items: center; gap: 6px; padding: 10px 16px; border-radius: var(--radius-sm);
    font-weight: 600; font-size: 0.94rem; color: var(--color-ink); transition: background var(--transition), color var(--transition);
  }
  .main-nav a.nav-link:hover, .main-nav li.has-children:hover > a.nav-link { background: var(--color-surface); color: var(--color-primary); }
  .main-nav li.has-children { position: relative; }
  .dropdown {
    position: absolute; top: 100%; left: 0; min-width: 280px; background: #fff; border: 1px solid var(--color-border);
    border-radius: var(--radius-md); box-shadow: var(--shadow-lg); padding: 10px; opacity: 0; visibility: hidden;
    transform: translateY(6px); transition: all var(--transition); z-index: 20;
  }
  .main-nav li.has-children:hover .dropdown,
  .main-nav li.has-children:focus-within .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
  .dropdown a { display: block; padding: 10px 14px; border-radius: var(--radius-sm); font-size: 0.92rem; font-weight: 500; color: var(--color-ink-soft); }
  .dropdown a:hover { background: var(--color-aqua-light); color: var(--color-aqua-dark); }
}

.header-actions { display: flex; align-items: center; gap: 10px; }
.header-phone { display: none; }
@media (min-width: 640px) {
  .header-phone { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--color-primary-dark); font-size: 0.95rem; }
  .header-phone svg { width: 18px; height: 18px; color: var(--color-aqua); }
}
.menu-toggle {
  display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: var(--radius-sm);
  background: var(--color-surface); border: 1px solid var(--color-border);
}
@media (min-width: 1024px) { .menu-toggle { display: none; } }

.mobile-nav {
  position: fixed; inset: 0; background: #fff; z-index: 200; transform: translateX(100%);
  transition: transform 0.3s ease; overflow-y: auto; padding: 20px;
}
.mobile-nav.is-open { transform: translateX(0); }
.mobile-nav-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.mobile-nav a { display: block; padding: 14px 6px; font-weight: 600; font-size: 1.05rem; border-bottom: 1px solid var(--color-border); }
.mobile-nav .submenu { padding-left: 14px; }
.mobile-nav .submenu a { font-weight: 500; font-size: 0.95rem; color: var(--color-ink-soft); }
.mobile-cta { margin-top: 20px; display: flex; flex-direction: column; gap: 10px; }

/* ============ HERO ============ */
.hero {
  position: relative; color: #fff; background: linear-gradient(160deg, var(--color-primary-dark), var(--color-primary) 55%, var(--color-aqua-dark));
  overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: 0; opacity: 0.14; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.5) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at top right, black, transparent 70%);
}
.hero-inner { position: relative; z-index: 2; padding: 64px 0 56px; display: grid; gap: 36px; }
@media (min-width: 960px) { .hero-inner { grid-template-columns: 1.1fr 0.9fr; align-items: center; padding: 96px 0 84px; } }
.hero-eyebrow { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.25); padding: 8px 16px; border-radius: 999px; font-size: 0.82rem; font-weight: 600; letter-spacing: 0.03em; margin-bottom: 20px; }
.hero h1 { color: #fff; font-size: clamp(2rem, 1.5rem + 2.5vw, 3.3rem); margin-bottom: 18px; }
.hero p.lead { color: rgba(255,255,255,0.86); font-size: 1.12rem; max-width: 560px; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 32px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 22px; font-size: 0.9rem; color: rgba(255,255,255,0.8); }
.hero-meta div { display: flex; align-items: center; gap: 8px; }
.hero-visual {
  position: relative; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255,255,255,0.2); aspect-ratio: 4/3;
}
.hero-visual img { width: 100%; height: 100%; object-fit: cover; }

/* ============ TRUST STRIP ============ */
.trust-strip { background: var(--color-primary-dark); color: #fff; padding: 22px 0; }
.trust-strip .container { display: flex; flex-wrap: wrap; gap: 18px 34px; justify-content: space-between; align-items: center; }
.trust-item { display: flex; align-items: center; gap: 10px; font-size: 0.88rem; font-weight: 600; color: rgba(255,255,255,0.92); }
.trust-item svg { width: 20px; height: 20px; color: var(--color-aqua); flex-shrink: 0; }

/* ============ CARDS ============ */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid-2 { grid-template-columns: repeat(2, 1fr); } .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } .grid-4 { grid-template-columns: repeat(4, 1fr); } }

.card {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex; flex-direction: column; height: 100%;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }

.service-card { padding: 28px; }
.service-card .icon-wrap {
  width: 52px; height: 52px; border-radius: var(--radius-sm); background: var(--color-aqua-light); color: var(--color-aqua-dark);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.service-card .icon-wrap svg { width: 26px; height: 26px; }
.service-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.service-card p { font-size: 0.95rem; margin-bottom: 16px; flex-grow: 1; }
.service-card .card-link { font-weight: 700; color: var(--color-aqua-dark); font-size: 0.9rem; display: inline-flex; align-items: center; gap: 6px; }
.service-card .card-link svg { width: 16px; height: 16px; transition: transform var(--transition); }
.service-card:hover .card-link svg { transform: translateX(4px); }

.media-card .card-media { aspect-ratio: 16/10; overflow: hidden; background: var(--color-surface-alt); }
.media-card .card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.media-card:hover .card-media img { transform: scale(1.06); }
.media-card .card-body { padding: 22px; flex-grow: 1; display: flex; flex-direction: column; }
.media-card .tag { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-aqua-dark); margin-bottom: 8px; }
.media-card h3 { font-size: 1.08rem; margin-bottom: 8px; }
.media-card .meta { margin-top: auto; padding-top: 14px; font-size: 0.82rem; color: var(--color-muted); display: flex; gap: 12px; }

/* ============ PROCESS ============ */
.process-steps { display: grid; gap: 20px; counter-reset: step; }
@media (min-width: 860px) { .process-steps { grid-template-columns: repeat(4, 1fr); } }
.process-step { position: relative; padding: 28px 22px; background: var(--color-surface); border-radius: var(--radius-md); }
.process-step .step-num {
  width: 40px; height: 40px; border-radius: 50%; background: var(--color-primary); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px; font-size: 0.95rem;
}
.process-step h3 { font-size: 1.02rem; margin-bottom: 6px; }
.process-step p { font-size: 0.9rem; margin: 0; }

/* ============ STATS ============ */
.stats-row { display: grid; gap: 20px; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 768px) { .stats-row { grid-template-columns: repeat(4, 1fr); } }
.stat-item { text-align: center; padding: 20px; }
.stat-num { font-size: clamp(1.8rem, 1.4rem + 1.6vw, 2.6rem); font-weight: 800; color: var(--color-primary); }
.stat-label { font-size: 0.85rem; color: var(--color-muted); font-weight: 600; }

/* ============ FAQ ============ */
.faq-list { max-width: 820px; }
.faq-item { border-bottom: 1px solid var(--color-border); }
.faq-item summary {
  list-style: none; cursor: pointer; padding: 20px 4px; display: flex; justify-content: space-between; align-items: center;
  gap: 16px; font-weight: 700; font-size: 1rem; color: var(--color-primary-dark);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .icon { flex-shrink: 0; width: 22px; height: 22px; border-radius: 50%; background: var(--color-aqua-light); color: var(--color-aqua-dark); display: flex; align-items: center; justify-content: center; transition: transform var(--transition); font-size: 14px; }
.faq-item[open] summary .icon { transform: rotate(45deg); }
.faq-item .faq-answer { padding: 0 4px 20px; color: var(--color-ink-soft); }

/* ============ CTA ============ */
.cta-block { background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary)); color: #fff; border-radius: var(--radius-lg); padding: 48px 28px; text-align: center; }
@media (min-width: 768px) { .cta-block { padding: 64px 60px; } }
.cta-block h2 { color: #fff; }
.cta-block p { color: rgba(255,255,255,0.85); max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 24px; }

/* ============ CONTACT ============ */
.contact-grid { display: grid; gap: 40px; }
@media (min-width: 960px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; color: var(--color-primary-dark); }
.form-field input, .form-field select, .form-field textarea {
  width: 100%; padding: 13px 16px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 0.96rem; transition: border-color var(--transition), box-shadow var(--transition); background: #fff;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--color-aqua); box-shadow: 0 0 0 3px var(--color-aqua-light);
}
.form-field .error { color: var(--color-danger); font-size: 0.82rem; margin-top: 6px; }
.form-honeypot { position: absolute; left: -9999px; opacity: 0; }
.info-card { background: var(--color-surface); border-radius: var(--radius-md); padding: 26px; margin-bottom: 16px; }
.info-card h3 { font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-aqua-dark); margin-bottom: 10px; }
.map-embed { border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--color-border); }
.map-embed iframe { width: 100%; height: 320px; border: 0; display: block; }

/* ============ BREADCRUMB ============ */
.breadcrumb-bar { background: var(--color-surface); border-bottom: 1px solid var(--color-border); padding: 14px 0; }
.breadcrumb-bar ol { display: flex; flex-wrap: wrap; gap: 6px; font-size: 0.85rem; color: var(--color-muted); }
.breadcrumb-bar a { color: var(--color-primary); font-weight: 600; }
.breadcrumb-bar li:not(:last-child)::after { content: "/"; margin-left: 6px; color: var(--color-border); }

/* ============ FOOTER ============ */
.site-footer { background: var(--color-primary-dark); color: rgba(255,255,255,0.78); padding: 64px 0 24px; }
.footer-grid { display: grid; gap: 36px; margin-bottom: 40px; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
.footer-brand .brand { color: #fff; margin-bottom: 14px; }
.footer-brand p { color: rgba(255,255,255,0.65); font-size: 0.92rem; max-width: 320px; }
.footer-col h4 { color: #fff; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 16px; }
.footer-col a, .footer-col li { display: block; font-size: 0.92rem; color: rgba(255,255,255,0.68); margin-bottom: 10px; transition: color var(--transition); }
.footer-col a:hover { color: var(--color-aqua); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding-top: 22px; display: flex; flex-wrap: wrap; gap: 14px; justify-content: space-between; font-size: 0.82rem; color: rgba(255,255,255,0.55); }
.footer-bottom a { color: rgba(255,255,255,0.7); }

/* ============ FLOATING CTA ============ */
.floating-cta { position: fixed; right: 18px; bottom: 18px; z-index: 150; display: flex; flex-direction: column; gap: 12px; }
.floating-btn { width: 54px; height: 54px; border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-lg); transition: transform var(--transition); }
.floating-btn:hover { transform: scale(1.08); }
.floating-btn.call { background: var(--color-primary); color: #fff; }
.floating-btn.whatsapp { background: #25D366; color: #fff; }
.floating-btn svg { width: 26px; height: 26px; }

/* ============ MISC PAGES ============ */
.page-hero { background: var(--color-surface); padding: 48px 0; border-bottom: 1px solid var(--color-border); }
.page-hero h1 { font-size: clamp(1.8rem, 1.5rem + 1.5vw, 2.6rem); }
.prose { max-width: 780px; }
.prose h2 { margin-top: 1.6em; font-size: 1.5rem; }
.prose h3 { margin-top: 1.3em; font-size: 1.2rem; }
.prose ul { list-style: disc; padding-left: 1.4em; margin-bottom: 1em; }
.prose ul li { margin-bottom: 0.4em; color: var(--color-ink-soft); }
.prose table { width: 100%; border-collapse: collapse; margin: 1.4em 0; font-size: 0.92rem; }
.prose table th, .prose table td { border: 1px solid var(--color-border); padding: 10px 12px; text-align: left; }
.prose table th { background: var(--color-surface); }

.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 40px; flex-wrap: wrap; }
.pagination a, .pagination span { padding: 10px 16px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); font-weight: 600; font-size: 0.9rem; }
.pagination a:hover { border-color: var(--color-aqua); color: var(--color-aqua-dark); }
.pagination .active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.badge { display: inline-block; padding: 5px 12px; border-radius: 999px; background: var(--color-aqua-light); color: var(--color-aqua-dark); font-size: 0.78rem; font-weight: 700; }

.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px; }
.filter-bar a { padding: 9px 16px; border-radius: 999px; border: 1px solid var(--color-border); font-size: 0.86rem; font-weight: 600; color: var(--color-ink-soft); }
.filter-bar a.active, .filter-bar a:hover { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--color-muted); }

/* Error / thank you pages */
.center-page { min-height: 60vh; display: flex; align-items: center; justify-content: center; text-align: center; padding: 60px 20px; }
.center-page .code { font-size: 5rem; font-weight: 800; color: var(--color-aqua); line-height: 1; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

.two-col { display: grid; gap: 36px; align-items: center; }
@media (min-width: 900px) { .two-col { grid-template-columns: 1fr 1fr; } }
.two-col img { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.check-list li { display: flex; gap: 10px; margin-bottom: 12px; font-size: 0.96rem; color: var(--color-ink-soft); }
.check-list svg { width: 20px; height: 20px; color: var(--color-aqua-dark); flex-shrink: 0; margin-top: 2px; }

.skip-link { position: absolute; left: -9999px; top: 0; background: var(--color-primary); color: #fff; padding: 12px 18px; z-index: 999; }
.skip-link:focus { left: 12px; top: 12px; }