/*
Theme Name: HTS Engineering Pro v3
Theme URI: https://htsmep.vn
Author: HTS Engineering
Author URI: https://htsmep.vn
Description: Corporate MEP Engineering — WordPress theme v3. SEO 2026 + GEO + AI Overview optimized.
Version: 3.0.0
Requires at least: 6.4
Tested up to: 6.7
Requires PHP: 8.1
License: Proprietary
Text Domain: hts-engineering
*/

/* ============================================================
   DESIGN TOKENS — HTS Engineering v3
   Corporate Premium: Dark Navy + Sky Blue + Gold accents
   ============================================================ */
:root {
  /* Brand palette (primary dark theme matches uploaded HTMLs) */
  --clr-bg:           #07101d;
  --clr-bg-2:         #0c182c;
  --clr-bg-3:         #113155;
  --clr-primary:      #0ea5e9;
  --clr-primary-2:    #2563eb;
  --clr-accent:       #38bdf8;
  --clr-gold:         #f59e0b;
  --clr-green:        #16a34a;

  /* Light surface */
  --clr-white:        #ffffff;
  --clr-soft:         #f4f8fc;
  --clr-soft-2:       #eef4fb;
  --clr-surface:      #f8fbfe;
  --clr-text:         #0f172a;
  --clr-text-muted:   #5b6b80;
  --clr-border:       #dce6f1;
  --clr-border-2:     #c9d9ea;

  /* Category colors */
  --hvac:             #0ea5e9;
  --hvac-bg:          #e0f2fe;
  --dien:             #f59e0b;
  --dien-bg:          #fef3c7;
  --pccc:             #ef4444;
  --pccc-bg:          #fee2e2;
  --nuoc:             #06b6d4;
  --nuoc-bg:          #cffafe;
  --bim:              #8b5cf6;
  --bim-bg:           #ede9fe;

  /* Shadows */
  --shadow-sm:        0 4px 12px rgba(15,23,42,.06);
  --shadow:           0 16px 42px rgba(15,23,42,.08);
  --shadow-lg:        0 26px 70px rgba(2,8,23,.14);
  --shadow-xl:        0 40px 100px rgba(2,8,23,.22);

  /* Radii */
  --radius-sm:        16px;
  --radius:           24px;
  --radius-lg:        32px;

  /* Typography */
  --font-display:     'Playfair Display', Georgia, serif;
  --font-body:        'Inter', 'Plus Jakarta Sans', Arial, sans-serif;
  --font-mono:        'JetBrains Mono', monospace;

  /* Transitions */
  --t-fast:           .2s ease;
  --t-base:           .28s ease;
  --t-slow:           .45s ease;

  /* Layout */
  --container:        1220px;
  --sp-xs:            .375rem;
  --sp-sm:            .75rem;
  --sp-md:            1.25rem;
  --sp-lg:            1.75rem;
  --sp-xl:            2.25rem;
  --sp-2xl:           3rem;
  --sp-3xl:           4rem;
  --sp-4xl:           5.5rem;

  --HTS_VERSION:      '3.0.0';
}

/* ── BASE ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box }
html { scroll-behavior: smooth }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { text-decoration: none; color: inherit; transition: color var(--t-fast) }
img { max-width: 100%; display: block }
h1,h2,h3,h4,h5,h6,p,ul,ol { margin: 0 }
button, input, select, textarea { font: inherit }

/* ── CONTAINER ──────────────────────────────────────────── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.section { padding-block: var(--sp-4xl) }
.section--alt { background: linear-gradient(180deg, var(--clr-soft) 0%, var(--clr-soft-2) 100%) }
.section--dark {
  background: linear-gradient(180deg, var(--clr-bg) 0%, var(--clr-bg-2) 100%);
  color: var(--clr-white);
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .625rem;
  min-height: 54px;
  padding: 0 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: .9375rem;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
  white-space: nowrap;
  text-decoration: none;
}
.btn:hover { transform: translateY(-2px) }
.btn--primary {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-2));
  color: var(--clr-white);
  box-shadow: var(--shadow-lg);
}
.btn--primary:hover { box-shadow: var(--shadow-xl) }
.btn--ghost {
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.15);
  color: var(--clr-white);
}
.btn--ghost:hover { background: rgba(255,255,255,.14) }
.btn--light {
  background: var(--clr-white);
  border-color: var(--clr-border);
  color: var(--clr-text);
  box-shadow: var(--shadow-sm);
}
.btn--light:hover { box-shadow: var(--shadow) }
.btn--lg { min-height: 60px; padding: 0 2rem; font-size: 1rem }

/* ── BADGES ─────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  padding: .4rem .9rem;
  border-radius: 999px;
  font-size: .6875rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  white-space: nowrap;
}
.badge--blue   { background: #e0f2fe; border: 1px solid #bae6fd; color: #075985 }
.badge--green  { background: #dcfce7; border: 1px solid #bbf7d0; color: #14532d }
.badge--gold   { background: #fef3c7; border: 1px solid #fde68a; color: #92400e }
.badge--dark   { background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.12); color: #fff }

/* ── SECTION HEADERS ─────────────────────────────────────── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .6875rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--clr-primary);
  margin-bottom: var(--sp-sm);
}
.section-label::before {
  content: '';
  width: .625rem;
  height: .625rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-2));
  box-shadow: 0 0 0 5px rgba(14,165,233,.12);
}
.section-h2 {
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -.035em;
  line-height: 1.08;
  margin-bottom: var(--sp-md);
}
.section-h2--light { color: var(--clr-white) }
.section-sub {
  font-size: 1.0625rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
  max-width: 640px;
}

/* ── REVEAL ANIMATION ─────────────────────────────────────── */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s ease, transform .65s ease;
}
[data-reveal].is-visible { opacity: 1; transform: none }

/* ── EYEBROW TAG ──────────────────────────────────────────── */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .55rem 1rem;
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .2px;
  text-transform: uppercase;
}
.eyebrow--light {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.12);
  color: var(--clr-accent);
}
.eyebrow--blue {
  background: #e0f2fe;
  border: 1px solid #bae6fd;
  color: #075985;
}

/* ── BREADCRUMB ───────────────────────────────────────────── */
.breadcrumb nav { display: flex; align-items: center; flex-wrap: wrap; gap: .25rem }
.breadcrumb a { font-size: .8125rem; transition: color var(--t-fast) }
.breadcrumb .sep { font-size: .75rem; opacity: .4 }

/* ── CARD BASE ────────────────────────────────────────────── */
.card-base {
  background: var(--clr-white);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--t-base), box-shadow var(--t-base);
  position: relative;
  overflow: hidden;
}
.card-base:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}
.card-base::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-primary-2));
}

/* ── CARD CTA LINK ────────────────────────────────────────── */
.card-cta {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .7rem .9rem;
  border-radius: 999px;
  background: #eff6ff;
  border: 1px solid #dbeafe;
  color: #1d4ed8;
  font-size: .8125rem;
  font-weight: 800;
  transition: background var(--t-fast);
}
.card-cta:hover { background: #dbeafe }

/* ── TAG ─────────────────────────────────────────────────── */
.tag {
  padding: .45rem .7rem;
  border-radius: 999px;
  background: #eff6ff;
  border: 1px solid #dbeafe;
  color: #1d4ed8;
  font-size: .6875rem;
  font-weight: 800;
}

/* ── GRID UTILITIES ───────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem }

@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr) }
}
@media (max-width: 540px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr }
}