/* ==========================================================================
   TAM HITECH SERVICE CO., LTD. — DESIGN SYSTEM
   Domain: tam-hitech.co.th
   Focus: Network Installation & Maintenance Services (24/7 SLA Support)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  --clr-bg: #061E14;
  --clr-bg-card: rgba(16, 44, 32, 0.75);
  --clr-bg-card-hover: rgba(16, 44, 32, 0.95);
  --clr-primary: #10B981;
  --clr-primary-glow: rgba(16, 185, 129, 0.35);
  --clr-emerald: #34D399;
  --clr-accent-gold: #F59E0B;
  --clr-text-main: #F8FAFC;
  --clr-text-muted: #9CA3AF;
  --clr-border: rgba(255, 255, 255, 0.12);
  --clr-border-glow: rgba(16, 185, 129, 0.5);

  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --glass-bg: rgba(6, 30, 20, 0.85);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.3);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-body); background-color: var(--clr-bg); color: var(--clr-text-main); line-height: 1.6; overflow-x: hidden; }

.bg-mesh {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: -1; pointer-events: none;
  background: 
    radial-gradient(circle at 15% 20%, rgba(16, 185, 129, 0.2) 0%, transparent 45%),
    radial-gradient(circle at 85% 60%, rgba(245, 158, 11, 0.15) 0%, transparent 50%);
  filter: blur(40px);
}

h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 700; line-height: 1.2; }
.text-gradient { background: linear-gradient(135deg, #FFFFFF 0%, var(--clr-emerald) 50%, var(--clr-accent-gold) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

.navbar { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: var(--glass-bg); backdrop-filter: blur(16px); border-bottom: 1px solid var(--clr-border); padding: 0.85rem 0; }
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.brand-logo { display: flex; align-items: center; gap: 14px; text-decoration: none; }
.brand-logo img { width: 48px; height: 48px; border-radius: 50%; border: 2px solid var(--clr-primary); box-shadow: 0 0 15px var(--clr-primary-glow); }
.brand-title { font-family: var(--font-heading); font-size: 1.3rem; font-weight: 800; color: #FFF; line-height: 1.1; }
.brand-sub { font-size: 0.7rem; font-weight: 700; letter-spacing: 2px; color: var(--clr-emerald); text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 1.75rem; list-style: none; }
.nav-link { color: var(--clr-text-muted); text-decoration: none; font-weight: 500; font-size: 0.95rem; transition: var(--transition); }
.nav-link:hover, .nav-link.active { color: var(--clr-emerald); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.75rem 1.75rem; border-radius: var(--radius-full); font-family: var(--font-heading); font-weight: 600; font-size: 0.95rem; text-decoration: none; cursor: pointer; border: none; transition: var(--transition); }
.btn-primary { background: linear-gradient(135deg, var(--clr-primary) 0%, #059669 100%); color: #FFF; box-shadow: 0 4px 20px var(--clr-primary-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow); }
.btn-outline { background: transparent; color: var(--clr-text-main); border: 1px solid var(--clr-border); }
.btn-outline:hover { border-color: var(--clr-emerald); color: var(--clr-emerald); }

.hero { padding: 10rem 0 6rem; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.hero-title { font-size: 3.5rem; font-weight: 800; margin-bottom: 1.25rem; }
.hero-desc { font-size: 1.15rem; color: var(--clr-text-muted); margin-bottom: 2rem; }

.section { padding: 6rem 0; }
.section-header { text-align: center; max-width: 650px; margin: 0 auto 4rem; }
.section-tag { color: var(--clr-emerald); font-weight: 700; font-size: 0.85rem; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 0.5rem; display: block; }
.section-title { font-size: 2.5rem; margin-bottom: 1rem; }

.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.service-card { background: var(--clr-bg-card); border: 1px solid var(--clr-border); border-radius: var(--radius-md); padding: 2.5rem 2rem; transition: var(--transition); }
.service-card:hover { background: var(--clr-bg-card-hover); transform: translateY(-8px); border-color: var(--clr-border-glow); box-shadow: var(--shadow-glow); }
.service-icon { width: 56px; height: 56px; border-radius: var(--radius-sm); background: rgba(16, 185, 129, 0.15); color: var(--clr-emerald); display: flex; align-items: center; justify-content: center; font-size: 1.75rem; margin-bottom: 1.5rem; }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.contact-info-card { background: var(--clr-bg-card); border: 1px solid var(--clr-border); border-radius: var(--radius-md); padding: 2.5rem; }
.contact-form { display: flex; flex-direction: column; gap: 1.25rem; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 0.85rem 1.2rem; background: rgba(6, 30, 20, 0.8); border: 1px solid var(--clr-border); border-radius: var(--radius-sm); color: #FFF; font-family: var(--font-body); }

.footer { border-top: 1px solid var(--clr-border); padding: 4rem 0 2rem; background: rgba(3, 15, 10, 0.95); text-align: center; }

@media (max-width: 992px) {
  .hero-grid, .services-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 2.75rem; }
}