/* ===========================================================
   SIXAN English Website - Global Stylesheet
   Tech stack: pure HTML5 + CSS3 (Flexbox/Grid), responsive
   Primary: #0A4DA6  Accent: #00B8D4  BG: #F5F7FA
   =========================================================== */

:root {
  --primary: #0A4DA6;
  --primary-dark: #083d85;
  --accent: #00B8D4;
  --ink: #1a2330;
  --muted: #5b6678;
  --bg: #F5F7FA;
  --white: #ffffff;
  --border: #e4e8ef;
  --radius: 8px;
  --shadow: 0 4px 18px rgba(10, 77, 166, 0.08);
  --shadow-hover: 0 10px 30px rgba(10, 77, 166, 0.16);
  --max: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Roboto', -apple-system, 'Segoe UI', Arial, sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all .2s ease;
  border: 2px solid transparent;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: transparent; }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-light { background: #fff; color: var(--primary); }
.btn-light:hover { background: var(--bg); }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 22px; color: var(--primary); letter-spacing: .5px; }
.logo img { height: 34px; width:auto; object-fit:contain; display:block; }
.main-nav { display: flex; align-items: center; gap: 26px; margin-left: auto; margin-right: 24px; }
.main-nav > a, .dropdown > a {
  font-weight: 500; font-size: 15px; color: var(--ink);
  padding: 8px 0; position: relative; transition: color .2s;
}
.main-nav > a:hover, .dropdown > a:hover { color: var(--primary); }
.main-nav a.active { color: var(--primary); font-weight: 700; }
.main-nav a.active::after {
  content: ''; position: absolute; left: 0; bottom: -2px;
  width: 100%; height: 2px; background: var(--primary);
}
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute; top: 100%; left: 0;
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  min-width: 210px; padding: 8px 0;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: all .2s ease;
}
.dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu a { display: block; padding: 10px 18px; font-size: 14px; color: var(--muted); }
.dropdown-menu a:hover { background: var(--bg); color: var(--primary); }
.nav-toggle { display: none; font-size: 26px; background: none; border: none; color: var(--primary); cursor: pointer; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(120deg, #0A4DA6 0%, #083d85 60%, #00B8D4 140%);
  color: #fff; text-align: center;
  padding: 110px 0 120px;
  position: relative; overflow: hidden;
}
.hero::after {
  content:''; position:absolute; inset:0;
  background: url('../assets/hero/hero-bg.jpg') center/cover no-repeat;
  opacity:.18; mix-blend-mode: screen;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 { font-size: 46px; line-height: 1.2; font-weight: 800; margin-bottom: 18px; }
.hero p.lead { font-size: 19px; opacity: .92; max-width: 720px; margin: 0 auto 34px; }
.hero .btn-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- Sections ---------- */
section { padding: 76px 0; }
.section-alt { background: var(--bg); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 52px; }
.section-head h2 { font-size: 34px; font-weight: 800; margin-bottom: 14px; }
.section-head p { color: var(--muted); font-size: 17px; }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; font-size: 13px; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card { background: #fff; border:1px solid var(--border); border-radius: var(--radius); padding: 30px 20px; text-align: center; box-shadow: var(--shadow); }
.stat-card .num { font-size: 38px; font-weight: 800; color: var(--primary); }
.stat-card .label { color: var(--muted); font-size: 15px; margin-top: 6px; }

/* ---------- Cards grid ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 28px; box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.card .icon { width: 52px; height: 52px; border-radius: 12px; background: linear-gradient(135deg,var(--primary),var(--accent)); display:flex; align-items:center; justify-content:center; color:#fff; font-size:24px; margin-bottom: 18px; }
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15px; margin-bottom: 16px; }
.card .more { color: var(--primary); font-weight: 600; font-size: 14px; }

/* ---------- Product / solution block ---------- */
.feature-block { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; padding: 48px 0; border-bottom: 1px solid var(--border); }
.feature-block:nth-child(even) .feature-text { order: 2; }
.feature-text h3 { font-size: 26px; margin-bottom: 14px; color: var(--primary); }
.feature-text ul { list-style: none; margin: 16px 0; }
.feature-text ul li { padding: 7px 0 7px 26px; position: relative; color: var(--muted); }
.feature-text ul li::before { content:'✓'; position:absolute; left:0; color: var(--accent); font-weight: 800; }
.feature-img { background: var(--bg); border-radius: var(--radius); min-height: 260px; display:flex; align-items:center; justify-content:center; color: var(--muted); border:1px dashed var(--border); overflow:hidden; }
.feature-img img { width:100%; height:100%; object-fit:cover; display:block; }
.media-img { width:100%; border-radius: var(--radius); overflow:hidden; box-shadow: var(--shadow); }
.media-img img { width:100%; display:block; object-fit:cover; }
.card-img { width:100%; height:170px; object-fit:cover; border-radius:6px; margin-bottom:16px; }

/* ---------- Spec table ---------- */
.spec-table { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: 14px; }
.spec-table th, .spec-table td { text-align: left; padding: 10px 14px; border: 1px solid var(--border); }
.spec-table th { background: var(--bg); color: var(--ink); font-weight: 700; }

/* ---------- Logo wall ---------- */
.logo-wall { display: grid; grid-template-columns: repeat(5,1fr); gap: 20px; align-items:center; }
.logo-wall div { background:#fff; border:1px solid var(--border); border-radius: var(--radius); height: 80px; display:flex; align-items:center; justify-content:center; color: var(--muted); font-weight:600; }

/* ---------- CTA band ---------- */
.cta-band { background: linear-gradient(120deg,var(--primary),var(--primary-dark)); color:#fff; text-align:center; padding: 70px 0; }
.cta-band h2 { font-size: 30px; margin-bottom: 18px; }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; max-width: 760px; margin: 0 auto; }
.form-grid .full { grid-column: 1 / -1; }
.form-grid label { display:block; font-size:14px; font-weight:600; margin-bottom:6px; }
.form-grid input, .form-grid select, .form-grid textarea {
  width:100%; padding: 12px 14px; border:1px solid var(--border); border-radius: 6px; font-size: 15px; font-family: inherit;
}
.form-grid textarea { min-height: 130px; resize: vertical; }

/* ---------- Footer ---------- */
.site-footer { background: #0c1424; color: #c4ccda; padding: 56px 0 28px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 32px; margin-bottom: 36px; }
.site-footer h4 { color:#fff; font-size: 15px; margin-bottom: 14px; }
.site-footer a { display:block; color:#9aa6b8; padding: 4px 0; }
.site-footer a:hover { color: var(--accent); }
.footer-brand .logo { color:#fff; margin-bottom: 12px; }
.footer-bottom { border-top: 1px solid #1d2740; padding-top: 20px; text-align:center; color:#6b7689; }

/* ---------- Page hero (inner pages) ---------- */
.page-hero { background: linear-gradient(120deg,var(--primary),var(--primary-dark)); color:#fff; padding: 64px 0; text-align:center; }
.page-hero h1 { font-size: 38px; margin-bottom: 10px; }
.page-hero p { opacity:.9; font-size: 17px; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .stats { grid-template-columns: repeat(2,1fr); }
  .logo-wall { grid-template-columns: repeat(3,1fr); }
}
@media (max-width: 768px) {
  .main-nav { display:none; position:absolute; top:68px; left:0; right:0; flex-direction:column; background:#fff; border-bottom:1px solid var(--border); padding: 12px 24px; gap: 4px; margin:0; }
  .main-nav.open { display:flex; }
  .main-nav > a, .dropdown > a { padding: 12px 0; width:100%; }
  .dropdown-menu { position: static; opacity:1; visibility:visible; transform:none; box-shadow:none; border:none; padding-left: 14px; }
  .nav-toggle { display:block; }
  .nav-wrap .btn-primary { display:none; }
  .hero h1 { font-size: 32px; }
  .grid-3, .grid-2, .form-grid { grid-template-columns: 1fr; }
  .feature-block { grid-template-columns: 1fr; gap: 24px; }
  .feature-block:nth-child(even) .feature-text { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}