/* ============================================================
   BUSINESS LIGHT CO., LTD. — style.css
   สไตล์ทั้งหมด (Mobile-First) | โทน Industrial: navy + safety orange
   ============================================================ */

/* -----------------------------------------------------------
   1) ตัวแปรสี & ค่าพื้นฐาน (CSS Variables)
   ----------------------------------------------------------- */
:root {
  --color-primary: #14324f;      /* navy เหล็ก (สีหลัก) */
  --color-primary-dark: #0d2338; /* navy เข้ม */
  --color-secondary: #3a6ea5;    /* ฟ้าเหล็ก (สีรอง) */
  --color-accent: #f57c00;       /* safety orange (ปุ่ม/เน้น) */
  --color-accent-dark: #e06a00;
  --color-bg: #ffffff;           /* พื้นหลังหลัก */
  --color-bg-alt: #f2f5f8;       /* พื้นหลังสลับ */
  --color-text: #1e2a35;         /* ตัวอักษรหลัก */
  --color-muted: #5f6b76;        /* ตัวอักษรรอง */
  --color-border: #dce3ea;
  --color-white: #ffffff;

  --font-base: "Segoe UI", "Prompt", "Sarabun", system-ui, -apple-system, sans-serif;
  --radius: 10px;
  --shadow: 0 6px 20px rgba(20, 50, 79, 0.08);
  --shadow-lg: 0 12px 32px rgba(20, 50, 79, 0.15);
  --max-width: 1180px;
  --transition: 0.25s ease;
}

/* -----------------------------------------------------------
   2) Reset & Base
   ----------------------------------------------------------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-secondary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }

img { max-width: 100%; display: block; }

h1, h2, h3, h4 { line-height: 1.25; color: var(--color-primary); font-weight: 700; }

ul { list-style: none; }

/* -----------------------------------------------------------
   3) Layout helpers
   ----------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section { padding: 56px 0; }
.section-alt { background: var(--color-bg-alt); }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 40px; }
.section-head .eyebrow {
  display: inline-block;
  color: var(--color-accent);
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: 0.82rem;
  margin-bottom: 8px;
}
.section-head h2 { font-size: 1.9rem; margin-bottom: 12px; }
.section-head p { color: var(--color-muted); }

/* -----------------------------------------------------------
   4) ปุ่ม (Buttons)
   ----------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.98rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-align: center;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-dark); color: #fff; transform: translateY(-2px); }
.btn-outline { background: transparent; color: #fff; border-color: rgba(255,255,255,.7); }
.btn-outline:hover { background: #fff; color: var(--color-primary); }
.btn-ghost { background: var(--color-bg-alt); color: var(--color-primary); border-color: var(--color-border); }
.btn-ghost:hover { background: var(--color-primary); color: #fff; }
.btn-block { display: block; width: 100%; }

/* -----------------------------------------------------------
   5) Header & Navigation
   ----------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-primary);
  box-shadow: 0 2px 10px rgba(0,0,0,.12);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo {
  width: 40px; height: 40px; border-radius: 8px;
  background: linear-gradient(135deg, var(--color-accent), #ffb300);
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 1.1rem;
  flex-shrink: 0;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { color: #fff; font-size: 1.02rem; }
.brand-text span { color: #9fb6cc; font-size: 0.7rem; letter-spacing: .5px; }

.nav-menu {
  display: flex; align-items: center; gap: 6px;
  position: fixed; inset: 68px 0 auto 0;
  background: var(--color-primary-dark);
  flex-direction: column;
  padding: 12px 20px 20px;
  transform: translateY(-150%);
  transition: transform var(--transition);
}
.nav-menu.open { transform: translateY(0); }
.nav-menu a {
  color: #e6edf4; font-weight: 600; padding: 12px 14px;
  border-radius: 8px; width: 100%; text-align: center;
}
.nav-menu a:hover, .nav-menu a.active { background: rgba(255,255,255,.1); color: #fff; }
.nav-menu .btn { color: #fff; width: 100%; margin-top: 6px; }

.nav-toggle {
  display: flex; flex-direction: column; gap: 5px;
  background: none; border: 0; cursor: pointer; padding: 6px;
}
.nav-toggle span {
  width: 26px; height: 3px; background: #fff; border-radius: 2px;
  transition: all var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* -----------------------------------------------------------
   6) Hero
   ----------------------------------------------------------- */
.hero {
  position: relative;
  color: #fff;
  background:
    linear-gradient(rgba(13,35,56,.82), rgba(13,35,56,.82)),
    url("https://loremflickr.com/1280/720/steel,pipe,warehouse?lock=11") center/cover no-repeat;
}
.hero-inner { padding: 76px 0; max-width: 720px; }
.hero h1 { color: #fff; font-size: 2.3rem; margin-bottom: 16px; }
.hero p { font-size: 1.08rem; color: #dbe6f0; margin-bottom: 26px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 30px; }
.hero-badges div { display: flex; align-items: center; gap: 8px; font-size: .92rem; color: #cfe0f0; }
.hero-badges strong { color: var(--color-accent); }

/* -----------------------------------------------------------
   7) แถบสถิติ (Stats)
   ----------------------------------------------------------- */
.stats {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
  background: var(--color-primary); color: #fff;
  border-radius: var(--radius); padding: 30px 24px;
  margin-top: -40px; position: relative; z-index: 2; box-shadow: var(--shadow-lg);
}
.stats .stat { text-align: center; }
.stats .stat b { display: block; font-size: 2rem; color: var(--color-accent); }
.stats .stat span { color: #cdd9e5; font-size: .9rem; }

/* -----------------------------------------------------------
   8) จุดเด่น (Features)
   ----------------------------------------------------------- */
.features-grid { display: grid; grid-template-columns: 1fr; gap: 22px; }
.feature-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 26px 22px; text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.feature-card .icon {
  width: 58px; height: 58px; margin: 0 auto 16px;
  border-radius: 14px; display: grid; place-items: center;
  background: var(--color-bg-alt); font-size: 1.6rem;
}
.feature-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.feature-card p { color: var(--color-muted); font-size: .95rem; }

/* -----------------------------------------------------------
   9) การ์ดสินค้า (Products)
   ----------------------------------------------------------- */
.products-grid {
  display: grid; grid-template-columns: 1fr; gap: 22px;
}
.product-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius); overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.product-card .thumb { position: relative; aspect-ratio: 4/3; overflow: hidden; background: var(--color-bg-alt); }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.product-card:hover .thumb img { transform: scale(1.06); }
.product-card .tag {
  position: absolute; top: 10px; left: 10px;
  background: var(--color-accent); color: #fff;
  font-size: .72rem; font-weight: 700; padding: 4px 10px; border-radius: 20px;
}
.product-card .body { padding: 16px 16px 20px; display: flex; flex-direction: column; flex: 1; }
.product-card .cat { color: var(--color-secondary); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; }
.product-card h3 { font-size: 1.05rem; margin: 4px 0 8px; }
.product-card .desc { color: var(--color-muted); font-size: .88rem; margin-bottom: 14px; flex: 1; }
.product-card .price { font-size: 1.15rem; font-weight: 800; color: var(--color-primary); margin-bottom: 12px; }
.product-card .price small { font-weight: 500; color: var(--color-muted); font-size: .78rem; }

/* -----------------------------------------------------------
   10) แถบค้นหา & กรอง (Products page)
   ----------------------------------------------------------- */
.filter-bar { display: flex; flex-direction: column; gap: 14px; margin-bottom: 30px; }
.search-box { position: relative; }
.search-box input {
  width: 100%; padding: 13px 16px 13px 44px;
  border: 1px solid var(--color-border); border-radius: var(--radius);
  font-size: 1rem; font-family: inherit;
}
.search-box input:focus { outline: none; border-color: var(--color-accent); }
.search-box::before {
  content: "🔍"; position: absolute; left: 15px; top: 50%; transform: translateY(-50%);
  font-size: 1rem; opacity: .6;
}
.filter-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 16px; border-radius: 30px; border: 1px solid var(--color-border);
  background: #fff; color: var(--color-text); font-size: .88rem; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
}
.chip:hover { border-color: var(--color-accent); }
.chip.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.no-result { text-align: center; color: var(--color-muted); padding: 40px 0; grid-column: 1/-1; display: none; }

/* -----------------------------------------------------------
   11) รีวิว & พาร์ทเนอร์
   ----------------------------------------------------------- */
.reviews-grid { display: grid; grid-template-columns: 1fr; gap: 22px; }
.review-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow);
}
.review-card .stars { color: #ffb300; margin-bottom: 10px; }
.review-card p { color: var(--color-text); font-style: italic; margin-bottom: 16px; }
.review-card .who { display: flex; align-items: center; gap: 12px; }
.review-card .who img { width: 46px; height: 46px; border-radius: 50%; }
.review-card .who b { display: block; font-size: .95rem; color: var(--color-primary); }
.review-card .who span { font-size: .82rem; color: var(--color-muted); }

.partners { display: flex; flex-wrap: wrap; justify-content: center; gap: 30px 46px; align-items: center; }
.partners span {
  font-weight: 800; font-size: 1.15rem; color: var(--color-muted);
  opacity: .7; letter-spacing: .5px;
}

/* -----------------------------------------------------------
   12) CTA band
   ----------------------------------------------------------- */
.cta-band {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff; border-radius: var(--radius); text-align: center;
  padding: 44px 24px;
}
.cta-band h2 { color: #fff; font-size: 1.7rem; margin-bottom: 10px; }
.cta-band p { color: #dbe6f0; margin-bottom: 22px; }
.cta-band .btn-primary { background: var(--color-accent); }

/* -----------------------------------------------------------
   13) ขั้นตอนสั่งซื้อ (Order steps)
   ----------------------------------------------------------- */
.steps { display: grid; grid-template-columns: 1fr; gap: 20px; counter-reset: step; }
.step-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 24px; position: relative; padding-top: 40px;
}
.step-card::before {
  counter-increment: step; content: counter(step);
  position: absolute; top: -18px; left: 22px;
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--color-accent); color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: 1.15rem;
  box-shadow: var(--shadow);
}
.step-card h3 { font-size: 1.1rem; margin-bottom: 6px; }
.step-card p { color: var(--color-muted); font-size: .92rem; }

/* ตาราง (บัญชี/ค่าส่ง) */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--color-border); }
table { width: 100%; border-collapse: collapse; min-width: 460px; background: #fff; }
th, td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--color-border); font-size: .95rem; }
th { background: var(--color-primary); color: #fff; font-weight: 700; }
tr:last-child td { border-bottom: 0; }
tbody tr:nth-child(even) { background: var(--color-bg-alt); }

.pay-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.pay-card { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 24px; }
.pay-card h3 { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.pay-card .note { background: var(--color-bg-alt); border-radius: 8px; padding: 12px 14px; font-size: .9rem; color: var(--color-muted); margin-top: 14px; }

/* FAQ (accordion) */
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; background: #fff; }
.faq-q {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  padding: 18px 20px; font-size: 1rem; font-weight: 700; color: var(--color-primary);
  display: flex; justify-content: space-between; align-items: center; gap: 12px; font-family: inherit;
}
.faq-q .plus { color: var(--color-accent); font-size: 1.4rem; transition: transform var(--transition); flex-shrink: 0; }
.faq-item.open .faq-q .plus { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height var(--transition); }
.faq-a p { padding: 0 20px 18px; color: var(--color-muted); font-size: .93rem; }

/* -----------------------------------------------------------
   14) หน้า Contact
   ----------------------------------------------------------- */
.contact-grid { display: grid; grid-template-columns: 1fr; gap: 30px; }
.info-list { display: flex; flex-direction: column; gap: 18px; }
.info-item { display: flex; gap: 14px; align-items: flex-start; }
.info-item .ic {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: 10px;
  background: var(--color-bg-alt); display: grid; place-items: center; font-size: 1.2rem;
}
.info-item b { color: var(--color-primary); display: block; margin-bottom: 2px; }
.info-item span, .info-item a { color: var(--color-muted); font-size: .95rem; }

.form { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .92rem; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--color-border);
  border-radius: 8px; font-size: 1rem; font-family: inherit; background: #fff;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--color-accent);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group .error-msg { color: #d32f2f; font-size: .82rem; margin-top: 5px; display: none; }
.form-group.invalid input, .form-group.invalid textarea, .form-group.invalid select { border-color: #d32f2f; }
.form-group.invalid .error-msg { display: block; }
.form-success {
  display: none; background: #e7f6ec; color: #1b7a3d; border: 1px solid #b6e2c4;
  border-radius: 8px; padding: 14px; margin-bottom: 18px; font-weight: 600;
}
.map-embed { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--color-border); margin-top: 30px; }
.map-embed iframe { width: 100%; height: 340px; border: 0; display: block; }

/* -----------------------------------------------------------
   15) Breadcrumb / page hero เล็ก
   ----------------------------------------------------------- */
.page-hero {
  background: linear-gradient(rgba(13,35,56,.86), rgba(13,35,56,.86)),
    url("https://loremflickr.com/1280/400/construction,steel?lock=22") center/cover no-repeat;
  color: #fff; padding: 50px 0; text-align: center;
}
.page-hero h1 { color: #fff; font-size: 2rem; margin-bottom: 8px; }
.page-hero p { color: #cfe0f0; }

/* -----------------------------------------------------------
   16) Footer
   ----------------------------------------------------------- */
.site-footer { background: var(--color-primary-dark); color: #b9c8d6; padding: 48px 0 24px; margin-top: 20px; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 30px; margin-bottom: 30px; }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 14px; }
.footer-col p, .footer-col li { font-size: .9rem; margin-bottom: 8px; }
.footer-col a { color: #b9c8d6; }
.footer-col a:hover { color: var(--color-accent); }
.footer-brand .brand-text strong { font-size: 1.1rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1); padding-top: 18px;
  text-align: center; font-size: .84rem; color: #8ca0b3;
}

/* -----------------------------------------------------------
   17) Scroll reveal (JS เพิ่มคลาส .visible)
   ----------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* -----------------------------------------------------------
   18) Responsive — Tablet & Desktop
   ----------------------------------------------------------- */
@media (min-width: 600px) {
  .stats { grid-template-columns: repeat(4, 1fr); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .pay-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .filter-bar { flex-direction: row; align-items: center; justify-content: space-between; }
  .search-box { flex: 1; max-width: 340px; }
}

@media (min-width: 900px) {
  .hero h1 { font-size: 2.9rem; }
  .products-grid { grid-template-columns: repeat(3, 1fr); }
  .features-grid { grid-template-columns: repeat(4, 1fr); }
  .reviews-grid { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(4, 1fr); }
  .contact-grid { grid-template-columns: 1.1fr 1fr; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1.3fr; }

  /* เมนูเดสก์ท็อป — แสดงแนวนอน, ยกเลิก hamburger */
  .nav-toggle { display: none; }
  .nav-menu {
    position: static; flex-direction: row; transform: none;
    background: transparent; padding: 0; width: auto; gap: 4px;
  }
  .nav-menu a { width: auto; }
  .nav-menu .btn { width: auto; margin-top: 0; margin-left: 8px; }
}