/* ===================================================
   ThermoFilmX – Global Stylesheet
   Company: Peidi New Materials (Jiangsu) Co., Ltd.
   Domain: thermofilmx.com
   =================================================== */

/* ---------- Variables ---------- */
:root {
  --blue:       #1A3A5C;
  --blue-mid:   #1A6B8A;
  --blue-light: #2a8fba;
  --green:      #2E8B57;
  --orange:     #E8532A;
  --orange-h:   #c73e1a;
  --white:      #ffffff;
  --gray-100:   #f8f9fa;
  --gray-200:   #e9ecef;
  --gray-400:   #ced4da;
  --gray-600:   #6c757d;
  --gray-800:   #343a40;
  --text:       #222831;
  --radius:     8px;
  --shadow:     0 4px 24px rgba(0,0,0,.10);
  --shadow-lg:  0 8px 40px rgba(0,0,0,.16);
  --trans:      0.25s ease;
  --max-w:      1200px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'Inter', 'Roboto', sans-serif; color: var(--text); background: var(--white); line-height: 1.6; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- Typography ---------- */
h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 800; line-height: 1.15; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); font-weight: 700; line-height: 1.2; }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); font-weight: 700; }
h4 { font-size: 1.1rem; font-weight: 600; }
p  { font-size: 1rem; line-height: 1.75; }

/* ---------- Utility ---------- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.section    { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.text-center { text-align: center; }
.text-white  { color: var(--white); }
.tag { display: inline-block; font-size: .75rem; font-weight: 700; padding: 3px 10px; border-radius: 50px; text-transform: uppercase; letter-spacing: .05em; }
.tag-orange { background: var(--orange); color: #fff; }
.tag-green  { background: var(--green);  color: #fff; }
.tag-blue   { background: var(--blue-mid); color: #fff; }
.section-label { font-size: .85rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--blue-mid); margin-bottom: 12px; }
.section-title { margin-bottom: 16px; }
.section-sub   { font-size: 1.1rem; color: var(--gray-600); max-width: 640px; margin: 0 auto 48px; }
.divider { width: 56px; height: 4px; background: var(--orange); border-radius: 2px; margin: 16px auto 32px; }
.divider-left { margin: 16px 0 32px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.flex-center { display: flex; align-items: center; justify-content: center; gap: 16px; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; border-radius: var(--radius); font-size: 1rem; font-weight: 700; cursor: pointer; border: none; transition: var(--trans); text-decoration: none; white-space: nowrap; }
.btn-orange  { background: var(--orange); color: #fff; }
.btn-orange:hover { background: var(--orange-h); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(232,83,42,.35); }
.btn-blue    { background: var(--blue); color: #fff; }
.btn-blue:hover { background: var(--blue-mid); transform: translateY(-2px); }
.btn-outline { border: 2px solid var(--white); color: var(--white); background: transparent; }
.btn-outline:hover { background: var(--white); color: var(--blue); }
.btn-outline-blue { border: 2px solid var(--blue); color: var(--blue); background: transparent; }
.btn-outline-blue:hover { background: var(--blue); color: #fff; }
.btn-sm { padding: 10px 20px; font-size: .9rem; }
.btn-lg { padding: 18px 36px; font-size: 1.1rem; }

/* ---------- Header / Nav ---------- */
#header { position: sticky; top: 0; z-index: 1000; background: var(--white); box-shadow: 0 2px 16px rgba(0,0,0,.09); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.35rem; color: var(--blue); }
.logo span { color: var(--orange); }
.logo-sub { font-size: .65rem; font-weight: 400; color: var(--gray-600); display: block; line-height: 1; }
nav ul { display: flex; align-items: center; gap: 4px; }
nav ul li a { padding: 8px 14px; border-radius: 6px; font-size: .93rem; font-weight: 500; color: var(--gray-800); transition: var(--trans); }
nav ul li a:hover, nav ul li a.active { color: var(--blue-mid); background: #e8f4f9; }
.nav-cta { background: var(--orange) !important; color: #fff !important; border-radius: var(--radius) !important; }
.nav-cta:hover { background: var(--orange-h) !important; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.hamburger span { width: 24px; height: 2px; background: var(--blue); display: block; transition: var(--trans); }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; overflow: hidden; background: linear-gradient(135deg, var(--blue) 0%, #0d2137 60%, #1a3a5c 100%); }
.hero-bg { position: absolute; inset: 0; background-image: url('../images/hero/banner.jpg'); background-size: cover; background-position: center; opacity: .28; }
.hero-content { position: relative; z-index: 1; max-width: 680px; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.25); color: #fff; border-radius: 50px; padding: 6px 16px; font-size: .85rem; font-weight: 600; margin-bottom: 24px; }
.hero h1 { color: #fff; margin-bottom: 20px; }
.hero h1 em { color: var(--orange); font-style: normal; }
.hero-sub { font-size: 1.2rem; color: rgba(255,255,255,.82); margin-bottom: 36px; }
.hero-btns { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 48px; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 32px; border-top: 1px solid rgba(255,255,255,.15); padding-top: 32px; }
.stat-item h3 { font-size: 2rem; color: var(--orange); }
.stat-item p  { font-size: .85rem; color: rgba(255,255,255,.7); }
.hero-img-wrap { position: relative; z-index: 1; }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }

/* ---------- Cards ---------- */
.card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); transition: var(--trans); }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.card-img { width: 100%; height: 220px; object-fit: cover; }
.card-body { padding: 24px; }
.card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: var(--blue); }
.card-text  { font-size: .93rem; color: var(--gray-600); margin-bottom: 16px; }
.card-link  { font-size: .9rem; font-weight: 700; color: var(--blue-mid); display: flex; align-items: center; gap: 6px; }
.card-link:hover { color: var(--orange); }

/* ---------- Product Category Cards ---------- */
.product-card { border-radius: 14px; overflow: hidden; background: #fff; box-shadow: var(--shadow); transition: var(--trans); position: relative; }
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.product-card .badge { position: absolute; top: 16px; left: 16px; z-index: 1; }
.product-card-img { width: 100%; height: 260px; object-fit: cover; }
.product-card-body { padding: 28px; }
.product-card h3 { color: var(--blue); margin-bottom: 10px; }
.product-card p  { color: var(--gray-600); font-size: .95rem; margin-bottom: 18px; }
.product-card-features { margin-bottom: 20px; }
.product-card-features li { font-size: .9rem; padding: 4px 0; color: var(--gray-800); display: flex; align-items: center; gap: 8px; }
.product-card-features li::before { content: '✓'; color: var(--green); font-weight: 700; }

/* ---------- Features / USP ---------- */
.feature-box { text-align: center; padding: 36px 24px; background: #fff; border-radius: 14px; box-shadow: var(--shadow); transition: var(--trans); }
.feature-box:hover { box-shadow: var(--shadow-lg); }
.feature-icon { width: 64px; height: 64px; border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 28px; margin: 0 auto 20px; }
.feature-icon-blue { background: #e8f4f9; }
.feature-icon-orange { background: #fdeee9; }
.feature-icon-green { background: #e6f5ed; }
.feature-box h4 { font-size: 1.1rem; color: var(--blue); margin-bottom: 10px; }
.feature-box p  { font-size: .93rem; color: var(--gray-600); }

/* ---------- Applications ---------- */
.app-card { position: relative; border-radius: 14px; overflow: hidden; height: 280px; cursor: pointer; }
.app-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.app-card:hover img { transform: scale(1.06); }
.app-card-overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(13,33,55,.85) 0%, transparent 60%); display: flex; align-items: flex-end; padding: 24px; }
.app-card h4 { color: #fff; font-size: 1.15rem; }
.app-card p  { color: rgba(255,255,255,.8); font-size: .85rem; }

/* ---------- Promo / CTA Banner ---------- */
.cta-banner { background: linear-gradient(135deg, var(--blue) 0%, var(--blue-mid) 100%); padding: 72px 0; text-align: center; }
.cta-banner h2 { color: #fff; margin-bottom: 14px; }
.cta-banner p  { color: rgba(255,255,255,.82); font-size: 1.1rem; margin-bottom: 36px; }
.cta-banner .btns { display: flex; justify-content: center; flex-wrap: wrap; gap: 16px; }

/* ---------- Stats Bar ---------- */
.stats-bar { background: var(--blue); padding: 48px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-num  { font-size: 2.4rem; font-weight: 800; color: var(--orange); }
.stat-label { font-size: .9rem; color: rgba(255,255,255,.75); margin-top: 4px; }

/* ---------- Process Steps ---------- */
.steps { display: flex; gap: 0; position: relative; }
.steps::before { content: ''; position: absolute; top: 32px; left: 0; right: 0; height: 2px; background: var(--gray-200); z-index: 0; }
.step { flex: 1; text-align: center; position: relative; z-index: 1; }
.step-num { width: 64px; height: 64px; border-radius: 50%; background: var(--blue); color: #fff; font-size: 1.3rem; font-weight: 800; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; border: 4px solid #fff; box-shadow: 0 0 0 3px var(--blue-mid); }
.step h4 { font-size: 1rem; color: var(--blue); margin-bottom: 6px; }
.step p  { font-size: .85rem; color: var(--gray-600); padding: 0 12px; }

/* ---------- Table ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.spec-table th { background: var(--blue); color: #fff; padding: 12px 16px; text-align: left; font-weight: 600; }
.spec-table td { padding: 12px 16px; border-bottom: 1px solid var(--gray-200); }
.spec-table tr:nth-child(even) td { background: var(--gray-100); }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--gray-200); }
.faq-q { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; cursor: pointer; font-weight: 600; color: var(--blue); font-size: 1rem; }
.faq-q .icon { font-size: 1.3rem; transition: var(--trans); color: var(--orange); }
.faq-q.open .icon { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-a p { padding-bottom: 18px; color: var(--gray-600); font-size: .95rem; }

/* ---------- Contact Form ---------- */
.form-wrap { background: #fff; border-radius: 16px; padding: 40px; box-shadow: var(--shadow-lg); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: .9rem; font-weight: 600; color: var(--blue); margin-bottom: 6px; }
.form-group input,
.form-group select,
.form-group textarea { width: 100%; padding: 12px 16px; border: 1.5px solid var(--gray-400); border-radius: var(--radius); font-size: .95rem; color: var(--text); transition: var(--trans); outline: none; }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--blue-mid); box-shadow: 0 0 0 3px rgba(26,107,138,.12); }
.form-group textarea { resize: vertical; min-height: 120px; }

/* ---------- Page Hero (inner pages) ---------- */
.page-hero { background: linear-gradient(135deg, var(--blue) 0%, #0d2137 100%); padding: 80px 0 60px; }
.page-hero h1 { color: #fff; }
.page-hero p  { color: rgba(255,255,255,.8); font-size: 1.1rem; margin-top: 12px; max-width: 600px; }
.breadcrumb { display: flex; gap: 8px; align-items: center; font-size: .85rem; color: rgba(255,255,255,.6); margin-bottom: 16px; }
.breadcrumb a { color: rgba(255,255,255,.75); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span { color: rgba(255,255,255,.4); }

/* ---------- Product Detail Page ---------- */
.product-detail { padding: 64px 0; }
.product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.product-detail-imgs { position: sticky; top: 100px; }
.main-img { border-radius: 12px; overflow: hidden; margin-bottom: 12px; }
.main-img img { width: 100%; height: 420px; object-fit: cover; }
.thumb-row { display: flex; gap: 10px; }
.thumb { border-radius: 8px; overflow: hidden; flex: 1; cursor: pointer; border: 2px solid transparent; transition: var(--trans); }
.thumb img { width: 100%; height: 90px; object-fit: cover; }
.thumb.active, .thumb:hover { border-color: var(--blue-mid); }
.product-name { color: var(--blue); margin-bottom: 12px; }
.product-tagline { font-size: 1.05rem; color: var(--gray-600); margin-bottom: 24px; }
.highlight-list li { padding: 10px 0; border-bottom: 1px solid var(--gray-200); display: flex; align-items: flex-start; gap: 12px; font-size: .95rem; }
.highlight-list li::before { content: '✓'; color: var(--green); font-weight: 800; flex-shrink: 0; margin-top: 2px; }
.product-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }

/* ---------- Blog ---------- */
.blog-card { border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); transition: var(--trans); background: #fff; }
.blog-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.blog-card img { width: 100%; height: 200px; object-fit: cover; }
.blog-card-body { padding: 24px; }
.blog-meta { font-size: .8rem; color: var(--gray-600); margin-bottom: 10px; }
.blog-card h3 { font-size: 1.1rem; color: var(--blue); margin-bottom: 10px; }
.blog-card p  { font-size: .9rem; color: var(--gray-600); }

/* ---------- Footer ---------- */
footer { background: #0d2137; color: rgba(255,255,255,.8); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-brand p { font-size: .9rem; margin: 16px 0 24px; color: rgba(255,255,255,.6); }
.footer-logo { color: #fff; font-size: 1.4rem; font-weight: 800; }
.footer-logo span { color: var(--orange); }
.footer-contact-item { display: flex; align-items: center; gap: 10px; font-size: .9rem; margin-bottom: 10px; color: rgba(255,255,255,.7); }
footer h5 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 20px; text-transform: uppercase; letter-spacing: .06em; }
footer ul li { margin-bottom: 10px; }
footer ul li a { font-size: .9rem; color: rgba(255,255,255,.65); transition: var(--trans); }
footer ul li a:hover { color: var(--orange); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 20px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: .85rem; color: rgba(255,255,255,.45); }
.certifications { display: flex; gap: 12px; flex-wrap: wrap; }
.cert-badge { background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15); border-radius: 6px; padding: 4px 12px; font-size: .78rem; color: rgba(255,255,255,.65); font-weight: 600; }

/* ---------- WhatsApp Float ---------- */
.whatsapp-float { position: fixed; bottom: 32px; right: 32px; z-index: 9999; }
.whatsapp-btn { display: flex; align-items: center; justify-content: center; width: 60px; height: 60px; background: #25D366; border-radius: 50%; box-shadow: 0 4px 20px rgba(37,211,102,.4); transition: var(--trans); }
.whatsapp-btn:hover { transform: scale(1.1); box-shadow: 0 6px 28px rgba(37,211,102,.5); }
.whatsapp-btn svg { width: 30px; height: 30px; fill: #fff; }
.whatsapp-tooltip { position: absolute; right: 72px; top: 50%; transform: translateY(-50%); background: var(--blue); color: #fff; padding: 8px 14px; border-radius: 8px; font-size: .85rem; white-space: nowrap; opacity: 0; pointer-events: none; transition: var(--trans); }
.whatsapp-float:hover .whatsapp-tooltip { opacity: 1; }

/* ---------- Notification ---------- */
.notify { position: fixed; top: 90px; right: 24px; background: var(--green); color: #fff; padding: 14px 24px; border-radius: 8px; font-weight: 600; font-size: .95rem; z-index: 9999; transform: translateX(150%); transition: transform .4s ease; box-shadow: var(--shadow); }
.notify.show { transform: translateX(0); }

/* ---------- Section BG ---------- */
.bg-gray  { background: var(--gray-100); }
.bg-blue  { background: var(--blue); }
.bg-dark  { background: #0d2137; }

/* ---------- Image with overlay text ---------- */
.img-card { position: relative; border-radius: 12px; overflow: hidden; }
.img-card img { width: 100%; height: 280px; object-fit: cover; }
.img-card-overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(13,33,55,.8) 0%, transparent 55%); display: flex; align-items: flex-end; padding: 20px; }
.img-card-overlay h4 { color: #fff; font-size: 1rem; }

/* ---------- Tabs ---------- */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--gray-200); margin-bottom: 32px; flex-wrap: wrap; }
.tab-btn { padding: 12px 20px; border: none; background: none; font-size: .95rem; font-weight: 600; color: var(--gray-600); cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -2px; transition: var(--trans); }
.tab-btn.active { color: var(--blue-mid); border-bottom-color: var(--blue-mid); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
}

@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .hero { min-height: auto; padding: 80px 0 60px; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-img-wrap { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .product-detail-imgs { position: static; }
  .steps { flex-direction: column; }
  .steps::before { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  nav { display: none; position: absolute; top: 72px; left: 0; right: 0; background: #fff; box-shadow: var(--shadow); padding: 16px; }
  nav.open { display: block; }
  nav ul { flex-direction: column; gap: 4px; }
  nav ul li a { display: block; padding: 10px 16px; }
  .hamburger { display: flex; }
  .hero-stats { gap: 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { flex-direction: column; text-align: center; }
  h1 { font-size: 2rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .btn { padding: 12px 20px; font-size: .9rem; }
  .form-wrap { padding: 24px 16px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}