/* ================================================
   OnlyJia Industrial Tape - SEO Optimized Design
   ================================================ */

:root {
  --bg: #09090e;
  --bg2: #0e0e16;
  --bg3: #13131f;
  --card: #16161f;
  --border: rgba(255,255,255,0.07);
  --text: #ffffff;
  --text2: rgba(255,255,255,0.55);
  --text3: rgba(255,255,255,0.3);
  --accent: #f97316;
  --accent2: #3b82f6;
  --accent3: #06b6d4;
  --green: #10b981;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --font: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

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

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ===== LAYOUT ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-dark { background: var(--bg2); }

/* ===== NAV ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 0 24px; height: 72px;
  display: flex; align-items: center; justify-content: space-between;
  transition: all 0.3s;
  background: transparent;
}
.nav.scrolled { background: rgba(9,9,14,0.95); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); }

.nav-logo { font-size: 22px; font-weight: 900; color: var(--text); text-decoration: none; letter-spacing: -0.5px; }
.nav-logo span { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a { color: var(--text2); text-decoration: none; font-size: 14px; font-weight: 500; transition: color 0.3s; }
.nav-links a:hover { color: var(--text); }

.nav-right { display: flex; align-items: center; gap: 20px; }

.nav-cta {
  background: var(--accent); color: #fff; padding: 10px 22px; border-radius: 6px;
  text-decoration: none; font-size: 13px; font-weight: 700; letter-spacing: 0.5px;
  transition: all 0.3s; border: 2px solid var(--accent);
}
.nav-cta:hover { background: transparent; color: var(--accent); }

.lang-switcher { display: flex; gap: 4px; }
.lang-switcher .lang {
  color: var(--text3); text-decoration: none; font-size: 12px; font-weight: 600;
  padding: 4px 8px; border-radius: 4px; transition: all 0.2s;
}
.lang-switcher .lang:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.lang-switcher .lang.active { color: var(--accent); background: rgba(249,115,22,0.1); }

.nav-toggle { background: none; border: none; cursor: pointer; display: none; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: #fff; margin: 5px 0; }

/* ===== HERO ===== */
.hero { min-height: 100vh; position: relative; overflow: hidden; display: flex; align-items: center; }
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(249,115,22,0.12) 0%, transparent 55%), radial-gradient(ellipse at 70% 20%, rgba(59,130,246,0.1) 0%, transparent 50%), radial-gradient(ellipse at 50% 80%, rgba(6,182,212,0.08) 0%, transparent 50%);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-content { position: relative; z-index: 2; max-width: 1200px; margin: 0 auto; padding: 120px 24px 80px; width: 100%; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(249,115,22,0.1); border: 1px solid rgba(249,115,22,0.25);
  color: var(--accent); padding: 8px 16px; border-radius: 50px;
  font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  margin-bottom: 28px;
}
.hero-badge::before { content: ''; width: 6px; height: 6px; background: var(--accent); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.2} }

.hero h1 { font-size: clamp(38px, 6vw, 72px); font-weight: 900; line-height: 1.05; letter-spacing: -2px; margin-bottom: 24px; }
.hero h1 .highlight { background: linear-gradient(135deg, var(--accent), var(--accent3)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 18px; color: var(--text2); max-width: 560px; margin-bottom: 36px; line-height: 1.7; }
.hero-desc strong { color: var(--text); }

.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }

.btn-primary {
  background: var(--accent); color: #fff; padding: 14px 32px; border-radius: var(--radius-sm);
  text-decoration: none; font-weight: 700; font-size: 14px; display: inline-flex; align-items: center; gap: 8px;
  transition: all 0.3s; border: 2px solid var(--accent);
}
.btn-primary:hover { background: #ea6d0f; transform: translateY(-2px); box-shadow: 0 10px 30px rgba(249,115,22,0.3); }

.btn-outline {
  background: transparent; border: 2px solid rgba(255,255,255,0.15); color: var(--text);
  padding: 14px 32px; border-radius: var(--radius-sm); text-decoration: none; font-weight: 600; font-size: 14px;
  display: inline-flex; align-items: center; gap: 8px; transition: all 0.3s;
}
.btn-outline:hover { border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.04); }

.btn-ghost { background: transparent; border: none; color: var(--accent); padding: 14px 0; text-decoration: none; font-weight: 600; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; transition: all 0.3s; }
.btn-ghost:hover { gap: 10px; }

.hero-trust { display: flex; flex-direction: column; gap: 8px; }
.hero-trust > span { font-size: 12px; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; }
.trust-flags { font-size: 15px; color: var(--text2); font-weight: 500; }

/* ===== SECTION HEADER ===== */
.section-label { display: inline-block; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 3px; color: var(--accent); margin-bottom: 12px; }
.section-title { font-size: clamp(26px, 4vw, 42px); font-weight: 900; letter-spacing: -1px; line-height: 1.15; margin-bottom: 14px; }
.section-desc { font-size: 17px; color: var(--text2); max-width: 520px; line-height: 1.7; }
.section-header { margin-bottom: 60px; }
.section-header.centered { text-align: center; }
.section-header.centered .section-desc { margin: 0 auto; }

/* ===== PRODUCT FEATURE ===== */
.product-feature { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; margin-bottom: 80px; padding: 48px; background: var(--card); border: 1px solid var(--border); border-radius: 16px; }
.product-feature.reverse { direction: rtl; }
.product-feature.reverse > * { direction: ltr; }
.product-badge { display: inline-block; background: rgba(249,115,22,0.12); border: 1px solid rgba(249,115,22,0.25); color: var(--accent); padding: 4px 12px; border-radius: 50px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; }
.product-feature h2 { font-size: 28px; font-weight: 900; letter-spacing: -0.5px; margin-bottom: 6px; }
.product-subtitle { font-size: 13px; color: var(--accent3); font-weight: 600; margin-bottom: 14px; letter-spacing: 0.5px; }
.product-desc { font-size: 15px; color: var(--text2); line-height: 1.8; margin-bottom: 20px; }
.product-specs { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 24px; }
.spec-item { background: rgba(255,255,255,0.04); border: 1px solid var(--border); border-radius: 6px; padding: 10px 14px; }
.spec-label { display: block; font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 2px; }
.spec-value { font-size: 14px; font-weight: 600; color: var(--text); }
.product-actions { display: flex; gap: 16px; align-items: center; }
.product-feature-img img { width: 100%; border-radius: var(--radius); display: block; aspect-ratio: 6/5; object-fit: cover; }

/* ===== PRODUCT MINI GRID ===== */
.product-grid-mini { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.product-mini-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: all 0.3s; }
.product-mini-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.product-mini-icon { font-size: 32px; margin-bottom: 12px; }
.product-mini-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.product-mini-card p { font-size: 13px; color: var(--text2); line-height: 1.6; margin-bottom: 12px; }
.product-mini-card a { color: var(--accent); text-decoration: none; font-size: 13px; font-weight: 600; }

/* ===== CERTS BAR ===== */
.certs-bar { background: var(--card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 32px 0; }
.certs-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.certs-label { font-size: 11px; text-transform: uppercase; letter-spacing: 2px; color: var(--text3); margin-bottom: 20px; text-align: center; }
.certs-grid { display: flex; justify-content: center; flex-wrap: wrap; gap: 24px; }
.cert-item { display: flex; align-items: center; gap: 10px; padding: 8px 16px; background: rgba(255,255,255,0.03); border: 1px solid var(--border); border-radius: 8px; }
.cert-icon { font-size: 20px; }
.cert-item strong { display: block; font-size: 14px; color: var(--text); }
.cert-item small { font-size: 11px; color: var(--text3); }

/* ===== FACTORY ===== */
.factory-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.factory-img { position: relative; border-radius: var(--radius); overflow: hidden; background: var(--bg3); min-height: 360px; display: flex; align-items: center; justify-content: center; border: 1px solid var(--border); }
.factory-img-inner { text-align: center; color: var(--text3); }
.factory-img-inner span { display: block; font-size: 80px; margin-bottom: 16px; }
.factory-badge { position: absolute; bottom: 16px; left: 16px; background: var(--accent); color: #fff; padding: 8px 16px; border-radius: 6px; font-size: 13px; font-weight: 700; }
.factory-content h2 { font-size: 30px; font-weight: 900; letter-spacing: -0.5px; margin-bottom: 20px; }
.factory-content p { font-size: 15px; color: var(--text2); line-height: 1.8; margin-bottom: 16px; }
.factory-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 28px 0; }
.fstat { text-align: center; padding: 16px; background: rgba(255,255,255,0.03); border: 1px solid var(--border); border-radius: 8px; }
.fstat-num { font-size: 24px; font-weight: 900; color: var(--text); }
.fstat-num span { font-size: 13px; color: var(--accent); margin-left: 2px; }
.fstat-label { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.5px; margin-top: 4px; }
.factory-certs { display: flex; flex-wrap: wrap; gap: 8px; }
.cert-tag { background: rgba(255,255,255,0.04); border: 1px solid var(--border); color: var(--text2); padding: 6px 14px; border-radius: 6px; font-size: 13px; font-weight: 600; }

/* ===== INDUSTRIES ===== */
.industries-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.industry-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: all 0.3s; }
.industry-card:hover { border-color: var(--accent2); transform: translateY(-3px); }
.industry-icon { font-size: 36px; margin-bottom: 14px; }
.industry-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.industry-card > p { font-size: 14px; color: var(--text2); line-height: 1.6; margin-bottom: 14px; }
.industry-card ul { list-style: none; }
.industry-card li { font-size: 13px; color: var(--text2); padding: 4px 0; padding-left: 14px; position: relative; }
.industry-card li::before { content: '→'; position: absolute; left: 0; color: var(--accent); font-size: 11px; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 8px; }
.faq-item { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: border-color 0.3s; }
.faq-item[open] { border-color: var(--accent); }
.faq-question { padding: 20px 24px; font-size: 16px; font-weight: 600; color: var(--text); cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; background: none; border: none; width: 100%; text-align: left; font-family: inherit; }
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after { content: '+'; font-size: 24px; color: var(--accent); font-weight: 300; }
.faq-item[open] .faq-question::after { content: '−'; }
.faq-answer { padding: 0 24px 20px; }
.faq-answer p { font-size: 15px; color: var(--text2); line-height: 1.8; }

/* ===== CONTACT ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 12px; }
.contact-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; display: flex; gap: 14px; align-items: flex-start; }
.contact-icon { width: 44px; height: 44px; background: rgba(249,115,22,0.1); border: 1px solid rgba(249,115,22,0.2); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.contact-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.contact-card p { font-size: 14px; color: var(--text2); }
.contact-card small { font-size: 12px; color: var(--text3); display: block; margin-top: 4px; }
.contact-sample-note { background: rgba(249,115,22,0.08); border: 1px solid rgba(249,115,22,0.2); border-radius: var(--radius); padding: 20px; margin-top: 4px; }
.contact-sample-note h4 { font-size: 15px; font-weight: 700; margin-bottom: 6px; color: var(--accent); }
.contact-sample-note p { font-size: 14px; color: var(--text2); }

.contact-form-wrap { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 12px; font-weight: 700; color: var(--text2); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 12px 14px; background: rgba(255,255,255,0.04); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-size: 14px; font-family: inherit; transition: all 0.3s; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--accent); background: rgba(249,115,22,0.05); }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text3); }
.form-group select option { background: var(--bg); }
.form-group textarea { height: 120px; resize: vertical; }
.form-submit { width: 100%; background: var(--accent); color: #fff; border: none; padding: 15px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; cursor: pointer; transition: all 0.3s; margin-top: 4px; }
.form-submit:hover { background: #ea6d0f; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(249,115,22,0.25); }

/* ===== FOOTER ===== */
.footer { background: #06060a; border-top: 1px solid var(--border); padding: 64px 0 30px; }
.footer-main { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand h3 { font-size: 22px; font-weight: 900; margin-bottom: 12px; }
.footer-brand h3 span { color: var(--accent); }
.footer-brand > p { font-size: 14px; color: var(--text3); line-height: 1.7; max-width: 320px; margin-bottom: 16px; }
.footer-contact p { font-size: 13px; color: var(--text2); margin-bottom: 6px; }
.footer h4 { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 2px; color: var(--text2); margin-bottom: 16px; }
.footer a { display: block; color: var(--text3); text-decoration: none; font-size: 14px; margin-bottom: 10px; transition: color 0.3s; }
.footer a:hover { color: var(--accent); }
.footer-bottom { max-width: 1200px; margin: 0 auto; padding: 24px 24px 0; border-top: 1px solid var(--border); display: flex; justify-content: space-between; font-size: 13px; color: var(--text3); }

/* ===== ANIMATIONS ===== */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s, transform 0.6s; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .factory-grid { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; }
  .product-grid-mini { grid-template-columns: repeat(2, 1fr); }
  .industries-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .hero-trust { display: none; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-right .lang-switcher { display: none; }
  .nav-toggle { display: block; }
  .section { padding: 64px 0; }
  .product-feature { grid-template-columns: 1fr; gap: 24px; direction: ltr !important; padding: 28px; }
  .product-feature.reverse > * { direction: ltr; }
  .product-grid-mini { grid-template-columns: 1fr; }
  .industries-grid { grid-template-columns: 1fr; }
  .certs-grid { gap: 12px; }
  .cert-item { padding: 6px 10px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .hero-content { padding: 100px 24px 60px; }
  .hero h1 { letter-spacing: -0.5px; }
  .factory-stats { grid-template-columns: 1fr 1fr; }
  .product-specs { grid-template-columns: 1fr; }
}