/* =========================================================
   DAER 达尔新型材料 — Corporate Website Redesign
   Brand palette derived from official site primary #0C77BB
   ========================================================= */
:root {
  --blue: #0C77BB;
  --blue-deep: #075A8C;
  --blue-dark: #0A2A43;
  --navy: #07203A;
  --cyan: #2EA8E0;
  --cyan-light: #E3F2FC;
  --green: #2FA97C;
  --ink: #17242F;
  --gray: #5A6B78;
  --line: #E3EBF2;
  --bg: #F5F9FC;
  --white: #FFFFFF;
  --shadow-sm: 0 2px 10px rgba(10, 42, 67, .07);
  --shadow-md: 0 10px 30px rgba(10, 42, 67, .10);
  --shadow-lg: 0 24px 60px rgba(10, 42, 67, .16);
  --radius: 14px;
  --radius-lg: 20px;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --trans: .35s cubic-bezier(.4, 0, .2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: color var(--trans); }
ul { list-style: none; }
.icon { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }

.container { width: min(1200px, 92%); margin: 0 auto; }

/* ---------- Topbar ---------- */
.topbar { background: var(--navy); color: rgba(255,255,255,.82); font-size: 13px; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; min-height: 38px; gap: 16px; }
.topbar-group { display: flex; align-items: center; gap: 20px; }
.topbar-item { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; }
.topbar-item .icon { font-size: 15px; color: var(--cyan); }
.topbar a:hover { color: #fff; }
.lang-switch { display: flex; align-items: center; gap: 2px; background: rgba(255,255,255,.08); border-radius: 99px; padding: 3px; }
.lang-switch a { padding: 2px 11px; border-radius: 99px; font-size: 12px; color: rgba(255,255,255,.75); transition: all var(--trans); white-space: nowrap; }
.lang-switch a:hover { color: #fff; }
.lang-switch a.active { background: var(--blue); color: #fff; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 900;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--trans), border-color var(--trans);
}
.site-header.scrolled { box-shadow: var(--shadow-md); border-color: var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 84px; transition: height var(--trans); }
.site-header.scrolled .header-inner { height: 68px; }

.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand svg { height: 46px; width: auto; transition: height var(--trans); }
.site-header.scrolled .brand svg { height: 40px; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  position: relative; padding: 10px 16px; font-size: 15.5px; font-weight: 500; color: var(--ink);
  border-radius: 8px; white-space: nowrap;
}
.main-nav a::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 4px; height: 2px;
  background: var(--blue); border-radius: 2px; transform: scaleX(0); transform-origin: left;
  transition: transform var(--trans);
}
.main-nav a:hover, .main-nav a.active { color: var(--blue); }
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }

.header-cta { display: inline-flex; align-items: center; gap: 8px; background: var(--blue); color: #fff; padding: 11px 22px; border-radius: 99px; font-size: 14.5px; font-weight: 600; box-shadow: 0 6px 18px rgba(12,119,187,.35); transition: all var(--trans); white-space: nowrap; }
.header-cta:hover { background: var(--blue-deep); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(12,119,187,.42); color: #fff; }
.header-cta .icon { font-size: 17px; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 42px; height: 42px; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: all var(--trans); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; height: min(92vh, 860px); min-height: 560px; overflow: hidden; background: var(--navy); }
.hero-slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity 1.1s ease, visibility 1.1s; }
.hero-slide.is-active { opacity: 1; visibility: visible; z-index: 2; }
.hero-slide::before {
  content: ""; position: absolute; inset: -60px;
  background-size: cover; background-position: center;
  animation: kenburns 9s ease-out forwards;
}
.hero-slide:nth-of-type(1)::before { background-image: url('../img/banner-floor.jpg'); }
.hero-slide:nth-of-type(2)::before { background-image: url('../img/banner-marine.jpg'); }
.hero-slide:nth-of-type(3)::before { background-image: url('../img/banner-polyurea.jpg'); }
.hero-slide.is-active::before { animation-play-state: running; }
@keyframes kenburns { from { transform: scale(1.14) translateX(2%); } to { transform: scale(1) translateX(0); } }
.hero-slide::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(7,32,58,.88) 8%, rgba(9,48,86,.55) 42%, rgba(7,32,58,.18) 78%),
              linear-gradient(to top, rgba(7,32,58,.55), transparent 34%);
}
.hero-content { position: relative; z-index: 3; height: 100%; display: flex; flex-direction: column; justify-content: center; color: #fff; padding-bottom: 90px; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px; width: fit-content;
  padding: 7px 16px; border: 1px solid rgba(255,255,255,.35); border-radius: 99px;
  font-size: 13.5px; letter-spacing: 2px; background: rgba(255,255,255,.08);
  backdrop-filter: blur(6px); margin-bottom: 22px;
  opacity: 0; transform: translateY(24px); animation: rise .8s .25s forwards;
}
.hero-tag .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 4px rgba(46,168,224,.25); }
.hero-content h2 { font-size: clamp(2rem, 4.6vw, 3.7rem); font-weight: 800; line-height: 1.22; letter-spacing: .01em; max-width: 760px; text-shadow: 0 4px 30px rgba(0,0,0,.25); opacity: 0; transform: translateY(30px); animation: rise .85s .4s forwards; }
.hero-content p { font-size: clamp(1rem, 1.4vw, 1.2rem); color: rgba(255,255,255,.85); max-width: 620px; margin-top: 18px; opacity: 0; transform: translateY(30px); animation: rise .85s .55s forwards; }
.hero-cta { display: flex; gap: 16px; margin-top: 36px; flex-wrap: wrap; opacity: 0; transform: translateY(30px); animation: rise .85s .7s forwards; }
@keyframes rise { to { opacity: 1; transform: translateY(0); } }

.btn { display: inline-flex; align-items: center; gap: 10px; padding: 14px 32px; border-radius: 99px; font-size: 15.5px; font-weight: 600; transition: all var(--trans); cursor: pointer; border: 0; }
.btn .icon { font-size: 18px; transition: transform var(--trans); }
.btn:hover .icon { transform: translateX(4px); }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 10px 26px rgba(12,119,187,.4); }
.btn-primary:hover { background: var(--blue-deep); transform: translateY(-3px); color: #fff; }
.btn-ghost { border: 1.5px solid rgba(255,255,255,.55); color: #fff; background: rgba(255,255,255,.06); backdrop-filter: blur(4px); }
.btn-ghost:hover { background: rgba(255,255,255,.16); border-color: #fff; color: #fff; transform: translateY(-3px); }

.hero-nav { position: absolute; z-index: 5; bottom: 118px; left: 0; right: 0; }
.hero-nav-inner { display: flex; align-items: center; gap: 22px; }
.hero-dots { display: flex; gap: 10px; }
.hero-dots button { width: 34px; height: 4px; border: 0; border-radius: 4px; background: rgba(255,255,255,.32); cursor: pointer; position: relative; overflow: hidden; transition: background var(--trans); }
.hero-dots button::after { content: ""; position: absolute; inset: 0; background: #fff; transform: scaleX(0); transform-origin: left; }
.hero-dots button.active { background: rgba(255,255,255,.32); }
.hero-dots button.active::after { animation: dotfill 6s linear forwards; }
@keyframes dotfill { to { transform: scaleX(1); } }
.hero-arrows { display: flex; gap: 10px; margin-left: auto; }
.hero-arrows button {
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid rgba(255,255,255,.4);
  background: rgba(255,255,255,.08); color: #fff; cursor: pointer; display: grid; place-items: center;
  transition: all var(--trans); backdrop-filter: blur(4px);
}
.hero-arrows button:hover { background: var(--blue); border-color: var(--blue); }
.hero-arrows .icon { font-size: 19px; }

/* ---------- Stats strip ---------- */
.stats { position: relative; z-index: 10; margin-top: -74px; }
.stats-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.stat-card {
  background: #fff; border-radius: var(--radius); padding: 26px 18px 22px; text-align: center;
  box-shadow: var(--shadow-md); border-bottom: 3px solid transparent; transition: all var(--trans);
  opacity: 0; transform: translateY(26px);
}
.stat-card.in { opacity: 1; transform: none; transition: opacity .7s var(--i, 0s) ease, transform .7s var(--i, 0s) ease, box-shadow var(--trans), border-color var(--trans); }
.stat-card:hover { transform: translateY(-6px); border-bottom-color: var(--blue); box-shadow: var(--shadow-lg); }
.stat-num { font-size: clamp(1.7rem, 2.6vw, 2.4rem); font-weight: 800; color: var(--blue); line-height: 1.15; font-variant-numeric: tabular-nums; }
.stat-num small { font-size: .55em; font-weight: 700; margin-left: 2px; }
.stat-label { margin-top: 6px; font-size: 13.5px; color: var(--gray); }

/* ---------- Sections ---------- */
.section { padding: 96px 0; }
.section-alt { background: var(--bg); }
.section-head { max-width: 720px; margin: 0 auto 54px; text-align: center; }
.section-tag {
  display: inline-flex; align-items: center; gap: 10px; color: var(--blue); font-size: 13.5px;
  font-weight: 700; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 14px;
}
.section-tag::before, .section-tag::after { content: ""; width: 26px; height: 2px; background: var(--blue); border-radius: 2px; opacity: .55; }
.section-head h2 { font-size: clamp(1.7rem, 3vw, 2.5rem); font-weight: 800; line-height: 1.3; }
.section-head p { color: var(--gray); margin-top: 14px; font-size: 16px; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: center; }
.about-media { position: relative; }
.about-media .img-main { border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); aspect-ratio: 16/11.4; object-fit: cover; width: 100%; }
.about-media .img-sub {
  position: absolute; right: -8%; bottom: -14%; width: 46%; border-radius: var(--radius);
  box-shadow: var(--shadow-lg); border: 6px solid #fff; aspect-ratio: 1; object-fit: cover;
  animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.exp-badge {
  position: absolute; top: -26px; left: -20px; background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff; border-radius: var(--radius); padding: 18px 22px; box-shadow: 0 14px 34px rgba(12,119,187,.4);
  animation: float 7s .8s ease-in-out infinite;
}
.exp-badge b { display: block; font-size: 30px; font-weight: 800; line-height: 1.1; }
.exp-badge span { font-size: 13px; opacity: .92; }
.about-copy .section-tag { margin-bottom: 12px; }
.about-copy h2 { font-size: clamp(1.6rem, 2.6vw, 2.3rem); font-weight: 800; line-height: 1.35; margin-bottom: 18px; }
.about-copy p { color: var(--gray); margin-bottom: 14px; }
.feature-list { margin: 26px 0 30px; display: grid; gap: 16px; }
.feature-item { display: flex; gap: 16px; align-items: flex-start; }
.feature-icon {
  width: 52px; height: 52px; border-radius: 13px; display: grid; place-items: center; flex-shrink: 0;
  background: var(--cyan-light); color: var(--blue); font-size: 25px; transition: all var(--trans);
}
.feature-item:hover .feature-icon { background: var(--blue); color: #fff; transform: rotate(-6deg) scale(1.06); }
.feature-item h4 { font-size: 16.5px; font-weight: 700; }
.feature-item p { font-size: 14px; color: var(--gray); margin: 3px 0 0; }

/* ---------- Products ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 24px; }
.prod-card {
  grid-column: span 2; background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm); border: 1px solid var(--line); transition: all var(--trans);
  display: flex; flex-direction: column;
}
.prod-card:first-child { grid-column: span 3; }
.prod-card:nth-child(2) { grid-column: span 3; }
.prod-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; }
.prod-media { position: relative; overflow: hidden; aspect-ratio: 16/9.4; }
.prod-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s cubic-bezier(.2,.6,.2,1); }
.prod-card:hover .prod-media img { transform: scale(1.08); }
.prod-chip {
  position: absolute; top: 16px; left: 16px; background: rgba(255,255,255,.92); color: var(--blue);
  border-radius: 99px; width: 44px; height: 44px; display: grid; place-items: center; font-size: 22px;
  box-shadow: var(--shadow-sm); backdrop-filter: blur(4px);
}
.prod-body { padding: 24px 26px 26px; display: flex; flex-direction: column; flex: 1; }
.prod-body h3 { font-size: 19px; font-weight: 700; line-height: 1.4; }
.prod-body h3 em { font-style: normal; color: var(--blue); font-size: 13px; display: block; letter-spacing: 1px; margin-bottom: 5px; font-weight: 600; }
.prod-body p { color: var(--gray); font-size: 14.5px; margin-top: 10px; flex: 1; }
.prod-link { margin-top: 18px; display: inline-flex; align-items: center; gap: 8px; color: var(--blue); font-weight: 600; font-size: 14.5px; }
.prod-link .icon { transition: transform var(--trans); }
.prod-card:hover .prod-link .icon { transform: translateX(5px); }

/* ---------- Strength (dark) ---------- */
.strength { background: linear-gradient(160deg, var(--navy) 0%, var(--blue-dark) 55%, #0B3E63 100%); color: #fff; position: relative; overflow: hidden; }
.strength::before {
  content: ""; position: absolute; inset: 0; opacity: .5; pointer-events: none;
  background-image: radial-gradient(rgba(46,168,224,.14) 1px, transparent 1.6px); background-size: 26px 26px;
}
.strength .section-tag { color: var(--cyan); }
.strength .section-tag::before, .strength .section-tag::after { background: var(--cyan); }
.strength .section-head p { color: rgba(255,255,255,.68); }
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; position: relative; }
.cert-card {
  display: flex; gap: 18px; align-items: center; padding: 26px 24px;
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius);
  transition: all var(--trans); backdrop-filter: blur(6px);
}
.cert-card:hover { background: rgba(46,168,224,.14); border-color: rgba(46,168,224,.5); transform: translateY(-5px); }
.cert-icon { width: 58px; height: 58px; flex-shrink: 0; border-radius: 14px; background: linear-gradient(135deg, var(--blue), var(--cyan)); display: grid; place-items: center; font-size: 28px; color: #fff; box-shadow: 0 8px 20px rgba(12,119,187,.45); }
.cert-card h4 { font-size: 17px; font-weight: 700; }
.cert-card p { font-size: 13px; color: rgba(255,255,255,.62); margin-top: 3px; }
.patent-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 44px; position: relative; }
.patent-cell { text-align: center; padding: 26px 10px; border: 1px dashed rgba(255,255,255,.22); border-radius: var(--radius); transition: all var(--trans); }
.patent-cell:hover { border-color: var(--cyan); background: rgba(46,168,224,.08); }
.patent-cell b { display: block; font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 800; background: linear-gradient(180deg, #fff, #8FD4FF); -webkit-background-clip: text; background-clip: text; color: transparent; font-variant-numeric: tabular-nums; }
.patent-cell b small { font-size: .5em; }
.patent-cell span { font-size: 13.5px; color: rgba(255,255,255,.66); }

/* ---------- Applications ---------- */
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.app-card {
  position: relative; padding: 34px 30px; border-radius: var(--radius-lg); background: #fff;
  border: 1px solid var(--line); overflow: hidden; transition: all var(--trans);
}
.app-card::before { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, var(--blue), var(--cyan)); opacity: 0; transition: opacity var(--trans); }
.app-card:hover { transform: translateY(-7px); box-shadow: var(--shadow-lg); border-color: transparent; }
.app-card:hover::before { opacity: 1; }
.app-card > * { position: relative; }
.app-icon { width: 62px; height: 62px; border-radius: 16px; background: var(--cyan-light); color: var(--blue); display: grid; place-items: center; font-size: 30px; margin-bottom: 18px; transition: all var(--trans); }
.app-card:hover .app-icon { background: rgba(255,255,255,.18); color: #fff; }
.app-card h4 { font-size: 17.5px; font-weight: 700; transition: color var(--trans); }
.app-card p { font-size: 14px; color: var(--gray); margin-top: 8px; transition: color var(--trans); }
.app-card:hover h4 { color: #fff; }
.app-card:hover p { color: rgba(255,255,255,.82); }

/* ---------- Marquee ---------- */
.marquee-section { padding: 40px 0 90px; background: var(--bg); overflow: hidden; }
.marquee { display: flex; gap: 14px; width: max-content; animation: scrollx 30s linear infinite; }
.marquee:hover { animation-play-state: paused; }
@keyframes scrollx { to { transform: translateX(-50%); } }
.marquee-chip {
  display: inline-flex; align-items: center; gap: 10px; padding: 14px 28px; border-radius: 99px;
  background: #fff; border: 1px solid var(--line); font-weight: 600; font-size: 15px; color: var(--blue-dark);
  box-shadow: var(--shadow-sm); white-space: nowrap;
}
.marquee-chip .icon { color: var(--blue); font-size: 19px; }

/* ---------- FAQ ---------- */
.faq-wrap { max-width: 860px; margin: 0 auto; display: grid; gap: 16px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: all var(--trans); }
.faq-item.open { box-shadow: var(--shadow-md); border-color: rgba(12,119,187,.35); }
.faq-q {
  width: 100%; background: none; border: 0; cursor: pointer; text-align: left;
  display: flex; align-items: center; gap: 16px; padding: 21px 24px; font-size: 16.5px; font-weight: 600; color: var(--ink); font-family: inherit;
}
.faq-q .faq-badge { width: 34px; height: 34px; border-radius: 10px; background: var(--cyan-light); color: var(--blue); display: grid; place-items: center; font-weight: 800; font-size: 14.5px; flex-shrink: 0; transition: all var(--trans); }
.faq-item.open .faq-badge { background: var(--blue); color: #fff; }
.faq-q .faq-x { margin-left: auto; width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--line); display: grid; place-items: center; color: var(--gray); transition: all var(--trans); flex-shrink: 0; }
.faq-item.open .faq-x { transform: rotate(45deg); background: var(--blue); border-color: var(--blue); color: #fff; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .45s cubic-bezier(.4,0,.2,1); }
.faq-a p { padding: 0 24px 22px 74px; color: var(--gray); font-size: 15px; }

/* ---------- CTA band ---------- */
.cta-band { position: relative; padding: 74px 0; background: linear-gradient(115deg, var(--blue) 0%, var(--blue-deep) 60%, var(--blue-dark) 100%); color: #fff; overflow: hidden; }
.cta-band::before { content: ""; position: absolute; right: -140px; top: -140px; width: 440px; height: 440px; border-radius: 50%; border: 70px solid rgba(255,255,255,.07); }
.cta-band::after { content: ""; position: absolute; right: 60px; bottom: -190px; width: 340px; height: 340px; border-radius: 50%; border: 54px solid rgba(255,255,255,.05); }
.cta-inner { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-inner h3 { font-size: clamp(1.4rem, 2.4vw, 2rem); font-weight: 800; }
.cta-inner p { opacity: .85; margin-top: 8px; }
.cta-band .btn-white { background: #fff; color: var(--blue); box-shadow: 0 12px 30px rgba(0,0,0,.22); }
.cta-band .btn-white:hover { transform: translateY(-3px); color: var(--blue-deep); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.contact-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 36px 34px; transition: all var(--trans); position: relative; overflow: hidden; }
.contact-card::after { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: linear-gradient(var(--blue), var(--cyan)); }
.contact-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-5px); }
.contact-card .co-type { font-size: 12.5px; letter-spacing: 2px; color: var(--blue); font-weight: 700; text-transform: uppercase; }
.contact-card h3 { font-size: 21px; font-weight: 800; margin: 8px 0 18px; }
.contact-line { display: flex; gap: 14px; align-items: flex-start; padding: 9px 0; color: var(--gray); font-size: 15px; }
.contact-line .icon { color: var(--blue); font-size: 19px; margin-top: 4px; }
.contact-line a { font-weight: 600; color: var(--ink); }
.contact-line a:hover { color: var(--blue); }
.contact-line small { display: block; font-size: 12.5px; color: #8b9aa5; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy); color: rgba(255,255,255,.72); font-size: 14.5px; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 44px; padding: 70px 0 50px; }
.footer-brand svg { height: 48px; width: auto; }
.footer-brand p { margin-top: 18px; line-height: 1.8; font-size: 14px; }
.footer-col h5 { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 20px; position: relative; padding-bottom: 12px; }
.footer-col h5::after { content: ""; position: absolute; left: 0; bottom: 0; width: 28px; height: 2px; background: var(--cyan); border-radius: 2px; }
.footer-col li { margin-bottom: 11px; }
.footer-col a:hover { color: var(--cyan); }
.footer-col .contact-line { padding: 5px 0; font-size: 13.5px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 20px 0; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; color: rgba(255,255,255,.45); }
.footer-bottom a:hover { color: var(--cyan); }

/* ---------- Floating ---------- */
.to-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 800; width: 50px; height: 50px; border-radius: 50%;
  background: var(--blue); color: #fff; border: 0; cursor: pointer; display: grid; place-items: center;
  font-size: 20px; box-shadow: 0 10px 26px rgba(12,119,187,.42); opacity: 0; visibility: hidden;
  transform: translateY(16px); transition: all var(--trans);
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--blue-deep); transform: translateY(-4px); }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.65,.25,1); transition-delay: var(--d, 0s); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal, .stat-card { opacity: 1 !important; transform: none !important; transition: none !important; }
  .hero-slide::before { animation: none; }
  .about-media .img-sub, .exp-badge { animation: none; }
}

/* ---------- Responsive / H5 ---------- */
@media (max-width: 1080px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex; flex-direction: column; align-items: stretch; gap: 2px;
    position: absolute; top: 100%; left: 0; right: 0; background: #fff; padding: 14px 5%;
    box-shadow: 0 24px 40px rgba(10,42,67,.14); border-top: 1px solid var(--line);
    animation: navdrop .3s ease;
  }
  @keyframes navdrop { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }
  .main-nav.open a { padding: 13px 12px; border-radius: 10px; }
  .main-nav.open a:hover, .main-nav.open a.active { background: var(--cyan-light); }
  .nav-toggle { display: flex; }
  .header-cta { display: none; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 60px; }
  .about-media { margin-right: 8%; }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-card, .prod-card:first-child, .prod-card:nth-child(2) { grid-column: span 1; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 36px; }
}
@media (max-width: 680px) {
  body { font-size: 15px; }
  .topbar-group:first-child .topbar-item:nth-child(2) { display: none; }
  .hero { height: 88vh; min-height: 540px; }
  .hero-content { padding-bottom: 130px; }
  .hero-nav { bottom: 34px; }
  .hero-cta .btn { padding: 12px 24px; font-size: 14.5px; width: 100%; justify-content: center; }
  .stats { margin-top: -56px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat-card { padding: 20px 12px 16px; }
  .section { padding: 66px 0; }
  .about-media { margin-right: 12%; }
  .exp-badge { top: -18px; left: -10px; padding: 13px 16px; }
  .exp-badge b { font-size: 23px; }
  .about-media .img-sub { border-width: 4px; }
  .prod-grid { grid-template-columns: 1fr; }
  .cert-grid, .app-grid, .contact-grid { grid-template-columns: 1fr; }
  .patent-row { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .faq-q { font-size: 15px; padding: 17px 16px; gap: 12px; }
  .faq-a p { padding: 0 16px 18px 62px; }
  .cta-inner { justify-content: center; text-align: center; }
  .footer-top { grid-template-columns: 1fr; padding: 54px 0 36px; }
  .to-top { right: 16px; bottom: 20px; width: 44px; height: 44px; }
}

/* ---------- Page hero (subpages) ---------- */
.page-hero { position: relative; padding: 96px 0 64px; color: #fff; background: var(--navy); overflow: hidden; }
.page-hero::before { content: ""; position: absolute; inset: 0; background-size: cover; background-position: center; opacity: .45; }
.ph-about::before { background-image: url('../img/banner-floor.jpg'); }
.ph-products::before { background-image: url('../img/prod-floor.jpg'); }
.ph-strength::before { background-image: url('../img/banner-marine.jpg'); }
.ph-applications::before { background-image: url('../img/banner-polyurea.jpg'); }
.ph-faq::before { background-image: url('../img/about-lab.jpg'); }
.ph-contact::before { background-image: url('../img/banner-marine.jpg'); }
.page-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg, rgba(7,32,58,.92) 12%, rgba(9,48,86,.6) 60%, rgba(7,32,58,.35)); }
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(1.9rem, 3.6vw, 3rem); font-weight: 800; line-height: 1.25; max-width: 720px; }
.page-hero p { margin-top: 12px; color: rgba(255,255,255,.8); max-width: 640px; font-size: 16px; }
.crumb { margin-top: 22px; display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: rgba(255,255,255,.6); }
.crumb a { color: rgba(255,255,255,.75); }
.crumb a:hover { color: #fff; }
.crumb b { color: #8FD4FF; font-weight: 600; }

/* ---------- Mission / Vision ---------- */
.mv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.mv-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 36px 34px; position: relative; overflow: hidden; transition: all var(--trans); }
.mv-card::after { content: ""; position: absolute; right: -40px; top: -40px; width: 150px; height: 150px; border-radius: 50%; background: var(--cyan-light); opacity: .6; transition: all var(--trans); }
.mv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.mv-card:hover::after { transform: scale(1.6); opacity: .35; }
.mv-icon { position: relative; z-index: 1; width: 58px; height: 58px; border-radius: 15px; background: linear-gradient(135deg, var(--blue), var(--cyan)); color: #fff; display: grid; place-items: center; font-size: 27px; margin-bottom: 18px; box-shadow: 0 10px 24px rgba(12,119,187,.35); }
.mv-card h3 { position: relative; z-index: 1; font-size: 21px; font-weight: 800; margin-bottom: 10px; }
.mv-card p { position: relative; z-index: 1; color: var(--gray); font-size: 15px; }

/* ---------- Values ---------- */
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px 26px; transition: all var(--trans); }
.value-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(12,119,187,.4); }
.value-icon { width: 54px; height: 54px; border-radius: 14px; background: var(--cyan-light); color: var(--blue); display: grid; place-items: center; font-size: 26px; margin-bottom: 16px; transition: all var(--trans); }
.value-card:hover .value-icon { background: var(--blue); color: #fff; transform: rotate(-6deg) scale(1.06); }
.value-card h4 { font-size: 17px; font-weight: 700; }
.value-card p { font-size: 14px; color: var(--gray); margin-top: 8px; }

/* ---------- Steps ---------- */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step-card { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 34px 26px; transition: all var(--trans); overflow: hidden; }
.step-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.step-no { display: block; font-size: 44px; font-weight: 800; line-height: 1; background: linear-gradient(135deg, var(--cyan), var(--blue)); -webkit-background-clip: text; background-clip: text; color: transparent; opacity: .9; margin-bottom: 14px; font-variant-numeric: tabular-nums; }
.step-card h4 { font-size: 17.5px; font-weight: 700; }
.step-card p { font-size: 14px; color: var(--gray); margin-top: 8px; }

/* ---------- Cert note ---------- */
.cert-note { position: relative; margin-top: 30px; text-align: center; font-size: 14px; color: rgba(255,255,255,.55); }

/* ---------- Contact page ---------- */
.contact-page-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.contact-col { display: grid; gap: 24px; }
.contact-form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 38px 34px; box-shadow: var(--shadow-sm); }
.contact-form-card h3 { font-size: 22px; font-weight: 800; }
.contact-form-card > p { color: var(--gray); font-size: 14.5px; margin: 8px 0 24px; }
.contact-form-card input, .contact-form-card textarea {
  width: 100%; padding: 13px 16px; border: 1px solid var(--line); border-radius: 10px;
  font-family: inherit; font-size: 14.5px; color: var(--ink); background: var(--bg);
  transition: all var(--trans); margin-bottom: 14px; resize: vertical;
}
.contact-form-card input:focus, .contact-form-card textarea:focus { outline: none; border-color: var(--blue); background: #fff; box-shadow: 0 0 0 3px rgba(12,119,187,.12); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.contact-form-card .btn { width: 100%; justify-content: center; }
.form-note { margin-top: 14px; font-size: 13px; color: #8b9aa5; text-align: center; }

@media (max-width: 1080px) {
  .values-grid, .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-page-grid { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .page-hero { padding: 64px 0 48px; }
  .mv-grid, .values-grid, .steps-grid, .form-row { grid-template-columns: 1fr; }
}