/* =========================================================
   NAILEOS — AI Smart Hardware Manufacturer
   Style sheet (OEM/ODM B2B foreign-trade site)
   ========================================================= */

:root {
  --navy: #0a1f44;
  --navy-2: #0e2a5c;
  --blue: #2563eb;
  --blue-2: #3b82f6;
  --violet: #7c3aed;
  --cyan: #06b6d4;
  --ink: #0f172a;
  --slate: #475569;
  --muted: #94a3b8;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --bg-dark: #0a1f44;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(10, 31, 68, 0.08);
  --shadow-lg: 0 24px 60px rgba(10, 31, 68, 0.16);
  --maxw: 1180px;
  --font: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.section { padding: 84px 0; }
.section--soft { background: var(--bg-soft); }
.section--dark { background: var(--bg-dark); color: #fff; }

.eyebrow {
  display: inline-block;
  font-size: 13px; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--blue);
  background: rgba(37, 99, 235, 0.08);
  padding: 6px 14px; border-radius: 999px;
  margin-bottom: 16px;
}
.section--dark .eyebrow { color: #9ec1ff; background: rgba(158,193,255,.12); }

h1, h2, h3 { line-height: 1.18; font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 3.4vw, 42px); }
h3 { font-size: 20px; }

.lead { font-size: 18px; color: var(--slate); max-width: 720px; }
.section--dark .lead { color: #c7d6f0; }

.section-head { text-align: center; max-width: 760px; margin: 0 auto 52px; }
.section-head .lead { margin: 14px auto 0; }

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 15px;
  padding: 13px 26px; border-radius: 999px;
  border: 1.5px solid transparent; cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--blue); color: #fff; box-shadow: 0 10px 24px rgba(37,99,235,.35); }
.btn--primary:hover { background: #1d4fd0; }
.btn--ghost { border-color: rgba(255,255,255,.4); color: #fff; }
.btn--ghost:hover { background: rgba(255,255,255,.1); }
.btn--dark { background: var(--navy); color: #fff; }
.btn--dark:hover { background: #06183a; }
.btn--outline { border-color: var(--line); color: var(--ink); background: #fff; }
.btn--outline:hover { border-color: var(--blue); color: var(--blue); }

/* ---------------- Header ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10,31,68,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; font-size: 20px; letter-spacing: .02em; }
.brand .logo-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  display: grid; place-items: center; color: #fff; font-weight: 900; font-size: 15px;
  box-shadow: 0 6px 16px rgba(124,58,237,.4);
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: #cdd9ef; font-size: 15px; font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: #fff; }
.nav-cta { display: flex; align-items: center; gap: 14px; }
.nav-toggle { display: none; background: none; border: 0; color: #fff; font-size: 26px; cursor: pointer; }

/* ---------------- Hero ---------------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(124,58,237,.35), transparent 60%),
    radial-gradient(800px 500px at 10% 10%, rgba(37,99,235,.30), transparent 55%),
    linear-gradient(160deg, #061634, #0a1f44 55%, #0c2a5e);
  color: #fff;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 70% 30%, #000, transparent 75%);
  opacity: .5;
}
.hero-inner { position: relative; z-index: 2; padding: 96px 0 104px; display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(34px, 5vw, 56px); margin: 18px 0 18px; }
.hero .lead { color: #d3e0f7; }
.hero-cta { display: flex; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 30px; margin-top: 40px; flex-wrap: wrap; }
.hero-stats .stat { }
.hero-stats .num { font-size: 26px; font-weight: 800; color: #fff; }
.hero-stats .lbl { font-size: 13px; color: #9fb4d8; }

/* hero visual card */
.hero-card {
  background: linear-gradient(160deg, rgba(255,255,255,.10), rgba(255,255,255,.03));
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 22px; padding: 22px;
  box-shadow: var(--shadow-lg);
}
.hero-card .device {
  aspect-ratio: 4/3; border-radius: 16px;
  background:
    radial-gradient(400px 300px at 50% 30%, rgba(124,58,237,.5), transparent 70%),
    linear-gradient(160deg, #102a57, #0a1f44);
  display: grid; place-items: center; position: relative; overflow: hidden;
}
/* hero product carousel (replaces the spinning ring) */
.hero-card .device .carousel { position: absolute; inset: 0; }
.hero-card .device .slide {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: 0; transform: scale(1.04);
  transition: opacity .8s ease, transform 6s ease;
}
.hero-card .device .slide.active { opacity: 1; transform: scale(1); }
.hero-card .device .car-dots {
  position: absolute; bottom: 12px; left: 0; right: 0; z-index: 3;
  display: flex; justify-content: center; gap: 8px;
}
.hero-card .device .car-dots button {
  width: 9px; height: 9px; padding: 0; border: none; border-radius: 50%;
  background: rgba(255,255,255,.5); cursor: pointer; transition: width .25s, background .25s;
}
.hero-card .device .car-dots button.active { width: 22px; border-radius: 5px; background: #fff; }
.hero-card .device .car-prev, .hero-card .device .car-next {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 3;
  width: 34px; height: 34px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(10,31,68,.45); color: #fff; font-size: 22px; line-height: 1;
  display: grid; place-items: center;
}
.hero-card .device .car-prev { left: 10px; }
.hero-card .device .car-next { right: 10px; }
.hero-card .device .car-prev:hover, .hero-card .device .car-next:hover { background: rgba(10,31,68,.7); }
.hero-card .cap { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; }
.hero-card .chip { font-size: 13px; font-weight: 700; color: #fff; border: none;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  padding: 8px 15px; border-radius: 999px; letter-spacing: .3px;
  box-shadow: 0 6px 18px rgba(37,99,235,.38); }

/* ---------------- Trust bar ---------------- */
.trustbar { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.trustbar .container { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 22px 24px; flex-wrap: wrap; }
.trustbar .item { display: flex; align-items: center; gap: 10px; color: var(--slate); font-weight: 600; font-size: 14px; }
.trustbar .badge {
  width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  background: var(--bg-soft); color: var(--blue); font-weight: 800; font-size: 13px;
  border: 1px solid var(--line);
}

/* ---------------- Product cards ---------------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.prod-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow); transition: transform .2s, box-shadow .25s;
  display: flex; flex-direction: column;
}
.prod-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.prod-card .thumb {
  aspect-ratio: 16/11; position: relative;
  background: linear-gradient(160deg, #eef3fb, #e3ebfa);
  display: grid; place-items: center;
  border-bottom: 1px solid var(--line);
}
.prod-card .thumb .ph { color: var(--slate); font-size: 13px; text-align: center; padding: 0 16px; }
.prod-card .thumb .ph strong { display:block; color: var(--navy); font-size: 14px; margin-bottom: 4px; }
/* drop-in product image: put file in assets/img/ with the name below; shows when present, placeholder when missing */
.prod-card .thumb img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity .3s; }
.prod-card .body { padding: 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.prod-card h3 { font-size: 19px; }
.prod-card p { color: var(--slate); font-size: 14.5px; flex: 1; }
.prod-card .tags { display: flex; gap: 8px; flex-wrap: wrap; }
.prod-card .tag { font-size: 12px; background: var(--bg-soft); color: var(--blue); padding: 4px 10px; border-radius: 999px; font-weight: 600; }
.prod-card .more { font-weight: 700; color: var(--blue); font-size: 14px; margin-top: 6px; }

/* ---------------- Featured product ---------------- */
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.feature .visual {
  aspect-ratio: 1/1; border-radius: 20px;
  background: radial-gradient(500px 400px at 50% 35%, rgba(37,99,235,.18), transparent 70%), linear-gradient(160deg,#f3f7ff,#e9eefb);
  border: 1px solid var(--line); display: grid; place-items: center; position: relative;
}
.feature .visual .ph { color: var(--slate); text-align: center; font-size: 13px; padding: 0 24px; }
.feature .visual img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity .3s; }
.spec-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 22px; }
.spec { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px 16px; }
.spec .k { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }
.spec .v { font-size: 15px; font-weight: 700; color: var(--ink); margin-top: 3px; }

.ai-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 24px; }
.ai-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 14.5px; color: var(--slate); }
.ai-list .ic { flex: none; width: 30px; height: 30px; border-radius: 8px; background: rgba(37,99,235,.1); color: var(--blue); display: grid; place-items: center; font-weight: 800; }

/* ---------------- Capability icons ---------------- */
.cap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cap {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: border-color .2s, transform .2s;
}
.cap:hover { border-color: var(--blue); transform: translateY(-4px); }
.cap .ic { width: 50px; height: 50px; border-radius: 13px; background: linear-gradient(135deg, var(--blue), var(--violet)); color: #fff; display: grid; place-items: center; font-size: 22px; margin-bottom: 16px; }
.cap h3 { font-size: 18px; margin-bottom: 8px; }
.cap p { color: var(--slate); font-size: 14.5px; }

/* ---------------- Process ---------------- */
.process { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; margin-top: 18px; }
.step { background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.12); border-radius: 12px; padding: 18px 14px; text-align: center; }
.step .n { font-size: 13px; color: #9ec1ff; font-weight: 800; }
.step .t { font-size: 14px; font-weight: 700; margin-top: 6px; color: #fff; }

/* ---------------- OEM/ODM terms ---------------- */
.terms { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 10px; }
.term { text-align: center; padding: 26px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.term .big { font-size: 34px; font-weight: 900; color: var(--blue); letter-spacing: -.02em; }
.term .lbl { font-size: 14px; color: var(--slate); margin-top: 6px; font-weight: 600; }

/* ---------------- About ---------------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-list { list-style: none; display: grid; gap: 14px; margin-top: 20px; }
.about-list li { display: flex; gap: 12px; font-size: 15px; color: var(--slate); }
.about-list .ic { color: var(--blue); font-weight: 900; }

/* ---------------- News ---------------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; display: flex; flex-direction: column; }
.news-card .cover { aspect-ratio: 16/9; background: linear-gradient(160deg, var(--navy), var(--blue)); display: grid; place-items: center; color: #fff; font-weight: 800; }
.news-card .body { padding: 20px; }
.news-card .date { font-size: 12px; color: var(--muted); font-weight: 700; text-transform: uppercase; letter-spacing: .06em; }
.news-card h3 { font-size: 17px; margin: 8px 0; }
.news-card p { font-size: 14px; color: var(--slate); }

/* ---------------- Contact ---------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; }
.form { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 700; color: var(--slate); margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 15px; color: var(--ink); background: #fff;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.field textarea { min-height: 110px; resize: vertical; }
.form-note { font-size: 12.5px; color: var(--muted); margin-top: 8px; }
.form-status { font-size: 13.5px; font-weight: 600; margin-top: 12px; min-height: 1em; }
.form-status.ok { color: #15a36e; }
.form-status.err { color: #d6453d; }
.contact-info .info-item { display: flex; gap: 14px; margin-bottom: 22px; }
.contact-info .ic { flex: none; width: 44px; height: 44px; border-radius: 12px; background: rgba(37,99,235,.1); color: var(--blue); display: grid; place-items: center; font-size: 18px; }
.contact-info h4 { font-size: 14px; color: var(--slate); font-weight: 700; }
.contact-info p { font-size: 16px; color: var(--ink); font-weight: 600; }

/* ---------------- Footer ---------------- */
.site-footer { background: var(--bg-dark); color: #c7d6f0; padding: 56px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; }
.site-footer .brand { color: #fff; margin-bottom: 14px; }
.site-footer p { font-size: 14px; color: #9fb4d8; max-width: 320px; }
.footer-col h4 { color: #fff; font-size: 14px; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 14px; }
.footer-col a { display: block; color: #9fb4d8; font-size: 14px; margin-bottom: 9px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 36px; padding-top: 20px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: #7e96c0; }

/* ---------------- Placeholder note banner ---------------- */
.placeholder-note {
  background: #fff7ed; border: 1px dashed #f59e0b; color: #92400e;
  font-size: 13px; padding: 10px 16px; border-radius: 10px; margin-top: 14px;
}

/* ---------------- Responsive ---------------- */
@media (max-width: 980px) {
  .hero-inner, .feature, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .grid-3, .cap-grid, .news-grid { grid-template-columns: 1fr 1fr; }
  .terms { grid-template-columns: 1fr 1fr; }
  .process { grid-template-columns: 1fr 1fr; }
  .spec-grid, .ai-list { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open { display: flex; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; background: var(--navy); padding: 18px 24px; gap: 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .grid-3, .cap-grid, .news-grid, .terms { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
  .hero-inner { padding: 64px 0 72px; }
}

/* language toggle */
.lang-toggle {
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.28);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .2s, border-color .2s;
}
.lang-toggle:hover { background: rgba(255,255,255,.20); }
@media (max-width: 620px) {
  .nav-cta .lang-toggle { padding: 7px 11px; font-size: 12px; }
}