/* ===== CIOT — Intelligent Service Robots ===== */

:root {
  --bg: #050b16;
  --bg-soft: #0a1220;
  --bg-card: #0d1626;
  --border: rgba(56, 152, 255, 0.14);
  --accent: #1e9bf0;
  --accent-bright: #38bdf8;
  --text: #e8eef7;
  --muted: #93a4ba;
  --muted-2: #6b7c94;
  --radius: 14px;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Space Grotesk", "Inter", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: min(1160px, 92%);
  margin: 0 auto;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 11, 22, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  background: rgba(5, 11, 22, 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand { display: flex; align-items: baseline; gap: 10px; text-decoration: none; }

.brand-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: 0.14em;
  color: #fff;
  border-bottom: 2px solid #fff;
  padding-bottom: 1px;
}

.brand-sub {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.04em;
  border-left: 1px solid var(--muted-2);
  padding-left: 10px;
}

.main-nav { display: flex; align-items: center; gap: 34px; }

.main-nav > a:not(.nav-cta) {
  color: var(--text);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
  opacity: 0.85;
  transition: opacity 0.2s, color 0.2s;
}
.main-nav > a:not(.nav-cta):hover { opacity: 1; color: var(--accent-bright); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.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); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.35), 0 8px 28px rgba(30, 155, 240, 0.28);
}
.btn-primary:hover {
  background: #2aa9ff;
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.5), 0 10px 34px rgba(30, 155, 240, 0.42);
}
.btn-primary .arrow { transition: transform 0.2s; }
.btn-primary:hover .arrow { transform: translateX(4px); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: rgba(56, 152, 255, 0.45); background: rgba(56, 152, 255, 0.08); }

.btn-sm { padding: 9px 20px; font-size: 14px; border-radius: 8px; }

/* ===== Eyebrow / headings ===== */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--accent-bright);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.eyebrow-line { width: 28px; height: 2px; background: var(--accent); border-radius: 2px; }

h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 5.4vw, 62px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin-bottom: 22px;
}
h1 em { font-style: normal; color: var(--accent-bright); }

h2 {
  font-family: var(--font-display);
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 14px;
}

.section-lead {
  color: var(--muted);
  font-size: 17px;
  max-width: 640px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg { position: absolute; inset: 0; }
.hero-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center right;
  opacity: 0.55;
}
.hero-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(90deg, var(--bg) 8%, rgba(5, 11, 22, 0.82) 38%, rgba(5, 11, 22, 0.25) 70%, rgba(5, 11, 22, 0.55) 100%),
    linear-gradient(0deg, var(--bg) 0%, rgba(5, 11, 22, 0) 30%);
}

.hero-inner { position: relative; z-index: 2; padding: 120px 0 140px; }
.hero-content { max-width: 640px; }

.hero-lead {
  color: var(--muted);
  font-size: 17.5px;
  max-width: 560px;
  margin-bottom: 34px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ===== Stats ===== */
.stats {
  background: linear-gradient(180deg, #0c1830 0%, #0a1424 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 56px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(30px, 3.4vw, 44px);
  font-weight: 700;
  color: var(--accent-bright);
}
.stat-label { color: var(--muted); font-size: 14.5px; margin-top: 6px; }

/* ===== Sections ===== */
.section { padding: 110px 0; }

/* ===== Solutions ===== */
.solutions-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.solution-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.solution-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 152, 255, 0.4);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(56, 152, 255, 0.08);
}

.card-media { aspect-ratio: 16 / 9.4; overflow: hidden; }
.card-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(0.92) brightness(0.9);
  transition: transform 0.4s ease;
}
.solution-card:hover .card-media img { transform: scale(1.04); }

.card-body { padding: 24px 26px 28px; }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.tag-row span {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-bright);
  background: rgba(30, 155, 240, 0.12);
  border: 1px solid rgba(56, 152, 255, 0.3);
  padding: 4px 12px;
  border-radius: 999px;
}

.solution-card h3 {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  margin-bottom: 10px;
}
.solution-card p { color: var(--muted); font-size: 14.5px; }

/* ===== Industries ===== */
.industries {
  background: linear-gradient(180deg, var(--bg) 0%, #08101f 100%);
  border-bottom: 1px solid var(--border);
}
.chip-cloud {
  margin-top: 44px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  max-width: 900px;
}
.chip {
  padding: 12px 24px;
  border-radius: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 14.5px;
  font-weight: 500;
  cursor: default;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.chip:hover { border-color: rgba(56, 152, 255, 0.45); color: var(--accent-bright); }
.chip-active {
  background: rgba(30, 155, 240, 0.16);
  border-color: rgba(56, 152, 255, 0.55);
  color: #fff;
}

/* ===== Innovation ===== */
.innovation-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 64px;
  align-items: center;
}
.innovation-intro .section-lead { margin-top: 6px; }

.innovation-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color 0.25s, transform 0.25s;
}
.info-card:hover { border-color: rgba(56, 152, 255, 0.4); transform: translateY(-3px); }

.info-value {
  display: block;
  font-family: var(--font-display);
  font-size: 27px;
  font-weight: 700;
  color: var(--accent-bright);
  margin-bottom: 8px;
}
.info-title { display: block; font-weight: 600; font-size: 14.5px; margin-bottom: 10px; }
.info-card p { color: var(--muted); font-size: 13.5px; }

/* ===== CTA ===== */
.cta {
  background: linear-gradient(90deg, #0a1830 0%, #0d1526 100%);
  border-top: 1px solid var(--border);
  padding: 100px 0;
}
.cta-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 60px;
  align-items: center;
}
.cta-content .section-lead { margin-bottom: 32px; }
.cta-media img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  aspect-ratio: 16 / 10;
  object-fit: cover;
  width: 100%;
}

/* ===== Footer ===== */
.site-footer {
  background: #060d1a;
  border-top: 1px solid var(--border);
  padding: 72px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 56px;
}
.footer-brand p { color: var(--muted); font-size: 14.5px; margin: 20px 0 22px; max-width: 320px; }
.footer-mail {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--accent-bright);
  font-size: 14px;
  text-decoration: none;
}
.footer-mail:hover { text-decoration: underline; }
.mail-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.9);
}

.footer-col h4 {
  color: var(--accent-bright);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.footer-col a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: 14.5px;
  padding: 6px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--text); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding: 22px 0 26px;
  color: var(--muted-2);
  font-size: 13.5px;
}
.footer-badge { display: inline-flex; align-items: center; gap: 8px; }

/* ===== Reveal on scroll ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .solutions-grid { grid-template-columns: 1fr; }
  .innovation-grid { grid-template-columns: 1fr; gap: 40px; }
  .cta-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  .main-nav {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 24px 6vw 32px;
    background: rgba(6, 13, 26, 0.98);
    border-bottom: 1px solid var(--border);
    transform: translateY(-130%);
    transition: transform 0.3s ease;
    z-index: 99;
  }
  .main-nav.open { transform: none; }
  .main-nav > a:not(.nav-cta) { font-size: 17px; padding: 10px 0; }
  .nav-cta { margin-top: 12px; }
  .nav-toggle { display: flex; }
}

@media (max-width: 560px) {
  .section { padding: 80px 0; }
  .hero-inner { padding: 90px 0 110px; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .innovation-cards { grid-template-columns: 1fr; }
  .brand-sub { display: none; }
}