/* ============================================
   CH Tech Solutions — styles.css
   Dark navy + cyan/teal brand palette
   ============================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:    #0A1628;
  --navy-light: #0F2140;
  --navy-mid: #132A4A;
  --cyan:    #00D9FF;
  --teal:    #14B8A6;
  --white:   #F0F4F8;
  --gray:    #94A3B8;
  --gray-dark: #475569;
  --gradient-cta: linear-gradient(135deg, var(--cyan), var(--teal));
  --gradient-bg:  linear-gradient(180deg, var(--navy) 0%, var(--navy-light) 100%);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,.35);
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--navy);
  color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--teal); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- Utility ---------- */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.text-gradient { background: var(--gradient-cta); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* ---------- Animations ---------- */
.reveal { opacity: 0; transform: translateY(32px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-left  { opacity: 0; transform: translateX(-40px); transition: opacity .7s ease, transform .7s ease; }
.reveal-right { opacity: 0; transform: translateX(40px);  transition: opacity .7s ease, transform .7s ease; }
.reveal-left.visible, .reveal-right.visible { opacity: 1; transform: translateX(0); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px; font-weight: 600; font-size: .95rem;
  cursor: pointer; border: none; transition: all var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient-cta); color: var(--navy);
  box-shadow: 0 0 24px rgba(0,217,255,.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(0,217,255,.45);
  color: var(--navy);
}
.btn-outline {
  background: transparent; color: var(--cyan);
  border: 2px solid rgba(0,217,255,.4);
}
.btn-outline:hover {
  background: rgba(0,217,255,.1); border-color: var(--cyan);
  color: var(--cyan);
}
.btn-sm { padding: 10px 24px; font-size: .875rem; }

/* ---------- Navigation ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 16px 0; transition: all var(--transition);
}
.nav.scrolled {
  background: rgba(10,22,40,.92); backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0,217,255,.1);
  padding: 12px 0;
}
.nav .container { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-size: 1.25rem; font-weight: 800; letter-spacing: -.5px; color: var(--white); }
.nav-logo span { color: var(--cyan); }
.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a { color: var(--gray); font-size: .9rem; font-weight: 500; }
.nav-links a:hover { color: var(--white); }
.nav-cta { padding: 10px 24px; font-size: .85rem; }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--white); border-radius: 2px; transition: all var(--transition); }

/* Mobile nav */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
    background: var(--navy-light); flex-direction: column; align-items: flex-start;
    padding: 80px 32px 32px; gap: 24px;
    transition: right var(--transition);
    border-left: 1px solid rgba(0,217,255,.1);
  }
  .nav-links.open { right: 0; }
  .nav-links a { font-size: 1.1rem; }
  .mobile-overlay {
    display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 998;
  }
  .mobile-overlay.open { display: block; }
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  padding: 120px 0 80px;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0,217,255,.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(20,184,166,.06) 0%, transparent 50%),
    var(--navy);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 800px; height: 800px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,217,255,.04) 0%, transparent 70%);
  animation: float 20s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-40px, 30px); }
}

.hero-content { max-width: 720px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: 50px; font-size: .8rem; font-weight: 600;
  background: rgba(0,217,255,.1); border: 1px solid rgba(0,217,255,.2);
  color: var(--cyan); margin-bottom: 24px; letter-spacing: .5px; text-transform: uppercase;
}
.hero-badge::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); animation: pulse-dot 2s infinite; }
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem); font-weight: 800;
  line-height: 1.1; margin-bottom: 20px; letter-spacing: -1px;
}
.hero p.subtitle {
  font-size: 1.15rem; color: var(--gray); max-width: 560px; margin-bottom: 36px; line-height: 1.7;
}
.hero-ctas { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }

/* Stats bar */
.stats-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: rgba(0,217,255,.08); border-radius: var(--radius); overflow: hidden;
  border: 1px solid rgba(0,217,255,.1);
}
.stat {
  padding: 20px 16px; text-align: center;
  background: rgba(10,22,40,.6);
}
.stat-value { font-size: 1.5rem; font-weight: 800; color: var(--cyan); }
.stat-label { font-size: .78rem; color: var(--gray); margin-top: 4px; text-transform: uppercase; letter-spacing: .5px; }

@media (max-width: 600px) {
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Section shared ---------- */
section { padding: 100px 0; }
.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1.5px; color: var(--cyan); margin-bottom: 16px;
}
.section-label::before { content: ''; width: 24px; height: 2px; background: var(--gradient-cta); }
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem); font-weight: 800;
  line-height: 1.2; margin-bottom: 16px; letter-spacing: -.5px;
}
.section-subtitle { color: var(--gray); font-size: 1.05rem; max-width: 600px; line-height: 1.7; }
.section-header { margin-bottom: 56px; }
.section-header.center { text-align: center; }
.section-header.center .section-subtitle { margin: 0 auto; }

/* Alternating bg */
.bg-darker { background: var(--navy-light); }
.bg-gradient {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(0,217,255,.06) 0%, transparent 60%),
    var(--navy);
}

/* ---------- Services ---------- */
.services-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}
.service-card {
  background: rgba(15,33,64,.6); border: 1px solid rgba(0,217,255,.08);
  border-radius: var(--radius); padding: 36px 28px;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-cta); transform: scaleX(0); transform-origin: left;
  transition: transform var(--transition);
}
.service-card:hover { border-color: rgba(0,217,255,.2); transform: translateY(-4px); box-shadow: var(--shadow); }
.service-card:hover::before { transform: scaleX(1); }

.service-icon {
  width: 56px; height: 56px; border-radius: var(--radius-sm);
  background: rgba(0,217,255,.1); display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; margin-bottom: 20px;
}
.service-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.service-card p { color: var(--gray); font-size: .92rem; line-height: 1.7; margin-bottom: 20px; }
.service-card .btn-sm { padding: 8px 20px; font-size: .82rem; }

@media (max-width: 420px) {
  .services-grid { grid-template-columns: 1fr; }
}

/* ---------- How It Works ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; position: relative; }
.steps::before {
  content: ''; position: absolute; top: 48px; left: 15%; right: 15%;
  height: 2px; background: linear-gradient(90deg, transparent, rgba(0,217,255,.3), transparent);
}
.step { text-align: center; position: relative; }
.step-number {
  width: 72px; height: 72px; border-radius: 50%;
  background: var(--gradient-cta); color: var(--navy);
  font-size: 1.5rem; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 24px; position: relative; z-index: 1;
  box-shadow: 0 0 32px rgba(0,217,255,.25);
}
.step h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.step p { color: var(--gray); font-size: .9rem; max-width: 280px; margin: 0 auto; line-height: 1.6; }

@media (max-width: 768px) {
  .steps { grid-template-columns: 1fr; gap: 48px; }
  .steps::before { display: none; }
}

/* ---------- AI Simulation ---------- */
.sim-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.sim-panel {
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid rgba(0,217,255,.1);
}
.sim-header {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 20px; font-size: .85rem; font-weight: 600;
}
.sim-header .dots { display: flex; gap: 6px; }
.sim-header .dots span { width: 10px; height: 10px; border-radius: 50%; }
.sim-bad .sim-header { background: rgba(239,68,68,.15); color: #f87171; }
.sim-bad .sim-header .dots span { background: #f87171; }
.sim-bad { border-color: rgba(239,68,68,.15); }
.sim-good .sim-header { background: rgba(20,184,166,.15); color: var(--teal); }
.sim-good .sim-header .dots span { background: var(--teal); }

.sim-body { padding: 24px; background: rgba(10,22,40,.8); }
.sim-prompt {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 16px; background: rgba(0,217,255,.05);
  border-radius: var(--radius-sm); margin-bottom: 16px;
  font-size: .88rem; color: var(--gray);
}
.sim-prompt .icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 2px; }
.sim-response { font-size: .88rem; line-height: 1.7; }
.sim-response p { margin-bottom: 12px; }
.sim-response .highlight { color: var(--teal); font-weight: 600; }
.sim-response .negative { color: #f87171; }

.sim-response ul { list-style: none; padding: 0; }
.sim-response ul li { padding: 6px 0; padding-left: 20px; position: relative; }
.sim-response ul li::before { content: '✓'; position: absolute; left: 0; color: var(--teal); font-weight: 700; }
.sim-bad .sim-response ul li::before { content: '✗'; color: #f87171; }

@media (max-width: 768px) {
  .sim-wrapper { grid-template-columns: 1fr; }
}

/* ---------- Case Studies ---------- */
.cases-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.case-card {
  background: rgba(15,33,64,.5); border: 1px solid rgba(0,217,255,.1);
  border-radius: var(--radius); padding: 40px 32px;
  transition: all var(--transition);
}
.case-card:hover { border-color: rgba(0,217,255,.25); transform: translateY(-2px); }
.case-tag {
  display: inline-block; padding: 4px 12px; border-radius: 50px;
  font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px;
  margin-bottom: 16px;
}
.case-tag.discovery { background: rgba(0,217,255,.15); color: var(--cyan); }
.case-tag.content { background: rgba(20,184,166,.15); color: var(--teal); }
.case-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
.case-card .case-desc { color: var(--gray); font-size: .92rem; margin-bottom: 20px; line-height: 1.7; }
.case-metrics { display: flex; gap: 24px; flex-wrap: wrap; }
.case-metric { text-align: center; }
.case-metric .val { font-size: 1.4rem; font-weight: 800; color: var(--cyan); }
.case-metric .lbl { font-size: .75rem; color: var(--gray); text-transform: uppercase; letter-spacing: .5px; }

@media (max-width: 600px) {
  .cases-grid { grid-template-columns: 1fr; }
}

/* ---------- About ---------- */
.about-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; align-items: center; }
.about-image {
  aspect-ratio: 1; border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(0,217,255,.15), rgba(20,184,166,.1)),
    var(--navy-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem; border: 1px solid rgba(0,217,255,.1);
  position: relative; overflow: hidden;
}
.about-image::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(0,217,255,.08));
}
.about-content h3 { font-size: 1.6rem; font-weight: 800; margin-bottom: 16px; }
.about-content p { color: var(--gray); font-size: .95rem; line-height: 1.8; margin-bottom: 16px; }
.about-badges {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; margin-bottom: 28px;
}
.badge {
  padding: 6px 14px; border-radius: 50px; font-size: .78rem; font-weight: 600;
  background: rgba(0,217,255,.08); border: 1px solid rgba(0,217,255,.12);
  color: var(--cyan);
}

@media (max-width: 768px) {
  .about-layout { grid-template-columns: 1fr; }
  .about-image { max-width: 300px; margin: 0 auto; }
}

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid rgba(0,217,255,.08);
}
.faq-question {
  width: 100%; background: none; border: none; color: var(--white);
  font-family: var(--font); font-size: 1.02rem; font-weight: 600;
  text-align: left; padding: 22px 40px 22px 0; cursor: pointer;
  position: relative; transition: color var(--transition);
}
.faq-question:hover { color: var(--cyan); }
.faq-question::after {
  content: '+'; position: absolute; right: 0; top: 50%; transform: translateY(-50%);
  font-size: 1.4rem; font-weight: 300; color: var(--cyan);
  transition: transform var(--transition);
}
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height .4s ease, padding .4s ease;
}
.faq-item.open .faq-answer { max-height: 400px; }
.faq-answer-inner {
  padding: 0 0 22px; color: var(--gray); font-size: .92rem; line-height: 1.8;
}

/* ---------- Booking ---------- */
.booking-section {
  background:
    radial-gradient(ellipse at 50% 100%, rgba(0,217,255,.1) 0%, transparent 60%),
    var(--navy-light);
}
.booking-wrapper {
  text-align: center;
}
.booking-wrapper iframe {
  width: 100%; max-width: 700px; height: 700px;
  border: 1px solid rgba(0,217,255,.1); border-radius: var(--radius);
  background: var(--navy);
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  padding: 80px 0; text-align: center;
  background: var(--gradient-cta);
}
.cta-banner h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800; color: var(--navy); margin-bottom: 12px; }
.cta-banner p { color: rgba(10,22,40,.7); font-size: 1.05rem; margin-bottom: 28px; }
.cta-banner .btn {
  background: var(--navy); color: var(--white);
  box-shadow: 0 4px 20px rgba(0,0,0,.3);
}
.cta-banner .btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,.4); color: var(--white); }

/* ---------- Footer ---------- */
.footer {
  padding: 60px 0 32px;
  border-top: 1px solid rgba(0,217,255,.08);
  background: var(--navy);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { color: var(--gray); font-size: .88rem; line-height: 1.7; margin-top: 12px; max-width: 300px; }
.footer h4 { font-size: .85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; color: var(--white); }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { color: var(--gray); font-size: .88rem; }
.footer ul a:hover { color: var(--cyan); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 24px; border-top: 1px solid rgba(0,217,255,.06);
  font-size: .82rem; color: var(--gray-dark);
}
.footer-socials { display: flex; gap: 16px; }
.footer-socials a {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(0,217,255,.08); display: flex; align-items: center; justify-content: center;
  color: var(--gray); font-size: .9rem; transition: all var(--transition);
}
.footer-socials a:hover { background: var(--cyan); color: var(--navy); }

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--navy); }
::-webkit-scrollbar-thumb { background: var(--navy-mid); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,217,255,.3); }