/*
  HelioNova Systems static site design system.
  Plain CSS only; shared by all pages in html-2.
*/

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

:root {
  --bg: #050913;
  --bg-2: #08111f;
  --bg-3: #0d1a2d;
  --surface: rgba(11, 25, 43, 0.78);
  --surface-strong: rgba(15, 34, 58, 0.92);
  --solar: #ffb703;
  --solar-2: #ff7a1a;
  --cyan: #20d6ff;
  --green: #57e389;
  --text: #edf7ff;
  --muted: #91a6bd;
  --border: rgba(255, 255, 255, 0.09);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --transition: 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
  --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
}

html { scroll-behavior: smooth; }
body {
  background:
    radial-gradient(circle at 18% 8%, rgba(255, 183, 3, 0.13), transparent 30rem),
    radial-gradient(circle at 86% 18%, rgba(32, 214, 255, 0.12), transparent 28rem),
    linear-gradient(180deg, var(--bg), #02050b 68%);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--solar); }
img { display: block; max-width: 100%; }
::selection { background: rgba(255, 183, 3, 0.32); }

nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  min-height: 68px; padding: 0 2rem;
  background: rgba(5, 9, 19, 0.68); backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border); transition: background var(--transition), border-color var(--transition);
}
nav.scrolled { background: rgba(5, 9, 19, 0.94); border-color: rgba(255, 183, 3, 0.18); }
.nav-logo { color: var(--text); font-weight: 800; font-size: 1.3rem; letter-spacing: -0.03em; }
.nav-logo span { color: var(--solar); }
.nav-links { display: flex; align-items: center; gap: 1.35rem; list-style: none; }
.nav-links a { color: var(--muted); font-size: 0.9rem; font-weight: 650; position: relative; }
.nav-links a::after { content: ''; position: absolute; left: 0; right: 0; bottom: -0.42rem; height: 2px; transform: scaleX(0); transform-origin: left; background: linear-gradient(90deg, var(--solar), var(--cyan)); transition: transform var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
.nav-cta { color: #07101d !important; background: linear-gradient(135deg, var(--solar), var(--solar-2)); padding: 0.55rem 1rem; border-radius: 999px; box-shadow: 0 0 26px rgba(255, 183, 3, 0.22); }
.nav-cta::after { display: none; }
.nav-burger { display: none; flex-direction: column; gap: 5px; border: 0; background: transparent; cursor: pointer; padding: 0.4rem; }
.nav-burger span { width: 24px; height: 2px; background: var(--text); border-radius: 999px; }

section { padding: 6.2rem 2rem; position: relative; }
section.alt { background: rgba(8, 17, 31, 0.62); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.center-wrap, .grid-2, .grid-3, .grid-4, .stats-grid, .footer-grid, .contact-grid { width: min(1120px, 100%); margin: 0 auto; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.35rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.2rem; }

.hero { min-height: 100vh; display: grid; align-items: center; padding: 7rem 2rem 4rem; overflow: hidden; }
#particles-canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.85; }
.hero-inner { position: relative; z-index: 1; width: min(1120px, 100%); margin: 0 auto; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 3rem; align-items: center; }
.hero-badge, .section-label, .tag, .blog-tag { display: inline-flex; align-items: center; gap: 0.45rem; width: fit-content; font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.75rem; color: var(--solar); border: 1px solid rgba(255, 183, 3, 0.24); background: rgba(255, 183, 3, 0.08); border-radius: 999px; padding: 0.42rem 0.78rem; }
.hero h1, .page-hero h1 { font-size: clamp(2.55rem, 6vw, 5rem); line-height: 1.02; letter-spacing: -0.06em; margin: 1.2rem 0 1.2rem; }
.hero h1 .accent, .page-hero h1 .accent { background: linear-gradient(135deg, var(--solar), var(--cyan)); -webkit-background-clip: text; color: transparent; }
.hero-sub, .page-hero p, .section-header p, .card p, .muted { color: var(--muted); }
.hero-sub { font-size: 1.14rem; max-width: 620px; }
.typed-wrap { margin: 1.4rem 0 2rem; font-family: var(--mono); color: var(--cyan); min-height: 1.5em; }
.cursor { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; }
.hero-visual { border: 1px solid var(--border); border-radius: 28px; background: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02)); box-shadow: var(--shadow); overflow: hidden; transform: perspective(900px) rotateY(-5deg); }
.hero-visual img { width: 100%; aspect-ratio: 1.08; object-fit: cover; }

.page-hero { padding: 9rem 2rem 4.5rem; text-align: center; background: radial-gradient(circle at 50% 0%, rgba(255,183,3,0.16), transparent 32rem); }
.page-hero p { max-width: 680px; margin: 0 auto; font-size: 1.08rem; }
.breadcrumb { display: flex; justify-content: center; gap: 0.55rem; margin-top: 1.4rem; color: var(--muted); font-size: 0.9rem; }

.section-header { text-align: center; max-width: 720px; margin: 0 auto 3.5rem; }
.section-header h2, .split-copy h2 { font-size: clamp(1.85rem, 4vw, 3rem); line-height: 1.1; letter-spacing: -0.04em; margin: 0.9rem 0 0.9rem; }
.card, .project-card, .pricing-card, .insight-card, .contact-form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.45rem; box-shadow: 0 14px 50px rgba(0,0,0,0.18); transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition); }
.card:hover, .project-card:hover, .pricing-card:hover, .insight-card:hover { transform: translateY(-6px); border-color: rgba(255,183,3,0.26); box-shadow: 0 22px 70px rgba(255,183,3,0.08); }
.card h3, .project-card h3, .insight-card h3 { margin: 0.7rem 0 0.45rem; line-height: 1.22; }
.icon { width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; font-size: 1.65rem; background: linear-gradient(135deg, rgba(255,183,3,0.18), rgba(32,214,255,0.12)); border: 1px solid rgba(255,255,255,0.1); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; border-radius: 999px; padding: 0.78rem 1.35rem; border: 1px solid transparent; font-weight: 750; cursor: pointer; transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition); }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #06111d; background: linear-gradient(135deg, var(--solar), var(--solar-2)); box-shadow: 0 14px 32px rgba(255, 183, 3, 0.23); }
.btn-outline { color: var(--text); border-color: var(--border); background: rgba(255,255,255,0.03); }
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.stat-box { text-align: center; padding: 1.3rem; border: 1px solid var(--border); border-radius: var(--radius); background: rgba(255,255,255,0.035); }
.stat-number { font-size: 2.2rem; font-weight: 850; color: var(--solar); letter-spacing: -0.04em; }
.stat-label { color: var(--muted); font-size: 0.86rem; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-top: 1rem; }
.tag { color: var(--cyan); border-color: rgba(32,214,255,0.22); background: rgba(32,214,255,0.08); letter-spacing: 0.06em; text-transform: none; }
.tag.solar { color: var(--solar); border-color: rgba(255,183,3,0.22); background: rgba(255,183,3,0.08); }
.tag.green { color: var(--green); border-color: rgba(87,227,137,0.22); background: rgba(87,227,137,0.08); }
.feature-image { overflow: hidden; padding: 0; }
.feature-image img { width: 100%; height: 100%; min-height: 310px; object-fit: cover; }
.process-list { display: grid; gap: 1rem; width: min(850px, 100%); margin: 0 auto; }
.process-item { display: grid; grid-template-columns: 90px 1fr; gap: 1rem; align-items: start; }
.process-num { color: #06111d; background: linear-gradient(135deg, var(--solar), var(--cyan)); border-radius: 999px; width: 64px; height: 64px; display: grid; place-items: center; font-weight: 850; }
.filter-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.7rem; margin-bottom: 2rem; }
.filter-btn { border: 1px solid var(--border); background: rgba(255,255,255,0.035); color: var(--muted); border-radius: 999px; padding: 0.55rem 1rem; cursor: pointer; font-weight: 700; }
.filter-btn.active, .filter-btn:hover { color: #06111d; background: linear-gradient(135deg, var(--solar), var(--solar-2)); border-color: transparent; }
.project-thumb { border-radius: 14px; overflow: hidden; margin-bottom: 1rem; border: 1px solid var(--border); background: var(--bg-3); }
.project-thumb img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); background: rgba(255,255,255,0.03); overflow: hidden; }
.faq-question { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.2rem; color: var(--text); background: transparent; border: 0; cursor: pointer; font-weight: 800; text-align: left; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height var(--transition); }
.faq-answer p { color: var(--muted); padding: 0 1.2rem 1.1rem; }
.faq-item.open .faq-answer { max-height: 220px; }
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 2rem; }
.form-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.form-group { display: grid; gap: 0.45rem; margin-bottom: 1rem; }
.form-group label { font-size: 0.86rem; color: var(--text); font-weight: 750; }
.form-group input, .form-group select, .form-group textarea { width: 100%; background: rgba(2,5,11,0.55); border: 1px solid var(--border); border-radius: 12px; color: var(--text); font: inherit; padding: 0.78rem 0.9rem; outline: none; }
.form-group textarea { min-height: 140px; resize: vertical; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--solar); box-shadow: 0 0 0 4px rgba(255,183,3,0.08); }
footer { padding: 4rem 2rem 2rem; background: #03070e; border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 2rem; }
.footer-brand p, .footer-col a, .footer-bottom { color: var(--muted); }
.footer-col h4 { margin-bottom: 0.8rem; }
.footer-col ul { list-style: none; display: grid; gap: 0.45rem; }
.footer-bottom { width: min(1120px, 100%); margin: 2rem auto 0; padding-top: 1.2rem; border-top: 1px solid var(--border); font-size: 0.86rem; }
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-delay-1 { transition-delay: 0.08s; }
.fade-in-delay-2 { transition-delay: 0.16s; }
.fade-in-delay-3 { transition-delay: 0.24s; }

@media (max-width: 980px) {
  .hero-inner, .grid-2, .contact-grid { grid-template-columns: 1fr; }
  .grid-3, .grid-4, .stats-grid, .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-visual { transform: none; }
}
@media (max-width: 760px) {
  nav { padding: 0 1rem; }
  .nav-burger { display: flex; }
  .nav-links { position: fixed; top: 68px; left: 1rem; right: 1rem; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 0.8rem; background: rgba(5,9,19,0.98); border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow); }
  .nav-links.mobile-open { display: flex; }
  .nav-links a { display: block; padding: 0.75rem; }
  .nav-links a::after { display: none; }
  section { padding: 4.5rem 1rem; }
  .hero { padding: 6.5rem 1rem 3rem; }
  .page-hero { padding: 7.5rem 1rem 3rem; }
  .grid-3, .grid-4, .stats-grid, .footer-grid, .form-row { grid-template-columns: 1fr; }
  .process-item { grid-template-columns: 1fr; }
}