/* =============================================
   PLAI — Dark Tech Stylesheet
   ============================================= */

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

:root {
  --bg-base:     #070810;
  --bg-surface:  #0d0f1e;
  --bg-card:     #111428;
  --bg-card-alt: #0f1220;
  --border:      rgba(255,255,255,0.07);
  --border-glow: rgba(99,179,237,0.25);

  --blue:   #4fa3f7;
  --cyan:   #38f0c8;
  --purple: #a78bfa;
  --green:  #4ade80;
  --orange: #fb923c;

  --grad-primary: linear-gradient(135deg, #4fa3f7, #38f0c8);
  --grad-hero:    linear-gradient(135deg, #4fa3f7 0%, #a78bfa 50%, #38f0c8 100%);

  --text-primary: #f0f4ff;
  --text-sec:     #8892b0;
  --text-dim:     #4a5568;

  --font-sans: 'Inter', system-ui, sans-serif;
  --font-head: 'Space Grotesk', system-ui, sans-serif;

  --nav-h: 72px;
  --radius: 12px;
  --radius-lg: 20px;

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

::selection { background: rgba(79, 163, 247, 0.3); }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: rgba(79,163,247,0.3); border-radius: 3px; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  white-space: nowrap;
}

.btn--primary {
  background: var(--grad-primary);
  color: #070810;
  font-weight: 600;
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79,163,247,0.35);
}

.btn--outline {
  border: 1px solid var(--border-glow);
  color: var(--blue);
  background: transparent;
}
.btn--outline:hover {
  background: rgba(79,163,247,0.08);
  border-color: var(--blue);
}

.btn--ghost {
  background: rgba(255,255,255,0.06);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.1);
}

.btn--full { width: 100%; justify-content: center; }

/* ---------- NAV ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  transition: var(--transition);
}

.nav.scrolled {
  background: rgba(7,8,16,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.logo-mark { color: var(--text-primary); }
.logo-accent { color: var(--cyan); }

.nav__links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav__links a:not(.btn) {
  color: var(--text-sec);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav__links a:not(.btn):hover { color: var(--text-primary); }

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

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: rgba(7,8,16,0.97);
  backdrop-filter: blur(20px);
  flex-direction: column;
  padding: 24px;
  gap: 4px;
  z-index: 99;
  border-bottom: 1px solid var(--border);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-sec);
  font-size: 1rem;
  transition: color var(--transition);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { color: var(--text-primary); }

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}

#plasmaCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  padding: 80px 24px;
}

.hero__badge {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--border-glow);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--cyan);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 28px;
  background: rgba(56,240,200,0.06);
}

.hero__title {
  font-family: var(--font-head);
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.gradient-text {
  background: var(--grad-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__sub {
  font-size: 1.1rem;
  color: var(--text-sec);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: 40px;
}

.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero__stats {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat__num {
  display: block;
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
}
.stat__unit {
  font-size: 1.1rem;
  color: var(--cyan);
}
.stat__label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-sec);
  margin-top: 2px;
}
.stat__divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.hero__scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  z-index: 2;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-dim), transparent);
  animation: scrollAnim 1.8s ease-in-out infinite;
}
@keyframes scrollAnim {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.5); }
}

/* ---------- Section Common ---------- */
.section { padding: 100px 0; }

.section__header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 16px;
}

.section__title {
  font-family: var(--font-head);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section__desc {
  color: var(--text-sec);
  font-size: 1rem;
  line-height: 1.7;
}

/* ---------- Products ---------- */
.products { background: var(--bg-surface); }

.products__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: var(--transition);
  overflow: hidden;
}

.product-card::before {
  content: attr(data-index);
  position: absolute;
  top: 20px;
  right: 24px;
  font-family: var(--font-head);
  font-size: 3.5rem;
  font-weight: 700;
  color: rgba(255,255,255,0.03);
  line-height: 1;
  pointer-events: none;
}

.product-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-6px);
  box-shadow: 0 20px 48px rgba(0,0,0,0.4), 0 0 0 1px rgba(79,163,247,0.1);
}

.product-card--featured {
  border-color: rgba(79,163,247,0.3);
  background: linear-gradient(145deg, #111c35, #0d1525);
}
.product-card--featured::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(79,163,247,0.08), transparent 60%);
  pointer-events: none;
}

.product-card__badge {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 4px 10px;
  background: var(--grad-primary);
  color: #070810;
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 100px;
}

.product-card__icon {
  width: 52px;
  height: 52px;
  color: var(--blue);
}
.product-card--featured .product-card__icon { color: var(--cyan); }
.product-card:last-child .product-card__icon { color: var(--purple); }

.product-card__body h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.product-card__body p {
  color: var(--text-sec);
  font-size: 0.9rem;
  line-height: 1.65;
}

.product-card__specs {
  list-style: none;
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.product-card__specs li {
  font-size: 0.82rem;
  color: var(--text-dim);
  padding-left: 14px;
  position: relative;
}
.product-card__specs li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--cyan);
  font-size: 0.7rem;
}

.product-card__link {
  margin-top: auto;
  color: var(--blue);
  font-size: 0.88rem;
  font-weight: 500;
  transition: color var(--transition), gap var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.product-card__link:hover { color: var(--cyan); gap: 10px; }

/* ---------- Solutions / Features ---------- */
.solutions { background: var(--bg-base); }

.solutions__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.feature {
  background: var(--bg-base);
  padding: 36px 32px;
  transition: background var(--transition);
}
.feature:hover { background: var(--bg-card); }

.feature__icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.feature__icon svg { width: 22px; height: 22px; }

.feature__icon--blue   { background: rgba(79,163,247,0.1);  color: var(--blue);   }
.feature__icon--cyan   { background: rgba(56,240,200,0.1);  color: var(--cyan);   }
.feature__icon--purple { background: rgba(167,139,250,0.1); color: var(--purple); }
.feature__icon--green  { background: rgba(74,222,128,0.1);  color: var(--green);  }
.feature__icon--orange { background: rgba(251,146,60,0.1);  color: var(--orange); }

.feature h4 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature p {
  font-size: 0.88rem;
  color: var(--text-sec);
  line-height: 1.6;
}

/* ---------- About ---------- */
.about { background: var(--bg-surface); overflow: hidden; }

.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

/* Orbital visual */
.about__visual {
  position: relative;
  width: 380px;
  height: 380px;
  margin: 0 auto;
  flex-shrink: 0;
}

.about__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.about__ring--1 { width: 100%; height: 100%; border-color: rgba(79,163,247,0.12); }
.about__ring--2 { width: 75%; height: 75%; border-color: rgba(56,240,200,0.15); }
.about__ring--3 { width: 50%; height: 50%; border-color: rgba(167,139,250,0.18); }

.about__core {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 100px; height: 100px;
  background: radial-gradient(circle, rgba(79,163,247,0.2), rgba(56,240,200,0.1));
  border: 1px solid rgba(79,163,247,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--cyan);
}

.about__orbit {
  position: absolute;
  top: 50%; left: 50%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}
.about__orbit--1 {
  width: 100%; height: 100%;
  animation: orbit1 12s linear infinite;
}
.about__orbit--2 {
  width: 75%; height: 75%;
  animation: orbit2 8s linear infinite reverse;
}

.orbit__dot {
  position: absolute;
  top: 0; left: 50%;
  transform: translate(-50%, -50%);
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 12px var(--blue);
}
.about__orbit--2 .orbit__dot { background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }

@keyframes orbit1 { from { transform: translate(-50%,-50%) rotate(0deg); } to { transform: translate(-50%,-50%) rotate(360deg); } }
@keyframes orbit2 { from { transform: translate(-50%,-50%) rotate(0deg); } to { transform: translate(-50%,-50%) rotate(360deg); } }

.about__content { flex: 1; }

.about__text {
  color: var(--text-sec);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 16px;
}

.about__values {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 32px;
}

.value {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.value__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  margin-top: 6px;
  flex-shrink: 0;
}

.value strong {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.value span {
  font-size: 0.85rem;
  color: var(--text-sec);
}

/* ---------- Contact ---------- */
.contact { background: var(--bg-base); }

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 48px;
  align-items: start;
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-sec);
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(79,163,247,0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-dim); }

.form-group select option { background: var(--bg-card); }

.form-group textarea { resize: vertical; min-height: 110px; }

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
}

.contact__item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact__icon {
  width: 42px; height: 42px;
  background: rgba(79,163,247,0.08);
  border: 1px solid rgba(79,163,247,0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--blue);
}
.contact__icon svg { width: 18px; height: 18px; }

.contact__item strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 2px;
}
.contact__item span {
  font-size: 0.85rem;
  color: var(--text-sec);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  padding: 56px 24px 40px;
}

.footer__brand p {
  color: var(--text-sec);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-top: 14px;
  max-width: 320px;
}

.footer__links {
  display: flex;
  gap: 60px;
}

.footer__links > div {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__links strong {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.footer__links a {
  font-size: 0.85rem;
  color: var(--text-sec);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--text-primary); }

.footer__bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
}

.footer__bottom .container {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .products__grid { grid-template-columns: 1fr 1fr; }
  .solutions__grid { grid-template-columns: repeat(2, 1fr); }
  .about__inner { grid-template-columns: 1fr; gap: 48px; }
  .about__visual { width: 280px; height: 280px; }
  .contact__grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
  .products__grid { grid-template-columns: 1fr; }
  .solutions__grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; gap: 32px; }
  .footer__links { flex-direction: column; gap: 28px; }
  .footer__bottom .container { flex-direction: column; gap: 6px; }
  .hero__stats { gap: 20px; }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; justify-content: center; }
}