/* ============================================
   Pravadh Labs — Site polish, typography, mobile
   ============================================ */

:root {
  --header-h: 76px;
  --font-display: Georgia, 'Times New Roman', serif;
  --max-width: 1180px;
  --edge: clamp(24px, 5vw, 72px);
}

html {
  font-size: 16px;
  overflow-x: clip;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

/* Sticky-header offset for anchor navigation */
section[id] {
  scroll-margin-top: calc(var(--header-h) + 12px);
}

body {
  overflow-x: clip;
  min-height: 100vh;
  min-height: 100dvh;
}

img, svg, video, canvas {
  max-width: 100%;
  height: auto;
}

h1, h2, h3 {
  text-wrap: balance;
}

p, .hero .sub {
  text-wrap: pretty;
}

/* Layout — full designed width, no artificial column shrink */
.wrap {
  max-width: var(--max-width);
}

.hero h1 {
  max-width: none;
}

.hero .sub {
  max-width: 52ch;
}

.section-head {
  max-width: none;
}

.about-copy p {
  max-width: 68ch;
}

.rail-section .wrap {
  max-width: var(--max-width);
}

#railSvg {
  min-width: 0;
  width: 100%;
}

.sponsor-banner-wrap {
  max-width: 100%;
}

.sponsor-banner {
  min-width: 0;
}

/* Rail draw animation paths */
.rail-draw {
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke: var(--teal);
}

.rail-draw--amber {
  stroke: var(--amber);
}

.rail-draw--muted {
  stroke: var(--muted);
  opacity: 0.6;
}

.product-overview-grid {
  grid-template-columns: repeat(4, 1fr);
}

.module-card.pm-issues .tag { background: var(--teal); color: #FFFFFF; }
.module-card.pm-views .tag { background: #1E5CEE; color: #FFFFFF; }
.module-card.pm-brand .tag { background: var(--amber); color: #1A1200; }
.module-card.pm-runtime .tag { background: var(--muted-light); color: #1A1200; }
.module-card.si-connect .tag { background: #1E5CEE; color: #FFFFFF; }
.module-card.si-qualify .tag { background: var(--amber); color: #1A1200; }
.module-card.si-act .tag { background: var(--teal); color: #FFFFFF; }

.section-head h2 {
  letter-spacing: -0.015em;
}

.hero h1 {
  letter-spacing: -0.02em;
}

/* Header layout */
.site-header {
  z-index: 120;
}

.site-header .wrap {
  gap: 12px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: auto;
}

.logo {
  flex-shrink: 1;
  min-width: 0;
}

.logo .header-logo {
  width: clamp(108px, 28vw, 132px);
  height: auto;
}

/* ── Spacing — tighter but still breathable ── */
.hero {
  padding: 72px 0 56px;
}

section {
  padding: 64px 0;
}

.section-head {
  margin-bottom: 40px;
}

.rail-section,
.agent-workflow,
.pipeline-section {
  padding: 64px 0;
}

.about-block {
  gap: 48px;
}

.stat {
  padding: 24px 0;
}

footer {
  padding: 40px 0;
}

footer .wrap {
  gap: 28px;
}

.principle {
  padding: 28px 24px;
}

.section-border[style*="padding: 40px"] {
  padding: 32px 0 !important;
}

@media (max-width: 860px) {
  .hero {
    padding: 56px 0 48px;
  }

  section,
  .rail-section,
  .agent-workflow,
  .pipeline-section {
    padding: 48px 0;
  }

  .section-head {
    margin-bottom: 32px;
  }

  .about-block {
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 48px 0 40px;
  }

  section,
  .rail-section,
  .agent-workflow,
  .pipeline-section {
    padding: 40px 0;
  }
}

/* Nav polish */
nav.primary a {
  white-space: nowrap;
  position: relative;
  display: inline-block;
  line-height: 1.4;
}

nav.primary a::before {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

nav.primary a:hover::before,
nav.primary a.active::before {
  transform: scaleX(1);
}

nav.primary a.active::after {
  display: none;
}

nav.primary a.nav-contact {
  border: 1px solid var(--line-dark);
  padding: 8px 14px;
  border-radius: 3px;
  color: var(--paper) !important;
}

nav.primary a.nav-contact:hover {
  border-color: var(--teal);
  background: var(--teal-soft);
}

/* Trust strip */
.trust-strip {
  justify-content: center;
}

.trust-item {
  flex: 1 1 200px;
  min-width: 0;
}

/* Persona pills */
.persona {
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.persona:hover {
  transform: translateY(-2px);
  border-color: var(--teal);
  background: var(--teal-soft);
}

/* Footer */
footer .foot-links {
  flex-wrap: wrap;
  row-gap: 12px;
}

footer .foot-links a {
  position: relative;
  transition: color 0.2s ease;
}

footer .foot-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--teal);
  transform: scaleX(0);
  transition: transform 0.25s ease;
}

footer .foot-links a:hover::after {
  transform: scaleX(1);
}

.sponsor-banner-wrap {
  max-width: 100%;
}

.sponsor-banner {
  min-width: min(560px, 100%);
}

/* Rail section scroll hint on mobile */
.rail-section {
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.rail-section::-webkit-scrollbar {
  display: none;
}

/* Stat glow */
.stat .num {
  transition: text-shadow 0.4s ease;
}

.stat.is-counted .num {
  text-shadow: 0 0 24px rgba(30, 92, 238, 0.35);
}

/* Principle hover accent */
.principle {
  position: relative;
  overflow: hidden;
}

.principle::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--teal);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.35s ease;
}

.principle:hover::before {
  transform: scaleY(1);
}

/* Mobile nav overlay */
.nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 20, 42, 0.55);
  z-index: 110;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

html[data-theme="light"] .nav-backdrop {
  background: rgba(14, 22, 44, 0.35);
}

.nav-backdrop.is-visible {
  opacity: 1;
  pointer-events: all;
}

body.nav-open {
  overflow: hidden;
  touch-action: none;
}

/* Floating label animation for form fields */
.field input:focus + label,
.field textarea:focus + label,
.field select:focus + label {
  color: var(--teal-text);
}

/* Reduced particle density marker */
@media (max-width: 860px), (hover: none) {
  .hero-particles {
    opacity: 0.45;
  }
}

@media (max-width: 1200px) {
  .product-overview-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1024px) {
  nav.primary {
    gap: 28px;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 76px;
  }

  .site-header {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: var(--header-bg) !important;
  }

  nav.primary {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    z-index: 130;
    background: var(--ink);
    flex-direction: column;
    padding: 28px var(--edge) 40px;
    gap: 22px;
    align-items: stretch;
    border-top: 1px solid var(--line-dark);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    display: flex;
    width: 100%;
    max-width: 100vw;
    box-shadow: -8px 0 40px rgba(0, 0, 0, 0.15);
  }

  nav.primary.open {
    transform: translateX(0);
  }

  nav.primary a {
    font-size: 16px;
    padding: 4px 0;
    width: 100%;
  }

  nav.primary a.nav-contact {
    margin-top: 8px;
    text-align: center;
    padding: 12px 16px;
  }

  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 140;
  }

  .agent-workflow {
    padding: 56px 0;
  }

  .agent-step {
    margin-left: 16px;
    padding-left: 28px;
    grid-template-columns: 1fr;
  }

  .agent-step__num {
    position: absolute;
    left: -16px;
    top: 26px;
    margin-left: 0;
    width: auto;
    font-size: 11px;
  }

  .agent-workflow__viz {
    max-width: min(100%, 360px);
  }

  .trust-strip {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .trust-item {
    flex: none;
    width: 100%;
  }

  .product-overview-grid {
  grid-template-columns: 1fr;
}

.product-overview-card:hover,
  .module-card:hover {
    transform: none;
    box-shadow: none;
  }

  footer .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .modules-4 {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 480px) {
  :root {
    --header-h: 68px;
  }

  .site-header .wrap {
    height: var(--header-h);
  }

  nav.primary {
    inset: var(--header-h) 0 0 0;
    padding-top: 24px;
  }

  .hero h1 {
    max-width: none;
    font-size: clamp(32px, 9vw, 44px);
  }

  .hero .sub {
    font-size: 16px;
    max-width: none;
  }

  .section-head h2 {
    font-size: clamp(24px, 6.5vw, 32px);
  }

  .agent-step h3 {
    font-size: 16px;
  }

  .product-overview-card,
  .module-card {
    padding: 24px 20px;
  }

  .principle {
    padding: 24px 20px;
  }

  .stat .num {
    font-size: 28px;
  }

  .btn {
    min-height: 48px;
  }

  .theme-toggle,
  .menu-toggle {
    min-width: 44px;
    min-height: 44px;
  }
}

@media (max-width: 360px) {
  .logo .header-logo {
    width: 100px;
  }

  .foot-links {
    gap: 12px 16px !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  nav.primary a::before,
  footer .foot-links a::after,
  .persona:hover {
    transform: none;
    transition: none;
  }
}