/* ════════════════════════════════════════════════════════════
   RISHSTACK TECHNOLOGIES — MAIN STYLESHEET
   All component and layout styles; colours via root.css vars.
════════════════════════════════════════════════════════════ */

/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background-color: var(--page-bg);
  color: var(--p-color);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; display: block; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
address { font-style: normal; }
::selection { background: rgba(99, 102, 241, 0.35); }

/* ── Heading Defaults (colours from :root) ──────────────── */
h1 {
  color: var(--h1-color);
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
}
h2 {
  color: var(--h2-color);
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
h3 {
  color: var(--h3-color);
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  font-weight: 600;
  line-height: 1.3;
}
h4 {
  color: var(--h4-color);
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
}
h5 { color: var(--h5-color); font-size: 0.9375rem; font-weight: 600; }
h6 {
  color: var(--h6-color);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
p { color: var(--p-color); }

/* ── Skip to content (screen reader / keyboard nav) ──────── */
.skip-link {
  position: absolute;
  top: -120%;
  left: 1rem;
  z-index: 10000;
  padding: 0.75rem 1.5rem;
  background: var(--accent-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  transition: top var(--transition-fast);
  white-space: nowrap;
}
.skip-link:focus { top: 1rem; outline: 3px solid #fff; outline-offset: 2px; }

/* ── Focus ring (accessibility) ─────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── Layout container ───────────────────────────────────── */
.container {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

/* ══════════════════════════════════════════════════════════
   HEADER
══════════════════════════════════════════════════════════ */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.header-inner {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

/* ── Logo ───────────────────────────────────────────────── */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  flex-shrink: 0;
}
.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.375rem;
  height: 2.375rem;
  background: var(--accent-primary);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 1.125rem;
  flex-shrink: 0;
}
.logo-text {
  font-family: var(--font-display);
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--header-text);
  letter-spacing: -0.025em;
  white-space: nowrap;
}
.logo-accent { color: var(--header-logo-accent); }

/* ══════════════════════════════════════════════════════════
   PRIMARY NAVIGATION
══════════════════════════════════════════════════════════ */
.site-nav { display: flex; align-items: center; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.125rem;
}

.nav-item { position: relative; }

/* Nav links and submenu triggers share base style */
.nav-link,
.submenu-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  color: var(--menu-link);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
.nav-link:hover,
.nav-link:focus-visible,
.submenu-trigger:hover,
.submenu-trigger:focus-visible {
  color: var(--menu-link-hover);
  background: var(--glass-bg);
}
.nav-link.active,
.submenu-trigger.active {
  color: var(--menu-link-active);
}

/* CTA button in nav */
.nav-link.nav-cta {
  background: var(--menu-cta-bg);
  color: var(--menu-cta-text);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  margin-left: 0.5rem;
  font-weight: 600;
}
.nav-link.nav-cta:hover { background: var(--menu-cta-hover-bg); }

/* Chevron on submenu triggers */
.submenu-trigger .bi-chevron-down {
  font-size: 0.7rem;
  transition: transform var(--transition);
}
.submenu-trigger[aria-expanded="true"] .bi-chevron-down { transform: rotate(180deg); }

/* ── Dropdown submenu ───────────────────────────────────── */
.submenu {
  position: absolute;
  top: calc(100% + 0.625rem);
  left: 0;
  min-width: 230px;
  background: var(--menu-sub-bg);
  border: 1px solid var(--menu-sub-border);
  border-radius: var(--radius-md);
  box-shadow: var(--menu-sub-shadow);
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  pointer-events: none;
  transition:
    opacity var(--transition),
    visibility var(--transition),
    transform var(--transition-slow);
  z-index: 200;
}

/* Show on hover or focus-within (desktop), or .open class (mobile) */
.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.submenu-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.625rem 0.875rem;
  color: var(--menu-sub-link);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.submenu-link:hover,
.submenu-link:focus-visible {
  color: var(--menu-sub-link-hover);
  background: var(--glass-bg);
}
.submenu-link .bi {
  font-size: 0.9375rem;
  color: var(--accent-primary);
  flex-shrink: 0;
  width: 1.125rem;
  text-align: center;
}

/* Submenu section divider */
.submenu-divider {
  height: 1px;
  background: var(--menu-sub-border);
  margin: 0.375rem 0.5rem;
}

/* ── Mobile hamburger toggle ────────────────────────────── */
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  color: var(--header-text);
  font-size: 1.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  flex-shrink: 0;
}
.menu-toggle:hover { background: var(--glass-bg); }

/* ══════════════════════════════════════════════════════════
   MAIN CONTENT AREA
══════════════════════════════════════════════════════════ */
#page-content {
  min-height: calc(100vh - var(--header-height));
  padding-top: var(--header-height);
  background: var(--content-bg);
  outline: none;
}

/* Loading spinner */
.loading-spinner {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
}
.spinner {
  width: 2.5rem;
  height: 2.5rem;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: rs-spin 0.75s linear infinite;
}
@keyframes rs-spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════════════ */
.site-footer {
  background: var(--footer-bg);
  border-top: 1px solid var(--footer-border);
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-lg);
}

.footer-inner {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--footer-border);
}

/* Brand column */
.footer-brand .logo { margin-bottom: 1.25rem; }
.footer-brand .logo-text { color: var(--h3-color); }
.footer-brand > p {
  color: var(--footer-text);
  font-size: 0.875rem;
  line-height: 1.8;
  max-width: 26rem;
  margin-bottom: 1.5rem;
}

/* Social icons row */
.social-links {
  display: flex;
  gap: 0.625rem;
}
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--footer-link);
  font-size: 1rem;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.social-link:hover {
  color: var(--footer-link-hover);
  border-color: var(--accent-primary);
  background: var(--accent-primary-dim);
}

/* Footer nav columns */
.footer-nav h4,
.footer-contact h4 {
  color: var(--footer-heading);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
}
.footer-nav ul,
.footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.footer-nav a {
  color: var(--footer-link);
  font-size: 0.875rem;
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--footer-link-hover); }

/* Contact column */
.footer-contact ul li { font-style: normal; }
.footer-contact a,
.footer-contact .fc-item {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  color: var(--footer-link);
  font-size: 0.875rem;
  transition: color var(--transition);
}
.footer-contact a:hover { color: var(--footer-link-hover); }
.footer-contact .bi {
  color: var(--accent-primary);
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

/* Footer bottom bar */
.footer-bar {
  padding-top: var(--space-md);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.footer-copy {
  font-size: 0.75rem;
  color: var(--footer-text);
  letter-spacing: 0.04em;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}
.footer-legal a {
  font-size: 0.75rem;
  color: var(--footer-text);
  letter-spacing: 0.04em;
  transition: color var(--transition);
}
.footer-legal a:hover { color: var(--footer-link-hover); }
.footer-credit {
  width: 100%;
  font-size: 0.8125rem;
  color: var(--p-muted);
  text-align: center;
  border-top: 1px solid var(--footer-border);
  padding-top: 1rem;
  margin-top: 0.5rem;
}
.footer-credit a {
  color: var(--footer-credit-link);
  font-weight: 500;
  transition: color var(--transition);
}
.footer-credit a:hover { color: var(--menu-link-hover); }

/* ══════════════════════════════════════════════════════════
   BACK TO TOP BUTTON
══════════════════════════════════════════════════════════ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 999;
  width: 3rem;
  height: 3rem;
  background: var(--accent-primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 1.125rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover { background: var(--menu-cta-hover-bg); transform: translateY(-3px); }

/* ══════════════════════════════════════════════════════════
   SHARED PAGE CONTENT COMPONENTS
══════════════════════════════════════════════════════════ */

/* Sections */
.section { padding-block: var(--space-2xl); }
.section-sm { padding-block: var(--space-xl); }
.section-alt { background: var(--content-alt-bg); }

/* Section header group */
.section-header { margin-bottom: var(--space-xl); }

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem;
  background: var(--accent-primary-dim);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-full);
  color: var(--accent-primary);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.section-underline {
  width: 3.5rem;
  height: 3px;
  background: var(--accent-primary);
  border-radius: var(--radius-full);
  margin-top: 1.25rem;
}

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.card:hover {
  background: var(--card-hover-bg);
  border-color: rgba(99, 102, 241, 0.18);
  transform: translateY(-4px);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-md);
  font-size: 1.375rem;
  margin-bottom: 1.375rem;
  flex-shrink: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-lg);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent-primary);
  color: #fff;
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.28);
}
.btn-primary:hover {
  background: #4f46e5;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(99, 102, 241, 0.38);
}
.btn-secondary {
  background: var(--accent-secondary);
  color: #0f172a;
  font-weight: 700;
}
.btn-secondary:hover { background: #06b6d4; transform: translateY(-2px); }
.btn-ghost {
  background: var(--glass-bg);
  color: var(--h3-color);
  border: 1px solid var(--glass-border);
}
.btn-ghost:hover { background: var(--card-hover-bg); color: #fff; }
.btn-outline {
  background: transparent;
  color: var(--accent-primary);
  border: 1.5px solid var(--accent-primary);
}
.btn-outline:hover { background: var(--accent-primary-dim); }

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

/* Stat block */
.stat-group {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  padding-top: 2.5rem;
  margin-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
}
.stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--h1-color);
  line-height: 1;
}
.stat-label {
  font-size: 0.7rem;
  color: var(--p-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.375rem;
}
.stat-divider {
  width: 1px;
  height: 2.5rem;
  background: var(--border-subtle);
  align-self: center;
}

/* Form elements */
.form-group { margin-bottom: 1.25rem; }
.form-label {
  display: block;
  color: var(--h5-color);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--h3-color);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  transition: border-color var(--transition), background var(--transition);
  outline: none;
  appearance: none;
}
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--input-focus-border);
  background: rgba(99, 102, 241, 0.05);
}
.form-input::placeholder,
.form-textarea::placeholder { color: var(--p-muted); }
.form-textarea { resize: vertical; min-height: 140px; }
.form-select { cursor: pointer; }

/* Tag / badge */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}
.tag-primary { background: var(--accent-primary-dim); color: var(--accent-primary); }
.tag-secondary { background: var(--accent-secondary-dim); color: var(--accent-secondary); }
.tag-amber { background: var(--accent-amber-dim); color: var(--accent-amber); }
.tag-emerald { background: var(--accent-emerald-dim); color: var(--accent-emerald); }
.tag-purple { background: var(--accent-purple-dim); color: var(--accent-purple); }

/* Alert / notice bar */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid;
  font-size: 0.875rem;
}
.alert-success {
  background: var(--accent-emerald-dim);
  border-color: rgba(16,185,129,0.25);
  color: var(--accent-emerald);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--border-subtle);
  margin-block: var(--space-xl);
}

/* Fade-in scroll animation */
.fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Page hero utility */
.page-hero {
  padding-block: var(--space-2xl);
  background: var(--content-alt-bg);
  border-bottom: 1px solid var(--border-subtle);
  text-align: center;
}
.page-hero h1 { font-size: clamp(2rem, 5vw, 3.5rem); margin-bottom: 1rem; }
.page-hero p {
  color: var(--p-lead);
  font-size: 1.0625rem;
  max-width: 42rem;
  margin-inline: auto;
}

/* ══════════════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .footer-brand { grid-column: 1 / -1; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  /* Show hamburger, hide desktop nav */
  .menu-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0; right: 0;
    background: var(--menu-mobile-bg);
    border-bottom: 1px solid var(--header-border);
    padding: 0.75rem 1.25rem 1.5rem;
    flex-direction: column;
    align-items: stretch;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    display: none;
  }
  .site-nav.open { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .nav-link,
  .submenu-trigger {
    padding: 0.875rem 0;
    border-bottom: 1px solid var(--border-subtle);
    border-radius: 0;
    font-size: 0.9375rem;
    width: 100%;
    justify-content: space-between;
  }
  .nav-link.nav-cta {
    margin: 1rem 0 0;
    padding: 0.875rem;
    justify-content: center;
    border-radius: var(--radius-md);
    border-bottom: none;
  }

  /* Mobile submenu accordion */
  .submenu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 0 0 0 1rem;
    background: transparent;
    display: none;
  }
  .submenu.open { display: block; }
  .has-submenu:hover .submenu,
  .has-submenu:focus-within .submenu { opacity: 1; visibility: visible; transform: none; }

  .submenu-link {
    padding: 0.625rem 0;
    border-bottom: 1px solid var(--border-subtle);
    border-radius: 0;
    font-size: 0.875rem;
  }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-brand { grid-column: auto; }
  .footer-bar { flex-direction: column; align-items: flex-start; }
  .footer-legal { gap: 0.875rem; }

  /* Grids collapse to single column */
  .grid-2,
  .grid-3 { grid-template-columns: 1fr; }

  .back-to-top { bottom: 1.25rem; right: 1.25rem; }
}

@media (max-width: 480px) {
  .stat-group { gap: 1.5rem; }
  .stat-divider { display: none; }
  .btn { padding: 0.75rem 1.5rem; font-size: 0.875rem; }
}