:root {
  --accent: #4f8ef7;
  --accent-dark: #1e56d0;
  --accent-glow: rgba(79, 142, 247, 0.4);
  --accent-soft: rgba(79, 142, 247, 0.08);
  --accent-gradient: linear-gradient(135deg, #4f8ef7 0%, #1e56d0 100%);
  --neon-green: #00ff88;
  --text-main: #1a1a2e;
  --text-muted: #4a4a6a;
  --border-subtle: rgba(79, 142, 247, 0.15);
  --background: #fafbff;
  --background-gradient: linear-gradient(180deg, #ffffff 0%, #f0f4ff 100%);
  --shadow-soft: 0 12px 40px rgba(30, 86, 208, 0.08);
  --shadow-glow: 0 0 30px rgba(79, 142, 247, 0.2);
  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;
  --transition-fast: 150ms ease-out;
  --transition-med: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Skip link for accessibility */

.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--accent-gradient);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
  text-decoration: none;
  font-size: 0.9rem;
  border-radius: 0 0 var(--radius-s) 0;
}

.skip-link:focus {
  top: 0;
}

/* Subtle pulse animation for active elements */
@keyframes pulse-glow {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Global layout and typography */

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--background-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.page {
  padding: 1.2rem 1.2rem 1.5rem;
}

.inner {
  max-width: 720px;
  margin: 0 auto;
}

/* Header and navigation */

.site-header {
  padding: 0.85rem 1.2rem 0.25rem;
}

.site-header .inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0;
}

.branding {
  display: flex;
  flex-direction: column;
}

.brand-mark {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-subtitle {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  font-size: 0.9rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--text-muted);
  position: relative;
  padding-bottom: 0.1rem;
  transition: color var(--transition-fast);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background-color: var(--accent);
  transition: width var(--transition-fast);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text-main);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  width: 100%;
}

/* Hero */

.hero .inner {
  padding-top: 1rem;
  padding-bottom: 1.5rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 3vw + 1rem, 2.6rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-main) 0%, var(--accent-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .lede {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero-support {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 1.25rem;
  opacity: 0.85;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

a.btn-primary {
  text-decoration: none;
}


/* Sections */

.section {
  padding: 1.6rem 0;
}

.section-accent {
  margin-top: 0.75rem;
}

.section-accent .inner {
  padding-top: 0.75rem;
  padding-bottom: 0;
}

.section h2 {
  font-size: 1.3rem;
  margin: 0 0 0.75rem;
  font-weight: 600;
  color: var(--text-main);
}

.section p {
  margin: 0 0 0.75rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Use cases list */

.use-cases {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

.use-cases li {
  position: relative;
  padding: 0.6rem 0.75rem 0.6rem 2rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.6);
  border-radius: var(--radius-s);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.use-cases li:hover {
  background: rgba(255,255,255,0.9);
  border-color: var(--accent);
  transform: translateX(4px);
}

.use-cases li::before {
  content: "";
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-gradient);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Diagram */

.diagram-container {
  margin-top: 0.5rem;
  margin-bottom: 0.25rem;
  padding: 1rem;
  border-radius: var(--radius-l);
  border: 1px solid var(--border-subtle);
  background: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(240,244,255,0.9) 100%);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
}

.diagram-container::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 30%, var(--accent-soft) 0%, transparent 50%);
  pointer-events: none;
}

/* FAQ */

/* Mailchimp form overrides */

#mc_embed_signup {
  background: transparent !important;
  clear: left;
  font-family: inherit !important;
  width: 100% !important;
  max-width: 100% !important;
}

#mc_embed_signup h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
  color: var(--text-main);
}

#mc_embed_signup .indicates-required {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

#mc_embed_signup .mc-field-group {
  margin-bottom: 0.75rem;
}

#mc_embed_signup .mc-field-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  color: var(--text-main);
}

#mc_embed_signup .mc-field-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-m);
  border: 1px solid var(--border-subtle);
  font-size: 0.95rem;
  outline: none;
  background: rgba(255,255,255,0.8);
  transition: all var(--transition-med);
}

#mc_embed_signup .mc-field-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow-glow);
  background: #ffffff;
}

#mc_embed_signup .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: all var(--transition-med);
  margin-top: 0.75rem;
  box-shadow: 0 4px 15px var(--accent-glow);
}

#mc_embed_signup .button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow), 0 0 20px var(--accent-glow);
}

#mc_embed_signup .asterisk {
  color: var(--accent);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: all var(--transition-med);
  box-shadow: 0 4px 15px var(--accent-glow);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow), 0 0 20px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 4px 15px var(--accent-glow);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 1.25rem 1.5rem;
  background: linear-gradient(180deg, transparent 0%, rgba(79, 142, 247, 0.03) 100%);
}

.site-footer .inner {
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.8;
}

.site-footer .footer-contact {
  color: var(--text-muted);
  text-decoration: none;
  opacity: 0.9;
}
.site-footer .footer-contact:hover,
.site-footer .footer-contact:focus {
  text-decoration: underline;
  color: var(--accent-dark);
}

/* SVG diagram theming */

.diagram-svg {
  width: 100%;
  max-width: 560px;
  height: auto;
  position: relative;
  z-index: 1;
}

.diagram-label {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  font-size: 10px;
  fill: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.diagram-user {
  fill: rgba(255,255,255,0.9);
  stroke: url(#userGradient);
  stroke-width: 2.5;
  filter: drop-shadow(0 2px 8px var(--accent-glow));
}

.diagram-storage {
  fill: rgba(255,255,255,0.95);
  stroke: #a0aec0;
  stroke-width: 1.5;
  transition: all var(--transition-med);
}

.diagram-storage--active {
  stroke: var(--accent);
  stroke-width: 2.5;
  filter: drop-shadow(0 0 15px var(--accent-glow)) drop-shadow(0 0 30px rgba(0, 255, 136, 0.2));
}

.diagram-compartment {
  fill: var(--accent-soft);
  transition: all var(--transition-med);
}

.diagram-compartment--active {
  fill: var(--neon-green);
  filter: drop-shadow(0 0 8px rgba(0, 255, 136, 0.6));
}

.diagram-bubble {
  fill: none;
  stroke: none;
}

.diagram-bubble-text {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  font-size: 9.5px;
  fill: var(--accent-dark);
  stroke: none;
  font-weight: 500;
}

.diagram-wave-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.2;
  opacity: 0;
  transition: opacity 260ms ease-out;
  filter: drop-shadow(0 0 4px var(--accent-glow));
}

/* Responsive adjustments */

@media (max-width: 720px) {
  .page {
    padding-top: 1rem;
  }

  .section,
  .hero .inner {
    padding-inline: 0.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}