:root {
  --cardio-void: #090b11;
  --cardio-nebula: #131722;
  --cardio-surface: #1b2132;
  --cardio-pulse: #00ffb3;
  --cardio-pulse-glow: rgba(0, 255, 179, 0.35);
  --cardio-accent-alt: #00e5ff;
  --cardio-vapor-light: rgba(255, 255, 255, 0.08);
  --cardio-vapor-border: rgba(255, 255, 255, 0.15);
  --cardio-ink-light: #f1f5f9;
  --cardio-ink-dim: #94a3b8;
  --cardio-ink-dark: #0f172a;
  
  --font-display: 'Montserrat', sans-serif;
  --font-body: 'Poppins', sans-serif;
}

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

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

body {
  background-color: var(--cardio-void);
  color: var(--cardio-ink-light);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--cardio-ink-light);
  line-height: 1.2;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s ease, border-color 0.3s ease;
}

/* Scroll-driven Progress Bar */
.cardio-read-progress {
  height: 4px;
  width: 0;
  background: linear-gradient(90deg, var(--cardio-pulse), var(--cardio-accent-alt));
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10001;
  animation: cardio-progress-grow linear;
  animation-timeline: scroll();
}

@keyframes cardio-progress-grow {
  to { width: 100%; }
}

/* Sticky Header styling */
.cardio-navigation-canopy {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(9, 11, 17, 0.85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--cardio-vapor-border);
  padding: 1rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cardio-branding-emblem {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cardio-branding-emblem svg {
  fill: var(--cardio-pulse);
  filter: drop-shadow(0 0 8px var(--cardio-pulse-glow));
}

.cardio-branding-emblem span {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: linear-gradient(135deg, #ffffff 30%, var(--cardio-pulse));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cardio-menu-checkbox {
  display: none;
}

.cardio-menu-trigger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  z-index: 1001;
}

.cardio-menu-trigger span {
  display: block;
  width: 28px;
  height: 3px;
  background-color: var(--cardio-ink-light);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.cardio-navigable-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.cardio-anchor-node {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: 0.5rem 0;
}

.cardio-anchor-node::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--cardio-pulse);
  transition: width 0.3s ease;
}

.cardio-anchor-node:hover::after {
  width: 100%;
}

.cardio-anchor-node:hover {
  color: var(--cardio-pulse);
}

.cardio-action-anchor {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  background: var(--cardio-pulse);
  color: var(--cardio-ink-dark);
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.85rem;
  border-radius: 12px;
  box-shadow: 0 4px 15px var(--cardio-pulse-glow);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  border: none;
  cursor: pointer;
}

.cardio-action-anchor:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 255, 179, 0.5);
  background-color: #00e6a1;
}

/* Hero Section (Preset D - Dark Immersive) */
.cardio-portal-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 5%;
  background-image: linear-gradient(rgba(9, 11, 17, 0.75), rgba(9, 11, 17, 0.85)), url('img/bg.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.cardio-glassmorphism-shield {
  background: rgba(255, 255, 255, 0.05);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid var(--cardio-vapor-border);
  border-radius: 20px;
  padding: 4rem;
  max-width: 750px;
  width: 100%;
  text-align: center;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.cardio-glassmorphism-shield h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  line-height: 1.1;
  background: linear-gradient(135deg, #ffffff, var(--cardio-accent-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cardio-glassmorphism-shield p {
  font-size: 1.15rem;
  color: var(--cardio-ink-dim);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Split Content Section */
.cardio-split-vista {
  display: flex;
  min-height: 70vh;
  border-top: 1px solid var(--cardio-vapor-border);
  border-bottom: 1px solid var(--cardio-vapor-border);
  background-color: var(--cardio-nebula);
}

.cardio-media-flank {
  flex: 1;
  background-image: linear-gradient(rgba(9, 11, 17, 0.2), rgba(9, 11, 17, 0.6)), url('img/bg2.webp');
  background-size: cover;
  background-position: center;
  min-height: 400px;
}

.cardio-intellect-flank {
  flex: 1;
  padding: 10vh 5%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background-color: var(--cardio-surface);
}

.cardio-intellect-flank h2 {
  font-size: 2.25rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.cardio-intellect-flank h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background-color: var(--cardio-pulse);
  margin-top: 1rem;
  border-radius: 2px;
}

.cardio-intellect-flank p {
  color: var(--cardio-ink-dim);
  margin-bottom: 2rem;
}

.cardio-bullet-directory {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.cardio-bullet-directory li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.cardio-bullet-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--cardio-pulse);
  box-shadow: 0 0 8px var(--cardio-pulse-glow);
  margin-top: 0.4rem;
  flex-shrink: 0;
}

.cardio-bullet-directory span {
  font-weight: 500;
}

/* Features Grid (Preset D Glassmorphism Row) */
.cardio-panorama-features {
  padding: 10dvh 5%;
  background-color: var(--cardio-void);
  text-align: center;
}

.cardio-panorama-features h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cardio-panorama-features p.cardio-section-sub {
  color: var(--cardio-ink-dim);
  max-width: 600px;
  margin: 0 auto 4rem auto;
}

.cardio-features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.cardio-glassmorphism-module {
  background: rgba(255, 255, 255, 0.03);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--cardio-vapor-border);
  border-top: 3px solid var(--cardio-pulse);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: left;
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.cardio-glassmorphism-module:hover {
  transform: translateY(-5px);
  border-top-color: var(--cardio-accent-alt);
  box-shadow: 0 10px 25px rgba(0, 229, 255, 0.15);
}

.cardio-icon-capsule {
  width: 64px;
  height: 64px;
  border-radius: 12px;
  background-color: rgba(0, 255, 179, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.cardio-icon-capsule svg {
  fill: var(--cardio-pulse);
  width: 32px;
  height: 32px;
}

.cardio-glassmorphism-module h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.cardio-glassmorphism-module p {
  color: var(--cardio-ink-dim);
  font-size: 0.95rem;
}

/* Timeline Section (How it Works) */
.cardio-timeline-arena {
  padding: 10dvh 5%;
  background-color: var(--cardio-nebula);
}

.cardio-timeline-arena h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 4rem;
}

.cardio-vertical-conduit {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-left: 3rem;
}

.cardio-vertical-conduit::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cardio-pulse), var(--cardio-accent-alt));
}

.cardio-timeline-station {
  position: relative;
  margin-bottom: 3.5rem;
}

.cardio-timeline-station:last-child {
  margin-bottom: 0;
}

.cardio-station-indicator {
  position: absolute;
  left: -48px;
  top: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--cardio-void);
  border: 3px solid var(--cardio-pulse);
  box-shadow: 0 0 12px var(--cardio-pulse-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--cardio-pulse);
}

.cardio-timeline-station h3 {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
}

.cardio-timeline-station p {
  color: var(--cardio-ink-dim);
}

/* CTA Strip (Ghost Button, Dark Layout) */
.cardio-concluding-banner {
  padding: 10dvh 5%;
  background-image: linear-gradient(135deg, var(--cardio-surface), var(--cardio-void));
  text-align: center;
  border-top: 1px solid var(--cardio-vapor-border);
}

.cardio-concluding-banner h2 {
  font-size: 2.75rem;
  margin-bottom: 1rem;
}

.cardio-concluding-banner p {
  color: var(--cardio-ink-dim);
  max-width: 650px;
  margin: 0 auto 2.5rem auto;
  font-size: 1.1rem;
}

.cardio-ghost-anchor {
  display: inline-block;
  padding: 0.75rem 2rem;
  border: 2px solid var(--cardio-pulse);
  color: var(--cardio-pulse);
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.85rem;
  border-radius: 12px;
  transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

.cardio-ghost-anchor:hover {
  background-color: var(--cardio-pulse);
  color: var(--cardio-ink-dark);
  box-shadow: 0 0 20px var(--cardio-pulse-glow);
}

/* Accordion Section (Expert.html) */
.cardio-accordion-sector {
  padding: 10dvh 5%;
  background-color: var(--cardio-void);
}

.cardio-accordion-sector h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 4rem;
}

.cardio-accordion-registry {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.cardio-accordion-module {
  background-color: var(--cardio-nebula);
  border: 1px solid var(--cardio-vapor-border);
  border-radius: 12px;
  overflow: hidden;
}

.cardio-accordion-module[open] {
  border-color: var(--cardio-pulse);
}

.cardio-accordion-trigger {
  padding: 1.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--cardio-ink-light);
}

.cardio-accordion-trigger::-webkit-details-marker {
  display: none;
}

.cardio-accordion-trigger::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--cardio-pulse);
  transition: transform 0.3s ease;
}

.cardio-accordion-module[open] .cardio-accordion-trigger::after {
  content: '−';
  transform: rotate(180deg);
}

.cardio-accordion-payload {
  padding: 0 1.5rem 1.5rem 1.5rem;
  color: var(--cardio-ink-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 0.5rem;
}

/* Row of Stat Blocks */
.cardio-numeric-array {
  padding: 8dvh 5%;
  background-color: var(--cardio-surface);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  text-align: center;
  border-top: 1px solid var(--cardio-vapor-border);
  border-bottom: 1px solid var(--cardio-vapor-border);
}

.cardio-stat-pod h3 {
  font-size: 3.5rem;
  color: var(--cardio-pulse);
  text-shadow: 0 0 15px var(--cardio-pulse-glow);
  margin-bottom: 0.5rem;
}

.cardio-stat-pod p {
  color: var(--cardio-ink-dim);
  font-family: var(--font-display);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

/* Image Showcase Overlay */
.cardio-spectacle-panorama {
  position: relative;
  height: 50vh;
  background-image: linear-gradient(rgba(9, 11, 17, 0.4), rgba(9, 11, 17, 0.85)), url('img/bg3.webp');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 5%;
}

.cardio-spectacle-text-block {
  max-width: 800px;
}

.cardio-spectacle-text-block h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cardio-spectacle-text-block p {
  font-size: 1.15rem;
  color: var(--cardio-ink-light);
}

/* Form Styles */
.cardio-registry-hearth {
  min-height: 100vh;
  padding: 8rem 5% 4rem 5%;
  background-image: linear-gradient(rgba(9, 11, 17, 0.8), rgba(9, 11, 17, 0.9)), url('img/bg.webp');
  background-size: cover;
  background-position: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.cardio-elevated-hull {
  background: rgba(255, 255, 255, 0.04);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid var(--cardio-vapor-border);
  border-radius: 20px;
  padding: 3.5rem;
  max-width: 600px;
  width: 100%;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.5);
  margin-bottom: 4rem;
}

.cardio-elevated-hull h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  text-align: center;
  background: linear-gradient(135deg, #ffffff, var(--cardio-pulse));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cardio-field-unit {
  margin-bottom: 1.5rem;
}

.cardio-field-unit label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  color: var(--cardio-ink-light);
}

.cardio-field-unit input, .cardio-field-unit textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--cardio-vapor-border);
  padding: 1rem;
  border-radius: 12px;
  color: var(--cardio-ink-light);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.cardio-field-unit input:focus, .cardio-field-unit textarea:focus {
  outline: none;
  border-color: var(--cardio-pulse);
  background-color: rgba(255, 255, 255, 0.08);
}

.cardio-regulatory-consent {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.cardio-regulatory-consent input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--cardio-pulse);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.cardio-regulatory-consent label {
  font-size: 0.85rem;
  color: var(--cardio-ink-dim);
}

.cardio-regulatory-consent a {
  color: var(--cardio-pulse);
  text-decoration: underline;
}

.cardio-button-capsule {
  width: 100%;
  text-align: center;
}

.cardio-button-capsule button {
  width: 100%;
}

.cardio-contact-hotlink {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--cardio-ink-dim);
}

.cardio-contact-hotlink a {
  color: var(--cardio-pulse);
  font-weight: 600;
}

/* Standard Editorial Block */
.cardio-editorial-segment {
  padding: 10dvh 10%;
  background-color: var(--cardio-void);
  min-height: 80vh;
}

.cardio-editorial-segment h1 {
  font-size: 2.5rem;
  margin-bottom: 2.5rem;
}

.cardio-editorial-block {
  margin-bottom: 2.5rem;
}

.cardio-editorial-block h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--cardio-accent-alt);
}

.cardio-editorial-block p {
  color: var(--cardio-ink-dim);
  margin-bottom: 1rem;
}

/* Footer Section */
.cardio-footer-basement {
  background-color: var(--cardio-void);
  border-top: 1px solid var(--cardio-vapor-border);
  padding: 5rem 5% 2rem 5%;
}

.cardio-footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto 4rem auto;
}

.cardio-footer-pillar h4 {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--cardio-pulse);
}

.cardio-footer-pillar p {
  color: var(--cardio-ink-dim);
  font-size: 0.95rem;
}

.cardio-footer-directory {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cardio-footer-directory a {
  color: var(--cardio-ink-dim);
  font-size: 0.95rem;
}

.cardio-footer-directory a:hover {
  color: var(--cardio-pulse);
}

.cardio-disclaimer-panel {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  border-top: 1px solid var(--cardio-vapor-border);
  padding-top: 2rem;
  color: var(--cardio-ink-dim);
  font-size: 0.85rem;
}

.cardio-copyright-tag {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.2);
}

/* Cookie Banner styling */
.cardio-cookie-vigil {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: var(--cardio-surface);
  border-top: 2px solid var(--cardio-pulse);
  padding: 1.5rem 5%;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  z-index: 9999;
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.5);
  transform: translateY(100%);
  transition: transform 0.4s ease;
}

.cardio-cookie-vigil.is-displayed {
  transform: translateY(0);
}

.cardio-cookie-vigil p {
  font-size: 0.9rem;
  color: var(--cardio-ink-light);
  max-width: 800px;
}

.cardio-cookie-vigil a {
  color: var(--cardio-pulse);
  text-decoration: underline;
}

.cardio-cookie-btns {
  display: flex;
  gap: 1rem;
}

.cardio-cookie-accept {
  background-color: var(--cardio-pulse);
  color: var(--cardio-ink-dark);
  border: none;
  padding: 0.6rem 1.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.8rem;
  border-radius: 8px;
  cursor: pointer;
  text-transform: uppercase;
}

.cardio-cookie-decline {
  background-color: transparent;
  color: var(--cardio-ink-dim);
  border: 1px solid var(--cardio-vapor-border);
  padding: 0.6rem 1.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.8rem;
  border-radius: 8px;
  cursor: pointer;
  text-transform: uppercase;
  transition: color 0.3s, border-color 0.3s;
}

.cardio-cookie-decline:hover {
  color: var(--cardio-ink-light);
  border-color: var(--cardio-ink-light);
}

/* Media Queries for Responsiveness */
@media (max-width: 968px) {
  .cardio-navigation-canopy {
    padding: 1rem 5%;
  }

  .cardio-menu-trigger {
    display: flex;
  }

  .cardio-navigable-links {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    height: calc(100vh - 72px);
    background-color: var(--cardio-void);
    flex-direction: column;
    justify-content: center;
    gap: 2.5rem;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    z-index: 999;
  }

  .cardio-menu-checkbox:checked ~ .cardio-navigable-links {
    transform: translateX(0);
  }

  .cardio-menu-checkbox:checked ~ .cardio-menu-trigger span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }

  .cardio-menu-checkbox:checked ~ .cardio-menu-trigger span:nth-child(2) {
    opacity: 0;
  }

  .cardio-menu-checkbox:checked ~ .cardio-menu-trigger span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }

  .cardio-glassmorphism-shield h1 {
    font-size: 2.25rem;
  }

  .cardio-split-vista {
    flex-direction: column;
  }

  .cardio-media-flank {
    min-height: 300px;
  }

  .cardio-glassmorphism-shield {
    padding: 2.5rem;
  }
}

@media (max-width: 480px) {
  .cardio-glassmorphism-shield h1 {
    font-size: 1.85rem;
  }

  .cardio-elevated-hull {
    padding: 2rem 1.5rem;
  }
}