:root {
  --bg: #f8fafc;
  --bg-secondary: #ffffff;
  --ink: #1e293b;
  --muted: #64748b;
  --brand: #18a999;
  --brand-2: #5ce0d8;
  --brand-light: #e0f7f5;
  --card: #ffffff;
  --ring: #9fe870;
  --danger: #ef4444;
  --border: #e2e8f0;
  --shadow: rgba(0, 0, 0, 0.05);
  --shadow-lg: rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 0;
  font-size: 1rem;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

body.nz-body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
}

/* Animated background */
body.nz-body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(24, 169, 153, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(92, 224, 216, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(159, 232, 112, 0.05) 0%, transparent 50%);
  animation: backgroundShift 20s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes backgroundShift {
  0%, 100% {
    transform: translate(0, 0) scale(1);
    opacity: 1;
  }
  33% {
    transform: translate(20px, 20px) scale(1.05);
    opacity: 0.9;
  }
  66% {
    transform: translate(-20px, 10px) scale(0.95);
    opacity: 0.95;
  }
}

/* Floating particles animation */
body.nz-body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(2px 2px at 20% 30%, rgba(24, 169, 153, 0.3), transparent),
    radial-gradient(2px 2px at 60% 70%, rgba(92, 224, 216, 0.3), transparent),
    radial-gradient(1px 1px at 50% 50%, rgba(159, 232, 112, 0.4), transparent),
    radial-gradient(1px 1px at 80% 10%, rgba(24, 169, 153, 0.2), transparent),
    radial-gradient(2px 2px at 90% 60%, rgba(92, 224, 216, 0.25), transparent),
    radial-gradient(1px 1px at 30% 80%, rgba(159, 232, 112, 0.3), transparent);
  background-repeat: repeat;
  background-size: 200% 200%;
  animation: particleFloat 30s linear infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes particleFloat {
  0% {
    background-position: 0% 0%;
  }
  100% {
    background-position: 100% 100%;
  }
}

/* Global type rhythm */
h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 0.6em;
}

h2 {
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0 0 0.6em;
}

h3 {
  font-size: 1.25rem;
  line-height: 1.2;
  margin: 0 0 0.6em;
}

h4 {
  font-size: 1.125rem;
  line-height: 1.2;
  margin: 0 0 0.6em;
}

p, ul, ol {
  margin: 0.6em 0;
}

p {
  overflow-wrap: anywhere;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  padding: 0.5rem 1rem;
  background: var(--brand);
  color: #fff;
  z-index: 999;
  border-radius: 8px;
}

.nz-wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

/* Header */
.nz-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px var(--shadow);
}

.nz-header .nz-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.nz-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  text-decoration: none;
  transition: opacity 0.2s;
}

.nz-brand:hover {
  opacity: 0.8;
}

.nz-logo {
  width: 28px;
  height: 28px;
  animation: logoPulse 3s ease-in-out infinite;
}

@keyframes logoPulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.nz-brand-text {
  font-weight: 700;
  letter-spacing: 0.2px;
}

/* Burger menu */
.nz-burger {
  all: unset;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  background: var(--bg-secondary);
  transition: all 0.3s ease;
  position: relative;
  z-index: 51;
}

.nz-burger:hover {
  background: var(--brand-light);
  border-color: var(--brand);
  transform: scale(1.05);
}

.nz-burger-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  position: relative;
  transition: all 0.3s ease;
  border-radius: 2px;
}

.nz-burger-bar::before,
.nz-burger-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transition: all 0.3s ease;
  border-radius: 2px;
}

.nz-burger-bar::before {
  top: -6px;
}

.nz-burger-bar::after {
  top: 6px;
}

.nz-burger.open .nz-burger-bar {
  background: transparent;
}

.nz-burger.open .nz-burger-bar::before {
  top: 0;
  transform: rotate(45deg);
}

.nz-burger.open .nz-burger-bar::after {
  top: 0;
  transform: rotate(-45deg);
}

.nz-main [id] {
  scroll-margin-top: 84px;
}

/* Navigation */
.nz-nav {
  position: fixed;
  inset: 64px 0 auto 0;
  transform: translateY(-120%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: saturate(180%) blur(20px);
  padding: 20px 0;
  max-height: calc(100dvh - 64px);
  overflow: auto;
  box-shadow: 0 4px 6px var(--shadow-lg);
  border-bottom: 1px solid var(--border);
  z-index: 49;
}

.nz-nav.open {
  transform: translateY(0);
}

.nz-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.nz-nav-list a {
  display: block;
  padding: 0.7rem 1.2rem;
  color: var(--ink);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
}

.nz-nav-list a:focus,
.nz-nav-list a:hover {
  background: var(--brand-light);
  border-color: var(--brand);
  padding-left: 1.4rem;
}

@media (min-width: 920px) {
  .nz-burger {
    display: none;
  }
  
  .nz-nav {
    all: unset;
    display: block;
    position: static;
    background: transparent;
    padding: 0;
    box-shadow: none;
    border: none;
  }
  
  .nz-nav-list {
    display: flex;
    gap: 0.8rem;
  }
  
  .nz-nav-list a {
    border: 0;
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
  }
  
  .nz-nav-list a:hover {
    background: var(--brand-light);
    padding-left: 0.8rem;
  }
}

/* Hero section */
.nz-hero {
  --overlay: linear-gradient(180deg, rgba(248, 250, 252, 0.85), rgba(248, 250, 252, 0.95));
  background: var(--overlay), var(--hero) center/cover no-repeat;
  color: var(--ink);
  position: relative;
  overflow: hidden;
}

.nz-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(24, 169, 153, 0.1) 0%, rgba(92, 224, 216, 0.05) 100%);
  animation: heroGradient 15s ease infinite;
  pointer-events: none;
}

@keyframes heroGradient {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
}

.nz-hero .nz-hero-inner {
  padding: 72px 20px 64px 20px;
  position: relative;
  z-index: 1;
}

@media (max-width: 599px) {
  .nz-hero .nz-hero-inner {
    padding: 44px 20px;
  }
}

@media (max-width: 420px) {
  .nz-hero .nz-hero-inner {
    padding: 56px 20px 40px 20px;
  }
}

.nz-cta-group {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* Buttons */
.nz-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.2rem;
  border-radius: 12px;
  border: 1px solid transparent;
  text-decoration: none;
  color: var(--ink);
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.nz-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.nz-btn:hover::before {
  width: 300px;
  height: 300px;
}

.nz-btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  border: 0;
  box-shadow: 0 4px 12px rgba(24, 169, 153, 0.3);
}

.nz-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(24, 169, 153, 0.4);
}

.nz-btn-secondary {
  background: var(--bg-secondary);
  color: var(--ink);
  border: 1px solid var(--border);
  box-shadow: 0 2px 4px var(--shadow);
}

.nz-btn-secondary:hover {
  background: var(--brand-light);
  border-color: var(--brand);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--shadow);
}

.nz-btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink);
}

.nz-btn-ghost:hover {
  background: var(--brand-light);
  border-color: var(--brand);
}

/* Sections */
.nz-section {
  padding: 44px 0;
  position: relative;
  z-index: 1;
}

@media (max-width: 599px) {
  .nz-section {
    padding: 28px 0;
  }
}

.nz-section > .nz-wrap > * + * {
  margin-top: 0.8rem;
}

@media (min-width: 920px) {
  .nz-section > .nz-wrap > * + * {
    margin-top: 1rem;
  }
}

.nz-grid {
  display: grid;
  gap: 24px;
}

.nz-grid-2 {
  grid-template-columns: 1fr;
}

@media (min-width: 920px) {
  .nz-grid-2 {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}

.nz-media {
  margin: 0;
}

.nz-media img {
  width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.nz-media img:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-lg);
}

/* Card grid */
.nz-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

@media (max-width: 599px) {
  .nz-card-grid {
    gap: 20px;
  }
}

.nz-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px var(--shadow);
}

.nz-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-lg);
  border-color: var(--brand);
}

.nz-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.nz-card:hover img {
  transform: scale(1.05);
}

@media (max-width: 599px) {
  .nz-card img {
    height: 140px;
  }
}

.nz-card-body {
  padding: 14px 14px 16px;
}

.nz-card h3 {
  margin: 0.1rem 0 0.3rem;
  font-size: 1.05rem;
  color: var(--ink);
}

.nz-card p {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.nz-bullets {
  margin: 0;
  padding-left: 1rem;
  color: var(--muted);
}

.nz-bullets li {
  margin: 0.25rem 0;
}

/* Footer */
.nz-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: 30px 0;
  position: relative;
  z-index: 1;
  box-shadow: 0 -2px 8px var(--shadow);
}

.nz-footer-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

@media (min-width: 920px) {
  .nz-footer-grid {
    grid-template-columns: 1fr auto;
  }
}

.nz-footer-title {
  margin: 0 0 0.4rem;
  color: var(--ink);
}

.nz-footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.25rem;
}

.nz-footer a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s;
}

.nz-footer a:hover {
  color: var(--brand);
  text-decoration: underline;
}

.nz-copy {
  text-align: center;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Page specific banners */
.nz-page-hero {
  background: linear-gradient(180deg, rgba(248, 250, 252, 0.9), rgba(248, 250, 252, 0.98)), var(--bg-img) center/cover no-repeat;
  color: var(--ink);
  position: relative;
  overflow: hidden;
}

.nz-page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(24, 169, 153, 0.08) 0%, rgba(92, 224, 216, 0.05) 100%);
  animation: heroGradient 15s ease infinite;
  pointer-events: none;
}

.nz-page-hero .nz-wrap {
  padding: 56px 20px;
  position: relative;
  z-index: 1;
}

@media (max-width: 599px) {
  .nz-page-hero .nz-wrap {
    padding: 36px 20px;
  }
}

.nz-prose {
  color: var(--ink);
}

.nz-prose h2,
.nz-prose h3 {
  margin: 1.2rem 0 0.4rem;
  color: var(--ink);
}

.nz-prose p {
  margin: 0.6rem 0;
  color: var(--muted);
}

.nz-list {
  padding-left: 1.1rem;
  color: var(--muted);
}

.nz-list li {
  margin: 0.35rem 0;
}

/* Prevent body scroll when mobile nav is open */
body.nz-body.no-scroll {
  overflow: hidden;
}

/* Contact form */
.nz-form {
  max-width: 600px;
  margin: 32px 0;
}

.nz-form-group {
  margin: 0 0 20px;
}

.nz-form-group label {
  display: block;
  margin: 0 0 6px;
  font-weight: 500;
  color: var(--ink);
}

.nz-form-group input,
.nz-form-group textarea {
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--ink);
  font: inherit;
  transition: all 0.2s ease;
}

.nz-form-group input:focus,
.nz-form-group textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(24, 169, 153, 0.1);
}

.nz-form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.nz-error {
  display: block;
  margin: 4px 0 0;
  color: var(--danger);
  font-size: 0.875rem;
}

.nz-form-group input:invalid:not(:placeholder-shown),
.nz-form-group textarea:invalid:not(:placeholder-shown) {
  border-color: var(--danger);
}

.nz-btn-submit {
  margin-top: 8px;
  min-width: 160px;
}

/* Success popup */
.nz-popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
}

.nz-popup.show {
  opacity: 1;
  visibility: visible;
}

.nz-popup-content {
  background: var(--bg-secondary);
  border-radius: 20px;
  padding: 32px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  transform: scale(0.8) translateY(20px);
  transition: transform 0.3s ease;
  position: relative;
  overflow: hidden;
}

.nz-popup.show .nz-popup-content {
  transform: scale(1) translateY(0);
}

.nz-popup-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
}

.nz-popup-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: popupIconScale 0.5s ease;
}

@keyframes popupIconScale {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

.nz-popup-icon svg {
  width: 32px;
  height: 32px;
  fill: white;
}

.nz-popup h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 1.5rem;
}

.nz-popup p {
  margin: 0 0 24px;
  color: var(--muted);
}

.nz-popup-btn {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: white;
  border: none;
  padding: 0.7rem 2rem;
  border-radius: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(24, 169, 153, 0.3);
}

.nz-popup-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(24, 169, 153, 0.4);
}

/* Disclaimer section */
.nz-disclaimer {
  background: var(--brand-light);
  border-radius: 16px;
  padding: 24px;
  margin: 32px 0;
  border: 1px solid rgba(24, 169, 153, 0.2);
}

.nz-disclaimer h2 {
  color: var(--ink);
  margin-bottom: 12px;
}

/* Quiz section */
.nz-quiz {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin: 24px 0;
  box-shadow: 0 2px 8px var(--shadow);
}

.nz-quiz-question {
  margin-bottom: 16px;
  color: var(--ink);
}

.nz-quiz-options {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
}

.nz-quiz-options li {
  margin: 8px 0;
  padding: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nz-quiz-options li:hover {
  background: var(--brand-light);
  border-color: var(--brand);
  transform: translateX(4px);
}

.nz-quiz-answer {
  margin-top: 12px;
  padding: 12px;
  background: var(--brand-light);
  border-left: 4px solid var(--brand);
  border-radius: 8px;
  color: var(--ink);
  font-weight: 500;
}

/* Responsive adjustments */
@media (max-width: 599px) {
  .nz-popup-content {
    padding: 24px;
  }
  
  .nz-popup-icon {
    width: 48px;
    height: 48px;
  }
  
  .nz-popup-icon svg {
    width: 24px;
    height: 24px;
  }
  
  .nz-popup h3 {
    font-size: 1.25rem;
  }
}