:root {
  --color-primary: #1a2332;
  --color-accent: #00c853;
  --color-accent-hover: #00b248;
  --color-bg: #fafbfc;
  --color-surface: #ffffff;
  --color-text: #1a2332;
  --color-text-secondary: #4a5568;
  --color-border: #e2e7ed;
  --color-accent-tint: #e6fbe9;

  --font-body: "Outfit", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --size-h1: 42px;
  --weight-h1: 426;
  --size-h2: 30px;
  --weight-h2: 431;
  --size-body: 19px;
  --weight-body: 295;

  --max-width: 1120px;
  --spacing-section: 120px;
  --radius: 8px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--size-body);
  font-weight: var(--weight-body);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

h1, h2, h3 {
  line-height: 1.3;
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--size-h1);
  font-weight: var(--weight-h1);
}

h2 {
  font-size: var(--size-h2);
  font-weight: var(--weight-h2);
}

h3 {
  font-size: var(--size-body);
  font-weight: var(--weight-h2);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-hover);
}

img {
  max-width: 100%;
  height: auto;
}

/* Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo img {
  display: block;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-weight: 400;
  font-size: 16px;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
}

.nav-cta {
  display: inline-block;
  padding: 10px 20px;
  background: var(--color-accent);
  color: var(--color-surface) !important;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 15px;
  transition: background 0.2s ease, transform 0.1s ease;
}

.nav-cta:hover {
  background: var(--color-accent-hover);
  color: var(--color-surface) !important;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Sections */
.section {
  padding: var(--spacing-section) 24px;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section--alt {
  background: var(--color-surface);
}

/* Hero */
.hero {
  padding: 100px 24px 80px;
  text-align: center;
  background: linear-gradient(135deg, var(--color-accent-tint), #f6fbfe, var(--color-accent-tint));
  background-size: 300% 100%;
  animation: hero-drift 20s ease-in-out infinite;
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 1s ease, transform 1s ease;
}

h2.reveal,
.card.reveal,
.step.reveal {
  transform: translateY(20px);
  transition: opacity 1.4s ease, transform 1.4s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.section--brand {
  background: linear-gradient(135deg, var(--color-accent-tint), #f6fbfe, var(--color-accent-tint));
  background-size: 300% 100%;
  animation: hero-drift 20s ease-in-out infinite;
}

@keyframes hero-drift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

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

.hero h1 {
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 20px;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: inline-block;
  padding: 14px 32px;
  background: var(--color-accent);
  color: var(--color-surface) !important;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 17px;
  transition: background 0.2s ease, transform 0.15s ease;
}

.hero-cta:hover {
  background: var(--color-accent-hover);
  color: var(--color-surface) !important;
  transform: translateY(-2px);
}

.hero-code {
  margin-top: 48px;
  background: var(--color-primary);
  border-radius: 12px;
  padding: 24px 28px;
  text-align: left;
  overflow-x: auto;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero-code pre {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: #e2e8f0;
  margin: 0;
}

.hero-code .code-key {
  color: #7dd3fc;
}

.hero-code .code-string {
  color: #86efac;
}

.hero-code .code-comment {
  color: #64748b;
}

/* Problem Section */
.section-heading {
  text-align: center;
  margin-bottom: 56px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px;
  transition: box-shadow 0.2s ease, transform 0.15s ease;
}

.card:hover {
  box-shadow: 0 4px 24px rgba(26, 35, 50, 0.06);
  transform: translateY(-2px);
}

.card-icon {
  display: block;
  margin-bottom: 0.75rem;
  color: #e65100;
}

.card-icon--success {
  color: var(--color-accent);
}

.card h3 {
  margin-bottom: 12px;
  color: var(--color-text);
}

.card p {
  color: var(--color-text-secondary);
  font-size: 17px;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  counter-reset: step;
}

.step {
  text-align: center;
  counter-increment: step;
}

.step::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: var(--weight-heading);
  font-size: 20px;
  margin-bottom: 16px;
}

.step h3 {
  margin-bottom: 8px;
}

.step p {
  color: var(--color-text-secondary);
  font-size: 17px;
}

/* CTA Section */
.cta-section {
  text-align: center;
  background:
    linear-gradient(180deg, var(--color-bg) 0%, var(--color-accent-tint) 100%);
  padding: var(--spacing-section) 24px;
}

.cta-section h2 {
  margin-bottom: 12px;
}

.cta-section .section-sub {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  font-size: 18px;
}

/* Forms */
.form-inline {
  display: flex;
  gap: 12px;
  max-width: 440px;
  margin: 0 auto;
}

.form-inline input[type="email"] {
  flex: 1;
  padding: 14px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  outline: none;
  transition: border-color 0.2s ease;
}

.form-inline input[type="email"]:focus {
  border-color: var(--color-accent);
}

.form-inline button,
.form-button {
  padding: 14px 24px;
  background: var(--color-accent);
  color: var(--color-surface);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.1s ease;
}

.form-inline button:hover,
.form-button:hover {
  background: var(--color-accent-hover);
  color: var(--color-surface);
  transform: translateY(-1px);
}

.form-note {
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Contact Form */
.contact-form {
  max-width: 560px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 500;
  font-size: 15px;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  outline: none;
  transition: border-color 0.2s ease;
  background: var(--color-surface);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 24px;
  background: var(--color-surface);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-brand p {
  color: var(--color-text-secondary);
  font-size: 15px;
  margin-top: 8px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 15px;
}

.footer-links a:hover {
  color: var(--color-text);
}

.footer-copyright {
  width: 100%;
  text-align: center;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

/* Page Headers */
.page-header {
  text-align: center;
  padding: 80px 24px 48px;
}

.page-header h1 {
  margin-bottom: 12px;
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: 19px;
  max-width: 520px;
  margin: 0 auto;
}

/* Prose */
.prose {
  max-width: 640px;
  margin: 0 auto;
}

.prose h2 {
  margin-top: 40px;
  margin-bottom: 12px;
}

.prose p {
  margin-bottom: 16px;
  color: var(--color-text-secondary);
}

.prose a {
  color: var(--color-accent);
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --spacing-section: 80px;
  }

  h1 {
    font-size: 27px;
  }

  h2 {
    font-size: 20px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    padding: 24px;
    flex-direction: column;
    gap: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-cta {
    order: 1;
    margin-left: auto;
    margin-right: 12px;
  }

  .nav-toggle {
    order: 2;
  }

  .form-inline {
    flex-direction: column;
  }

  .hero {
    padding: 60px 24px 48px;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }
}