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

:root {
  --color-bg: #f8fafc;
  --color-surface: #fff;
  --color-text: #1e293b;
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --color-primary: #1e3a5f;
  --color-primary-hover: #2c5282;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --font-sans: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --max-width: 48rem;
  --space: 1.5rem;
  --radius: 8px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space);
}

.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;
}

/* Header */
.header {
  padding: 2.5rem 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.tagline {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  color: var(--color-muted);
}

/* Buttons */
.cta {
  display: inline-block;
  padding: 0.65rem 1.35rem;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background-color 0.15s, color 0.15s;
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.cta-primary {
  color: #fff;
  background: var(--color-primary);
}

.cta-primary:hover {
  background: var(--color-primary-hover);
}

.cta-secondary {
  color: var(--color-primary);
  background: transparent;
  border: 1px solid var(--color-primary);
}

.cta-secondary:hover {
  background: var(--color-primary);
  color: #fff;
}

/* Hero */
.hero {
  padding: 2.5rem 0;
}

.hero-text {
  font-size: 1.15rem;
  color: var(--color-muted);
  margin: 0 0 1.5rem;
  max-width: 38rem;
}

.hero .cta {
  margin-bottom: 0.5rem;
}

/* Content preview grid */
.content-preview {
  padding: 2rem 0;
}

.content-preview h2,
.testimonials h2,
.cta-section h2,
.newsletter h2,
.useful-links h2 {
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  margin: 0 0 1.25rem;
}

.preview-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.preview-card {
  padding: 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.preview-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.preview-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.5;
}

/* Testimonials */
.testimonials {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
}

.testimonial {
  margin: 0 0 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.testimonial p {
  margin: 0 0 0.5rem;
  font-style: italic;
  color: var(--color-text);
}

.testimonial cite {
  font-size: 0.9rem;
  color: var(--color-muted);
  font-style: normal;
}

.testimonial-note {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin: 0;
}

/* CTA section */
.cta-section {
  padding: 2.5rem 0;
  background: var(--color-primary);
  color: #fff;
}

.cta-section h2 {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 0.5rem;
}

.cta-section p {
  margin: 0 0 1.25rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 36rem;
}

.cta-section .cta-primary {
  background: #fff;
  color: var(--color-primary);
}

.cta-section .cta-primary:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

/* Newsletter */
.newsletter {
  padding: 2.5rem 0;
  border-top: 1px solid var(--color-border);
}

.newsletter p {
  margin: 0 0 1rem;
  color: var(--color-muted);
}

.newsletter-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  max-width: 24rem;
}

.newsletter-form input {
  flex: 1;
  min-width: 12rem;
  padding: 0.65rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.newsletter-form input:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Useful links */
.useful-links {
  padding: 2rem 0 2.5rem;
}

.links-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.links-list li {
  margin-bottom: 0.5rem;
}

.links-list a {
  color: var(--color-accent);
  text-decoration: none;
}

.links-list a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem;
  color: var(--color-muted);
}

.footer a {
  color: var(--color-accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* Guide page */
.logo-link {
  text-decoration: none;
  color: inherit;
}

.logo-link h1 {
  margin: 0 0 0.25rem;
}

.guide-hero {
  padding: 2rem 0 1.5rem;
}

.guide-title {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 1.25rem;
  color: var(--color-primary);
}

.guide-intro {
  margin: 0 0 0.75rem;
  color: var(--color-text);
}

.guide-note {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.guide-list {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
  line-height: 1.6;
}

.guide-list li {
  margin-bottom: 0.35rem;
}

.guide-content {
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
}

.guide-content h3 {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  margin: 1.25rem 0 0.5rem;
}

.guide-content h3:first-child {
  margin-top: 0;
}

.guide-content p {
  margin: 0 0 0.75rem;
  color: var(--color-text);
}

.guide-cta-section {
  padding: 2.5rem 0;
  background: var(--color-primary);
  color: #fff;
  margin-top: 2rem;
}

.guide-cta-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: #fff;
}

.guide-cta-text {
  margin: 0 0 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.95rem;
}

.guide-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  max-width: 24rem;
}

.guide-form input {
  flex: 1;
  min-width: 12rem;
  padding: 0.65rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.guide-form input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.guide-form .cta-primary {
  background: #fff;
  color: var(--color-primary);
}

.guide-form .cta-primary:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.guide-privacy {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.8);
}

.guide-back {
  padding: 1.5rem 0 2rem;
}

.guide-back a {
  color: var(--color-accent);
  text-decoration: none;
}

.guide-back a:hover {
  text-decoration: underline;
}