:root {
  --bg-start: #0A0C12;
  --bg-end: #0F1219;

  --surface-card: #13161F;
  --surface-card-border: #1E2234;
  --surface-accent-border: #252A3A;

  --text-primary: #F0F1F5;
  --text-emphasis: #E8EAF0;
  --text-body: #8890A5;
  --text-muted: #707A98;
  --text-muted-light: #727B9E;

  --accent-teal: #4ECDC4;
  --accent-orange: #FF6B35;
  --accent-blue: #60A5FA;
  --accent-purple: #A78BFA;

  --cta-bg: #4ECDC4;
  --cta-text: #0A0C12;

  --font-sans: 'Instrument Sans', 'DM Sans', system-ui, sans-serif;
}

*,
*::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-sans);
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-body);
  background: var(--bg-start);
  background: linear-gradient(180deg, var(--bg-start), var(--bg-end));
  min-height: 100vh;
}

p {
  margin-bottom: 10px;
}

p:last-child {
  margin-bottom: 0;
}

strong {
  color: var(--text-emphasis);
  font-weight: 700;
}

ul {
  list-style: none;
  padding: 0;
}

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

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--accent-teal);
  outline-offset: 2px;
  border-radius: 3px;
}

h1 {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

h2 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.3px;
  color: var(--text-primary);
  margin-bottom: 16px;
}

h3 {
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-emphasis);
  margin-bottom: 6px;
}

header#hero,
section,
footer {
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

section {
  padding-top: 0;
  padding-bottom: 48px;
}

#personas,
#value-themes {
  max-width: 1000px;
}

header#hero {
  padding-top: 48px;
  padding-bottom: 32px;
}

header#hero p:first-of-type {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-body);
  margin-top: 16px;
}

header#hero p:nth-of-type(2) {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-muted-light);
  margin-top: 10px;
}

header#hero p:last-of-type {
  margin-top: 24px;
}

.cta-button {
  display: inline-block;
  background: var(--cta-bg);
  color: var(--cta-text);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  padding: 12px 24px;
  border-radius: 10px;
  transition: filter 0.15s ease;
}

.cta-button:hover {
  filter: brightness(1.1);
  text-decoration: none;
}

.cta-button:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 3px;
  border-radius: 10px;
}

#personas > h2 {
  max-width: 600px;
}

.persona-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
  margin-bottom: 24px;
}

.persona-grid article {
  background: var(--surface-card);
  border: 1px solid var(--surface-card-border);
  border-left-width: 3px;
  border-radius: 10px;
  padding: 14px 16px;
}

.persona-grid article:nth-child(1) {
  border-left-color: var(--accent-orange);
}

.persona-grid article:nth-child(2) {
  border-left-color: var(--accent-purple);
}

.persona-grid article:nth-child(3) {
  border-left-color: var(--accent-blue);
}

.persona-grid article p {
  font-size: 12px;
  line-height: 1.55;
}

.persona-grid article p + p {
  margin-top: 8px;
  margin-bottom: 0;
}

.persona-grid article em {
  color: var(--text-emphasis);
}

#personas > p:last-child {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-emphasis);
  max-width: 600px;
}

#alternatives p {
  margin-bottom: 16px;
}

#alternatives > p:last-child {
  color: var(--text-emphasis);
  margin-top: 24px;
  margin-bottom: 0;
}

#rubric ul {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

#rubric li {
  padding-left: 16px;
  position: relative;
}

#rubric li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 5px;
  height: 5px;
  background: var(--accent-teal);
  border-radius: 50%;
}

#introduction p {
  line-height: 1.55;
}

#value-themes > h2 {
  max-width: 600px;
}

#value-themes article {
  background: var(--surface-card);
  border: 1px solid var(--surface-card-border);
  border-left-width: 3px;
  border-left-color: var(--accent-teal);
  border-radius: 10px;
  padding: 14px 16px;
  margin-top: 20px;
}

#value-themes article:last-of-type {
  border-left-color: var(--accent-orange);
}

#value-themes article > p {
  margin-bottom: 14px;
}

#value-themes article ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#value-themes article li {
  font-size: 12px;
  line-height: 1.55;
}

#pricing {
  background: linear-gradient(135deg, #4ECDC412 0%, #FF6B3512 100%);
  border: 1px solid var(--surface-accent-border);
  border-radius: 12px;
  padding-top: 24px;
  padding-bottom: 24px;
  margin-bottom: 48px;
}

#pricing > p:first-of-type {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-emphasis);
}

#pricing > p:nth-of-type(2) {
  color: var(--text-muted-light);
  margin-top: 6px;
}

#pricing > p:last-of-type {
  margin-top: 20px;
}

#ask > p:nth-of-type(2) {
  color: var(--text-muted-light);
}

#ask > p:last-of-type {
  margin-top: 24px;
}

footer {
  padding-top: 32px;
  padding-bottom: 48px;
  border-top: 1px solid var(--surface-card-border);
}

footer p {
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-muted);
  margin-bottom: 6px;
}

footer a {
  color: var(--text-muted-light);
}

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

@media (min-width: 768px) {
  h1 {
    font-size: 40px;
  }

  h2 {
    font-size: 26px;
  }

  section {
    padding-top: 0;
    padding-bottom: 80px;
  }

  header#hero {
    padding-top: 96px;
    padding-bottom: 64px;
  }

  header#hero p:first-of-type {
    font-size: 15px;
    margin-top: 20px;
  }

  header#hero p:nth-of-type(2) {
    margin-top: 14px;
  }

  header#hero p:last-of-type {
    margin-top: 32px;
  }

  .cta-button {
    padding: 14px 32px;
  }

  .persona-grid {
    flex-direction: row;
    gap: 20px;
    margin-top: 24px;
    margin-bottom: 32px;
  }

  .persona-grid article {
    flex: 1;
    padding: 16px 20px;
  }

  #value-themes article {
    padding: 20px 24px;
  }

  #pricing {
    padding-top: 32px;
    padding-bottom: 32px;
    margin-bottom: 48px;
  }

  footer {
    padding-top: 48px;
    padding-bottom: 64px;
  }
}