:root {
    --color-bg: #ffffff;
    --color-surface: #ffffff;
    --color-surface-muted: #f7f2ea;
    --color-surface-alt: #f7f2ea;
    --color-surface-accent: #1e1e1e;
  
    --color-text: #0a0a0a;
    --color-text-subtle: #717182;
    --color-text-on-dark: #ffffff;
    --color-primary: #d4183d;
    --color-primary-hover: #b81535;
    --color-primary-dark: #70041e;
    --color-primary-very-dark: #490c13;
    --color-border-soft: rgba(0, 0, 0, 0.1);
    --color-border-accent: #d9bea3;
  
    --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Inter", sans-serif;
    --font-display: "Jersey 10", system-ui, sans-serif;
    --font-mono: "Fira Code", ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  
    --radius-sm: 10px;
    --radius-md: 14px;
    --shadow-soft: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.1);
  
    --max-width-page: 1120px;
    --spacing-section-y: 96px;
    --opacity-bg-image: 0.1;
  }
  
  /* Dark theme override (opt-in via data-theme) */
  [data-theme="dark"] {
    --color-bg: #1E1E1E;
    --color-surface: #111118;
    --color-surface-muted: #181820;
    --color-surface-alt: #181820;
    --color-surface-accent: #1E1E1E;
  
    --color-text: #f5f5f7;
    --color-text-subtle: #c3c3d0;
    --color-text-on-dark: #ffffff;
    /* Match primary red to light mode */
    --color-primary: #d4183d;
    --color-primary-hover: #b81535;
    --color-primary-dark: #ffffff;
    --color-primary-very-dark: #490c13;
    --color-border-soft: rgba(255, 255, 255, 0.18);
    --color-border-accent: rgba(255, 221, 194, 0.4);
    --opacity-bg-image: 0.5;
  }
  
  /* Optional: respect system preference if you add this at root level */
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --color-bg: #1E1E1E;
      --color-surface: #111118;
      --color-surface-muted: #181820;
      --color-surface-alt: #181820;
      --color-surface-accent: #1E1E1E;
  
      --color-text: #f5f5f7;
      --color-text-subtle: #c3c3d0;
      --color-text-on-dark: #ffffff;
      --color-primary: #D4183D;
      --color-primary-dark: #ffffff;
      --color-primary-very-dark: #490C13;
      --color-border-soft: rgba(255, 255, 255, 0.18);
      --color-border-accent: rgba(255, 221, 194, 0.4);
    }
  }

  @media (max-width: 768px) {
    .hide-on-mobile {
      display: none;
    }
  }
  
  /* Base layout */
  
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  
  body.page {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-bg);
  }
  
  img {
    max-width: 100%;
    display: block;
  }
  
  a {
    color: inherit;
    text-decoration: none;
  }
  
  main {
    display: flex;
    flex-direction: column;
  }
  
  /* Header */
  
  .site-header {
    border-bottom: 1px solid var(--color-border-soft);
    background-color: var(--color-bg);
  }
  
  .site-header-inner {
    max-width: var(--max-width-page);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }
  
  .brand {
    display: inline-flex;
    align-items: flex-end;
    gap: 8px;
  }
  
  .brand-mark {
    width: 48px;
    height: 48px;
  }
  
  .brand-text {
    display: flex;
    flex-direction: column;
  }
  
  .brand-name {
    font-family: var(--font-display);
    font-size: 40px;
    line-height: 0.7;
    color: var(--color-text-subtle);
  }
  
  .brand-tagline {
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-subtle);
  }
  
  .site-nav {
    display: flex;
    align-items: center;
  gap: 16px;
  }
  
  .nav-link {
    font-size: 14px;
    color: var(--color-text-subtle);
  }

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}
  
  .nav-link-primary {
  padding: 12px 24px;
    border-radius: var(--radius-sm);
    background-color: var(--color-primary);
    color: #fff;
    font-size: 16px;
  transition: background-color 260ms ease, border-color 260ms ease,
    color 260ms ease;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  border: none;
  background-color: transparent;
  padding: 0;
  cursor: pointer;
}

.nav-toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text-subtle);
}

  .theme-toggle {
    width: 44px;
    height: 26px;
    border-radius: 999px;
    border: 1px solid var(--color-border-soft);
    background-color: var(--color-surface-muted);
    padding: 0;
    position: relative;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
    flex: 0 0 auto;
  }

  .theme-toggle:focus-visible {
    outline: 3px solid rgba(212, 24, 61, 0.35);
    outline-offset: 3px;
  }

  .theme-toggle-thumb {
    width: 20px;
    height: 20px;
    border-radius: 999px;
    background-color: var(--color-bg);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
    transform: translateX(3px);
    transition: transform 180ms ease, background-color 180ms ease;
  }

  .theme-toggle[aria-checked="true"] {
    border-color: var(--color-border-accent);
    background-color: #490C13;
  }

  .theme-toggle[aria-checked="true"] .theme-toggle-thumb {
    transform: translateX(21px);
  }
  
  /* Generic sections */
  
  .section {
    padding: var(--spacing-section-y) 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .section-header {
    max-width: 720px;
    text-align: center;
    margin: 0 auto 32px;
  }
  
  .section-header h2 {
    font-family: var(--font-display);
    font-size: 64px;
    line-height: 1;
    color: var(--color-primary-dark);
    margin: 0 0 16px;
  }
  
  .section-header p {
    margin: 0;
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-text-subtle);
  }
  
  /* Hero */
  
  .hero {
    padding-top: 180px;
    padding-bottom: 180px;
    position: relative;
    background-color: var(--color-bg);
  }
  
  .hero-pill {
    padding: 4px 15px;
    border-radius: 999px;
    background-color: rgba(189, 217, 219, 0.5);
    color: var(--color-text-subtle);
    font-size: 14px;
  }
  
  .hero-heading {
    margin-top: 32px;
    text-align: center;
  }
  
  .hero-heading h1 {
    margin: 0;
    font-family: var(--font-display);
    font-size: 96px;
    color: var(--color-primary-dark);
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  
  .hero-subtitle {
    max-width: 760px;
    margin: 24px auto 0;
    text-align: center;
    font-size: 20px;
    line-height: 1.6;
    color: var(--color-text-subtle);
  }

  /* Mobile */
  @media (max-width: 768px) {
    .hero-subtitle {
      font-size: 16px;
    }
  }
  
  .hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
  }
  
  .hero-actions-center {
    justify-content: center;
  }
  
  .hero-made-with {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 16px;
    font-size: 14px;
    color: var(--color-text-subtle);
  }
  
  .hero-heart {
    width: 14px;
    height: 14px;
  }
  
  .hero-illustration-envelope {
    position: absolute;
    left: 5%;
    top: 45%;
    opacity: var(--opacity-bg-image);
    transform: rotate(-20deg);
    pointer-events: none;
  }

  .hero-illustration-diamond {
    position: absolute;
    right: 15%;
    top: 5%;
    opacity: var(--opacity-bg-image);
    transform: rotate(20deg);
    pointer-events: none;
  }

  .hero-illustration-chat {
    position: absolute;
    right: 10%;
    top: 65%;
    opacity: var(--opacity-bg-image);
    transform: rotate(20deg);
    pointer-events: none;
  }

  .problem-section-illustration {
    position: absolute;
    right: 20%;
    top: 75rem;
    opacity: var(--opacity-bg-image);
    transform: rotate(20deg);
    pointer-events: none;
  }

  .api-section-illustration {
    position: absolute;
    left: 35%;
    top: 160rem;
    opacity: var(--opacity-bg-image);
    transform: rotate(20deg);
    pointer-events: none;
  }

  .principles-section-illustration {
    position: absolute;
    left: 10%;
    top: 195rem;
    opacity: var(--opacity-bg-image);
    transform: rotate(-20deg);
    pointer-events: none;
  }

  .audiences-section-illustration {
    position: absolute;
    right: 10%;
    top: 250rem;
    opacity: var(--opacity-bg-image);
    pointer-events: none;
  }

  .get-started-section-illustration {
    position: absolute;
    left: 25%;
    top: 318rem;
    opacity: var(--opacity-bg-image);
    transform: rotate(-20deg);
    pointer-events: none;
  }
  
  /* Buttons */
  
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    text-align: center;
    line-height: 1.5;
    border: 1px solid transparent;
    cursor: pointer;
  transition: background-color 260ms ease, border-color 260ms ease,
    color 260ms ease, transform 260ms ease;
  }
  
  .btn-primary {
    background-color: var(--color-primary);
    color: #fff;
  }

.btn-primary:hover {
  background-color: var(--color-primary-hover);
}
  
  .btn-outline {
    background-color: transparent;
    border-color: var(--color-border-soft);
    color: var(--color-text);
  }

.btn-outline:hover {
  background-color: rgba(0, 0, 0, 0.032);
  border-color: rgba(0, 0, 0, 0.16);
}
  
  .btn-light {
    background-color: #ffffff;
    color: #030213;
  }
  
.btn-light:hover {
  background-color: #f7f7fb;
}

  .btn-outline-light {
    background-color: transparent;
    border-color: #ffffff;
    color: #ffffff;
  }

.btn-outline-light:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: #ffffff;
}
  
  /* Problem / Approach */
  
  .problem {
    background-color: rgba(236, 226, 208, 0.3);
  }
  
  .problem {
    width: 100%;
  }

  .problem-content {
    max-width: var(--max-width-page);
  }

  .approach-card {
    max-width: 520px;
    align-self: flex-start;
    margin-top: 24px;
  }
  
  .problem > .problem-content,
  .problem > .approach-card {
    max-width: var(--max-width-page);
  }
  
  .problem {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 48px;
  }
  
  .problem-content {
    max-width: 480px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  
  .problem-content h2 {
    font-family: var(--font-display);
    font-size: 64px;
    color: var(--color-primary-dark);
    margin: 0;
  }
  
  .problem-content p {
    font-size: 18px;
    color: var(--color-text-subtle);
    line-height: 1.6;
  }
  
  .problem-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .problem-content-inner {
    max-width: 600px;
  }
  
  .problem-list li::before {
    content: "✕";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    margin-right: 8px;
    border-radius: 999px;
    background-color: rgba(212, 24, 61, 0.1);
    color: var(--color-primary);
    font-size: 14px;
  }
  
  .problem-list li {
    font-size: 16px;
    color: var(--color-text-subtle);
  }
  
  /* Approach card */
  
  .approach-card {
    max-width: 420px;
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-accent);
    box-shadow: var(--shadow-soft);
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  
  .approach-card h3 {
    margin: 0;
    font-weight: 600;
    font-size: 20px;
  }
  
  .approach-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  
  .approach-list li {
    position: relative;
    padding-left: 28px;
    font-size: 16px;
    color: var(--color-text);
  }
  
  .approach-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    width: 20px;
    height: 20px;
    background-image: url("../assets/images/checked-icon.svg");
    background-size: contain;
    background-repeat: no-repeat;
  }
  
  /* Capabilities */
  
  .capabilities {
    background-color: var(--color-bg);
  }
  
  .capabilities .section-header {
    margin-bottom: 48px;
  }
  
  .card-grid {
    max-width: var(--max-width-page);
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    justify-content: center;
  }
  
  .card {
    flex: 1 1 280px;
    max-width: 320px;
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid rgba(217, 190, 163, 0.6);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  
  .card-icon img {
    width: 40px;
    height: 40px;
  }
  
  .card h3 {
    margin: 0;
    font-size: 20px;
  }
  
  .card p {
    margin: 0;
    font-size: 16px;
    color: var(--color-text-subtle);
  }
  
  /* Dashboard */
  
  .dashboard {
    background-color: rgba(189, 217, 219, 0.5);
  }
  
  .dashboard-inner {
    max-width: var(--max-width-page);
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: 40px;
    display: flex;
    align-items: center;
  }
  
  .dashboard-content {
    margin-left: 60px;
    flex: 1 1 320px;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  
  .dashboard-content h2 {
    font-family: var(--font-display);
    font-size: 56px;
    line-height: 1;
    color: var(--color-primary-dark);
    margin: 0 0 8px;
  }
  
  .dashboard-content p {
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-text);
    margin: 0;
  }
  
  .dashboard-illustration {
    flex: 1 1 280px;
    max-width: 520px;
    margin: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
  }
  
  @media (max-width: 768px) {
    .dashboard-inner {
      flex-direction: column;
      align-items: center;
    }
  
    .dashboard-content h2 {
      font-size: 40px;
    }

    .dashboard-content {
      margin-left: 10px;
    }
  }
  
  /* API */
  
  .api {
    background-color: rgba(236, 226, 208, 0.3);
  }
  
  .code-block {
  position: relative;
    max-width: 992px;
    width: 100%;
    background-color: var(--color-surface-accent);
    border-radius: var(--radius-md);
    padding: 24px;
    overflow: auto;
  }
  
  .code-block pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    color: #d4d4d4;
  }

.code-copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 3px 8px;
  font-size: 12px;
  border-radius: 6px;
  border: 1px solid rgba(240, 246, 252, 0.12);
  background-color: rgba(13, 17, 23, 0.85);
  color: #c9d1d9;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease-in-out, background-color 0.15s ease-in-out,
    border-color 0.15s ease-in-out;
}

.code-block:hover .code-copy-btn {
  opacity: 1;
}

.code-copy-btn:hover {
  background-color: rgba(22, 27, 34, 0.95);
  border-color: rgba(240, 246, 252, 0.3);
}
  
  /* Principles */
  
  .principles-grid {
    max-width: 784px;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    justify-content: center;
  }
  
  .principle {
    flex: 1 1 320px;
    border-left: 4px solid var(--color-primary);
    padding-left: 28px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  
  .principle h3 {
    margin: 0;
    font-size: 20px;
    color: var(--color-primary-dark);
  }
  
  .principle p {
    margin: 0;
    font-size: 16px;
    color: var(--color-text-subtle);
  }
  
  /* Audiences */
  
  .audiences {
    background-color: rgba(236, 226, 208, 0.3);
  }
  
  .audience-columns {
    max-width: 784px;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
  }
  
  .audience-card {
    flex: 1 1 320px;
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid rgba(217, 190, 163, 0.6);
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  
  .audience-card h3 {
    margin: 0;
    font-size: 20px;
    color: var(--color-text-subtle);
  }
  
  .audience-card ul {
    margin: 0;
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  
  .audience-card li {
    font-size: 16px;
    color: var(--color-text);
  }
  
  /* Get Started */
  
  .get-started .section-header {
    margin-bottom: 32px;
  }
  
  .steps {
    max-width: var(--max-width-page);
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 24px;
  }
  
  .step {
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-soft);
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  
  .step h3 {
    margin: 0;
    font-size: 18px;
  }
  
  .step-code {
    position: relative;
    background-color: rgba(236, 226, 208, 0.3);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    display: inline-flex;
    flex-direction: column;
    gap: 4px;
    font-family: var(--font-mono);
    font-size: 14px;
  }

  .step-code:hover .code-copy-btn {
    opacity: 1;
  }
  
  /* Final CTA */
  
  .final-cta {
    background-color: var(--color-primary-very-dark);
    color: var(--color-text-on-dark);
  }
  
  .final-cta .section-header h2,
  .final-cta .section-header p {
    color: var(--color-text-on-dark);
  }
  
  .final-cta .hero-actions {
    margin-top: 24px;
  }
  
  /* Footer */
  
  .site-footer {
    border-top: 1px solid var(--color-border-soft);
    background-color: var(--color-bg);
  }
  
  .site-footer-inner {
    max-width: var(--max-width-page);
    margin: 0 auto;
    padding: 32px 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
  }
  
  .footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  
  .footer-logo-mark img {
    width: 36px;
    height: 36px;
  }
  
  .footer-brand-name {
    font-family: var(--font-display);
    font-size: 32px;
    color: rgba(113, 113, 130, 0.5);
  }
  
  .footer-nav {
    display: flex;
    align-items: center;
    gap: 24px;
  }
  
  .footer-link {
    font-size: 14px;
    color: var(--color-text-subtle);
  }
  
  .footer-made-with {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--color-text-subtle);
  }
  
  /* Responsive tweaks */
  
  @media (max-width: 960px) {
    .hero-heading h1 {
      font-size: 64px;
    }
  
    .section-header h2 {
      font-size: 48px;
    }
  
  .site-header-inner {
    flex-direction: row;
    align-items: center;
  }

  .site-nav {
    position: relative;
    margin-left: auto;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav-links {
    position: absolute;
    top: 48px;
    right: 0;
    min-width: 220px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-soft);
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    z-index: 20;
  }

  .site-nav.site-nav-open .site-nav-links {
    display: flex;
  }
  
    .hero {
      padding-top: 120px;
      padding-bottom: 120px;
    }
  
    .hero-illustration {
      display: none;
    }
  }
  
  @media (max-width: 640px) {
    .hero-heading h1 {
      font-size: 40px;
    }
  
    .section-header h2 {
      font-size: 36px;
    }
  
    .card,
    .audience-card {
      max-width: 100%;
    }
  
    .steps {
      gap: 16px;
    }
  
    .site-footer-inner {
      flex-direction: column;
      align-items: flex-start;
    }
  }