/* -----------------------------------------
   Design Tokens -- Light Mode (default)
   ----------------------------------------- */
:root {
  /* Colors */
  --color-primary:       #1c1917;
  --color-primary-light: #44403c;
  --color-primary-dark:  #0c0a09;
  --color-accent:        #1c1917;

  --color-bg:            #ffffff;
  --color-bg-alt:        #fafaf9;
  --color-text:          #1c1917;
  --color-text-muted:    #78716c;
  --color-border:        rgba(0, 0, 0, 0.08);

  /* Typography */
  --font-heading: 'Lora', Georgia, 'Times New Roman', serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;

  /* Layout */
  --max-width: 540px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.06), 0 2px 6px rgba(0,0,0,0.04);

  /* Standard Tokens */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --radius-default: 4px;
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full: 9999px;
  --shadow-lg:  0 10px 30px rgba(0,0,0,0.12);
  --shadow-xl:  0 20px 40px rgba(0,0,0,0.15);

  /* Dark mode semantic vars -- light values */
  --dm-bg:             #ffffff;
  --dm-bg-alt:         #fafaf9;
  --dm-heading:        #1c1917;
  --dm-body:           #44403c;
  --dm-muted:          #78716c;
  --dm-subtle:         #a8a29e;
  --dm-border:         rgba(0,0,0,0.07);
  --dm-divider:        rgba(0,0,0,0.10);
  --dm-nav-bg:         rgba(255,255,255,0.92);
  --dm-nav-border:     rgba(0,0,0,0.07);
  --dm-btn-bg:         #1c1917;
  --dm-btn-text:       #ffffff;
  --dm-btn-login-bg:   #f5f5f4;
  --dm-btn-login-text: #78716c;
  --dm-avatar:         #e7e5e4;
  --dm-pull-border:    rgba(0,0,0,0.10);
  --dm-faq-border:     rgba(0,0,0,0.07);
  --dm-logo-filter:    none;
  --dm-mobile-bg:      #ffffff;
  --dm-footer-border:  rgba(0,0,0,0.07);
  --dm-vsl-bg:         #18181a;
  --dm-vsl-border:     rgba(0,0,0,0.10);
}

/* -----------------------------------------
   Dark Mode -- system preference
   ----------------------------------------- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary:       #e7e5e4;
    --color-primary-light: #d6d3d1;
    --color-primary-dark:  #f5f5f4;
    --color-accent:        #e7e5e4;

    --color-bg:            #111110;
    --color-bg-alt:        #18181a;
    --color-text:          #e7e5e4;
    --color-text-muted:    #a8a29e;
    --color-border:        rgba(255,255,255,0.08);

    --dm-bg:             #111110;
    --dm-bg-alt:         #18181a;
    --dm-heading:        #f5f5f4;
    --dm-body:           #d6d3d1;
    --dm-muted:          #a8a29e;
    --dm-subtle:         #78716c;
    --dm-border:         rgba(255,255,255,0.08);
    --dm-divider:        rgba(255,255,255,0.10);
    --dm-nav-bg:         rgba(17,17,16,0.92);
    --dm-nav-border:     rgba(255,255,255,0.07);
    --dm-btn-bg:         #e7e5e4;
    --dm-btn-text:       #111110;
    --dm-btn-login-bg:   #222220;
    --dm-btn-login-text: #78716c;
    --dm-avatar:         #292524;
    --dm-pull-border:    rgba(255,255,255,0.12);
    --dm-faq-border:     rgba(255,255,255,0.07);
    --dm-logo-filter:    none;
    --dm-mobile-bg:      #111110;
    --dm-footer-border:  rgba(255,255,255,0.07);
    --dm-vsl-bg:         #0e0e0d;
    --dm-vsl-border:     rgba(255,255,255,0.07);
  }
}

/* -----------------------------------------
   Base
   ----------------------------------------- */
html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--dm-bg);
  color: var(--dm-body);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* -----------------------------------------
   Dark-mode semantic helpers
   ----------------------------------------- */
.dark-heading { color: var(--dm-heading); }
.dark-body    { color: var(--dm-body); }
.dark-muted   { color: var(--dm-muted); }
.dark-subtle  { color: var(--dm-subtle); }
.dark-avatar  { background-color: var(--dm-avatar); }

/* -----------------------------------------
   Navigation
   ----------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10000;
  background-color: var(--dm-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}

.site-header.is-scrolled {
  border-color: var(--dm-nav-border);
  box-shadow: 0 1px 12px rgba(0,0,0,0.08);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  text-decoration: none;
  flex-shrink: 0;
}

/* Logo -- no filter in any mode */
.zeus-logo {
  height: 28px;
  width: auto;
  display: block;
  filter: none;
}

.nav-desktop {
  display: none;
}

.nav-toggle {
  display: none;
}

/* Login / CTA button */
.nav-cta {
  display: inline-block;
  padding: 7px 18px;
  border-radius: 8px;
  background-color: var(--dm-btn-login-bg);
  color: var(--dm-btn-login-text);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.2s ease, background-color 0.3s ease, color 0.3s ease;
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 0.01em;
}

.nav-cta:hover {
  opacity: 0.72;
}

/* -----------------------------------------
   Mobile Menu (not used on this site)
   ----------------------------------------- */
.mobile-menu {
  display: none;
}

/* -----------------------------------------
   Icons
   ----------------------------------------- */
.icon {
  display: inline-block;
  width: 1.25em;
  height: 1.25em;
  vertical-align: -0.15em;
  flex-shrink: 0;
}

.icon.hidden { display: none; }
.icon-sm { width: 1em; height: 1em; }
.icon-lg { width: 1.5em; height: 1.5em; }
.icon-xl { width: 2em; height: 2em; }

/* -----------------------------------------
   Scroll Reveal
   ----------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal-stagger] > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-reveal-stagger].is-visible > *:nth-child(1)  { transition-delay: 0ms; }
[data-reveal-stagger].is-visible > *:nth-child(2)  { transition-delay: 60ms; }
[data-reveal-stagger].is-visible > *:nth-child(3)  { transition-delay: 120ms; }
[data-reveal-stagger].is-visible > *:nth-child(4)  { transition-delay: 180ms; }
[data-reveal-stagger].is-visible > *:nth-child(5)  { transition-delay: 240ms; }
[data-reveal-stagger].is-visible > *:nth-child(6)  { transition-delay: 300ms; }
[data-reveal-stagger].is-visible > *:nth-child(7)  { transition-delay: 360ms; }
[data-reveal-stagger].is-visible > *:nth-child(8)  { transition-delay: 420ms; }
[data-reveal-stagger].is-visible > *:nth-child(9)  { transition-delay: 480ms; }
[data-reveal-stagger].is-visible > *:nth-child(10) { transition-delay: 540ms; }
[data-reveal-stagger].is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* -----------------------------------------
   Thin Divider
   ----------------------------------------- */
.divider-rule {
  width: 72px;
  height: 1.5px;
  background-color: var(--dm-divider);
  margin-left: auto;
  margin-right: auto;
  transition: background-color 0.3s ease;
}

/* -----------------------------------------
   Prose Body Links
   ----------------------------------------- */
.prose-link {
  font-weight: 500;
  color: var(--dm-body);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--dm-subtle);
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

.prose-link:hover {
  color: var(--dm-heading);
  text-decoration-color: var(--dm-body);
}

/* -----------------------------------------
   Pull Quote
   ----------------------------------------- */
.pull-quote {
  padding-left: 1.5rem;
  border-left: 1.5px solid var(--dm-pull-border);
  margin: 0;
  transition: border-color 0.3s ease;
}

/* -----------------------------------------
   FAQ Accordion
   ----------------------------------------- */
.faq-item {
  border-bottom: 1px solid var(--dm-faq-border);
  padding: 1.25rem 0;
  transition: border-color 0.3s ease;
}

.faq-question {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  background: transparent;
  border: none;
  text-align: left;
  width: 100%;
  padding: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--dm-heading);
  line-height: 1.5;
  transition: color 0.15s ease;
}

.faq-question:hover {
  opacity: 0.8;
}

.faq-answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.3s ease,
              padding 0.3s ease;
  opacity: 0;
  font-size: 1rem;
  line-height: 1.72;
  color: var(--dm-muted);
}

.faq-item.is-open .faq-answer {
  max-height: 400px;
  opacity: 1;
  padding-top: 0.75rem;
}

.faq-icon {
  flex-shrink: 0;
  color: var(--dm-subtle);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), color 0.3s ease;
  margin-top: 2px;
  font-size: 1.25rem;
  line-height: 1;
  font-weight: 300;
  font-family: var(--font-body);
  width: 20px;
  text-align: center;
}

.faq-item.is-open .faq-icon {
  transform: rotate(45deg);
}

/* -----------------------------------------
   Pill Button
   ----------------------------------------- */
.btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 999px;
  background-color: var(--dm-btn-bg);
  color: var(--dm-btn-text);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: opacity 0.2s ease, transform 0.2s ease,
              background-color 0.3s ease, color 0.3s ease;
  line-height: 1;
}

.btn-pill:hover {
  opacity: 0.82;
  transform: translateY(-1px);
}

.btn-pill:active {
  transform: translateY(0);
}

/* -----------------------------------------
   VSL Video Block
   ----------------------------------------- */
.vsl-wrap {
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  background-color: var(--dm-vsl-bg);
  border: 1px solid var(--dm-vsl-border);
  aspect-ratio: 16 / 9;
  position: relative;
  cursor: pointer;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.vsl-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.vsl-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.vsl-play-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--dm-btn-bg);
  color: var(--dm-btn-text);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.25s cubic-bezier(0.16,1,0.3,1), opacity 0.2s ease,
              background-color 0.3s ease, color 0.3s ease;
}

.vsl-wrap:hover .vsl-play-btn {
  transform: scale(1.08);
  opacity: 0.88;
}

/* -----------------------------------------
   Features grid -- responsive
   ----------------------------------------- */
@media (max-width: 520px) {
  .features-grid-2col {
    grid-template-columns: 1fr !important;
  }

  .nav-inner {
    padding: 12px 20px;
  }
}

/* -----------------------------------------
   Footer
   ----------------------------------------- */
footer {
  border-top-color: var(--dm-footer-border) !important;
}

/* -----------------------------------------
   Reduced Motion
   ----------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}