/* Harness landing — dark by default, light fallback. Mint accent.
   Tokens mirror HarnessDesign/DesignSystem/Colors.swift (dark variants).
   Theme resolution: explicit [data-theme] wins, otherwise prefers-color-scheme. */

:root {
  --bg:        #0E0F12;
  --bg-2:      #16181C;
  --bg-3:      #1C1E23;
  --panel:     #16181C;
  --elevated:  #21242B;
  --text:      #E8E8EA;
  --text-2:    #B6B8BD;
  --text-3:    #8A8B90;
  --accent:    #3DDC97;
  --accent-2:  #6BE5B0;
  --accent-fg: #06140E;
  --accent-soft: rgba(61, 220, 151, 0.10);
  --border:    rgba(255, 255, 255, 0.08);
  --border-2:  rgba(255, 255, 255, 0.04);

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;
  --gap:       1.5rem;
  --wrap:      min(1180px, 100% - 2.5rem);

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;

  --topbar-bg: rgba(14, 15, 18, 0.78);
}

/* Light theme — applied when system prefers light AND user hasn't overridden,
   or when [data-theme="light"] is explicitly set. */
:root[data-theme="light"] {
  --bg:        #F4F4F5;
  --bg-2:      #ECECEE;
  --bg-3:      #FAFAFA;
  --panel:     #FFFFFF;
  --elevated:  #FFFFFF;
  --text:      #18181B;
  --text-2:    #404045;
  --text-3:    #6A6B70;
  --accent:    #12936A;
  --accent-2:  #0E7B5A;
  --accent-fg: #FFFFFF;
  --accent-soft: rgba(18, 147, 106, 0.10);
  --border:    rgba(0, 0, 0, 0.08);
  --border-2:  rgba(0, 0, 0, 0.04);
  --topbar-bg: rgba(244, 244, 245, 0.78);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg:        #F4F4F5;
    --bg-2:      #ECECEE;
    --bg-3:      #FAFAFA;
    --panel:     #FFFFFF;
    --elevated:  #FFFFFF;
    --text:      #18181B;
    --text-2:    #404045;
    --text-3:    #6A6B70;
    --accent:    #12936A;
    --accent-2:  #0E7B5A;
    --accent-fg: #FFFFFF;
    --accent-soft: rgba(18, 147, 106, 0.10);
    --border:    rgba(0, 0, 0, 0.08);
    --border-2:  rgba(0, 0, 0, 0.04);
    --topbar-bg: rgba(244, 244, 245, 0.78);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); text-decoration: underline; text-underline-offset: 3px; }

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bg-2);
  padding: 0.12em 0.38em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.wrap { width: var(--wrap); margin-inline: auto; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-fg);
  padding: 0.5rem 0.75rem; border-radius: var(--radius-sm);
}
.skip:focus { left: 1rem; top: 1rem; z-index: 100; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--topbar-bg);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border-2);
}
.topbar-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 0;
  gap: 1rem;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.55rem;
  color: var(--text); font-weight: 600; letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; color: var(--text); }
.brand img { border-radius: 7px; display: block; }
.nav { display: flex; gap: 1.25rem; flex-wrap: wrap; align-items: center; }
.nav a { color: var(--text-2); font-size: 0.95rem; }
.nav a:hover { color: var(--text); text-decoration: none; }

/* Theme toggle */
.theme-toggle {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color 120ms ease, border-color 120ms ease, background-color 120ms ease;
}
.theme-toggle:hover { color: var(--text); border-color: var(--accent); }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun  { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* Hero */
.hero { padding: 4.5rem 0 3rem; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: 3.5rem;
  align-items: center;
}
.hero-copy { min-width: 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.85rem; color: var(--text-3);
  text-transform: uppercase; letter-spacing: 0.08em;
  margin: 0 0 0.9rem;
}
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
h1 {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  line-height: 1.08; letter-spacing: -0.02em;
  margin: 0 0 1rem;
  font-weight: 700;
}
.lede {
  font-size: 1.12rem; color: var(--text-2);
  margin: 0 0 1.5rem; max-width: 56ch;
}
.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1.25rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.7rem 1.1rem;
  font-weight: 600; font-size: 0.98rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 80ms ease, background-color 120ms ease, border-color 120ms ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--accent); color: var(--accent-fg);
}
.btn-primary:hover { background: var(--accent-2); color: var(--accent-fg); }
.btn-ghost {
  color: var(--text); background: var(--panel);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--elevated); color: var(--text); }
.meta { color: var(--text-3); font-size: 0.88rem; margin: 0; }
.meta code { background: transparent; border: none; padding: 0; color: var(--accent); }

/* Hero artwork — single screenshot, full bleed */
.hero-art .pic {
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  background: var(--panel);
}
.hero-art .pic img { width: 100%; height: auto; display: block; }

/* Bands */
.band { padding: 4rem 0; border-top: 1px solid var(--border-2); }
.band-alt { background: var(--bg-2); }
.band h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  letter-spacing: -0.015em;
  margin: 0 0 0.5rem;
  font-weight: 700;
}
.band .sub {
  color: var(--text-2); max-width: 64ch;
  margin: 0 0 2rem;
}
.h3-tight { margin-top: 2rem; margin-bottom: 0.5rem; font-size: 1.05rem; letter-spacing: -0.005em; }

/* Trust strip */
.trust {
  background: var(--bg-2);
  border-top: 1px solid var(--border-2);
  border-bottom: 1px solid var(--border-2);
}
.trust ul {
  list-style: none; margin: 0; padding: 0.9rem 0;
  display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-2);
}
.trust li { display: inline-flex; align-items: center; gap: 0.45rem; }
.trust li::before {
  content: "";
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
}
.trust li:first-child::before { display: none; }

/* "What Harness does" prose section */
.what p {
  font-size: 1.1rem;
  color: var(--text-2);
  max-width: 64ch;
  margin: 0;
}
.what em { color: var(--text); font-style: normal; font-weight: 600; }

/* Cards (used in §4 platforms + §6 why-grid) */
.cards {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--elevated);
  border: 1px solid var(--border);
  transition: border-color 140ms ease, transform 140ms ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 0 0 0.5rem; font-size: 1.08rem; letter-spacing: -0.01em; }
.card p  { margin: 0; color: var(--text-2); font-size: 0.97rem; }

/* Platform cards include a screenshot at top */
.platform-card { padding: 0; overflow: hidden; }
.platform-card .pic {
  display: block;
  border-bottom: 1px solid var(--border-2);
  background: var(--bg-2);
}
.platform-card .pic img { width: 100%; height: auto; display: block; }
.platform-card .platform-body { padding: 1.25rem 1.4rem 1.4rem; }
.platform-card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.platform-card p  { margin: 0; color: var(--text-2); font-size: 0.95rem; }

/* Alternating feature blocks (§5) */
.feature {
  border-top: 1px solid var(--border-2);
  padding: 4.5rem 0;
}
.feature-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 3rem;
  align-items: center;
}
.feature.alt .feature-grid {
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
}
.feature.alt .feature-copy { order: 2; }
.feature.alt .feature-art  { order: 1; }
.feature h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.85rem);
  letter-spacing: -0.015em;
  margin: 0 0 0.5rem;
  font-weight: 700;
}
.feature .eyebrow { margin-bottom: 0.7rem; }
.feature p { color: var(--text-2); margin: 0 0 1rem; max-width: 52ch; }
.feature .feature-bullets {
  list-style: none; padding: 0; margin: 1rem 0 0;
  font-size: 0.95rem;
}
.feature .feature-bullets li {
  padding: 0.35rem 0 0.35rem 1.4rem;
  position: relative;
  color: var(--text-2);
}
.feature .feature-bullets li::before {
  content: "";
  position: absolute; left: 0; top: 0.85rem;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}
.feature-art {
  position: relative;
}
.feature-art .pic {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: 0 22px 44px rgba(0, 0, 0, 0.32);
  overflow: hidden;
  background: var(--panel);
  display: block;
}
.feature-art .pic img { width: 100%; height: auto; display: block; }

/* Code block */
.code {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--text);
}
.code code { background: transparent; border: none; padding: 0; font-size: inherit; }

.cta-inline { color: var(--text-2); margin-top: 1.5rem; }

/* Get-started screenshot */
.get-started-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}
.get-started-grid .pic {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.28);
  overflow: hidden;
  display: block;
  background: var(--panel);
}
.get-started-grid .pic img { width: 100%; height: auto; display: block; }
.bullets {
  margin: 0 0 1.25rem; padding-left: 1.2rem;
  color: var(--text-2);
}
.bullets li { margin-bottom: 0.5rem; }
.bullets strong { color: var(--text); }

/* FAQ */
.faq-list { display: grid; gap: 0.6rem; max-width: 80ch; margin-top: 1.5rem; }
.faq-list details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 0;
  transition: border-color 140ms ease;
}
.faq-list details[open] { border-color: var(--accent); }
.faq-list summary {
  list-style: none;
  cursor: pointer;
  padding: 0.95rem 1.1rem;
  font-weight: 600;
  color: var(--text);
  position: relative;
  padding-right: 2.5rem;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem; top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text-3);
  line-height: 1;
}
.faq-list details[open] summary::after { content: "−"; color: var(--accent); }
.faq-list details > div {
  padding: 0 1.1rem 1.1rem;
  color: var(--text-2);
  font-size: 0.97rem;
}
.faq-list details > div p { margin: 0 0 0.6rem; }
.faq-list details > div p:last-child { margin-bottom: 0; }

/* Footer */
.footer {
  border-top: 1px solid var(--border-2);
  padding: 2.25rem 0;
  background: var(--bg);
}
.footer-row {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 0.75rem;
  color: var(--text-3); font-size: 0.9rem;
}
.footer a { color: var(--text-2); }
.footer a:hover { color: var(--text); text-decoration: underline; }
.footer-meta code { background: transparent; border: none; padding: 0; color: var(--accent); }

/* Responsive */
@media (max-width: 960px) {
  .hero-grid,
  .feature-grid,
  .feature.alt .feature-grid,
  .get-started-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .feature.alt .feature-copy { order: 1; }
  .feature.alt .feature-art  { order: 2; }
}

@media (max-width: 720px) {
  .hero { padding: 3rem 0 1.5rem; }
  .feature { padding: 3rem 0; }
  .nav { gap: 0.9rem; }
  .nav a { font-size: 0.9rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}