/* Design plan
   Subject: CyberFoil desktop companion — developers + technical teams want a single-task landing: see the app, download it, keep saves local.
   Color: semantic tokens from design-system: base #000000, raised #d63850, strong #121212, text #aaaaaa/#ffffff/#e8e8e8, accents cyan #00d8ee / yellow #ffde59 / lime #b6ff58, border #ffffff.
   Type: --font-primary system-ui for all prose/headlines; --font-mono only for version/build meta. Tight display tracking on headline.
   Layout: hero is the image — left copy + large windowed app preview on right; left-aligned, generous whitespace, no extra cards. One proof strip below.
   Principle: image does the selling; Neo-Brutal is the frame — 3px borders + hard shadows — not the content.
*/
:root {
  --color-text-primary: #aaaaaa;
  --color-text-secondary: #ffffff;
  --color-text-tertiary: #e8e8e8;
  --color-text-inverse: #777777;
  --color-surface-base: #000000;
  --color-surface-raised: #d63850;
  --color-surface-strong: #121212;
  --color-accent-cyan: #00d8ee;
  --color-accent-yellow: #ffde59;
  --color-accent-lime: #b6ff58;
  --color-border: #ffffff;
  --font-primary: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --font-size-xs: 13px;
  --font-size-sm: 13.33px;
  --font-size-md: 15px;
  --font-size-lg: 16px;
  --font-size-xl: 17px;
  --font-size-2xl: 40px;
  --space-1: 5.6px;
  --space-2: 6.4px;
  --space-3: 7.2px;
  --space-4: 8.8px;
  --space-5: 9.6px;
  --space-6: 12.8px;
  --space-7: 16px;
  --space-8: 20px;
  --radius-xs: 3px;
  --radius-sm: 4px;
  --duration-instant: 150ms;
  --border: 3px solid var(--color-border);
  --shadow: 6px 6px 0 var(--color-border);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  margin: 0;
  background: var(--color-surface-base);
  color: var(--color-text-primary);
  font: 400 var(--font-size-xs)/20.15px var(--font-primary);
}
a { color: inherit; }
button { font: inherit; }

.skip-link {
  position: fixed;
  z-index: 10;
  top: 8px;
  left: 8px;
  padding: var(--space-6) var(--space-7);
  transform: translateY(-150%);
  border: var(--border);
  background: var(--color-accent-yellow);
  color: var(--color-surface-base);
  font-weight: 700;
  text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }

.site-header,
.page,
.site-footer { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.site-header {
  display: flex;
  min-height: 82px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  border-bottom: var(--border);
}
.brand { color: var(--color-text-secondary); font-size: var(--font-size-xl); font-weight: 700; letter-spacing: -.04em; text-decoration: none; }
.site-nav { display: flex; gap: var(--space-8); }
.site-nav a { color: var(--color-text-primary); font-size: var(--font-size-sm); text-underline-offset: 5px; }
.site-nav a:hover { color: var(--color-text-secondary); }

/* HERO — hai nút download căn trái, ảnh preview lớn căn phải */
.hero {
  display: grid;
  grid-template-columns: minmax(260px, .72fr) minmax(0, 1.28fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  min-height: 540px;
  padding: 62px 0;
  border-bottom: var(--border);
}
.hero-left {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}
.eyebrow {
  display: inline-block;
  margin: 0 0 var(--space-7);
  padding: var(--space-3) var(--space-5);
  border: 2px solid var(--color-surface-base);
  background: var(--color-accent-lime);
  color: var(--color-surface-base);
  font-size: var(--font-size-xs);
  font-weight: 700;
}
.title {
  max-width: 560px;
  margin: 0;
  color: var(--color-text-secondary);
  font-size: clamp(46px, 5vw, 62px);
  font-weight: 800;
  letter-spacing: -.08em;
  line-height: .88;
}
.lead { max-width: 520px; margin: var(--space-8) 0 0; color: var(--color-text-tertiary); font-size: var(--font-size-md); line-height: 1.6; }
.download-stack {
  display: grid;
  gap: var(--space-7);
  width: min(100%, 420px);
  margin-top: var(--space-8);
  align-self: stretch;
}
.download-area { width: 100%; max-width: 420px; text-align: left; }
.download-button {
  display: grid;
  grid-template-columns: 54px 1fr;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-6);
  border: var(--border);
  border-radius: var(--radius-xs);
  background: var(--color-accent-yellow);
  color: var(--color-surface-base);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: transform var(--duration-instant), box-shadow var(--duration-instant), background var(--duration-instant);
}
.download-button:hover { background: var(--color-accent-lime); transform: translate(4px, 4px); box-shadow: 2px 2px 0 var(--color-border); }
.button-lime { background: var(--color-accent-lime); }
.button-lime:hover { background: var(--color-accent-yellow); }
.download-button:active { transform: translate(6px, 6px); box-shadow: none; }
.download-button:focus-visible { outline: 3px solid var(--color-accent-cyan); outline-offset: 4px; }
.download-icon { display: grid; place-items: center; width: 54px; height: 54px; border: 2px solid var(--color-surface-base); background: var(--color-surface-base); color: var(--color-accent-yellow); font-size: 22px; font-weight: 800; }
.download-button strong { display: block; font-size: var(--font-size-lg); line-height: 1.1; }
.download-button small { color: var(--color-surface-strong); font-family: var(--font-mono); font-size: 11px; }
.download-note { margin: var(--space-6) 0 0; color: var(--color-text-inverse); font-family: var(--font-mono); font-size: 11px; }

.hero-visual { position: relative; display: flex; min-width: 0; justify-content: flex-end; align-items: center; margin: 0; }
.app-preview {
  display: block;
  width: 100%;
  max-width: 760px;
  aspect-ratio: 16 / 9;
  border: var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  object-fit: cover;
  object-position: center;
  background: var(--color-surface-strong);
}
.hero-visual figcaption {
  margin-top: var(--space-6);
  color: var(--color-text-inverse);
  font-family: var(--font-mono);
  font-size: 11px;
}

.proof { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-7); padding: var(--space-8) 0; border-bottom: var(--border); }
.proof > div { display: flex; gap: var(--space-6); align-items: center; color: var(--color-text-tertiary); font-size: var(--font-size-sm); }
.proof strong { color: var(--color-accent-yellow); font-family: var(--font-mono); font-size: var(--font-size-xs); }

.site-footer { display: flex; justify-content: space-between; gap: var(--space-8); padding: 22px 0 32px; color: var(--color-text-inverse); font-family: var(--font-mono); font-size: var(--font-size-xs); line-height: 1.4; }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-7); }
.footer-links a { color: var(--color-text-primary); text-underline-offset: 4px; }
.footer-links a:hover { color: var(--color-text-secondary); }

.toast { position: fixed; z-index: 2; left: 50%; bottom: 22px; max-width: calc(100% - 40px); padding: var(--space-6) var(--space-7); transform: translate(-50%, 18px); border: var(--border); background: var(--color-accent-lime); color: var(--color-surface-base); box-shadow: var(--shadow); opacity: 0; pointer-events: none; font-family: var(--font-mono); font-size: var(--font-size-xs); font-weight: 700; transition: opacity var(--duration-instant), transform var(--duration-instant); }
.toast.show { transform: translate(-50%, 0); opacity: 1; }
:focus-visible { outline: 3px solid var(--color-accent-cyan); outline-offset: 4px; }

@media (max-width: 980px) { .hero { grid-template-columns: 1fr; gap: var(--space-7); min-height: 0; } .hero-visual { justify-content: center; } .app-preview { max-width: 980px; } .title { max-width: none; } }
@media (max-width: 650px) {
  .site-header, .page, .site-footer { width: min(100% - 28px, 1180px); }
  .site-header { min-height: 68px; }
  .hero { padding-top: 42px; }
  .title { font-size: clamp(42px, 12vw, 54px); }
  .app-preview { box-shadow: 4px 4px 0 var(--color-border); }
  .proof { grid-template-columns: 1fr; }
  .site-footer { display: block; }
  .footer-links { margin-top: var(--space-6); }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; } }