/* ============================================================
   RANZER - Apple-Inspired Design System
   ============================================================ */

:root {
  --primary:        #2563EB;
  --primary-hover:  #1D4ED8;
  --primary-press:  #1E40AF;
  --text-dom:       #0F172A;
  --text-sec:       #1E293B;
  --text-ter:       #64748B;
  --bg:             #FFFFFF;
  --surface:        #E2E8F0;
  --nav-bg:         rgba(255, 255, 255, 0.85);
  --border:         rgba(0, 0, 0, 0.08);
  --overlay:        rgba(0, 0, 0, 0.8);
  --dark-surface:   #0F172A;
  --dark-medium:    #1E293B;
  --font-display:   "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-text:      "SF Pro Text",    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --max-w:          1262px;
  --radius-btn:     50px;
  --radius-input:   8px;
  --transition:     0.2s ease;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-text); font-size: 17px; color: var(--text-dom); background: var(--bg); line-height: 25px; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ── Container ───────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-btn);
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover  { background: var(--primary-hover); }
.btn-primary:active { background: var(--primary-press); }

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-secondary:hover  { background: rgba(37,99,235,0.05); border-color: var(--primary-hover); }
.btn-secondary:active { border-color: var(--primary-press); }

.btn-ghost {
  background: transparent;
  color: var(--text-dom);
  padding: 0 8px;
  border-radius: 0;
}
.btn-ghost:hover  { background: rgba(0,0,0,0.05); }
.btn-ghost:active { background: rgba(0,0,0,0.08); }

.btn-sm { height: 36px; padding: 0 16px; font-size: 15px; }

/* ── Navigation ──────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 44px;
  background: rgba(11, 18, 32, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.07);
  transition: background var(--transition), border-color var(--transition);
}
/* Once scrolled past hero, nav picks up the light frosted look */
.nav.scrolled {
  background: var(--nav-bg);
  border-bottom-color: var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.3px;
  flex-shrink: 0;
  transition: color var(--transition);
}
.nav.scrolled .nav-logo { color: var(--text-dom); }
.nav-logo svg { width: 22px; height: 22px; }
.nav-logo-img  { width: auto; height: 22px; object-fit: contain; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 12px;
  font-size: 14px;
  font-weight: 400;
  color: rgba(255,255,255,0.75);
  transition: color var(--transition);
}
.nav-links a:hover { color: #fff; }
.nav.scrolled .nav-links a { color: rgba(0,0,0,0.8); }
.nav.scrolled .nav-links a:hover { color: var(--primary); }

.nav-actions { display: flex; align-items: center; gap: 8px; }

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
  color: var(--text-dom);
}
.nav-hamburger svg { width: 20px; height: 20px; }

/* Mobile drawer */
.nav-drawer {
  display: none;
  position: fixed;
  top: 44px; left: 0; right: 0; bottom: 0;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  padding: 24px 20px;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}
.nav-drawer.open { display: flex; }
.nav-drawer a {
  display: flex;
  align-items: center;
  height: 52px;
  padding: 0 16px;
  font-size: 17px;
  font-weight: 400;
  color: var(--text-dom);
  border-radius: 12px;
  transition: background var(--transition);
}
.nav-drawer a:hover { background: var(--surface); }
.nav-drawer .drawer-cta { margin-top: 16px; }

/* ── Fade-in animation ───────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Section shared ──────────────────────────────────────── */
.section-label {
  font-family: var(--font-text);
  font-size: 12px;
  font-weight: 400;
  line-height: 16px;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.section-heading {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  line-height: 44px;
  color: var(--text-dom);
  margin-bottom: 16px;
}
.section-sub {
  font-size: 17px;
  font-weight: 400;
  line-height: 25px;
  color: var(--text-ter);
  max-width: 560px;
}
.section-header { margin-bottom: 56px; }

/* ── Hero ────────────────────────────────────────────────── */
.hero {
  padding-top: calc(44px + 100px);
  padding-bottom: 110px;
  text-align: center;
  background-color: #0B1220;
  background-image:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(37, 99, 235, 0.18) 0%, transparent 70%),
    radial-gradient(circle, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 100% 100%, 28px 28px;
  position: relative;
  overflow: hidden;
}
/* Soft bottom fade so hero blends into the white trust bar */
.hero::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 80px;
  background: linear-gradient(to bottom, transparent, #0B1220);
  pointer-events: none;
}
.hero .container { display: flex; flex-direction: column; align-items: center; position: relative; z-index: 1; }

/* Hero logo - size by width since it's a landscape image */
.hero-logo {
  width: 180px;
  height: auto;
  max-width: none;
  display: block;
  margin: 0 auto 36px;
  filter: drop-shadow(0 8px 28px rgba(37, 99, 235, 0.4))
          drop-shadow(0 2px 8px rgba(37, 99, 235, 0.25));
}
.hero-eyebrow {
  font-size: 12px;
  font-weight: 400;
  line-height: 16px;
  color: #60A5FA;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -1px;
  color: #FFFFFF;
  margin-bottom: 24px;
}
.hero-sub {
  font-size: 19px;
  font-weight: 400;
  line-height: 28px;
  color: #94A3B8;
  max-width: 580px;
  margin-bottom: 40px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 20px;
}
/* Secondary button needs to be visible on dark */
.hero .btn-secondary {
  border-color: rgba(255,255,255,0.3);
  color: #fff;
}
.hero .btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.5);
}
.hero-note {
  font-size: 12px;
  font-weight: 400;
  line-height: 16px;
  color: #475569;
}

/* ── Trust bar ───────────────────────────────────────────── */
.trust {
  border-top: 1px solid var(--surface);
  border-bottom: 1px solid var(--surface);
  padding: 28px 0;
}
.trust-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 400;
  color: var(--text-sec);
}
.trust-item svg { color: var(--primary); flex-shrink: 0; }

/* ── Features ────────────────────────────────────────────── */
.features { padding: 100px 0; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--surface);
}
.feature-card {
  padding: 40px;
  border-right: 1px solid var(--surface);
  border-bottom: 1px solid var(--surface);
  transition: background var(--transition);
}
.feature-card:nth-child(3n) { border-right: none; }
.feature-card:nth-child(n+4) { border-bottom: none; }
.feature-card:hover { background: rgba(37,99,235,0.02); }

.feature-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 20px;
  color: var(--primary);
}
.feature-title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 24px;
  color: var(--text-dom);
  margin-bottom: 8px;
}
.feature-desc {
  font-size: 15px;
  font-weight: 400;
  line-height: 22px;
  color: var(--text-ter);
}

/* ── How it works ────────────────────────────────────────── */
.how { padding: 100px 0; background: #EFF6FF; }
.how .section-header { text-align: center; }
.how .section-sub { margin: 0 auto; text-align: center; }
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}
.step {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 40px;
  background: #fff;
  border: 1px solid var(--surface);
}
.step-number {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1;
  color: var(--surface);
}
.step-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-dom);
}
.step-desc {
  font-size: 15px;
  line-height: 22px;
  color: var(--text-ter);
}

/* ── Download ────────────────────────────────────────────── */
.download { padding: 100px 0; }
.download .section-header { text-align: center; }
.download .section-sub { margin: 0 auto; text-align: center; }
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 56px;
}
.download-card {
  padding: 48px;
  border: 1px solid var(--surface);
  display: flex;
  flex-direction: column;
  gap: 24px;
  transition: box-shadow var(--transition);
}
.download-card:hover {
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}
.download-card-icon {
  width: 48px;
  height: 48px;
  color: var(--text-dom);
}
.download-card-os {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-ter);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.download-card-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
  line-height: 32px;
  color: var(--text-dom);
  margin-top: 4px;
}
.download-card-desc {
  font-size: 15px;
  line-height: 22px;
  color: var(--text-ter);
  flex: 1;
}
.download-card-meta {
  font-size: 12px;
  color: var(--text-ter);
}
.download-card-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── GitHub Install ──────────────────────────────────────── */
.github { padding: 100px 0; background: #EFF6FF; }
.github .section-header { text-align: center; }
.github .section-sub { margin: 0 auto; text-align: center; }

.install-tabs { margin-top: 56px; }
.tab-buttons {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--surface);
  margin-bottom: 0;
}
.tab-btn {
  height: 44px;
  padding: 0 24px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-family: var(--font-text);
  font-size: 15px;
  font-weight: 400;
  color: var(--text-ter);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
  margin-bottom: -1px;
}
.tab-btn:hover { color: var(--text-dom); }
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.code-block {
  background: var(--dark-surface);
  padding: 32px;
  margin-top: 0;
  border: 1px solid #2A2A2C;
  border-top: none;
  overflow-x: auto;
}
.code-block pre {
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 20px;
  color: #E8E8ED;
  white-space: pre;
}
.code-block .comment { color: #6E6E73; }
.code-block .cmd     { color: #30D158; }
.code-block .flag    { color: #64D2FF; }

/* ── CTA Banner ──────────────────────────────────────────── */
.cta-banner {
  padding: 100px 0;
  text-align: center;
  background: var(--text-dom);
}
.cta-banner .section-label { color: rgba(255,255,255,0.5); }
.cta-banner .section-heading { color: #fff; margin-bottom: 16px; }
.cta-banner .section-sub { color: rgba(255,255,255,0.6); margin: 0 auto 40px; }
.cta-banner .btn-primary {
  background: #fff;
  color: var(--text-dom);
}
.cta-banner .btn-primary:hover { background: #F5F5F7; }
.cta-banner .btn-secondary {
  border-color: rgba(255,255,255,0.4);
  color: #fff;
}
.cta-banner .btn-secondary:hover { background: rgba(255,255,255,0.08); }

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  background: var(--dark-surface);
  padding: 40px 0;
  border-top: 1px solid #2A2A2C;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: #fff;
}
.footer-logo svg { width: 18px; height: 18px; }
.footer-logo-img  { width: auto; height: 18px; object-fit: contain; }
.footer-copy {
  font-size: 12px;
  color: #6E6E73;
  margin-top: 4px;
}
.footer-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-nav a {
  font-size: 13px;
  color: #6E6E73;
  transition: color var(--transition);
}
.footer-nav a:hover { color: #fff; }

/* ── VU Attribution strip ────────────────────────────────── */
.attribution {
  background: #070F1C;
  border-top: 1px solid #1E293B;
  padding: 32px 0;
}
.attribution-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}
.attribution-logo {
  height: 40px;
  width: auto;
  object-fit: contain;
  /* VU logo is black on white - invert it to white for dark background */
  filter: invert(1) brightness(0.85);
  opacity: 0.75;
  transition: opacity 0.2s;
}
.attribution-logo:hover { opacity: 1; }
.attribution-divider {
  width: 1px;
  height: 32px;
  background: #2A3A50;
}
.attribution-text {
  font-size: 13px;
  color: #64748B;
  line-height: 20px;
  text-align: center;
}
.attribution-text strong {
  color: #94A3B8;
  font-weight: 400;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1023px) {
  .container { padding: 0 24px; }
  .trust-inner { padding: 0 24px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card:nth-child(3n) { border-right: 1px solid var(--surface); }
  .feature-card:nth-child(2n) { border-right: none; }
  .feature-card:nth-child(n+4) { border-bottom: 1px solid var(--surface); }
  .feature-card:nth-child(n+5) { border-bottom: none; }
  .steps { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .section-heading { font-size: 32px; line-height: 36px; }
}

@media (max-width: 767px) {
  .container { padding: 0 16px; }
  .trust-inner { padding: 0 16px; gap: 20px; }
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .nav-hamburger { display: flex; }
  .hero { padding-top: calc(44px + 60px); padding-bottom: 60px; }
  .hero-title { font-size: 36px; letter-spacing: -0.5px; }
  .hero-sub { font-size: 17px; }
  .hero-actions { flex-direction: column; align-items: center; width: 100%; }
  .hero-actions .btn { width: 100%; max-width: 320px; }
  .features { padding: 60px 0; }
  .features-grid { grid-template-columns: 1fr; }
  .feature-card:nth-child(n) { border-right: none; border-bottom: 1px solid var(--surface); }
  .feature-card:last-child { border-bottom: none; }
  .feature-card { padding: 28px 24px; }
  .how { padding: 60px 0; }
  .step { padding: 28px 24px; }
  .download { padding: 60px 0; }
  .download-card { padding: 32px 24px; }
  .github { padding: 60px 0; }
  .cta-banner { padding: 60px 0; }
  .section-heading { font-size: 28px; line-height: 32px; }
  .section-header { margin-bottom: 40px; }
  .steps { margin-top: 40px; }
  .download-grid { margin-top: 40px; }
  .install-tabs { margin-top: 40px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-nav { gap: 16px; }
  .attribution-inner { padding: 0 16px; gap: 16px; }
  .attribution-divider { display: none; }
  .attribution-logo { height: 32px; }
}