/* DilutePro — Web Landing shared design system v1.0 */
:root {
  --bg:        #FFFFFF;
  --surface-2: #FAFAFA;
  --surface-3: #F5F5F7;
  --surface-4: #EDEDF0;
  --ink:       #0A0A0A;
  --ink-2:     #3C3C43;
  --ink-3:     rgba(60,60,67,0.6);
  --ink-4:     rgba(60,60,67,0.3);
  --ink-5:     rgba(60,60,67,0.12);
  --line:      rgba(60,60,67,0.10);
  --line-2:    rgba(60,60,67,0.18);
  --accent:        #0A66E0;
  --accent-hover:  #0855BD;
  --accent-soft:   #E6EFFB;
  --pro:           #B8862F;
  --pro-soft:      #FAF6EC;
  --pro-dark:      #7A5614;
  --success:       #0E8453;
  --r-sm: 6px; --r-md: 10px; --r-lg: 14px; --r-xl: 20px; --r-2xl: 28px; --r-pill: 999px;
  --sh-1: 0 1px 2px rgba(0,0,0,0.04), 0 0 0 0.5px rgba(0,0,0,0.06);
  --sh-2: 0 4px 12px rgba(0,0,0,0.06), 0 0 0 0.5px rgba(0,0,0,0.06);
  --sh-3: 0 24px 64px -12px rgba(0,0,0,0.20), 0 0 0 0.5px rgba(0,0,0,0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', 'Helvetica Neue', system-ui, sans-serif;
  --font-mono: ui-monospace, 'SF Mono', Menlo, Monaco, 'Cascadia Mono', monospace;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body { font-family: var(--font-sans); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; background: var(--bg); color: var(--ink); overflow-x: hidden; font-size: 16px; line-height: 1.5; }
button { font-family: inherit; cursor: pointer; border: 0; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent-soft); color: var(--ink); }

/* Top nav */
.nav { position: sticky; top: 0; z-index: 50; padding: 16px 32px; display: flex; align-items: center; justify-content: space-between; background: rgba(255,255,255,0.80); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border-bottom: 0.5px solid var(--line); }
.nav-left { display: flex; align-items: center; gap: 28px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 14px; letter-spacing: -0.2px; color: var(--ink); }
.logo-mark { width: 28px; height: 28px; border-radius: 7px; background: var(--ink); display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 11px; font-family: var(--font-mono); }
.nav-links { display: none; gap: 22px; }
.nav-links a { font-size: 13px; font-weight: 500; color: var(--ink-2); transition: color .12s; }
.nav-links a:hover { color: var(--ink); }
.nav-right { display: flex; align-items: center; gap: 12px; }
.lang-toggle { display: flex; background: var(--surface-3); border-radius: var(--r-pill); padding: 3px; font-size: 11px; font-weight: 600; }
.lang-toggle button { background: transparent; color: var(--ink-3); padding: 5px 12px; border-radius: var(--r-pill); transition: all .15s; }
.lang-toggle button.active { background: #fff; color: var(--ink); box-shadow: var(--sh-1); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 42px; border-radius: var(--r-md); padding: 0 18px; font-weight: 600; font-size: 14px; letter-spacing: -0.1px; transition: background .12s, border-color .12s, transform .06s; }
.btn:active { transform: scale(.985); }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #1F1F1F; }
.btn-ghost { background: transparent; color: var(--ink); border: 0.5px solid var(--line-2); }
.btn-ghost:hover { background: var(--surface-3); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-hover); }
.btn-pro { background: var(--pro); color: #fff; }
.btn-pro:hover { background: var(--pro-dark); }
.btn-lg { height: 50px; padding: 0 22px; font-size: 15px; }
.btn svg { width: 14px; height: 14px; }

/* Pills, eyebrows */
.pill { display: inline-flex; align-items: center; gap: 8px; padding: 4px 10px; border-radius: var(--r-pill); background: var(--accent-soft); color: var(--accent); font-size: 11px; font-weight: 600; letter-spacing: .4px; text-transform: uppercase; font-family: var(--font-mono); }
.pill .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* iPhone frame */
.phone { width: 360px; height: 740px; border-radius: 52px; background: #0A0A0A; box-shadow: var(--sh-3); padding: 13px; position: relative; }
.phone::before { content: ""; position: absolute; top: 17px; left: 50%; transform: translateX(-50%); width: 104px; height: 28px; background: #0A0A0A; border-radius: 18px; z-index: 4; }
.phone-screen { width: 100%; height: 100%; border-radius: 41px; background: var(--bg); overflow: hidden; display: flex; flex-direction: column; position: relative; }
.phone-statusbar { height: 46px; padding: 15px 26px 0; display: flex; align-items: center; justify-content: space-between; font-size: 13px; font-weight: 600; color: var(--ink); }
.phone-statusbar .icns { display: flex; gap: 5px; align-items: center; }
.phone-statusbar .icns svg { width: 15px; height: 11px; }
.phone-body { flex: 1; overflow: hidden; padding: 14px 18px 0; }

/* App preview content (used inside phone) */
.app-h { font-size: 22px; font-weight: 700; letter-spacing: -.6px; margin: 4px 0 2px; }
.app-eyebrow { font-size: 10px; font-weight: 600; letter-spacing: .4px; text-transform: uppercase; color: var(--ink-3); font-family: var(--font-mono); }
.app-card { background: var(--surface-2); border: 0.5px solid var(--line); border-radius: var(--r-md); padding: 12px 14px; margin-top: 12px; }
.app-row { display: flex; justify-content: space-between; align-items: center; padding: 5px 0; font-size: 12px; font-family: var(--font-mono); }
.app-row .k { color: var(--ink-3); }
.app-row .v { color: var(--ink); font-weight: 600; }
.app-result { margin-top: 12px; padding: 16px; background: var(--ink); color: #fff; border-radius: var(--r-md); text-align: center; }
.app-result .lbl { font-size: 10px; color: rgba(255,255,255,.55); text-transform: uppercase; letter-spacing: .5px; font-family: var(--font-mono); }
.app-result .num { font-size: 36px; font-weight: 600; color: #fff; font-family: var(--font-mono); margin-top: 4px; letter-spacing: -.8px; line-height: 1; }
.app-result .sub { font-size: 11px; color: rgba(255,255,255,.55); margin-top: 4px; }
.app-tabbar { display: flex; gap: 4px; margin: 14px -18px 0; padding: 12px 18px 14px; border-top: 0.5px solid var(--line); }
.app-tab { flex: 1; height: 30px; background: var(--surface-3); border-radius: var(--r-sm); display: grid; place-items: center; font-size: 9px; font-weight: 600; color: var(--ink-3); letter-spacing: .3px; text-transform: uppercase; font-family: var(--font-mono); }
.app-tab.active { background: var(--accent); color: #fff; }

/* Footer */
.footer { padding: 56px 32px 40px; border-top: 0.5px solid var(--line); background: var(--surface-2); }
.footer-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
.footer h4 { font-size: 12px; font-weight: 600; letter-spacing: .4px; text-transform: uppercase; color: var(--ink-3); margin: 0 0 14px; font-family: var(--font-mono); }
.footer-col a { display: block; font-size: 13px; color: var(--ink-2); margin-bottom: 8px; transition: color .12s; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { max-width: 1200px; margin: 40px auto 0; padding-top: 24px; border-top: 0.5px solid var(--line); display: flex; justify-content: space-between; font-size: 12px; color: var(--ink-3); }

/* Animations */
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fade .5s ease both; }

@media (min-width: 900px) {
  .nav-links { display: flex; }
}