/* ============================================================
   birdy.bike — Shared Design System (2026 refresh)
   ============================================================ */

:root {
  --brand-50:#EEF2FF; --brand-100:#E0E7FF; --brand-200:#C7D2FE;
  --brand-500:#6366F1; --brand-600:#4F46E5; --brand-700:#4338CA;
  --cyan:#06B6D4; --cyan-soft:#E0F2FE;
  --text:#0F172A; --text-soft:#475569; --text-muted:#94A3B8;
  --bg:#FFFFFF; --bg-soft:#F8FAFC; --bg-tint:#F1F5F9;
  --dark:#0B1020; --dark-2:#151B31;
  --border:#E2E8F0;
  --radius:16px; --radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.05);
  --shadow-md:0 4px 12px rgba(15,23,42,.06),0 2px 4px rgba(15,23,42,.04);
  --shadow-lg:0 16px 40px -12px rgba(79,70,229,.18),0 4px 12px rgba(15,23,42,.06);
  --grad:linear-gradient(135deg,#4F46E5 0%,#2563EB 55%,#06B6D4 100%);
  --font:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  --nav-h:64px;
  --ease:cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body {
  font-family:var(--font); color:var(--text); line-height:1.7;
  background:var(--bg); padding-top:var(--nav-h);
  font-feature-settings:'kern' 1; text-rendering:optimizeLegibility;
}
img { max-width:100%; display:block; }
::selection { background:var(--brand-100); }
:focus-visible { outline:2px solid var(--brand-500); outline-offset:2px; border-radius:4px; }

/* ---------- Navbar (glass) ---------- */
.navbar {
  position:fixed; top:0; left:0; right:0; height:var(--nav-h); z-index:1000;
  background:rgba(255,255,255,.82);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(226,232,240,.9);
}
.nav-inner {
  max-width:1200px; margin:0 auto; padding:0 24px; width:100%; height:100%;
  display:flex; align-items:center; justify-content:center; position:relative;
}
.nav-logo {
  position:absolute; left:24px; font-size:19px; font-weight:800; letter-spacing:-.02em;
  text-decoration:none; display:flex; align-items:center; gap:8px; color:var(--text);
}
.nav-logo .logo-mark {
  width:32px; height:32px; border-radius:10px; display:flex; align-items:center; justify-content:center;
  font-size:18px; background:var(--grad); color:#fff; box-shadow:0 4px 10px -3px rgba(79,70,229,.5);
}
.nav-logo .logo-dot { color:var(--brand-600); }
.nav-links { display:flex; gap:2px; list-style:none; }
.nav-links a {
  text-decoration:none; color:var(--text-soft); font-size:14px; font-weight:500;
  padding:8px 13px; border-radius:999px; transition:background .2s,color .2s; white-space:nowrap;
  display:inline-block;
}
.nav-links a:hover { background:var(--bg-tint); color:var(--text); }
.nav-links a.active { background:var(--brand-50); color:var(--brand-700); font-weight:600; }
.nav-cta { position:absolute; right:24px; }
.btn-sm { padding:9px 18px; font-size:14px; }

.hamburger {
  position:absolute; right:16px; display:none; background:none; border:none; cursor:pointer;
  padding:10px; border-radius:10px; transition:background .2s;
}
.hamburger:hover { background:var(--bg-tint); }
.hamburger span {
  display:block; width:22px; height:2px; background:var(--text); margin:5px 0;
  border-radius:2px; transition:transform .3s var(--ease),opacity .2s;
}
.hamburger.active span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity:0; }
.hamburger.active span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }

/* ---------- Mobile menu (slide-in) ---------- */
.mobile-menu {
  position:fixed; top:var(--nav-h); right:0; bottom:0; width:min(340px,86vw); z-index:999;
  background:rgba(255,255,255,.96);
  -webkit-backdrop-filter:blur(24px) saturate(180%);
  backdrop-filter:blur(24px) saturate(180%);
  border-left:1px solid var(--border);
  padding:20px 20px calc(24px + env(safe-area-inset-bottom));
  transform:translateX(105%); transition:transform .38s var(--ease);
  overflow-y:auto; box-shadow:-16px 0 40px rgba(15,23,42,.08);
}
.mobile-menu.open { transform:none; }
.mobile-menu a {
  display:flex; align-items:center; gap:10px; padding:15px 16px; text-decoration:none;
  color:var(--text); font-size:16px; font-weight:600; border-radius:12px;
  opacity:0; transform:translateX(14px); transition:opacity .3s,transform .3s var(--ease),background .2s;
}
.mobile-menu.open a { opacity:1; transform:none; }
.mobile-menu.open a:nth-child(1){transition-delay:.04s} .mobile-menu.open a:nth-child(2){transition-delay:.08s}
.mobile-menu.open a:nth-child(3){transition-delay:.12s} .mobile-menu.open a:nth-child(4){transition-delay:.16s}
.mobile-menu.open a:nth-child(5){transition-delay:.2s} .mobile-menu.open a:nth-child(6){transition-delay:.24s}
.mobile-menu.open a:nth-child(7){transition-delay:.28s} .mobile-menu.open a:nth-child(8){transition-delay:.32s}
.mobile-menu a:hover, .mobile-menu a.active { background:var(--brand-50); color:var(--brand-700); }
.mobile-menu .menu-cta {
  margin-top:14px; justify-content:center; background:var(--grad); color:#fff; font-weight:700;
  box-shadow:0 8px 20px -6px rgba(79,70,229,.5);
}
.mobile-menu .menu-cta:hover { color:#fff; filter:brightness(1.06); }
body.menu-open { overflow:hidden; }

/* ---------- Layout ---------- */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.container-sm { max-width:800px; margin:0 auto; padding:0 24px; }
section { padding:clamp(56px,9vw,88px) 0; }
section.bg-soft { background:var(--bg-soft); }

.section-head { text-align:center; max-width:680px; margin:0 auto clamp(36px,6vw,56px); }
.eyebrow {
  display:inline-flex; align-items:center; gap:7px; font-size:12px; font-weight:700;
  letter-spacing:.09em; text-transform:uppercase; color:var(--brand-700);
  background:var(--brand-50); border:1px solid var(--brand-100);
  padding:6px 14px; border-radius:999px; margin-bottom:16px;
}
.section-title { font-size:clamp(25px,4vw,36px); font-weight:800; letter-spacing:-.025em; line-height:1.2; margin-bottom:12px; }
.section-subtitle { color:var(--text-soft); font-size:clamp(15px,2vw,17px); }

/* ---------- Buttons ---------- */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 28px; border-radius:999px; font-weight:600; font-size:15px;
  text-decoration:none; border:none; cursor:pointer; touch-action:manipulation;
  transition:transform .22s var(--ease),box-shadow .22s,background .2s,border-color .2s,filter .2s;
}
.btn:active { transform:scale(.97); }
.btn-primary {
  background:linear-gradient(135deg,var(--brand-600),#2563EB); color:#fff;
  box-shadow:0 8px 20px -6px rgba(79,70,229,.45);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 14px 28px -8px rgba(79,70,229,.55); }
.btn-primary:disabled { background:#C4C9D4; box-shadow:none; cursor:not-allowed; transform:none; }
.btn-white { background:#fff; color:var(--brand-700); box-shadow:0 4px 14px rgba(2,6,23,.25); }
.btn-white:hover { transform:translateY(-2px); }
.btn-outline { border:1.5px solid rgba(255,255,255,.45); color:#fff; background:rgba(255,255,255,.07); }
.btn-outline:hover { background:rgba(255,255,255,.14); border-color:rgba(255,255,255,.8); }
.btn-light { border:1.5px solid var(--border); color:var(--text); background:#fff; }
.btn-light:hover { border-color:var(--brand-200); background:var(--brand-50); color:var(--brand-700); }

/* ---------- Cards & grids ---------- */
.grid { display:grid; gap:22px; }
.grid-2 { grid-template-columns:repeat(auto-fit,minmax(300px,1fr)); }
.grid-3 { grid-template-columns:repeat(auto-fit,minmax(300px,1fr)); }
.grid-4 { grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); }

.card {
  background:#fff; border:1px solid var(--border); border-radius:var(--radius);
  padding:28px; box-shadow:var(--shadow-sm); text-decoration:none; color:inherit;
  display:flex; flex-direction:column;
  transition:transform .35s var(--ease),box-shadow .35s,border-color .35s;
}
.card:hover { transform:translateY(-6px); box-shadow:var(--shadow-lg); border-color:var(--brand-200); }
.card h3 { font-size:19px; letter-spacing:-.01em; margin-bottom:8px; }
.card p { font-size:14px; color:var(--text-soft); line-height:1.65; flex-grow:1; }
.card .arrow { font-size:14px; font-weight:700; color:var(--brand-600); margin-top:14px; }
.card:hover .arrow { text-decoration:underline; }

.icon-tile {
  width:52px; height:52px; border-radius:14px; display:flex; align-items:center; justify-content:center;
  font-size:26px; margin-bottom:18px; flex-shrink:0;
  background:linear-gradient(135deg,var(--brand-50),var(--cyan-soft));
  border:1px solid var(--brand-100);
}

.chip {
  display:inline-block; font-size:12px; font-weight:600; padding:5px 12px;
  border-radius:999px; background:var(--brand-50); color:var(--brand-700);
  border:1px solid var(--brand-100); margin:3px;
}

.stat-card {
  background:#fff; border:1px solid var(--border); border-radius:var(--radius);
  padding:22px; text-align:center; box-shadow:var(--shadow-sm);
}
.stat-card .num { font-size:30px; font-weight:800; letter-spacing:-.02em; margin-bottom:2px;
  background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent; }
.stat-card .label { font-size:13px; color:var(--text-muted); font-weight:500; }

.note {
  background:var(--brand-50); border:1px solid var(--brand-100); border-left:4px solid var(--brand-600);
  border-radius:var(--radius-sm); padding:18px 22px; margin:28px 0; font-size:14px; color:var(--text-soft);
}
.note strong { color:var(--brand-700); }

/* ---------- Quote cards ---------- */
.quote-card {
  background:#fff; border:1px solid var(--border); border-left:4px solid var(--brand-600);
  border-radius:var(--radius-sm); padding:26px; box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease),box-shadow .3s;
}
.quote-card:hover { transform:translateY(-4px); box-shadow:var(--shadow-md); }
.quote-card blockquote { font-size:15px; line-height:1.7; color:var(--text); margin-bottom:12px; font-style:italic; }
.quote-card .attribution { font-size:13px; color:var(--text-muted); }

/* ---------- Tables ---------- */
.table-wrap {
  overflow-x:auto; -webkit-overflow-scrolling:touch;
  border:1px solid var(--border); border-radius:var(--radius); background:#fff;
  box-shadow:var(--shadow-sm);
}
table { width:100%; border-collapse:collapse; font-size:14px; min-width:640px; }
th,td { padding:14px 18px; text-align:left; border-bottom:1px solid var(--border); }
th {
  background:var(--brand-50); color:var(--brand-700); font-weight:700; font-size:12px;
  text-transform:uppercase; letter-spacing:.06em; white-space:nowrap;
}
tbody tr:last-child td { border-bottom:none; }
tbody tr { transition:background .15s; }
tbody tr:hover td { background:var(--bg-soft); }
@media (max-width:768px) {
  .table-wrap td:first-child,.table-wrap th:first-child {
    position:sticky; left:0; z-index:1; font-weight:700;
  }
  .table-wrap th:first-child { background:var(--brand-50); }
  .table-wrap td:first-child { background:#fff; box-shadow:4px 0 8px rgba(15,23,42,.05); }
  tbody tr:hover td:first-child { background:var(--bg-soft); }
}

/* ---------- Page hero (dark, gradient orbs) ---------- */
.page-hero {
  position:relative; overflow:hidden; background:var(--dark); color:#fff;
  padding:clamp(60px,9vw,104px) 0 clamp(52px,7vw,84px); text-align:center;
}
.page-hero::before,.page-hero::after {
  content:''; position:absolute; border-radius:50%; pointer-events:none;
}
.page-hero::before {
  width:620px; height:620px; top:-260px; right:-140px;
  background:radial-gradient(circle,rgba(99,102,241,.34),transparent 68%);
  filter:blur(28px);
}
.page-hero::after {
  width:520px; height:520px; bottom:-260px; left:-140px;
  background:radial-gradient(circle,rgba(6,182,212,.22),transparent 68%);
  filter:blur(28px);
}
.page-hero > .container-sm { position:relative; z-index:1; }
.page-hero h1 { font-size:clamp(28px,5.5vw,46px); font-weight:800; letter-spacing:-.03em; line-height:1.15; margin-bottom:16px; }
.page-hero h1 .text-grad {
  background:linear-gradient(90deg,#A5B4FC,#67E8F9);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.page-hero p { font-size:clamp(15px,2vw,18px); color:rgba(255,255,255,.75); max-width:620px; margin:0 auto; }
.page-hero .eyebrow { background:rgba(99,102,241,.16); border-color:rgba(129,140,248,.35); color:#C7D2FE; }

/* ---------- CTA band ---------- */
.cta-band {
  position:relative; overflow:hidden; background:var(--dark); color:#fff; text-align:center;
  padding:clamp(56px,8vw,84px) 24px;
}
.cta-band::before {
  content:''; position:absolute; inset:0; pointer-events:none;
  background:
    radial-gradient(560px 300px at 20% 0%,rgba(99,102,241,.28),transparent 70%),
    radial-gradient(560px 300px at 80% 100%,rgba(6,182,212,.2),transparent 70%);
}
.cta-band > * { position:relative; z-index:1; }
.cta-band h2 { font-size:clamp(24px,4vw,34px); font-weight:800; letter-spacing:-.025em; margin-bottom:12px; }
.cta-band p { color:rgba(255,255,255,.75); margin-bottom:28px; font-size:16px; }

/* ---------- Footer ---------- */
footer {
  text-align:center; padding:40px 24px calc(36px + env(safe-area-inset-bottom));
  font-size:13px; color:var(--text-muted); border-top:1px solid var(--border); background:var(--bg-soft);
}
footer .foot-links a { color:var(--text-soft); text-decoration:none; margin:0 7px; font-weight:500; }
footer .foot-links a:hover { color:var(--brand-600); }
footer .foot-disclaimer { margin-top:12px; max-width:640px; margin-left:auto; margin-right:auto; line-height:1.6; }

/* ---------- Reveal animations ---------- */
.reveal { opacity:0; transform:translateY(18px); transition:opacity .6s var(--ease),transform .6s var(--ease); transition-delay:var(--d,0s); }
.reveal.in { opacity:1; transform:none; }
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto; }
  .reveal { opacity:1 !important; transform:none !important; transition:none; }
  * { animation-duration:.001s !important; transition-duration:.001s !important; }
}

/* ---------- Responsive ---------- */
@media (max-width:1000px) { .nav-cta { display:none; } }
@media (max-width:768px) {
  .nav-links { display:none; }
  .hamburger { display:block; }
  .grid { gap:16px; }
  .card { padding:22px; }
  .btn { width:100%; }
  .btn-inline { width:auto; }
  .container,.container-sm { padding:0 20px; }
}