/* KivuStack Ltd — website style.css — lightweight, no dependencies
   Brand palette: see assets/brand-guidelines.md — primary #0f172a, accent #2563eb, dark #0b1020 */
:root{
  --bg:#ffffff;
  --bg-alt:#f8fafc;
  --bg-hero:#0b1020;
  --bg-hero-2:#111a33;
  --surface:#ffffff;
  --text:#0f172a; /* primary */
  --muted:#64748b; /* muted */
  --muted-2:#94a3b8;
  --line:#e2e8f0; /* border */
  --line-strong:#cbd5e1;
  --accent:#2563eb; /* KivuStack Blue */
  --accent-hover:#1d4ed8;
  --accent-soft:#eff6ff;
  --accent-border:#bfdbfe;
  --radius:14px;
  --radius-lg:18px;
  --shadow:0 4px 24px rgba(15,23,42,.06);
  --shadow-lg:0 12px 40px rgba(15,23,42,.10);
  --header-h:64px;
  --max:1120px;
  --focus:0 0 0 3px rgba(37,99,235,.35);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth; scroll-padding-top:calc(var(--header-h) + 16px)}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none !important; transition:none !important}
}
body{
  margin:0;
  font-family:ui-sans-system,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",Ubuntu,Cantarell,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%; display:block}
a{color:var(--accent); text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible{outline:none; box-shadow:var(--focus); border-radius:6px}
p{margin:0 0 1em}
h1,h2,h3{line-height:1.15; letter-spacing:-.02em; margin:0}
h1{font-size:clamp(2rem,5vw,3.25rem); font-weight:800}
h2{font-size:clamp(1.6rem,3.5vw,2rem); font-weight:700}
h3{font-size:1.05rem; font-weight:650}

/* Skip link */
.skip{
  position:absolute; left:-9999px; top:auto; width:1px; height:1px; overflow:hidden;
}
.skip:focus{
  left:16px; top:16px; width:auto; height:auto; background:var(--accent); color:#fff;
  padding:10px 14px; border-radius:8px; z-index:999; text-decoration:none; box-shadow:var(--shadow-lg)
}

/* Container */
.container{max-width:var(--max); margin:0 auto; padding:0 20px}
@media(min-width:768px){ .container{padding:0 24px} }
.section{padding:72px 0}
@media(min-width:900px){ .section{padding:88px 0} }
.section-alt{background:var(--bg-alt); border-top:1px solid var(--line); border-bottom:1px solid var(--line)}
.eyebrow{
  font-size:.75rem; letter-spacing:.14em; text-transform:uppercase; color:var(--accent);
  font-weight:700; margin-bottom:12px
}
.lead{font-size:1.05rem; color:var(--muted); max-width:60ch}
.section-header{max-width:720px; margin-bottom:36px}
.section-header p{color:var(--muted); margin-top:12px; font-size:1.02rem}

/* Header */
.site-header{
  position:sticky; top:0; z-index:40;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:var(--header-h); gap:16px;
}
.wordmark{
  font-weight:800; font-size:1.05rem; letter-spacing:-.02em; color:var(--text);
  text-decoration:none; display:inline-flex; align-items:center; gap:10px;
  white-space:nowrap;
}
.wordmark-mark{
  width:30px; height:30px; border-radius:8px; background:var(--text); color:#fff;
  display:grid; place-items:center; font-size:.72rem; font-weight:800; letter-spacing:.06em;
}
.wordmark:hover{text-decoration:none}
.brand{
  display:inline-flex; align-items:center; text-decoration:none; line-height:0;
}
.brand img{ display:block; height:32px; width:auto; }
.brand:hover{opacity:.92}
.brand:focus-visible{box-shadow:var(--focus); border-radius:8px}
.footer-brand{ display:flex; flex-direction:column; gap:10px; align-items:flex-start; }
.footer-brand img{ display:block; height:28px; width:auto; }
.footer-wordmark{font-weight:800; letter-spacing:-.02em}
.nav-primary ul{
  list-style:none; margin:0; padding:0; display:flex; align-items:center; gap:6px;
}
.nav-primary a{
  display:inline-flex; align-items:center; padding:9px 12px; border-radius:10px;
  color:var(--text); font-size:.92rem; font-weight:550; text-decoration:none;
}
.nav-primary a:hover{background:var(--bg-alt); text-decoration:none}
.nav-primary a.is-active{background:var(--bg-alt)}
.nav-github{
  background:var(--text) !important; color:#fff !important;
  padding:9px 14px !important; border-radius:999px !important; margin-left:6px;
  box-shadow:0 1px 0 rgba(15,23,42,.08);
}
.nav-github:hover{background:#1e293b !important; transform:translateY(-0.5px)}
.nav-github:focus-visible{box-shadow:var(--focus)}

/* Mobile toggle */
.nav-toggle{
  display:none; appearance:none; border:1px solid var(--line); background:#fff;
  width:40px; height:40px; border-radius:10px; align-items:center; justify-content:center;
  cursor:pointer; color:var(--text);
}
.nav-toggle:hover{background:var(--bg-alt)}
.nav-toggle:focus-visible{box-shadow:var(--focus)}
.nav-toggle-lines{width:16px; height:12px; position:relative; display:block}
.nav-toggle-lines i,
.nav-toggle-lines i::before,
.nav-toggle-lines i::after{
  content:""; position:absolute; left:0; width:100%; height:2px; background:var(--text);
  border-radius:2px; transition:transform .18s ease, opacity .18s ease, top .18s ease;
}
.nav-toggle-lines i{top:5px}
.nav-toggle-lines i::before{top:-5px}
.nav-toggle-lines i::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle-lines i{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-lines i::before{transform:rotate(45deg); top:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-lines i::after{transform:rotate(-45deg); top:0}

@media(max-width:860px){
  .nav-toggle{display:inline-flex}
  .nav-primary{
    position:fixed; inset:calc(var(--header-h)) 0 auto 0;
    background:#fff; border-bottom:1px solid var(--line);
    padding:12px 16px 16px; box-shadow:var(--shadow-lg);
    display:none;
  }
  .nav-primary.is-open{display:block}
  .nav-primary ul{flex-direction:column; align-items:stretch; gap:4px}
  .nav-primary a{padding:14px 14px; font-size:1rem}
  .nav-primary a.nav-github{margin:8px 0 0; justify-content:center}
}

/* Hero */
.hero{
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(37,99,235,.18), transparent 60%),
    radial-gradient(700px 420px at 10% 0%, rgba(99,102,241,.14), transparent 55%),
    linear-gradient(180deg, var(--bg-hero) 0%, var(--bg-hero-2) 100%);
  color:#e2e8f0; position:relative; overflow:hidden;
  border-bottom:1px solid rgba(255,255,255,.06);
}
.hero-inner{padding:64px 0 56px}
@media(min-width:900px){ .hero-inner{padding:96px 0 88px} }
.hero-grid{
  display:grid; gap:36px; align-items:center;
}
@media(min-width:900px){ .hero-grid{grid-template-columns:1.08fr .92fr; gap:48px} }
.hero-copy .eyebrow{color:#93c5fd}
.hero h1{color:#f8fafc; max-width:16ch}
.hero h1 span{color:#93c5fd; font-weight:800}
.hero p{
  color:#cbd5e1; font-size:1.06rem; max-width:56ch; margin-top:14px;
}
@media(min-width:900px){ .hero p{font-size:1.1rem} }
.hero-ctas{display:flex; flex-wrap:wrap; gap:12px; margin-top:28px}
.btn{
  appearance:none; border:1px solid transparent; background:var(--accent); color:#fff;
  padding:12px 18px; border-radius:999px; font-weight:650; font-size:.95rem;
  display:inline-flex; align-items:center; gap:8px; text-decoration:none; line-height:1;
  cursor:pointer; transition:transform .14s ease, background .14s ease, box-shadow .14s ease;
  box-shadow:0 8px 20px rgba(37,99,235,.22);
}
.btn:hover{background:var(--accent-hover); transform:translateY(-1px); text-decoration:none}
.btn:active{transform:translateY(0)}
.btn:focus-visible{box-shadow:var(--focus)}
.btn-secondary{
  background:rgba(255,255,255,.08); color:#e2e8f0; border-color:rgba(255,255,255,.14);
  box-shadow:none; backdrop-filter:blur(6px);
}
.btn-secondary:hover{background:rgba(255,255,255,.12); color:#fff}
.hero-card{
  background:rgba(255,255,255,.92); color:var(--text);
  border-radius:var(--radius-lg); padding:22px;
  box-shadow:0 20px 60px rgba(2,6,23,.28), 0 1px 0 rgba(255,255,255,.6) inset;
  border:1px solid rgba(255,255,255,.7);
}
@media(min-width:900px){ .hero-card{padding:24px} }
.hero-card-head{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding-bottom:14px; border-bottom:1px solid var(--line); margin-bottom:14px;
}
.hero-card-kicker{
  font-size:.72rem; letter-spacing:.14em; text-transform:uppercase; font-weight:750; color:var(--muted)
}
.hero-card-dot{width:8px; height:8px; border-radius:50%; background:#22c55e; box-shadow:0 0 0 6px rgba(34,197,94,.14)}
.hero-card h3{font-size:1rem; margin-bottom:6px}
.hero-card p{color:var(--muted); font-size:.92rem; margin:0}
.hero-card-list{
  list-style:none; margin:16px 0 0; padding:0; display:grid; gap:10px;
}
.hero-card-list li{
  display:flex; align-items:flex-start; gap:10px; font-size:.92rem; color:var(--text);
  padding:10px 11px; background:var(--bg-alt); border:1px solid var(--line); border-radius:12px;
}
.hero-card-list li span{color:var(--accent); font-weight:800; margin-top:1px}
.hero-trust{
  display:flex; flex-wrap:wrap; gap:8px; margin-top:18px;
}
.trust-pill{
  font-size:.78rem; color:#475569; background:#fff; border:1px solid var(--line);
  padding:6px 10px; border-radius:999px; font-weight:600;
}

/* Cards / grids */
.grid{ display:grid; gap:14px }
.grid-3{grid-template-columns:1fr}
@media(min-width:640px){ .grid-3{grid-template-columns:repeat(2,1fr)} }
@media(min-width:980px){ .grid-3{grid-template-columns:repeat(3,1fr)} }
.grid-2{grid-template-columns:1fr}
@media(min-width:820px){ .grid-2{grid-template-columns:repeat(2,1fr)} }

.card{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:20px; box-shadow:var(--shadow); transition:transform .14s ease, box-shadow .14s ease, border-color .14s ease;
}
.card:hover{transform:translateY(-2px); box-shadow:var(--shadow-lg); border-color:var(--line-strong)}
.card-icon{
  width:36px; height:36px; border-radius:10px; display:grid; place-items:center;
  background:var(--accent-soft); border:1px solid var(--accent-border); color:var(--accent);
  font-size:.9rem; margin-bottom:12px;
}
.card h3{margin-bottom:6px}
.card p{color:var(--muted); font-size:.93rem; margin:0; line-height:1.55}

/* Mission / Vision */
.split{
  display:grid; gap:14px;
}
@media(min-width:820px){ .split{grid-template-columns:1fr 1fr} }
.callout{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:24px; box-shadow:var(--shadow);
}
.callout strong{display:block; font-size:.75rem; letter-spacing:.14em; text-transform:uppercase; color:var(--accent); margin-bottom:10px}
.callout p{color:var(--muted); margin:0; font-size:1rem; line-height:1.6}
.callout.mission{border-left:4px solid var(--accent)}
.callout.vision{border-left:4px solid #0f172a}
.quote{
  font-size:1.125rem; color:var(--text); font-weight:650; line-height:1.45; margin:0 0 8px;
}

/* Principles */
.principles-grid{
  display:grid; gap:12px; grid-template-columns:1fr;
}
@media(min-width:640px){ .principles-grid{grid-template-columns:repeat(2,1fr)} }
@media(min-width:1020px){ .principles-grid{grid-template-columns:repeat(3,1fr)} }
.principle{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:18px 18px 16px; display:flex; gap:12px; align-items:flex-start;
}
.principle-num{
  flex:0 0 28px; height:28px; border-radius:999px; background:var(--text); color:#fff;
  display:grid; place-items:center; font-size:.75rem; font-weight:800; margin-top:1px;
}
.principle h3{font-size:.98rem; margin-bottom:4px}
.principle p{color:var(--muted); font-size:.9rem; margin:0; line-height:1.5}

/* Projects */
.projects-stage{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-lg);
  padding:28px; box-shadow:var(--shadow); text-align:center;
}
@media(min-width:640px){ .projects-stage{padding:36px} }
.badge{
  display:inline-flex; align-items:center; gap:8px;
  background:var(--accent-soft); border:1px solid var(--accent-border); color:var(--accent);
  font-size:.78rem; font-weight:750; letter-spacing:.06em; text-transform:uppercase;
  padding:6px 10px; border-radius:999px; margin-bottom:14px;
}
.badge-dot{width:6px; height:6px; border-radius:50%; background:var(--accent)}
.projects-stage h3{font-size:1.2rem; margin-bottom:8px}
.projects-stage p{color:var(--muted); max-width:60ch; margin:0 auto 18px; font-size:.98rem}
.projects-note{
  display:flex; flex-wrap:wrap; justify-content:center; gap:8px; margin-top:18px;
}
.mini{font-size:.82rem; color:var(--muted); background:var(--bg-alt); border:1px solid var(--line); padding:7px 10px; border-radius:999px}

/* Technology */
.tech-wrap{
  display:grid; gap:16px; align-items:start;
}
@media(min-width:860px){ .tech-wrap{grid-template-columns: 1.15fr .85fr} }
.tech-list{
  list-style:none; margin:16px 0 0; padding:0; display:grid; gap:10px;
}
.tech-list li{
  display:flex; gap:10px; align-items:flex-start;
  background:var(--surface); border:1px solid var(--line); border-radius:12px;
  padding:12px 14px; box-shadow:var(--shadow);
}
.tech-list li i{
  width:28px; height:28px; border-radius:8px; background:var(--bg-alt); border:1px solid var(--line);
  display:grid; place-items:center; flex:0 0 28px; color:var(--accent); font-size:.85rem;
}
.tech-panel{
  background:var(--text); color:#e2e8f0; border-radius:var(--radius); padding:22px;
  border:1px solid rgba(255,255,255,.08);
}
.tech-panel h3{color:#f8fafc; margin-bottom:8px}
.tech-panel p{color:#94a3b8; margin:0; font-size:.93rem}
.tech-panel code{
  display:block; margin-top:14px; background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.08);
  color:#e2e8f0; padding:10px 12px; border-radius:10px; font-size:.82rem; font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace; overflow:auto;
}

/* Contact */
.contact-grid{
  display:grid; gap:16px;
}
@media(min-width:820px){ .contact-grid{grid-template-columns:1.2fr .8fr} }
.contact-card{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:22px; box-shadow:var(--shadow);
}
.contact-card p{color:var(--muted); margin:0}
.contact-placeholder{
  background:var(--bg-alt); border:1px dashed var(--line-strong); border-radius:12px;
  padding:14px 14px; color:var(--muted); font-size:.92rem; margin-top:14px;
}
.github-card{
  background:var(--text); color:#e2e8f0; border-radius:var(--radius); padding:22px;
  border:1px solid rgba(255,255,255,.08); display:flex; flex-direction:column; gap:14px;
}
.github-card h3{color:#fff}
.github-card p{color:#94a3b8; margin:0; font-size:.93rem}
.github-card a.btn{justify-content:center; background:#fff; color:var(--text); box-shadow:none; border-color:#fff}
.github-card a.btn:hover{background:#f8fafc}

/* Footer */
.site-footer{
  border-top:1px solid var(--line); background:var(--bg); padding:28px 0;
}
.footer-row{
 display:flex; flex-direction:column; gap:16px; align-items:flex-start;
}
@media(min-width:700px){ .footer-row{flex-direction:row; justify-content:space-between; align-items:center} }
.footer-wordmark{font-weight:800; letter-spacing:-.02em}
.footer-meta{color:var(--muted); font-size:.88rem}
.footer-links{display:flex; flex-wrap:wrap; gap:14px; font-size:.88rem}
.footer-links a{color:var(--muted)}
.footer-links a:hover{color:var(--text); text-decoration:underline}

/* Reveal animation */
.reveal{opacity:0; transform:translateY(8px); transition:opacity .5s ease, transform .5s ease}
.reveal.is-visible{opacity:1; transform:none}

/* Utilities */
.sr-only{position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0}

/* 404 */
.page-404{
  min-height:70vh; display:grid; place-items:center; padding:48px 0; text-align:center;
}
.page-404 h1{font-size:clamp(3rem, 10vw, 6rem); line-height:1; letter-spacing:-.04em}
.page-404 p{color:var(--muted); max-width:48ch; margin:12px auto 20px}