:root{
  --bg:#f5f5f0;
  --panel:#ebe8e0;
  --panel-rgb:235,232,224;
  --text:#1a1a1a;
  --muted:#5a5a52;
  --border:rgba(0,0,0,.08);
  --primary:#4a9fd4;
  --primary2:#c9a8d4;
  --primary-rgb:74,159,212;
  --primary2-rgb:201,168,212;
  --pattern-a: repeating-linear-gradient(135deg, rgba(74,159,212,.04) 0 12px, transparent 12px 24px);
  --pattern-b: repeating-radial-gradient(circle at 20% 30%, rgba(201,168,212,.03) 0 8px, transparent 8px 20px);
  --shadow: 0 8px 32px rgba(0,0,0,.08);
  --radius: 18px;
}

*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
html{
  scroll-snap-type: y mandatory;
}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color:var(--text);
  line-height:1.55;
}

a{color:inherit}

.container{
  width:min(1100px, calc(100% - 40px));
  margin-inline:auto;
}

.site-header{
  position:sticky;
  top:0;
  z-index:10;
  backdrop-filter: blur(10px);
  background: rgba(var(--panel-rgb), .85);
  border-bottom: 1px solid var(--border);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 14px 0;
}

.site-nav{
  display:flex;
  gap:18px;
  align-items:center;
}

.nav-link{
  text-decoration:none;
  color:var(--muted);
  padding:8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
}

.nav-link[aria-current="page"]{
  color:var(--text);
  border-color: var(--border);
  background: rgba(0,0,0,.05);
}

main{
  padding: 24px 0 40px;
  position: relative;
  z-index: 1;
}

.bg-overlay{
  position: fixed;
  inset: -25%;
  z-index: 0;
  pointer-events: none;
  opacity: .5;
  filter: blur(40px);
  transform: translate3d(0,0,0);
  transition: opacity .4s ease;
  background:
    radial-gradient(900px 600px at 15% 10%, rgba(var(--primary-rgb), .12), transparent 62%),
    radial-gradient(700px 500px at 85% 20%, rgba(var(--primary2-rgb), .10), transparent 55%),
    radial-gradient(800px 700px at 55% 110%, rgba(var(--primary-rgb), .08), transparent 60%),
    var(--pattern-a),
    var(--pattern-b);
  background-repeat: no-repeat, no-repeat, no-repeat, repeat, repeat;
}

body.bg-glitch .bg-overlay{
  animation: bgGlitch .75s ease-out;
}

@keyframes bgGlitch{
  0%{opacity:.4; transform: translate3d(0,0,0) scale(1);}
  22%{opacity:.55; transform: translate3d(-0.5%, 0.5%, 0) scale(1.01);}
  45%{opacity:.48; transform: translate3d(0.5%, -0.5%, 0) scale(1.01);}
  100%{opacity:.4; transform: translate3d(0,0,0) scale(1);}
}

.section{
  min-height: 100vh;
  padding: 44px 0;
  scroll-margin-top: 60px;
  position: relative;
  z-index: 1;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section-inner{
  background: rgba(var(--panel-rgb), .95);
  border: 1px solid rgba(0,0,0,.12);
  border-radius: var(--radius);
  box-shadow: 0 4px 24px rgba(0,0,0,.08), 0 1px 3px rgba(0,0,0,.06);
  padding: 26px;
}

.section-title{
  margin: 0 0 10px;
  font-size: 28px;
}

.section-lead{
  margin: 0 0 18px;
  color: var(--muted);
  max-width: 75ch;
}

.two-col{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items:start;
}

.card{
  background: rgba(255,255,255,.85);
  border: 1px solid rgba(0,0,0,.1);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 1px 8px rgba(0,0,0,.05);
}

.hero{
  min-height: 100vh;
  padding: 36px 0 10px;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-inner{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 24px;
  align-items:center;
}

.hero-copy h1{
  margin: 0 0 12px;
  font-size: clamp(26px, 3.2vw, 44px);
  letter-spacing: -0.02em;
}

.hero-copy p{
  margin: 0 0 18px;
  color: var(--muted);
  max-width: 60ch;
}

.hero-actions{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding: 11px 14px;
  border-radius: 12px;
  text-decoration:none;
  font-weight:600;
  border: 1px solid var(--border);
}

.btn-primary{
  background: linear-gradient(135deg, rgba(var(--primary-rgb), .25), rgba(var(--primary2-rgb), .2));
  border-color: rgba(0,0,0,.1);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), .08);
}

.btn-ghost{
  color: var(--text);
  background: rgba(0,0,0,.04);
}

.hero-card{ display:none; }

.hero-photo-wrap{
  display:flex;
  justify-content:center;
  align-items:center;
  padding: 10px 0;
}

.hero-photo{
  width: 60%;
  height: auto;
  display:block;
  margin: 0 auto;
  border-radius: 14px;
  border: 0;
  box-shadow: none;
}

.clean-list{
  margin:0;
  padding-left: 18px;
  color: var(--text);
}

.page-intro h2{
  margin: 0 0 10px;
  font-size: 28px;
}

.page-intro p{
  margin:0 0 18px;
  color: var(--muted);
  max-width: 70ch;
}

.tabs{
  border: 1px solid var(--border);
  background: rgba(15,26,51,.6);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.tab-buttons{
  display:flex;
  gap: 10px;
  flex-wrap:wrap;
  margin-bottom: 14px;
}

.tab-button{
  appearance:none;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 10px 12px;
  border-radius: 12px;
  font-weight: 650;
  cursor:pointer;
}

.tab-button.is-active{
  color: var(--text);
  background: rgba(255,255,255,.08);
  border-color: rgba(200,220,255,.25);
}

.tab-panel h3{
  margin: 10px 0 8px;
  font-size: 18px;
}

.tab-panel p{
  margin: 0 0 14px;
  color: var(--muted);
  max-width: 80ch;
}

.note{
  border-left: 3px solid rgba(var(--primary-rgb), .45);
  padding-left: 12px;
  color: var(--text);
  background: rgba(var(--primary-rgb), .06);
  border-radius: 8px;
}

.site-footer{
  border-top: 1px solid var(--border);
  padding: 18px 0 26px;
  color: var(--muted);
  position: relative;
  z-index: 1;
}

.footer-inner{
  display:flex;
  justify-content:center;
}

@media (max-width: 860px){
  .hero-inner{grid-template-columns: 1fr; }
  .two-col{grid-template-columns: 1fr;}
  .header-right{gap: 10px;}
  .theme-picker{flex-wrap: wrap;}
}

/* Theme variants (used by script.js) - light palettes, subtle patterns */
body[data-theme="lightblue"]{
  --bg:#e8f2f8;
  --panel:#dceaf4;
  --panel-rgb:220,234,244;
  --text:#1a2632;
  --muted:#4a6a7a;
  --border:rgba(74,159,212,.2);
  --primary:#4a9fd4;
  --primary2:#7eb8d9;
  --primary-rgb:74,159,212;
  --primary2-rgb:126,184,217;
  --pattern-a: repeating-linear-gradient(0deg, rgba(74,159,212,.05) 0 2px, transparent 2px 20px);
  --pattern-b: repeating-radial-gradient(circle at 20% 20%, rgba(126,184,217,.04) 0 4px, transparent 5px 18px);
}

body[data-theme="cream"]{
  --bg:#faf6e8;
  --panel:#f0ead8;
  --panel-rgb:240,234,216;
  --text:#2a2618;
  --muted:#6a6448;
  --border:rgba(180,160,100,.18);
  --primary:#b89664;
  --primary2:#9bc4a8;
  --primary-rgb:184,150,100;
  --primary2-rgb:155,196,168;
  --pattern-a: repeating-linear-gradient(90deg, rgba(184,150,100,.05) 0 2px, transparent 2px 24px);
  --pattern-b: repeating-linear-gradient(0deg, rgba(155,196,168,.04) 0 1px, transparent 1px 18px);
}

body[data-theme="pink"]{
  --bg:#fceef5;
  --panel:#f5e0eb;
  --panel-rgb:245,224,235;
  --text:#2a1a24;
  --muted:#7a5a6a;
  --border:rgba(200,140,180,.2);
  --primary:#c88cb4;
  --primary2:#7eb8d9;
  --primary-rgb:200,140,180;
  --primary2-rgb:126,184,217;
  --pattern-a: repeating-conic-gradient(from 90deg, rgba(200,140,180,.05) 0 8deg, transparent 8deg 22deg);
  --pattern-b: repeating-radial-gradient(circle at 60% 30%, rgba(126,184,217,.04) 0 3px, transparent 4px 20px);
}

body[data-theme="green"]{
  --bg:#e8f5ed;
  --panel:#dceee4;
  --panel-rgb:220,238,228;
  --text:#1a2a20;
  --muted:#4a6a58;
  --border:rgba(80,180,120,.2);
  --primary:#50b478;
  --primary2:#b89664;
  --primary-rgb:80,180,120;
  --primary2-rgb:184,150,100;
  --pattern-a: repeating-linear-gradient(90deg, rgba(80,180,120,.05) 0 1px, transparent 1px 20px);
  --pattern-b: repeating-linear-gradient(0deg, rgba(184,150,100,.04) 0 2px, transparent 2px 22px);
}