/* NoteShuttle design system — tokens are contractual, from docs/website/HANDOFF.md */
:root{
  --ink:#04120E; --ink-2:#082019; --ink-3:#0D2E25; --ink-4:#143D31;
  --paper:#F4FAF7; --card:#FFFFFF; --card-ink:#0A211A;
  --mint:#7CF3C0; --emerald:#12B981; --emerald-2:#0E9F6E; --lime:#C7F464;
  --text:#EAF7F1; --text-dim:#A9C6BB; --text-faint:#7FA297;
  --dark-line:rgba(180,235,214,.14); --light-line:#DCEBE4;
  --danger:#FF6B6B; --warn:#F5B93B; --ok:#12B981;
  --radius:18px; --radius-sm:12px; --radius-lg:26px; --pill:999px;
  --shadow:0 24px 70px rgba(0,0,0,.35);
  --font-display:"Sora",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --maxw:1140px; --gutter:clamp(16px,4.2vw,32px);
  --section-y:clamp(56px,9vw,110px);
}

@font-face{
  font-family:"Sora";
  font-style:normal;
  font-weight:400 800;
  font-display:swap;
  src:url("/assets/fonts/sora-latin.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

*,*::before,*::after{box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{
  margin:0;
  background-color:var(--ink);
  background-image:radial-gradient(110% 62% at 50% -8%,rgba(18,185,129,.09),transparent 62%);
  background-repeat:no-repeat;
  color:var(--text);
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
/* Grain sits in one fixed layer at ~2% so it never competes with text and never
   tiles visibly on long pages. */
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  opacity:.024;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size:160px 160px;
}
main,header,footer{position:relative}
main{z-index:1}

img,svg{display:block}
img{max-width:100%;height:auto;border-style:none}
a{color:inherit}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:-.03em;
  line-height:1.12;
  margin:0;
  color:var(--text);
  text-wrap:balance;
}
h1{font-size:clamp(2.4rem,6.4vw,4.5rem);line-height:1.02;font-weight:700}
h2{font-size:clamp(1.7rem,3.6vw,2.6rem);line-height:1.1}
h3{font-size:1.06rem;line-height:1.3}
::selection{background:var(--mint);color:var(--ink)}

.shell{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:var(--section-y)}
.section-head{max-width:660px;margin-bottom:clamp(30px,4.4vw,48px)}
.section-head h2{margin:10px 0 14px}
.section-head p{color:var(--text-dim);margin:0;max-width:58ch}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin:0;
  font-family:var(--font-display);
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.16em;
  line-height:1.4;
  text-transform:uppercase;
  color:var(--mint);
}
.eyebrow-dot{
  width:7px;height:7px;border-radius:50%;
  background:var(--lime);
  box-shadow:0 0 0 4px rgba(199,244,100,.14);
  flex:none;
}

.sr-only{
  position:absolute !important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:100;
  padding:10px 16px;
  border-radius:var(--pill);
  background:var(--lime);
  color:var(--ink);
  font-weight:600;
  font-size:.9rem;
  text-decoration:none;
  transform:translateY(-160%);
  transition:transform .18s ease;
}
.skip-link:focus{transform:none}

:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  min-height:46px;
  padding:0 22px;
  border:1px solid transparent;
  border-radius:var(--pill);
  font-family:var(--font-display);
  font-size:.92rem;
  font-weight:600;
  letter-spacing:-.01em;
  line-height:1.2;
  text-decoration:none;
  white-space:nowrap;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:var(--mint);color:var(--ink)}
.btn-primary:hover{background:var(--lime)}
.btn-secondary{background:transparent;color:var(--text);border-color:var(--dark-line)}
.btn-secondary:hover{border-color:rgba(124,243,192,.55);color:var(--mint)}
.btn-ghost{background:transparent;color:var(--mint);padding-inline:4px}
.btn-ghost:hover{color:var(--lime)}
.btn-sm{min-height:44px;padding:0 16px;font-size:.84rem}
.btn svg{width:17px;height:17px;flex:none}
.btn-block{width:100%}

/* ---------- surfaces ---------- */
.card{
  background:var(--ink-2);
  border:1px solid var(--dark-line);
  border-radius:var(--radius-lg);
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  min-height:26px;
  padding:2px 10px;
  border:1px solid rgba(124,243,192,.2);
  border-radius:var(--pill);
  background:rgba(124,243,192,.08);
  color:var(--mint);
  font-family:var(--font-display);
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.4;
  text-transform:uppercase;
}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:40;
  background:rgba(4,18,14,.94);
  border-bottom:1px solid var(--dark-line);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:12px;
  min-height:64px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  color:var(--text);
  font-family:var(--font-display);
  font-size:1.05rem;
  font-weight:600;
  letter-spacing:-.02em;
  text-decoration:none;
  flex:none;
}
.brand img{width:30px;height:30px}
.brand span{line-height:1}
.site-nav{
  display:flex;
  align-items:center;
  gap:2px;
  margin-left:auto;
}
.site-nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 14px;
  border-radius:var(--pill);
  color:var(--text-dim);
  font-size:.88rem;
  font-weight:500;
  text-decoration:none;
  transition:color .16s ease,background-color .16s ease;
}
.site-nav a:hover{color:var(--text);background:rgba(124,243,192,.07)}
.header-actions{display:flex;align-items:center;gap:10px;margin-left:8px;flex:none}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  border:1px solid var(--dark-line);
  border-radius:50%;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:5px;
}
.nav-toggle span{
  display:block;
  width:17px;height:1.6px;
  border-radius:2px;
  background:var(--mint);
  transition:transform .2s ease,opacity .2s ease;
}
.site-header.nav-open .nav-toggle span:first-child{transform:translateY(3.3px) rotate(45deg)}
.site-header.nav-open .nav-toggle span:last-child{transform:translateY(-3.3px) rotate(-45deg)}

/* ---------- footer ---------- */
.site-footer{
  margin-top:var(--section-y);
  padding:clamp(40px,6vw,64px) 0 26px;
  background:var(--ink-2);
  border-top:1px solid var(--dark-line);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.55fr repeat(3,1fr);
  gap:clamp(24px,4vw,44px);
}
.footer-brand p{
  max-width:34ch;
  margin:14px 0 18px;
  color:var(--text-dim);
  font-size:.9rem;
}
.footer-grid nav{display:flex;flex-direction:column;align-items:flex-start}
.footer-grid h3{
  margin:0 0 10px;
  color:var(--text-faint);
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
}
.footer-grid nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  color:var(--text-dim);
  font-size:.9rem;
  text-decoration:none;
  transition:color .16s ease;
}
.footer-grid nav a:hover{color:var(--mint)}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  gap:14px 28px;
  flex-wrap:wrap;
  margin-top:clamp(30px,4vw,44px);
  padding-top:22px;
  border-top:1px solid var(--dark-line);
  font-size:.78rem;
  line-height:1.6;
  color:var(--text-faint);
}
.footer-bottom p{margin:0}
.footer-bottom .disclaimer{max-width:620px}

/* ---------- floating download button ---------- */
.dl-fab{
  position:fixed;
  right:max(18px,env(safe-area-inset-right));
  bottom:max(18px,env(safe-area-inset-bottom));
  z-index:60;
  display:grid;
  place-items:center;
  width:68px;height:68px;
  border-radius:50%;
  background:var(--ink-2);
  color:var(--mint);
  text-decoration:none;
  box-shadow:0 18px 44px rgba(0,0,0,.5),0 0 0 1px rgba(180,235,214,.18);
  transition:transform .2s ease,box-shadow .2s ease;
}
.dl-fab:hover{transform:translateY(-2px);box-shadow:0 22px 50px rgba(0,0,0,.55),0 0 0 1px rgba(124,243,192,.4)}
.dl-fab-ring{
  position:absolute;
  inset:-4px;
  border-radius:50%;
  background:conic-gradient(from 0deg,rgba(124,243,192,0) 0deg,rgba(124,243,192,.15) 150deg,var(--emerald) 260deg,var(--lime) 320deg,rgba(199,244,100,0) 360deg);
  -webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 2.5px),#000 calc(100% - 2.4px));
  mask:radial-gradient(farthest-side,transparent calc(100% - 2.5px),#000 calc(100% - 2.4px));
  animation:dl-fab-spin 9s linear infinite;
  pointer-events:none;
}
.dl-fab-play{display:grid;place-items:center;width:28px;height:28px}
.dl-fab-play svg{width:26px;height:26px}
.dl-fab-label{
  position:absolute;
  right:calc(100% + 12px);
  top:50%;
  padding:6px 11px;
  transform:translateY(-50%);
  border:1px solid var(--dark-line);
  border-radius:var(--pill);
  background:var(--ink-3);
  color:var(--text);
  font-family:var(--font-display);
  font-size:.76rem;
  font-weight:600;
  white-space:nowrap;
  opacity:0;
  pointer-events:none;
  transition:opacity .16s ease;
}
.dl-fab:hover .dl-fab-label,.dl-fab:focus-visible .dl-fab-label{opacity:1}
@keyframes dl-fab-spin{to{transform:rotate(1turn)}}

.noscript-note{
  margin-top:14px;
  padding:14px 16px;
  border:1px solid var(--dark-line);
  border-radius:var(--radius-sm);
  background:var(--ink-3);
  color:var(--text-dim);
  font-size:.9rem;
}
.noscript-note a{color:var(--mint)}

/* Reserve room beneath the checker on small screens so the FAB never rests over
   the attendance submit button. */
@media (max-width:560px){
  #attendance-app{padding-bottom:76px}
  .dl-fab{width:58px;height:58px;right:max(14px,env(safe-area-inset-right));bottom:max(14px,env(safe-area-inset-bottom))}
  .dl-fab-play svg{width:23px;height:23px}
  .dl-fab-label{display:none}
  .site-footer{padding-bottom:96px}
}
/* While a form control in the checker has focus (tapping the PIN or submit), the
   button yields the corner completely. */
@supports selector(:has(*)){
  body:has(#attendance-app :focus-within) .dl-fab{
    opacity:0;
    transform:translateY(12px) scale(.9);
    pointer-events:none;
    transition:opacity .18s ease,transform .18s ease;
  }
}

/* ---------- reveal on scroll ---------- */
.reveal{opacity:1;transform:none}
.reveal.reveal-pending{opacity:0;transform:translateY(18px)}
.reveal.is-visible{
  opacity:1;
  transform:none;
  transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.2,1);
}

/* ---------- responsive shell ---------- */
@media (max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:860px){
  .site-nav{
    position:absolute;
    top:100%;
    left:0;right:0;
    display:grid;
    gap:2px;
    margin:0;
    padding:10px var(--gutter) 16px;
    background:var(--ink-2);
    border-bottom:1px solid var(--dark-line);
    box-shadow:0 26px 46px rgba(0,0,0,.4);
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s;
  }
  .site-header.nav-open .site-nav{opacity:1;visibility:visible;transform:none}
  .site-nav a{min-height:50px;padding:0 14px;font-size:1rem;border-radius:var(--radius-sm)}
  .nav-toggle{display:inline-flex}
  .header-actions{margin-left:auto}
}
@media (max-width:760px){
  body{font-size:17px}
  html{scroll-padding-top:76px}
  .header-inner{min-height:60px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px 24px}
  .footer-bottom{flex-direction:column}
}
@media (max-width:560px){
  .header-actions .btn{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-grid nav a{min-height:44px}
}
@media (max-width:380px){
  .footer-grid{grid-template-columns:1fr}
  .brand span{font-size:.98rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal,.reveal.reveal-pending{opacity:1;transform:none}
  .dl-fab-ring{animation:none}
  .btn:hover,.dl-fab:hover{transform:none}
}