:root{
  --ink:#1C2740;
  --ink-60:rgba(28,39,64,.6);
  --ink-30:rgba(28,39,64,.3);
  --ink-12:rgba(28,39,64,.12);
  --ink-06:rgba(28,39,64,.06);
  --paper:#FAFAF8;
  --highlighter:#F2E94E;
  --highlighter-soft:rgba(242,233,78,.45);
  --redpen:#D9442B;
  --green:#2E7D5B;
  --display:"Bricolage Grotesque",sans-serif;
  --body:"Atkinson Hyperlegible",sans-serif;
  --mono:"Spline Sans Mono",monospace;
  --radius:10px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--body);
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.5;
}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer}
:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:2px;
  border-radius:4px;
  box-shadow:0 0 0 5px var(--highlighter-soft);
}

/* ---------- highlighter wordmark ---------- */
.logo{
  font-family:var(--display);
  font-weight:800;
  font-size:1.5rem;
  letter-spacing:-.02em;
  display:inline-block;
  position:relative;
  width:fit-content;
}
.logo::after{
  content:"";
  position:absolute;
  left:-4px;right:-8px;bottom:1px;
  height:9px;
  background:var(--highlighter);
  border-radius:3px 9px 4px 8px/8px 4px 9px 3px;
  transform:skewX(-10deg);
  z-index:-1;
}

/* ---------- app shell ---------- */
.app{display:grid;grid-template-columns:232px 1fr;min-height:100vh}
.rail{
  border-right:1px solid var(--ink-12);
  padding:28px 20px;
  display:flex;
  flex-direction:column;
  gap:36px;
  position:sticky;
  top:0;
  height:100vh;
}
.rail nav{display:flex;flex-direction:column;gap:2px}
.rail nav a, .rail nav button{
  padding:9px 12px;
  border-radius:8px;
  font-weight:700;
  color:var(--ink-60);
  position:relative;
  display:flex;
  align-items:center;
  gap:10px;
  background:none;
  border:none;
  text-align:left;
  width:100%;
}
.rail nav a:hover, .rail nav button:hover{color:var(--ink);background:var(--ink-06)}
.rail nav a[aria-current="page"]{color:var(--ink)}
.rail nav a[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:6px;right:34%;top:7px;bottom:7px;
  background:var(--highlighter);
  border-radius:4px 11px 5px 9px/9px 5px 10px 4px;
  transform:skewX(-9deg);
  z-index:-1;
}
.rail nav .count{
  margin-left:auto;
  font-family:var(--mono);
  font-size:.75rem;
  background:var(--ink);
  color:var(--paper);
  border-radius:99px;
  padding:1px 8px;
}
.rail .foot{
  margin-top:auto;
  font-size:.85rem;
  color:var(--ink-60);
  display:flex;
  flex-direction:column;
  gap:8px;
}
main{padding:32px 40px 56px;max-width:1080px;min-width:0;width:100%}

header.top{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:28px;
}
.top h1{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(1.6rem,3vw,2.1rem);
  letter-spacing:-.02em;
}
.top .date{color:var(--ink-60);margin-top:2px}
.top .profile{display:flex;align-items:center;gap:12px}
.avatar{
  width:40px;height:40px;border-radius:99px;
  background:var(--ink);color:var(--paper);
  display:grid;place-items:center;
  font-family:var(--display);font-weight:700;
  flex-shrink:0;
}

/* ---------- cards & sections ---------- */
section{margin-bottom:36px}
.card{
  border:1px solid var(--ink-12);
  border-radius:var(--radius);
  background:#fff;
  padding:18px 20px;
}
.card + .card{margin-top:20px}
.section-title{
  font-family:var(--display);
  font-weight:700;
  font-size:1.1rem;
  letter-spacing:-.01em;
  margin-bottom:14px;
  display:flex;
  align-items:baseline;
  gap:10px;
}
.section-title a, .section-title .hint{
  font-family:var(--body);
  font-weight:700;
  font-size:.85rem;
  color:var(--ink-60);
  margin-left:auto;
}
.section-title a:hover{color:var(--ink)}
.card .section-title{margin-bottom:10px}
.card > ul{list-style:none}
.eyebrow{
  font-size:.75rem;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.08em;
  color:var(--ink-60);
  margin-bottom:4px;
}
.muted{color:var(--ink-60)}
.small{font-size:.85rem}
.mono{font-family:var(--mono)}
.empty{
  color:var(--ink-30);
  text-align:center;
  padding:18px 0;
}

/* ---------- signature: highlighter stroke ---------- */
.stroke{
  position:relative;
  height:14px;
  background:var(--ink-06);
  border-radius:6px;
  overflow:visible;
}
.stroke .fill{
  position:absolute;
  top:-2px;bottom:-2px;left:0;
  width:var(--w,0%);
  background:var(--highlighter);
  border-radius:4px 12px 5px 10px/11px 5px 12px 4px;
  transform:skewX(-8deg);
  transform-origin:left center;
  animation:draw .9s cubic-bezier(.2,.7,.2,1) both;
}
.stroke .fill::before{
  content:"";
  position:absolute;
  inset:3px -4px -2px 6px;
  background:var(--highlighter);
  opacity:.5;
  border-radius:8px 4px 10px 5px/4px 10px 5px 9px;
}
@keyframes draw{from{width:0}to{width:var(--w)}}
.stroke-row{display:flex;align-items:center;gap:14px}
.stroke-row .stroke{flex:1}
.pct{
  font-family:var(--mono);
  font-weight:600;
  font-size:.95rem;
  min-width:48px;
  text-align:right;
}
.mark{
  background:linear-gradient(104deg,transparent 1%,var(--highlighter-soft) 3% 96%,transparent 98%);
  padding:0 4px;
  border-radius:3px;
}
.crossed{
  color:var(--ink-60);
  text-decoration:line-through;
  text-decoration-color:var(--ink-60);
  text-decoration-thickness:1.5px;
}

/* ---------- buttons & forms ---------- */
.btn{
  background:var(--ink);
  color:var(--paper);
  border:none;
  border-radius:8px;
  padding:12px 22px;
  font-weight:700;
  white-space:nowrap;
}
.btn:hover{background:#2a3a5e}
.btn.small{padding:7px 14px;font-size:.85rem}
.btn.ghost{
  background:none;
  color:var(--ink);
  border:1px solid var(--ink-12);
}
.btn.ghost:hover{background:var(--ink-06)}
.btn.danger{background:none;color:var(--redpen);border:1px solid var(--redpen)}
.btn.danger:hover{background:rgba(217,68,43,.08)}
.btn:disabled{opacity:.5;cursor:default}

label{font-weight:700;font-size:.9rem;display:block;margin-bottom:4px}
input,select,textarea{
  font:inherit;
  color:var(--ink);
  background:#fff;
  border:1px solid var(--ink-30);
  border-radius:8px;
  padding:10px 12px;
  width:100%;
}
textarea{resize:vertical;min-height:80px}
input:focus,select:focus,textarea:focus{
  outline:2px solid var(--ink);
  outline-offset:0;
  box-shadow:0 0 0 5px var(--highlighter-soft);
}
.field{margin-bottom:14px}
form .row{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}
form .row .field{flex:1;margin-bottom:0;min-width:140px}
.form-error{
  color:var(--redpen);
  font-weight:700;
  font-size:.9rem;
  margin-top:10px;
  min-height:1.3em;
}

/* ---------- tables ---------- */
table{width:100%;border-collapse:collapse;font-size:.92rem}
th{
  text-align:left;
  font-size:.75rem;
  text-transform:uppercase;
  letter-spacing:.06em;
  color:var(--ink-60);
  padding:8px 10px 6px;
  border-bottom:1px solid var(--ink-12);
}
td{padding:9px 10px;border-bottom:1px solid var(--ink-06);vertical-align:middle}
tr:last-child td{border-bottom:none}
td.num{font-family:var(--mono);font-weight:600}

/* ---------- badges & rows ---------- */
.badge{
  font-family:var(--mono);
  font-size:.72rem;
  font-weight:600;
  border-radius:99px;
  padding:1px 9px;
  white-space:nowrap;
}
.badge.ink{background:var(--ink);color:var(--paper)}
.badge.red{color:var(--redpen);border:1px solid var(--redpen)}
.badge.green{color:var(--green);border:1px solid var(--green)}
.badge.plain{color:var(--ink-60);border:1px solid var(--ink-12)}
.badge.hl{
  background:var(--highlighter);
  color:var(--ink);
  border-radius:3px 7px 4px 6px/6px 4px 7px 3px;
  transform:skewX(-8deg);
  display:inline-block;
}
.list{list-style:none}
.list li{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:10px 0;
  border-bottom:1px solid var(--ink-06);
}
.list li:last-child{border-bottom:none}
.list .grow{flex:1;min-width:0}
.list .title{font-weight:700;font-size:.95rem}
.list .sub{display:block;font-size:.82rem;color:var(--ink-60)}
.list .end{
  margin-left:auto;
  font-family:var(--mono);
  font-size:.78rem;
  color:var(--ink-60);
  white-space:nowrap;
}
.score{font-family:var(--mono);font-weight:600;font-size:1.05rem}
.score.low{color:var(--redpen)}
.score.high{color:var(--green)}

/* checkbox look for lessons/assignments */
.box{
  width:16px;height:16px;
  border:1.5px solid var(--ink-30);
  border-radius:4px;
  flex-shrink:0;
  align-self:center;
  background:none;
  padding:0;
  position:relative;
}
.box.checked{background:var(--green);border-color:var(--green)}
.box.checked::after{
  content:"";
  position:absolute;
  left:4px;top:1px;
  width:5px;height:9px;
  border:solid var(--paper);
  border-width:0 2px 2px 0;
  transform:rotate(42deg);
}
.box.red{border-color:var(--redpen)}

/* ---------- grids ---------- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
.grid-3{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:20px;align-items:start}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:20px}
.stat{
  border:1px solid var(--ink-12);
  border-radius:var(--radius);
  background:#fff;
  padding:14px 16px;
}
.stat .n{font-family:var(--mono);font-weight:600;font-size:1.6rem}
.stat .l{font-size:.82rem;color:var(--ink-60);font-weight:700}

/* ---------- weekly schedule ---------- */
.week-scroll{overflow-x:auto;padding-bottom:4px}
.week{
  display:grid;
  grid-template-columns:repeat(5,minmax(150px,1fr));
  gap:10px;
  min-width:780px;
}
.day{
  border:1px solid var(--ink-12);
  border-radius:var(--radius);
  background:#fff;
  overflow:hidden;
}
.day-name{
  padding:10px 14px 8px;
  font-weight:700;
  font-size:.9rem;
  border-bottom:1px solid var(--ink-12);
  display:flex;
  align-items:center;
  gap:8px;
  color:var(--ink-60);
}
.day.today{border-color:var(--ink);border-width:1.5px}
.day.today .day-name{color:var(--ink)}
.today-tag{
  font-size:.68rem;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.06em;
  background:var(--highlighter);
  border-radius:3px 7px 4px 6px/6px 4px 7px 3px;
  transform:skewX(-8deg);
  padding:1px 7px;
}
.day ul{list-style:none;padding:10px 12px;display:flex;flex-direction:column;gap:10px;min-height:130px}
.day li .time{
  font-family:var(--mono);
  font-size:.72rem;
  color:var(--ink-60);
  display:block;
}
.day li .class{font-weight:700;font-size:.92rem}
.day li.free{color:var(--ink-30);font-size:.85rem;margin:auto 0;text-align:center}
.day li.past .class{
  color:var(--ink-60);
  text-decoration:line-through;
  text-decoration-color:var(--ink-60);
  text-decoration-thickness:1.5px;
  background:linear-gradient(104deg,transparent 1%,var(--highlighter-soft) 3% 96%,transparent 98%);
  padding:0 4px;
  margin-left:-4px;
  border-radius:3px;
}
.day li.now .class::after{
  content:"now";
  font-family:var(--mono);
  font-size:.66rem;
  font-weight:600;
  color:var(--paper);
  background:var(--ink);
  border-radius:99px;
  padding:1px 7px;
  margin-left:7px;
  vertical-align:2px;
}

/* ---------- banner & toast ---------- */
.banner{
  border:1px solid var(--ink-12);
  border-left:4px solid var(--highlighter);
  background:#fff;
  border-radius:var(--radius);
  padding:12px 16px;
  margin-bottom:24px;
  display:flex;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
}
.toast{
  position:fixed;
  bottom:24px;
  left:50%;
  transform:translateX(-50%);
  background:var(--ink);
  color:var(--paper);
  font-weight:700;
  border-radius:8px;
  padding:11px 20px;
  box-shadow:0 8px 24px rgba(28,39,64,.25);
  z-index:50;
  max-width:90vw;
}
.toast.error{background:var(--redpen)}

/* ---------- auth pages ---------- */
.auth{
  min-height:100vh;
  display:grid;
  place-items:center;
  padding:24px;
}
.auth-card{
  width:100%;
  max-width:420px;
  border:1px solid var(--ink-12);
  border-radius:var(--radius);
  background:#fff;
  padding:32px;
}
.auth-card h1{
  font-family:var(--display);
  font-weight:700;
  font-size:1.4rem;
  letter-spacing:-.01em;
  margin:18px 0 4px;
}
.auth-card .lead{color:var(--ink-60);margin-bottom:20px}
.auth-card .btn{width:100%;margin-top:6px}
.auth-foot{margin-top:18px;font-size:.9rem;color:var(--ink-60)}
.auth-foot a{font-weight:700;color:var(--ink)}
.demo-box{
  margin-top:18px;
  border-top:1px dashed var(--ink-12);
  padding-top:14px;
  font-size:.82rem;
  color:var(--ink-60);
}
.demo-box code{font-family:var(--mono);color:var(--ink)}

/* ---------- landing ---------- */
.landing-nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:22px clamp(20px,5vw,56px);
  max-width:1160px;
  margin:0 auto;
}
.landing-nav .links{display:flex;gap:10px;align-items:center}
.hero{
  max-width:1160px;
  margin:0 auto;
  padding:clamp(32px,8vh,90px) clamp(20px,5vw,56px) 40px;
}
.hero h1{
  font-family:var(--display);
  font-weight:800;
  font-size:clamp(2.1rem,5.5vw,3.6rem);
  letter-spacing:-.03em;
  line-height:1.08;
  max-width:14em;
}
.hero h1 .mark{padding:0 8px}
.hero .lead{
  color:var(--ink-60);
  font-size:clamp(1rem,1.6vw,1.2rem);
  max-width:36em;
  margin:18px 0 28px;
}
.features{
  max-width:1160px;
  margin:0 auto;
  padding:20px clamp(20px,5vw,56px) 80px;
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
}
.feature h3{
  font-family:var(--display);
  font-weight:700;
  font-size:1.05rem;
  margin-bottom:6px;
}
.feature p{color:var(--ink-60);font-size:.92rem}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .grid-3{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr 1fr}
  .features{grid-template-columns:1fr 1fr}
}
@media (max-width:880px){
  .app{grid-template-columns:1fr}
  .rail{
    position:static;
    height:auto;
    flex-direction:row;
    align-items:center;
    gap:18px;
    padding:14px 20px;
    border-right:none;
    border-bottom:1px solid var(--ink-12);
    overflow-x:auto;
  }
  .rail nav{flex-direction:row;gap:4px}
  .rail nav a, .rail nav button{padding:7px 10px;white-space:nowrap;width:auto}
  .rail .foot{display:none}
  main{padding:24px 20px 48px}
}
@media (max-width:640px){
  .grid-2,.grid-3{grid-template-columns:1fr}
  .features{grid-template-columns:1fr}
  header.top{position:relative;flex-direction:column;align-items:flex-start}
  .top .greeting{padding-right:60px}
  .top .profile{position:absolute;top:0;right:0}
}
@media (prefers-reduced-motion:reduce){
  .stroke .fill{animation:none}
  html{scroll-behavior:auto}
}