@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');

@font-face{
  font-family:'Codec Pro';
  src:url('/static/fonts/codec-pro.regular.ttf') format('truetype');
  font-weight:400 700;
  font-style:normal;
  font-display:swap;
}

:root{
  --bg-void:#000000;
  --bg-1:#030304;
  --bg-2:#060608;
  --bg-3:#0a0a0d;
  --accent:#ffffff;
  --accent-2:#9a9a9a;
  --accent-soft:rgba(255,255,255,0.14);
  --text:#f4f6f8;
  --text-dim:#a6afbc;
  --text-mute:#6d7686;
  --line:rgba(255,255,255,0.09);
  --line-strong:rgba(255,255,255,0.18);
  --font-display:'Codec Pro','Space Grotesk',sans-serif;
  --font-body:'Codec Pro','Space Grotesk',sans-serif;
  --font-mono:'Codec Pro','Space Grotesk',sans-serif;
  --nav-h:76px;
}

*{margin:0;padding:0;box-sizing:border-box;}

html{scroll-behavior:smooth;}

body{
  font-family:var(--font-body);
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(120,120,120,0.04), transparent 60%),
    radial-gradient(1000px 700px at 90% 10%, rgba(255,255,255,0.03), transparent 55%),
    linear-gradient(165deg, var(--bg-void) 0%, var(--bg-1) 35%, var(--bg-2) 70%, var(--bg-3) 100%);
  background-attachment:fixed;
  min-height:100vh;
  overflow-x:hidden;
  line-height:1.6;
}

#bg-canvas{
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
}

a{color:inherit;text-decoration:none;}
img,svg{display:block;max-width:100%;}
::selection{background:var(--accent);color:#06070a;}

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:2px;
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:0.75rem;
  letter-spacing:0.18em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:1rem;
  display:inline-block;
}

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:500;
  letter-spacing:-0.02em;
  line-height:1.1;
}

p{color:var(--text-dim);font-weight:400;}

.reveal{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .7s cubic-bezier(.22,.61,.36,1), transform .7s cubic-bezier(.22,.61,.36,1);
}
.reveal.in-view{opacity:1;transform:none;}
.reveal.d1{transition-delay:.08s;}
.reveal.d2{transition-delay:.16s;}
.reveal.d3{transition-delay:.24s;}

@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1 !important;transform:none !important;transition:none !important;}
}

/* ---------- Navbar ---------- */
#navbar{
  position:sticky;
  top:0;
  z-index:100;
  width:100%;
  height:var(--nav-h);
  background:rgba(0,0,0,0.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
}

.nav-inner{
  width:100%;
  max-width:none;
  height:var(--nav-h);
  margin:0;
  padding:0 1.75rem;
  display:flex;
  align-items:center;
  justify-content:flex-start;
  gap:1.25rem;
  box-sizing:border-box;
}

.brand{
  display:flex;
  align-items:center;
  gap:0.65rem;
}
.brand-mark{width:26px;height:26px;}
.brand-name{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:0.02em;
  font-size:1rem;
}
.brand-sub{
  color:var(--text-mute);
  font-size:0.78rem;
  margin-left:0.15rem;
}

.nav-right{
  display:flex;
  align-items:center;
  gap:1.25rem;
  flex:1;
  min-width:0;
}

.nav-link{
  font-size:0.92rem;
  color:var(--text-dim);
  transition:color .2s ease;
}
.nav-link:hover{color:var(--text);}

#navbar .nav-link svg,
#navbar .nav-logout svg{
  width:20px;
  height:20px;
  max-width:20px;
  flex-shrink:0;
}

.nav-account{
  display:flex;
  align-items:center;
  gap:0.85rem;
  margin-left:auto;
  flex-shrink:0;
}

.nav-logout{
  display:flex;
  align-items:center;
  gap:0.45rem;
}

.profile{
  display:flex;
  align-items:center;
  gap:0.75rem;
  color:var(--text-dim);
  font-size:0.9rem;
}

/* ---------- Layout ---------- */
.page{
  position:relative;
  z-index:1;
  max-width:1180px;
  margin:0 auto;
  padding:3rem 1.75rem 5rem;
}

.hero{
  margin-bottom:3rem;
  padding-bottom:2rem;
  border-bottom:1px solid var(--line);
}
.hero h1{
  font-size:clamp(2.2rem, 5vw, 3.6rem);
  margin-bottom:0.65rem;
}
.tagline{
  font-family:var(--font-display);
  color:var(--accent);
  font-weight:500;
  margin-bottom:0.85rem;
}
.hero p{max-width:52ch;font-size:1.05rem;}

.actions{
  display:flex;
  flex-wrap:wrap;
  gap:0.85rem;
  margin-top:1.75rem;
}

.section-title{
  font-size:clamp(1.35rem, 2.5vw, 1.85rem);
  margin-bottom:1.5rem;
}

.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:1.25rem;
}

.card{
  border:1px solid var(--line);
  border-radius:16px;
  padding:1.6rem;
  background:rgba(255,255,255,0.015);
  transition:border-color .25s ease, transform .25s ease, background .25s ease;
}
.card:hover{
  border-color:rgba(255,255,255,0.35);
  transform:translateY(-4px);
  background:rgba(255,255,255,0.03);
}
.card h3{
  font-size:1.15rem;
  margin-bottom:0.55rem;
}
.card p{font-size:0.92rem;}

.card-actions{
  margin-top:1.25rem;
}

.card .btn-primary,
.card .btn-ghost{
  width:100%;
}

.empty{color:var(--text-mute);padding:0.5rem 0 1rem;}

/* ---------- Buttons ---------- */
.btn-primary,.btn-ghost,button.btn-primary,button.btn-ghost{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:0.85rem 1.6rem;
  border-radius:999px;
  font-size:0.95rem;
  font-weight:500;
  font-family:inherit;
  cursor:pointer;
  border:none;
  transition:transform .2s ease, filter .2s ease, border-color .2s ease, color .2s ease;
}
.btn-primary{
  background:linear-gradient(120deg, var(--accent), var(--accent-2));
  color:#06070a;
}
.btn-primary:hover{transform:translateY(-2px);filter:brightness(1.08);}
.btn-ghost{
  border:1px solid var(--line-strong);
  color:var(--text);
  background:transparent;
}
.btn-ghost:hover{
  border-color:var(--accent);
  color:var(--accent);
  transform:translateY(-2px);
}

/* ---------- Avatars ---------- */
.avatar{
  width:42px;height:42px;
  border-radius:50%;
  background:var(--accent);
  color:#111;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  flex-shrink:0;
}
.avatar-wrap{
  position:relative;
  display:inline-flex;
  margin-bottom:1rem;
}
.avatar-wrap-sm{margin-bottom:0;}
.avatar-img{
  width:56px;height:56px;
  border-radius:50%;
  object-fit:cover;
  border:1px solid var(--line-strong);
  background:rgba(255,255,255,.06);
}
.avatar-wrap-sm .avatar-img,
.avatar-wrap-sm .avatar{
  width:42px;height:42px;
}
.student-card .avatar{
  width:56px;height:56px;font-size:1.1rem;
}
.is-hidden{display:none !important;}

/* ---------- Forms ---------- */
.form-shell{
  max-width:640px;
  width:100%;
}

.lesson-layout{
  display:grid;
  grid-template-columns:1fr minmax(300px, 420px);
  gap:3rem;
  align-items:start;
}

.lesson-layout-left{
  grid-template-columns:minmax(580px, 1fr) minmax(160px, 220px);
  gap:1.75rem;
  align-items:stretch;
}

.lesson-copy.hero{
  margin-bottom:0;
  padding-bottom:0;
  border-bottom:none;
  position:sticky;
  top:calc(var(--nav-h) + 1.5rem);
}

.lesson-form{
  margin-left:0;
  max-width:none;
}

.lesson-form-compact{
  padding:1.25rem 1.5rem 1.5rem;
  border:1px solid var(--line);
  background:linear-gradient(165deg, rgba(255,255,255,0.02) 0%, rgba(255,255,255,0.005) 100%);
}

.lesson-form:hover,
.lesson-form-compact:hover{
  transform:none;
  border-color:var(--line-strong);
}

.page-compact{
  padding-top:2rem;
  padding-bottom:3rem;
}

.form-heading{
  margin-bottom:1.5rem;
  padding-bottom:1.25rem;
  border-bottom:1px solid var(--line);
}

.form-heading .eyebrow{
  margin-bottom:0.6rem;
  color:var(--accent-2);
}
.form-heading h1{
  font-size:clamp(1.5rem, 2.5vw, 1.9rem);
  margin:0;
}

.form-grid-compact{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(130px, 1fr));
  gap:0.8rem 1rem;
  align-items:start;
}

.form-grid-compact .field label{
  margin-bottom:0.45rem;
  font-size:0.75rem;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.form-grid-compact .field input,
.form-grid-compact .field select{
  margin-bottom:0;
  padding:0.7rem 0.85rem;
  font-size:0.92rem;
  width:100%;
  min-width:0;
}

.form-grid-compact .field-wide{
  grid-column:1 / -1;
  min-width:0;
  margin-top:0.75rem;
}

.form-grid-compact .field:nth-child(1),
.form-grid-compact .field:nth-child(2){
  grid-column:span 2;
}

@media(max-width:768px){
  .form-grid-compact .field:nth-child(1),
  .form-grid-compact .field:nth-child(2){
    grid-column:span 1;
  }
}

.form-hint-inline{
  margin-top:2rem;
  margin-bottom:2rem;
  font-size:0.8rem;
  line-height:1.4;
}

.form-actions-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:1rem 1.25rem;
  margin-top:0.5rem;
}

.form-actions-row .btn-primary{
  margin-left:auto;
  padding:0.7rem 1.5rem;
  font-size:0.9rem;
  flex-shrink:0;
}

.exclude-summary{
  color:var(--text-mute);
  font-size:0.8rem;
  margin-left:0.5rem;
}

.btn-exclude{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:0.85rem 1.6rem;
  border-radius:999px;
  font-size:0.95rem;
  font-weight:500;
  font-family:inherit;
  cursor:pointer;
  border:1px solid var(--line-strong);
  color:var(--text);
  background:transparent;
  transition:transform .2s ease, filter .2s ease, border-color .2s ease, color .2s ease;
}
.btn-exclude:hover{
  border-color:var(--accent);
  color:var(--accent);
  transform:translateY(-2px);
}

.lesson-aside{
  border:1px solid var(--line);
  border-radius:16px;
  padding:1.5rem;
  background:linear-gradient(165deg, rgba(255,255,255,0.025) 0%, rgba(255,255,255,0.01) 100%);
  align-self:start;
  position:sticky;
  top:calc(var(--nav-h) + 1rem);
}

.lesson-aside .tagline{
  margin-bottom:0.75rem;
  color:var(--accent);
}

.lesson-aside p:last-child{
  font-size:0.9rem;
  line-height:1.5;
}

body.modal-open{overflow:hidden;}

.modal-backdrop{
  position:fixed;
  inset:0;
  z-index:200;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:1.25rem;
  background:rgba(0,0,0,0.72);
  backdrop-filter:blur(8px);
}

.modal-card{
  width:min(600px, 100%);
  max-height:min(80vh, 640px);
  overflow:auto;
  border:1px solid var(--line-strong);
  border-radius:18px;
  padding:1.5rem 1.75rem 1.5rem;
  background:linear-gradient(165deg, #0c0c0f 0%, #050506 100%);
  box-shadow:0 24px 80px rgba(0,0,0,0.55);
}

.modal-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  margin-bottom:0.5rem;
}

.modal-header h2{
  font-size:1.35rem;
  margin:0;
  color:var(--accent);
}

.modal-close{
  width:36px;
  height:36px;
  border:1px solid var(--line);
  border-radius:999px;
  background:transparent;
  color:var(--text);
  font-size:1.4rem;
  line-height:1;
  cursor:pointer;
}

.modal-close:hover{border-color:var(--accent);}

.modal-lead{
  font-size:0.92rem;
  margin-bottom:1rem;
  color:var(--text-dim);
  line-height:1.5;
}

.modal-actions{
  display:flex;
  justify-content:flex-end;
  margin-top:1.25rem;
  padding-top:1rem;
  border-top:1px solid var(--line);
}

.modal-card .exclude-list{
  max-height:min(45vh, 400px);
  margin-top:0.5rem;
}

.modal-search{
  margin-bottom:1rem;
}
.modal-search input{
  width:100%;
  padding:0.7rem 0.85rem;
  background:rgba(0,0,0,.4);
  border:1px solid var(--line);
  border-radius:10px;
  color:var(--text);
  font-size:0.9rem;
  font-family:inherit;
}
.modal-search input:focus{
  outline:none;
  border-color:var(--line-strong);
}
.modal-search input::placeholder{
  color:var(--text-mute);
}

.form-shell label{
  display:block;
  margin-bottom:0.45rem;
  color:var(--text-mute);
  font-size:0.82rem;
  font-family:var(--font-mono);
  letter-spacing:0.06em;
  text-transform:uppercase;
}
.form-shell input,
.form-shell select,
.form-shell textarea{
  width:100%;
  padding:0.9rem 1rem;
  margin-bottom:1.15rem;
  background:rgba(0,0,0,.45);
  border:1px solid var(--line);
  border-radius:12px;
  color:var(--text);
  font-size:1rem;
  font-family:inherit;
}
.form-shell textarea{min-height:110px;resize:vertical;}
.form-shell input:focus,
.form-shell select:focus,
.form-shell textarea:focus{
  outline:none;
  border-color:var(--line-strong);
}

.form-hint{
  display:block;
  margin-top:-0.7rem;
  margin-bottom:1.15rem;
  font-size:0.82rem;
  color:var(--text-mute);
}

.inline-form{display:inline;}

.manage-grid{
  display:grid;
  grid-template-columns:minmax(240px,340px) 1fr;
  gap:1.25rem;
  align-items:start;
}

.exclude-list{
  max-height:320px;
  overflow:auto;
  border:1px solid var(--line);
  border-radius:12px;
  padding:0.4rem;
  background:rgba(0,0,0,.35);
}

.exclude-row{
  display:flex;
  gap:0.85rem;
  align-items:center;
  padding:0.5rem 0.75rem;
  border-radius:10px;
  cursor:pointer;
  text-transform:none;
  letter-spacing:0;
  font-family:var(--font-body);
  font-size:0.88rem;
  color:var(--text);
  margin:0;
  border:1px solid transparent;
  transition:border-color .2s ease, background .2s ease;
  justify-content:flex-start;
  flex-wrap:nowrap;
  width:100%;
}

.exclude-row:hover{
  background:rgba(255,255,255,.04);
  border-color:var(--line);
}
.exclude-row input:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
.exclude-row input{
  appearance:none;
  -webkit-appearance:none;
  width:20px;height:20px;
  border:2px solid var(--line);
  border-radius:5px;
  background:rgba(0,0,0,.4);
  cursor:pointer;
  flex-shrink:0;
  margin:0;
  margin-left:auto;
  position:relative;
  transition:border-color .2s ease, background .2s ease;
  order:3;
}
.exclude-row input:checked{
  border-color:var(--accent);
  background:var(--accent);
}
.exclude-row input:checked::after{
  content:'';
  position:absolute;
  top:50%;left:50%;
  transform:translate(-50%, -50%);
  width:10px;height:6px;
  border-left:2px solid #111;
  border-bottom:2px solid #111;
  rotate:-45deg;
  margin-top:-2px;
}
.exclude-avatar{
  width:32px;height:32px;
  border-radius:50%;
  overflow:hidden;
  flex-shrink:0;
  background:linear-gradient(135deg, var(--accent), var(--accent-2));
  color:#111;
  border:1px solid var(--line);
  order:1;
}
.exclude-avatar img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.avatar-fallback{
  width:100%;height:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:600;
  font-size:0.85rem;
  text-transform:uppercase;
}
.exclude-row span{
  display:flex;
  flex-direction:column;
  gap:0.05rem;
  flex:1;
  min-width:0;
  text-align:left;
  flex-shrink:1;
  order:2;
}
.exclude-row small{
  color:var(--text-mute);
  font-size:0.72rem;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

.lesson-form .exclude-list{margin-bottom:0.5rem;}
.checkbox-option{display:flex;align-items:flex-start;gap:0.7rem;cursor:pointer;line-height:1.35;}
.checkbox-option input{width:auto;margin-top:0.2rem;accent-color:var(--accent, #62d8d1);}
.checkbox-option strong,.checkbox-option small{display:block;}
.checkbox-option small{margin-top:0.2rem;opacity:0.72;}

@media(max-width:900px){
  .manage-grid{grid-template-columns:1fr;}
}
.time-row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:1rem;
}

/* ---------- Login ---------- */
.login-wrap{
  position:relative;
  z-index:1;
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:2.5rem 1.5rem;
}
.login-box{
  text-align:center;
  max-width:480px;
  border:1px solid var(--line);
  border-radius:18px;
  padding:3rem 2.2rem;
  background:linear-gradient(160deg, rgba(255,255,255,0.03), rgba(255,255,255,0));
}
.login-box .brand-mark{
  width:64px;height:64px;
  margin:0 auto 1.25rem;
  filter:drop-shadow(0 0 28px rgba(255,255,255,0.12));
}
.login-box h1{
  font-size:clamp(2rem, 5vw, 2.8rem);
  margin-bottom:0.4rem;
}
.login-box .tagline{margin-bottom:1.2rem;}
.login-box p{margin-bottom:2rem;}

@media(max-width:700px){
  .page{padding:2rem 1.25rem 4rem;}
  .nav-inner{padding:0 1.25rem;}
  .brand-sub{display:none;}
  .profile span{display:none;}
  .time-row{grid-template-columns:1fr;}
  .lesson-layout,
  .lesson-layout-left{
    grid-template-columns:1fr;
    gap:1.25rem;
  }
  .lesson-copy.hero{
    position:static;
  }
  .lesson-form{
    margin-left:0;
    max-width:none;
  }
  .form-grid-compact{
    grid-template-columns:1fr 1fr;
  }
  .form-actions-row .btn-primary{
    margin-left:0;
    width:100%;
  }
}