:root{
  --bg: #0a0a0c;
  --surface: #111114;
  --surface-2: #16161b;
  --line: #1f1f25;
  --line-soft: #161620;
  --ink: #f3f3f5;
  --muted: #b3b3bd;
  --accent: #7656b8;
  --accent-soft: #c8b4f4;
  --accent-ink: #100a1d;
  --accent-line: #2a1f44;
}

*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Trebuchet MS",Verdana,sans-serif;
  display:flex;
  align-items:flex-start;
  justify-content:center;
  padding:34px 6vw;
  position:relative;
  animation:pageFadeIn 280ms ease-out both;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  opacity:.4;
  background-image:radial-gradient(#1a1a22 .7px,transparent .7px);
  background-size:14px 14px;
  -webkit-mask-image:linear-gradient(to bottom,#000,transparent 80%);
  mask-image:linear-gradient(to bottom,#000,transparent 80%);
  z-index:0;
}

.container{width:100%;max-width:1100px;margin:0 auto;position:relative}
.hero{background:transparent;padding:30px 0 42px;margin:0;overflow:hidden}
.hero-inner{position:relative;z-index:1;max-width:1100px;margin:0 auto}
.hero-text{max-width:720px}
.hero h1{
  margin:0;
  font-family:Georgia,serif;
  font-size:clamp(3.8rem,10vw,8rem);
  letter-spacing:0;
  color:var(--ink);
  line-height:.8;
  font-weight:400;
}

.quicklinks{
  display:flex;
  flex-direction:row;
  align-items:center;
  gap:8px;
  padding:14px 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  position:relative;
  z-index:2;
}
.quicklinks .link{
  background:transparent;
  border:0;
  padding:8px 11px;
  color:var(--ink);
  cursor:pointer;
  font-size:.78rem;
  text-transform:uppercase;
  letter-spacing:.08em;
  text-decoration:none;
  transition:background .15s,color .15s;
}
.quicklinks .link:hover{background:var(--surface-2);color:var(--accent-soft)}
.quicklinks a{text-decoration:none}
.auth-area{display:flex;align-items:center;margin-right:auto;font-size:.78rem;color:var(--muted);gap:8px}

.intro-page{max-width:880px;margin:0 auto;padding:110px 0 70px;text-align:left}
.eyebrow{color:var(--accent-soft);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;font-weight:700;margin:0 0 18px}
.intro-page h2,.content-page h2{
  font-family:Georgia,serif;
  font-weight:400;
  color:var(--ink);
  letter-spacing:0;
}
.intro-page h2{font-size:clamp(3rem,8vw,7rem);line-height:1;margin:0 0 22px;max-width:820px}
.lede{max-width:570px;color:var(--muted);font-size:1.1rem;line-height:1.7;margin:0}
.content-page .lede{margin-bottom:46px}

.page-links{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--bg);
  border:1px solid var(--line);
  margin-top:48px;
}
.page-links a{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  min-height:175px;
  padding:18px;
  text-align:center;
  text-decoration:none;
  color:var(--ink);
  border:0;
  background:var(--surface);
  transition:background .2s,color .2s;
}
.page-links a:hover{background:var(--surface-2);color:var(--accent-soft)}
.page-links strong{font-size:1.2rem;}
.page-links small{color:var(--muted);margin-top:7px}
.nda-link{color:var(--accent-soft)!important}

.content-page{position:relative;max-width:900px;padding:56px 0 60px}
.back-link{color:var(--accent-soft);text-decoration:none;font-weight:700}
.video-navigation{position:absolute;top:56px;right:24px;display:flex;align-items:flex-start;gap:8px;z-index:3}
.video-day-group{position:relative;display:flex;}
.video-day-button,.video-topic-button{border:1px solid var(--line);background:var(--surface);color:var(--muted);padding:8px 11px;font:600 .78rem/1.1 system-ui,sans-serif;cursor:pointer;transition:background .2s,color .2s,border-color .2s}
.video-day-button:hover,.video-day-button.active,.video-topic-button:hover,.video-topic-button.active{background:var(--accent);border-color:var(--accent);color:#fff}
.video-topic-list{position:absolute;top:100%;left:0;display:flex;flex-direction:column;align-items:stretch;gap:5px;min-width:150px;padding:8px;background:var(--surface-2);border:1px solid var(--line);box-shadow:0 12px 26px rgba(0,0,0,.24);opacity:0;visibility:hidden;transform:translateY(-6px);pointer-events:none;transition:opacity .22s ease,transform .22s ease,visibility 0s linear .22s}
.video-day-group[data-active="true"]:hover .video-topic-list,.video-day-group[data-active="true"]:focus-within .video-topic-list{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto;transition-delay:0s}
.video-topic-button{text-align:left;white-space:nowrap}
.content-page h2{font-size:clamp(3rem,7vw,6rem);line-height:1;margin:42px 0 20px}
.info-block{border-top:1px solid var(--line);padding:22px 0}
.info-block h3{margin:0 0 8px;font-family:Georgia,serif;font-size:1.5rem;font-weight:400}
.info-block p{color:var(--muted);line-height:1.7;margin:0;max-width:620px}
.form-page{max-width:620px}
.nda-form{display:grid;gap:20px;margin-top:34px}
.nda-form label{display:grid;gap:7px;color:var(--muted);font-size:.9rem}
.nda-form input{width:100%;padding:13px;background:var(--surface-2);border:1px solid var(--line);color:var(--ink);font:inherit}
.nda-form input:focus{outline:2px solid var(--accent);outline-offset:2px}
.nda-form button{
  justify-self:start;
  padding:13px 18px;
  background:var(--accent-soft);
  border:0;
  color:var(--accent-ink);
  font:700 .85rem "Trebuchet MS",Verdana,sans-serif;
  text-transform:uppercase;
  letter-spacing:.06em;
  cursor:pointer;
}
.form-status{min-height:1.3em;color:var(--accent-soft)}

.sections{display:flex;flex-direction:column;gap:18px}
.section{
  display:flex;
  gap:18px;
  align-items:flex-start;
  padding:18px;
  border:1px solid var(--line);
  background:var(--surface);
  opacity:0;
  transform:translateY(12px);
  animation:fadeIn .5s forwards;
  transition:transform .22s ease, box-shadow .22s ease, margin-bottom .22s ease, background .22s ease;
}
.sections .section:nth-of-type(1){animation-delay:0.06s}
.sections .section:nth-of-type(2){animation-delay:0.12s}
.sections .section:nth-of-type(3){animation-delay:0.18s}
.section .text{flex:1}
.section .media{width:180px;display:flex;align-items:flex-start;justify-content:flex-end}
.custom-player-wrapper{position:relative;width:100%;border-radius:8px;overflow:hidden;background:#050505;border:1px solid var(--line-soft);display:flex;justify-content:center;}
.video-watermark{position:absolute;right:14px;bottom:58px;z-index:2;pointer-events:none;color:rgba(255,255,255,.58);font:600 .7rem/1.2 system-ui,sans-serif;letter-spacing:.08em;text-transform:uppercase;text-shadow:0 1px 3px #000;user-select:none;}
.custom-player-wrapper:fullscreen{width:100vw!important;height:100vh!important;border-radius:0;border:none;align-items:center;background:#000;}
.custom-player-wrapper:-webkit-full-screen{width:100vw!important;height:100vh!important;border-radius:0;border:none;align-items:center;background:#000;}
.custom-player-wrapper:fullscreen .video-player{max-height:100%!important;height:100%!important;}
.custom-player-wrapper:-webkit-full-screen .video-player{max-height:100%!important;height:100%!important;}
.video-player{display:block;width:100%;max-width:100%;height:auto;max-height:68vh;object-fit:contain;background:#050505;}
.big-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:76px;height:76px;background:rgba(118,86,184,0.9);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .2s,background .2s;z-index:2;box-shadow:0 8px 24px rgba(118,86,184,0.3);}
.big-play-btn:hover{transform:translate(-50%,-50%) scale(1.08);background:var(--accent);}
.big-play-btn svg{width:38px;height:38px;margin-left:6px;}
.player-controls{position:absolute;bottom:0;left:0;right:0;padding:50px 24px 20px;background:linear-gradient(transparent,rgba(0,0,0,0.9));display:flex;align-items:center;gap:18px;opacity:0;transition:opacity .3s;z-index:2;}
.custom-player-wrapper:hover .player-controls{opacity:1;}
.play-pause-btn,.fullscreen-btn{background:transparent;border:none;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;opacity:0.85;transition:opacity .2s;}
.play-pause-btn:hover,.fullscreen-btn:hover{opacity:1;}
.play-pause-btn svg,.fullscreen-btn svg{width:28px;height:28px;}
.progress-container{flex:1;height:24px;display:flex;align-items:center;cursor:pointer;}
.progress-bar{width:100%;height:6px;background:rgba(255,255,255,0.25);border-radius:3px;overflow:hidden;}
.progress-filled{width:0%;height:100%;background:var(--accent);border-radius:3px;}
.time-display{color:#fff;font-size:0.85rem;font-variant-numeric:tabular-nums;font-weight:600;}
.mute-btn{background:transparent;border:none;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;opacity:.85;}
.mute-btn:hover{opacity:1;}
.mute-btn svg{width:24px;height:24px;}
.volume-slider{width:80px;accent-color:var(--accent);cursor:pointer;}
.video-section{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);padding:24px;border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,0.2);margin-bottom:24px}
.video-section h3{margin:0 0 16px;font-family:Georgia,serif;font-size:1.8rem;font-weight:400;color:var(--ink)}
.section.alt{flex-direction:row-reverse}
.card{padding:14px;border-radius:6px;background:var(--surface);color:var(--muted)}

.upload{display:inline-block;margin-top:12px;background:var(--surface);padding:8px 12px;border-radius:6px;cursor:pointer;border:1px solid var(--line)}
.upload input{display:none}
.uploads-list{margin-top:12px;color:var(--muted);font-size:.95rem}
.file-item{padding:6px 0;border-top:1px dashed var(--line-soft)}
.open-new{display:inline-block;margin-left:12px;padding:6px 10px;background:var(--surface);border:1px solid var(--line);color:var(--muted);cursor:pointer}

.section:hover{transform:translateY(-6px);box-shadow:0 8px 20px rgba(0,0,0,0.5)}
.section h2{cursor:pointer}
.section.expanded{margin-bottom:80px;background:var(--surface-2);border-color:var(--line)}

.submission-panel{
  margin-top:42px;
  padding:28px;
  background:var(--surface);
  border:1px solid var(--line);
  color:var(--ink);
  display:grid;
  gap:16px;
  grid-template-columns:1fr auto;
  align-items:center;
}
.submission-panel .eyebrow{color:var(--accent-soft)}
.submission-panel p{color:var(--muted);margin:6px 0 0}
.submission-panel h3{margin:0;font-family:Georgia,serif;font-size:2rem;font-weight:400}

.button,.upload-button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:46px;
  padding:0 18px;
  border:1px solid var(--line);
  font:700 .78rem "Trebuchet MS",Verdana,sans-serif;
  text-transform:uppercase;
  letter-spacing:.06em;
  text-decoration:none;
  cursor:pointer;
  transition:background .15s,color .15s,border-color .15s;
}
.button{background:transparent;color:var(--ink)}
.button:hover{border-color:var(--accent);color:var(--accent-soft)}
.button-dark{color:var(--ink);border-color:var(--ink)}
.button-dark:hover{color:var(--accent-soft);border-color:var(--accent-soft)}
.upload-button{background:var(--accent-soft);color:var(--accent-ink);border-color:var(--accent)}
.upload-button:hover{background:var(--accent);color:var(--ink)}
.upload-button input{display:none}

.homework-images{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:28px 0}
.homework-images img{width:100%;aspect-ratio:4/3;object-fit:cover;background:var(--surface-2);border:1px solid var(--line)}
.file-drop{
  display:grid;
  gap:8px;
  padding:34px;
  border:1px dashed var(--accent-line);
  background:var(--surface);
  cursor:pointer;
}
.file-drop small{color:var(--muted)}
.file-icon{font-size:2rem;color:var(--accent-soft)}

.grade-card{
  margin-top:24px;
  padding:24px;
  background:var(--surface);
  border:1px solid var(--line);
  display:grid;
  gap:18px;
  grid-template-columns:auto 1fr;
  align-items:start;
}
.grade-card .grade-tier{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  width:84px;
  height:84px;
  border:1px solid var(--accent);
  border-radius:18px;
  color:var(--accent-soft);
  font-family:Georgia,"Times New Roman",serif;
  font-size:2rem;
  line-height:1;
  overflow:hidden;
  background:var(--surface-2);
}
.grade-card .grade-tier .grade-avatar{
  width:52px;
  height:52px;
  border-radius:50%;
  object-fit:cover;
  display:block;
  border:2px solid var(--accent-soft);
  box-shadow:0 0 12px rgba(124,58,237,0.38);
}
.grade-card .grade-tier small{
  margin-top:6px;
  font:600 .65rem system-ui,sans-serif;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--muted);
}
.grade-card .grade-body{display:grid;gap:8px}
.grade-card .grade-body .grade-avatar{
  width:32px;
  height:32px;
  border-radius:50%;
  object-fit:cover;
  padding:2px;
  background:linear-gradient(135deg,var(--accent,#7c3aed),#a855f7,#ec4899);
  box-shadow:0 0 12px rgba(124,58,237,.5);
  display:block;
}
.grade-card .grade-body .grade-avatar-fallback{
  color:#fff;
  font:600 14px/28px system-ui,sans-serif;
  text-align:center;
}
.grade-card .submission-images{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:10px;
  margin-top:8px;
}
.grade-card .submission-image{
  width:100%;
  max-height:360px;
  aspect-ratio:4/3;
  object-fit:cover;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--surface-2);
}
.grade-card .grade-row{display:flex;gap:14px;flex-wrap:wrap;align-items:baseline;color:var(--muted);font-size:.9rem}
.grade-card .grade-row strong{color:var(--ink);font-weight:600}
.grade-card .grade-feedback{margin:6px 0 0;color:var(--ink);line-height:1.65;max-width:60ch;white-space:pre-wrap}
.grade-card .grade-empty{color:var(--muted);font-size:.95rem;line-height:1.6}
.grade-card .grade-empty .eyebrow{margin-bottom:6px}

.discord-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:34px;
  height:34px;
  border-radius:50%;
  background:var(--surface-2);
  border:1px solid var(--line);
  margin-left:10px;
}
.discord-btn img{width:17px;height:17px;object-fit:contain}
.discord-btn:hover{box-shadow:0 8px 24px rgba(124,58,237,0.18)}

.logout-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:34px;
  padding:0 14px;
  border-radius:17px;
  background:var(--surface-2);
  border:1px solid var(--line);
  color:var(--muted);
  font-size:.75rem;
  text-transform:uppercase;
  letter-spacing:.06em;
  text-decoration:none;
  transition:background .15s,color .15s,border-color .15s,box-shadow .15s;
  margin-left:10px;
}
.logout-btn:hover{
  background:var(--surface);
  color:var(--accent-soft);
  border-color:var(--accent-line);
  box-shadow:0 8px 24px rgba(118,86,184,0.15);
}

@keyframes fadeIn{to{opacity:1;transform:none}}
@keyframes pageFadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

@media (prefers-reduced-motion:reduce){
  body{animation:none}
  body::before{opacity:0}
  .section{animation:none;opacity:1;transform:none}
  .section:hover{transform:none}
  .video-topic-list{transition:none}
}

@media (max-width:820px){
  .video-navigation{position:static;flex-wrap:wrap;margin:24px 0 30px}
  .video-topic-list{right:auto;left:0}
  .section{flex-direction:column}
  .section.alt{flex-direction:column}
  .media{width:100%}
  .quicklinks{flex-wrap:wrap}
  .intro-page{padding-top:50px}
  .page-links{grid-template-columns:repeat(2,1fr)}
  .submission-panel{grid-template-columns:1fr}
  .homework-images{grid-template-columns:1fr 1fr}
}

@media (max-width:560px){
  .grade-card{grid-template-columns:1fr}
  .grade-card .grade-tier{width:72px;height:72px;font-size:1.7rem}
}

@media (max-width:480px){
  .page-links{grid-template-columns:1fr}
  .homework-images{grid-template-columns:1fr}
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  padding: 2px;
  background: linear-gradient(135deg, var(--accent, #7c3aed), #a855f7, #ec4899);
  box-shadow: 0 0 12px rgba(124, 58, 237, 0.5);
  display: block;
  transition: box-shadow .2s, transform .2s;
}
.user-avatar:hover {
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.7);
  transform: scale(1.08);
}