:root{
    --board: #c9a876;
    --board-dark: #2e2013;
    --paper: #fffdf6;
    --paper-dim: #f3e9d7;
    --ink: #3b2e1f;
    --ink-soft: #7a6a52;
    --yellow: #f0b429;
    --coral: #d9503f;
    --blue: #6fa8c9;
    --mint: #7fb88f;
    --lilac: #b79fd9;
    --chalk: #fffdf6;
    --radius: 6px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--board);
    color:var(--ink);
    font-family:'Quicksand', sans-serif;
    line-height:1.5;
  }
  h1,h2,h3, .hand{
    font-family:'Shadows Into Light', cursive;
    font-weight:700;
  }
  a{color:inherit;}
  img{max-width:100%;}

  /* faint cork-grain texture */
  .board-bg{
    background-image:
      radial-gradient(circle at 15% 25%, rgba(0,0,0,0.05) 0, transparent 3px),
      radial-gradient(circle at 65% 15%, rgba(0,0,0,0.045) 0, transparent 3px),
      radial-gradient(circle at 40% 55%, rgba(0,0,0,0.05) 0, transparent 3px),
      radial-gradient(circle at 85% 65%, rgba(0,0,0,0.045) 0, transparent 3px),
      radial-gradient(circle at 25% 85%, rgba(0,0,0,0.05) 0, transparent 3px);
    background-size: 260px 260px;
  }

  header{
    position:sticky; top:0; z-index:50;
    background:rgba(255,253,246,0.7);
    backdrop-filter:blur(6px);
    border-bottom:1px solid rgba(59,46,31,0.12);
  }
  .nav{
    max-width:1400px; margin:0 auto; padding:26px 32px;
    display:flex; align-items:center; justify-content:space-between; gap:24px;
  }
  .logo{
    font-size:2.1rem; color:var(--ink); letter-spacing:0.3px;
    display:flex; align-items:baseline; gap:8px; flex-shrink:0;
  }
  .logo .dot{color:var(--coral);}
  .nav-links{
    display:flex; gap:30px; font-size:1.1rem; font-weight:700;
    letter-spacing:0.2px; flex-shrink:1; overflow-x:auto; scrollbar-width:none;
  }
  .nav-links::-webkit-scrollbar{display:none;}
  .nav-links a{text-decoration:none; color:var(--ink); transition:color .15s; white-space:nowrap;}
  .nav-links a:hover{color:var(--coral);}

  .auth-area{display:flex; align-items:center; gap:10px; flex-shrink:0;}
  .signin-btn{
    display:flex; align-items:center; gap:8px; background:var(--board-dark); color:var(--chalk);
    border:none; border-radius:6px; padding:12px 20px; font-family:inherit; font-weight:700;
    font-size:1rem; cursor:pointer;
  }
  .signin-btn:hover{background:#221709;}
  .user-chip{display:flex; align-items:center; gap:8px;}
  .user-chip img{width:36px; height:36px; border-radius:50%;}
  .user-chip span{font-size:0.85rem; color:rgba(59,46,31,0.85); max-width:110px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
  .signout-btn{
    background:none; border:1.3px solid rgba(59,46,31,0.3); color:rgba(59,46,31,0.75);
    border-radius:5px; padding:7px 12px; font-family:inherit; font-size:0.78rem; cursor:pointer;
  }
  .signout-btn:hover{border-color:var(--coral); color:var(--coral);}
  .signin-inline-note{color:var(--ink-soft); font-size:0.9rem; margin:6px 0 16px;}
  .nav-links a:focus-visible, button:focus-visible, .worksheet-card:focus-visible{
    outline:2px solid var(--coral); outline-offset:2px;
  }

  /* HERO */
  .hero{
    max-width:1120px; margin:0 auto; padding:88px 24px 70px;
    display:grid; grid-template-columns:1.1fr 0.9fr; gap:48px; align-items:center;
  }
  .hero h1{
    font-size:clamp(2.6rem, 5vw, 4rem);
    line-height:1.08; margin:0 0 22px; color:var(--ink);
  }
  .hero p{
    font-size:1.15rem; color:var(--ink); max-width:46ch; margin:0 0 30px;
  }
  .cta-row{display:flex; gap:14px; flex-wrap:wrap;}
  .btn{
    font-family:'Quicksand', sans-serif; font-weight:600; font-size:0.95rem;
    padding:13px 24px; border-radius:var(--radius); border:none; cursor:pointer;
    text-decoration:none; display:inline-block;
  }
  .btn-primary{background:var(--coral); color:#fff;}
  .btn-primary:hover{background:#c2432f;}
  .btn-ghost{background:transparent; color:var(--ink); border:1.5px solid rgba(59,46,31,0.35);}
  .btn-ghost:hover{border-color:var(--coral); color:var(--coral);}

  .hero-stack{position:relative; height:300px;}
  .tape-strip{
    position:absolute; width:110px; height:26px; background:#fbe6a8; opacity:0.85;
    box-shadow:0 2px 4px rgba(0,0,0,0.25); top:0; left:0; transform:rotate(-5deg); z-index:3;
  }
  .photo-stack{position:relative; width:100%; height:280px;}
  .photo-stack .p{
    position:absolute; width:150px; background:var(--paper); padding:10px 10px 28px;
    box-shadow:0 8px 16px rgba(0,0,0,0.3);
  }
  .photo-stack .p .sw{height:88px; border-radius:2px;}
  .photo-stack .p span{font-family:'Shadows Into Light', cursive; font-size:1.05rem; display:block; margin-top:8px; color:var(--ink);}
  .photo-stack .p1{top:6px; left:30px; transform:rotate(-7deg); z-index:1;}
  .photo-stack .p1 .sw{background:#f2d3c4;}
  .photo-stack .p2{top:70px; left:170px; transform:rotate(6deg); z-index:2;}
  .photo-stack .p2 .sw{background:#d6d9f0;}
  .photo-stack .p3{top:150px; left:60px; transform:rotate(3deg); z-index:3;}
  .photo-stack .p3 .sw{background:#cbe4d4;}

  /* SUBJECTS */
  section{max-width:1120px; margin:0 auto; padding:70px 24px;}
  .section-head{margin-bottom:36px;}
  .section-head h2{font-size:2.1rem; color:var(--ink); margin:0 0 8px;}
  .section-head p{color:var(--ink); margin:0; max-width:60ch;}

  .subject-grid{
    display:grid; grid-template-columns:repeat(3, 1fr); gap:26px 22px; padding-top:8px;
  }
  .subject-card{
    background:var(--paper); color:var(--ink); border-radius:2px;
    padding:22px 20px 20px; cursor:pointer; border:none; text-align:left;
    font-family:inherit; box-shadow:0 8px 16px rgba(0,0,0,0.28);
    transition:transform .15s ease; position:relative;
    transform:rotate(var(--tilt, -1.5deg));
  }
  .subject-card:nth-child(6n+1){--tilt:-2deg;}
  .subject-card:nth-child(6n+2){--tilt:1.5deg;}
  .subject-card:nth-child(6n+3){--tilt:-1deg;}
  .subject-card:nth-child(6n+4){--tilt:2deg;}
  .subject-card:nth-child(6n+5){--tilt:-1.5deg;}
  .subject-card:nth-child(6n+6){--tilt:1deg;}
  .subject-card:hover{transform:rotate(0deg) translateY(-4px); z-index:2;}
  .subject-card::before{
    content:''; position:absolute; top:-9px; left:50%; margin-left:-8px;
    width:16px; height:16px; border-radius:50%; background:#d9503f;
    box-shadow:0 2px 3px rgba(0,0,0,0.4), inset -2px -2px 3px rgba(0,0,0,0.25), inset 2px 2px 3px rgba(255,255,255,0.4);
  }
  .subject-card h3{font-family:'Shadows Into Light', cursive; font-size:1.35rem; margin:0 0 6px;}
  .subject-card .count{font-size:0.85rem; color:var(--ink-soft);}
  .subject-card .bar{width:34px; height:5px; border-radius:3px; margin-bottom:14px;}

  /* WORKSHEETS */
  .subject-block{margin-bottom:56px;}
  .subject-block h3{font-size:1.6rem; color:var(--ink); margin:0 0 4px; display:flex; align-items:center; gap:10px;}
  .subject-block .bar-small{width:28px; height:5px; border-radius:3px;}
  .worksheet-list{display:grid; grid-template-columns:repeat(2, 1fr); gap:14px; margin-top:18px;}
  .worksheet-card{
    background:var(--paper-dim); border-radius:4px; padding:18px 18px;
    display:flex; justify-content:space-between; align-items:flex-start; gap:12px;
    border:1px solid rgba(0,0,0,0.05);
  }
  .worksheet-card .info h4{margin:0 0 4px; color:var(--ink); font-size:1.05rem; font-weight:600;}
  .worksheet-card .info span{font-size:0.85rem; color:var(--ink-soft);}
  .worksheet-actions{display:flex; flex-direction:column; gap:8px; align-items:flex-end;}
  .link-btn{
    background:none; border:none; font-family:inherit; font-size:0.85rem; font-weight:600;
    cursor:pointer; padding:6px 10px; border-radius:4px; white-space:nowrap;
  }
  .link-btn.download{background:var(--board-dark); color:var(--chalk);}
  .link-btn.download:hover{background:#221709;}
  .link-btn.discuss{color:var(--ink); border:1.3px solid rgba(0,0,0,0.18);}
  .link-btn.discuss:hover{border-color:var(--coral); color:var(--coral);}

  /* HOW IT WORKS */
  .how-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:24px;}
  .how-card{background:rgba(255,253,246,0.55); border:1px solid rgba(59,46,31,0.15); border-radius:6px; padding:24px;}
  .how-card .num{font-family:'Shadows Into Light', cursive; font-size:2rem; color:var(--coral); margin:0 0 10px;}
  .how-card h4{margin:0 0 8px; font-size:1.1rem; color:var(--ink);}
  .how-card p{margin:0; color:var(--ink); font-size:0.95rem;}

  footer{
    border-top:1px solid rgba(59,46,31,0.15); padding:32px 24px; text-align:center;
    color:var(--ink); font-size:0.9rem;
  }

  /* MODAL */
  .modal-overlay{
    display:none; position:fixed; inset:0; background:rgba(20,13,7,0.72);
    z-index:100; align-items:center; justify-content:center; padding:20px;
  }
  .modal-overlay.open{display:flex;}
  .modal{
    background:var(--paper); color:var(--ink); border-radius:8px; max-width:560px; width:100%;
    max-height:85vh; overflow-y:auto; padding:28px;
  }
  .modal-head{display:flex; justify-content:space-between; align-items:flex-start; margin-bottom:6px;}
  .modal-head h3{margin:0; font-family:'Shadows Into Light', cursive; font-size:1.5rem;}
  .modal-head button{background:none; border:none; font-size:1.4rem; cursor:pointer; color:var(--ink-soft); line-height:1;}
  .modal .sub{color:var(--ink-soft); font-size:0.9rem; margin-bottom:20px;}

  .comment-list{display:flex; flex-direction:column; gap:12px; margin-bottom:20px;}
  .comment{background:var(--paper-dim); border-radius:6px; padding:12px 14px;}
  .comment .meta{display:flex; justify-content:space-between; font-size:0.8rem; color:var(--ink-soft); margin-bottom:4px;}
  .comment .meta .name{font-weight:600; color:var(--ink);}
  .comment p{margin:0; font-size:0.95rem; white-space:pre-wrap;}
  .empty-state{color:var(--ink); font-size:0.9rem; padding:14px 0;}

  .comment-form{display:flex; flex-direction:column; gap:10px;}
  .comment-form input, .comment-form textarea{
    font-family:inherit; font-size:0.95rem; padding:11px 12px; border-radius:5px;
    border:1.3px solid rgba(0,0,0,0.15); background:#fff; color:var(--ink); resize:vertical;
  }
  .comment-form textarea{min-height:70px;}
  .comment-form button{align-self:flex-end;}
  .form-status{font-size:0.82rem; color:var(--ink-soft); min-height:16px;}

  @media (max-width:780px){
    .hero{grid-template-columns:1fr; padding-top:56px;}
    .hero-stack{display:none;}
    .subject-grid{grid-template-columns:repeat(2,1fr);}
    .worksheet-list{grid-template-columns:1fr;}
    .how-grid{grid-template-columns:1fr;}
    .nav-links{display:none;}
  }

  /* ADMIN */
  #admin{display:none;}
  #admin.visible{display:block;}
  #profile{display:none;}
  #profile.visible{display:block;}
  #publicProfileView{display:none;}
  #publicProfileView.visible{display:block;}
  #community{display:none;}
  #community.visible{display:block;}
  .community-grid{
    display:grid; grid-template-columns:repeat(auto-fill, minmax(240px, 1fr)); gap:16px;
  }
  .community-card{
    background:var(--paper); color:var(--ink); border-radius:6px; padding:18px;
    cursor:pointer; border:none; text-align:left; font-family:inherit;
    box-shadow:0 4px 0 rgba(0,0,0,0.15); transition:transform .15s ease;
  }
  .community-card:hover{transform:translateY(-3px);}
  .community-card h4{margin:0 0 6px; font-family:'Shadows Into Light', cursive; font-size:1.15rem;}
  .community-card p{margin:0; font-size:0.85rem; color:var(--ink-soft); line-height:1.4;}
  .admin-card{
    background:var(--paper); color:var(--ink); border-radius:8px; padding:28px;
    max-width:480px; margin:0 auto;
  }
  .admin-card h2{color:var(--ink); font-size:1.6rem; margin:0 0 6px;}
  .admin-card p.hint{color:var(--ink-soft); font-size:0.9rem; margin:0 0 20px;}
  .admin-card label{display:block; font-size:0.85rem; font-weight:600; margin:14px 0 6px;}
  .admin-card input[type="text"], .admin-card input[type="password"], .admin-card select, .admin-card input[type="file"]{
    width:100%; font-family:inherit; font-size:0.95rem; padding:11px 12px; border-radius:5px;
    border:1.3px solid rgba(0,0,0,0.15); background:#fff; color:var(--ink);
  }
  .admin-status{font-size:0.85rem; margin-top:12px; min-height:18px;}
  .footer-admin-link{color:rgba(59,46,31,0.85); text-decoration:none; font-size:0.8rem;}
  .footer-admin-link:hover{color:var(--coral);}

  .subject-checks{display:flex; flex-wrap:wrap; gap:8px;}
  .subject-check{
    display:flex; align-items:center; gap:6px; background:var(--paper-dim);
    border-radius:20px; padding:7px 14px; font-size:0.85rem; cursor:pointer;
    border:1.3px solid transparent; user-select:none;
  }
  .subject-check input{margin:0;}
  .subject-check.checked{border-color:var(--ink); background:#fff;}
  .subject-chip-readonly{
    background:var(--paper-dim); border-radius:20px; padding:7px 14px; font-size:0.85rem;
  }

  /* TESTS */
  .test-list{display:flex; flex-direction:column; gap:12px; margin-top:18px;}
  .test-card{
    background:var(--paper-dim); border-radius:6px; padding:16px 18px;
    display:flex; justify-content:space-between; align-items:center; gap:12px;
    text-decoration:none; border:1px solid rgba(0,0,0,0.05);
  }
  .test-card h4{margin:0 0 4px; color:var(--ink); font-size:1.05rem; font-weight:600;}
  .test-card span{font-size:0.85rem; color:var(--ink-soft);}
  .subject-block-tests{margin-bottom:44px;}

  .qbuilder-block{background:var(--paper-dim); border-radius:6px; padding:18px; margin-top:14px;}
  .qbuilder-block h4{margin:0 0 10px; font-size:1rem; color:var(--ink);}
  .qbuilder-block label{margin-top:10px;}
  .qbuilder-block textarea{
    width:100%; font-family:inherit; font-size:0.95rem; padding:10px 12px; border-radius:5px;
    border:1.3px solid rgba(0,0,0,0.15); background:#fff; color:var(--ink); resize:vertical; min-height:50px;
  }
  .qbuilder-option-row{display:flex; align-items:center; gap:8px; margin-top:8px;}
  .qbuilder-option-row input[type="text"]{flex:1;}

  .quiz-question{background:var(--paper-dim); border-radius:6px; padding:20px; margin-bottom:16px; color:var(--ink);}
  .quiz-question h4{margin:0 0 14px; font-size:1.05rem; color:var(--ink);}
  .quiz-option{
    display:flex; align-items:center; gap:10px; padding:10px 12px; border-radius:5px;
    cursor:pointer; margin-bottom:8px; border:1.3px solid rgba(0,0,0,0.12); background:#fff; color:var(--ink);
  }
  .quiz-option:hover{border-color:var(--ink);}
  .quiz-option.selected{border-color:var(--ink); background:var(--yellow); background:rgba(244,196,48,0.25);}
  .quiz-option input{margin:0;}

  .result-score{font-family:'Shadows Into Light', cursive; font-size:2.6rem; text-align:center; margin:0 0 4px; color:var(--ink);}
  .result-sub{text-align:center; color:var(--ink-soft); margin:0 0 24px; font-size:0.95rem;}
  .topic-tag{display:inline-block; padding:6px 12px; border-radius:20px; font-size:0.85rem; margin:4px 6px 0 0;}
  .topic-tag.weak{background:rgba(232,101,79,0.15); color:#b6402c;}
  .topic-tag.strong{background:rgba(126,201,163,0.25); color:#2f6b4c;}

  /* MANAGE / DELETE */
  .manage-row{
    display:flex; justify-content:space-between; align-items:center; gap:12px;
    background:var(--paper-dim); border-radius:5px; padding:12px 14px; margin-bottom:8px;
  }
  .manage-row .info{font-size:0.9rem; color:var(--ink); font-weight:600;}
  .manage-row .info span{display:block; font-size:0.78rem; color:var(--ink-soft); font-weight:400; margin-top:2px;}
  .btn-delete{
    background:none; border:1.3px solid rgba(232,101,79,0.4); color:var(--coral);
    border-radius:5px; padding:6px 12px; font-family:inherit; font-size:0.8rem; cursor:pointer; white-space:nowrap;
  }
  .btn-delete:hover{background:rgba(232,101,79,0.12);}

  /* REPORT / MODERATION */
  .report-link{
    background:none; border:none; color:var(--ink-soft); font-family:inherit;
    font-size:0.75rem; cursor:pointer; padding:0; margin-top:6px; text-decoration:underline;
  }
  .report-link:hover{color:var(--coral);}
  .report-user-btn{
    background:none; border:1.3px solid rgba(0,0,0,0.18); color:var(--ink-soft);
    border-radius:5px; padding:6px 12px; font-family:inherit; font-size:0.78rem; cursor:pointer;
  }
  .report-user-btn:hover{border-color:var(--coral); color:var(--coral);}

  /* POLICY PAGES */
  .policy-content{
    max-width:760px; margin:0 auto 60px; background:var(--paper); color:var(--ink);
    border-radius:8px; padding:40px; line-height:1.65;
  }
  .policy-content h1{font-family:'Shadows Into Light', cursive; font-size:2rem; margin:0 0 6px; color:var(--ink);}
  .policy-content h2{font-family:'Shadows Into Light', cursive; font-size:1.25rem; margin:28px 0 10px; color:var(--ink);}
  .policy-content p{margin:0 0 14px; font-size:0.95rem;}
  .policy-content ul{margin:0 0 14px; padding-left:20px;}
  .policy-content li{margin-bottom:4px; font-size:0.95rem;}
  .policy-content .updated{color:var(--ink-soft); font-size:0.85rem; margin-bottom:24px;}

  /* CONSENT GATE */
  .consent-checkbox-row{display:flex; align-items:flex-start; gap:10px; margin-top:16px;}
  .consent-checkbox-row input{margin-top:3px;}
  .consent-checkbox-row label{font-size:0.9rem; color:var(--ink); font-weight:400; margin:0;}
  .consent-links{font-size:0.9rem; margin-top:6px;}
  .consent-links a{color:var(--ink); text-decoration:underline;}

  /* VIDEOS */
  .video-grid{display:grid; grid-template-columns:repeat(auto-fill, minmax(240px, 1fr)); gap:16px; margin-top:14px;}
  .video-card{
    background:var(--paper); border-radius:6px; overflow:hidden; cursor:pointer;
    text-decoration:none; color:var(--ink); box-shadow:0 4px 0 rgba(0,0,0,0.15);
    transition:transform .15s ease; display:block;
  }
  .video-card:hover{transform:translateY(-3px);}
  .video-thumb{width:100%; aspect-ratio:16/9; object-fit:cover; display:block; background:var(--paper-dim);}
  .video-card .video-info{padding:12px 14px;}
  .video-card h4{margin:0 0 4px; font-family:'Shadows Into Light', cursive; font-size:1.05rem;}
  .video-card span{font-size:0.8rem; color:var(--ink-soft);}
  .video-embed-wrap{position:relative; width:100%; padding-top:56.25%; border-radius:8px; overflow:hidden; margin-bottom:20px;}
  .video-embed-wrap iframe{position:absolute; top:0; left:0; width:100%; height:100%; border:none;}

  /* CHEAT SHEETS */
  .cheatsheet-card{
    background:var(--paper); color:var(--ink); border-radius:3px;
    padding:16px 18px; display:flex; justify-content:space-between; align-items:center; gap:12px;
    box-shadow:0 4px 0 rgba(0,0,0,0.15);
  }
  .cheatsheet-card h4{margin:0 0 2px; font-size:1.02rem; font-weight:600;}
  .cheatsheet-card span{font-size:0.82rem; color:var(--ink-soft);}