:root{
    --ionian-deep:#123C4A;
    --ionian-deeper:#0B2830;
    --shutter-green:#3F5C4E;
    --shutter-green-dark:#2B4038;
    --ochre:#C89B3C;
    --ochre-light:#E4C878;
    --terracotta:#A85433;
    --stone:#EFEADA;
    --stone-card:#F7F4E9;
    --ink:#1B2A2E;
    --ink-soft:#4A5A57;
    --line:#D9D2BC;
    --radius:14px;
    --shadow: 0 2px 10px rgba(11,40,48,0.08);
  }
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    background:var(--stone);
    color:var(--ink);
    font-family:'Public Sans', sans-serif;
    font-size:16px;
    line-height:1.45;
    min-height:100vh;
  }
  h1,h2,h3,.display{
    font-family:'Fraunces', serif;
    font-weight:600;
    letter-spacing:-0.01em;
  }
  .mono{
    font-family:'IBM Plex Mono', monospace;
  }
  /* ---------- App shell ---------- */
  .app{
    display:flex;
    min-height:100vh;
  }
  /* ---------- Sidebar (desktop) ---------- */
  .sidebar{
    width:220px;
    flex-shrink:0;
    background:var(--ionian-deep);
    color:var(--stone-card);
    padding:28px 0 20px;
    position:sticky;
    top:0;
    height:100vh;
    display:flex;
    flex-direction:column;
  }
  .brand{
    padding:0 22px 22px;
    border-bottom:1px solid rgba(255,255,255,0.12);
    margin-bottom:14px;
  }
  .brand-eyebrow{
    font-family:'IBM Plex Mono', monospace;
    font-size:11px;
    letter-spacing:0.14em;
    text-transform:uppercase;
    color:var(--ochre-light);
    margin:0 0 6px;
  }
  .brand h1{
    font-size:23px;
    margin:0;
    color:#fff;
    line-height:1.15;
  }
  .brand .sub{
    font-size:13px;
    color:rgba(255,255,255,0.55);
    margin-top:6px;
  }
  nav.categories{
    display:flex;
    flex-direction:column;
    gap:2px;
    padding:6px 12px;
    flex:1;
  }
  .nav-item{
    display:flex;
    align-items:center;
    gap:12px;
    padding:11px 12px;
    border-radius:10px;
    color:rgba(255,255,255,0.72);
    cursor:pointer;
    font-size:14.5px;
    font-weight:500;
    border:none;
    background:transparent;
    text-align:left;
    width:100%;
    position:relative;
    transition:background 0.15s ease, color 0.15s ease;
  }
  .nav-item:hover{
    background:rgba(255,255,255,0.06);
    color:#fff;
  }
  .nav-item.active{
    background:var(--shutter-green);
    color:#fff;
  }
  .shutter-icon{
    width:20px;
    height:20px;
    flex-shrink:0;
    position:relative;
  }
  .shutter-icon svg{width:100%;height:100%;display:block;}
  .nav-count{
    margin-left:auto;
    font-family:'IBM Plex Mono', monospace;
    font-size:10.5px;
    opacity:0.55;
  }
  .sidebar-foot{
    padding:14px 22px 0;
    font-size:11.5px;
    color:rgba(255,255,255,0.4);
    border-top:1px solid rgba(255,255,255,0.1);
    margin-top:10px;
  }

  /* ---------- Main content ---------- */
  main{
    flex:1;
    min-width:0;
    padding:32px 40px 100px;
  }
  .topbar{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:20px;
    margin-bottom:26px;
    flex-wrap:wrap;
  }
  .topbar h2{
    font-size:26px;
    margin:0;
    color:var(--ionian-deeper);
  }
  .topbar .count-pill{
    font-family:'IBM Plex Mono', monospace;
    font-size:11.5px;
    color:var(--ink-soft);
    background:var(--stone-card);
    border:1px solid var(--line);
    padding:4px 10px;
    border-radius:20px;
  }
  .search-wrap{
    position:relative;
    width:100%;
    max-width:340px;
  }
  .search-wrap input{
    width:100%;
    padding:10px 14px 10px 36px;
    border-radius:10px;
    border:1px solid var(--line);
    background:#fff;
    font-size:14px;
    font-family:'Public Sans',sans-serif;
    color:var(--ink);
  }
  .search-wrap input:focus{
    outline:2px solid var(--shutter-green);
    outline-offset:1px;
  }
  .search-wrap .icon{
    position:absolute;
    left:11px;
    top:50%;
    transform:translateY(-50%);
    opacity:0.4;
    pointer-events:none;
  }
  .wave-divider{
    width:100%;
    height:10px;
    margin:0 0 26px;
    opacity:0.5;
  }

  /* ---------- Section panels ---------- */
  .panel{display:none;}
  .panel.active{display:block;}
  .section-block{margin-bottom:34px;}
  .section-title{
    font-size:12px;
    text-transform:uppercase;
    letter-spacing:0.12em;
    color:var(--terracotta);
    font-weight:600;
    margin:0 0 4px;
    font-family:'IBM Plex Mono', monospace;
  }
  .section-note{
    font-size:13.5px;
    color:var(--ink-soft);
    margin:0 0 16px;
  }

  /* grid of word/phrase cards */
  .grid{
    display:grid;
    grid-template-columns:repeat(auto-fill, minmax(240px,1fr));
    gap:12px;
  }
  .card{
    background:var(--stone-card);
    border:1px solid var(--line);
    border-radius:var(--radius);
    padding:14px 16px;
    box-shadow:var(--shadow);
    display:flex;
    flex-direction:column;
    gap:6px;
  }
  .card .greek{
    font-family:'Fraunces', serif;
    font-weight:600;
    font-size:19px;
    color:var(--ionian-deeper);
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:8px;
  }
  .card .pron{
    font-family:'IBM Plex Mono', monospace;
    font-size:13.5px;
    color:var(--terracotta);
    letter-spacing:0.01em;
  }
  .card .eng{
    font-size:14.5px;
    color:var(--ink-soft);
  }
  .speak-btn{
    width:30px;
    height:30px;
    flex-shrink:0;
    border-radius:50%;
    border:1px solid var(--line);
    background:#fff;
    display:flex;
    align-items:center;
    justify-content:center;
    cursor:pointer;
    color:var(--shutter-green-dark);
    transition:background 0.15s ease, transform 0.1s ease;
  }
  .speak-btn:hover{background:var(--ochre-light);}
  .speak-btn:active{transform:scale(0.92);}
  .speak-btn.playing{background:var(--shutter-green); color:#fff;}
  .speak-btn svg{width:14px;height:14px;}

  /* phrase list style (full sentences, wider cards) */
  .phrase-card{
    background:var(--stone-card);
    border:1px solid var(--line);
    border-left:4px solid var(--shutter-green);
    border-radius:10px;
    padding:14px 16px;
    margin-bottom:10px;
    box-shadow:var(--shadow);
  }
  .phrase-card .greek{
    font-family:'Fraunces', serif;
    font-weight:600;
    font-size:19px;
    color:var(--ionian-deeper);
    display:flex;
    align-items:center;
    gap:10px;
    flex-wrap:wrap;
  }
  .phrase-card .pron{
    font-family:'IBM Plex Mono', monospace;
    font-size:14px;
    color:var(--terracotta);
    margin-top:4px;
  }
  .phrase-card .eng{
    font-size:14.5px;
    color:var(--ink-soft);
    margin-top:4px;
  }

  /* alphabet */
  .alpha-grid{
    display:grid;
    grid-template-columns:repeat(auto-fill, minmax(210px,1fr));
    gap:10px;
  }
  .alpha-card{
    background:var(--stone-card);
    border:1px solid var(--line);
    border-radius:12px;
    padding:12px 14px;
    display:flex;
    align-items:center;
    gap:12px;
    box-shadow:var(--shadow);
  }
  .alpha-letters{
    font-family:'Fraunces', serif;
    font-weight:700;
    font-size:26px;
    color:var(--shutter-green-dark);
    width:52px;
    text-align:center;
    flex-shrink:0;
  }
  .alpha-info .name{
    font-size:13px;
    font-weight:600;
    color:var(--ionian-deeper);
  }
  .alpha-info .sound{
    font-family:'IBM Plex Mono', monospace;
    font-size:12.5px;
    color:var(--terracotta);
    margin-top:2px;
  }
  .alpha-info .example{
    font-size:12px;
    color:var(--ink-soft);
    margin-top:2px;
  }

  /* scenarios */
  .scenario{
    background:var(--stone-card);
    border:1px solid var(--line);
    border-radius:var(--radius);
    box-shadow:var(--shadow);
    margin-bottom:20px;
    overflow:hidden;
  }
  .scenario-head{
    background:var(--ionian-deep);
    color:#fff;
    padding:14px 18px;
    display:flex;
    align-items:center;
    gap:10px;
  }
  .scenario-head .num{
    font-family:'IBM Plex Mono', monospace;
    font-size:12px;
    background:rgba(255,255,255,0.15);
    padding:2px 8px;
    border-radius:20px;
  }
  .scenario-head h3{
    margin:0;
    font-size:17px;
    color:#fff;
  }
  .scenario-body{padding:14px 18px;}
  .line{
    display:flex;
    gap:12px;
    padding:9px 0;
    border-bottom:1px dashed var(--line);
  }
  .line:last-child{border-bottom:none;}
  .line .who{
    flex-shrink:0;
    width:64px;
    font-size:11px;
    text-transform:uppercase;
    letter-spacing:0.06em;
    color:var(--ink-soft);
    font-weight:600;
    padding-top:3px;
  }
  .line .content .greek{
    font-family:'Fraunces', serif;
    font-weight:600;
    font-size:16.5px;
    color:var(--ionian-deeper);
    display:flex;
    align-items:center;
    gap:8px;
  }
  .line .content .pron{
    font-family:'IBM Plex Mono', monospace;
    font-size:13px;
    color:var(--terracotta);
    margin-top:2px;
  }
  .line .content .eng{
    font-size:13.5px;
    color:var(--ink-soft);
    margin-top:2px;
    font-style:italic;
  }

  /* tips */
  .tip-card{
    background:var(--stone-card);
    border:1px solid var(--line);
    border-radius:var(--radius);
    padding:16px 18px;
    margin-bottom:12px;
    box-shadow:var(--shadow);
    display:flex;
    gap:14px;
  }
  .tip-icon{
    flex-shrink:0;
    width:34px;
    height:34px;
    border-radius:50%;
    background:var(--ochre-light);
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:16px;
  }
  .tip-card h4{
    margin:0 0 4px;
    font-size:15px;
    font-family:'Fraunces', serif;
    color:var(--ionian-deeper);
  }
  .tip-card p{
    margin:0;
    font-size:14px;
    color:var(--ink-soft);
  }

  .no-results{
    text-align:center;
    padding:50px 20px;
    color:var(--ink-soft);
    font-size:14.5px;
  }

  /* ---------- Mobile: bottom tab bar ---------- */
  .mobile-tabbar{display:none;}

  @media (max-width: 760px){
    .sidebar{display:none;}
    main{padding:20px 16px 90px;}
    .topbar{flex-direction:column; align-items:flex-start;}
    .topbar h2{font-size:22px;}
    .search-wrap{max-width:none;}
    .mobile-tabbar{
      display:flex;
      position:fixed;
      bottom:0; left:0; right:0;
      background:var(--ionian-deep);
      z-index:50;
      padding:6px 4px 8px;
      justify-content:space-around;
      box-shadow:0 -3px 14px rgba(0,0,0,0.18);
    }
    .mobile-tabbar .tab{
      display:flex;
      flex-direction:column;
      align-items:center;
      gap:3px;
      background:none;
      border:none;
      color:rgba(255,255,255,0.6);
      font-size:10.5px;
      font-family:'Public Sans',sans-serif;
      font-weight:600;
      padding:6px 4px;
      border-radius:10px;
      flex:1;
    }
    .mobile-tabbar .tab.active{
      color:#fff;
      background:var(--shutter-green);
    }
    .mobile-tabbar .tab svg{width:19px;height:19px;}
    .mobile-brand{
      display:flex;
      align-items:baseline;
      gap:8px;
      margin-bottom:18px;
    }
    .mobile-brand h1{
      font-size:20px;
      margin:0;
      color:var(--ionian-deeper);
    }
    .mobile-brand span{
      font-family:'IBM Plex Mono', monospace;
      font-size:10px;
      color:var(--terracotta);
      text-transform:uppercase;
      letter-spacing:0.1em;
    }
  }
  @media (min-width:761px){
    .mobile-brand{display:none;}
  }

  ::selection{background:var(--ochre-light);}
  :focus-visible{outline:2px solid var(--shutter-green); outline-offset:2px;}