:root{
    --bg: #0b1220;
    --panel: #121b2e;
    --panel-2: #17233a;
    --line: rgba(237,239,245,0.10);
    --text: #edeff5;
    --text-dim: #9aa5bd;

    --era: #3fbfad;
    --era-dim: rgba(63,191,173,0.15);
    --era-glow: rgba(63,191,173,0.35);

    --ok: #5fd07a;
    --bad: #ef6a6a;
    --exam: #e0a63f;
  }

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

  body{
    background: var(--bg);
    color:var(--text);
    font-family:'Inter', sans-serif;
    min-height:100vh;
    padding: 20px 16px 60px;
  }

  .wrap{ max-width: 900px; margin: 0 auto; }

  /* ---------- HEADER ---------- */
  header{ margin-bottom: 20px; }
  .eyebrow{
    font-family:'JetBrains Mono', monospace;
    font-size: 10.5px;
    letter-spacing: 2px;
    color: var(--text-dim);
    text-transform: uppercase;
  }
  h1{
    font-family:'Space Grotesk', sans-serif;
    font-size: clamp(24px, 5vw, 32px);
    font-weight: 700;
    margin: 4px 0 6px;
    letter-spacing: -0.5px;
  }
  header p{ color: var(--text-dim); font-size: 13.5px; max-width: 560px; }

  /* ---------- EXAM CTA ---------- */
  .exam-cta{
    display:flex; align-items:center; justify-content:space-between; gap:14px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px 18px;
    margin: 16px 0;
    cursor: pointer;
    transition: border-color 0.2s ease;
  }
  .exam-cta:hover{ border-color: var(--era); }
  .exam-cta .left .tag{ font-family:'JetBrains Mono', monospace; font-size:10px; color: var(--era); letter-spacing:1px; text-transform:uppercase; transition: color 0.8s ease;}
  .exam-cta .left h3{ font-family:'Space Grotesk', sans-serif; font-size:16.5px; margin-top:4px;}
  .exam-cta .left p{ font-size:12.5px; color:var(--text-dim); margin-top:2px;}
  .exam-cta .arrow{ font-family:'Space Grotesk', sans-serif; font-weight:700; color: var(--era); font-size: 20px; flex-shrink:0; transition: color 0.8s ease;}

  /* ---------- DIAL / ERA SWITCH ---------- */
  .dial-panel{
    margin: 0 0 4px;
  }
  .dial-track{
    display:flex; align-items:center; justify-content:center; gap: 0;
    position:relative;
    padding: 4px;
    background: var(--panel);
    border-radius: 12px;
    border: 1px solid var(--line);
  }
  .era-btn{
    flex:1;
    border:none;
    background: transparent;
    color: var(--text-dim);
    font-family:'Space Grotesk', sans-serif;
    font-weight:600;
    font-size: 13px;
    padding: 10px 8px;
    border-radius: 9px;
    cursor:pointer;
    display:flex; align-items:center; justify-content:center; gap:8px;
    transition: color 0.3s ease;
    position: relative;
    z-index: 2;
  }
  .era-btn.active{ color:#0b1220; }
  .dial-highlight{
    position:absolute;
    top:4px; bottom:4px; left:4px;
    width: calc(20% - 4px);
    background: var(--era);
    border-radius: 7px;
    transition: transform 0.3s ease, background 0.5s ease;
    z-index:1;
  }

  /* ---------- CARD GRID (shared: tense-card + vocab-card) ---------- */
  .tense-grid, .vocab-grid{
    display:grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 12px;
    margin-top: 16px;
  }
  .tense-card, .vocab-card{
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px;
    text-align:left;
    color: var(--text);
    transition: border-color 0.2s ease;
    position:relative;
  }
  .tense-card:hover, .vocab-card:hover{ border-color: var(--era); }
  .tense-card .tag, .vocab-card .tag{
    font-family:'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--era);
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: color 0.8s ease;
  }
  .tense-card h3, .vocab-card h3{
    font-family:'Space Grotesk', sans-serif;
    font-size: 16.5px;
    margin: 5px 0 5px;
  }
  .tense-card p, .vocab-card p{ font-size: 12.5px; color: var(--text-dim); line-height:1.4; margin-bottom: 12px;}
  .tense-card .progress-dot{
    position:absolute; top:16px; right:16px;
    width:8px; height:8px; border-radius:50%;
    background: rgba(237,239,245,0.15);
  }
  .tense-card .progress-dot.done{ background: var(--ok); }

  .card-actions{ display:flex; gap:8px; }
  .card-actions button{
    flex:1; font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:12.5px;
    padding: 9px 8px; border-radius:9px; cursor:pointer; border:1px solid var(--line);
  }
  .btn-secondary{ background: var(--panel-2); color: var(--text); }
  .btn-secondary:hover{ border-color: var(--era); }
  .btn-primary{ background: var(--era); color:#0b1220; border:none !important; transition: background 0.8s ease;}

  /* ---------- TOP TAB SWITCH (Gramática / Vocabulario) ---------- */
  .top-tab-switch{
    display:flex; gap:8px; margin-bottom: 18px;
  }
  .top-tab-btn{
    flex:1; background: var(--panel); border:1px solid var(--line); color: var(--text-dim);
    font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:14px;
    padding: 11px 10px; border-radius: 12px; cursor:pointer;
  }
  .top-tab-btn.active{ background: var(--text); color: var(--bg); border-color: var(--text); }

  /* ---------- VOCAB HOME ---------- */
  .level-switch{
    display:flex; gap:8px; margin-bottom: 18px;
  }
  .level-btn{
    flex:1; background: var(--panel); border:1px solid var(--line); color: var(--text-dim);
    font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:13.5px;
    padding: 11px 10px; border-radius: 12px; cursor:pointer;
  }
  .level-btn.active{ background: var(--era); color:#0b1220; border-color: var(--era); transition: background 0.8s ease, border-color 0.8s ease; }

  /* ---------- VOCAB WORD LIST ---------- */
  .word-group-title{
    font-family:'JetBrains Mono', monospace; font-size:11px; letter-spacing:1.5px; text-transform:uppercase;
    color: var(--era); margin: 20px 0 10px; transition: color 0.8s ease;
  }
  .word-group-title:first-child{ margin-top: 4px; }
  .word-row{
    display:flex; align-items:center; gap:12px;
    background: var(--panel); border:1px solid var(--line); border-radius:12px;
    padding: 12px 14px; margin-bottom: 8px;
  }
  .speak-btn{
    flex-shrink:0; width:38px; height:38px; border-radius:50%;
    background: var(--panel-2); border:1px solid var(--line); color: var(--era);
    font-size:16px; cursor:pointer; transition: border-color 0.8s ease, color 0.8s ease;
  }
  .speak-btn:hover{ border-color: var(--era); }
  .word-row .word-info{ flex:1; min-width:0; }
  .word-row .en-word{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:15px; }
  .word-row .pos-tag{
    font-family:'JetBrains Mono', monospace; font-size:10px; color: var(--text-dim);
    text-transform:uppercase; margin-left:6px;
  }
  .word-row .es-word{ font-size:13px; color: var(--text-dim); margin-top:2px; }

  /* ---------- EXPLANATION VIEW ---------- */
  .guide-header{ margin-bottom: 8px; }
  .guide-header .tag{
    font-family:'JetBrains Mono', monospace; font-size:10.5px; letter-spacing:1.5px;
    text-transform:uppercase; color: var(--era); transition: color 0.8s ease;
  }
  .guide-header h2{ font-family:'Space Grotesk', sans-serif; font-size:24px; margin:6px 0 4px; }
  .guide-header .es-name{ font-size:14px; color: var(--text-dim); }

  .guide-section{
    background: var(--panel); border:1px solid var(--line); border-radius:16px;
    padding: 18px 20px; margin-top: 14px;
  }
  .guide-section h3{
    font-family:'JetBrains Mono', monospace; font-size:11px; letter-spacing:1.5px;
    text-transform:uppercase; color: var(--text-dim); margin-bottom: 12px;
  }
  .structure-row{
    display:grid; grid-template-columns: 90px 1fr; gap: 10px 14px; align-items:start;
    padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 14px;
  }
  .structure-row:last-child{ border-bottom:none; }
  .structure-row .s-label{
    font-family:'JetBrains Mono', monospace; font-size:11px; color: var(--era);
    letter-spacing:1px; text-transform:uppercase; padding-top:3px; transition: color 0.8s ease;
  }
  .structure-row .s-formula{ font-family:'Space Grotesk', sans-serif; font-weight:600; }

  .structure-block{
    padding: 14px 0; border-bottom: 1px solid var(--line);
  }
  .structure-block:last-child{ border-bottom:none; }
  .structure-block .s-label{
    font-family:'JetBrains Mono', monospace; font-size:11px; color: var(--era);
    letter-spacing:1px; text-transform:uppercase; transition: color 0.8s ease;
  }
  .structure-block .s-formula{
    font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:15.5px; margin-top:4px;
  }
  .structure-block .s-note{
    font-size: 13px; color: var(--text-dim); line-height:1.55; margin-top: 8px;
  }
  .structure-block .s-example{
    margin-top: 10px; padding: 10px 12px; background: var(--panel-2); border-radius: 10px;
  }
  .structure-block .s-example .en{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size: 14px; }
  .structure-block .s-example .es{ color: var(--text-dim); font-size: 12.5px; margin-top: 2px; }

  .modals-table{ width:100%; border-collapse: collapse; font-size: 13px; }
  .modals-table th{
    font-family:'JetBrains Mono', monospace; font-size:10.5px; letter-spacing:1px; text-transform:uppercase;
    color: var(--text-dim); text-align:left; padding: 8px; border-bottom:1px solid var(--line);
  }
  .modals-table td{ padding: 10px 8px; border-bottom:1px solid var(--line); vertical-align:top; }
  .modals-table td.modal-name{ font-family:'Space Grotesk', sans-serif; font-weight:700; color: var(--era); transition: color 0.8s ease; white-space:nowrap;}
  .modals-table td .m-en{ font-weight:600; }
  .modals-table td .m-es{ color: var(--text-dim); font-size:12px; margin-top:2px; }

  .example-pair{ margin: 10px 0; padding: 12px 14px; background: var(--panel-2); border-radius: 12px; }
  .example-pair .en{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size: 15px; }
  .example-pair .es{ color: var(--text-dim); font-size: 13px; margin-top: 3px; }

  .signal-chips{ display:flex; flex-wrap:wrap; gap:8px; margin-top: 4px; }
  .signal-chip{
    background: var(--panel-2); border:1px solid var(--line); padding: 5px 12px;
    border-radius: 999px; font-family:'JetBrains Mono', monospace; font-size: 11.5px; color: var(--era);
    transition: color 0.8s ease;
  }

  .guide-cta{
    display:flex; justify-content:flex-end; margin-top: 20px;
  }

  /* ---------- MODULE (practice / exam containers) ---------- */
  .module{ display:none; }
  .module.active{ display:block; }

  .back-btn{
    background:none; border:none; color: var(--text-dim);
    font-family:'JetBrains Mono', monospace; font-size:12.5px;
    cursor:pointer; display:flex; align-items:center; gap:6px;
    margin-bottom: 16px;
  }
  .back-btn:hover{ color: var(--text); }

  .briefing{
    background: var(--panel);
    border: 1px solid var(--line);
    border-left: 3px solid var(--era);
    border-radius: 12px;
    padding: 16px 18px;
    margin-bottom: 18px;
    transition: border-color 0.8s ease;
  }
  .briefing h2{
    font-family:'Space Grotesk', sans-serif;
    font-size: 20px; margin-bottom: 4px;
  }
  .briefing .rule-toggle{
    background:none; border:1px solid var(--line); color: var(--text-dim);
    font-family:'JetBrains Mono', monospace; font-size: 11.5px;
    padding: 6px 12px; border-radius: 999px; cursor:pointer; margin-top:8px;
  }
  .briefing .rule-toggle:hover{ border-color: var(--era); color:var(--text); }
  .rule-body{ display:none; margin-top: 12px; font-size: 13.5px; color: var(--text-dim); line-height:1.6; }
  .rule-body.show{ display:block; }
  .rule-body table{ width:100%; border-collapse: collapse; margin-top:10px; font-size:13px;}
  .rule-body td, .rule-body th{ padding:6px 8px; border-bottom:1px solid var(--line); text-align:left;}
  .rule-body th{ color: var(--text); font-family:'JetBrains Mono', monospace; font-size:11px; text-transform:uppercase; letter-spacing:1px;}

  /* gauges */
  .gauge-row{ display:flex; align-items:center; gap:14px; margin-bottom: 10px; }
  .gauge-track{
    flex:1; height:8px; background: var(--panel-2); border-radius: 999px; overflow:hidden; border:1px solid var(--line);
  }
  .gauge-fill{ height:100%; width:0%; background: var(--era); transition: width 0.4s ease, background 0.8s ease; }
  .gauge-label{ font-family:'JetBrains Mono', monospace; font-size: 12px; color: var(--text-dim); white-space:nowrap; }

  .timer-row{ display:flex; align-items:center; gap:14px; margin-bottom: 18px; }
  .timer-track{ flex:1; height:6px; background: var(--panel-2); border-radius:999px; overflow:hidden; border:1px solid var(--line);}
  .timer-fill{ height:100%; width:100%; background: var(--exam); transition: width 1s linear, background 0.3s ease; }
  .timer-label{ font-family:'JetBrains Mono', monospace; font-size:12px; color: var(--exam); white-space:nowrap; min-width:34px; text-align:right;}

  .console{
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 24px;
  }
  .q-index{
    font-family:'JetBrains Mono', monospace; font-size: 11.5px; color: var(--era);
    letter-spacing:1.5px; text-transform:uppercase; margin-bottom:10px; transition: color 0.8s ease;
  }
  .q-prompt{
    font-family:'Space Grotesk', sans-serif;
    font-size: 21px; font-weight:600; line-height:1.4; margin-bottom: 20px;
  }
  .q-prompt .blank{
    display:inline-block; min-width: 70px; border-bottom: 2px solid var(--era);
    text-align:center; color: var(--era); transition: color 0.8s ease, border-color 0.8s ease;
  }

  .options{ display:grid; gap:10px; }
  .opt-btn{
    background: var(--panel-2);
    border: 1px solid var(--line);
    color: var(--text);
    padding: 13px 16px;
    border-radius: 12px;
    font-size: 15px;
    text-align:left;
    cursor:pointer;
    font-family:'Inter', sans-serif;
    transition: border-color 0.2s ease, background 0.2s ease;
  }
  .opt-btn:hover:not(:disabled){ border-color: var(--era); }
  .opt-btn:focus-visible{ outline:2px solid var(--era); outline-offset:2px; }
  .opt-btn.correct{ border-color: var(--ok); background: rgba(95,208,122,0.12); }
  .opt-btn.incorrect{ border-color: var(--bad); background: rgba(239,106,106,0.12); }
  .opt-btn:disabled{ cursor:default; opacity:0.75; }

  .fill-row{ display:flex; gap:10px; }
  .fill-row input{
    flex:1; background: var(--panel-2); border:1px solid var(--line); color:var(--text);
    padding: 13px 16px; border-radius:12px; font-size:15px; font-family:'Inter', sans-serif;
  }
  .fill-row input:focus{ outline:none; border-color: var(--era); }
  .fill-row button{
    background: var(--era); border:none; color:#0b1220; font-weight:600;
    padding: 0 22px; border-radius:12px; cursor:pointer; font-family:'Space Grotesk', sans-serif;
    transition: background 0.8s ease;
  }
  .fill-row button:disabled{ opacity:0.5; cursor:default; }

  .feedback{
    margin-top: 16px; padding: 14px 16px; border-radius: 12px;
    font-size: 14px; line-height:1.5; display:none;
  }
  .feedback.show{ display:block; }
  .feedback.ok{ background: rgba(95,208,122,0.12); border:1px solid rgba(95,208,122,0.4); color:#c8f5d3; }
  .feedback.bad{ background: rgba(239,106,106,0.12); border:1px solid rgba(239,106,106,0.4); color:#ffd6d6; }
  .feedback .src-tag{ display:block; font-family:'JetBrains Mono', monospace; font-size:10.5px; color:var(--text-dim); margin-top:6px; letter-spacing:0.5px; text-transform:uppercase;}

  .console-footer{ display:flex; justify-content:flex-end; margin-top: 18px; }
  .next-btn{
    background: var(--era); color:#0b1220; border:none; font-weight:700;
    font-family:'Space Grotesk', sans-serif; padding: 12px 24px; border-radius: 12px;
    cursor:pointer; transition: background 0.8s ease, opacity 0.2s ease;
    opacity:0; pointer-events:none;
  }
  .next-btn.show{ opacity:1; pointer-events:auto; }

  /* summary */
  .summary{ text-align:center; padding: 30px 10px; }
  .summary .big-score{
    font-family:'JetBrains Mono', monospace; font-size: 52px; font-weight:700; color: var(--era);
    transition: color 0.8s ease;
  }
  .summary p{ color: var(--text-dim); margin: 8px 0 22px; }
  .summary .actions{ display:flex; gap:12px; justify-content:center; flex-wrap:wrap; }
  .ghost-btn{
    background:none; border:1px solid var(--line); color: var(--text);
    padding: 11px 20px; border-radius: 12px; cursor:pointer; font-family:'Space Grotesk', sans-serif; font-weight:600;
  }
  .ghost-btn:hover{ border-color: var(--era); }
  .solid-btn{
    background: var(--era); border:none; color:#0b1220; padding: 11px 20px; border-radius:12px;
    cursor:pointer; font-family:'Space Grotesk', sans-serif; font-weight:700; transition: background 0.8s ease;
  }

  /* ---------- EXAM SETUP ---------- */
  .setup-panel{
    background: var(--panel); border:1px solid var(--line); border-radius:18px; padding:26px;
  }
  .setup-panel h2{ font-family:'Space Grotesk', sans-serif; font-size:22px; margin-bottom:6px;}
  .setup-panel > p{ color:var(--text-dim); font-size:13.5px; margin-bottom:20px;}
  .field-label{ font-family:'JetBrains Mono', monospace; font-size:11px; letter-spacing:1.5px; text-transform:uppercase; color:var(--text-dim); margin-bottom:8px; display:block;}
  .name-input{
    width:100%; background: var(--panel-2); border:1px solid var(--line); color:var(--text);
    padding: 13px 16px; border-radius:12px; font-size:15px; font-family:'Inter', sans-serif; margin-bottom:22px;
  }
  .name-input:focus{ outline:none; border-color: var(--exam); }
  .diff-options{ display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-bottom:24px;}
  .diff-btn{
    background: var(--panel-2); border:1px solid var(--line); border-radius:14px; padding:16px;
    text-align:left; cursor:pointer; color:var(--text);
  }
  .diff-btn b{ font-family:'Space Grotesk', sans-serif; display:block; font-size:15.5px; margin-bottom:4px;}
  .diff-btn span{ font-size:12.5px; color:var(--text-dim); line-height:1.4; display:block;}
  .diff-btn.selected{ border-color: var(--exam); background: rgba(224,166,63,0.08); }
  .start-exam-btn{
    width:100%; background: var(--exam); border:none; color:#0b1220; font-weight:700;
    font-family:'Space Grotesk', sans-serif; padding: 14px; border-radius:12px; cursor:pointer; font-size:15px;
  }
  .start-exam-btn:disabled{ opacity:0.5; cursor:default; }

  /* ---------- EXAM RESULTS ---------- */
  .breakdown{ text-align:left; margin: 22px 0; }
  .breakdown table{ width:100%; border-collapse:collapse; font-size:13.5px;}
  .breakdown th{ font-family:'JetBrains Mono', monospace; font-size:10.5px; letter-spacing:1px; text-transform:uppercase; color:var(--text-dim); text-align:left; padding:8px; border-bottom:1px solid var(--line);}
  .breakdown td{ padding:8px; border-bottom:1px solid var(--line); }
  .breakdown td.score-cell{ font-family:'JetBrains Mono', monospace; text-align:right; }

  footer{ text-align:center; margin-top: 40px; color: var(--text-dim); font-size:12px; font-family:'JetBrains Mono', monospace;}

  @media (prefers-reduced-motion: reduce){
    *{ transition: none !important; }
  }

  @media (max-width: 520px){
    .dial-track{ flex-direction:column; }
    .dial-highlight{ display:none; }
    .era-btn.active{ background: var(--era); color:#0b1220; border-radius: 12px; }
    .diff-options{ grid-template-columns:1fr; }
    .exam-cta{ flex-direction:column; align-items:flex-start; }
  }