:root{
    --bg:#fafafa;
    --surface:#ffffff;
    --surface-2:#f4f5f7;
    --border:#e6e7eb;
    --ink:#16171c;
    --ink-soft:#6b6e78;
    --ink-faint:#9a9ca5;
    --primary:#5b4cf0;
    --primary-soft:#eeebfd;
    --primary-dark:#4537d6;
    --human:#10a36b;
    --human-soft:#e6f7ef;
    --ai:#ef5b5b;
    --ai-soft:#fde9e9;
    --warn:#e6a23c;
    --warn-soft:#fdf3e2;
    --radius:14px;
    --radius-sm:9px;
    --shadow-sm:0 1px 2px rgba(20,20,30,.04), 0 1px 1px rgba(20,20,30,.03);
    --shadow-md:0 4px 14px rgba(20,20,30,.06), 0 1px 3px rgba(20,20,30,.04);
    --shadow-lg:0 16px 40px rgba(20,20,30,.10), 0 4px 10px rgba(20,20,30,.05);
    --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Inter",sans-serif;
  }
  *{box-sizing:border-box;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:var(--sans);
    -webkit-font-smoothing:antialiased;
  }
  .wrap{max-width:880px;margin:0 auto;padding:32px 20px 70px;}

  /* ===== header ===== */
  header{
    display:flex;justify-content:space-between;align-items:center;
    margin-bottom:28px;
  }
  .brand{display:flex;align-items:center;gap:11px;}
  .brand .mark{
    width:36px;height:36px;border-radius:10px;
    background:linear-gradient(135deg,var(--primary),#8b7ff7);
    display:flex;align-items:center;justify-content:center;
    color:#fff;font-weight:700;font-size:15px;
    box-shadow:0 4px 10px rgba(91,76,240,.28);
  }
  h1{font-size:21px;margin:0;font-weight:700;letter-spacing:-0.01em;}
  .sub-status{
    font-size:12.5px;color:var(--ink-faint);
    display:flex;align-items:center;gap:7px;
  }
  .dot{width:6px;height:6px;border-radius:50%;background:var(--human);flex-shrink:0;}

  /* ===== tabs ===== */
  nav.tabs{
    display:flex;gap:4px;background:var(--surface-2);
    border-radius:12px;padding:4px;margin-bottom:26px;
    overflow-x:auto;-webkit-overflow-scrolling:touch;
    scrollbar-width:none;
  }
  nav.tabs::-webkit-scrollbar{display:none;}
  nav.tabs button{
    flex:0 0 auto;background:transparent;border:none;
    font-family:var(--sans);font-size:13px;font-weight:600;
    padding:11px 14px;border-radius:9px;cursor:pointer;white-space:nowrap;
    color:var(--ink-soft);transition:color .2s ease, background .2s ease;
  }
  nav.tabs button.active{color:var(--primary-dark);background:var(--surface);box-shadow:var(--shadow-sm);}
  nav.tabs button:hover:not(.active){color:var(--ink);}

  section.panel{display:none;}
  section.panel.active{display:block;animation:fadein .25s ease;}
  @keyframes fadein{from{opacity:0;transform:translateY(4px);}to{opacity:1;transform:translateY(0);}}

  .card{
    background:var(--surface);border:1px solid var(--border);
    border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm);
  }

  label.field-label{
    display:flex;justify-content:space-between;align-items:baseline;
    font-size:13px;font-weight:600;color:var(--ink);margin-bottom:10px;
  }
  label.field-label .hint{font-size:11.5px;font-weight:400;color:var(--ink-faint);}

  textarea{
    width:100%;min-height:190px;
    background:var(--surface-2);
    border:1.5px solid transparent;
    border-radius:var(--radius-sm);
    padding:14px 16px;
    font-family:var(--sans);font-size:15px;line-height:1.6;
    color:var(--ink);resize:vertical;
    transition:border-color .15s ease, background .15s ease;
  }
  textarea::placeholder{color:var(--ink-faint);}
  textarea:focus{outline:none;border-color:var(--primary);background:var(--surface);}

  .meta-row{
    display:flex;justify-content:space-between;
    font-size:11.5px;color:var(--ink-faint);margin-top:8px;
  }

  .controls{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap;align-items:center;}

  button.action{
    font-family:var(--sans);font-size:13.5px;font-weight:600;
    background:var(--primary);color:#fff;border:none;
    padding:11px 22px;border-radius:10px;cursor:pointer;
    box-shadow:0 2px 8px rgba(91,76,240,.28);
    transition:background .15s ease, transform .1s ease;
  }
  button.action:hover{background:var(--primary-dark);}
  button.action:active{transform:scale(.98);}
  button.action:disabled{background:#c7c5e0;cursor:default;box-shadow:none;}
  button.action.is-loading{position:relative;color:transparent;}
  button.action.is-loading::after{
    content:"";position:absolute;left:50%;top:50%;width:16px;height:16px;
    margin:-8px 0 0 -8px;border-radius:50%;
    border:2.5px solid rgba(255,255,255,.45);border-top-color:#fff;
    animation:btn-spin .7s linear infinite;
  }
  @keyframes btn-spin{to{transform:rotate(360deg);}}
  @media (prefers-reduced-motion:reduce){
    button.action.is-loading::after{animation:none;border-top-color:rgba(255,255,255,.45);}
  }

  button.ghost{
    font-family:var(--sans);font-size:13px;font-weight:600;
    background:transparent;border:1.5px solid var(--border);color:var(--ink-soft);
    padding:10px 18px;border-radius:10px;cursor:pointer;
    transition:border-color .15s ease, color .15s ease;
  }
  button.ghost:hover{border-color:var(--ink-faint);color:var(--ink);}

  select.intensity{
    font-family:var(--sans);font-size:13px;font-weight:600;
    border:1.5px solid var(--border);background:var(--surface);
    padding:10px 14px;border-radius:10px;color:var(--ink);cursor:pointer;
  }

  details.advanced{margin-top:16px;}
  details.advanced summary{
    font-size:12.5px;font-weight:600;color:var(--ink-faint);cursor:pointer;
    list-style:none;
  }
  details.advanced summary::-webkit-details-marker{display:none;}
  details.advanced summary::before{content:"⚙ ";}
  details.advanced .inner{margin-top:12px;background:var(--surface-2);padding:14px;border-radius:var(--radius-sm);}
  details.advanced input[type=password]{
    width:100%;font-family:var(--sans);font-size:13px;border:1.5px solid var(--border);
    background:var(--surface);padding:10px 12px;border-radius:8px;color:var(--ink);
  }
  details.advanced input[type=password]:focus{outline:none;border-color:var(--primary);}
  .key-note{font-size:11.5px;color:var(--ink-faint);margin-top:8px;line-height:1.5;}

  .section-title{
    font-size:13px;font-weight:700;color:var(--ink);
    margin:28px 0 14px;display:flex;align-items:center;gap:8px;
  }
  .section-title .pill{
    font-size:10.5px;font-weight:700;color:var(--primary-dark);
    background:var(--primary-soft);padding:2px 8px;border-radius:6px;
  }

  .result-block{display:none;}
  .result-block.show{display:block;animation:fadein .3s ease;}

  .progress-block{display:none;}
  .progress-block.show{display:block;animation:fadein .2s ease;}
  .progress-card{padding:18px 20px;}
  .progress-top{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px;}
  .progress-stage{font-size:13px;font-weight:600;color:var(--ink-soft);}
  .progress-pct{font-size:15px;font-weight:800;color:var(--primary-dark);font-variant-numeric:tabular-nums;}
  .progress-track{height:8px;}
  .progress-track .bar-fill{background:linear-gradient(90deg,var(--primary),#8b7ff7);transition:width .15s linear;}

  /* score cards */
  .score-row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:18px;}
  .score-card{
    flex:1;min-width:190px;
    border-radius:var(--radius);padding:18px;
    border:1px solid var(--border);background:var(--surface);
  }
  .score-card.ai{background:var(--ai-soft);border-color:#f7d4d4;}
  .score-card.human{background:var(--human-soft);border-color:#c9ecdc;}
  .score-card .label{font-size:11px;font-weight:700;letter-spacing:.04em;color:var(--ink-soft);text-transform:uppercase;}
  .score-card.ai .label{color:#c23b3b;}
  .score-card.human .label{color:#0c8857;}
  .score-card .value{font-size:38px;line-height:1.15;margin:4px 0 2px;font-weight:800;letter-spacing:-0.02em;}
  .score-card.ai .value{color:#d64545;}
  .score-card.human .value{color:#0c8857;}

  .bar-track{height:8px;background:rgba(0,0,0,.06);border-radius:6px;margin-top:10px;overflow:hidden;}
  .bar-fill{height:100%;border-radius:6px;width:0%;background:var(--primary);transition:width .6s cubic-bezier(.4,0,.2,1);}
  .bar-fill.ai{background:linear-gradient(90deg,#f08a8a,#ef5b5b);}
  .bar-fill.human{background:linear-gradient(90deg,#4ecb96,#10a36b);}
  .bar-fill.warn{background:linear-gradient(90deg,#f3c46e,#e6a23c);}

  .metric-list{display:flex;flex-direction:column;gap:12px;}
  .metric-row{
    display:grid;grid-template-columns:160px 1fr 48px;
    align-items:center;gap:14px;
  }
  .metric-name{font-size:12.5px;font-weight:600;color:var(--ink-soft);}
  .metric-pct{font-size:13px;text-align:right;font-weight:700;color:var(--ink);}

  .feedback-box{margin-top:8px;}
  .feedback-box h3{
    font-size:13px;font-weight:700;color:var(--ink);margin:0 0 12px;
  }
  .feedback-list{display:flex;flex-direction:column;gap:9px;}
  .feedback-item{
    display:flex;gap:10px;align-items:flex-start;
    font-size:14px;line-height:1.55;color:var(--ink);
    background:var(--surface-2);padding:11px 13px;border-radius:10px;
  }
  .feedback-item .ico{flex-shrink:0;margin-top:1px;}

  .verdict-strip{
    font-size:13.5px;font-weight:700;padding:13px 16px;margin-bottom:18px;
    border-radius:var(--radius-sm);display:flex;justify-content:space-between;align-items:center;
    flex-wrap:wrap;gap:6px;
  }
  .verdict-strip.ai{background:var(--ai-soft);color:#c23b3b;}
  .verdict-strip.warn{background:var(--warn-soft);color:#9a6b1e;}
  .verdict-strip.human{background:var(--human-soft);color:#0c8857;}
  .verdict-strip .conf{font-size:11.5px;font-weight:600;opacity:.75;}

  .diff-out{
    margin-top:16px;border-radius:var(--radius-sm);background:var(--surface-2);
    padding:16px;font-size:15px;line-height:1.65;white-space:pre-wrap;
  }
  .diff-out mark{background:#fce9b8;padding:0 2px;border-radius:3px;}

  .ref-line{
    font-size:13px;padding:11px 13px;display:flex;gap:12px;align-items:flex-start;
    background:var(--surface-2);border-radius:10px;margin-bottom:8px;
  }
  .ref-line .status{flex-shrink:0;font-weight:700;font-size:12px;white-space:nowrap;}
  .status-ok{color:#0c8857;}
  .status-warn{color:#9a6b1e;}
  .status-bad{color:#c23b3b;}
  .ref-text{flex:1;color:var(--ink-soft);}

  .footnote{font-size:11.5px;color:var(--ink-faint);margin-top:40px;text-align:center;line-height:1.5;}

  @media (max-width:680px){
    nav.tabs{flex-direction:column;}
    .metric-row{grid-template-columns:120px 1fr 44px;gap:8px;}
    header{flex-direction:column;align-items:flex-start;gap:10px;}
  }

  @media (prefers-reduced-motion:reduce){
    .bar-fill,section.panel,.result-block.show{transition:none;animation:none;}
  }

  /* ===================== AUTENTICACIÓN ===================== */
  .auth-wrap{max-width:420px;margin:0 auto;padding:60px 20px;}
  .auth-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;box-shadow:var(--shadow-md);}
  .auth-brand{display:flex;align-items:center;gap:11px;justify-content:center;margin-bottom:22px;}
  .auth-brand .mark{width:40px;height:40px;border-radius:11px;background:linear-gradient(135deg,var(--primary),#8b7ff7);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:17px;box-shadow:0 4px 10px rgba(91,76,240,.28);}
  .auth-brand h1{font-size:22px;margin:0;font-weight:800;letter-spacing:-0.01em;}
  .auth-title{font-size:16px;font-weight:700;text-align:center;margin:0 0 6px;}
  .auth-sub{font-size:13.5px;color:var(--ink-soft);text-align:center;margin:0 0 24px;line-height:1.5;}
  .auth-field{margin-bottom:16px;}
  .auth-field label{display:block;font-size:12.5px;font-weight:600;color:var(--ink-soft);margin-bottom:7px;}
  .auth-field input{
    width:100%;font-family:var(--sans);font-size:15px;
    background:var(--surface-2);border:1.5px solid transparent;border-radius:10px;
    padding:12px 14px;color:var(--ink);transition:border-color .15s ease,background .15s ease;
  }
  .auth-field input:focus{outline:none;border-color:var(--primary);background:var(--surface);}
  .auth-submit{
    width:100%;font-family:var(--sans);font-size:14.5px;font-weight:700;
    background:var(--primary);color:#fff;border:none;padding:13px;border-radius:10px;
    cursor:pointer;transition:background .15s ease;box-shadow:0 2px 8px rgba(91,76,240,.28);
  }
  .auth-submit:hover{background:var(--primary-dark);}
  .auth-submit:disabled{background:#c7c5e0;cursor:default;box-shadow:none;}
  .auth-note{font-size:12px;color:var(--ink-faint);text-align:center;margin-top:18px;line-height:1.5;}
  .auth-message{
    margin-top:18px;padding:13px 14px;border-radius:10px;font-size:13.5px;line-height:1.5;display:none;
  }
  .auth-message.show{display:block;}
  .auth-message.success{background:var(--human-soft);color:#0c8857;}
  .auth-message.error{background:var(--ai-soft);color:#c23b3b;}
  .auth-perks{margin-top:26px;padding-top:20px;border-top:1px solid var(--border);}
  .auth-perks li{font-size:13px;color:var(--ink-soft);margin-bottom:8px;list-style:none;display:flex;gap:8px;align-items:flex-start;}
  .auth-perks li::before{content:"✓";color:var(--human);font-weight:700;flex-shrink:0;}
  .auth-perks ul{padding:0;margin:0;}

  /* ===================== BARRA DE CUOTA (en app.html) ===================== */
  .quota-bar-wrap{
    display:flex;align-items:center;gap:14px;background:var(--surface);
    border:1px solid var(--border);border-radius:12px;padding:12px 16px;margin-bottom:20px;
    flex-wrap:wrap;
  }
  .quota-info{flex:1;min-width:180px;}
  .quota-label{font-size:11.5px;font-weight:700;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.03em;}
  .quota-value{font-size:14px;font-weight:700;color:var(--ink);margin-top:2px;}
  .quota-value.premium{color:var(--human);}
  .quota-track{height:6px;background:var(--surface-2);border-radius:5px;margin-top:6px;overflow:hidden;width:160px;}
  .quota-fill{height:100%;background:linear-gradient(90deg,var(--primary),#8b7ff7);border-radius:5px;transition:width .4s ease;}
  .quota-fill.low{background:linear-gradient(90deg,#f08a8a,#ef5b5b);}
  .badge-plan{
    font-size:11px;font-weight:700;padding:4px 10px;border-radius:7px;white-space:nowrap;
  }
  .badge-plan.gratis{background:var(--surface-2);color:var(--ink-soft);}
  .badge-plan.premium{background:var(--human-soft);color:#0c8857;}
  .quota-upgrade-link{font-size:12.5px;font-weight:700;color:var(--primary-dark);text-decoration:none;white-space:nowrap;}
  .quota-upgrade-link:hover{text-decoration:underline;}
  .user-menu{display:flex;align-items:center;gap:10px;}
  .user-email{font-size:12px;color:var(--ink-faint);}
  .signout-btn{font-size:12px;font-weight:600;color:var(--ink-soft);background:none;border:none;cursor:pointer;text-decoration:underline;padding:0;}
  .signout-btn:hover{color:var(--ink);}

  /* ===================== BLOQUEO POR CUOTA AGOTADA ===================== */
  .quota-blocked{
    display:none;background:var(--ai-soft);border:1px solid #f7d4d4;border-radius:var(--radius);
    padding:22px 24px;text-align:center;margin-bottom:20px;
  }
  .quota-blocked.show{display:block;}
  .quota-blocked .icon{font-size:28px;margin-bottom:8px;}
  .quota-blocked h3{font-size:16px;font-weight:800;color:#c23b3b;margin:0 0 6px;}
  .quota-blocked p{font-size:13.5px;color:#9a4444;margin:0 0 16px;line-height:1.5;}
  .quota-blocked .upgrade-btn{
    display:inline-block;font-size:13.5px;font-weight:700;color:#fff;background:var(--primary);
    padding:11px 24px;border-radius:10px;text-decoration:none;box-shadow:0 2px 8px rgba(91,76,240,.28);
  }
  .quota-blocked .upgrade-btn:hover{background:var(--primary-dark);}

  /* ===================== DASHBOARD ===================== */
  .dash-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:20px;}
  .dash-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;}
  .dash-card .dash-label{font-size:11.5px;font-weight:700;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.03em;}
  .dash-card .dash-value{font-size:30px;font-weight:800;color:var(--ink);margin:6px 0 2px;letter-spacing:-0.01em;}
  .dash-card .dash-sub{font-size:12.5px;color:var(--ink-faint);}
  .plan-card{
    background:linear-gradient(135deg,var(--primary-soft),#f4f2fe);border:1px solid #ddd8fb;
    border-radius:var(--radius);padding:26px;margin-bottom:20px;
  }
  .plan-card.is-premium{background:var(--human-soft);border-color:#c9ecdc;}
  .plan-card .plan-title{font-size:18px;font-weight:800;color:var(--ink);margin:0 0 6px;}
  .plan-card .plan-desc{font-size:13.5px;color:var(--ink-soft);margin:0 0 18px;line-height:1.5;}
  .plan-price{font-size:26px;font-weight:800;color:var(--primary-dark);}
  .plan-price span{font-size:13px;font-weight:600;color:var(--ink-soft);}
  .plan-perks{margin:16px 0;padding:0;}
  .plan-perks li{font-size:13.5px;color:var(--ink);margin-bottom:8px;list-style:none;display:flex;gap:8px;align-items:flex-start;}
  .plan-perks li::before{content:"✓";color:var(--human);font-weight:700;flex-shrink:0;}
  .dash-section-title{font-size:14px;font-weight:700;color:var(--ink);margin:28px 0 12px;}
  .module-links{display:flex;gap:12px;flex-wrap:wrap;}
  .module-link{
    flex:1;min-width:140px;background:var(--surface);border:1px solid var(--border);
    border-radius:12px;padding:18px;text-decoration:none;color:var(--ink);
    transition:border-color .15s ease,transform .1s ease;
  }
  .module-link:hover{border-color:var(--primary);transform:translateY(-1px);}
  .module-link .mlabel{font-size:13.5px;font-weight:700;}
  .module-link .msub{font-size:11.5px;color:var(--ink-faint);margin-top:3px;}

  @media (max-width:680px){
    .dash-grid{grid-template-columns:1fr;}
    .quota-bar-wrap{flex-direction:column;align-items:flex-start;}
  }