:root { --primary: #27ae60; --secondary: #2c3e50; --bg: #f4f7f6; --white: #ffffff; }
    html { -webkit-text-size-adjust: 100%; }
    body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: var(--bg); margin: 0; color: var(--secondary); padding-bottom: 0; }
    body.examen-actiu { padding-bottom: 0; }
    .container { max-width: 850px; margin: 0 auto; padding: 10px; }
    #config-screen { padding-top: 6px; padding-bottom: 0; }
    #config-screen .card {
        margin-bottom: 0;
        padding-top: 18px;
        border-radius: 14px;
        border: 1px solid #e1e9e5;
        box-shadow: 0 4px 18px rgba(44,62,80,0.10);
    }
    
    /* Logo */
    .logo-container { text-align: center; margin: 20px 0; }
    .logo-badge {
        display: inline-block; background: var(--primary); color: white; padding: 12px 25px;
        border-radius: 50px 50px 5px 50px; font-weight: bold; font-size: 24px;
        box-shadow: 0 4px 15px rgba(0,0,0,0.15); border: 3px solid var(--secondary);
    }

    .card { background: var(--white); padding: 20px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); margin-bottom: 20px; }
    
    /* Taula */
    #taula-config-container {
        border-radius: 14px;
        border: 1px solid #e1e9e5;
        background: #fbfdfc;
        padding: 8px;
        box-shadow: inset 0 1px 0 rgba(255,255,255,0.8);
    }
    .taula-config {
        width: 100%;
        border-collapse: separate;
        border-spacing: 0;
        margin-top: 15px;
        background: white;
        border-radius: 12px;
        overflow: hidden;
    }
    #config-screen .taula-config { margin-top: 0; }
    .taula-config th, .taula-config td {
        border: 0;
        border-bottom: 1px solid #e7eeea;
        padding: 10px 6px;
        text-align: center;
    }
    .taula-config th {
        background: var(--primary);
        color: white;
        border-right: 1px solid rgba(205, 242, 219, 0.45);
        font-size: 0.86rem;
        letter-spacing: 0.02em;
    }
    .taula-config th:first-child { text-align: left; padding-left: 12px; }
    .taula-config th:last-child { border-right: 0; }
    .taula-config tr:last-child td { border-bottom: 0; }
    .taula-config td:first-child {
        text-align: left;
        font-weight: 800;
        padding-left: 12px;
        background: #f8fbf9;
        color: var(--secondary);
        font-size: 0.92rem;
    }
    .taula-config tbody tr:nth-child(even) td:not(:first-child) { background: #fcfefd; }
    .taula-config tbody tr:hover td { background: #f2faf5; }
    .no-disponible { color: #c5ced3; background: #f3f5f6 !important; font-weight: 800; }
    .cfg-check {
        width: 28px;
        height: 28px;
        cursor: pointer;
        appearance: none;
        -webkit-appearance: none;
        border: 2px solid #d7e1dc;
        border-radius: 8px;
        background: white;
        display: inline-grid;
        place-content: center;
        margin: 0;
        transition: 0.15s;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }
    .cfg-check::before {
        content: "";
        width: 12px;
        height: 12px;
        border-radius: 4px;
        transform: scale(0);
        transition: 0.12s transform ease-in-out;
        background: white;
    }
    .cfg-check:checked {
        background: var(--primary);
        border-color: var(--primary);
        box-shadow: 0 2px 8px rgba(39,174,96,0.25);
    }
    .cfg-check:checked::before { transform: scale(1); }
    .cfg-check:focus { outline: 3px solid rgba(39,174,96,0.18); outline-offset: 2px; }
    .exam-modes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 8px 0 2px; }
    .exam-mode {
        background: white;
        color: var(--secondary);
        border: 2px solid #ddd;
        border-radius: 10px;
        padding: 14px 10px;
        font-weight: bold;
        cursor: pointer;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
        transition: 0.2s;
        line-height: 1.2;
    }
    @media (hover:hover) { .exam-mode:hover { border-color: var(--primary); background: #f3fbf6; } }
    .exam-mode.selected { border-color: var(--primary); background: #edf9f1; color: var(--primary); }
    .config-top { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; align-items: end; }
    .config-top label b {
        display: block;
        text-align: center;
        color: #7f8c8d;
        font-size: 1rem;
        margin-bottom: 8px;
    }
    .config-qty { padding-bottom: 2px; white-space: nowrap; }
    .config-qty label {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
    }
    .config-qty label b {
        display: inline;
        margin-bottom: 0;
        color: #7f8c8d;
        font-size: 0.92rem;
    }
    .config-qty select {
        border: 2px solid #ddd;
        border-radius: 9px;
        padding: 8px 10px;
        background: white;
        color: var(--secondary);
        font-weight: 800;
    }
    @media (max-width: 700px) {
      .config-top { grid-template-columns: 1fr; gap: 0; }
      .config-qty { padding-bottom: 0; text-align: center; margin-top: 8px; }
    }
    @media (max-width: 560px) { .exam-modes { grid-template-columns: 1fr; } }

    .btn { background: var(--primary); color: white; border: none; padding: 15px; border-radius: 5px; cursor: pointer; font-size: 16px; font-weight: bold; width: 100%; margin-top: 10px; transition: opacity 0.2s; touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
    .btn:disabled { opacity: 0.45; cursor: default; }
    @media (hover:hover) { .btn:hover { opacity: 0.9; } }
    .pregunta-card { border-left: 6px solid var(--secondary); margin-bottom: 20px; padding: 20px; background: white; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.08); }
    .dada-donada { background: var(--secondary); color: white; padding: 8px 12px; border-radius: 5px; display: inline-block; margin-bottom: 15px; font-weight: bold; }
    .input-grup { margin: 15px 0; }
    .input-grup span { display: block; margin-bottom: 5px; font-size: 0.9em; font-weight: bold; }
    input[type="text"] { padding: 12px; width: 100%; border: 2px solid #ddd; border-radius: 5px; box-sizing: border-box; font-size: 16px; }
    .inline-alert-inorganica {
        margin: 6px 0 8px;
        padding: 9px 11px;
        border-radius: 9px;
        background: #fff7df;
        border: 1px solid #f2d48a;
        color: #6c4f00;
        font-weight: 800;
        font-size: 0.92rem;
        line-height: 1.3;
    }
    
    .feedback { margin-top: 5px; font-weight: bold; font-size: 0.9em; }
    .app-alert {
        position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(0.96);
        z-index: 10000; width: calc(100vw - 38px); max-width: 420px;
        background: rgba(255,255,255,0.98); color: var(--secondary); border: 1px solid #e4e9ec;
        border-radius: 18px;
        padding: 18px 18px 18px 48px; box-shadow: 0 18px 46px rgba(44,62,80,0.22);
        font-size: 1rem; line-height: 1.35; font-weight: 800;
        opacity: 0; pointer-events: none; transition: opacity 0.18s ease, transform 0.18s ease;
        text-align: left;
    }
    .app-alert.visible { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    .app-alert.persistent {
        pointer-events: auto;
        padding-right: 48px;
    }
    @media (max-width: 560px) {
        .app-alert {
            width: calc(100vw - 64px);
            max-width: 340px;
            max-height: calc(100vh - 72px);
            overflow-y: auto;
            padding: 16px 14px 16px 42px;
            font-size: 0.94rem;
            line-height: 1.3;
        }
        .app-alert.persistent { padding-right: 42px; }
    }
    .app-alert::before {
        content: "!"; position: absolute; left: 17px; top: 50%; transform: translateY(-50%);
        width: 22px; height: 22px; border-radius: 50%; background: var(--primary); color: white;
        display: grid; place-items: center; font-weight: 900; font-size: 0.9rem;
    }
    @media (max-width: 560px) {
        .app-alert::before { left: 13px; }
    }
    .app-alert strong { display: none; }
    .app-alert-body {
        display: block;
        font-weight: 700;
    }
    .app-alert-close {
        position: absolute;
        top: 10px;
        right: 10px;
        width: 30px;
        height: 30px;
        border: 0;
        border-radius: 999px;
        background: #eef2f4;
        color: var(--secondary);
        font-size: 1.25rem;
        font-weight: 900;
        cursor: pointer;
        line-height: 30px;
    }
    .consulta-float {
        border: 0; border-radius: 999px; background: var(--secondary); color: white;
        padding: 9px 13px; font-weight: 900; box-shadow: 0 3px 10px rgba(0,0,0,0.14);
        cursor: pointer; font-size: 0.9rem;
    }
    .consulta-modal {
        position: fixed; inset: 0; z-index: 11000; background: rgba(44,62,80,0.42);
        display: none; align-items: center; justify-content: center; padding: 16px;
    }
    .consulta-modal.visible { display: flex; }
    .consulta-card {
        position: relative;
        background: white; width: 100%; max-width: 1180px; max-height: 90vh; overflow: auto;
        border-radius: 16px; padding: 18px; box-shadow: 0 12px 35px rgba(0,0,0,0.25);
    }
    .consulta-head { display:flex; justify-content:center; align-items:center; gap:10px; margin-bottom:12px; padding-right:34px; }
    .consulta-head h3 { margin:0; color:var(--secondary); }
    .consulta-close {
        position:absolute; top:10px; right:10px; z-index:2;
        width:28px; height:28px; border:0; background:#eef2f4; color:var(--secondary);
        border-radius:999px; padding:0; font-weight:900; cursor:pointer; font-size:1.15rem;
        line-height:28px; text-align:center;
    }
    .consulta-panel { display:none; }
    .consulta-panel.visible { display:block; }
    .periodic-legend {
        display:flex; justify-content:center; flex-wrap:wrap; gap:10px 16px;
        margin:0 0 10px; color:#52616a; font-size:0.82rem; font-weight:800;
    }
    .periodic-legend span { display:inline-flex; align-items:center; gap:6px; }
    .legend-swatch {
        width:14px; height:14px; border-radius:4px; border:1px solid #dfe7e2;
        display:inline-block;
    }
    .legend-swatch.no-metall { background:#ffe4bd; border-color:#d77b16; }
    .legend-swatch.metall { background:#d7ecff; border-color:#2f80c0; }
    .legend-swatch.transicio { background:#eadcff; border-color:#7d5ac7; }
    .periodic-wrap { width:100%; overflow-x:auto; padding-bottom:8px; -webkit-overflow-scrolling:touch; }
    .periodic-grid {
        display:grid; grid-template-columns:repeat(18, 54px); grid-auto-rows:64px;
        gap:4px; width:max-content; min-width:1040px; margin:0 auto;
    }
    .element-cell {
        border:1px solid #dfe7e2; border-radius:7px; padding:4px 3px; background:#fbfdfc;
        text-align:center; display:flex; flex-direction:column; justify-content:center; gap:2px;
        box-shadow:0 1px 3px rgba(0,0,0,0.04);
    }
    .element-cell b { color:var(--secondary); font-size:0.98rem; line-height:1; }
    .element-cell span { color:#52616a; font-size:0.58rem; line-height:1.05; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
    .element-cell small { color:#1f7f45; font-size:0.54rem; line-height:1.05; font-weight:800; }
    .element-cell.metall { background:#d7ecff; border-color:#2f80c0; }
    .element-cell.transicio { background:#eadcff; border-color:#7d5ac7; }
    .element-cell.no-metall { background:#ffe4bd; border-color:#d77b16; }
    .element-cell.halogen,
    .element-cell.gas,
    .element-cell.semimetall { background:#ffe4bd; border-color:#d77b16; }
    .terminacions-valencies {
        grid-column:3 / 13; grid-row:1 / 4;
        align-self:center; justify-self:center;
        display:grid; grid-template-columns:78px repeat(5, 39px); gap:2px;
        background:#f8fafb; border:1px solid #e4e9ec; border-radius:10px;
        padding:6px; color:#52616a; font-size:0.62rem; line-height:1;
        box-shadow:0 1px 4px rgba(0,0,0,0.05);
    }
    .terminacions-valencies b {
        color:var(--secondary); text-align:left; font-size:0.61rem; align-self:center;
        white-space:nowrap;
    }
    .terminacions-valencies div,
    .terminacions-valencies span {
        min-height:15px; display:flex; align-items:center; justify-content:center;
        border-radius:4px; background:white; font-weight:800;
    }
    .terminacions-valencies div { background:transparent; color:#7f8c8d; font-size:0.56rem; }
    .nota-consultes {
        background:#f8fafb; border:1px solid #e4e9ec; border-radius:12px;
        padding:10px; margin:12px 0 18px; color:#52616a; font-weight:700;
    }
    @media (min-width: 1200px) {
      .consulta-card { max-width: 1240px; }
      .periodic-grid { grid-template-columns:repeat(18, 58px); grid-auto-rows:66px; min-width:1111px; }
      .terminacions-valencies { grid-template-columns:86px repeat(5, 43px); font-size:0.66rem; }
    }
    .pregunta-card { position: relative; }
    .pregunta-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 10px;
        margin-bottom: 8px;
        padding-right: 0;
    }
    .pregunta-count {
        font-size: 0.82rem;
        color: #7f8c8d;
        font-weight: 900;
        letter-spacing: 0.03em;
    }
    .pregunta-header-actions {
        display: flex;
        align-items: center;
        justify-content: flex-end;
        gap: 8px;
        flex: 0 0 auto;
    }
    .consulta-inorganica-slot { display: flex; align-items: center; }
    .pregunta-actions { display: grid; grid-template-columns: 1.4fr 1fr; gap: 10px; margin-top: 16px; align-items: stretch; }
    .pregunta-actions .btn { margin-top: 0; }
    .btn-help-answer {
        padding: 0;
        min-height: 40px;
        background: #eef5f2;
        color: var(--secondary);
        border: 2px solid #d7e5dd;
        border-radius: 12px;
        font-size: 1.15rem;
        font-weight: 900;
    }
    .pregunta-help-btn {
        width: 40px;
        height: 40px;
        min-height: 40px;
        cursor: pointer;
    }
    @media (max-width: 560px) {
      .pregunta-actions { grid-template-columns: 1fr; }
      .pregunta-header { align-items: flex-start; }
      .consulta-float { padding: 8px 11px; font-size: 0.82rem; }
    }
    .config-actions { position: sticky; bottom: 0; z-index: 50; background: rgba(255,255,255,0.96); border-top: 1px solid #ddd; margin: 8px -20px -20px; padding: 8px 20px 12px; padding: 8px 20px max(12px, env(safe-area-inset-bottom)); display: grid; grid-template-columns: 1fr 1.4fr; gap: 8px; box-shadow: 0 -4px 12px rgba(0,0,0,0.08); }
    .config-actions .btn { margin-top: 0; }
    @media (max-width: 560px) { .config-actions { grid-template-columns: 1fr; } }
    .hidden { display: none !important; }
    sub { font-size: 0.7em; }