:root {
    --navy: #0B192C;
    --navy-shadow: #050c16;
    --red: #FF4B4B;
    --red-shadow: #EA2B2B;
    --green: #58CC02;
    --green-shadow: #46A302;
    --blue: #1CB0F6;
    --blue-shadow: #1899D6;
    --gold: #FFC800;
    --gold-shadow: #E5B400;
    --gray-bg: #F7F7F7;
    --border: #E5E5E5;
    --border-shadow: #CECECE;
    --text: #3C3C3C;
    --muted: #777777;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Nunito', sans-serif;
}

body {
    background: var(--gray-bg);
    color: var(--text);
    min-height: 100vh;
}

.hidden { display: none !important; }
.w-full { width: 100%; }
.mt-3 { margin-top: 20px; }

/* ALERTA GLOBAL */
.alert-banner {
    background: var(--gold);
    color: var(--navy);
    text-align: center;
    padding: 8px 16px;
    font-weight: 800;
    font-size: 0.9rem;
    border-bottom: 2px solid var(--gold-shadow);
}

/* LAYOUT GENERAL */
.duo-layout {
    display: flex;
    min-height: 100vh;
}

/* SIDEBAR DUOLINGO */
.duo-sidebar {
    width: 250px;
    background: #fff;
    border-right: 2px solid var(--border);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}

.duo-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px 24px;
    cursor: pointer;
}

.logo-badge {
    background: var(--red);
    color: #fff;
    font-weight: 900;
    padding: 8px 10px;
    border-radius: 12px;
    border-bottom: 4px solid var(--red-shadow);
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--navy);
    letter-spacing: 0.5px;
}

.duo-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}

.duo-nav-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-radius: 14px;
    border: 2px solid transparent;
    background: transparent;
    color: var(--muted);
    font-weight: 800;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: 0.15s;
}

.duo-nav-item:hover {
    background: #F1F5F9;
}

.duo-nav-item.active {
    background: #DDF4FF;
    border-color: #84D8FF;
    color: var(--blue);
}

.ceo-btn {
    background: #FFF9DB;
    border-color: var(--gold);
    color: #B45309;
}

.nav-icon { font-size: 1.3rem; }

.pill-count {
    margin-left: auto;
    background: var(--red);
    color: #fff;
    padding: 2px 8px;
    border-radius: 99px;
    font-size: 0.75rem;
}

/* BOTONS 3D ESTIL DUOLINGO */
.btn-3d {
    border: none;
    border-radius: 14px;
    padding: 12px 20px;
    font-weight: 800;
    font-size: 0.95rem;
    letter-spacing: 0.4px;
    cursor: pointer;
    transition: transform 0.08s, filter 0.15s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-3d:active {
    transform: translateY(3px);
}

.btn-navy { background: var(--navy); color: #fff; border-bottom: 4px solid var(--navy-shadow); }
.btn-red { background: var(--red); color: #fff; border-bottom: 4px solid var(--red-shadow); }
.btn-green { background: var(--green); color: #fff; border-bottom: 4px solid var(--green-shadow); }
.btn-blue { background: var(--blue); color: #fff; border-bottom: 4px solid var(--blue-shadow); }
.btn-gold { background: var(--gold); color: var(--navy); border-bottom: 4px solid var(--gold-shadow); }
.btn-gray { background: #E5E5E5; color: var(--text); border-bottom: 4px solid var(--border-shadow); }
.btn-white { background: #fff; color: var(--navy); border: 2px solid var(--border); border-bottom: 4px solid var(--border-shadow); }
.btn-sm { padding: 8px 14px; font-size: 0.8rem; }

/* ZONA PRINCIPAL */
.duo-main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.duo-topbar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 16px;
    padding: 16px 28px;
    background: #fff;
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.top-stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 800;
    padding: 6px 12px;
    border-radius: 12px;
    border: 2px solid var(--border);
    background: #fff;
}

.top-user {
    font-weight: 800;
    font-size: 0.85rem;
    color: var(--navy);
    background: #EDF2F7;
    padding: 6px 12px;
    border-radius: 10px;
}

.content-view {
    padding: 28px;
}

/* MODES RÀPIDS */
.quick-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
    margin-bottom: 28px;
}

.mode-big {
    justify-content: flex-start;
    text-align: left;
    padding: 18px;
}

.big-icon { font-size: 2rem; }
.mode-big strong { display: block; font-size: 1rem; }
.mode-big small { font-weight: 700; opacity: 0.9; font-size: 0.8rem; }

/* BANNERS D'ÀMBIT I NODES */
.unit-banner {
    padding: 18px 22px;
    border-radius: 16px;
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.unit-a { background: var(--navy); border-bottom: 5px solid var(--navy-shadow); }
.unit-b { background: #B91C1C; border-bottom: 5px solid #7F1D1D; }
.unit-c { background: #0284C7; border-bottom: 5px solid #0369A1; }

.unit-tag { font-size: 0.75rem; font-weight: 900; opacity: 0.8; letter-spacing: 1px; }
.unit-banner h2 { font-size: 1.2rem; font-weight: 900; }

.nodes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 14px;
    margin-bottom: 32px;
}

.node-btn {
    background: #fff;
    border: 2px solid var(--border);
    border-bottom: 5px solid var(--border-shadow);
    border-radius: 18px;
    padding: 18px 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-weight: 900;
    color: var(--navy);
    transition: transform 0.1s, border-color 0.15s;
}

.node-btn:hover {
    border-color: var(--blue);
    border-bottom-color: var(--blue-shadow);
    color: var(--blue);
}

.node-btn:active { transform: translateY(3px); }
.node-circle {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: #F1F5F9;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 900;
}

/* PANTALLA DE TEST */
.quiz-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
}

.btn-icon {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--muted);
    cursor: pointer;
    font-weight: 900;
}

.duo-progress-track {
    flex-grow: 1;
    height: 16px;
    background: var(--border);
    border-radius: 99px;
    overflow: hidden;
}

.duo-progress-fill {
    height: 100%;
    background: var(--green);
    width: 0%;
    transition: width 0.25s;
}

.timer-pill, .counter-pill {
    font-weight: 900;
    padding: 6px 12px;
    border-radius: 12px;
    background: #fff;
    border: 2px solid var(--border);
}

.timer-pill { color: var(--red); border-color: var(--red); }

.quiz-body {
    background: #fff;
    border: 2px solid var(--border);
    border-bottom: 5px solid var(--border-shadow);
    border-radius: 20px;
    padding: 28px;
}

.q-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.tag-pill {
    background: #E0F2FE;
    color: #0369A1;
    font-weight: 900;
    font-size: 0.78rem;
    padding: 4px 10px;
    border-radius: 8px;
}

.btn-report {
    background: transparent;
    border: none;
    color: var(--muted);
    font-weight: 800;
    font-size: 0.8rem;
    cursor: pointer;
}

.duo-question {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--navy);
    margin-bottom: 24px;
    line-height: 1.4;
}

.duo-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.duo-opt {
    background: #fff;
    border: 2px solid var(--border);
    border-bottom: 4px solid var(--border-shadow);
    border-radius: 14px;
    padding: 16px 18px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: 0.1s;
}

.duo-opt:hover:not(:disabled) {
    background: #F8FAFC;
    border-color: var(--blue);
    border-bottom-color: var(--blue-shadow);
}

.duo-opt.correct {
    background: #D7FFB8;
    border-color: var(--green);
    border-bottom-color: var(--green-shadow);
    color: #2B6CB0;
}

.duo-opt.wrong {
    background: #FFDFE0;
    border-color: var(--red);
    border-bottom-color: var(--red-shadow);
    color: #9B2C2C;
}

.opt-key {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    flex-shrink: 0;
}

.quiz-bottom-bar {
    margin-top: 20px;
    background: #fff;
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 18px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.feedback-info strong { font-size: 1.1rem; display: block; }
.feedback-info p { font-size: 0.92rem; color: var(--muted); margin-top: 4px; }
.quiz-actions { margin-left: auto; display: flex; gap: 12px; }

/* TARGETES NETES (RÀNQUING I CEO) */
.card-clean {
    background: #fff;
    border: 2px solid var(--border);
    border-bottom: 4px solid var(--border-shadow);
    border-radius: 18px;
    padding: 22px;
}

.card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.ceo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.ceo-badge {
    background: var(--navy);
    color: var(--gold);
    padding: 6px 12px;
    border-radius: 99px;
    font-weight: 800;
    font-size: 0.8rem;
}

.ceo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.duo-input {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-weight: 700;
    margin-top: 8px;
    margin-bottom: 8px;
}

.row-btns { display: flex; gap: 10px; margin-top: 8px; }

.ranking-list, .admin-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.rank-row, .admin-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-weight: 800;
}

/* RESULTATS */
.results-box {
    max-width: 600px;
    margin: 0 auto;
    background: #fff;
    border: 2px solid var(--border);
    border-bottom: 5px solid var(--border-shadow);
    border-radius: 20px;
    padding: 32px;
    text-align: center;
}

.score-badge {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    border: 8px solid var(--green);
    margin: 0 auto 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.score-badge span { font-size: 2.3rem; font-weight: 900; color: var(--navy); }
.res-pills { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 24px; }
.r-pill { padding: 14px; border-radius: 14px; border: 2px solid var(--border); }
.r-pill strong { display: block; font-size: 1.5rem; font-weight: 900; }
.review-list { margin-top: 24px; text-align: left; display: flex; flex-direction: column; gap: 12px; }

/* MÒBIL */
@media (max-width: 820px) {
    .duo-layout { flex-direction: column; }
    .duo-sidebar {
        width: 100%;
        height: auto;
        position: fixed;
        bottom: 0;
        top: auto;
        z-index: 50;
        padding: 8px 12px;
        border-right: none;
        border-top: 2px solid var(--border);
        flex-direction: row;
        align-items: center;
    }
    .duo-logo, .sidebar-footer, .nav-label { display: none; }
    .duo-nav { flex-direction: row; justify-content: space-around; width: 100%; }
    .content-view { padding: 18px 18px 90px; }
}