:root {
    --bg: #f2f4ee;
    --card: #ffffff;
    --card2: #f6f7f1;
    --inset: #2b2f26;
    --text: #242a1f;
    --muted: #74796b;
    --accent: #4d7a3a;
    --accent2: #3a6029;
    --warn: #c08c10;
    --ko: #c9402e;
    --ok: #2e8b47;
    --border: #e3e7d9;
    --radius: 16px;
    --shadow: 0 10px 34px rgba(52, 62, 38, .10);
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: system-ui, "Segoe UI", Roboto, -apple-system, sans-serif;
    background:
        radial-gradient(900px 420px at 80% -10%, #e6ecd9 0%, transparent 60%),
        radial-gradient(700px 400px at -10% 10%, #e9ecdf 0%, transparent 55%),
        var(--bg);
    background-attachment: fixed;
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 740px; margin: 0 auto; padding: 24px 14px 64px; }
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    animation: fadeUp .25s ease;
}
.card.narrow { max-width: 440px; margin: 8vh auto 0; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

h1 { margin: 0 0 8px; font-size: 1.65rem; letter-spacing: -.01em; color: var(--accent2); font-weight: 700; }
h2 { margin: 26px 0 10px; font-size: .95rem; color: var(--accent2); text-transform: uppercase; letter-spacing: .08em; font-weight: 700; }
.sub { color: var(--muted); margin: 0 0 18px; line-height: 1.5; }
.center { text-align: center; }
a { color: var(--accent2); }
code { background: var(--card2); border: 1px solid var(--border); border-radius: 6px; padding: 1px 7px; font-size: .9em; }
.ok { color: var(--ok); } .ko { color: var(--ko); }

/* formulaires */
label { display: block; margin: 14px 0 6px; color: var(--muted); font-size: .9rem; font-weight: 600; }
input[type=text], input[type=password], textarea {
    width: 100%;
    padding: 14px 16px;
    font-size: 1.05rem;
    font-family: inherit;
    border-radius: 12px;
    border: 1.5px solid var(--border);
    background: var(--card2);
    color: var(--text);
    outline: none;
    transition: border-color .15s, box-shadow .15s, background .15s;
}
input[type=text]:focus, input[type=password]:focus, textarea:focus {
    border-color: var(--accent);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(77, 122, 58, .14);
}
textarea { resize: vertical; }

/* boutons pilules */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 22px;
    margin-top: 16px;
    border: 1.5px solid var(--border);
    border-radius: 999px;
    background: var(--card2);
    color: var(--text);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: transform .08s, box-shadow .15s, border-color .15s, filter .15s;
}
.btn:hover { border-color: var(--accent); box-shadow: 0 4px 14px rgba(52,62,38,.12); }
.btn:active { transform: scale(.98); }
.btn.primary {
    background: linear-gradient(160deg, #5c8f45, var(--accent));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 6px 18px rgba(77,122,58,.30);
}
.btn.primary:hover { filter: brightness(1.07); }
.btn.warn {
    background: linear-gradient(160deg, #d9a520, var(--warn));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 6px 18px rgba(192,140,16,.28);
}
.btn.full { width: 100%; }
.btn.big { font-size: 1.15rem; padding: 15px 24px; }
.alert {
    background: #fdf0ee;
    border: 1.5px solid var(--ko);
    color: #8c2b20;
    padding: 11px 14px;
    border-radius: 10px;
}

/* menu : barre haut + navigation */
.app-title { margin: 0 0 18px; text-align: center; font-size: 1.75rem; }
.topbar {
    display: flex; justify-content: space-between; align-items: center; gap: 10px;
    padding-bottom: 14px; margin-bottom: 14px;
    border-bottom: 1px solid var(--border);
}
.hello { font-size: 1.05rem; }
.navlinks { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.navlink {
    display: inline-flex; align-items: center; gap: 7px;
    background: var(--card2);
    border: 1.5px solid var(--border);
    border-radius: 999px;
    padding: 8px 15px;
    font-size: .88rem;
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
    transition: border-color .15s, color .15s, background .15s;
}
.navlink:hover { border-color: var(--accent); color: var(--accent2); background: #fff; }
.sec-title { margin: 26px 0 6px; padding-top: 20px; border-top: 1px solid var(--border); }
.sec-title:first-of-type { margin-top: 0; padding-top: 0; border-top: none; }

/* menu deroulant "Plus" */
.menu-dd { position: relative; }
.menu-dd summary { list-style: none; }
.menu-dd summary::-webkit-details-marker { display: none; }
.menu-dd[open] summary { border-color: var(--accent); color: var(--accent2); }
.dd-list {
    position: absolute;
    right: 0; top: calc(100% + 8px);
    background: var(--card);
    border: 1.5px solid var(--border);
    border-radius: 13px;
    box-shadow: var(--shadow);
    padding: 6px;
    min-width: 190px;
    z-index: 60;
    animation: fadeUp .15s ease;
}
.dd-list a {
    display: block;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--text);
    text-decoration: none;
    font-size: .92rem;
    font-weight: 600;
}
.dd-list a:hover { background: var(--card2); color: var(--accent2); }

/* chapitres : chips interrupteurs */
.chapters { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0 18px; }
.chip {
    position: relative;
    display: flex; align-items: center; gap: 10px;
    background: var(--card2);
    border: 1.5px solid var(--border);
    border-radius: 12px;
    padding: 11px 13px;
    margin: 0;
    cursor: pointer;
    color: var(--text);
    font-weight: 500;
    transition: border-color .15s, background .15s, box-shadow .15s;
}
.chip::before {
    content: '';
    width: 20px; height: 20px; flex: none;
    border: 2px solid var(--border);
    border-radius: 7px;
    background: #fff;
    transition: all .15s;
}
.chip:has(input:checked) {
    border-color: var(--accent);
    background: #eef4e6;
    box-shadow: 0 0 0 3px rgba(77,122,58,.10);
}
.chip:has(input:checked)::before {
    background: var(--accent);
    border-color: var(--accent);
    box-shadow: inset 0 0 0 3px #fff;
}
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip.all { margin-bottom: 10px; background: #eef0e2; font-weight: 600; }
.chip-label { flex: 1; font-size: .95rem; }
.chip-count { color: var(--muted); font-size: .78rem; font-weight: 600; }

/* selecteurs segmentes (nb questions / mode) */
.nbq { display: flex; align-items: center; gap: 8px; margin: 6px 0 16px; flex-wrap: wrap; }
.nbq-label { color: var(--muted); font-size: .92rem; font-weight: 600; margin-right: 4px; }
.nbradio {
    display: inline-flex; align-items: center; gap: 6px;
    margin: 0;
    padding: 9px 18px;
    border-radius: 999px;
    border: 1.5px solid var(--border);
    background: var(--card2);
    color: var(--text);
    cursor: pointer;
    font-size: .95rem;
    font-weight: 600;
    transition: all .15s;
}
.nbradio:has(input:checked) {
    border-color: var(--accent);
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 12px rgba(77,122,58,.25);
}
.nbradio input { position: absolute; opacity: 0; pointer-events: none; }

/* question */
.qhead { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 14px; }
.badge {
    background: var(--card2);
    border: 1.5px solid var(--border);
    border-radius: 999px;
    padding: 4px 13px;
    font-size: .78rem;
    font-weight: 700;
    color: var(--muted);
}
.badge.score { color: var(--accent2); background: #eef4e6; border-color: #d3e0c4; }
.progress { margin-left: auto; color: var(--muted); font-weight: 700; font-size: .95rem; }
.pbar { height: 7px; background: var(--card2); border-radius: 4px; overflow: hidden; margin-bottom: 22px; border: 1px solid var(--border); }
.pfill { height: 100%; background: linear-gradient(90deg, #6fa34e, var(--accent)); border-radius: 4px; transition: width .35s ease; }
.prompt { color: var(--muted); margin: 0 0 4px; font-size: .95rem; }
.fr { font-size: 1.55rem; font-weight: 700; margin: 0 0 22px; letter-spacing: -.01em; }
.fr.small { font-size: 1.1rem; }
.answer-form input { font-size: 1.15rem; text-align: center; letter-spacing: .02em; }
.quit { color: var(--ko); font-size: .9rem; font-weight: 600; }

/* QCM */
.qcm-form { display: flex; flex-direction: column; gap: 10px; }
.choice {
    width: 100%;
    padding: 15px 18px;
    font-size: 1.02rem;
    font-weight: 600;
    text-align: left;
    border: 1.5px solid var(--border);
    border-radius: 13px;
    background: var(--card2);
    color: var(--text);
    cursor: pointer;
    transition: all .15s;
}
.choice:hover { border-color: var(--accent); background: #fff; box-shadow: 0 4px 14px rgba(52,62,38,.10); transform: translateY(-1px); }
.choice:active { transform: scale(.99); }

/* verdict / correction */
.verdict { font-size: 1.12rem; font-weight: 600; padding: 13px 16px; border-radius: 12px; border: 1.5px solid; }
.verdict.ok { background: #e9f6ec; border-color: var(--ok); color: #1f6b37; }
.verdict.half { background: #fdf4dc; border-color: var(--warn); color: #7a5a08; }
.verdict.ko { background: #fdf0ee; border-color: var(--ko); color: #8c2b20; }
.verdict.almost { background: #fdf4dc; border-color: var(--warn); color: #7a5a08; }
.yours { color: var(--muted); }
.answer-line {
    background: var(--card2);
    border: 1.5px dashed var(--border);
    border-radius: 10px;
    padding: 12px 15px;
}
/* panneau diff sombre et lisible */
.diffrows {
    background: var(--inset);
    border-radius: 12px;
    padding: 16px 18px;
    margin: 14px 0;
    overflow-x: auto;
}
.drow { display: flex; align-items: baseline; gap: 12px; white-space: nowrap; }
.drow + .drow { margin-top: 7px; }
.dlabel { color: #8b917f; font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; width: 56px; flex: none; text-align: right; }
.diff {
    font-family: "Cascadia Mono", Consolas, "Courier New", monospace;
    font-size: 1.4rem;
    letter-spacing: .08em;
}
.diff .ok { color: #8fd98f; }
.diff .ko { color: #ff8a7a; border-bottom: 2px solid #ff8a7a; font-weight: 700; }

/* stats */
.statgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 16px 0; }
.statgrid.mastery { grid-template-columns: repeat(4, 1fr); }
.stat { background: var(--card2); border: 1.5px solid var(--border); border-radius: 13px; padding: 18px 14px; text-align: center; }
.stat .num { font-size: 1.8rem; font-weight: 800; color: var(--accent2); letter-spacing: -.02em; }
.stat .lbl { color: var(--muted); font-size: .82rem; font-weight: 600; margin-top: 2px; }
.tbl { width: 100%; border-collapse: collapse; font-size: .92rem; }
.tbl th { text-align: left; color: var(--muted); font-weight: 700; font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; padding: 8px; border-bottom: 2px solid var(--border); }
.tbl td { padding: 9px 8px; border-bottom: 1px solid var(--card2); vertical-align: top; }
.tbl tbody tr:hover td { background: var(--card2); }
.tbl td.center { text-align: center; }
.tbl .ok { font-weight: 700; }
.tbl .half { color: var(--warn); font-weight: 700; }
.tbl .ko { font-weight: 700; }
.bar { position: relative; background: var(--card2); border: 1.5px solid var(--border); border-radius: 999px; height: 20px; min-width: 90px; overflow: hidden; }
.bar .fill { position: absolute; left: 0; top: 0; bottom: 0; background: linear-gradient(90deg, #6fa34e, var(--accent)); opacity: .75; }
.bar span { position: relative; display: block; text-align: center; font-size: .78rem; font-weight: 700; line-height: 18px; }

.finalscore { font-size: 3.2rem; font-weight: 800; text-align: center; color: var(--accent2); margin: 12px 0; letter-spacing: -.03em; }
.finalscore span { font-size: 1.4rem; color: var(--muted); font-weight: 600; }
.recap em { color: var(--muted); }

/* messagerie / signalements */
.report {
    background: var(--card2);
    border: 1.5px solid var(--border);
    border-radius: 13px;
    padding: 15px 17px;
    margin-bottom: 12px;
}
.rep-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 6px; }
.rep-date { color: var(--muted); font-size: .8rem; }
.rep-term { color: var(--muted); font-size: .85rem; background: var(--card); border: 1.5px dashed var(--border); border-radius: 8px; padding: 7px 11px; margin-bottom: 8px; }
.rep-msg { margin: 6px 0; }
.rep-reply { background: #e9f6ec; border-left: 3px solid var(--accent); border-radius: 6px; padding: 9px 13px; margin-top: 8px; }
.rep-pending { color: var(--muted); font-size: .85rem; font-style: italic; margin-top: 8px; }
.rep-form { margin-top: 10px; }
.rep-form .btn { margin-top: 8px; margin-right: 8px; }
.badge.notif { background: var(--ko); color: #fff; border-color: var(--ko); padding: 2px 9px; }
.admin-badge { background: var(--accent); color: #fff; border-color: var(--accent); }
.report-link { color: var(--muted); font-size: .85rem; font-weight: 600; }
.st-open { color: var(--ko); border-color: var(--ko); }
.st-answered { color: var(--warn); border-color: var(--warn); }
.st-closed { color: var(--muted); }

/* duels / classement */
.duel {
    background: var(--card2);
    border: 1.5px solid var(--border);
    border-radius: 13px;
    padding: 14px 17px;
    margin-bottom: 12px;
}
.duel-info { margin-bottom: 8px; font-weight: 600; }
.duel-act .btn { margin-top: 4px; padding: 9px 18px; }
.duel-line { padding: 4px 0; font-size: .95rem; }
.duel-line.win { font-weight: 700; color: var(--accent2); }
tr.winner td { color: var(--accent2); font-weight: 700; }
tr.me td { background: #eef4e6; }

/* divers ajouts */
.badge.streak { color: #b34d00; background: #fdeeda; border-color: #f0d4a8; }
.duel-live {
    background: var(--card2);
    border: 1.5px dashed var(--border);
    border-radius: 10px;
    padding: 9px 13px;
    margin-bottom: 16px;
    font-size: .88rem;
    color: var(--muted);
}
.dl-opp { display: inline-block; margin-right: 14px; }
.audio-btn {
    margin-left: 10px;
    padding: 4px 12px;
    font-size: .82rem;
    font-weight: 700;
    border: 1.5px solid var(--accent);
    border-radius: 999px;
    background: #eef4e6;
    color: var(--accent2);
    cursor: pointer;
}
.btn.mini { padding: 8px 14px; margin-top: 0; font-size: .85rem; }
.btn.mini.danger { border-color: var(--ko); color: var(--ko); }
.vsearch { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.vsearch input { flex: 1; min-width: 180px; }
.vrow { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.vrow input[type=text] { padding: 9px 12px; font-size: .92rem; }
.vrow .vch { flex: none; width: 44px; color: var(--muted); font-size: .8rem; font-weight: 700; }
.vrow select { padding: 9px; border: 1.5px solid var(--border); border-radius: 10px; background: var(--card2); font-family: inherit; max-width: 160px; }
.vrow.vadd { background: var(--card2); border: 1.5px dashed var(--border); border-radius: 12px; padding: 10px; margin: 14px 0 18px; }
.statgrid.four { grid-template-columns: repeat(4, 1fr); }
.chart { width: 100%; height: 160px; display: block; }
.chart .grid { stroke: var(--border); stroke-width: 1; }
.chart .cline { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linejoin: round; }
.chart circle { fill: var(--accent); }
.chart .glabel { font-size: 12px; fill: var(--muted); }

/* mode sombre */
[data-theme="dark"] {
    --bg: #14171a;
    --card: #1d2320;
    --card2: #252b26;
    --inset: #0d0f0c;
    --text: #e4e8de;
    --muted: #98a08d;
    --accent: #7fae60;
    --accent2: #a4c986;
    --warn: #d9a520;
    --ko: #e0685a;
    --ok: #63b87f;
    --border: #36402f;
    --shadow: 0 10px 34px rgba(0, 0, 0, .45);
}
[data-theme="dark"] body {
    background:
        radial-gradient(900px 420px at 80% -10%, #1e2618 0%, transparent 60%),
        radial-gradient(700px 400px at -10% 10%, #1a2019 0%, transparent 55%),
        var(--bg);
}
[data-theme="dark"] input[type=text],
[data-theme="dark"] input[type=password],
[data-theme="dark"] textarea { background: #171c18; color: var(--text); }
[data-theme="dark"] input[type=text]:focus,
[data-theme="dark"] input[type=password]:focus,
[data-theme="dark"] textarea:focus { background: #1e251f; }
[data-theme="dark"] .btn { background: var(--card2); }
[data-theme="dark"] .chip:has(input:checked) { background: #2c3a24; }
[data-theme="dark"] .chip.all { background: #2a3226; }
[data-theme="dark"] .chip::before { background: var(--card); }
[data-theme="dark"] .chip:has(input:checked)::before { background: var(--accent); }
[data-theme="dark"] .badge.score { background: #2c3a24; border-color: #445534; }
[data-theme="dark"] .verdict.ok { background: #1d3225; border-color: var(--ok); color: #8fd8a8; }
[data-theme="dark"] .verdict.half, [data-theme="dark"] .verdict.almost { background: #362d15; border-color: var(--warn); color: #ecc96a; }
[data-theme="dark"] .verdict.ko, [data-theme="dark"] .alert { background: #331d1a; border-color: var(--ko); color: #eda295; }
[data-theme="dark"] .rep-reply { background: #1d3225; }
[data-theme="dark"] tr.me td { background: #26301f; }
[data-theme="dark"] .audio-btn { background: #2c3a24; }
[data-theme="dark"] .badge.streak { background: #3a2c14; border-color: #6b4d1e; color: #eab565; }
[data-theme="dark"] .vrow select { background: #171c18; color: var(--text); }
[data-theme="dark"] .dd-list a:hover { background: var(--card2); }
[data-theme="dark"] .choice:hover, [data-theme="dark"] .navlink:hover, [data-theme="dark"] .btn:hover { background: #232a24; }
[data-theme="dark"] code { background: var(--card2); }

/* infobulles au survol (desktop) */
[data-tip] { position: relative; }
@media (hover: hover) {
    [data-tip]:hover::after {
        content: attr(data-tip);
        position: absolute;
        bottom: calc(100% + 9px);
        left: 50%;
        transform: translateX(-50%);
        background: var(--inset);
        color: #fff;
        padding: 8px 13px;
        border-radius: 9px;
        font-size: .8rem;
        font-weight: 500;
        width: max-content;
        max-width: 250px;
        white-space: normal;
        text-align: center;
        z-index: 50;
        box-shadow: 0 6px 18px rgba(0,0,0,.25);
        pointer-events: none;
    }
    [data-tip]:hover::before {
        content: '';
        position: absolute;
        bottom: calc(100% + 3px);
        left: 50%;
        transform: translateX(-50%);
        border: 6px solid transparent;
        border-top-color: var(--inset);
        z-index: 50;
        pointer-events: none;
    }
}

/* mobile */
@media (max-width: 560px) {
    .chapters { grid-template-columns: 1fr; }
    .card { padding: 20px; }
    .statgrid { grid-template-columns: 1fr; }
    .statgrid.mastery { grid-template-columns: repeat(2, 1fr); }
    .navlinks { gap: 6px; }
    .navlink { padding: 10px 15px; font-size: .85rem; }
    .choice { padding: 17px 18px; }
    .btn { padding: 14px 20px; }
    .fr { font-size: 1.35rem; }
    .diff { font-size: 1.15rem; }
    .drow { white-space: normal; }
    .finalscore { font-size: 2.4rem; }
    .tbl { font-size: .85rem; }
}