/* iat.dbgarkua.com — épreuve en ligne (étudiants) et espace du professeur */
/* thème « Cyber Challenge » : fond sombre, néons cyan, bleu et orange de l'IAT */
:root {
  --bg: #050912; --card: #0c1322; --ink: #e6edf7; --mute: #8b9bb4; --line: #1d2a44;
  --brand: #3d6bff; --brand-ink: #ffffff; --brand-soft: #0f1d45; --accent: #ffb020; --accent-soft: #2a1f08;
  --neon: #22e4ff; --mag: #a855f7;
  --ok: #34f5a0; --ok-soft: rgba(52,245,160,.12); --warn: #ffb020; --warn-soft: rgba(255,176,32,.12); --bad: #ff4d6d; --bad-soft: rgba(255,77,109,.12);
  --radius: 14px; --shadow: 0 10px 40px rgba(0,0,0,.45);
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  --display: "Orbitron", "Segoe UI", system-ui, sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; color: var(--ink); background: var(--bg); -webkit-text-size-adjust: 100%; }
button, input, select { font: inherit; color: inherit; }
[hidden] { display: none !important; }
.wrap { max-width: 860px; margin: 0 auto; padding: 16px; }
/* en-tête aux couleurs de l'IAT (bleu et orange du logo) */
.top { background: var(--card); border-bottom: 1px solid var(--line); position: relative; }
.top::after { content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 4px; background: linear-gradient(90deg, var(--brand) 0 62%, var(--accent) 62% 100%); }
.top .wrap { display: flex; align-items: center; gap: 14px; padding-top: 10px; padding-bottom: 10px; }
.brand { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; text-decoration: none; color: inherit; }
.brand img { height: 58px; width: auto; flex: none; background: #fff; border-radius: 8px; }
.logo { width: 46px; height: 46px; border-radius: 10px; background: var(--brand); color: #fff; display: grid; place-items: center; font-weight: 900; letter-spacing: .5px; font-size: 15px; flex: none; box-shadow: inset 0 -6px 0 var(--accent); }
.top h1 { font-size: 17px; margin: 0; line-height: 1.2; color: var(--brand); font-weight: 800; }
.top small { font-size: 12.5px; display: block; color: var(--accent); font-weight: 700; }
.motto { flex: none; background: var(--brand); color: #fff; font-weight: 700; font-size: 13px; padding: 6px 14px; border-radius: 6px; letter-spacing: .2px; }
.card.hero { background: linear-gradient(135deg, var(--brand) 0%, #2a3bd6 70%, #3448e6 100%); color: #fff; border: 0; position: relative; overflow: hidden; }
.hero::after { content: ""; position: absolute; right: -40px; top: -40px; width: 180px; height: 180px; border-radius: 50%; background: var(--accent); opacity: .18; }
.hero h2 { color: #fff; }
.hero .mute { color: rgba(255,255,255,.85); }
.hero .kicker { font-size: 12.5px; font-weight: 800; text-transform: uppercase; letter-spacing: .8px; color: var(--accent); }
.hero .badge { background: rgba(255,255,255,.16); color: #fff; }
.hero .badge.ok::before { background: #4ade80; } .hero .badge.warn::before { background: var(--accent); } .hero .badge.bad::before { background: #f87171; }
.hero .countdown { color: #fff; }
.fact { background: var(--card); }
.fact b { color: var(--brand); }
.guard-list { display: grid; gap: 8px; margin: 10px 0 0; padding: 0; list-style: none; }
.guard-list li { display: flex; gap: 10px; align-items: flex-start; font-size: 14.5px; }
.guard-list li::before { content: ""; flex: none; width: 8px; height: 8px; margin-top: 8px; border-radius: 2px; background: var(--accent); }
/* signature du concepteur */
.sig { margin: 28px 0 0; padding: 18px 0 26px; border-top: 1px solid var(--line); text-align: center; color: var(--mute); font-size: 13px; }
.sig .sign { display: block; font-family: "Great Vibes", "Segoe Script", "Brush Script MT", cursive; font-size: 30px; line-height: 1.2; color: var(--brand); font-weight: 400; margin: 2px 0; }
.sig small { display: block; font-size: 12px; }
body.exam .sig { display: none; }
#wm { position: fixed; inset: 0; z-index: 4; pointer-events: none; background-repeat: repeat; }
.hp { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0 0 0 0) !important; clip-path: inset(50%) !important; white-space: nowrap !important; border: 0 !important; opacity: 0 !important; }
.xbar .logo { width: 34px; height: 34px; font-size: 12px; box-shadow: inset 0 -4px 0 var(--accent); }
.xbar img { height: 36px; width: auto; background: #fff; border-radius: 6px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-top: 16px; }
.card h2 { margin: 0 0 6px; font-size: 21px; line-height: 1.3; }
.mute { color: var(--mute); }
.badge { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; padding: 4px 10px; border-radius: 999px; background: var(--brand-soft); color: var(--brand); }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.badge::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 16px 0; }
.fact { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.fact b { display: block; font-size: 18px; }
.fact span { color: var(--mute); font-size: 13px; }
.rules { margin: 8px 0 0; padding-left: 20px; }
.rules li { margin: 4px 0; }
.countdown { font-variant-numeric: tabular-nums; font-size: 30px; font-weight: 800; color: var(--brand); margin: 6px 0; }
label.f { display: block; font-weight: 600; font-size: 14px; margin: 12px 0 6px; }
input.t, select.t { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); font-size: 16px; }
input.t:focus, select.t:focus { outline: 2px solid var(--brand); outline-offset: 1px; border-color: transparent; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.check { display: flex; gap: 10px; align-items: flex-start; margin: 16px 0; font-size: 14.5px; }
.check input { width: 20px; height: 20px; margin-top: 2px; flex: none; accent-color: var(--brand); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; border-radius: 10px; padding: 12px 18px; font-weight: 650; cursor: pointer; background: var(--brand); color: var(--brand-ink); text-decoration: none; min-height: 46px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.danger { background: var(--bad); color: #fff; }
.btn.sm { padding: 6px 12px; min-height: 34px; font-size: 14px; border-radius: 8px; }
.btn.block { width: 100%; }
.msg { margin-top: 12px; padding: 10px 12px; border-radius: 10px; font-size: 14.5px; }
.msg.bad { background: var(--bad-soft); color: var(--bad); }
.msg.warn { background: var(--warn-soft); color: var(--warn); }
.msg.ok { background: var(--ok-soft); color: var(--ok); }

/* ---- épreuve */
body.exam { user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; }
body.exam .top { display: none; }
.xbar { position: sticky; top: 0; z-index: 5; background: var(--card); border-bottom: 1px solid var(--line); }
.xbar .wrap { display: flex; align-items: center; gap: 12px; padding-top: 10px; padding-bottom: 10px; }
.who { flex: 1; min-width: 0; }
.who b { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 15px; }
.who span { font-size: 12.5px; color: var(--mute); }
.timer { font-variant-numeric: tabular-nums; font-weight: 800; font-size: 22px; padding: 4px 12px; border-radius: 10px; background: var(--brand-soft); color: var(--brand); }
.timer.warn { background: var(--warn-soft); color: var(--warn); }
.timer.bad { background: var(--bad-soft); color: var(--bad); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .55; } }
.prog { height: 4px; background: var(--line); }
.prog i { display: block; height: 100%; background: var(--brand); width: 0; transition: width .3s; }
.qcard { padding: 22px; }
.qnum { font-size: 13px; font-weight: 700; color: var(--brand); text-transform: uppercase; letter-spacing: .4px; }
.qtext { font-size: 19px; font-weight: 650; margin: 6px 0 4px; line-height: 1.4; }
.qhint { font-size: 13.5px; color: var(--mute); margin-bottom: 12px; }
.opts { display: grid; gap: 10px; }
.opt { display: flex; gap: 12px; align-items: flex-start; border: 1.5px solid var(--line); border-radius: 12px; padding: 14px; cursor: pointer; transition: border-color .15s, background .15s; }
.opt input { width: 20px; height: 20px; margin: 1px 0 0; flex: none; accent-color: var(--brand); }
.opt.on { border-color: var(--brand); background: var(--brand-soft); }
.nav { display: flex; gap: 10px; justify-content: space-between; margin-top: 18px; }
.nav .btn { flex: 1; max-width: 220px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(42px, 1fr)); gap: 8px; margin-top: 12px; }
.grid button { height: 42px; border-radius: 9px; border: 1.5px solid var(--line); background: var(--card); font-weight: 650; cursor: pointer; }
.grid button.done { background: var(--brand-soft); border-color: var(--brand); color: var(--brand); }
.grid button.cur { outline: 2px solid var(--ink); outline-offset: 1px; }
.foot { display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.saved { font-size: 13px; color: var(--mute); }
.blurred main { filter: blur(14px); pointer-events: none; }

/* ---- fenêtres */
.veil { position: fixed; inset: 0; background: rgba(8,12,18,.72); z-index: 50; display: grid; place-items: center; padding: 16px; }
.dlg { background: var(--card); border-radius: 16px; max-width: 460px; width: 100%; padding: 22px; box-shadow: 0 20px 60px rgba(0,0,0,.35); }
.dlg h3 { margin: 0 0 8px; font-size: 19px; }
.dlg .acts { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.dlg .acts .btn { flex: 1; }
.dlg.alert h3 { color: var(--bad); }

/* ---- résultat */
.result { text-align: center; padding: 28px 20px; }
.ring { width: 170px; height: 170px; margin: 10px auto 6px; border-radius: 50%; display: grid; place-items: center; background: conic-gradient(var(--c, var(--brand)) var(--p, 0%), var(--line) 0); }
.ring div { width: 136px; height: 136px; border-radius: 50%; background: var(--card); display: grid; place-items: center; align-content: center; }
.ring b { font-size: 40px; line-height: 1; }
.ring span { color: var(--mute); font-size: 14px; }
.notes { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin: 14px 0; }
.notes span { border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: 14px; }
.notes span.best { border-color: var(--brand); color: var(--brand); font-weight: 700; }

/* ---- espace du professeur */
.wide { max-width: 1200px; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-top: 16px; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.tile b { display: block; font-size: 26px; line-height: 1.1; }
.tile span { color: var(--mute); font-size: 13px; }
.tools { display: flex; gap: 8px; flex-wrap: wrap; }
.tbl { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.tbl th, .tbl td { padding: 10px 8px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.tbl th { font-size: 12.5px; text-transform: uppercase; letter-spacing: .4px; color: var(--mute); }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { display: inline-flex; gap: 6px; align-items: center; border: 1px solid var(--line); border-radius: 8px; padding: 3px 8px; font-size: 13px; background: var(--card); cursor: pointer; text-decoration: none; color: inherit; }
.chip.live { border-color: var(--warn); color: var(--warn); }
.chip b { font-variant-numeric: tabular-nums; }
.det { background: var(--bg); border-radius: 10px; padding: 10px 12px; font-size: 13.5px; }
.det ul { margin: 4px 0 8px; padding-left: 18px; }
.set { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 0 14px; }
.scroll { overflow-x: auto; }
details.box > summary { cursor: pointer; font-weight: 650; list-style: none; display: flex; justify-content: space-between; align-items: center; }
details.box > summary::after { content: "▾"; color: var(--mute); }
details.box[open] > summary::after { content: "▴"; }

@media (max-width: 640px) {
  .motto { display: none; }
  .brand img { height: 46px; }
  .top h1 { font-size: 15px; }
  .wrap { padding: 12px 16px; }
  .card { padding: 16px; }
  .qcard { padding: 16px; }
  .qtext { font-size: 17px; }
  .timer { font-size: 19px; }
  .row2 { grid-template-columns: 1fr; gap: 0; }
  .card h2 { font-size: 19px; }
  .tbl thead { display: none; }
  .tbl, .tbl tbody, .tbl tr, .tbl td { display: block; width: 100%; }
  .tbl tr { border-bottom: 1px solid var(--line); padding: 8px 0; }
  .tbl td { border: 0; padding: 3px 0; }
  .tbl td[data-l]::before { content: attr(data-l) " : "; color: var(--mute); font-size: 12.5px; }
}

/* ============================================================== Cyber Challenge */
body { background:
  radial-gradient(1200px 600px at 85% -10%, rgba(61,107,255,.22), transparent 60%),
  radial-gradient(900px 500px at -10% 10%, rgba(34,228,255,.10), transparent 60%),
  linear-gradient(rgba(34,228,255,.035) 1px, transparent 1px) 0 0 / 100% 32px,
  linear-gradient(90deg, rgba(34,228,255,.035) 1px, transparent 1px) 0 0 / 32px 100%,
  var(--bg); background-attachment: fixed; min-height: 100vh; }
.card { background: linear-gradient(180deg, rgba(16,26,46,.92), rgba(12,19,34,.92)); border-color: var(--line); }
.top { background: rgba(5,9,18,.85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.top::after { height: 2px; bottom: -2px; background: linear-gradient(90deg, transparent, var(--neon) 20%, var(--brand) 55%, var(--accent) 80%, transparent); box-shadow: 0 0 14px var(--neon); }
.top h1 { color: #fff; font-family: var(--display); font-size: 15px; letter-spacing: .6px; text-transform: uppercase; }
.top small { color: var(--accent); font-family: var(--mono); font-size: 11.5px; font-weight: 500; letter-spacing: .3px; }
.logo { background: linear-gradient(135deg, var(--brand), #1b2bb8); box-shadow: inset 0 -5px 0 var(--accent), 0 0 18px rgba(61,107,255,.55); font-family: var(--display); }
.motto { background: transparent; border: 1px solid var(--accent); color: var(--accent); font-family: var(--mono); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 1px; box-shadow: 0 0 12px rgba(255,176,32,.25) inset; }
.wrap { max-width: 980px; }
h2, .card h2 { font-family: var(--display); letter-spacing: .4px; }

/* arène */
.card.hero { background:
  linear-gradient(135deg, rgba(61,107,255,.20), rgba(168,85,247,.10) 45%, rgba(34,228,255,.06)),
  linear-gradient(180deg, #0d1630, #080e1d); border: 1px solid rgba(34,228,255,.28); box-shadow: 0 0 0 1px rgba(34,228,255,.06), 0 0 60px rgba(61,107,255,.18); padding: 26px; }
.hero::after { display: none; }
.hero::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: repeating-linear-gradient(0deg, rgba(255,255,255,.025) 0 1px, transparent 1px 3px); }
.hero .kicker { font-family: var(--mono); color: var(--neon); font-weight: 600; letter-spacing: 1.5px; font-size: 12px; text-transform: uppercase; }
.hero .kicker::before { content: "> "; color: var(--accent); }
.hero h2 { font-size: clamp(22px, 3.4vw, 32px); line-height: 1.2; text-shadow: 0 0 22px rgba(61,107,255,.6); }
.hero .lead { color: #c5d2e8; margin: 8px 0 14px; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; position: relative; }
.tag { font-family: var(--mono); font-size: 12px; padding: 4px 10px; border-radius: 6px; border: 1px solid var(--line); color: #c5d2e8; background: rgba(5,9,18,.5); }
.tag b { color: var(--neon); font-weight: 600; }
.badge { font-family: var(--mono); text-transform: uppercase; letter-spacing: 1px; font-size: 12px; border: 1px solid currentColor; background: transparent; }
.hero .badge { background: rgba(5,9,18,.5); }
.badge.ok, .hero .badge.ok { color: var(--ok); } .badge.warn, .hero .badge.warn { color: var(--warn); } .badge.bad, .hero .badge.bad { color: var(--bad); }
.badge::before { box-shadow: 0 0 8px currentColor; animation: blink 1.4s infinite; }
.hero .badge.ok::before, .hero .badge.warn::before, .hero .badge.bad::before { background: currentColor; }
@keyframes blink { 50% { opacity: .25; } }

/* compte à rebours : page de calendrier + tuiles */
.launch { display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: center; margin-top: 18px; position: relative; }
.cal { width: 150px; border-radius: 14px; overflow: hidden; background: #f4f7ff; color: #0b1020; text-align: center; box-shadow: 0 12px 30px rgba(0,0,0,.5), 0 0 0 1px rgba(255,255,255,.08); position: relative; }
.cal::before, .cal::after { content: ""; position: absolute; top: 6px; width: 10px; height: 10px; border-radius: 50%; background: #0b1020; }
.cal::before { left: 34px; } .cal::after { right: 34px; }
.cal .m { background: linear-gradient(90deg, #ff4d6d, var(--accent)); color: #fff; font-family: var(--display); font-weight: 800; letter-spacing: 2px; font-size: 13px; padding: 20px 6px 8px; text-transform: uppercase; }
.cal .d { font-family: var(--display); font-weight: 900; font-size: 58px; line-height: 1; padding: 10px 0 2px; }
.cal .w { font-weight: 700; text-transform: uppercase; font-size: 12px; letter-spacing: 1.5px; color: #3d4a66; }
.cal .h { margin: 8px 10px 12px; padding: 4px 0; border-top: 1px dashed #c7d0e4; font-family: var(--mono); font-weight: 700; font-size: 15px; color: #1b2bb8; }
.cd-label { font-family: var(--mono); color: var(--mute); font-size: 12.5px; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 10px; }
.cd-label b { color: var(--neon); }
.tiles-cd { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; max-width: 540px; }
.tcd { position: relative; border-radius: 12px; padding: 14px 6px 10px; text-align: center; background: linear-gradient(180deg, #111c36 0 50%, #0b1428 50% 100%); border: 1px solid rgba(34,228,255,.25); box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 0 22px rgba(34,228,255,.08); perspective: 400px; }
.tcd::after { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: rgba(0,0,0,.6); }
.tcd b { display: block; font-family: var(--display); font-size: clamp(28px, 6vw, 50px); font-weight: 800; line-height: 1; color: #fff; text-shadow: 0 0 18px rgba(34,228,255,.75); font-variant-numeric: tabular-nums; }
.tcd span { display: block; margin-top: 8px; font-family: var(--mono); font-size: 10.5px; letter-spacing: 2px; color: var(--neon); text-transform: uppercase; }
.tcd.flip b { animation: flip .45s ease; }
@keyframes flip { 0% { transform: rotateX(80deg); opacity: .2; } 100% { transform: none; opacity: 1; } }
.cd-bar { margin-top: 14px; height: 6px; border-radius: 6px; background: #0b1428; border: 1px solid var(--line); overflow: hidden; max-width: 540px; }
.cd-bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--neon), var(--brand), var(--accent)); box-shadow: 0 0 10px var(--neon); transition: width 1s linear; }
.cd-note { margin-top: 10px; font-size: 13.5px; color: #c5d2e8; }
.cd-note b { color: var(--accent); }
.live { margin-top: 18px; display: flex; gap: 14px; align-items: center; padding: 14px 16px; border-radius: 12px; border: 1px solid rgba(52,245,160,.35); background: rgba(52,245,160,.07); position: relative; }
.live .dot { width: 14px; height: 14px; border-radius: 50%; background: var(--ok); animation: ping 1.6s infinite; flex: none; }
@keyframes ping { 0% { box-shadow: 0 0 0 0 rgba(52,245,160,.6); } 70% { box-shadow: 0 0 0 14px rgba(52,245,160,0); } 100% { box-shadow: 0 0 0 0 rgba(52,245,160,0); } }
.live b { font-family: var(--display); color: var(--ok); letter-spacing: .5px; }
.live.closed { border-color: rgba(255,77,109,.35); background: rgba(255,77,109,.07); }
.live.closed .dot { background: var(--bad); animation: none; }
.live.closed b { color: var(--bad); }

/* briefing, statistiques */
.fact { background: rgba(5,9,18,.55); border-color: var(--line); }
.fact b { font-family: var(--display); color: var(--neon); font-size: 22px; }
.fact span { font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 1px; }
details.box > summary { font-family: var(--mono); text-transform: uppercase; letter-spacing: 1.2px; font-size: 13.5px; color: #fff; }
details.box > summary::before { content: "▸ "; color: var(--accent); }
.rules li::marker { color: var(--neon); }
.guard-list li::before { background: var(--neon); box-shadow: 0 0 8px var(--neon); }

/* identification façon terminal */
form.term { border: 1px solid rgba(34,228,255,.35); box-shadow: 0 0 40px rgba(34,228,255,.08); padding: 0; overflow: hidden; }
.term-bar { display: flex; align-items: center; gap: 7px; padding: 10px 14px; background: #070c18; border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 12px; color: var(--mute); }
.term-bar i { width: 11px; height: 11px; border-radius: 50%; background: #ff5f57; } .term-bar i:nth-child(2) { background: #febc2e; } .term-bar i:nth-child(3) { background: #28c840; }
.term-bar span { margin-left: 8px; }
.term-body { padding: 20px; }
.term-body h2::before { content: "$ "; color: var(--ok); font-family: var(--mono); }
label.f { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: 1.5px; color: var(--neon); font-weight: 500; }
input.t, select.t { background: #070c18; border-color: #24365a; color: #fff; font-family: var(--mono); }
input.t:focus, select.t:focus { outline: 2px solid var(--neon); box-shadow: 0 0 0 4px rgba(34,228,255,.12); }
.btn { background: linear-gradient(90deg, var(--brand), #5b3dff); box-shadow: 0 0 22px rgba(61,107,255,.4); font-family: var(--mono); text-transform: uppercase; letter-spacing: 1px; font-size: 14px; color: #fff; }
.btn:not(:disabled):hover { filter: brightness(1.12); }
.btn.go { background: linear-gradient(90deg, #12c2e9, var(--brand) 60%, var(--mag)); }
.btn.ghost { background: transparent; box-shadow: none; border-color: #2a3c62; color: var(--ink); }
.btn.danger { background: var(--bad); box-shadow: 0 0 18px rgba(255,77,109,.35); }
.check { color: #c5d2e8; }

/* épreuve */
.xbar { background: rgba(5,9,18,.92); backdrop-filter: blur(10px); border-bottom-color: var(--line); }
.timer { font-family: var(--display); background: rgba(34,228,255,.08); color: var(--neon); border: 1px solid rgba(34,228,255,.35); text-shadow: 0 0 10px rgba(34,228,255,.7); }
.timer.warn { background: var(--warn-soft); color: var(--warn); border-color: var(--warn); }
.timer.bad { background: var(--bad-soft); color: var(--bad); border-color: var(--bad); }
.prog i { background: linear-gradient(90deg, var(--neon), var(--brand), var(--accent)); box-shadow: 0 0 10px var(--neon); }
.qnum { font-family: var(--mono); color: var(--neon); letter-spacing: 2px; }
.qnum::before { content: "// "; color: var(--accent); }
.opt { background: rgba(5,9,18,.5); border-color: #213252; }
.opt:hover { border-color: rgba(34,228,255,.5); }
.opt.on { border-color: var(--neon); background: rgba(34,228,255,.08); box-shadow: 0 0 18px rgba(34,228,255,.15); }
.opt input { accent-color: var(--neon); }
.grid button { background: rgba(5,9,18,.6); border-color: #213252; color: #c5d2e8; font-family: var(--mono); }
.grid button.done { background: rgba(34,228,255,.12); border-color: var(--neon); color: var(--neon); }
.grid button.cur { outline-color: var(--accent); }
.dlg { background: #0c1322; border: 1px solid var(--line); }
.veil { background: rgba(2,4,10,.82); }
.ring div { background: #0c1322; }
.ring b { font-family: var(--display); }
.notes span.best { border-color: var(--neon); color: var(--neon); }
.sig .sign { color: #fff; text-shadow: 0 0 14px rgba(61,107,255,.8); }
.tile { background: rgba(12,19,34,.85); border-color: var(--line); }
.tile b { font-family: var(--display); color: var(--neon); }
.chip { background: rgba(5,9,18,.6); border-color: #213252; }
.det { background: rgba(5,9,18,.6); }
.msg.warn, .msg.bad, .msg.ok { border: 1px solid currentColor; }

@media (max-width: 640px) {
  .launch { grid-template-columns: 1fr; justify-items: center; text-align: center; gap: 16px; }
  .cal { width: 130px; } .cal .d { font-size: 48px; }
  .tiles-cd { gap: 7px; width: 100%; }
  .tcd { padding: 12px 2px 8px; }
  .tcd span { font-size: 9px; letter-spacing: 1px; }
  .cd-bar { width: 100%; }
  .card.hero { padding: 20px 16px; }
  .top h1 { font-size: 12px; }
  .top small { font-size: 10.5px; }
}

/* ============================================================== logo IAT et signature */
.brand img { height: 60px; padding: 4px 6px; background: #fff; border-radius: 10px; box-shadow: 0 0 0 1px rgba(255,255,255,.15), 0 0 18px rgba(61,107,255,.35); }
.xbar img { height: 40px; padding: 2px 4px; background: #fff; border-radius: 8px; }
.card.hero { padding-right: 170px; }
.hero-logo { position: absolute; top: 24px; right: 24px; width: 122px; height: auto; background: #fff; border-radius: 16px; padding: 10px; box-shadow: 0 0 0 1px rgba(255,255,255,.2), 0 0 34px rgba(61,107,255,.45), 0 0 60px rgba(255,176,32,.15); z-index: 1; }
.sig { padding: 22px 0 30px; }
.sig .dev { font-family: var(--mono); font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--mute); }
.sig .sign { display: inline-block; margin: 8px 0 6px; font-family: var(--display); font-size: clamp(17px, 2.6vw, 24px); font-weight: 800; letter-spacing: 1.5px; line-height: 1.3;
  background: linear-gradient(90deg, var(--neon), #ffffff 45%, var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; text-shadow: none; filter: drop-shadow(0 0 10px rgba(34,228,255,.35)); }
.sig small { font-family: var(--mono); font-size: 11.5px; color: var(--mute); }
@media (max-width: 640px) {
  .card.hero { padding-right: 16px; }
  .hero-logo { position: static; display: block; width: 96px; margin: 0 0 14px; }
  .brand img { height: 48px; }
}