/* Introduction animée affichée à la première visite */

/* first-visit introduction: Traduire -> Mes mots -> Réviser */
.intro { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center; padding: 16px; background: rgba(21,24,33,.55); }
.intro-box { position: relative; width: 100%; max-width: 460px; max-height: calc(100vh - 32px); overflow: auto; background: var(--surface); border-radius: 18px; box-shadow: 0 20px 60px rgba(0,0,0,.25); padding: 22px 22px 18px; display: flex; flex-direction: column; gap: 14px; }
.intro-eyebrow { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.intro-eyebrow svg { width: 22px; height: 22px; }
.intro-skip { margin-left: auto; }
.intro-flow { display: flex; align-items: center; gap: 4px; font-size: 13px; }
.intro-flow span { flex: 1; text-align: center; padding: 6px 4px; border-radius: 8px; color: var(--muted); background: var(--bg); transition: background .25s, color .25s; }
.intro-flow span.on { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.intro-flow i { color: var(--muted); font-style: normal; }
.intro-stage { height: 190px; border-radius: 14px; background: var(--bg); position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; padding: 14px; }
.intro-stage > div { width: 100%; max-width: 330px; }
.intro h2 { margin: 0; font-family: var(--f-display); font-size: 22px; line-height: 1.25; }
.intro p.intro-txt { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.5; min-height: 4.5em; }
.intro-foot { display: flex; align-items: center; gap: 8px; }
.intro-dots { display: flex; gap: 6px; margin-right: auto; }
.intro-dots i { width: 8px; height: 8px; border-radius: 50%; background: var(--line); }
.intro-dots i.on { background: var(--accent); width: 20px; border-radius: 4px; }
/* scene 1: typing then a result card */
.i-input { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; font-size: 15px; min-height: 22px; display: flex; align-items: center; gap: 8px; }
.i-input b { font-weight: 500; }
.i-caret { width: 2px; height: 18px; background: var(--accent); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.i-btn { margin-left: auto; font-size: 12px; font-weight: 600; background: var(--accent); color: var(--accent-ink); border-radius: 7px; padding: 4px 9px; transition: transform .15s; }
.i-btn.press { transform: scale(.92); }
.i-card { margin-top: 10px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 14px; opacity: 0; transform: translateY(8px); transition: opacity .35s, transform .35s; }
.i-card.show { opacity: 1; transform: none; }
.i-card .w { font-family: var(--f-display); font-weight: 700; font-size: 16px; }
.i-card .m { color: var(--muted); font-size: 12px; }
.i-card .tr { color: var(--accent); font-weight: 600; }
/* scene 2: the card drops into the list */
.i-list { display: flex; flex-direction: column; gap: 6px; }
.i-row { display: flex; align-items: center; gap: 8px; background: var(--surface); border: 1px solid var(--line); border-radius: 9px; padding: 7px 10px; font-size: 13px; }
.i-row .n { font-family: var(--f-mono); color: var(--muted); font-size: 11px; width: 1.6em; }
.i-row .tr { margin-left: auto; color: var(--muted); }
.i-row.new { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); opacity: 0; transform: translateY(-26px) scale(.96); transition: opacity .4s, transform .5s cubic-bezier(.2,.9,.3,1.2); }
.i-row.new.show { opacity: 1; transform: none; }
.i-book { font-size: 11.5px; color: var(--muted); display: flex; justify-content: space-between; align-items: center; margin-bottom: 2px; }
.i-badge { font-size: 10.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--accent); background: var(--accent-soft); border-radius: 99px; padding: 2px 8px; }
/* scene 3: flashcard */
.i-flash { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px; text-align: center; }
.i-flash .w { font-family: var(--f-display); font-weight: 700; font-size: 20px; }
.i-flash .w .art { color: var(--die); }
.i-timer { height: 4px; background: var(--line); border-radius: 2px; margin: 6px 0 10px; overflow: hidden; }
.i-timer i { display: block; height: 100%; width: 100%; background: var(--accent); transform-origin: left; transition: transform 2.2s linear; }
.i-timer.run i { transform: scaleX(.45); }
.i-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.i-opts span { border: 1px solid var(--line); border-radius: 8px; padding: 6px; font-size: 13px; transition: background .25s, border-color .25s, color .25s; }
.i-opts span.ok { background: #e3f3e7; border-color: var(--easy); color: var(--easy); font-weight: 600; }
.i-ex { font-size: 12.5px; color: var(--muted); margin-top: 8px; opacity: 0; transition: opacity .4s; }
.i-ex.show { opacity: 1; }
.i-ex b { color: var(--ink); font-weight: 500; display: block; }
.i-tap { position: absolute; width: 22px; height: 22px; border-radius: 50%; background: rgba(31,95,115,.35); border: 2px solid var(--accent); opacity: 0; pointer-events: none; transition: opacity .2s, left .6s, top .6s; }
.i-tap.show { opacity: 1; }
@media (max-width: 480px) { .intro-flow { font-size: 11px; gap: 1px; } .intro-flow span { white-space: nowrap; padding-inline: 1px; } .intro-flow i { font-size: 10px; } .i-gram .sg-txt { font-size: 12.5px; } .i-gram .sx { gap: 4px; } .intro-box { padding: 18px 16px 14px; } .intro h2 { font-size: 20px; } .intro-stage { height: 180px; } .i-list .i-row:nth-child(4) { display: none; } }
@media (prefers-reduced-motion: reduce) { .intro * { transition: none !important; animation: none !important; } }
/* scene 4: the printable A8 card turning over (front, then back) */
.i-print { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.i-flipbox { perspective: 900px; }
.i-flip { position: relative; width: 280px; height: 197px; transform-origin: 0 0; transform: scale(var(--s, .7)); transform-style: preserve-3d; }
.i-face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; transition: transform .7s ease; }
.i-face.i-back { transform: rotateY(180deg); }
.i-flip.flipped .i-face { transform: rotateY(-180deg); }
.i-flip.flipped .i-face.i-back { transform: rotateY(0deg); }
.i-print .pc.pc-screen { box-shadow: 0 4px 14px rgba(0,0,0,.12); }
/* scene 4: a sentence broken down group by group (same look as the Grammar tab, smaller) */
.i-gram { text-align: center; }
.i-gsent { margin: 0; font-family: var(--f-display); font-size: 15px; color: var(--ink); }
.i-gtr { margin: 2px 0 8px; font-size: 12px; color: var(--muted); }
.i-gram .sx { justify-content: center; gap: 6px 6px; padding: 0; flex-wrap: nowrap; }
.i-gram .sg { max-width: none; }
.i-gram .sg-top { min-height: 34px; gap: 2px; }
.i-gram .sg-top .pill { font-size: 8.5px; padding: 1px 6px; }
.i-gram .sg-top .fn { font-size: 10px; }
.i-gram .sg-txt { font-size: 14px; padding: 0 4px 3px; white-space: nowrap; }
.i-seg { opacity: 0; transform: translateY(6px); transition: opacity .4s, transform .4s; }
.i-seg.show { opacity: 1; transform: none; }
/* step « RoamCab » : a taxi drives to a passenger, then to a destination in German */
.i-taxi-map { position: relative; width: min(100%, 340px); aspect-ratio: 300 / 160; }
.i-taxi-map svg { width: 100%; height: 100%; display: block; }
.i-taxi-map .i-badge { position: absolute; left: 8px; top: 8px; }
.i-car { position: absolute; left: 0; top: 0; width: 26px; height: 14px; margin: -7px 0 0 -13px; border-radius: 4px; background: #ffc919; box-shadow: 0 2px 4px rgba(0,0,0,.4), inset -6px 0 0 #1c2830, inset 6px 0 0 rgba(0,0,0,.12); transition: transform 1.2s linear; transform-origin: 13px 7px; }
.i-cl { position: absolute; left: 41%; top: 54%; width: 12px; height: 12px; border-radius: 50%; background: #ffc919; box-shadow: 0 0 0 5px rgba(255,201,25,.3); transition: opacity .3s, transform .3s; }
.i-cl.gone { opacity: 0; transform: scale(.4); }
.i-dest { position: absolute; right: 3%; top: 12%; font: 700 12px/1 var(--f-body); color: #62d48c; background: rgba(12,18,21,.8); border: 1.5px solid #62d48c; border-radius: 99px; padding: 4px 8px; opacity: .25; transition: opacity .3s; }
.i-dest.on { opacity: 1; }
.i-fare { position: absolute; left: 50%; top: 62%; transform: translate(-50%, 6px); font: 800 20px/1 var(--f-mono); color: #ffc919; text-shadow: 0 2px 6px rgba(0,0,0,.6); opacity: 0; transition: opacity .4s, transform .4s; }
.i-fare.show { opacity: 1; transform: translate(-50%, 0); }
@media (prefers-reduced-motion: reduce) { .i-car, .i-cl, .i-dest, .i-fare { transition: none; } }
@media (max-width: 520px) { .intro-flow { flex-wrap: wrap; justify-content: center; row-gap: 4px; font-size: 12px; } .intro-flow span { flex: none; padding: 5px 7px; } }