/* Flashcards "How it works" tutorial: a dialog with a three-card practice deck. Tokens from site.css only. */

body.tut-open { overflow: hidden; }

.tut-backdrop {
    position: fixed; inset: 0; z-index: 160;
    display: grid; place-items: center; padding: var(--space-4);
    background: rgba(8, 52, 62, .55);
    -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px);
    overflow-y: auto;
}

.tut {
    width: min(100%, 30rem);
    max-height: calc(100dvh - 2 * var(--space-4));
    overflow-y: auto;
    padding: var(--space-5);
    border-radius: var(--r-xl);
    background: var(--sand-soft);
    border: 1px solid rgba(58, 36, 24, .1);
    box-shadow: var(--shadow-lift);
    color: var(--koa);
    text-align: center;
}

.tut-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-3); }
.tut-head h2 { font-size: 1.4rem; margin: 0; text-align: left; flex: 1; }
.tut-head h2:focus { outline: none; }
.tut-close {
    flex: none; width: 44px; height: 44px; border: 0; border-radius: 50%;
    background: var(--ocean-mist); color: var(--ocean-deep); font-size: 1.5rem; line-height: 1;
    transition: background-color .2s, transform .3s var(--spring);
}
.tut-close:hover { background: var(--ocean-mist-deep); transform: rotate(90deg); }

.tut-step-label { margin: 0; font-size: .75rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--terracotta-dark); }
.tut-step-text { margin: var(--space-2) 0 var(--space-4); min-height: 4.4em; font-size: 1.05rem; line-height: 1.45; color: var(--koa); }

.tut-stage { display: flex; flex-direction: column; align-items: center; gap: var(--space-4); }

/* the practice card (same look as the home page demo card) */
.tut-card {
    perspective: 900px; width: min(100%, 16rem); padding: 0; border: 0; background: none;
    font: inherit; color: inherit; border-radius: var(--r-lg);
    transition: transform .25s var(--ease), opacity .25s; touch-action: pan-y;
}
.tut-card.fly-right { transform: translateX(120%) rotate(18deg); opacity: 0; }
.tut-card.fly-left { transform: translateX(-120%) rotate(-18deg); opacity: 0; }
.tut-card-inner { position: relative; display: block; height: 9.5rem; transition: transform .5s var(--ease); transform-style: preserve-3d; }
.tut-card.no-anim .tut-card-inner { transition: none; }
.tut-card.is-flipped .tut-card-inner { transform: rotateY(180deg); }
.tut-face {
    position: absolute; inset: 0; display: grid; place-items: center; padding: var(--space-3);
    border-radius: var(--r-lg); border: 3px solid var(--ocean); box-shadow: var(--shadow-soft);
    font-family: var(--font-display); font-size: 2.2rem; font-weight: 700; color: var(--ocean-deep); line-height: 1.1;
    backface-visibility: hidden; -webkit-backface-visibility: hidden;
}
.tut-front { background: var(--sand); }
.tut-back { background: var(--ocean-mist); transform: rotateY(180deg); font-size: 1.7rem; }

.tut-grade { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); width: 100%; }
.tut-grade-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 48px; padding: 0 var(--space-3);
    border-radius: var(--r-pill); border: 2px solid transparent; color: #fff; font: 600 1rem var(--font-body);
    transition: transform .3s var(--spring), opacity .2s;
}
.tut-yes { background: var(--success); }
.tut-no { background: var(--danger); }
.tut-grade-btn:hover { transform: none; }

.tut-nav { display: flex; justify-content: center; gap: var(--space-3); }
.tut-icon {
    width: 48px; height: 48px; display: grid; place-items: center; padding: 0;
    border: 3px solid var(--koa-soft); border-radius: 14px; background: var(--sand); box-shadow: 0 4px 0 var(--koa-soft);
    transition: transform .2s, opacity .2s;
}
.tut-icon img { width: 24px; height: 24px; }
.tut-icon:hover { transform: translateY(-2px); }

/* controls that are not part of the current step */
.tut [aria-disabled="true"]:not(.tut-card) { opacity: .4; cursor: not-allowed; }
.tut [aria-disabled="true"]:not(.tut-card):hover { transform: none; }

/* spotlight: a ring that pulses on the control to use next */
.tut .is-spot { box-shadow: 0 0 0 4px var(--plumeria), 0 0 0 8px rgba(165, 72, 31, .35); animation: tut-pulse 1.6s ease-in-out infinite; }
.tut .tut-icon.is-spot { box-shadow: 0 4px 0 var(--koa-soft), 0 0 0 4px var(--plumeria), 0 0 0 8px rgba(165, 72, 31, .35); animation-name: tut-pulse-icon; }
@keyframes tut-pulse { 50% { box-shadow: 0 0 0 7px var(--plumeria), 0 0 0 13px rgba(165, 72, 31, .15); } }
@keyframes tut-pulse-icon { 50% { box-shadow: 0 4px 0 var(--koa-soft), 0 0 0 7px var(--plumeria), 0 0 0 13px rgba(165, 72, 31, .15); } }

.tut-done h3 { font-size: 1.5rem; margin-bottom: var(--space-2); }
.tut-done p { color: var(--koa-soft); }
.tut-keys { margin: var(--space-4) 0; display: grid; gap: var(--space-2); text-align: left; }
.tut-keys > div { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); padding: var(--space-2) var(--space-4); border-radius: var(--r-md); background: var(--ocean-mist); }
.tut-keys dt { font-weight: 700; color: var(--ocean-deep); }
.tut-keys dd { margin: 0; color: var(--koa); }
.tut-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-3); }

.tut-foot { margin: var(--space-4) 0 0; font-size: .85rem; color: var(--koa-soft); }

.tut :focus-visible { outline: 3px solid var(--terracotta); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
    .tut .is-spot { animation: none; }
    .tut-card, .tut-card-inner, .tut-close, .tut-grade-btn, .tut-icon { transition: none; }
    .tut-close:hover, .tut-grade-btn:hover, .tut-icon:hover { transform: none; }
}