/* ==========================================================================
   Colour by Number
   ========================================================================== */

.studio {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(300px, .92fr);
    gap: clamp(16px, 2.6vw, 26px);
    padding: clamp(14px, 3vw, 26px) 0 clamp(30px, 5vw, 48px);
    align-items: start;
}

/* ── Picture chooser ─────────────────────────────────────────────────── */
.picker {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    padding: 8px;
    border-radius: var(--r-pill);
    background: rgba(255, 255, 255, .8);
    box-shadow: var(--shadow-s);
    margin-bottom: clamp(12px, 2vw, 18px);
    grid-column: 1 / -1;
}

.picker__btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 20px;
    min-height: 46px;
    border-radius: var(--r-pill);
    font-family: 'Fredoka', sans-serif;
    color: var(--ink-soft);
    transition: transform .2s var(--ease-bounce), background .2s, color .2s, box-shadow .2s;
    -webkit-tap-highlight-color: transparent;
}
.picker__btn:hover { background: #fff; transform: translateY(-2px); }
.picker__btn[aria-pressed="true"] {
    background: linear-gradient(140deg, var(--grape), var(--grape-deep));
    color: #fff;
    box-shadow: 0 6px 16px rgba(122, 90, 248, .38);
}
.picker__btn em { font-style: normal; font-size: 1.2rem; }

/* ── Drawing stage ───────────────────────────────────────────────────── */
.sheet {
    position: relative;
    padding: clamp(14px, 2.4vw, 22px);
    border-radius: var(--r-lg);
    background: #fff;
    box-shadow: var(--shadow-m);
}

.sheet__paper {
    border-radius: var(--r-md);
    background:
        repeating-linear-gradient(45deg, rgba(122,90,248,.03) 0 12px, transparent 12px 24px),
        linear-gradient(160deg, #FFFDF7 0%, #FFF9FE 100%);
    border: 2px dashed var(--line);
    padding: clamp(6px, 1.5vw, 12px);
}

.sheet__svg { width: 100%; height: auto; display: block; touch-action: manipulation; }

.sheet__svg .zone {
    fill: #FFFFFF;
    stroke: #2B2440;
    stroke-width: 3.4;
    stroke-linejoin: round;
    cursor: pointer;
    transition: fill .3s var(--ease-out), filter .18s;
}
.sheet__svg .zone:hover { filter: brightness(.95); }
.sheet__svg .zone.is-filled { cursor: default; }
.sheet__svg .zone.is-wrong { animation: zoneShake .45s; }
.sheet__svg .zone.is-just-filled { animation: zonePop .45s var(--ease-bounce); }

.sheet__svg .ink {
    fill: none;
    stroke: #2B2440;
    stroke-width: 3.4;
    stroke-linecap: round;
    stroke-linejoin: round;
    pointer-events: none;
}

.sheet__svg .zone-label {
    font-family: 'Fredoka', sans-serif;
    font-size: 21px;
    fill: #6B6591;
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
    transition: opacity .3s;
}
.sheet__svg .zone-label.is-hidden { opacity: 0; }

@keyframes zoneShake {
    0%, 100% { transform: translateX(0); }
    25%      { transform: translateX(-5px); }
    50%      { transform: translateX(5px); }
    75%      { transform: translateX(-3px); }
}
@keyframes zonePop {
    0%   { transform: scale(1); }
    45%  { transform: scale(1.04); }
    100% { transform: scale(1); }
}

/* Progress bar under the picture */
.sheet__foot {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 14px;
}
.bar {
    flex: 1 1 160px;
    height: 14px;
    border-radius: var(--r-pill);
    background: var(--line);
    overflow: hidden;
}
.bar__fill {
    height: 100%;
    width: 0;
    border-radius: var(--r-pill);
    background: linear-gradient(90deg, var(--mint), var(--sky));
    transition: width .4s var(--ease-out);
}
.sheet__count { font-family: 'Fredoka', sans-serif; font-size: .95rem; color: var(--ink-soft); }

/* ── Colour key ──────────────────────────────────────────────────────── */
.key {
    display: grid;
    gap: clamp(14px, 2vw, 18px);
    padding: clamp(18px, 2.6vw, 24px);
    border-radius: var(--r-lg);
    background: #fff;
    box-shadow: var(--shadow-m);
    position: sticky;
    top: 84px;
}

.key__title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Fredoka', sans-serif;
    font-size: 1.02rem;
    margin-bottom: 12px;
}
.key__title small {
    margin-left: auto;
    font-family: 'Nunito', sans-serif;
    font-size: .78rem;
    font-weight: 800;
    color: var(--ink-faint);
}

.key__list { display: grid; gap: 10px; }

.key__item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--r-sm);
    background: var(--surface-2);
    border: 3px solid transparent;
    transition: transform .2s var(--ease-bounce), border-color .2s, background .2s;
    -webkit-tap-highlight-color: transparent;
}
.key__item:hover { transform: translateX(3px); background: #fff; }
.key__item[aria-pressed="true"] {
    background: #fff;
    box-shadow: var(--shadow-s);
}
.key__item[aria-pressed="true"] .key__num { transform: scale(1.08); }
.key__item.is-nudge { animation: zoneShake .5s; }

.key__num {
    display: grid;
    place-items: center;
    width: 46px; height: 46px;
    flex: 0 0 auto;
    border-radius: 14px;
    font-family: 'Fredoka', sans-serif;
    font-size: 1.4rem;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, .25);
    box-shadow: var(--shadow-s);
    transition: transform .2s var(--ease-bounce);
}
.key__label { font-family: 'Fredoka', sans-serif; font-size: 1.02rem; }
.key__left {
    margin-left: auto;
    font-size: .8rem;
    font-weight: 800;
    color: var(--ink-faint);
}
.key__item.is-complete .key__left { color: var(--mint-deep); }

.key__hint {
    font-size: .9rem;
    font-weight: 800;
    color: var(--ink-soft);
    text-align: center;
    min-height: 2.6em;
}
.key__hint.is-oops { color: var(--sunny-deep); }
.key__hint.is-happy { color: var(--mint-deep); }

.key__actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.key__actions .btn { width: 100%; padding-inline: 12px; }
.key__actions .btn--wide { grid-column: 1 / -1; }

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 900px) {
    .studio { grid-template-columns: 1fr; }
    .key { position: static; }
    .sheet__paper { max-width: 520px; margin-inline: auto; }
}

@media (max-width: 420px) {
    .key__actions { grid-template-columns: 1fr; }
    .picker__btn { padding: 10px 14px; font-size: .93rem; }
}