/* How Big Is the Universe - Kids Kingdom (scoped under .kk-uz; EN + HI) */
.kk-uz {max-width: 1240px; margin: 0 auto; display: flex; flex-direction: column; gap: 22px;}
.kk-uz .card {background: #fff; border-radius: 20px; padding: 22px; box-shadow: 0 10px 30px rgba(0,0,0,0.08);}
.kk-uz .card-head {display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px;}
.kk-uz .card-head h3 {font-size: 19px; color: #1f2937; margin: 0;}
.kk-uz .card-head h3 small {font-size: 12px; color: #6b7280; font-weight: 600; margin-left: 8px;}
.kk-uz .head-actions {display: flex; gap: 8px; flex-wrap: wrap;}
.kk-uz .muted {color: #6b7280; font-weight: 500; font-size: 12px;}
.kk-uz .lbl {display: block; font-size: 13px; font-weight: 700; color: #374151; margin-bottom: 8px;}
.kk-uz .txt {width: 100%; box-sizing: border-box; padding: 11px 12px; border: 2px solid #e5e7eb; border-radius: 10px; font-size: 14px; font-weight: 600; background: #fff; font-family: inherit;}
.kk-uz .txt:focus {outline: none; border-color: #8b5cf6;}
.kk-uz .seg {display: inline-flex; background: #f3f4f6; border-radius: 10px; padding: 3px; gap: 3px; flex-wrap: wrap;}
.kk-uz .seg button {flex: 1 1 auto; border: none; background: transparent; padding: 8px 14px; border-radius: 8px; font-weight: 700; font-size: 13px; color: #4b5563; cursor: pointer; transition: all .2s; white-space: nowrap;}
.kk-uz .seg button:hover {color: #8b5cf6;}
.kk-uz .seg button.active {background: #fff; color: #8b5cf6; box-shadow: 0 2px 8px rgba(0,0,0,0.12);}
.kk-uz .code-tabs {display: flex; gap: 4px; flex-wrap: wrap; background: #f3f4f6; padding: 3px; border-radius: 10px;}
.kk-uz .code-tabs button {border: none; background: transparent; padding: 8px 14px; border-radius: 8px; font-weight: 700; font-size: 13px; color: #4b5563; cursor: pointer;}
.kk-uz .code-tabs button.active {background: #fff; color: #8b5cf6; box-shadow: 0 2px 8px rgba(0,0,0,0.12);}
.kk-uz .code-box {width: 100%; box-sizing: border-box; background: #0f172a; color: #e2e8f0; border: none; border-radius: 12px; padding: 16px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12.5px; line-height: 1.6; resize: vertical; white-space: pre; overflow: auto;}
.kk-uz .code-foot {display: flex; justify-content: flex-end; gap: 10px; margin-top: 12px;}
.kk-uz .btn {padding: 12px 24px; border-radius: 10px; border: none; cursor: pointer; font-weight: 700; font-size: 14px; transition: all 0.3s; display: inline-flex; align-items: center; justify-content: center; gap: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); font-family: inherit;}
.kk-uz .btn:hover:not(:disabled) {transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.15);}
.kk-uz .btn:disabled {opacity: .45; cursor: not-allowed;}
.kk-uz .btn-primary {background: linear-gradient(135deg, #0b1030 0%, #6d28d9 100%); color: white;}
.kk-uz .btn-ghost {background: white; border: 2px solid rgba(0,0,0,0.1); color: #1f2937;}
.kk-uz .btn-ghost:hover:not(:disabled) {border-color: #8b5cf6; color: #8b5cf6;}
.kk-uz .btn-sm {padding: 8px 14px; font-size: 13px;}
.kk-uz .btn-xs {padding: 6px 10px; font-size: 12px; border-radius: 8px; box-shadow: none;}
.kk-uz .link-btn {border: none; background: none; color: #8b5cf6; font-weight: 700; font-size: 13px; cursor: pointer; padding: 0; font-family: inherit;}
.kk-uz .link-btn:hover {text-decoration: underline;}
.kk-uz .uz-toast {position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 30px); background: #111827; color: #fff; padding: 12px 22px; border-radius: 12px; font-weight: 700; font-size: 14px; opacity: 0; pointer-events: none; transition: all .3s; z-index: 9999; max-width: 90vw; text-align: center;}
.kk-uz .uz-toast.show {opacity: 1; transform: translate(-50%, 0);}
.kk-uz .card {margin-bottom: 0;}
.kk-uz {display: flex; flex-direction: column; gap: 22px;}
.kk-uz .mt {margin-top: 16px;}
.kk-uz .two-col {display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 22px; align-items: start;}
.kk-uz .stage {position: relative; height: clamp(500px, 74vh, 780px); border-radius: 20px; overflow: hidden; background: #02030a; box-shadow: 0 10px 30px rgba(0,0,0,.3); touch-action: pan-y; user-select: none; -webkit-user-select: none;}
.kk-uz .stage:fullscreen {height: 100vh; border-radius: 0;}
.kk-uz .stage canvas {position: absolute; inset: 0; width: 100%; height: 100%; display: block;}
.kk-uz .loader {position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; text-align: center; padding: 24px; color: #cbd5e1; font-weight: 700; background: #02030a; z-index: 6;}
.kk-uz .ui {position: absolute; z-index: 3;}
.kk-uz .ui.top {top: 12px; right: 12px; display: flex; gap: 8px; align-items: center;}
.kk-uz .tb {background: rgba(12,14,34,.72); color: #f1f5f9; border: 1px solid rgba(255,255,255,.18); border-radius: 10px; padding: 8px 12px; font-size: 13.5px; font-weight: 700; cursor: pointer; font-family: inherit; transition: all .15s;}
.kk-uz .tb:hover {background: rgba(99,102,241,.8); border-color: #c7d2fe;}
.kk-uz .seg-mini {display: inline-flex; border: 1px solid rgba(255,255,255,.18); border-radius: 10px; overflow: hidden;}
.kk-uz .seg-mini button {background: rgba(12,14,34,.72); color: #cbd5e1; border: none; padding: 8px 12px; font-size: 13px; font-weight: 800; cursor: pointer; font-family: inherit;}
.kk-uz .seg-mini button.active {background: #8b5cf6; color: #fff;}
.kk-uz .readout {top: 12px; left: 12px; background: rgba(12,14,34,.68); border: 1px solid rgba(255,255,255,.14); border-radius: 12px; padding: 9px 13px; color: #cbd5e1; font-size: 12.5px; max-width: 58%;}
.kk-uz .r-line {line-height: 1.65;}
.kk-uz .r-line b {color: #fff;}
.kk-uz .idea-badge {position: absolute; z-index: 3; top: 70px; left: 50%; transform: translateX(-50%); background: rgba(124,58,237,.85); color: #fff; font-weight: 900; letter-spacing: 1.2px; font-size: 12px; padding: 5px 14px; border-radius: 999px; border: 1px solid #ddd6fe; opacity: 0; pointer-events: none; transition: opacity .4s; white-space: nowrap;}
.kk-uz .stage.idea .idea-badge {opacity: 1;}
.kk-uz .lvcard {left: 12px; bottom: 44px; width: min(440px, calc(100% - 24px)); background: rgba(8,10,28,.84); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,.16); border-radius: 16px; padding: 14px 16px; color: #e2e8f0;}
.kk-uz .lv-head {display: flex; gap: 11px; align-items: center; margin-bottom: 7px;}
.kk-uz .lv-ico {font-size: 30px; line-height: 1;}
.kk-uz .lv-tt {flex: 1; min-width: 0;}
.kk-uz .lv-tg {background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); color: #e2e8f0; border-radius: 8px; width: 28px; height: 28px; cursor: pointer; font-size: 14px; flex: 0 0 auto;}
.kk-uz .lvcard.min p, .kk-uz .lvcard.min .lv-extra, .kk-uz .lvcard.min .lv-fact {display: none;}
.kk-uz .lvcard.min .lv-head {margin-bottom: 0;}
.kk-uz .lvcard h3 {margin: 0; font-size: 19px; color: #fff; line-height: 1.25;}
.kk-uz .lv-size {font-size: 12.5px; font-weight: 800; color: #a5b4fc; margin-top: 2px;}
.kk-uz .lvcard p {margin: 0 0 8px; font-size: 13.5px; line-height: 1.6; color: #cbd5e1;}
.kk-uz .lv-extra {font-size: 13px; font-weight: 800; color: #fde68a; margin-bottom: 6px;}
.kk-uz .lv-extra:empty {display: none;}
.kk-uz .lv-fact {font-size: 12.5px; line-height: 1.55; color: #c7d2fe; background: rgba(99,102,241,.16); border-radius: 10px; padding: 7px 10px;}
.kk-uz .hint {position: absolute; z-index: 2; right: 14px; bottom: 12px; color: rgba(226,232,240,.5); font-size: 12px; font-weight: 600; pointer-events: none; text-align: right; max-width: 45%;}
.kk-uz .ctl {padding-bottom: 18px;}
.kk-uz .slider-wrap {margin-bottom: 14px;}
.kk-uz .sl-ends {display: flex; justify-content: space-between; font-size: 13px; font-weight: 800; color: #6d28d9; margin-bottom: 6px;}
.kk-uz .sl-track {position: relative; height: 34px;}
.kk-uz .sl-track::before {content: ''; position: absolute; left: 0; right: 0; top: 13px; height: 8px; border-radius: 6px; background: linear-gradient(90deg, #1e1b4b, #4c1d95, #1d4ed8, #0e7490, #15803d); opacity: .35;}
.kk-uz .sl-fill {position: absolute; left: 0; top: 13px; height: 8px; border-radius: 6px; background: linear-gradient(90deg, #8b5cf6, #a78bfa); pointer-events: none;}
.kk-uz .ticks {position: absolute; left: 0; right: 0; top: 0; height: 34px; pointer-events: none;}
.kk-uz .ticks i {position: absolute; top: 9px; width: 6px; height: 16px; margin-left: -3px; border-radius: 3px; background: rgba(67,56,202,.55); pointer-events: auto; cursor: pointer;}
.kk-uz .ticks i:hover {background: #f59e0b;}
.kk-uz .sl-track input[type="range"] {position: absolute; left: 0; top: 0; width: 100%; height: 34px; margin: 0; background: transparent; -webkit-appearance: none; appearance: none; cursor: pointer; accent-color: #8b5cf6;}
.kk-uz .sl-track input[type="range"]::-webkit-slider-runnable-track {height: 34px; background: transparent;}
.kk-uz .sl-track input[type="range"]::-moz-range-track {height: 34px; background: transparent;}
.kk-uz .sl-track input[type="range"]::-webkit-slider-thumb {-webkit-appearance: none; appearance: none; width: 24px; height: 24px; margin-top: 5px; border-radius: 50%; background: #fff; border: 4px solid #8b5cf6; box-shadow: 0 2px 8px rgba(0,0,0,.35);}
.kk-uz .sl-track input[type="range"]::-moz-range-thumb {width: 18px; height: 18px; border-radius: 50%; background: #fff; border: 4px solid #8b5cf6; box-shadow: 0 2px 8px rgba(0,0,0,.35);}
.kk-uz .ctl-row {display: flex; flex-wrap: wrap; gap: 8px; align-items: center;}
.kk-uz .ctl-row.opts {margin-top: 12px; gap: 14px;}
.kk-uz .btn-play {border: 2px solid #8b5cf6; background: linear-gradient(135deg, #8b5cf6, #7c3aed); color: #fff; font-weight: 800; font-size: 14px; padding: 9px 18px; border-radius: 12px; cursor: pointer; font-family: inherit; transition: all .15s;}
.kk-uz .btn-play.alt {background: linear-gradient(135deg, #0ea5e9, #8b5cf6); border-color: #0ea5e9;}
.kk-uz .btn-play.ghost {background: #fff; color: #6d28d9; border-color: #c7d2fe;}
.kk-uz .btn-play:hover:not(:disabled) {filter: brightness(1.08); transform: translateY(-1px);}
.kk-uz .btn-play.on {box-shadow: 0 0 0 3px rgba(99,102,241,.35);}
.kk-uz .btn-play:disabled {opacity: .45; cursor: default;}
.kk-uz .chip-row {display: flex; gap: 8px; overflow-x: auto; padding: 8px 2px 4px; scrollbar-width: thin;}
.kk-uz .chip-row button {flex: 0 0 auto; border: 2px solid #e5e7eb; background: #f9fafb; color: #374151; font-weight: 700; font-size: 12.5px; padding: 7px 13px; border-radius: 999px; cursor: pointer; font-family: inherit; white-space: nowrap; transition: all .15s;}
.kk-uz .chip-row button:hover {border-color: #8b5cf6; background: #f5f3ff; color: #6d28d9;}
.kk-uz .chip-row button.active {background: #8b5cf6; border-color: #8b5cf6; color: #fff;}
.kk-uz .frow {margin-bottom: 12px;}
.kk-uz .frow .txt, .kk-uz .lbl .txt {width: 100%;}
.kk-uz .muted-p {font-size: 14px; color: #4b5563; line-height: 1.6; margin: 0 0 12px;}
.kk-uz .tr-out {background: #0b1030; border-radius: 14px; padding: 16px 18px; color: #e2e8f0;}
.kk-uz .tr-sub {font-size: 13px; color: #a5b4fc; font-weight: 700;}
.kk-uz .tr-val {font-size: 32px; font-weight: 900; color: #fde68a; margin: 4px 0; word-break: break-word;}
.kk-uz .tr-cmp {font-size: 14px; line-height: 1.6; color: #cbd5e1;}
.kk-uz .tr-cmp b {color: #fff;}
.kk-uz .quiz-n {font-size: 12px; font-weight: 800; color: #8b5cf6; letter-spacing: .5px;}
.kk-uz .quiz-q {font-size: 17px; font-weight: 800; color: #1f2937; margin: 6px 0 12px; line-height: 1.4;}
.kk-uz .quiz-opts {display: grid; gap: 8px;}
.kk-uz .opt {text-align: left; border: 2px solid #e5e7eb; background: #fff; border-radius: 12px; padding: 11px 14px; font-size: 14px; font-weight: 600; color: #374151; cursor: pointer; font-family: inherit; transition: all .15s;}
.kk-uz .opt:hover:not(:disabled) {border-color: #8b5cf6; background: #f5f3ff;}
.kk-uz .opt.right {border-color: #16a34a; background: #f0fdf4; color: #166534;}
.kk-uz .opt.wrong {border-color: #dc2626; background: #fef2f2; color: #991b1b;}
.kk-uz .opt:disabled {cursor: default;}
.kk-uz .quiz-fb {margin: 12px 0 10px; font-weight: 800; color: #1f2937;}
.kk-uz .quiz-done {text-align: center; padding: 10px 0;}
.kk-uz .quiz-done .big {font-size: 54px;}
.kk-uz .quiz-done h4 {margin: 8px 0 14px; font-size: 20px; color: #1f2937;}
@media (max-width: 860px) {
    .kk-uz .two-col {grid-template-columns: 1fr;}
}
@media (max-width: 640px) {
    .kk-uz .stage {height: 82vh; min-height: 540px;}
    .kk-uz .lvcard {bottom: 40px; left: 8px; width: calc(100% - 16px); padding: 11px 13px; max-height: 46%; overflow-y: auto;}
    .kk-uz .lvcard h3 {font-size: 16px;}
    .kk-uz .lvcard p {font-size: 12.5px;}
    .kk-uz .lv-fact {font-size: 12px;}
    .kk-uz .readout {max-width: 64%; font-size: 11.5px; padding: 7px 10px;}
    .kk-uz .hint {display: none;}
    .kk-uz .ctl-row .btn-play {padding: 8px 12px; font-size: 13px;}
}

/* ===== Kids Kingdom skin ===== */
.kk-uz, .kk-uz * { box-sizing: border-box; }
.kk-tool-section { max-width: 1240px; margin: 0 auto 36px; padding: 0 16px; }
.kk-uz { --kk-a: #8b5cf6; --kk-ad: #6d28d9; --kk-soft: #f3e8ff; --kk-line: #ddd6fe; font-family: inherit; position: relative; }
.kk-uz .card { border-radius: 28px; border: 3px solid var(--kk-line); box-shadow: 0 7px 0 var(--kk-line); background: #fff; }
.kk-uz .card-head h3 { font-weight: 900; }
.kk-uz .stage { border-radius: 28px; border: 4px solid var(--kk-a); box-shadow: 0 8px 0 var(--kk-ad); }
.kk-uz .btn, .kk-uz .tb, .kk-uz .seg-mini, .kk-uz .seg-mini button { border-radius: 999px; }
.kk-uz .btn { box-shadow: 0 4px 0 rgba(0,0,0,.18); font-weight: 800; }
.kk-uz .btn:active { transform: translateY(2px); box-shadow: 0 2px 0 rgba(0,0,0,.18); }
.kk-uz .presets button, .kk-uz .sq-row button, .kk-uz .opt, .kk-uz .seg, .kk-uz .seg button, .kk-uz .txt, .kk-uz .sel { border-radius: 999px; }
.kk-uz .opt { border-radius: 18px; border-width: 3px; }
.kk-uz .sq-out { border-radius: 22px; }
.kk-uz .tb { font-weight: 800; }
.kk-uz .gest { border-radius: 20px; }
.kk-uz .toast, .kk-uz .uz-toast { border-radius: 999px; }
.kk-uz input[type="range"] { accent-color: var(--kk-a); }
@media (max-width: 640px) { .kk-tool-section { padding: 0 10px; } .kk-uz .card { border-radius: 22px; padding: 16px; } .kk-uz .stage { border-radius: 22px; } }

/* language switch (sits in the hero) */
.kk-lang { display: inline-flex; gap: 4px; margin-top: 14px; padding: 4px; background: #fff; border: 3px solid #ddd6fe; border-radius: 999px; box-shadow: 0 4px 0 #ddd6fe; }
.kk-lang button { border: 0; background: transparent; padding: 7px 18px; border-radius: 999px; font: inherit; font-weight: 800; font-size: 14px; color: #475569; cursor: pointer; }
.kk-lang button:hover { color: #6d28d9; }
.kk-lang button.active { background: #8b5cf6; color: #fff; }