/* A quiet, optional fold inside the travel passport. All selectors stay scoped. */
.challenge{margin:26px 0 0;border:1px solid #d5d5c2;border-radius:6px;background:#f9f7ed;color:#19382e;font-size:.88rem;line-height:1.75;min-width:0;scroll-margin-top:24px}
.challenge,.challenge *{box-sizing:border-box}
.challenge [hidden]{display:none!important}
.challenge>summary{display:flex;align-items:center;gap:13px;width:100%;min-height:66px;padding:14px 18px;list-style:none;cursor:pointer;font-weight:400;border-radius:5px}
.challenge>summary::-webkit-details-marker{display:none}
.challenge>summary::marker{content:""}
.challenge>summary:hover{background:#f0f0e2}
.challenge[open]>summary{border-bottom:1px dashed #d0d2bf;border-radius:5px 5px 0 0}
.challenge-mark{width:34px;height:34px;flex:0 0 34px;fill:none;stroke:#806032;stroke-width:1.3;stroke-linecap:round;stroke-linejoin:round}
.challenge-summary-copy{display:flex;align-items:baseline;flex-wrap:wrap;gap:3px 20px;min-width:0}
.challenge-title{font:700 1.05rem/1.65 "Noto Serif TC","PMingLiU","Songti TC",serif;letter-spacing:.04em}
.challenge-summary-note{font-size:.77rem;line-height:1.65;color:#505f53}
.challenge-chevron{margin-left:auto;flex:0 0 18px;text-align:center;font:1.4rem/1 Georgia,serif;color:#806032;transform:translateY(-2px);transition:transform .15s ease}
.challenge[open] .challenge-chevron{transform:rotate(180deg) translateY(-2px)}
.challenge-body{padding:clamp(18px,3vw,28px);max-width:800px;margin-inline:auto;overflow-wrap:anywhere}
.challenge .challenge-eyebrow{margin:0 0 8px;color:#806032;font-size:.65rem;font-weight:700;letter-spacing:.16em}
.challenge h3{font:700 1.2rem/1.65 "Noto Serif TC","PMingLiU","Songti TC",serif;letter-spacing:.015em;margin:0 0 14px;color:#19382e}
.challenge p{margin:0 0 15px;line-height:1.8}
.challenge-intro>p:not(.challenge-eyebrow){color:#505f53;font-size:.86rem}
.challenge button{font:inherit;line-height:1.6;touch-action:manipulation;cursor:pointer}
.challenge .challenge-button{display:inline-flex;align-items:center;justify-content:center;gap:18px;min-height:44px;max-width:100%;padding:10px 17px;border:1px solid #244d3f;border-radius:4px;background:#244d3f;color:#fffcf4;font-size:.86rem;font-weight:650;white-space:normal}
.challenge .challenge-button:hover:not(:disabled){background:#19382e}
.challenge .challenge-button:disabled{background:#e5e7db;color:#55604d;border-color:#acb29e;cursor:wait}
.challenge .challenge-load-state{margin:14px 0;color:#655336;font-size:.82rem}
.challenge-meta{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px 14px;color:#505f53}
.challenge-meta p{margin:0;font-size:.76rem}
.challenge-meta p:last-child{color:#244d3f;font-weight:650}
.challenge .challenge-progress{display:block;appearance:none;-webkit-appearance:none;width:100%;height:4px;margin:10px 0 23px;border:0;border-radius:8px;background:#e4e5d6;overflow:hidden;color:#6d805c}
.challenge-progress::-webkit-progress-bar{background:#e4e5d6;border-radius:8px}
.challenge-progress::-webkit-progress-value{background:#6d805c;border-radius:8px}
.challenge-progress::-moz-progress-bar{background:#6d805c;border-radius:8px}
.challenge-options{display:grid;gap:10px;list-style:none;padding:0;margin:0 0 18px}
.challenge-options>li{min-width:0}
.challenge .challenge-option{display:grid;grid-template-columns:26px minmax(0,1fr);align-items:center;gap:4px 12px;width:100%;min-height:54px;padding:12px 15px;border:1px solid #c6ccbb;border-radius:5px;background:#fffcf4;color:#19382e;text-align:left;white-space:normal;transition:background-color .15s ease,border-color .15s ease}
.challenge .challenge-option:hover:not(:disabled){background:#eff1e3;border-color:#6d805c}
.challenge-option-letter{display:grid;place-items:center;width:25px;height:25px;border:1px solid #c8cdbb;border-radius:50%;font:500 .85rem/1 Georgia,serif;color:#647057}
.challenge-option-text{font-size:.88rem;line-height:1.8}
.challenge-option-state{grid-column:2;font-size:.7rem;line-height:1.6;font-weight:650}
.challenge .challenge-option:disabled{cursor:default;opacity:1}
.challenge .challenge-option[data-result="correct"]{background:#e9eee0;border-color:#647d54;color:#244d3f}
.challenge-option[data-result="correct"] .challenge-option-letter{background:#244d3f;border-color:#244d3f;color:#fffcf4}
.challenge .challenge-option[data-result="wrong"]{background:#f4ece0;border-color:#c1a77f;color:#695338}
.challenge .challenge-option[data-result="muted"]{background:#f7f6ed;color:#64705e;border-color:#d8dbcd}
.challenge-answer{padding:18px 19px;background:#eef0e3;border-left:3px solid #8b9c6c;border-radius:0 4px 4px 0}
.challenge .challenge-feedback{margin:0 0 9px;font-size:.88rem;font-weight:700;color:#244d3f}
.challenge .challenge-explanation{margin:0 0 10px;font-size:.84rem;color:#505f53}
.challenge-links{display:flex;flex-wrap:wrap;gap:0 20px;align-items:center}
.challenge-links a{display:inline-flex;align-items:center;min-height:44px;max-width:100%;font-size:.78rem;color:#244d3f;text-decoration-thickness:1px;text-underline-offset:4px}
.challenge .challenge-add{display:inline-flex;align-items:center;justify-content:center;gap:12px;max-width:100%;min-height:44px;margin-top:8px;padding:8px 12px;background:transparent;color:#244d3f;border:1px solid #87967a;border-radius:4px;font-size:.8rem;white-space:normal}
.challenge .challenge-add:hover{background:#e1e7d4}
.challenge-next-row{display:flex;justify-content:flex-end;margin-top:18px}
.challenge-finish{padding-block:6px}
.challenge .challenge-result{display:flex;align-items:baseline;flex-wrap:wrap;gap:10px;margin:0 0 15px;color:#505f53;font-size:.8rem}
.challenge-result strong{font:500 2.5rem/1.3 Georgia,serif;letter-spacing:.02em;color:#244d3f}
.challenge #challenge-finish-note{font-size:.86rem;color:#505f53}
.challenge-review{margin:22px 0 0;padding-top:15px;border-top:1px dashed #d0d2bf;font-size:.84rem;color:#244d3f}
.challenge-review>summary{width:100%;min-height:44px;padding:9px 0;font-size:.86rem;font-weight:650;cursor:pointer}
.challenge-review-list{list-style:none;margin:8px 0 0;padding:0}
.challenge-review-item{padding:18px 0;border-top:1px solid #d9dccc}
.challenge-review-item:last-child{padding-bottom:0}
.challenge-review-item h4{margin:0 0 9px;font:700 1rem/1.7 "Noto Serif TC","PMingLiU","Songti TC",serif;color:#244d3f}
.challenge .challenge-review-question{margin:0 0 7px;font-size:.82rem;color:#505f53}
.challenge .challenge-review-answer{margin:0 0 9px;font-size:.83rem;font-weight:650;color:#244d3f}
.challenge .challenge-review-choice{margin:0 0 9px;font-size:.75rem;color:#695338}
.challenge .challenge-small{margin:22px 0 0;padding-top:15px;border-top:1px dashed #d0d2bf;font-size:.7rem;line-height:1.85;color:#65705d}
.challenge summary:focus-visible,.challenge button:focus-visible,.challenge a:focus-visible,.challenge [tabindex="-1"]:focus-visible{outline:3px solid #a75326;outline-offset:4px}
@media(max-width:540px){.challenge>summary{padding:13px 12px;gap:9px}.challenge-summary-copy{display:block}.challenge-summary-note{display:block;margin-top:2px}.challenge-title{font-size:1rem}.challenge-mark{width:29px;height:29px;flex-basis:29px}.challenge-body{padding:20px 14px}.challenge .challenge-option{padding:12px 11px;gap:3px 9px}.challenge-answer{padding:15px 12px}}
@media(max-width:380px){.challenge-title{font-size:.94rem;letter-spacing:0}.challenge-summary-note{font-size:.69rem}.challenge>summary{gap:7px;padding-inline:10px}.challenge-mark{width:25px;height:25px;flex-basis:25px}.challenge-body{padding-inline:12px}.challenge .challenge-button{width:100%;gap:10px;padding-inline:10px}.challenge .challenge-option{grid-template-columns:22px minmax(0,1fr);gap:4px 8px}.challenge-option-letter{width:22px;height:22px;font-size:.78rem}.challenge-option-text{font-size:.82rem}.challenge h3{font-size:1.1rem}.challenge-links{gap:0 12px}.challenge .challenge-add{width:100%}}
@media(prefers-reduced-motion:reduce){.challenge *,.challenge *::before,.challenge *::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.challenge{display:none!important}}