.isu-wrap{max-width:860px;margin:0 auto;padding:16px 12px 60px;text-align:center}
.isu-nav{text-align:left;margin:6px 0 10px}
.isu-nav a{color:#303545;font-size:1.1rem}
.isu-title{font-size:min(24px,5vw);margin:6px 0;color:#303545}
.isu-rule{color:#303545;font-size:min(20px,4vw);margin-bottom:12px;white-space:pre-line}
.isu-video{margin:10px auto 16px;max-width:560px}
.isu-video iframe{max-width:100%}
.isu-status{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:14px 0;color:#303545}
.isu-navbtn{background:transparent;border:0;padding:8px 10px;border-radius:5px;cursor:pointer;font:inherit;color:#303545}
.isu-navbtn:hover{background:#3949ab;color:#fff}
.isu-question{margin:12px 0 8px}
.isu-qtext{font-size:min(26px,5.2vw);color:#303545;margin:0 0 14px;white-space:pre-line;line-height:1.5}
.isu-opt{display:block;width:92%;margin:0 auto 12px;text-align:left;background:#fff;border:1px solid #d9dbe0;border-radius:6px;padding:10px 16px;font:inherit;font-size:min(20px,4.5vw);color:#303545;cursor:pointer;box-shadow:3px 3px 6px #adb0bb;transition:box-shadow .15s}
.isu-opt.is-picked{background:#f6e7ba;box-shadow:5px 7px 5px #ffc107}
.isu-opt.is-good{animation:isuGreen .8s infinite}
.isu-opt.is-bad{animation:isuRed .3s 5}
@keyframes isuGreen{0%{box-shadow:5px 7px 5px #0dfd0e}50%{box-shadow:0 0 12px 4px #68ff00}100%{box-shadow:0 0 12px 4px #ceffd3}}
@keyframes isuRed{0%{box-shadow:0 0 10px 4px #f63248}50%{box-shadow:0 0 10px 4px #ffcece}100%{box-shadow:0 0 10px 4px #c61010}}
.isu-blank{display:inline-block;font:inherit;font-weight:bold;text-align:center;padding:2px 6px;margin:2px;border:0;border-bottom:2px solid #4257b2;background:#fff;border-radius:4px;min-width:3ch;color:#303545}
.isu-blank.is-good{box-shadow:inset 0 4px 2px #0dfd0e,2px 2px 2px #0dfd0e}
.isu-blank.is-bad{box-shadow:inset 0 4px 2px #f63248,2px 2px 2px #f63248}
.isu-keys{margin:6px 0 10px}
.isu-keys button{font:inherit;font-size:1.2rem;min-width:44px;height:44px;margin:3px;border:1px solid #d9dbe0;border-radius:6px;background:#fff;cursor:pointer;box-shadow:2px 2px 4px #adb0bb}
.isu-actions{margin:16px 0 6px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.isu-btn{display:inline-block;font:inherit;font-weight:bold;padding:10px 22px;border:0;border-radius:6px;background:#e9ecf5;color:#303545;cursor:pointer;box-shadow:3px 3px 6px #adb0bb;text-decoration:none}
.isu-btn-primary{background:#7dd}
.isu-btn[disabled]{opacity:.5;cursor:default}
.isu-feedback{min-height:1.6em;margin:8px 0;font-size:1.1rem}
.isu-feedback.ok{color:#1a7f37}.isu-feedback.err{color:#b32d2e}
.isu-report{text-align:right;margin-top:24px}
.isu-report a{display:inline-block;border:1px solid #d9dbe0;border-radius:6px;padding:6px 12px;color:#303545;text-decoration:none;font-size:.9rem}
.isu-modal{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:200;padding:16px}
.isu-modal[hidden]{display:none}
.isu-modal-box{background:#fff;border-radius:10px;padding:24px 28px;max-width:420px;width:100%;color:#303545}
.isu-plus{font-size:2.4rem;font-weight:bold;color:#4257c1;margin:8px 0 18px}
.isu-sections,.isu-tests{display:flex;flex-direction:column;gap:16px;max-width:800px;margin:12px auto}
.isu-section,.isu-test-card{display:block;position:relative;background:#fff;border:1px solid #d9dbe0;border-radius:6px;padding:12px 16px;text-align:left;color:#303545;text-decoration:none;box-shadow:3px 3px 6px #adb0bb;font-size:min(22px,4.5vw)}
.isu-section:hover,.isu-test-card:hover{color:#303545;background:#f6f7fb}
.isu-test-title{display:block;font-size:min(22px,4.5vw)}
.isu-test-rule{display:block;color:#757e9d;font-size:min(20px,3.8vw);margin-top:4px}
.isu-test-cups{position:absolute;right:12px;top:-12px;background:#fff;border:1px solid #d9dbe0;border-radius:6px;padding:0 8px;font-size:.95rem;color:#4257c1}
.isu-test-cups[hidden]{display:none}
.isu-draft{color:#b32d2e;font-size:.8em;font-style:normal}
.isu-section-title{font-size:min(26px,5vw);color:#303545;margin:8px 0 16px}
.isu-teacher-bar{text-align:center;margin:4px 0 12px}
.isu-tlink{background:none;border:0;padding:4px 8px;font:inherit;font-size:1rem;color:#0d6efd;text-decoration:underline;cursor:pointer}
/* 0.2.1: мгновенная проверка выбора */
.isu-opt.is-good{background:#e3f6e8!important;border-color:#1a7f37!important;box-shadow:0 0 0 3px #0dfd0e,3px 3px 6px #adb0bb!important;animation:none!important}
.isu-opt.is-bad{background:#fde8e8!important;border-color:#b32d2e!important;box-shadow:0 0 0 3px #f63248,3px 3px 6px #adb0bb!important;animation:isuShake .35s 1!important}
.isu-opt.is-wrong{background:#fdf1f1;color:#9a6b6b;border-color:#e8c4c4}
.isu-opt[disabled]{cursor:default}
@keyframes isuShake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}