/* V16: alternativas visuales, biblioteca administrable y experiencia móvil */
.alternative-content{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px;align-items:center;min-width:0}
.alternative-content>input[type="text"],.alternative-content>input:not([type]){grid-column:1/-1;margin:0}
.alternative-image-upload{display:inline-flex;align-items:center;justify-content:center;gap:7px;width:max-content;margin:0;padding:8px 11px;border:1px solid #d9ddf6;border-radius:9px;background:#f5f4ff;color:var(--primary);font-size:11px;font-weight:800;cursor:pointer}
.alternative-image-upload:hover{border-color:var(--primary);background:#eeedff}
.alternative-image-upload input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.alternative-image-current{grid-column:1/-1;display:flex;align-items:center;gap:12px;padding:9px;border:1px solid var(--line);border-radius:11px;background:#f8fafc}
.alternative-image-current img{display:block;width:112px;height:76px;object-fit:contain;border-radius:8px;background:#fff}
.alternative-image-current .check{font-size:11px}

/* Editor de preguntas compacto */
.question-form-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px 14px;align-items:start}
.question-form-grid .question-statement-field{grid-column:1/3;grid-row:1/3}
.question-statement-field textarea{min-height:145px}
.question-form-grid .question-type-field{grid-column:3;grid-row:1}.question-form-grid .question-difficulty-field{grid-column:4;grid-row:1}.question-form-grid .question-topic-field{grid-column:3;grid-row:2}.question-form-grid .question-points-field{grid-column:4;grid-row:2}
.question-form-grid .question-image-source{grid-column:1/3;min-height:82px;padding:12px 14px}
.question-form-grid .library-source-preview,.question-form-grid .manual-image-fields{grid-column:3/5;min-height:82px}
.question-form-grid .library-source-preview{padding:10px 12px}
.question-form-grid .library-source-preview img{width:104px;max-height:72px}
.question-form-grid .manual-image-fields{padding:10px 12px;border:1px solid var(--line);border-radius:13px;background:#fafbfe}
.question-form-grid .manual-image-fields>label input{margin-top:5px;padding:8px}
.question-form-grid .question-current-image{grid-template-columns:118px minmax(0,1fr);align-items:center;padding:8px}
.question-form-grid .question-current-image .field-help{grid-column:1/-1;margin:0}
.question-form-grid .question-current-image .question-image{width:118px;max-height:82px;margin:0}
.question-form-grid .alternatives-editor,.question-form-grid .form-actions{grid-column:1/-1}
.question-form-grid .question-explanation-field{grid-column:1/3}
.question-form-grid .question-explanation-image-field{grid-column:3/5}
.question-form-grid .question-explanation-field textarea{min-height:105px}
.question-editor-dialog>.panel{padding:20px}.question-editor-dialog .panel-head{margin-bottom:13px}
.question-dialog-navigation{display:flex;align-items:center;justify-content:flex-end;gap:8px}.question-correlative{display:inline-grid;place-items:center;min-width:34px;height:34px;padding:0 8px;border-radius:10px;background:#eef0ff;color:var(--primary)}

/* Vista administrativa de examen completo */
.exam-overview-tools{position:sticky;top:8px;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px;padding:11px 14px;border:1px solid var(--line);border-radius:13px;background:rgba(255,255,255,.94);box-shadow:0 8px 24px rgba(20,28,48,.07);backdrop-filter:blur(12px)}.exam-overview-tools>label{display:grid;grid-template-columns:auto minmax(220px,420px);align-items:center;gap:10px;flex:1}.exam-overview-tools input{padding:9px 11px}
.exam-overview-list{display:grid;gap:14px;counter-reset:overview}.exam-overview-card{display:grid;grid-template-columns:58px minmax(0,1fr);gap:14px;padding:18px;border:1px solid var(--line);border-radius:15px;background:#fff;break-inside:avoid}.exam-overview-number{display:grid;place-items:center;align-self:start;width:48px;height:48px;border-radius:13px;background:linear-gradient(145deg,#eef0ff,#f8f8ff);color:var(--primary);font-weight:800;font-size:16px}.exam-overview-body{min-width:0}.exam-overview-meta{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:9px;color:var(--muted);font-size:11px}.exam-overview-statement{font-weight:700;line-height:1.55}.exam-overview-image{display:block;max-width:min(420px,100%);max-height:260px;margin:12px 0;border-radius:12px;object-fit:contain}.exam-overview-alternatives{display:grid;gap:7px;margin:13px 0 0;padding:0;list-style:none}.exam-overview-alternative{display:grid;grid-template-columns:30px minmax(0,1fr);gap:9px;align-items:start;padding:9px 11px;border:1px solid #e5e7ef;border-radius:10px;background:#fafbfe}.exam-overview-alternative.correct{border-color:#a7e7c7;background:#f0fbf6}.exam-overview-letter{display:grid;place-items:center;width:27px;height:27px;border-radius:8px;background:#e9ebf4;font-weight:800;font-size:12px}.exam-overview-alternative.correct .exam-overview-letter{background:#159663;color:#fff}.exam-overview-alternative img{display:block;max-width:min(300px,100%);max-height:190px;margin-top:7px;border-radius:9px;object-fit:contain}.exam-overview-empty{text-align:center;padding:50px 20px;color:var(--muted)}

.option-content{display:grid;gap:8px;min-width:0;flex:1}
.alternative-answer-image{display:block;width:auto;max-width:min(100%,360px);max-height:260px;object-fit:contain;border-radius:11px;border:1px solid #e4e7ee;background:#fff}
.option.option-visual{align-items:flex-start}
.option>span+.alternative-answer-image{margin-top:4px}

.library-bulk-toolbar{position:sticky;top:12px;z-index:4;display:flex;align-items:center;gap:13px;flex-wrap:wrap;margin-bottom:16px;padding:12px 14px;border:1px solid #dfe2f6;border-radius:12px;background:rgba(255,255,255,.96);box-shadow:0 8px 24px rgba(30,38,61,.08);backdrop-filter:blur(10px)}
.library-bulk-toolbar .check{font-weight:800;color:var(--ink)}
.library-bulk-toolbar>span{margin-right:auto;color:var(--muted);font-size:11px;font-weight:700}
.library-card{position:relative;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease}
.library-card.is-selected{border-color:var(--primary);box-shadow:0 0 0 3px rgba(91,92,226,.11),0 12px 28px rgba(26,34,55,.08);transform:translateY(-1px)}
.library-card-select{position:absolute;z-index:3;top:22px;left:22px;margin:0;cursor:pointer}
.library-card-select input{position:absolute;opacity:0}
.library-card-select span{display:grid;place-items:center;width:27px;height:27px;border:2px solid #fff;border-radius:8px;background:rgba(17,26,46,.72);color:transparent;box-shadow:0 4px 12px rgba(17,26,46,.25);backdrop-filter:blur(7px)}
.library-card-select input:checked+span{background:var(--primary);color:#fff}
.library-rename-form{display:grid!important;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:8px;margin:5px 0 10px!important;padding-top:10px;border-top:1px solid var(--line)}
.library-rename-form label{min-width:0}.library-rename-form input{min-width:0;font-size:11px;padding:9px}

.auth-shell{background:radial-gradient(circle at 82% 10%,rgba(91,92,226,.1),transparent 25%),#f8f9fd}
.auth-visual{isolation:isolate;align-items:flex-end;justify-content:flex-start;background:radial-gradient(circle at 72% 20%,rgba(139,92,246,.64),transparent 25%),radial-gradient(circle at 18% 78%,rgba(50,112,238,.36),transparent 30%),linear-gradient(145deg,#0a1327 0%,#202760 56%,#5632a5 100%)}
.auth-visual.register{background:radial-gradient(circle at 73% 18%,rgba(52,211,153,.5),transparent 25%),radial-gradient(circle at 15% 78%,rgba(91,92,226,.42),transparent 30%),linear-gradient(145deg,#091526 0%,#153d4e 56%,#17675d 100%)}
.auth-visual:before{content:"";position:absolute;z-index:1;right:clamp(35px,7vw,125px);top:clamp(45px,8vh,100px);width:clamp(185px,23vw,330px);aspect-ratio:1;background:url('../img/mascota-examina-v11.png') center/contain no-repeat;filter:drop-shadow(0 26px 38px rgba(4,9,22,.42));transform:rotate(2deg)}
.auth-visual:after{z-index:0}.auth-copy{z-index:2;text-shadow:0 3px 16px rgba(4,9,22,.3)}
.auth-panel{background:radial-gradient(circle at 100% 0,rgba(91,92,226,.08),transparent 32%)}
.auth-card{padding:30px;border:1px solid rgba(223,226,238,.86);border-radius:20px;background:rgba(255,255,255,.9);box-shadow:0 24px 65px rgba(20,28,48,.11);backdrop-filter:blur(16px)}

@media(max-width:1050px){
 .auth-shell{display:grid;grid-template-columns:1fr;align-content:start;min-height:100dvh}
 .auth-visual,.auth-visual.register{display:flex;min-height:205px;padding:28px clamp(24px,7vw,64px);align-items:center;overflow:hidden}
 .auth-visual:before{right:clamp(12px,8vw,80px);top:14px;width:170px;opacity:.96}
 .auth-copy{max-width:58%}.auth-copy h1{font-size:clamp(30px,5vw,44px);margin:9px 0 12px}.auth-copy p{font-size:14px;margin-bottom:0}.trust{margin-top:16px}
 .auth-panel{position:relative;z-index:3;padding:0 20px 42px;margin-top:-24px;place-items:start center;background:transparent}.auth-card{width:min(440px,100%)}
 .auth-logo>span{display:none}.auth-logo{justify-content:center;margin-bottom:18px;font-size:17px}
}
@media(max-width:760px){
 .app{padding:67px 14px 36px}.mobile-menu-button{left:12px;top:12px;width:41px;height:41px;border-radius:11px;font-size:21px}
 .top{gap:10px;margin-bottom:17px}.top h1{font-size:23px;line-height:1.15;margin:3px 0 3px}.top p{font-size:12px;line-height:1.4}.eyebrow{font-size:9px}
 .panel{padding:17px;margin-bottom:15px;border-radius:13px}.panel-head{gap:10px;margin-bottom:14px}.panel-head h2{font-size:16px}
 .catalog-hero{margin-bottom:14px}.catalog-hero h1{font-size:27px;margin:3px 0 5px}.catalog-hero p{font-size:12px}.catalog-breadcrumbs{margin-bottom:14px}
 .exam-sticky{top:8px;padding:10px 12px;margin-bottom:13px;border-radius:11px}.exam-sticky strong{font-size:12px}.timer{font-size:15px}
 .question-form-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.question-form-grid .question-statement-field{grid-column:1/-1;grid-row:auto}.question-form-grid .question-type-field,.question-form-grid .question-difficulty-field,.question-form-grid .question-topic-field,.question-form-grid .question-points-field{grid-column:auto;grid-row:auto}.question-form-grid .question-image-source,.question-form-grid .library-source-preview,.question-form-grid .manual-image-fields,.question-form-grid .question-explanation-field,.question-form-grid .question-explanation-image-field{grid-column:1/-1}.question-statement-field textarea{min-height:120px}
 .alternative-content{grid-template-columns:1fr}.alternative-image-current{align-items:flex-start;flex-direction:column}.alternative-image-current img{width:100%;height:150px}.library-dropzone{padding:20px 13px}.library-dropzone>span{max-width:100%;line-height:1.5;overflow-wrap:anywhere}
 .alternative-answer-image{width:100%;max-width:100%;max-height:250px}.library-bulk-toolbar{top:7px;gap:9px;padding:10px}.library-bulk-toolbar>span{margin-right:0;flex:1}.library-bulk-toolbar .btn{width:100%}.library-rename-form{grid-template-columns:1fr}.library-rename-form .btn{width:100%}
}
@media(min-width:601px) and (max-width:900px){
 .auth-visual,.auth-visual.register{min-height:180px;padding-block:22px}
 .auth-visual:before{top:8px;width:145px}
 .auth-copy{max-width:64%}.auth-copy h1{font-size:34px;margin:0}.auth-copy p,.auth-copy .trust{display:none}
}
@media(max-width:600px){
 .auth-shell{background:linear-gradient(180deg,#151d47 0 150px,#f5f7fb 150px 100%)}
 .auth-visual,.auth-visual.register{min-height:150px;padding:18px 17px 28px;align-items:flex-end;border-radius:0 0 26px 26px}
 .auth-visual:before{right:9px;top:8px;width:116px}.auth-copy{max-width:68%}.auth-copy .eyebrow{display:none}.auth-copy h1{font-size:24px;line-height:1.05;margin:0}.auth-copy p,.auth-copy .trust{display:none}
 .auth-panel{padding:0 0 22px;margin-top:-19px}.auth-card{width:100%;min-height:calc(100dvh - 131px);padding:25px 24px 28px;border:0;border-radius:27px 27px 0 0;background:#fff;box-shadow:0 -12px 34px rgba(16,24,55,.1);backdrop-filter:none}.auth-logo{justify-content:flex-start;margin:0 0 15px;font-size:16px;color:var(--primary)}.auth-card h2{font-size:25px;margin-bottom:4px}.auth-card>p{margin-bottom:14px}.google-btn{margin:15px 0;padding:12px}.or{margin:14px 0}.auth-card label{margin-bottom:11px}.auth-card input{padding:11px 12px}.auth-switch{margin-top:19px!important}.auth-legal{margin-top:14px!important}
 .question-form-grid{grid-template-columns:1fr}.question-form-grid .question-type-field,.question-form-grid .question-difficulty-field,.question-form-grid .question-topic-field,.question-form-grid .question-points-field,.question-form-grid .question-statement-field,.question-form-grid .question-image-source,.question-form-grid .library-source-preview,.question-form-grid .manual-image-fields,.question-form-grid .question-explanation-field,.question-form-grid .question-explanation-image-field{grid-column:1;grid-row:auto}.question-editor-dialog>.panel{padding:15px}.question-editor-dialog .panel-head{margin-bottom:10px}.question-dialog-navigation{width:100%;justify-content:space-between}.question-dialog-navigation .dialog-close{margin-left:auto}.exam-overview-tools{align-items:stretch;flex-direction:column}.exam-overview-tools>label{grid-template-columns:1fr;gap:6px}.exam-overview-tools .actions{width:100%}.exam-overview-tools .btn{flex:1}.exam-overview-card{grid-template-columns:1fr;padding:14px}.exam-overview-number{width:auto;height:34px;justify-self:start;padding:0 12px}
}

@media print{
 .sidebar,.top .actions,.exam-overview-tools,.support-chat-shell{display:none!important}.app{margin:0!important;padding:0!important}.top{padding:0 0 14px!important}.panel{border:0!important;box-shadow:none!important;padding:0!important}.exam-overview-list{gap:10px}.exam-overview-card{padding:12px;border-color:#bbb}.exam-overview-alternative{padding:7px;background:#fff!important}
}