.study-tools-dialog {width:min(1100px,94vw);max-width:none;height:90dvh;max-height:94dvh;box-sizing:border-box;border:1px solid var(--border);border-radius:20px;padding:24px;background:var(--surface);color:var(--text);overflow:auto;}
.study-tools-dialog::backdrop {background:#000b;backdrop-filter:blur(5px);}
.study-tools-dialog [hidden] {display:none!important;}
.study-tools-header {display:flex;align-items:center;justify-content:space-between;gap:16px;}
.study-tools-header h2 {font-size:20px;overflow-wrap:anywhere;}
.study-tools-header .btn {flex-shrink:0;}
.study-tools-status {font-size:13px;line-height:1.8;color:var(--text-muted);margin:14px 0;}
.study-tools-tabs,.study-card-filters,.study-card-navigation,.study-card-ratings,.study-map-controls {display:flex;gap:8px;flex-wrap:wrap;margin:14px 0;align-items:center;}
.study-tools-dialog .btn {min-height:44px;}
.study-tools-tabs [aria-pressed="true"],.study-card-filters [aria-pressed="true"] {background:var(--text);color:var(--surface);}
.study-map-controls span {font-size:12px;color:var(--text-muted);}
.study-map-viewport {height:55dvh;min-height:300px;overflow:auto;border:1px solid var(--border);border-radius:16px;direction:ltr;background:var(--surface2);cursor:grab;}
.study-map-canvas {min-width:100%;min-height:100%;position:relative;}
.study-map-tree {position:absolute;left:0;top:0;transform-origin:top left;width:max-content;padding:24px;direction:rtl;}
.study-map-branch {margin:10px 0;max-width:340px;}
.study-map-children {border-right:1px solid var(--border-bright);padding-right:22px;margin-right:16px;}
.study-map-tree > .study-map-branch {max-width:none;}
.study-map-tree > .study-map-branch > details > .study-map-node {max-width:300px;margin-left:auto;}
.study-map-tree > .study-map-branch > details > .study-map-children {display:flex;align-items:flex-start;gap:20px;border-top:1px solid var(--border-bright);border-right:0;margin:20px 0 0;padding:16px 0 0;}
.study-map-tree > .study-map-branch > details > .study-map-detail {max-width:400px;}
.study-map-node {padding:12px 16px;min-width:180px;border:1px solid var(--border-bright);border-radius:12px;background:var(--surface);font-weight:700;cursor:pointer;overflow-wrap:anywhere;}
.study-map-detail {padding:12px;line-height:1.9;font-size:14px;overflow-wrap:anywhere;}
.study-map-detail small {display:block;color:var(--text-muted);}
.study-map-detail .btn {margin-top:8px;}
.study-cards-panel {max-width:700px;margin:auto;text-align:center;}
.study-card-filters,.study-card-navigation,.study-card-ratings {justify-content:center;}
.study-flashcard {display:block;width:100%;min-height:240px;padding:30px;border:1px solid var(--border-bright);border-radius:20px;background:var(--surface2);color:var(--text);font:inherit;font-size:22px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere;cursor:pointer;animation:studyCardReveal .2s ease;}
.study-flashcard[aria-pressed="true"] {background:var(--surface3);font-size:18px;}
.study-tools-dialog :focus-visible {outline:2px solid var(--accent);outline-offset:3px;}
@keyframes studyCardReveal {from{opacity:.4;transform:translateY(5px);}to{opacity:1;transform:none;}}
@media(max-width:700px) {.study-tools-dialog {width:100vw;height:100dvh;max-height:100dvh;margin:0;border-radius:0;padding:18px 14px calc(18px + env(safe-area-inset-bottom));}.study-tools-header h2 {font-size:16px;}.study-map-viewport {height:60dvh;}.study-flashcard {font-size:19px;padding:20px;}.study-map-tree {padding:16px;}.study-map-branch {max-width:280px;}.study-map-node {min-width:150px;}}
@media(prefers-reduced-motion:reduce) {.study-flashcard {animation:none;}}