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720px){.vocab-metrics{width:100%;justify-content:flex-start}.card-actions,.preset-toolbar{align-items:stretch}.flashcard{padding:28px}}.modal-panel{background:var(--surface);border-radius:16px;border:1px solid var(--border);padding:24px;width:min(680px,100%);max-height:min(90vh,720px);overflow:auto;box-shadow:0 16px 48px #0006}.rename-modal{position:relative;display:grid;gap:clamp(16px,2.5vh,24px);background:radial-gradient(circle at top right,rgba(122,162,255,.16),transparent 58%),radial-gradient(circle at bottom left,rgba(110,231,183,.12),transparent 62%),var(--surface);border:1px solid rgba(122,162,255,.28);padding:clamp(22px,3vw,34px);overflow:visible}.rename-modal .modal-close{position:absolute;top:18px;right:18px;width:36px;height:36px;border-radius:999px;border:1px solid rgba(122,162,255,.3);background:#0c143073;color:var(--muted);font-size:22px;font-weight:600;line-height:1;cursor:pointer;display:grid;place-items:center;transition:transform .2s ease,box-shadow .2s ease,color .2s ease}.rename-modal .modal-close:hover{transform:translateY(-2px);box-shadow:0 18px 40px #070e2273;color:var(--accent)}.rename-modal .modal-header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.rename-modal .modal-kicker{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:6px}.rename-modal h3{margin:0;font-size:clamp(22px,3vw,26px);font-family:var(--font-heading)}.rename-modal .modal-subtitle{font-size:13px;color:var(--muted);background:#0c143073;border-radius:12px;padding:8px 12px;border:1px solid rgba(122,162,255,.22);align-self:center}.rename-form{display:grid;gap:clamp(14px,2vh,20px)}.rename-field{display:grid;gap:8px;font-weight:600;color:var(--muted)}.rename-field input{width:100%;border-radius:14px;border:1px solid rgba(122,162,255,.3);background:var(--control-bg);padding:14px 16px;font-size:16px;font-weight:600;color:var(--text);transition:border-color .2s ease,box-shadow .2s 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.suggestion-label{font-size:13px;color:var(--muted);font-weight:600}.rename-suggestions .suggestion-grid{display:flex;flex-wrap:wrap;gap:10px}.suggestion-chip{border:1px solid rgba(122,162,255,.28);background:#0c143073;color:var(--text);border-radius:999px;padding:8px 16px;font-weight:600;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background .18s ease}.suggestion-chip:hover{transform:translateY(-1px);box-shadow:0 14px 28px #070e2259;background:#7aa2ff38}.rename-hint{font-size:13px;font-weight:600;padding:10px 14px;border-radius:12px;border:1px solid rgba(122,162,255,.18);background:#0c143073;color:var(--muted)}.rename-hint.success{border-color:#6ee7b747;background:#104e3c73;color:#6ee7b7}.rename-hint.error{border-color:#f8717159;background:#4c16268c;color:#fca5a5}.rename-actions{display:flex;justify-content:flex-end;gap:12px;flex-wrap:wrap}.rename-modal .btn[disabled],.rename-modal 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.divider{width:1px;background:var(--border);align-self:stretch}.modal-panel .explanation .distinction{border-collapse:collapse;width:100%}.modal-panel .explanation .distinction td{border:1px solid var(--border);padding:6px;vertical-align:top}.modal-panel .explanation .distinction td div{padding:2px 0}.modal-panel .explanation .three-d-scene{perspective:900px;transform-style:preserve-3d;display:grid;gap:16px;padding:8px 0 12px 16px}.modal-panel .explanation .three-d-plane{background:var(--surface-2);border-radius:16px;padding:12px;box-shadow:0 12px 28px #00000059;border:1px solid var(--border);transform-origin:bottom left}.modal-panel .explanation .plane-1{transform:rotateY(10deg) rotateX(10deg) translateZ(0)}.modal-panel .explanation .plane-2{transform:rotateY(12deg) rotateX(10deg) translateZ(-60px)}.modal-panel .explanation .plane-3{transform:rotateY(14deg) rotateX(10deg) translateZ(-120px)}.modal-panel .explanation .plane-4{transform:rotateY(16deg) rotateX(10deg) translateZ(-180px)}.modal-panel .explanation .plane-5{transform:rotateY(18deg) rotateX(10deg) translateZ(-240px)}.modal-panel .explanation .plane-6{transform:rotateY(20deg) rotateX(10deg) translateZ(-300px)}.modal-panel .explanation .plane-7{transform:rotateY(22deg) rotateX(10deg) translateZ(-360px)}.modal-panel .explanation .plane-8{transform:rotateY(24deg) rotateX(10deg) translateZ(-420px)}.modal-panel .explanation .plane-9{transform:rotateY(26deg) rotateX(10deg) translateZ(-480px)}.modal-panel .explanation .plane-10{transform:rotateY(26deg) rotateX(10deg) translateZ(-540px)}.modal-panel .explanation .plane-11{transform:rotateY(26deg) rotateX(10deg) translateZ(-600px)}.modal-panel .explanation .four-d-scene{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-start}.modal-panel .explanation .four-d-scene>div{display:grid;gap:8px;min-width:220px}.chip.selectable{display:inline-flex;align-items:center;gap:8px;cursor:pointer;background:#7aa2ff14;color:inherit;transition:background .16s 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