/* Estudo usa a paleta editorial existente, não copia o painel do concorrente. */
.study-wrap [hidden] { display: none !important; }
.study-skip { position: absolute; top: -100px; left: 12px; z-index: 10; background: var(--surface); padding: 8px 12px; }
.study-skip:focus { top: 8px; }
.study-topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px max(24px, calc((100vw - 1280px)/2)); border-bottom: 1px solid var(--border); background: var(--surface); }
.study-logo { font-weight: 800; text-decoration: none; white-space: nowrap; }
.study-logo span { color: var(--brand-active); font-size: 11px; letter-spacing: .1em; }
.study-topbar nav { display: flex; flex-wrap: wrap; gap: 10px; }
.study-topbar nav a, .study-actions a, .study-actions button, .study-empty a { display: inline-block; border: 1px solid var(--border-strong); border-radius: 8px; padding: 8px 12px; background: var(--surface); color: var(--text-primary); font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; }
.study-topbar a:hover, .study-actions a:hover, .study-actions button:hover, .study-empty a:hover { background: var(--brand-softer); }
.study-wrap { max-width: 1328px; padding: 28px 24px 70px; margin: auto; }
.study-intro { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 24px; }
.study-intro h1 { font-size: clamp(28px, 4vw, 44px); line-height: 1.12; letter-spacing: -.04em; margin: 8px 0 10px; }
.study-intro p:not(.study-eyebrow) { max-width: 690px; color: var(--text-secondary); }
.study-eyebrow, .study-pane-head span { color: var(--brand-active); font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.study-totals { flex: 0 0 230px; border-left: 4px solid var(--brand); padding: 8px 16px; background: var(--surface); font-size: 13px; }
.study-totals strong { display: block; font-size: 24px; line-height: 1.3; }
.study-shell { display: grid; grid-template-columns: minmax(200px, 240px) minmax(220px, 270px) minmax(0, 1fr); align-items: start; gap: 12px; }
.study-shell > * { min-width: 0; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); padding: 18px; box-shadow: var(--shadow-xs); }
.study-pane-head { border-bottom: 1px solid var(--border); margin-bottom: 18px; padding-bottom: 12px; }
.study-pane-head h2 { font-size: 20px; line-height: 1.2; margin: 4px 0 0; overflow-wrap: anywhere; }
.study-search { grid-column: 1 / -1; }
.study-search form { display: grid; grid-template-columns: minmax(180px, 2fr) minmax(140px, 1fr) repeat(2, minmax(125px, 1fr)) auto; gap: 8px; align-items: end; }
.study-search label { font-size: 12px; font-weight: 700; }
.study-search :is(input, select, button) { width: 100%; min-height: 44px; border: 1px solid var(--border-strong); border-radius: 8px; background: white; color: var(--text-primary); padding: 8px; font: inherit; }
.study-search form button { background: var(--brand); color: white; cursor: pointer; font-weight: 700; }
.study-search-results { display: grid; gap: 6px; }
.study-search-results button { text-align: left; background: var(--surface-muted); color: var(--text-primary); cursor: pointer; }
.study-search-results button strong, .study-search-results button small { display: block; }
.study-search-results button small { color: var(--text-secondary); margin-top: 4px; }
.study-search-results button span { display: block; margin-top: 5px; overflow-wrap: anywhere; }
.study-transcript mark { background: #ffe49a; color: inherit; }
.study-library label { display: block; font-size: 12px; font-weight: 700; margin: 0 0 6px; }
.study-library input { width: 100%; min-height: 44px; border: 1px solid var(--border-strong); border-radius: 8px; background: white; padding: 8px 10px; font: inherit; }
.study-hint { color: var(--text-secondary); font-size: 12px; line-height: 1.5; margin: 8px 0 14px; }
.study-courses, #study-lessons { display: grid; gap: 6px; }
.study-courses button, #study-lessons button { display: block; width: 100%; min-height: 48px; padding: 10px 12px; border: 1px solid transparent; border-radius: 8px; background: transparent; color: var(--text-primary); text-align: left; font: inherit; cursor: pointer; overflow-wrap: anywhere; }
.study-courses button:hover, #study-lessons button:hover { background: var(--surface-muted); }
.study-courses button[aria-current="true"], #study-lessons button[aria-current="true"] { border-color: var(--brand); border-left-width: 4px; background: var(--brand-softer); }
.study-courses button strong, #study-lessons button strong { display: block; font-size: 13px; line-height: 1.35; }
.study-courses button small, #study-lessons button small { display: block; color: var(--text-secondary); font-size: 11px; line-height: 1.45; margin-top: 3px; }
#study-lessons button:disabled { opacity: .65; cursor: not-allowed; }
.study-reader .study-pane-head h2 { font-size: clamp(22px, 2.3vw, 30px); }
.study-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 14px 0; }
.study-actions button:disabled { opacity: .5; cursor: not-allowed; }
.study-actions #study-mark { border-color: var(--brand); background: var(--brand-softer); }
.study-section { margin-top: 24px; border-top: 1px solid var(--border); padding-top: 20px; }
.study-section h3 { font-size: 16px; margin: 0 0 10px; }
.study-text { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.7; }
.study-transcript { max-height: min(60vh, 650px); min-height: 180px; overflow: auto; border: 1px solid var(--border); border-radius: 8px; padding: 18px; background: white; white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.75; }
.study-transcript p + p { margin-top: 14px; }
:is(.study-notes, .study-cards, .study-concepts) h4 { margin: 12px 0 6px; font-size: 14px; }
:is(.study-notes, .study-cards, .study-concepts) label { display: block; margin: 12px 0; font-size: 12px; font-weight: 700; }
:is(.study-notes, .study-cards, .study-concepts) :is(input, textarea, select) { display: block; width: 100%; min-height: 44px; margin-top: 5px; padding: 10px; border: 1px solid var(--border-strong); border-radius: 8px; font: inherit; color: var(--text-primary); background: white; }
:is(.study-notes, .study-cards, .study-concepts) textarea { resize: vertical; overflow-wrap: anywhere; }
:is(.study-notes, .study-cards, .study-concepts) button { border: 1px solid var(--border-strong); border-radius: 8px; background: var(--surface); padding: 9px 12px; font: inherit; font-weight: 700; color: var(--text-primary); cursor: pointer; }
:is(.study-notes, .study-cards, .study-concepts) :is(#notes-save, #cards-save, #concepts-save) { background: var(--brand); color: white; }
:is(.study-notes, .study-cards, .study-concepts) button:hover { background: var(--brand-softer); }
:is(.study-notes, .study-cards, .study-concepts) :is(#notes-save, #cards-save, #concepts-save):hover { background: var(--brand-active); }
:is(.study-notes, .study-cards, .study-concepts) button:disabled { opacity: .5; cursor: wait; }
.notes-list { display: grid; gap: 10px; }
.notes-card, .cards-review article { border: 1px solid var(--border); border-radius: 8px; background: var(--surface-muted); padding: 12px; min-width: 0; overflow-wrap: anywhere; }
.notes-card blockquote, .cards-review blockquote { margin: 12px 0; border-left: 3px solid var(--brand); padding-left: 12px; white-space: pre-wrap; font-size: 13px; }
.notes-card small, .cards-review small { color: var(--text-secondary); }
#notes-status, #cards-status, #concepts-status { min-height: 1.5em; font-size: 13px; color: var(--text-secondary); }
.study-cards details { margin: 16px 0; }
:is(.study-cards, .study-concepts) summary { cursor: pointer; font-weight: 700; padding: 8px 0; }
.study-concepts legend { font-weight: 700; }
.study-cards #cards-summary { font-weight: 700; }
.cards-review .study-actions { margin-bottom: 0; }
.study-navigation { justify-content: space-between; }
.study-error { border: 1px solid var(--danger); border-radius: 8px; color: var(--danger); padding: 12px; margin-bottom: 16px; }
.study-empty { grid-column: 1 / -1; padding: 34px !important; text-align: center; }
.study-empty h2 { font-size: 22px; margin-bottom: 8px; }
.study-empty a { margin-top: 18px; }
.study-footnote { color: var(--text-secondary); max-width: 780px; font-size: 12px; margin: 22px 0 0; }
.study-wrap :is(a, button, input, select, textarea, summary, [tabindex="0"]):focus-visible, .study-topbar a:focus-visible { outline: 3px solid var(--brand-active); outline-offset: 3px; }
.study-concepts .notes-card:focus { outline: 3px solid var(--brand-active); outline-offset: 3px; }
@media (max-width: 1050px) { .study-shell { grid-template-columns: minmax(180px, 1fr) minmax(220px, 1.3fr); } .study-reader { grid-column: 1 / -1; } .study-search form { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 680px) { .study-wrap { padding: 20px 12px 50px; } .study-topbar { padding: 12px; flex-wrap: wrap; } .study-intro { display: block; } .study-totals { margin-top: 18px; } .study-shell { display: block; } .study-shell > * { margin-top: 10px; } .study-search form { display: grid; grid-template-columns: 1fr; } .study-transcript { max-height: 55vh; padding: 12px; } }
.study-quizzes h4 { margin: 14px 0 8px; }
.study-quizzes label, .study-shared label { display: block; margin: 10px 0; font-weight: 600; font-size: 13px; }
.study-quizzes :is(input:not([type=radio]), select, textarea), .study-shared input:not([type=radio]) { display: block; width: 100%; min-height: 44px; margin-top: 5px; border: 1px solid var(--border-strong); border-radius: 8px; padding: 9px; background: white; color: var(--text-primary); font: inherit; }
.study-quizzes textarea { resize: vertical; }
.study-quizzes fieldset, .study-shared fieldset { min-width: 0; border: 1px solid var(--border); border-radius: 8px; margin: 12px 0; padding: 12px; }
.study-quizzes legend, .study-shared legend { font-weight: 700; }
.study-quizzes button, .study-shared button { border: 1px solid var(--border-strong); border-radius: 8px; background: var(--surface); color: var(--text-primary); padding: 9px 12px; font: inherit; cursor: pointer; }
.study-quizzes button:disabled, .study-shared button:disabled { opacity: .5; }
.study-quizzes #quizzes-save, .study-shared button[type=submit] { background: var(--brand); color: white; }
.study-quizzes #quizzes-status input { max-width: 100%; font-size: 12px; }
.study-shared { max-width: 760px; }
.study-shared #quiz-result blockquote { border-left: 3px solid var(--brand); padding-left: 12px; overflow-wrap: anywhere; }