/* Accessible component layer. Loaded after the legacy stylesheets; colours come only from tokens.css. */

/* ---------- Base (also styles the legacy, previously unstyled pages) ---------- */
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font-size:15px;line-height:1.6}
a{color:var(--accent-text)}
a:hover{color:var(--accent-strong)}
h1,h2,h3{color:var(--ink);line-height:1.3}
input:not([type=checkbox]):not([type=radio]):not([type=hidden]),select,textarea{
  background:var(--surface);color:var(--ink);border:1px solid var(--line-strong);border-radius:8px;
  padding:9px 11px;font:inherit;font-size:15px;min-height:42px;max-width:100%}
input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}
input[type=checkbox],input[type=radio]{accent-color:var(--accent);width:18px;height:18px}
button,.btn{font:inherit}
table{border-collapse:collapse}
th,td{border-bottom:1px solid var(--line);padding:8px 10px;text-align:left}
th{color:var(--ink-2);font-weight:700}

/* ---------- Focus: always visible, 3:1 against every surface ---------- */
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:6px}
.vault-core a:focus-visible,.vault-core button:focus-visible,.vault-core input:focus-visible,.vault-core select:focus-visible,.vault-core summary:focus-visible{outline:3px solid var(--focus);outline-offset:2px}

/* ---------- Buttons ---------- */
.btn,button[type=submit],.vault-core .btn,.vault-core button[type=submit]{background:var(--accent);color:var(--on-accent);border:1px solid var(--accent)}
.btn:hover,button[type=submit]:hover,.vault-core .btn:hover,.vault-core button[type=submit]:hover{background:var(--accent-strong);border-color:var(--accent-strong);color:var(--on-accent);text-decoration:none}
.btn.secondary,.vault-core .btn.secondary{background:var(--surface);color:var(--accent-text);border:1px solid var(--line-strong)}
.btn.secondary:hover,.vault-core .btn.secondary:hover{background:var(--accent-soft);color:var(--accent-text)}
button:disabled,.btn[aria-disabled=true]{cursor:not-allowed;opacity:.55}

/* ---------- Text roles ---------- */
.muted,.vault-core .muted{color:var(--muted)}
.eyebrow,.vault-core .eyebrow{color:var(--accent-text);font-size:12px;letter-spacing:.08em}
.badge,.vault-core .badge{background:var(--accent-soft);color:var(--accent-text);font-size:12px;font-weight:700}
.notice,.vault-core .notice{background:var(--warn-soft);color:var(--ink);border:1px solid var(--warn)}

/* ---------- Pills: colour + words, never colour alone ---------- */
.result-pill,.vault-core .result-pill{background:var(--warn-soft);color:var(--warn-text);font-size:12px}
.result-correct,.vault-core .result-correct{background:var(--ok-soft);color:var(--ok-text)}

/* ---------- Answer options (practice + institute tests) ---------- */
.answer-choice,.question-detail .answer-choice,.test-option{border:1px solid var(--line-strong);background:var(--surface);color:var(--ink)}
.answer-choice:hover,.test-option:hover{border-color:var(--accent)}
.answer-choice:has(input:checked),.question-detail .answer-choice:has(input:checked),.test-option:has(input:checked){
  border:2px solid var(--accent);background:var(--accent-soft);color:var(--ink)}
.question-detail .answer-choice b{color:var(--accent-text)}

/* ---------- Exam identity (each exam keeps its own accessible hue) ---------- */
.vault-exam,.exam-jee-main{--exam:var(--exam-jee-main);--exam-bg:var(--exam-jee-main-soft)}
.exam-neet{--exam:var(--exam-neet);--exam-bg:var(--exam-neet-soft)}
.exam-jee-advanced{--exam:var(--exam-jee-advanced);--exam-bg:var(--exam-jee-advanced-soft)}
.exam-category,.exam-monogram,.vault-core .exam-category,.vault-dark .exam-category,.vault-dark .exam-monogram{color:var(--exam);background:var(--exam-bg)}
.exam-footer span,.vault-core .exam-footer span{color:var(--exam)}
.exam-footer strong,.vault-core .exam-footer strong{color:var(--ink)}

/* ---------- Card links keep body colours (they are <a> elements) ---------- */
.vault-core a.vault-exam,.vault-core a.subject-card,.vault-core a.tool-card,.vault-core .vault-logo,a.vault-exam,a.subject-card,a.tool-card,.vault-logo{color:var(--ink)}
.vault-core .theme-toggle,.vault-core .vault-signout,.theme-toggle,.vault-signout{color:var(--ink-2)}
.hero-pill{color:var(--on-accent)}
.exam-banner,.exam-banner p,.exam-banner h1,.exam-banner h2{color:var(--on-accent)}
.exam-banner .badge{background:#ffffff26;color:var(--on-accent)}

/* ---------- Navigation ---------- */
.vault-nav a{color:var(--ink-2);background:var(--surface-2);border-color:var(--line)}
.vault-nav a[aria-current=page]{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.vault-bottomnav a{font-size:12px;color:var(--muted)}
.vault-bottomnav a[aria-current=page]{color:var(--accent-text)}
.chapter-links a[aria-current=true]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-text)}
.subject-links a[aria-current=true]{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}

/* ---------- Cards and panels keep visible edges in dark mode ---------- */
.panel,.vault-stat,.vault-exam,.card,.stat{border-color:var(--line)}

/* ---------- Motion ---------- */
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}

/* ---------- Header details ---------- */
.logo-accent,.vault-core .logo-accent{color:var(--accent-text)}
.vault-core select,.vault-core .practice-filters select,.vault-core .practice-filters input{font-size:14px}

/* ---------- Question images: white mat so black-line diagrams stay legible in dark mode ---------- */
.question-figures{display:flex;flex-wrap:wrap;gap:14px;margin:16px 0}
.question-figures figure{margin:0;max-width:100%}
.question-figures img{display:block;max-width:100%;max-height:440px;height:auto;background:#fff;padding:8px;border:1px solid var(--line-strong);border-radius:10px}
.question-figures figcaption{font-size:13px;color:var(--muted);margin-top:6px}

/* ---------- Accessibility helpers ---------- */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:absolute;left:12px;top:-60px;z-index:100;padding:10px 16px;border-radius:8px;background:var(--accent);color:var(--on-accent);font-weight:700;text-decoration:none}
.skip-link:focus{top:12px;color:var(--on-accent)}
main:focus{outline:none}
@media (pointer:coarse){.exam-palette .chip .chip-shape{height:44px}.result-chip{min-width:44px;height:44px}.exam-zoom button,.exam-icon-btn{min-height:44px}}
.vault-admin-link{font-size:13px;font-weight:700;padding:6px 12px;border-radius:8px;border:1px solid var(--line-strong);color:var(--ink);text-decoration:none}
.vault-admin-link:hover{background:var(--accent-soft);color:var(--accent-text);text-decoration:none}