/* ==========================================================
   extras.css : नए sections (Notes, PYQ, Mixed Practice) का design
   पुराने style.css के रंग (:root variables) ही इस्तेमाल होते हैं,
   इसलिए पुरानी website का रूप नहीं बदलता।
   सारे class नाम "x-", "nt-", "pq-", "px-" से शुरू होते हैं।
   ========================================================== */

/* ---------- सामान्य ---------- */
.x-new { color: var(--cyan); border-color: rgba(34, 211, 238, 0.55); background: rgba(34, 211, 238, 0.1); }
.x-hub-card { display: flex; flex-direction: column; gap: 6px; width: 100%; text-align: left; background: var(--surface); border: 1px solid var(--line); border-left: 5px solid var(--accent, var(--blue)); border-radius: var(--radius); padding: 14px; }
.x-hub-card strong { font-size: 1.1rem; }
.x-hub-card .x-hub-top { display: flex; align-items: center; gap: 12px; }
.x-hub-ico { font-size: 1.8rem; width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; background: color-mix(in srgb, var(--accent, var(--blue)) 20%, transparent); flex: none; }
.x-meta { color: var(--muted); font-size: 0.84rem; }
.x-search { width: 100%; min-height: 44px; padding: 8px 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface); color: var(--text); font: inherit; }
.x-search:focus { outline: 3px solid var(--cyan); outline-offset: 1px; }
.x-list { display: flex; flex-direction: column; gap: 10px; }
.x-row { display: flex; align-items: center; gap: 12px; width: 100%; text-align: left; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.x-row.off { opacity: 0.78; }
.x-row-no { width: 40px; height: 40px; border-radius: 12px; flex: none; display: grid; place-items: center; font-weight: 800; background: linear-gradient(135deg, var(--blue), var(--purple)); }
.x-row-main { display: flex; flex-direction: column; gap: 4px; min-width: 0; flex: 1; }
.x-row-main strong { overflow-wrap: anywhere; }
.x-row-end { color: var(--muted); font-size: 1.3rem; flex: none; }
.x-note { font-size: 0.86rem; color: var(--muted); }
.x-check-out { display: flex; flex-direction: column; gap: 6px; font-size: 0.86rem; }
.x-check-out .ln { padding: 6px 10px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface-2); overflow-wrap: anywhere; }
.x-check-out .ln.ok { border-color: rgba(52, 211, 153, 0.5); }
.x-check-out .ln.bad { border-color: rgba(251, 113, 133, 0.55); }
.x-check-out .ln.warn { border-color: rgba(245, 196, 81, 0.55); }

/* ---------- Notes : Student Notebook ---------- */
.nt-head { background: linear-gradient(135deg, rgba(79, 140, 255, 0.16), rgba(139, 92, 246, 0.12)); }
.nt-head h2 { font-size: 1.15rem; margin: 6px 0 2px; }
.nt-sec { display: flex; flex-direction: column; gap: 10px; }
.nt-sheet {
  position: relative; border-radius: 14px; padding: 14px 14px 14px 22px;
  background:
    linear-gradient(90deg, transparent 15px, rgba(251, 113, 133, 0.55) 15px, rgba(251, 113, 133, 0.55) 16px, transparent 16px),
    repeating-linear-gradient(to bottom, transparent 0, transparent 30px, rgba(147, 163, 209, 0.13) 30px, rgba(147, 163, 209, 0.13) 31px),
    var(--surface);
  border: 1px solid var(--line);
}
.nt-sheet h3 { font-size: 1.06rem; margin-bottom: 6px; color: var(--gold); overflow-wrap: anywhere; }
.nt-sheet p { font-size: 1.03rem; line-height: 1.85; overflow-wrap: anywhere; margin: 0 0 8px; }
.nt-sheet ul { margin: 4px 0 4px; padding-left: 20px; }
.nt-sheet li { font-size: 1.03rem; line-height: 1.8; overflow-wrap: anywhere; margin-bottom: 4px; }
.nt-q { font-weight: 700; color: var(--cyan); }
.nt-a { color: var(--text); }
.nt-term { font-weight: 800; color: var(--green); }
.nt-formula { font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif; font-size: 1.2rem; background: var(--surface-2); border: 1px dashed var(--line); border-radius: 10px; padding: 10px 12px; margin: 6px 0; overflow-x: auto; white-space: pre-wrap; overflow-wrap: anywhere; }
.nt-media { max-width: 100%; height: auto; border-radius: 10px; background: #fff; display: block; margin: 8px auto; }
.nt-embed { width: 100%; border: 1px solid var(--line); border-radius: 12px; background: #fff; display: block; margin: 8px 0; }
.nt-cap { color: var(--muted); font-size: 0.86rem; text-align: center; }
.nt-item[hidden], .nt-sec[hidden] { display: none; }
/* Theory/Derivation के Point के ठीक नीचे लगा Diagram */
.nt-inline-diagram { margin: 10px 0 4px; }
.nt-inline-diagram .nt-media { margin: 4px auto; }
/* Step-by-Step बदलता Diagram — बगल-बगल Scroll होने वाली पट्टी */
.nt-step-diagrams { display: flex; gap: 10px; overflow-x: auto; margin: 10px 0 4px; padding-bottom: 4px; -webkit-overflow-scrolling: touch; }
.nt-step { flex: 0 0 auto; width: 78%; max-width: 260px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; padding: 8px; scroll-snap-align: start; }
.nt-step-diagrams { scroll-snap-type: x proximity; }
.nt-step .nt-media { margin: 4px auto; }
.nt-step-num { display: inline-block; font-size: 0.78rem; font-weight: 700; color: var(--gold); background: var(--surface); border-radius: 6px; padding: 1px 8px; margin-bottom: 4px; }

/* ---------- Quick Check (हर ~10 मिनट Reading पर छोटा Card) ---------- */
.qc-overlay { position: fixed; inset: 0; z-index: 9000; display: flex; align-items: flex-end; justify-content: center; background: rgba(0,0,0,0.45); padding: 0; }
.qc-card { width: 100%; max-width: 480px; background: var(--surface); border-radius: 16px 16px 0 0; padding: 16px; box-shadow: 0 -6px 24px rgba(0,0,0,0.35); max-height: 88vh; overflow-y: auto; }
.qc-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.qc-tag { font-weight: 800; color: var(--gold); font-size: 0.95rem; }
.qc-skip { background: none; border: 1px solid var(--line); color: var(--muted); border-radius: 8px; padding: 4px 10px; font-size: 0.82rem; }
.qc-q { font-size: 1.02rem; line-height: 1.7; margin-bottom: 10px; }
.qc-opts { display: flex; flex-direction: column; gap: 8px; }
.qc-opt { text-align: left; background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 0.97rem; display: flex; gap: 8px; }
.qc-opt.right { border-color: var(--green); background: rgba(34,197,94,0.12); }
.qc-opt.wrong { border-color: #ef4444; background: rgba(239,68,68,0.12); }
.qc-quote { margin: 10px 0; padding: 12px 14px; background: var(--surface-2); border-left: 3px solid var(--gold); border-radius: 8px; font-style: italic; line-height: 1.7; }

/* ---------- PYQ ---------- */
.pq-card { display: flex; flex-direction: column; gap: 8px; }
.pq-card .q-text { font-size: 1.04rem; }
.pq-opts { display: flex; flex-direction: column; gap: 6px; }
.pq-opt { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-2); }
.pq-opt b { width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; background: var(--surface); flex: none; font-size: 0.85rem; }
.pq-opt span { flex: 1; overflow-wrap: anywhere; white-space: pre-wrap; }
.pq-opt.right { border-color: var(--green); background: rgba(52, 211, 153, 0.14); }
.pq-opt.right b { background: var(--green); color: #052e1c; }
.pq-ans { border: 1px solid var(--green); background: rgba(52, 211, 153, 0.08); border-radius: 12px; padding: 10px 12px; }
.pq-ans[hidden] { display: none; }
.pq-ans p { margin: 0 0 6px; white-space: pre-wrap; overflow-wrap: anywhere; }
.pq-card[hidden] { display: none; }

/* ---------- Mixed Practice / PYQ Quiz mode ---------- */
.px-best { color: var(--gold); font-weight: 700; }
.px-chap { display: flex; flex-direction: column; gap: 6px; }
.px-chap .kv { margin: 0; font-size: 0.92rem; }

/* बहुत छोटे phone पर नीचे के 6 बटन */
.bottom-nav.x6 button { min-width: 0; padding-left: 2px; padding-right: 2px; }
.bottom-nav.x6 button small { font-size: 0.66rem; white-space: nowrap; }
.bottom-nav.x6 button span { font-size: 1.25rem; }

/* ---------- Sound बटन और panel ---------- */
.sound-btn { cursor: pointer; font-size: 0.95rem; line-height: 1.2; color: var(--text); }
.sound-panel { position: fixed; right: 10px; top: 58px; z-index: 95; display: flex; flex-direction: column; gap: 8px; width: min(280px, calc(100vw - 20px)); padding: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45); }
.sound-panel[hidden] { display: none; }
.sound-panel small { line-height: 1.5; }
.sound-track { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 6px 10px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; font-size: 0.86rem; }
.sound-track span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }

/* ---------- Fun Vault ---------- */
.vt-open-card { text-align: center; background: linear-gradient(135deg, rgba(167, 139, 250, 0.18), rgba(52, 211, 153, 0.12)); }
.vt-clock { font-size: 2.6rem; font-weight: 800; letter-spacing: 2px; margin: 6px 0; color: var(--gold); font-variant-numeric: tabular-nums; }
.vt-card { min-height: 140px; display: flex; flex-direction: column; justify-content: center; gap: 10px; }
.vt-text { font-size: 1.15rem; line-height: 1.8; overflow-wrap: anywhere; margin: 0; }
.vt-answer { font-size: 1.1rem; color: var(--green); font-weight: 700; margin: 0; overflow-wrap: anywhere; }
.vt-answer[hidden] { display: none; }

/* ---------- गणित (LaTeX) और सूत्र के उदाहरण ---------- */
.x-tex { font-family: "Cambria Math", "STIX Two Math", monospace; background: var(--surface-2); border-radius: 6px; padding: 1px 5px; overflow-wrap: anywhere; }
.katex { font-size: 1.08em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; margin: 0.4em 0; }
.nt-formula .katex-display { margin: 0; text-align: left; }
.nt-formula { font-family: inherit; }
.opt-text .katex, .q-text .katex { font-size: 1.05em; }
.nt-examples { margin-top: 12px; padding-top: 8px; border-top: 1px dashed var(--line); display: flex; flex-direction: column; gap: 10px; }
.nt-examples h4 { font-size: 0.98rem; color: var(--green); margin: 0; }
.nt-ex { background: rgba(52, 211, 153, 0.07); border: 1px solid rgba(52, 211, 153, 0.35); border-radius: 12px; padding: 10px 12px; }
.nt-ex .nt-a p { margin: 0 0 6px; }

/* ---------- AI से पूछो (Chat) ---------- */
.ai-page { display: flex; flex-direction: column; gap: 10px; }
.ai-chat { display: flex; flex-direction: column; gap: 10px; max-height: 62vh; overflow-y: auto; padding: 4px 2px; }
.ai-msg { max-width: 86%; padding: 10px 14px; border-radius: 14px; line-height: 1.7; font-size: 0.98rem; overflow-wrap: anywhere; }
.ai-msg.ai-user { align-self: flex-end; background: var(--green); color: #052e1a; border-bottom-right-radius: 4px; }
.ai-msg.ai-model { align-self: flex-start; background: var(--surface-2); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.ai-inputbar { position: sticky; bottom: 0; display: flex; gap: 8px; background: var(--surface); padding: 8px 0 4px; }
.ai-inputbar input { flex: 1; background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; color: var(--text); font-size: 0.98rem; }
.ai-inputbar .btn { flex-shrink: 0; }

/* ---------- Definitions के Term पर Tap करके AI से समझो ---------- */
.nt-term-tap { background: none; border: none; padding: 0; font: inherit; font-weight: 800; color: var(--green); cursor: pointer; text-decoration: underline dotted; text-underline-offset: 3px; }