/* =====================================================================
   MHT Reading Hub · Master Hub Training
   Identidad: azul marino #1E2748 + azul cielo #5BADDF
   Tipografías: Gotham (interfaz), Avenir (lectura), Futura (cifras),
                Raleway Italic (acentos)
   ===================================================================== */

/* ---------- Fuentes de marca ---------- */
@font-face { font-family: "Gotham"; src: url("../fonts/gotham-book.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Gotham"; src: url("../fonts/gotham-bold.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Avenir MHT"; src: url("../fonts/avenir-roman.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Avenir MHT"; src: url("../fonts/avenir-oblique.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Avenir MHT"; src: url("../fonts/avenir-medium.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "Avenir MHT"; src: url("../fonts/avenir-heavy.woff2") format("woff2"); font-weight: 800; font-style: normal; font-display: swap; }
@font-face { font-family: "Futura MHT"; src: url("../fonts/futura-medium.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "Futura MHT"; src: url("../fonts/futura-bold.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Raleway MHT"; src: url("../fonts/raleway-italic-var.woff2") format("woff2"); font-weight: 100 900; font-style: italic; font-display: swap; }

/* ---------- Tokens ---------- */
:root {
  --mht-navy: #1E2748;
  --mht-navy-900: #131a33;
  --mht-navy-700: #2a3561;
  --mht-sky: #5BADDF;
  --mht-sky-700: #1F6FA5;     /* azul cielo con contraste AA para texto sobre blanco */
  --mht-sky-100: #D7ECF9;
  --mht-sky-50: #EEF7FD;
  --mht-gray: #5A5E6B;
  --mht-muted: #6B7280;
  --mht-bg: #F4F7FB;
  --mht-surface: #FFFFFF;
  --mht-border: #E2E8F0;
  --mht-ink: #1B2236;
  --mht-success: #1E8E5A;
  --mht-danger: #C2413B;
  --mht-warning: #B7791F;

  --font-ui: "Gotham", "Avenir MHT", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-reading: "Avenir MHT", "Gotham", "Segoe UI", system-ui, sans-serif;
  --font-display: "Futura MHT", "Gotham", system-ui, sans-serif;
  --font-accent: "Raleway MHT", "Gotham", system-ui, sans-serif;

  --radius-lg: 20px;
  --radius-md: 14px;
  --shadow-sm: 0 1px 2px rgba(19, 26, 51, .06), 0 1px 3px rgba(19, 26, 51, .05);
  --shadow-md: 0 6px 24px rgba(19, 26, 51, .08);
  --reading-size: 1.2rem;

  /* Bootstrap */
  --bs-body-font-family: var(--font-ui);
  --bs-body-color: #2B3350;
  --bs-body-bg: var(--mht-bg);
  --bs-primary: var(--mht-navy);
  --bs-primary-rgb: 30, 39, 72;
  --bs-link-color: var(--mht-sky-700);
  --bs-link-color-rgb: 31, 111, 165;
  --bs-link-hover-color: var(--mht-navy);
  --bs-link-hover-color-rgb: 30, 39, 72;
  --bs-border-color: var(--mht-border);
  --bs-success: var(--mht-success);
  --bs-success-rgb: 30, 142, 90;
  --bs-danger: var(--mht-danger);
  --bs-danger-rgb: 194, 65, 59;
  --bs-focus-ring-color: rgba(91, 173, 223, .45);
}

body { font-family: var(--font-ui); background: var(--mht-bg); color: var(--bs-body-color); -webkit-font-smoothing: antialiased; }
h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 { font-family: var(--font-ui); font-weight: 700; color: var(--mht-navy); letter-spacing: -.01em; }
.text-navy { color: var(--mht-navy) !important; }
.text-sky { color: var(--mht-sky-700) !important; }
.text-muted, .text-body-secondary { color: var(--mht-muted) !important; }
.accent { font-family: var(--font-accent); font-style: italic; font-weight: 500; }
.display-num { font-family: var(--font-display); font-weight: 700; letter-spacing: -.02em; }
.small-caps { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; font-weight: 700; color: var(--mht-muted); }
:focus-visible { outline: 3px solid var(--mht-sky); outline-offset: 2px; }
[tabindex="-1"]:focus { outline: none; }

/* ---------- Botones ---------- */
.btn { font-weight: 700; border-radius: 12px; }
.btn-primary {
  --bs-btn-bg: var(--mht-navy); --bs-btn-border-color: var(--mht-navy);
  --bs-btn-hover-bg: var(--mht-navy-700); --bs-btn-hover-border-color: var(--mht-navy-700);
  --bs-btn-active-bg: var(--mht-navy-900); --bs-btn-active-border-color: var(--mht-navy-900);
  --bs-btn-disabled-bg: #8d94ab; --bs-btn-disabled-border-color: #8d94ab;
}
.btn-sky {
  --bs-btn-color: var(--mht-navy); --bs-btn-bg: var(--mht-sky); --bs-btn-border-color: var(--mht-sky);
  --bs-btn-hover-color: var(--mht-navy); --bs-btn-hover-bg: #79bde6; --bs-btn-hover-border-color: #79bde6;
  --bs-btn-active-color: var(--mht-navy); --bs-btn-active-bg: #4a9fd3; --bs-btn-active-border-color: #4a9fd3;
  --bs-btn-disabled-color: var(--mht-navy); --bs-btn-disabled-bg: #a9d3ee; --bs-btn-disabled-border-color: #a9d3ee;
}
.btn-outline-primary {
  --bs-btn-color: var(--mht-navy); --bs-btn-border-color: #c7cde0;
  --bs-btn-hover-bg: var(--mht-navy); --bs-btn-hover-border-color: var(--mht-navy);
  --bs-btn-active-bg: var(--mht-navy-900); --bs-btn-active-border-color: var(--mht-navy-900);
}
.btn-light { --bs-btn-bg: #fff; --bs-btn-border-color: var(--mht-border); --bs-btn-hover-bg: var(--mht-sky-50); --bs-btn-hover-border-color: var(--mht-sky-100); }
.btn-icon { width: 36px; height: 36px; padding: 0; display: inline-grid; place-items: center; border-radius: 10px; }
.btn-lg { border-radius: 14px; padding: .8rem 1.4rem; }

/* ---------- Formularios ---------- */
.form-control, .form-select { border-radius: 12px; border-color: #d5dcea; padding: .62rem .9rem; }
.form-control:focus, .form-select:focus { border-color: var(--mht-sky); box-shadow: 0 0 0 .25rem rgba(91, 173, 223, .25); }
.form-label { font-weight: 700; font-size: .9rem; color: var(--mht-navy); }
.form-text { color: var(--mht-muted); }
.text-uppercase::placeholder { text-transform: none; }
.form-check-input:checked { background-color: var(--mht-navy); border-color: var(--mht-navy); }
.form-switch .form-check-input:checked { background-color: var(--mht-sky-700); border-color: var(--mht-sky-700); }

/* ---------- Tarjetas y utilidades ---------- */
.card { border: 1px solid var(--mht-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.card-header { background: transparent; border-bottom-color: var(--mht-border); padding: 1rem 1.25rem; }
.card-body { padding: 1.25rem; }
.table { --bs-table-hover-bg: var(--mht-sky-50); vertical-align: middle; }
.table > thead th { font-size: .74rem; text-transform: uppercase; letter-spacing: .06em; color: var(--mht-muted); font-weight: 700; border-bottom-width: 1px; white-space: nowrap; }
.table-card { border-radius: var(--radius-lg); overflow: hidden; }
.table-card .table { margin: 0; }
.table-card .table > :not(caption) > * > * { padding: .8rem 1rem; }
.badge { font-weight: 700; border-radius: 999px; padding: .38em .7em; }
.badge-soft-success { background: #E3F4EC; color: #17714A; }
.badge-soft-danger { background: #FBE9E8; color: #A3342F; }
.badge-soft-warning { background: #FDF3DE; color: #8A5A12; }
.badge-soft-secondary { background: #EEF1F6; color: #4B5468; }
.badge-soft-info { background: var(--mht-sky-50); color: var(--mht-sky-700); }
.badge-lang { display: inline-block; font-family: var(--font-display); font-weight: 700; font-size: .72rem; letter-spacing: .06em; padding: .3em .6em; border-radius: 8px; }
.badge-lang-en { background: var(--mht-navy); color: #fff; }
.badge-lang-fr { background: var(--mht-sky-100); color: var(--mht-navy); }
.code-chip { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-weight: 600; letter-spacing: .04em; background: var(--mht-sky-50); color: var(--mht-navy); border: 1px dashed #a9d3ee; border-radius: 8px; padding: .2rem .5rem; white-space: nowrap; }
.empty-state { text-align: center; padding: 3rem 1.5rem; color: var(--mht-muted); }
.empty-state .bi { font-size: 2.4rem; color: var(--mht-sky); display: block; margin-bottom: .75rem; }
.empty-state h3 { font-size: 1.1rem; margin-bottom: .35rem; }
.alert { border-radius: var(--radius-md); border: 0; }
.alert-info { background: var(--mht-sky-50); color: var(--mht-navy); }

/* =====================================================================
   PANEL DE ADMINISTRADOR
   ===================================================================== */
.admin-shell { display: flex; min-height: 100vh; }
.admin-sidebar { width: 264px; flex-shrink: 0; background: var(--mht-navy); color: #fff; }
/* Bootstrap deja transparente .offcanvas-lg en escritorio: se fuerza el azul de marca. */
.admin-sidebar.offcanvas-lg { background-color: var(--mht-navy) !important; }
@media (min-width: 992px) {
  .admin-sidebar { position: sticky; top: 0; height: 100vh; overflow-y: auto; }
}
.admin-sidebar .offcanvas-header, .admin-sidebar .sidebar-brand { padding: 1.4rem 1.4rem 1rem; }
.admin-sidebar.offcanvas-lg { --bs-offcanvas-bg: var(--mht-navy); --bs-offcanvas-color: #fff; --bs-offcanvas-width: 280px; }
.sidebar-brand img { width: 170px; height: auto; display: block; }
.sidebar-tag { font-family: var(--font-accent); font-style: italic; color: var(--mht-sky); font-size: .95rem; margin-top: .4rem; }
.admin-nav { padding: .5rem .8rem 1.5rem; }
.admin-nav .nav-link { color: rgba(255, 255, 255, .78); border-radius: 12px; padding: .7rem .9rem; display: flex; gap: .75rem; align-items: center; font-size: .94rem; }
.admin-nav .nav-link .bi { font-size: 1.1rem; width: 1.2rem; text-align: center; }
.admin-nav .nav-link:hover { background: rgba(255, 255, 255, .07); color: #fff; }
.admin-nav .nav-link.active { background: var(--mht-sky); color: var(--mht-navy); font-weight: 700; }
.admin-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.admin-topbar { background: #fff; border-bottom: 1px solid var(--mht-border); padding: .8rem 1.5rem; display: flex; align-items: center; gap: 1rem; position: sticky; top: 0; z-index: 1020; }
.admin-topbar .page-title { font-size: 1.15rem; margin: 0; }
.admin-content { padding: 1.5rem; max-width: 1320px; width: 100%; }
@media (max-width: 575.98px) { .admin-content { padding: 1rem; } .admin-topbar { padding: .7rem 1rem; } }
.admin-avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--mht-sky-100); color: var(--mht-navy); display: grid; place-items: center; font-weight: 700; font-size: .85rem; }

.stat-card { padding: 1.25rem; display: flex; flex-direction: row; gap: 1rem; align-items: center; height: 100%; }
@media (max-width: 575.98px) { .stat-card { padding: 1rem; gap: .75rem; } .stat-icon { width: 40px; height: 40px; font-size: 1.1rem; } .stat-value { font-size: 1.5rem; } }
.stat-icon { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; font-size: 1.35rem; flex-shrink: 0; background: var(--mht-sky-50); color: var(--mht-sky-700); }
.stat-icon.navy { background: var(--mht-navy); color: #fff; }
.stat-value { font-family: var(--font-display); font-weight: 700; font-size: 1.8rem; line-height: 1; color: var(--mht-navy); }
.stat-label { font-size: .82rem; color: var(--mht-muted); margin-top: .25rem; }

.filter-bar { background: #fff; border: 1px solid var(--mht-border); border-radius: var(--radius-lg); padding: 1rem; margin-bottom: 1rem; }
.level-card + .level-card { margin-top: 1rem; }
.class-row { display: flex; align-items: center; gap: .75rem; padding: .65rem 1rem; border-top: 1px solid var(--mht-border); }
.class-row:hover { background: var(--mht-sky-50); }
.class-row .class-name { flex: 1; min-width: 0; font-weight: 600; }
.order-pill { font-family: var(--font-display); font-weight: 700; color: var(--mht-muted); min-width: 1.6rem; text-align: center; }

.word-counter { font-family: var(--font-display); font-weight: 700; }
.word-counter.ok { color: var(--mht-success); }
.word-counter.bad { color: var(--mht-danger); }
.upload-box { border: 2px dashed #cfd8e8; border-radius: var(--radius-md); padding: 1rem; background: #fafcff; }
.question-editor { border-left: 4px solid var(--mht-sky); }
.question-editor .q-number { width: 34px; height: 34px; border-radius: 50%; background: var(--mht-navy); color: #fff; display: grid; place-items: center; font-family: var(--font-display); font-weight: 700; flex-shrink: 0; }
.option-editor { display: flex; gap: .6rem; align-items: center; }
.option-editor .form-check-input { width: 1.3rem; height: 1.3rem; margin: 0; flex-shrink: 0; }
.preview-banner { background: repeating-linear-gradient(135deg, #FDF3DE 0 14px, #fbeccc 14px 28px); color: #7a4f10; font-weight: 700; text-align: center; padding: .55rem 1rem; font-size: .9rem; }

/* =====================================================================
   ACCESO DEL ALUMNO
   ===================================================================== */
.auth-page { min-height: 100vh; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); background: #fff; }
.auth-brand { position: relative; overflow: hidden; background: linear-gradient(155deg, var(--mht-navy) 0%, #24305a 55%, #2d3d72 100%); color: #fff; padding: 3rem clamp(1.5rem, 5vw, 4.5rem); display: flex; flex-direction: column; justify-content: space-between; }
.auth-brand::after { content: ""; position: absolute; right: -12%; bottom: -10%; width: 70%; aspect-ratio: 9 / 11; background: url("../img/imagotipo-watermark.png") no-repeat center / contain; opacity: .16; filter: brightness(2.4); pointer-events: none; }
.auth-brand img.brand-logo { width: min(250px, 60%); height: auto; }
.auth-brand h1 { color: #fff; font-size: clamp(2rem, 3.6vw, 3rem); line-height: 1.1; margin: 2rem 0 1rem; max-width: 14ch; }
.auth-brand h1 span { color: var(--mht-sky); }
.auth-brand .lead { color: rgba(255, 255, 255, .8); max-width: 38ch; font-size: 1.05rem; }
.auth-brand .accent { color: var(--mht-sky); font-size: 1.15rem; }
.auth-features { list-style: none; padding: 0; margin: 2rem 0 0; display: grid; gap: .85rem; position: relative; z-index: 1; }
.auth-features li { display: flex; gap: .8rem; align-items: center; color: rgba(255, 255, 255, .88); }
.auth-features .bi { width: 38px; height: 38px; border-radius: 12px; background: rgba(91, 173, 223, .18); color: var(--mht-sky); display: grid; place-items: center; font-size: 1.1rem; flex-shrink: 0; }
.auth-panel { display: flex; align-items: center; justify-content: center; padding: 2.5rem 1.25rem; }
.auth-form { width: 100%; max-width: 420px; }
.auth-form h2 { font-size: 1.6rem; }
.code-input { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.35rem !important; letter-spacing: .12em; text-transform: uppercase; text-align: center; padding: .9rem 1rem !important; }
.auth-mobile-logo { display: none; }
@media (max-width: 991.98px) {
  .auth-page { grid-template-columns: 1fr; }
  .auth-brand { display: none; }
  .auth-mobile-logo { display: block; width: 190px; margin: 0 auto 1.75rem; }
  .auth-panel { align-items: flex-start; padding-top: 2.5rem; background: linear-gradient(180deg, var(--mht-sky-50), #fff 320px); }
}

/* =====================================================================
   EXPERIENCIA DEL ALUMNO
   ===================================================================== */
.student-header { background: #fff; border-bottom: 1px solid var(--mht-border); position: sticky; top: 0; z-index: 1030; }
.student-header .inner { max-width: 980px; margin: 0 auto; padding: .7rem 1rem; display: flex; align-items: center; gap: .75rem; }
.student-header .logo { height: 52px; width: auto; }
.student-header .logo-mark { height: 40px; width: 40px; }
.student-chip { display: flex; align-items: center; gap: .6rem; margin-left: auto; min-width: 0; }
.student-chip .who { text-align: right; line-height: 1.2; min-width: 0; }
.student-chip .who strong { display: block; color: var(--mht-navy); font-size: .9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 36vw; }
.student-chip .who span { font-size: .75rem; color: var(--mht-muted); white-space: nowrap; }
.student-main { max-width: 980px; margin: 0 auto; padding: 1.5rem 1rem 4rem; }
.student-footer { text-align: center; font-size: .8rem; color: var(--mht-muted); padding: 1.5rem 1rem 2rem; }
.student-footer .accent { color: var(--mht-sky-700); }

.class-hero { background: linear-gradient(135deg, var(--mht-navy), #2b3a6d); color: #fff; border-radius: var(--radius-lg); padding: 1.6rem; position: relative; overflow: hidden; }
.class-hero::after { content: ""; position: absolute; right: -40px; top: -30px; width: 220px; height: 260px; background: url("../img/imagotipo-watermark.png") no-repeat center / contain; opacity: .14; filter: brightness(2.4); }
.class-hero h1 { color: #fff; font-size: clamp(1.4rem, 3.5vw, 1.9rem); margin: .2rem 0 .3rem; }
.class-hero .eyebrow { color: var(--mht-sky); font-family: var(--font-accent); font-style: italic; font-size: 1.05rem; }
.hero-progress { margin-top: 1.2rem; position: relative; z-index: 1; }
.hero-progress .progress { height: 10px; background: rgba(255, 255, 255, .15); border-radius: 99px; }
.hero-progress .progress-bar { background: var(--mht-sky); border-radius: 99px; }

.reading-tile { display: flex; gap: 1rem; align-items: center; padding: 1.1rem 1.2rem; background: #fff; border: 1px solid var(--mht-border); border-radius: var(--radius-lg); text-decoration: none; color: inherit; transition: border-color .15s, box-shadow .15s, transform .15s; }
.reading-tile:hover { border-color: var(--mht-sky); box-shadow: var(--shadow-md); transform: translateY(-1px); color: inherit; }
.reading-tile .num { width: 48px; height: 48px; border-radius: 14px; background: var(--mht-sky-50); color: var(--mht-navy); display: grid; place-items: center; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; flex-shrink: 0; }
.reading-tile.done .num { background: #E3F4EC; color: #17714A; }
.reading-tile h2 { font-size: 1.05rem; margin: 0 0 .2rem; }
.reading-tile .meta { font-size: .82rem; color: var(--mht-muted); display: flex; flex-wrap: wrap; gap: .35rem .9rem; align-items: center; }
.reading-tile .go { margin-left: auto; color: var(--mht-sky-700); font-size: 1.3rem; flex-shrink: 0; }

/* Barra de progreso de lectura (arriba de la página) */
.read-progress { position: fixed; left: 0; right: 0; top: 0; height: 4px; z-index: 1050; background: transparent; }
.read-progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--mht-sky), var(--mht-navy)); transition: width .1s linear; }

.steps { display: flex; gap: .5rem; list-style: none; padding: 0; margin: 0 0 1.25rem; flex-wrap: wrap; }
.steps li { display: flex; align-items: center; gap: .45rem; font-size: .82rem; font-weight: 700; color: var(--mht-muted); background: #fff; border: 1px solid var(--mht-border); padding: .35rem .8rem .35rem .4rem; border-radius: 99px; }
.steps li b { width: 22px; height: 22px; border-radius: 50%; background: #EEF1F6; display: grid; place-items: center; font-family: var(--font-display); font-size: .75rem; }
.steps li.active { color: var(--mht-navy); border-color: var(--mht-sky); }
.steps li.active b { background: var(--mht-sky); color: var(--mht-navy); }
.steps li.done b { background: var(--mht-navy); color: #fff; }

.reading-title { font-size: clamp(1.6rem, 4.2vw, 2.3rem); margin: .25rem 0 .5rem; }
.reading-figure { border-radius: var(--radius-lg); overflow: hidden; margin: 0 0 1.25rem; background: #fff; border: 1px solid var(--mht-border); }
.reading-figure img { width: 100%; max-height: 380px; object-fit: cover; display: block; }

.reading-card { background: #fff; border: 1px solid var(--mht-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); padding: clamp(1.4rem, 4.5vw, 3rem); }
.reading-text { font-family: var(--font-reading); font-size: var(--reading-size); line-height: 1.85; color: var(--mht-ink); max-width: 68ch; margin: 0 auto; }
.reading-text p { margin: 0 0 1.1em; }
.reading-text p:last-child { margin-bottom: 0; }
.reading-toolbar { display: flex; justify-content: space-between; align-items: center; gap: .75rem; flex-wrap: wrap; margin-bottom: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--mht-border); }
.font-size-ctrl .btn { font-family: var(--font-reading); min-width: 42px; }

/* ---------- Reproductor de audio ---------- */
.mht-player { background: linear-gradient(135deg, var(--mht-navy), #28366a); color: #fff; border-radius: var(--radius-lg); padding: 1rem 1.2rem; display: flex; align-items: center; gap: 1rem; box-shadow: var(--shadow-md); margin-bottom: 1.25rem; }
@media (min-width: 768px) { .mht-player { position: sticky; top: 84px; z-index: 1010; } }
.mht-player .play-btn { width: 64px; height: 64px; border-radius: 50%; border: 0; background: var(--mht-sky); color: var(--mht-navy); display: grid; place-items: center; font-size: 1.9rem; flex-shrink: 0; transition: transform .12s, background .15s; }
.mht-player .play-btn:hover { background: #7cc0e8; transform: scale(1.04); }
.mht-player .play-btn:disabled { opacity: .5; }
.mht-player .body { flex: 1; min-width: 0; }
.mht-player .label { font-size: .78rem; color: rgba(255, 255, 255, .7); display: flex; justify-content: space-between; gap: .5rem; margin-bottom: .35rem; }
.mht-player .label strong { color: #fff; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mht-player .time { font-family: var(--font-display); font-weight: 500; font-variant-numeric: tabular-nums; font-size: .82rem; color: rgba(255, 255, 255, .85); white-space: nowrap; }
.mht-player .seek { width: 100%; -webkit-appearance: none; appearance: none; height: 8px; border-radius: 99px; background: linear-gradient(90deg, var(--mht-sky) var(--p, 0%), rgba(255, 255, 255, .2) var(--p, 0%)); cursor: pointer; margin: .2rem 0; }
.mht-player .seek::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%; background: #fff; border: 3px solid var(--mht-sky); }
.mht-player .seek::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 3px solid var(--mht-sky); }
.mht-player .controls { display: flex; align-items: center; gap: .5rem; margin-top: .4rem; flex-wrap: wrap; }
.mht-player .ctrl { background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .18); color: #fff; border-radius: 10px; padding: .3rem .65rem; font-size: .82rem; font-weight: 700; display: inline-flex; gap: .35rem; align-items: center; text-decoration: none; }
.mht-player .ctrl:hover { background: rgba(255, 255, 255, .18); color: #fff; }
.mht-player .speed { display: inline-flex; background: rgba(255, 255, 255, .08); border-radius: 10px; padding: 3px; gap: 2px; }
.mht-player .speed button { background: transparent; border: 0; color: rgba(255, 255, 255, .8); font-family: var(--font-display); font-weight: 700; font-size: .8rem; padding: .25rem .55rem; border-radius: 8px; }
.mht-player .speed button[aria-pressed="true"] { background: var(--mht-sky); color: var(--mht-navy); }
.mht-player .listened { margin-left: auto; font-size: .75rem; color: var(--mht-sky); display: none; align-items: center; gap: .3rem; }
.mht-player.has-ended .listened { display: inline-flex; }
.no-audio { background: #fff; border: 1px dashed #cfd8e8; border-radius: var(--radius-lg); padding: 1rem 1.2rem; color: var(--mht-muted); display: flex; gap: .75rem; align-items: center; margin-bottom: 1.25rem; }
@media (max-width: 575.98px) {
  .mht-player { padding: .85rem; gap: .75rem; border-radius: 16px; }
  .mht-player .play-btn { width: 54px; height: 54px; font-size: 1.6rem; }
  .student-header .logo { height: 40px; }
}

/* ---------- Preguntas ---------- */
.ready-box { text-align: center; padding: 1.75rem 1rem; }
.q-card { background: #fff; border: 1px solid var(--mht-border); border-radius: var(--radius-lg); padding: 1.25rem; margin-bottom: 1rem; box-shadow: var(--shadow-sm); }
.q-card legend { font-size: 1.08rem; font-weight: 700; color: var(--mht-navy); display: flex; gap: .7rem; margin-bottom: .9rem; }
.q-card legend .n { width: 30px; height: 30px; border-radius: 50%; background: var(--mht-sky-50); color: var(--mht-navy); display: grid; place-items: center; font-family: var(--font-display); flex-shrink: 0; font-size: .95rem; }
.option-tile { display: flex; align-items: center; gap: .8rem; border: 2px solid var(--mht-border); border-radius: 14px; padding: .8rem 1rem; margin-bottom: .55rem; cursor: pointer; font-family: var(--font-reading); font-size: 1.05rem; color: var(--mht-ink); transition: border-color .12s, background .12s; }
.option-tile:hover { border-color: #a9d3ee; background: #fbfdff; }
.option-tile input { width: 1.2rem; height: 1.2rem; accent-color: var(--mht-navy); flex-shrink: 0; margin: 0; }
.option-tile.is-selected, .option-tile:has(input:checked) { border-color: var(--mht-navy); background: var(--mht-sky-50); }
.answer-bar { position: sticky; bottom: 0; background: rgba(244, 247, 251, .94); backdrop-filter: blur(6px); padding: .85rem 0; margin-top: 1rem; border-top: 1px solid var(--mht-border); z-index: 5; }

/* ---------- Resultado ---------- */
.score-ring { --pct: 0; --tone: var(--mht-sky); width: 170px; height: 170px; border-radius: 50%; background: conic-gradient(var(--tone) calc(var(--pct) * 1%), #E7ECF4 0); display: grid; place-items: center; margin: 0 auto; }
.score-ring > div { width: 136px; height: 136px; border-radius: 50%; background: #fff; display: grid; place-items: center; text-align: center; }
.score-ring .big { font-family: var(--font-display); font-weight: 700; font-size: 2.6rem; color: var(--mht-navy); line-height: 1; }
.score-ring .sub { font-size: .8rem; color: var(--mht-muted); }
.review-item { border: 1px solid var(--mht-border); border-radius: var(--radius-md); padding: 1rem 1.1rem; background: #fff; }
.review-item + .review-item { margin-top: .75rem; }
.review-item.ok { border-left: 5px solid var(--mht-success); }
.review-item.ko { border-left: 5px solid var(--mht-danger); }
.review-item .ans { font-family: var(--font-reading); }
.review-item .feedback { background: var(--mht-sky-50); border-radius: 10px; padding: .55rem .8rem; font-size: .9rem; margin-top: .6rem; color: var(--mht-navy); }

@media print {
  .admin-sidebar, .admin-topbar, .student-header, .mht-player, .answer-bar { display: none !important; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}