/* ==========================================================================
   WAIC — e-learning module styles.
   Three contexts:
     1. Public catalogue & course page (body.site, on top of site.css — dark "Circuits & Faces")
     2. Dashboard pages: member courses/certificates, trainer & admin tools (on top of app.css)
     3. Focused player / exam / result (views/learning/layout.php: app.css + this file)
   ========================================================================== */

/* ---------------------------------------------------------------- shared bits */
.lbar { position: relative; display: block; flex: 1; height: 6px; border-radius: 999px; background: rgba(127, 120, 160, .22); overflow: hidden; }
.lbar > i { position: absolute; inset: 0 auto 0 0; border-radius: inherit; background: linear-gradient(90deg, var(--crimson), #FF5A7E); transition: width .6s cubic-bezier(.22, 1, .36, 1); }
.row-sb { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* branded cover fallback (no image) */
.lc-fallback { position: absolute; inset: 0; display: grid; place-items: center; overflow: hidden; color: #8DA2FF; }
.lc-fallback svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.lc-fallback img { position: relative; width: 26%; max-width: 120px; height: auto; filter: drop-shadow(0 10px 30px rgba(0, 0, 0, .35)); }
.lc-fallback-0 { background: radial-gradient(120% 90% at 100% 0%, rgba(229, 0, 74, .55), transparent 60%), radial-gradient(90% 90% at 0% 100%, rgba(31, 63, 184, .55), transparent 60%), #19152B; }
.lc-fallback-1 { background: radial-gradient(120% 90% at 0% 0%, rgba(11, 122, 52, .6), transparent 60%), radial-gradient(90% 90% at 100% 100%, rgba(229, 0, 74, .45), transparent 60%), #19152B; color: #7FE0A4; }
.lc-fallback-2 { background: radial-gradient(120% 90% at 100% 100%, rgba(201, 162, 39, .45), transparent 60%), radial-gradient(90% 90% at 0% 0%, rgba(31, 63, 184, .6), transparent 60%), #19152B; color: #E2C25A; }

/* ==========================================================================
   1. PUBLIC (dark)
   ========================================================================== */
.site .lhero { padding-bottom: clamp(36px, 5vw, 64px); }
.lhero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 40px; align-items: end; }
.lhero-grid > *, .chero-grid > *, .cbody > * { min-width: 0; }
@media (min-width: 1024px) { .lhero-grid { grid-template-columns: minmax(0, 1fr) 380px; gap: 72px; } }
.site .lhero .h1 { max-width: 14ch; }
.lsearch { display: flex; align-items: center; gap: 10px; margin-top: 28px; max-width: 560px; padding: 6px 6px 6px 18px; border-radius: 999px; border: 1px solid var(--line-2); background: rgba(244, 241, 250, .05); transition: border-color .25s, background-color .25s; }
.lsearch:focus-within { border-color: var(--text); background: rgba(244, 241, 250, .08); }
.lsearch .icon { color: var(--dim); }
.lsearch input { flex: 1; min-width: 0; border: 0; background: none; color: var(--text); font: 400 1rem/1.4 var(--font); padding: 10px 0; outline: none; }
.lsearch input::placeholder { color: var(--dim); }
.lsearch input::-webkit-search-cancel-button { filter: invert(1); }
.lhero-stats { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; border-top: 1px solid var(--line); }
.lhero-stats > div { padding: 18px 0 0; }
.lhero-stats > div + div { padding-left: 18px; border-left: 1px solid var(--line); }
.lhero-stats dt { font: 500 .82rem/1.3 var(--font-tech); color: var(--dim); order: 2; }
.lhero-stats dd { margin: 0 0 4px; font: 500 clamp(2.2rem, 4vw, 3.2rem)/1 var(--font-display); letter-spacing: -.02em; }
.lhero-stats > div { display: flex; flex-direction: column-reverse; }

.lfilters { display: grid; gap: 16px; margin-bottom: 18px; }
.lfilters .chips { margin: 0; }
.chip-n { display: inline-grid; place-items: center; min-width: 22px; height: 22px; margin-left: 4px; padding: 0 6px; border-radius: 999px; background: rgba(244, 241, 250, .1); font: 500 .74rem/1 var(--font-tech); }
.chip[aria-current] .chip-n { background: rgba(18, 15, 31, .12); }
.lselects { display: flex; flex-wrap: wrap; gap: 10px; }
.lselects label { flex: 1 1 200px; max-width: 260px; }
.lselects .in { min-height: 46px; padding: 10px 40px 10px 16px; border-radius: 999px; font-size: .92rem; }
@media (min-width: 1100px) { .lfilters { grid-template-columns: 1fr auto; align-items: center; } .lselects label { flex: 0 0 auto; } .lselects .in { width: auto; } }
@media (max-width: 640px) { .lselects label { flex: 1 1 100%; max-width: none; } }
.lresults-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 14px 0 26px; border-top: 1px solid var(--line); margin-top: 8px; }
.lresults-head p { margin: 0; font-size: .9rem; }

/* course card */
.lgrid { align-items: stretch; }
.lcard { position: relative; display: flex; flex-direction: column; border-radius: var(--r-lg); background: var(--ink-2); border: 1px solid var(--line); overflow: hidden; transition: transform .6s var(--ease), border-color .4s, box-shadow .6s var(--ease); }
.lcard:hover { transform: translateY(-6px); border-color: var(--line-2); box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .7), 0 0 0 1px rgba(255, 79, 132, .12); }
.lcard:focus-within { outline: 2px solid var(--gold-hi); outline-offset: 4px; }
.lcard-media { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: var(--ink-3); }
.lcard-media > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--ease); }
.lcard:hover .lcard-media > img { transform: scale(1.05); }
.lcard-media::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(25, 21, 43, .85), transparent 55%); pointer-events: none; }
.lcard-flags { position: absolute; left: 14px; top: 14px; right: 14px; z-index: 2; display: flex; flex-wrap: wrap; gap: 6px; }
.lflag { display: inline-flex; align-items: center; gap: 6px; padding: 6px 11px; border-radius: 999px; font: 500 .76rem/1 var(--font-tech); background: rgba(18, 15, 31, .72); color: var(--text); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); border: 1px solid rgba(244, 241, 250, .14); }
.lflag .icon { width: 13px; height: 13px; }
.lflag-gold { color: #F3E3AE; border-color: rgba(226, 194, 90, .45); }
.lflag-crimson { background: rgba(229, 0, 74, .85); border-color: transparent; color: #fff; }
.lcard-body { display: flex; flex-direction: column; gap: 12px; padding: 22px 24px 22px; flex: 1; }
.lcard-cat { margin: 0; font: 500 .8rem/1.2 var(--font-tech); color: var(--gold-hi); letter-spacing: .02em; }
.lcard-title { font: 500 clamp(1.3rem, 1.7vw, 1.55rem)/1.18 var(--font-display); letter-spacing: -.005em; }
.lcard-title a::after { content: ''; position: absolute; inset: 0; z-index: 1; }
.lcard-title a:focus-visible { outline: none; }
.lcard-sum { margin: 0; color: var(--muted); font-size: .94rem; line-height: 1.6; }
.lcard-meta { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 16px; color: var(--dim); font: 400 .84rem/1.3 var(--font-tech); }
.lcard-meta li { display: inline-flex; align-items: center; gap: 6px; }
.lcard-meta .icon { width: 15px; height: 15px; color: var(--muted); }
.lcard-progress { display: flex; align-items: center; gap: 12px; font: 500 .82rem/1 var(--font-tech); color: var(--green-hi); }
.lcard-progress .lbar > i { background: linear-gradient(90deg, var(--green), var(--green-hi)); }
.lcard-foot { margin-top: auto; padding-top: 16px; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.lcard-trainer { display: inline-flex; align-items: center; gap: 10px; color: var(--muted); font-size: .88rem; min-width: 0; }
.lav { width: 30px; height: 30px; flex: none; border-radius: 50%; overflow: hidden; display: grid; place-items: center; font: 600 .72rem/1 var(--font-tech); color: #fff; background: conic-gradient(from 210deg, var(--crimson), var(--blue), var(--green), var(--crimson)); }
.lav img { width: 100%; height: 100%; object-fit: cover; }
.lprice { font: 600 1rem/1 var(--font-tech); white-space: nowrap; }
.lprice.is-free { color: var(--green-hi); }

/* course page hero */
.chero { position: relative; padding: calc(var(--hdr-h) + clamp(28px, 5vw, 64px)) 0 clamp(40px, 6vw, 80px); overflow: hidden; isolation: isolate; }
.chero-bg { position: absolute; inset: 0; z-index: -1; opacity: .22; filter: blur(40px) saturate(1.2); transform: scale(1.2); }
.chero-bg > img, .chero-bg .lc-fallback { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.chero::after { content: ''; position: absolute; inset: 0; z-index: -1; background: linear-gradient(180deg, rgba(18, 15, 31, .2), var(--ink) 92%); }
.chero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 40px; margin-top: 8px; }
@media (min-width: 1100px) { .chero-grid { grid-template-columns: minmax(0, 1fr) 400px; gap: 72px; align-items: start; } }
.chero-title { font-size: clamp(2.2rem, 5.2vw, 4.4rem) !important; max-width: 18ch; margin-bottom: 22px; }
.chero-facts { list-style: none; margin: 34px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--line); }
.chero-facts li { display: flex; gap: 12px; align-items: flex-start; padding: 18px 12px 0 0; }
.chero-facts .icon { color: var(--crimson-hi); margin-top: 3px; }
.chero-facts span { display: flex; flex-direction: column; color: var(--dim); font: 400 .82rem/1.35 var(--font-tech); }
.chero-facts b { color: var(--text); font: 500 1.35rem/1.2 var(--font-display); }
@media (min-width: 760px) { .chero-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.chero-card { border-radius: var(--r-lg); overflow: hidden; background: rgba(25, 21, 43, .9); border: 1px solid var(--line-2); box-shadow: 0 40px 80px -40px rgba(0, 0, 0, .8); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); }
@media (min-width: 1100px) { .chero-card { position: sticky; top: calc(var(--hdr-h) + 20px); } }
.chero-card-media { position: relative; aspect-ratio: 16 / 9; background: var(--ink-3); }
.chero-card-media > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.chero-card-body { padding: 24px; display: grid; gap: 14px; }
.chero-price { margin: 0; font: 500 2.2rem/1 var(--font-display); letter-spacing: -.02em; }
.chero-price.is-free { color: var(--green-hi); }
.chero-card .btn-block { width: 100%; }
.chero-card .form-note .icon { width: 14px; height: 14px; vertical-align: -2px; }
.chero-card .form-note .link-arrow { padding: 0; }
.chero-includes { list-style: none; margin: 6px 0 0; padding: 16px 0 0; border-top: 1px solid var(--line); display: grid; gap: 10px; color: var(--muted); font-size: .9rem; }
.chero-includes li { display: flex; gap: 10px; align-items: center; }
.chero-includes .icon { width: 16px; height: 16px; color: var(--gold-hi); }
.lcta-progress { display: flex; align-items: center; gap: 12px; font: 500 .9rem/1 var(--font-tech); color: var(--green-hi); }
.lcta-progress .lbar > i { background: linear-gradient(90deg, var(--green), var(--green-hi)); }

/* course page body */
.cbody { display: grid; grid-template-columns: minmax(0, 1fr); gap: 56px; }
@media (min-width: 1100px) { .cbody { grid-template-columns: minmax(0, 1fr) 400px; gap: 72px; } }
.cbody-main { display: grid; gap: clamp(48px, 6vw, 80px); min-width: 0; }
.cblock .h3 { margin-bottom: 24px; }
.cobjectives { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
@media (min-width: 760px) { .cobjectives { grid-template-columns: 1fr 1fr; gap: 18px 32px; } }
.cobjectives li { display: flex; gap: 14px; align-items: flex-start; color: var(--text); line-height: 1.55; }
.cobjectives .icon { flex: none; width: 26px; height: 26px; padding: 5px; border-radius: 50%; background: rgba(70, 196, 116, .14); color: var(--green-hi); margin-top: 1px; }
.lprose { color: var(--text); font-size: 1.02rem; }
.lprose > p:first-child { font-size: 1.1rem; }
.site .lprose > p + p { margin-top: 1.1em; }
.caccordion { border-top: 1px solid var(--line); }
.caccordion details { border-bottom: 1px solid var(--line); }
.caccordion summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 18px; padding: 22px 0; }
.caccordion summary::-webkit-details-marker { display: none; }
.caccordion summary::after { content: '+'; margin-left: auto; font: 300 1.6rem/1 var(--font); color: var(--muted); transition: transform .3s var(--ease); }
.caccordion details[open] summary::after { transform: rotate(45deg); }
.cmod-n { font: 500 .9rem/1 var(--font-tech); color: var(--crimson-hi); min-width: 2ch; }
.cmod-t { display: flex; flex-direction: column; gap: 4px; font: 500 1.25rem/1.25 var(--font-display); }
.cmod-t small { font: 400 .82rem/1.2 var(--font-tech); color: var(--dim); }
.clessons { list-style: none; margin: 0 0 18px; padding: 0 0 0 38px; display: grid; gap: 2px; }
.clessons li { display: flex; align-items: center; gap: 12px; padding: 11px 14px; border-radius: 12px; color: var(--muted); font-size: .95rem; }
.clessons li:hover { background: rgba(244, 241, 250, .04); }
.cl-ic { width: 30px; height: 30px; flex: none; border-radius: 9px; display: grid; place-items: center; background: rgba(244, 241, 250, .06); color: var(--muted); }
.cl-ic .icon { width: 15px; height: 15px; }
.cl-t { flex: 1; min-width: 0; }
.cl-t a { color: var(--text); background: linear-gradient(currentColor, currentColor) left bottom / 0 1px no-repeat; transition: background-size .4s var(--ease); }
.cl-t a:hover { background-size: 100% 1px; }
.cl-d { font: 400 .8rem/1 var(--font-tech); color: var(--dim); white-space: nowrap; }
.cl-lock .icon { width: 14px; height: 14px; color: var(--dim); }
.cfinal { display: flex; gap: 14px; align-items: flex-start; margin-top: 22px; padding: 20px 22px; border-radius: var(--r); background: linear-gradient(120deg, rgba(229, 0, 74, .16), rgba(201, 162, 39, .08)); border: 1px solid rgba(255, 79, 132, .3); }
.cfinal .cl-ic { background: var(--crimson); color: #fff; }
.cfinal strong { font: 500 1.2rem/1.3 var(--font-display); }
.cfinal p { margin: 4px 0 0; color: var(--muted); font-size: .92rem; }
.ctrainer-head { display: flex; gap: 16px; align-items: center; margin-bottom: 16px; }
.ctrainer-head .avatar { width: 64px; height: 64px; }
.ctrainer-head div { display: flex; flex-direction: column; gap: 2px; }
.ctrainer-name { font: 500 1.35rem/1.2 var(--font-display); }
.ctrainer .label { margin-bottom: 18px; }
.site .small { font-size: .85rem; }
.ccert .feature-icon { margin-bottom: 14px; }
.cmobile-cta { position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 70; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 10px 10px 18px; border-radius: 999px; background: rgba(25, 21, 43, .92); border: 1px solid var(--line-2); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); box-shadow: 0 20px 40px -12px rgba(0, 0, 0, .6); }
.cmobile-cta div { display: flex; flex-direction: column; line-height: 1.2; }
.cmobile-cta strong { font: 600 1rem/1.2 var(--font-tech); }
.cmobile-cta .dim { font-size: .78rem; }
@media (min-width: 1100px) { .cmobile-cta { display: none; } }
@media (max-width: 1099px) { body.is-learning .ftr { padding-bottom: 80px; } }

/* ==========================================================================
   2. DASHBOARD (light)
   ========================================================================== */
.mycourses { display: grid; gap: 16px; }
.mycourse { display: grid; grid-template-columns: 260px minmax(0, 1fr); overflow: hidden; }
.mycourse-media { position: relative; display: block; background: var(--ink); min-height: 150px; }
.mycourse-media > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.mycourse-body { padding: 20px 22px; display: flex; flex-direction: column; gap: 10px; }
.mycourse-title { margin: 0; font: 600 1.3rem/1.25 var(--font-display); }
.mycourse-title a { color: var(--text); }
.mycourse-title a:hover { color: var(--crimson); }
.mycourse-progress { display: flex; align-items: center; gap: 12px; }
.mycourse-progress .progress { flex: 1; }
.mycourse-progress strong { font: 600 14px var(--font-tech); min-width: 44px; text-align: right; }
@media (max-width: 760px) { .mycourse { grid-template-columns: 1fr; } .mycourse-media { aspect-ratio: 16 / 7; min-height: 0; } }
.mysuggest { display: block; color: var(--text); overflow: hidden; transition: transform .2s, box-shadow .2s; }
.mysuggest:hover { transform: translateY(-3px); box-shadow: var(--shadow); color: var(--text); }
.mysuggest-media { position: relative; aspect-ratio: 16 / 9; background: var(--ink); }
.mysuggest-media > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.mysuggest h3 { font-size: 1.02rem; }

/* certificates */
.certs { display: grid; gap: 18px; }
.cert { display: grid; grid-template-columns: 300px minmax(0, 1fr); overflow: hidden; }
.cert-visual { position: relative; display: flex; flex-direction: column; justify-content: center; gap: 6px; padding: 26px 24px; text-align: center; color: var(--ink);
  background: radial-gradient(90% 70% at 0% 0%, rgba(229, 0, 74, .1), transparent 60%), radial-gradient(90% 70% at 100% 100%, rgba(11, 122, 52, .12), transparent 60%), #FCFAF6;
  border-right: 1px solid var(--line); box-shadow: inset 0 0 0 10px #FCFAF6, inset 0 0 0 11px #C9A227; }
.cert-ribbon { margin: 0 auto 6px; width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; background: var(--ink); color: #E2C25A; box-shadow: 0 0 0 3px #FCFAF6, 0 0 0 4px #C9A227; }
.cert-k { font: 500 10.5px var(--font-tech); letter-spacing: .18em; text-transform: uppercase; color: #8C6D0A; }
.cert-name { font: 600 1.35rem/1.2 var(--font-display); }
.cert-course { font-size: 12.5px; color: var(--crimson); font-weight: 600; }
.cert-body { padding: 20px 22px; }
.cert-title { font: 600 1.2rem/1.3 var(--font-display); margin: 10px 0 12px; }
.kv.cert-kv { grid-template-columns: 90px 1fr; align-items: center; }
.kv.cert-kv dd { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; }
.cert.is-revoked .cert-visual { filter: grayscale(1); opacity: .6; }
@media (max-width: 760px) { .cert { grid-template-columns: 1fr; } .cert-visual { border-right: 0; border-bottom: 1px solid var(--line); } }

/* dashboard grids: let grid items shrink below their min-content (long nowrap titles) */
.grid > *, .grid-sidebar > * { min-width: 0; }

/* trainer */
.tr-welcome h1 { font-size: 1.8rem; }
.tr-kicker { font: 500 11px var(--font-tech); letter-spacing: .14em; text-transform: uppercase; color: #E2C25A !important; margin: 0 0 6px; }
.tr-welcome .btn-outline { background: rgba(255, 255, 255, .08); color: #fff; border-color: rgba(255, 255, 255, .25); }
.tr-courselist { display: grid; grid-template-columns: minmax(0, 1fr); }
.cert-kv code { font-size: 13px; padding: 4px 8px; }
.cert-kv .link-btn { display: inline-flex; align-items: center; gap: 4px; }
.cert-kv .link-btn .icon { width: 14px; height: 14px; }
.tr-courserow { display: flex; align-items: center; gap: 14px; padding: 12px 22px; border-bottom: 1px solid var(--line); }
.tr-courserow:last-child { border-bottom: 0; }
.tr-thumb { position: relative; width: 96px; aspect-ratio: 16 / 9; flex: none; border-radius: 10px; overflow: hidden; background: var(--ink); }
.tr-thumb.sm { width: 72px; }
.tr-thumb > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.tr-thumb .lc-fallback img { width: 30%; }
.tr-cr-main { flex: 1; min-width: 0; }
.tr-cr-title { display: block; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tr-cr-meta { display: flex; align-items: center; gap: 12px; margin-top: 4px; font-size: 13px; color: var(--text-3); }
.tr-cr-meta span { display: inline-flex; align-items: center; gap: 4px; }
.tr-cr-meta .icon { width: 14px; height: 14px; }
.tr-cr-actions { display: flex; gap: 2px; }
.tr-list { list-style: none; margin: 0; padding: 0; }
.tr-list li { padding: 11px 22px; border-bottom: 1px solid var(--line); }
.tr-list li:last-child { border-bottom: 0; }
.tr-list a { display: flex; flex-direction: column; color: var(--text); }
.tr-spark { display: flex; align-items: flex-end; gap: 8px; height: 120px; }
.tr-spark-col { flex: 1; height: 100%; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; gap: 6px; }
.tr-spark-col span { width: 100%; border-radius: 6px 6px 2px 2px; background: linear-gradient(180deg, var(--crimson), #FF8AA8); min-height: 4px; }
.tr-spark-col small { font: 500 10px var(--font-tech); color: var(--text-3); }
.tr-cards .tr-card { display: flex; flex-direction: column; overflow: hidden; }
.tr-card-media { position: relative; display: block; aspect-ratio: 16 / 9; background: var(--ink); }
.tr-card-media > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.tr-card-status { position: absolute; left: 12px; top: 12px; }
.tr-card-status .badge { box-shadow: var(--shadow); }
.tr-card .card-body { flex: 1; }
.tr-card-title { font: 600 1.12rem/1.3 var(--font-display); margin: 0 0 6px; }
.tr-card-title a { color: var(--text); }
.tr-card-stats { display: flex; gap: 14px; font-size: 13px; color: var(--text-2); }
.tr-card-stats span { display: inline-flex; gap: 6px; align-items: center; }
.tr-card-stats .icon { width: 15px; height: 15px; }
.tr-sticky { position: sticky; top: calc(var(--topbar-h) + 16px); }
@media (max-width: 1100px) { .tr-sticky { position: static; } }
.tr-switches { display: grid; gap: 14px; padding-top: 6px; }
.tr-switches .switch, .stack-sm .switch { align-items: flex-start; }
.switch span { display: flex; flex-direction: column; }
.switch small { color: var(--text-3); font-size: 12.5px; }
.tr-cover { position: relative; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: var(--surface-2); border: 1px solid var(--line); }
.tr-cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.tr-cover-empty { position: absolute; inset: 0; display: grid; place-items: center; color: var(--text-3); }
.tr-checklist .card-body { padding: 14px 22px; gap: 18px; }
.tr-chk { display: inline-flex; gap: 6px; align-items: center; font-size: 13px; color: var(--danger); }
.tr-chk.ok { color: var(--success); }
.tr-chk .icon { width: 16px; height: 16px; }
.tabs a .icon { width: 15px; height: 15px; vertical-align: -3px; }
.tr-types .choice-box { display: flex; flex-direction: column; gap: 6px; }
.tr-types .cb-type { margin-bottom: 4px; }
.tr-video { position: relative; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: #000; }
.tr-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.tr-file { display: flex; gap: 8px; align-items: center; padding: 10px 12px; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--line); margin-bottom: 8px; font-size: 14px; }
.tr-code { display: block; padding: 10px 12px; font-size: 11.5px; line-height: 1.5; word-break: break-all; white-space: normal; border: 1px solid var(--line); }
.tr-exam.is-final { border-color: rgba(229, 0, 74, .35); box-shadow: 0 0 0 3px rgba(229, 0, 74, .06); }
.tr-exam-facts { list-style: none; margin: 14px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.tr-exam-facts li { display: flex; flex-direction: column; padding: 10px 12px; border-radius: 10px; background: var(--surface-2); font-size: 12px; color: var(--text-2); }
.tr-exam-facts b { font: 600 1.15rem/1.2 var(--font-tech); color: var(--text); }
.hide-sm { }
@media (max-width: 640px) { .hide-sm { display: none; } .tr-exam-facts { grid-template-columns: repeat(2, 1fr); } }

/* curriculum builder */
.cb { display: grid; gap: 16px; }
.cb-mod { overflow: hidden; transition: box-shadow .2s, opacity .2s; }
.cb-mod.is-dragging { opacity: .5; box-shadow: 0 0 0 2px var(--crimson); }
.cb-mod-head { display: flex; align-items: center; gap: 12px; padding: 14px 18px; background: var(--surface-2); border-bottom: 1px solid var(--line); }
.cb-mod-n { font: 600 13px var(--font-tech); color: var(--crimson); }
.cb-mod-t { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.cb-mod-t strong { font-size: 15.5px; }
.cb-mod-actions { display: flex; gap: 2px; }
.cb-handle { cursor: grab; color: var(--text-3); display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; flex: none; }
.cb-handle:hover { background: var(--line); color: var(--text); }
.cb-lessons { list-style: none; margin: 0; padding: 8px; min-height: 52px; }
.cb-lesson { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 10px; background: var(--surface); border: 1px solid transparent; cursor: grab; transition: background .15s, border-color .15s; }
.cb-lesson:hover { background: var(--surface-2); border-color: var(--line); }
.cb-lesson.is-dragging { opacity: .5; border: 1px dashed var(--crimson); }
.cb-lesson-t { flex: 1; min-width: 0; font-weight: 500; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cb-tags { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.cb-lesson-actions { display: flex; }
.cb-empty { padding: 14px; text-align: center; color: var(--text-3); font-size: 13px; border: 1.5px dashed var(--line-2); border-radius: 10px; }
.cb-add { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 12px 18px; border-top: 1px solid var(--line); }
.cb-type { width: 32px; height: 32px; flex: none; border-radius: 9px; display: grid; place-items: center; }
.cb-type .icon { width: 16px; height: 16px; }
.cb-type-text { background: var(--blue-50); color: var(--blue); }
.cb-type-video { background: var(--crimson-50); color: var(--crimson); }
.cb-type-pdf { background: var(--gold-50); color: #8C6D0A; }
.cb-type-quiz { background: var(--green-50); color: var(--green); }
@media (max-width: 640px) { .cb-tags .badge:not(.badge-warning) { display: none; } .cb-add .btn { flex: 1 1 40%; } }

/* exam builder */
.qbank { list-style: none; margin: 0; padding: 0; }
.qitem { border-bottom: 1px solid var(--line); }
.qitem:last-child { border-bottom: 0; }
.qitem-row { display: flex; gap: 14px; align-items: flex-start; padding: 14px 22px; }
.qitem-n { width: 28px; height: 28px; flex: none; border-radius: 50%; display: grid; place-items: center; background: var(--ink); color: #fff; font: 600 12px var(--font-tech); }
.qitem-main { flex: 1; min-width: 0; }
.qitem-prompt { margin: 2px 0 6px; font-weight: 500; }
.qitem-meta { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.qitem-meta .icon { width: 14px; height: 14px; vertical-align: -2px; color: var(--success); }
.qitem-actions { display: flex; }
.qitem-edit { padding: 4px 22px 22px 64px; background: var(--surface-2); border-top: 1px dashed var(--line); }
@media (max-width: 640px) { .qitem-edit { padding: 4px 14px 18px; } }
.qopts { display: grid; gap: 8px; }
.qopt { display: grid; grid-template-columns: 44px 1fr 1fr; gap: 8px; align-items: center; }
@media (max-width: 640px) { .qopt { grid-template-columns: 44px 1fr; } .qopt .input:last-child { grid-column: 2; } }
.qopt-c { position: relative; cursor: pointer; }
.qopt-c input { position: absolute; opacity: 0; }
.qopt-c span { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 10px; border: 1.5px solid var(--line-2); font: 600 14px var(--font-tech); color: var(--text-2); background: var(--surface); transition: all .15s; }
.qopt-c input:checked + span { background: var(--green); border-color: var(--green); color: #fff; box-shadow: 0 0 0 3px rgba(11, 122, 52, .15); }
.qopt-c input:focus-visible + span { outline: 2px solid var(--crimson); outline-offset: 2px; }

/* grading */
.gq summary { cursor: pointer; list-style: none; }
.gq summary::-webkit-details-marker { display: none; }
.gq-open { border-color: rgba(183, 121, 31, .35); }
.gq-prompt { font-weight: 500; }
.gq-answer { padding: 14px 16px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); margin-bottom: 14px; }
.gq-answer small { font: 500 11px var(--font-tech); letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); }
.gq-answer p { margin: 6px 0 0; white-space: pre-wrap; }
.gq-points { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.gq-points label { font-weight: 500; font-size: 14px; }
.gq-points .input { width: 90px; }
.gq-quick { display: flex; gap: 4px; flex-wrap: wrap; }

/* ==========================================================================
   3. FOCUSED PLAYER (layout learning/layout.php)
   ========================================================================== */
.lp-body { background: #F7F5FB; --lp-top: 62px; --lp-side: 330px; --lp-tutor: 380px; }
.lp-top { position: sticky; top: 0; z-index: 60; height: var(--lp-top); display: flex; align-items: center; gap: 14px; padding: 0 18px; background: var(--ink); color: #fff; box-shadow: 0 1px 0 rgba(255, 255, 255, .06); }
.lp-top::after { content: ''; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: linear-gradient(90deg, var(--crimson), var(--blue) 50%, var(--green)); opacity: .9; }
.lp-brand img { width: 34px; height: auto; }
.lp-course { flex: 1; min-width: 0; display: flex; align-items: center; gap: 22px; }
.lp-course-title { color: #fff; font: 600 15px/1.2 var(--font-display); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 46ch; }
.lp-course-title:hover { color: #FFC2D4; }
.lp-progress { display: flex; align-items: center; gap: 10px; width: 220px; flex: none; color: #CFCBE0; font: 600 12.5px var(--font-tech); }
.lp-progress .lbar { background: rgba(255, 255, 255, .14); }
.lp-progress .lbar > i { background: linear-gradient(90deg, var(--green), #46C474); }
.lp-actions { display: flex; align-items: center; gap: 8px; }
.lp-lang, .lp-exit { display: inline-flex; align-items: center; gap: 8px; height: 38px; padding: 0 12px; border-radius: 10px; color: #CFCBE0; font: 500 13px var(--font); border: 1px solid rgba(255, 255, 255, .14); }
.lp-lang { font-family: var(--font-tech); font-weight: 600; }
.lp-lang:hover, .lp-exit:hover { color: #fff; background: rgba(255, 255, 255, .08); }
.lp-avatar { width: 34px; height: 34px; border-radius: 50%; overflow: hidden; display: grid; place-items: center; font: 600 12px var(--font-tech); background: linear-gradient(135deg, var(--crimson), #8A1A6B); color: #fff; }
.lp-avatar img { width: 100%; height: 100%; object-fit: cover; }
.lp-icon { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 10px; border: 0; background: transparent; color: inherit; cursor: pointer; }
.lp-icon:hover { background: rgba(127, 120, 160, .16); }
.lp-menu { display: none; }
.lp-main { outline: none; }

.lp { display: grid; grid-template-columns: var(--lp-side) minmax(0, 1fr); min-height: calc(100vh - var(--lp-top)); }
.lp.tutor-open { grid-template-columns: var(--lp-side) minmax(0, 1fr) var(--lp-tutor); }
.lp-side { position: sticky; top: var(--lp-top); height: calc(100vh - var(--lp-top)); display: flex; flex-direction: column; background: #fff; border-right: 1px solid var(--line); z-index: 40; }
.lp-side-head { position: relative; padding: 20px 22px 16px; border-bottom: 1px solid var(--line); }
.lp-side-k { margin: 0; font: 600 11px var(--font-tech); letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); }
.lp-side-n { margin: 4px 0 10px; font: 500 14px var(--font); }
.lp-side-close { display: none; position: absolute; right: 12px; top: 12px; }
.lp-toc { flex: 1; overflow-y: auto; padding: 8px 10px 30px; overscroll-behavior: contain; }
.lp-mod + .lp-mod { margin-top: 6px; }
.lp-mod-t { display: flex; gap: 10px; align-items: baseline; margin: 14px 12px 6px; font: 600 13px/1.35 var(--font); color: var(--text); }
.lp-mod-t span { font: 600 11px var(--font-tech); color: var(--crimson); }
.lp-mod ol { list-style: none; margin: 0; padding: 0; }
.lp-mod li > a, .lp-mod li > span, .lp-final { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 10px; color: var(--text-2); font-size: 13.5px; line-height: 1.35; }
.lp-mod li > a:hover, .lp-final:hover { background: var(--surface-2); color: var(--text); }
.lp-mod li.is-current > a { background: var(--crimson-50); color: var(--text); font-weight: 600; box-shadow: inset 3px 0 0 var(--crimson); }
.lp-mod li > span.is-locked { opacity: .55; }
.lp-check { width: 24px; height: 24px; flex: none; border-radius: 50%; display: grid; place-items: center; border: 1.5px solid var(--line-2); color: var(--text-3); background: #fff; }
.lp-check .icon { width: 12px; height: 12px; }
.lp-mod li.is-done .lp-check, .lp-final.is-done .lp-check { background: var(--green); border-color: var(--green); color: #fff; }
.lp-mod li.is-current .lp-check { border-color: var(--crimson); color: var(--crimson); }
.lp-mod li.is-current.is-done .lp-check { color: #fff; }
.lp-l-t { flex: 1; min-width: 0; }
.lp-l-d { font: 500 11px var(--font-tech); color: var(--text-3); }
.lp-lock { width: 14px; height: 14px; color: var(--text-3); }
.lp-final { margin-top: 8px; border: 1px dashed rgba(229, 0, 74, .4); font-weight: 600; color: var(--text); }
.lp-final .lp-check { border-color: var(--crimson); color: var(--crimson); }
.lp-scrim { display: none; }

.lp-stage { min-width: 0; padding: clamp(24px, 4vw, 56px) clamp(16px, 4vw, 56px) 90px; }
.lp-article { max-width: 820px; margin: 0 auto; }
.lp-kicker { display: flex; align-items: center; gap: 8px; margin: 0 0 12px; font: 500 12.5px var(--font-tech); color: var(--text-3); letter-spacing: .02em; }
.lp-kicker .icon { width: 15px; height: 15px; color: var(--crimson); }
.lp-title { font: 600 clamp(1.8rem, 3.6vw, 2.6rem)/1.15 var(--font-display); letter-spacing: -.01em; margin: 0 0 26px; }
.lp-head .alert { margin-bottom: 20px; }
.lp-video { position: relative; aspect-ratio: 16 / 9; border-radius: 18px; overflow: hidden; background: var(--ink); margin-bottom: 30px; box-shadow: 0 30px 60px -30px rgba(18, 15, 31, .5); }
.lp-video iframe, .lp-video video { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: #000; }
.lp-video-empty { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 10px; text-align: center; padding: 24px; color: #CFCBE0;
  background: radial-gradient(70% 90% at 100% 0%, rgba(229, 0, 74, .45), transparent 60%), radial-gradient(60% 90% at 0% 100%, rgba(31, 63, 184, .45), transparent 60%), var(--ink); }
.lp-video-empty .icon-lg { width: 46px; height: 46px; color: #fff; }
.lp-video-empty p { margin: 0; max-width: 40ch; }
.lp-pdf { border-radius: 16px; overflow: hidden; border: 1px solid var(--line); background: #fff; margin-bottom: 30px; box-shadow: var(--shadow); }
.lp-pdf object { display: block; width: 100%; height: min(78vh, 900px); background: #EDEBF3; }
.lp-pdf-fallback { height: 100%; display: grid; place-content: center; justify-items: center; gap: 8px; color: var(--text-2); padding: 30px; text-align: center; }
.lp-pdf-bar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 12px 16px; border-top: 1px solid var(--line); }
.lp-pdf-bar > span { flex: 1; display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-2); min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* lesson typography */
.lp-prose { font-size: 17px; line-height: 1.8; color: #2A2640; }
.lp-prose > * + * { margin-top: 1.05em; }
.lp-prose p { margin: 0; }
.lp-prose > * + *, .lp-prose > p + p { margin-top: 1.05em; }
.lp-prose h2 { font: 600 1.55rem/1.25 var(--font-display); margin: 1.9em 0 .2em; color: var(--text); }
.lp-prose h3 { font: 600 1.12rem/1.35 var(--font); margin: 1.6em 0 .1em; color: var(--text); }
.lp-prose h4 { font: 600 1rem/1.4 var(--font); margin: 1.3em 0 0; }
.lp-prose ul, .lp-prose ol { padding-left: 1.4em; }
.lp-prose li + li { margin-top: .45em; }
.lp-prose li::marker { color: var(--crimson); font-weight: 600; }
.lp-prose strong { color: var(--text); font-weight: 600; }
.lp-prose a { color: var(--crimson); text-decoration: underline; text-underline-offset: 3px; }
.lp-prose blockquote { margin: 1.6em 0; padding: 18px 22px; border-left: 3px solid var(--crimson); background: #fff; border-radius: 0 14px 14px 0; font: 500 1.12rem/1.6 var(--font-display); color: var(--text); box-shadow: var(--shadow-sm); }
.lp-prose img { border-radius: 14px; margin: 1.4em auto; }
.lp-prose figure { margin: 1.4em 0; }
.lp-prose figcaption { font-size: 13px; color: var(--text-3); text-align: center; margin-top: 6px; }
.lp-prose code { background: #EEEBF6; color: #4A2A8A; padding: .12em .4em; border-radius: 6px; font-size: .88em; }
.lp-prose pre { background: var(--ink); color: #E8E4F4; padding: 18px 20px; border-radius: 14px; overflow-x: auto; font-size: 14px; line-height: 1.6; }
.lp-prose pre code { background: none; color: inherit; padding: 0; }
.lp-prose table { width: 100%; border-collapse: collapse; font-size: 15px; background: #fff; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-sm); display: block; overflow-x: auto; }
.lp-prose th, .lp-prose td { padding: 11px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.lp-prose th { background: var(--ink); color: #fff; font-weight: 500; font-size: 14px; }
.lp-prose hr { border: 0; height: 1px; background: var(--line-2); margin: 2.2em 0; }
.lp-prose .callout, .lp-prose p.callout { padding: 16px 20px 16px 52px; border-radius: 14px; background: #fff; border: 1px solid var(--line); position: relative; box-shadow: var(--shadow-sm); }
.lp-prose .callout::before { content: '✦'; position: absolute; left: 20px; top: 15px; color: var(--crimson); font-size: 18px; }
.lp-prose .callout-green { border-color: #CBEAD6; background: var(--green-50); }
.lp-prose .callout-green::before { color: var(--green); }
.lp-prose .callout-gold { border-color: #F2E3B3; background: var(--gold-50); }
.lp-prose .callout-gold::before { color: #8C6D0A; }
.lp-prose .lead-in { font: 500 1.2rem/1.6 var(--font-display); color: var(--text); }

/* quiz / exam card in lesson */
.lx-card { margin-top: 30px; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.lx-card.is-final { border-color: rgba(229, 0, 74, .3); background: linear-gradient(160deg, #FFF5F8, #fff 45%); }
.lx-head { display: flex; gap: 14px; align-items: center; margin-bottom: 12px; }
.lx-head h3 { margin: 0; font: 600 1.3rem/1.25 var(--font-display); }
.lx-ic { width: 48px; height: 48px; flex: none; border-radius: 14px; display: grid; place-items: center; background: var(--green-50); color: var(--green); }
.lx-card.is-final .lx-ic, .lp-cert .lx-ic { background: var(--ink); color: #E2C25A; }
.lx-kind { margin: 0; font: 600 11px var(--font-tech); letter-spacing: .14em; text-transform: uppercase; color: var(--crimson); }
.lx-facts { list-style: none; margin: 14px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 18px; font-size: 14px; color: var(--text-2); }
.lx-facts li { display: flex; gap: 8px; align-items: center; }
.lx-facts .icon { width: 16px; height: 16px; color: var(--text-3); }
.lx-best { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 16px; padding: 12px 14px; border-radius: 12px; font-size: 14px; }
.lx-best.ok { background: var(--success-bg); color: #075a26; }
.lx-best.ko { background: var(--warning-bg); color: #8A5A10; }
.lx-best a { margin-left: auto; font-weight: 600; color: inherit; text-decoration: underline; }
.lp-final-block { margin-top: 44px; padding-top: 30px; border-top: 1px solid var(--line-2); }
.lp-final-block h2 { font: 600 1.5rem/1.2 var(--font-display); margin: 0 0 6px; }
.lp-cert { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 30px; padding: 20px 22px; border-radius: 18px; background: linear-gradient(120deg, var(--green-50), #fff); border: 1px solid #CBEAD6; }
.lp-cert > div { flex: 1; min-width: 200px; }

.lp-foot { margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line); }
.lp-nav { display: grid; grid-template-columns: 1fr auto 1fr; gap: 14px; align-items: center; }
.lp-nav > a:first-child { justify-self: start; }
.lp-nav .lp-next { justify-self: end; text-align: right; }
.lp-nav .btn-ghost { white-space: normal; max-width: 260px; padding: 10px 12px; }
.lp-nav-t { display: flex; flex-direction: column; font-size: 13.5px; line-height: 1.3; color: var(--text); }
.lp-nav-t small { font: 600 10.5px var(--font-tech); letter-spacing: .12em; text-transform: uppercase; color: var(--text-3); }
.lp-done-btn { box-shadow: 0 12px 26px -12px rgba(11, 122, 52, .7); }
.lp-hint { display: inline-flex; gap: 8px; align-items: center; font-size: 13.5px; color: var(--text-2); text-align: center; }

/* AI tutor */
.tutor { position: sticky; top: var(--lp-top); height: calc(100vh - var(--lp-top)); display: none; flex-direction: column; background: #fff; border-left: 1px solid var(--line); z-index: 45; }
.lp.tutor-open .tutor { display: flex; }
.tutor-head { display: flex; gap: 12px; align-items: center; padding: 14px 14px 14px 18px; border-bottom: 1px solid var(--line); background: linear-gradient(120deg, #1D1930, var(--ink)); color: #fff; }
.tutor-head > div { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.tutor-head strong { font: 600 15px var(--font-display); }
.tutor-head span { font-size: 12px; color: #BDB6D3; }
.tutor-avatar { width: 38px; height: 38px; flex: none; border-radius: 12px; display: grid; place-items: center; color: #fff; background: conic-gradient(from 200deg, var(--crimson), var(--blue), var(--green), var(--crimson)); box-shadow: 0 0 0 3px rgba(255, 255, 255, .08); }
.tutor-head .lp-icon { color: #CFCBE0; }
.tutor-log { flex: 1; overflow-y: auto; padding: 18px 16px; display: flex; flex-direction: column; gap: 12px; background: #FAF9FD; overscroll-behavior: contain; }
.tmsg { max-width: 92%; padding: 11px 14px; border-radius: 16px; font-size: 14px; line-height: 1.6; }
.tmsg p { margin: 0; }
.tmsg p + p, .tmsg p + ul, .tmsg ul + p, .tmsg p + ol, .tmsg ol + p { margin-top: 8px; }
.tmsg ul, .tmsg ol { margin: 0; padding-left: 1.2em; }
.tmsg li + li { margin-top: 3px; }
.tmsg pre { background: var(--ink); color: #eee; padding: 10px; border-radius: 10px; overflow-x: auto; font-size: 12.5px; margin: 8px 0 0; }
.tmsg code { font-size: .88em; }
.tmsg-ai { align-self: flex-start; background: #fff; border: 1px solid var(--line); border-bottom-left-radius: 6px; box-shadow: var(--shadow-sm); }
.tmsg-me { align-self: flex-end; background: var(--ink); color: #fff; border-bottom-right-radius: 6px; }
.tmsg.is-error { background: var(--warning-bg); border-color: #F5E0B5; color: #8A5A10; }
.dots { display: inline-flex; gap: 3px; margin-right: 4px; vertical-align: middle; }
.dots i { width: 6px; height: 6px; border-radius: 50%; background: var(--crimson); animation: tdot 1s infinite ease-in-out; }
.dots i:nth-child(2) { animation-delay: .15s; background: var(--blue); }
.dots i:nth-child(3) { animation-delay: .3s; background: var(--green); }
@keyframes tdot { 0%, 80%, 100% { transform: scale(.5); opacity: .5; } 40% { transform: scale(1); opacity: 1; } }
.tmsg.is-typing { color: var(--text-3); }
.tutor-suggest { display: flex; flex-wrap: wrap; gap: 6px; padding: 10px 14px 0; background: #fff; border-top: 1px solid var(--line); }
.tutor-suggest button { border: 1px solid var(--line-2); background: #fff; border-radius: 999px; padding: 6px 12px; font: 500 12.5px var(--font); color: var(--text-2); cursor: pointer; }
.tutor-suggest button:hover { border-color: var(--crimson); color: var(--crimson); }
.tutor-form { display: flex; gap: 8px; align-items: flex-end; padding: 12px 14px 4px; background: #fff; }
.tutor-suggest[hidden] + .tutor-form { border-top: 1px solid var(--line); }
.tutor-form textarea { flex: 1; resize: none; min-height: 44px; max-height: 140px; padding: 11px 14px; border-radius: 14px; border: 1px solid var(--line-2); font: 400 14px/1.45 var(--font); color: var(--text); background: var(--surface-2); }
.tutor-form textarea:focus { outline: none; border-color: var(--crimson); background: #fff; box-shadow: 0 0 0 4px rgba(229, 0, 74, .1); }
.tutor-send { width: 44px; height: 44px; flex: none; border-radius: 14px; border: 0; background: var(--crimson); color: #fff; display: grid; place-items: center; cursor: pointer; box-shadow: 0 8px 20px -10px rgba(229, 0, 74, .9); }
.tutor-send:hover { background: var(--crimson-600); }
.tutor.is-busy .tutor-send { opacity: .5; pointer-events: none; }
.tutor-note { margin: 0; padding: 4px 16px 12px; font-size: 11px; color: var(--text-3); background: #fff; }
.tutor.is-off .tutor-log { justify-content: flex-start; }
.tutor-fab { position: fixed; right: 20px; bottom: 20px; z-index: 50; display: inline-flex; align-items: center; gap: 10px; height: 52px; padding: 0 20px 0 16px; border-radius: 999px; border: 0; cursor: pointer; color: #fff; font: 600 14px var(--font);
  background: linear-gradient(120deg, var(--crimson), #8A1A6B); box-shadow: 0 18px 40px -14px rgba(229, 0, 74, .8); transition: transform .2s; }
.tutor-fab:hover { transform: translateY(-2px); }
.lp.tutor-open .tutor-fab, .lp.side-open .tutor-fab { display: none; }

/* player responsive */
@media (max-width: 1279px) {
  .lp.tutor-open { grid-template-columns: var(--lp-side) minmax(0, 1fr); }
  .lp.tutor-open .tutor { position: fixed; right: 0; top: var(--lp-top); bottom: 0; height: auto; width: min(420px, 100%); box-shadow: -30px 0 60px -20px rgba(18, 15, 31, .35); }
}
@media (max-width: 1024px) {
  .lp, .lp.tutor-open { grid-template-columns: minmax(0, 1fr); }
  .lp-menu { display: grid; }
  .lp-side { position: fixed; left: 0; top: var(--lp-top); bottom: 0; height: auto; width: min(360px, 88vw); transform: translateX(-102%); transition: transform .3s cubic-bezier(.22, 1, .36, 1); box-shadow: 30px 0 60px -20px rgba(18, 15, 31, .35); }
  .lp.side-open .lp-side { transform: none; }
  .lp-side-close { display: grid; }
  .lp.side-open .lp-scrim { display: block; position: fixed; inset: var(--lp-top) 0 0 0; background: rgba(18, 15, 31, .45); z-index: 39; }
  .lp-progress { width: 150px; }
}
@media (max-width: 720px) {
  .lp-top { gap: 8px; padding: 0 10px; }
  .lp-brand { display: none; }
  .lp-course { flex-direction: column; align-items: stretch; gap: 5px; }
  .lp-course-title { font-size: 13.5px; }
  .lp-progress { width: 100%; font-size: 11px; }
  .lp-progress .lbar { height: 4px; }
  .lp-exit span { display: none; }
  .lp-exit { padding: 0 9px; }
  .lp-avatar { display: none; }
  .lp-stage { padding: 22px 16px 110px; }
  .lp-title { font-size: 1.65rem; margin-bottom: 20px; }
  .lp-prose { font-size: 16px; line-height: 1.75; }
  .lp-video { border-radius: 12px; margin-left: -16px; margin-right: -16px; border-radius: 0; }
  .lp-nav { grid-template-columns: 1fr 1fr; }
  .lp-nav form, .lp-nav .lp-hint { grid-column: 1 / -1; order: -1; }
  .lp-nav form .btn { width: 100%; }
  .lp-nav .btn-ghost { max-width: none; }
  .lp-nav-t { font-size: 12.5px; }
  .lx-facts { grid-template-columns: 1fr; }
  .lx-card { padding: 18px; }
  .tutor-fab { right: 14px; bottom: 14px; height: 48px; padding: 0 16px 0 14px; }
  .lp.tutor-open .tutor { width: 100%; }
  .lp-pdf object { height: 65vh; }
}

/* exam taking */
.ex-bar { position: sticky; top: var(--lp-top); z-index: 50; background: rgba(247, 245, 251, .92); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.ex-bar-in { max-width: 1180px; margin: 0 auto; display: flex; align-items: center; gap: 16px; padding: 12px 20px; }
.ex-quit { display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px; color: var(--text-2); }
.ex-bar-title { flex: 1; min-width: 0; display: flex; flex-direction: column; text-align: center; }
.ex-bar-title strong { font: 600 15px var(--font-display); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ex-bar-right { display: flex; align-items: center; gap: 14px; }
.ex-saved { font: 500 12px var(--font-tech); color: var(--text-3); white-space: nowrap; }
.ex-saved.ok::before { content: '● '; color: var(--green); }
.ex-saved.ko { color: var(--warning); }
.ex-timer { display: inline-flex; align-items: center; gap: 8px; height: 40px; padding: 0 14px; border-radius: 12px; background: var(--ink); color: #fff; font: 600 17px var(--font-tech); letter-spacing: .04em; font-variant-numeric: tabular-nums; }
.ex-timer.is-warn { background: #B7791F; }
.ex-timer.is-danger { background: var(--danger); animation: tpulse 1s infinite; }
@keyframes tpulse { 50% { box-shadow: 0 0 0 6px rgba(212, 24, 61, .2); } }
.ex-progress { height: 3px; background: var(--line); }
.ex-progress span { display: block; height: 100%; background: linear-gradient(90deg, var(--crimson), var(--green)); transition: width .4s; }
.ex-wrap { max-width: 1180px; margin: 0 auto; padding: 30px 20px 100px; display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 30px; align-items: start; }
.ex-main { display: grid; gap: 18px; }
.ex-instr { display: flex; gap: 12px; padding: 16px 18px; border-radius: 14px; background: var(--info-bg); color: #19338F; font-size: 14.5px; }
.ex-instr p { margin: 0; }
.exq { margin: 0; padding: 24px; border-radius: 18px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm); scroll-margin-top: calc(var(--lp-top) + 90px); min-width: 0; }
.exq-head { display: flex; align-items: center; gap: 12px; padding: 0; margin: 0 0 12px; font-weight: 400; float: none; width: 100%; }
.exq-n { width: 32px; height: 32px; flex: none; border-radius: 50%; display: grid; place-items: center; background: var(--ink); color: #fff; font: 600 13px var(--font-tech); }
.exq-meta { font: 500 12px var(--font-tech); color: var(--text-3); letter-spacing: .04em; text-transform: uppercase; }
.exq-prompt { font: 500 1.12rem/1.55 var(--font); color: var(--text); margin: 0 0 16px; }
.exq-hint { margin: -8px 0 12px; font-size: 13px; color: var(--crimson); font-weight: 500; }
.exq-opts { display: grid; gap: 10px; }
.exq-opts.is-tf { grid-template-columns: 1fr 1fr; }
.exo { display: block; cursor: pointer; position: relative; }
.exo input { position: absolute; opacity: 0; pointer-events: none; }
.exo-box { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: 14px; border: 1.5px solid var(--line-2); background: #fff; transition: border-color .15s, background .15s, box-shadow .15s; }
.exo:hover .exo-box { border-color: var(--text-3); }
.exo-letter { width: 32px; height: 32px; flex: none; border-radius: 10px; display: grid; place-items: center; background: var(--surface-2); border: 1px solid var(--line-2); font: 600 13px var(--font-tech); color: var(--text-2); transition: all .15s; }
.exo-letter .icon { width: 15px; height: 15px; }
.exo-t { font-size: 15px; line-height: 1.5; }
.exo input:checked + .exo-box { border-color: var(--crimson); background: var(--crimson-50); box-shadow: 0 0 0 3px rgba(229, 0, 74, .1); }
.exo input:checked + .exo-box .exo-letter { background: var(--crimson); border-color: var(--crimson); color: #fff; }
.exo input:focus-visible + .exo-box { outline: 2px solid var(--crimson); outline-offset: 2px; }
.exq-open { min-height: 150px; font-size: 15px; }
.ex-submit { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; padding: 20px 24px; border-radius: 18px; background: var(--ink); color: #fff; }
.ex-submit .muted { color: #CFCBE0; margin: 0; }
.ex-nav { position: sticky; top: calc(var(--lp-top) + 90px); }
.ex-nav-in { padding: 18px; border-radius: 18px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.ex-nav-t { margin: 0 0 12px; font: 600 11px var(--font-tech); letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); }
.ex-dots { list-style: none; margin: 0 0 14px; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.ex-dots a { display: grid; place-items: center; aspect-ratio: 1; border-radius: 10px; border: 1.5px solid var(--line-2); font: 600 13px var(--font-tech); color: var(--text-2); background: #fff; }
.ex-dots a.is-answered { background: var(--green); border-color: var(--green); color: #fff; }
.ex-dots a.is-current { box-shadow: 0 0 0 3px rgba(229, 0, 74, .3); border-color: var(--crimson); }
.ex-legend { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; font-size: 12px; color: var(--text-3); margin: 0 0 14px; }
.ex-legend .d { width: 12px; height: 12px; border-radius: 4px; border: 1.5px solid var(--line-2); display: inline-block; margin-left: 4px; }
.ex-legend .d.is-answered { background: var(--green); border-color: var(--green); }
@media (max-width: 900px) {
  .ex-wrap { grid-template-columns: 1fr; padding: 18px 14px 120px; }
  .ex-nav { position: fixed; left: 0; right: 0; bottom: 0; top: auto; z-index: 55; }
  .ex-nav-in { border-radius: 18px 18px 0 0; padding: 10px 12px calc(10px + env(safe-area-inset-bottom)); display: flex; align-items: center; gap: 10px; box-shadow: 0 -10px 30px -12px rgba(18, 15, 31, .25); }
  .ex-nav-t, .ex-legend { display: none; }
  .ex-dots { flex: 1; display: flex; overflow-x: auto; margin: 0; gap: 6px; scrollbar-width: none; }
  .ex-dots::-webkit-scrollbar { display: none; }
  .ex-dots a { width: 36px; height: 36px; aspect-ratio: auto; }
  .ex-nav .btn-block { width: auto; flex: none; }
  .ex-bar-in { padding: 10px 14px; gap: 10px; }
  .ex-quit span, .ex-bar-title .lx-kind { display: none; }
  .ex-bar-title { text-align: left; }
  .ex-saved { display: none; }
  .exq { padding: 18px; }
  .exq-opts.is-tf { grid-template-columns: 1fr; }
  .ex-submit { display: none; }
}

/* result */
.rs { max-width: 900px; margin: 0 auto; padding: clamp(24px, 4vw, 48px) 18px 90px; }
.rs-hero { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 34px; align-items: center; padding: 32px; border-radius: 24px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); position: relative; overflow: hidden; }
.rs-hero::before { content: ''; position: absolute; inset: 0; pointer-events: none; opacity: .9; }
.rs-hero.is-pass::before { background: radial-gradient(60% 80% at 0% 0%, rgba(11, 122, 52, .12), transparent 60%), radial-gradient(50% 80% at 100% 100%, rgba(201, 162, 39, .12), transparent 60%); }
.rs-hero.is-fail::before { background: radial-gradient(60% 80% at 0% 0%, rgba(229, 0, 74, .1), transparent 60%); }
.rs-hero.is-pending::before { background: radial-gradient(60% 80% at 0% 0%, rgba(31, 63, 184, .1), transparent 60%); }
.rs-hero > * { position: relative; }
.rs-ring { position: relative; width: 200px; height: 200px; }
.rs-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.rs-track { fill: none; stroke: var(--line); stroke-width: 14; }
.rs-val { fill: none; stroke-width: 14; stroke-linecap: round; stroke: var(--crimson); transition: stroke-dasharray 1s; }
.is-pass .rs-val { stroke: var(--green); }
.rs-num { position: absolute; inset: 0; display: grid; place-items: center; font: 600 2.1rem/1 var(--font-tech); letter-spacing: -.02em; color: var(--text); }
.rs-num .icon-lg { width: 46px; height: 46px; color: var(--blue); }
.rs-copy h1 { font: 600 clamp(1.6rem, 3.4vw, 2.3rem)/1.15 var(--font-display); margin: 6px 0 8px; text-wrap: balance; }
.rs-sub { color: var(--text-2); margin: 0 0 16px; }
.rs-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.rs-actions form { display: contents; }
.rs-note { display: flex; gap: 8px; align-items: center; margin: 14px 0 0; font-size: 14px; color: var(--text-2); }
.rs-feedback { display: flex; gap: 12px; padding: 14px 16px; border-radius: 14px; background: var(--info-bg); color: #19338F; margin-bottom: 16px; }
.rs-feedback p { margin: 4px 0 0; }
.rs-history { margin-top: 26px; }
.rs-history h2, .rs-review h2 { font: 600 1.3rem var(--font-display); margin: 0 0 12px; }
.rs-history ol { list-style: none; margin: 0; padding: 0; display: flex; gap: 8px; flex-wrap: wrap; }
.rs-history a { display: inline-flex; align-items: center; gap: 10px; padding: 8px 14px; border-radius: 12px; background: #fff; border: 1px solid var(--line); color: var(--text); font-size: 13px; }
.rs-history .is-current a { border-color: var(--crimson); box-shadow: 0 0 0 3px rgba(229, 0, 74, .1); }
.rs-history span { color: var(--text-3); }
.rs-review { margin-top: 34px; display: grid; gap: 14px; }
.rq { padding: 20px 22px; border-radius: 18px; background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--line-2); }
.rq.is-ok { border-left-color: var(--green); }
.rq.is-ko { border-left-color: var(--danger); }
.rq.is-partial { border-left-color: var(--warning); }
.rq-head { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.rq-state { display: inline-flex; align-items: center; gap: 6px; font: 600 13px var(--font); }
.is-ok .rq-state { color: var(--green); }
.is-ko .rq-state { color: var(--danger); }
.is-partial .rq-state { color: var(--warning); }
.rq-pts { margin-left: auto; font: 600 13px var(--font-tech); color: var(--text-2); }
.rq-opts { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.rq-opts li { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 12px; border: 1px solid var(--line); font-size: 14.5px; }
.rq-opts li.is-correct { border-color: #9ED7B2; background: var(--green-50); }
.rq-opts li.is-wrong { border-color: #F7C9D3; background: var(--danger-bg); }
.rq-opts li em { margin-left: auto; font: 500 11px var(--font-tech); text-transform: uppercase; letter-spacing: .08em; color: var(--text-3); font-style: normal; }
.rq-opts .rq-c { color: var(--green); margin-left: 4px; }
.rq-opts li:not(.is-given) .rq-c { margin-left: auto; }
.rq-opts li.is-correct .exo-letter { background: var(--green); border-color: var(--green); color: #fff; }
.rq-opts li.is-wrong .exo-letter { background: var(--danger); border-color: var(--danger); color: #fff; }
.rq-open { padding: 12px 14px; border-radius: 12px; background: var(--surface-2); }
.rq-open small { font: 500 11px var(--font-tech); letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); }
.rq-open p { margin: 4px 0 0; white-space: pre-wrap; }
.rq-expl { display: flex; gap: 10px; margin-top: 12px; padding: 12px 14px; border-radius: 12px; background: var(--info-bg); color: #19338F; font-size: 14px; }
.rq-expl p { margin: 0; }
.rs-hidden { display: flex; gap: 8px; align-items: center; justify-content: center; margin-top: 26px; color: var(--text-3); }
@media (max-width: 720px) {
  .rs-hero { grid-template-columns: 1fr; justify-items: center; text-align: center; padding: 26px 20px; gap: 18px; }
  .rs-ring { width: 160px; height: 160px; }
  .rs-actions { justify-content: center; }
  .rs-actions .btn { width: 100%; }
  .rs-feedback { text-align: left; }
}
@media print { .lp-top, .lp-side, .tutor, .tutor-fab, .lp-foot { display: none !important; } .lp { display: block; } }

/* small-screen refinements for dashboard tools */
@media (max-width: 640px) {
  .tr-courserow { padding: 12px 14px; gap: 10px; flex-wrap: wrap; }
  .tr-thumb { width: 72px; }
  .tr-cr-main { flex: 1 1 calc(100% - 90px); }
  .tr-cr-title { white-space: normal; }
  .tr-cr-actions { width: 100%; justify-content: flex-end; border-top: 1px dashed var(--line); padding-top: 6px; }
  .tr-welcome h1 { font-size: 1.5rem; }
  .cb-mod-head { padding: 12px; gap: 8px; }
  .cb-lesson { flex-wrap: wrap; row-gap: 4px; }
  .cb-lesson-t { flex: 1 1 0; min-width: 0; white-space: normal; }
  .cb-tags { order: 5; width: 100%; justify-content: flex-start; padding-left: 80px; }
  .cb-lesson-actions .btn { padding: 6px 8px; }
  .cb-mod-head .cb-mod-t strong { font-size: 14.5px; }
  .kv.cert-kv { grid-template-columns: 1fr; }
  .qitem-row { padding: 12px 14px; gap: 10px; }
}