/* =============================================
   UDESK — Lab Pages CSS
   ============================================= */

@font-face {
  font-family: "Montserrat";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/montserrat-v23-latin_cyrillic-regular.eot");
  src: local(""),
    url("../fonts/montserrat-v23-latin_cyrillic-regular.eot?#iefix") format("embedded-opentype"),
    url("../fonts/montserrat-v23-latin_cyrillic-regular.woff2") format("woff2"),
    url("../fonts/montserrat-v23-latin_cyrillic-regular.woff") format("woff"),
    url("../fonts/montserrat-v23-latin_cyrillic-regular.ttf") format("truetype"),
    url("../fonts/montserrat-v23-latin_cyrillic-regular.svg#Montserrat") format("svg");
}

@font-face {
  font-family: "Montserrat";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/montserrat-v23-latin_cyrillic-600.eot");
  src: local(""),
    url("../fonts/montserrat-v23-latin_cyrillic-600.eot?#iefix") format("embedded-opentype"),
    url("../fonts/montserrat-v23-latin_cyrillic-600.woff2") format("woff2"),
    url("../fonts/montserrat-v23-latin_cyrillic-600.woff") format("woff"),
    url("../fonts/montserrat-v23-latin_cyrillic-600.ttf") format("truetype"),
    url("../fonts/montserrat-v23-latin_cyrillic-600.svg#Montserrat") format("svg");
}

/* ── Variables ── */
:root {
  --clr-primary:  #1e3a5f;
  --clr-accent:   #4f8ef7;
  --clr-purple:   #7c3aed;
  --clr-success:  #10b981;
  --clr-bg-dark:  #0f172a;
  --clr-text:     #1e293b;
  --clr-muted:    #64748b;
  --clr-border:   #e2e8f0;
  --clr-bg:       #f8fafc;
  --nav-h:        64px;
  --radius:       12px;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:    0 4px 12px rgba(0,0,0,.10);
}

/* ── Base ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--clr-text);
  background: var(--clr-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Navbar ── */
.lab-nav {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: var(--clr-bg-dark);
  height: var(--nav-h);
  box-shadow: 0 2px 12px rgba(0,0,0,.35);
}

.lab-nav .container {
  display: flex;
  align-items: center;
  height: 100%;
  gap: .75rem;
}

.lab-nav__back {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  color: #94a3b8;
  text-decoration: none;
  font-size: .82rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color .2s;
}
.lab-nav__back:hover { color: var(--clr-accent); }
.lab-nav__back i { font-size: 1.1rem; }

.lab-nav__divider {
  width: 1px;
  height: 24px;
  background: #1e293b;
  flex-shrink: 0;
}

.lab-nav__title {
  flex: 1;
  color: #94a3b8;
  font-size: .78rem;
  font-weight: 600;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 .5rem;
}

.lab-nav__lang {
  display: flex;
  align-items: center;
  gap: .3rem;
  flex-shrink: 0;
  font-size: .8rem;
  font-weight: 700;
}
.lab-nav__lang a {
  color: #475569;
  text-decoration: none;
  padding: .2rem .45rem;
  border-radius: 5px;
  transition: all .2s;
}
.lab-nav__lang a.active,
.lab-nav__lang a:hover {
  color: var(--clr-accent);
  background: rgba(79,142,247,.12);
}
.lab-nav__lang span { color: #334155; }

/* ── Lab Header ── */
.lab-header {
  background: linear-gradient(135deg, var(--clr-bg-dark) 0%, #1e1b4b 55%, #1e3a5f 100%);
  padding: 2.25rem 0 2rem;
  position: relative;
  overflow: hidden;
}

.lab-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%234f8ef7' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.lab-header .container { position: relative; z-index: 1; }

.lab-badges {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin-bottom: .9rem;
}

.lab-badge {
  display: inline-flex;
  align-items: center;
  gap: .28rem;
  padding: .28rem .72rem;
  border-radius: 50px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .02em;
}
.lab-badge i { font-size: .78rem; }

.lab-badge--class {
  background: rgba(79,142,247,.18);
  color: #93c5fd;
  border: 1px solid rgba(79,142,247,.3);
}
.lab-badge--num {
  background: rgba(124,58,237,.18);
  color: #c4b5fd;
  border: 1px solid rgba(124,58,237,.3);
}
.lab-badge--subject {
  background: rgba(16,185,129,.15);
  color: #6ee7b7;
  border: 1px solid rgba(16,185,129,.25);
}

.lab-header__title {
  color: #f1f5f9;
  font-size: clamp(1.1rem, 2.4vw, 1.55rem);
  font-weight: 700;
  line-height: 1.35;
  max-width: 780px;
  margin: 0;
}

/* ── Main layout ── */
.lab-main { min-height: calc(100vh - var(--nav-h) - 180px); }

/* ── Sticky sidebar ── */
.lab-sidebar-sticky {
  position: sticky;
  top: calc(var(--nav-h) + 1.25rem);
}

/* ── Generic Lab Card ── */
.lab-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  border: 1px solid var(--clr-border);
}

.lab-card__header {
  padding: .7rem 1rem;
  background: linear-gradient(90deg, var(--clr-primary), #253f6a);
  color: #fff;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
}

/* ── Video ── */
.video-wrapper {
  background: #000;
  line-height: 0;
}
.video-wrapper video {
  width: 100%;
  max-height: 210px;
  object-fit: contain;
  display: block;
}

/* ── Buy Card ── */
.lab-card--buy .lab-card__header {
  background: linear-gradient(90deg, #065f46, #047857);
}

.price-display {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--clr-primary);
  text-align: center;
  margin-bottom: .7rem;
  letter-spacing: -.02em;
}
.price-display span {
  font-size: .95rem;
  color: var(--clr-muted);
  font-weight: 600;
}

.btn-buy-full {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .68rem 1rem;
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-purple));
  color: #fff;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: .875rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: all .25s;
  margin-bottom: .5rem;
  width: 100%;
}
.btn-buy-full:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(79,142,247,.4);
  color: #fff;
}

.btn-lab-open {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .62rem 1rem;
  background: transparent;
  color: var(--clr-success);
  border: 2px solid var(--clr-success);
  border-radius: 8px;
  font-family: inherit;
  font-size: .85rem;
  font-weight: 700;
  text-decoration: none;
  transition: all .25s;
  width: 100%;
}
.btn-lab-open:hover {
  background: var(--clr-success);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(16,185,129,.35);
}

.buy-note {
  font-size: .7rem;
  color: var(--clr-muted);
  text-align: center;
  margin-top: .6rem;
  margin-bottom: 0;
}

/* ── Bundle Card ── */
.lab-bundle-card {
  background: linear-gradient(135deg, var(--clr-primary), #1e1b4b);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  border: 1px solid rgba(79,142,247,.2);
}
.lab-bundle-card__title {
  font-size: .72rem;
  color: #93c5fd;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: .5rem;
}
.lab-bundle-card__price {
  font-size: 1.3rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: .7rem;
  line-height: 1.3;
}
.lab-bundle-card__price small {
  font-size: .78rem;
  color: #64748b;
  font-weight: 400;
  text-decoration: line-through;
}

/* ── Prose Cards ── */
.lab-prose-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--clr-border);
  overflow: hidden;
}

.lab-prose-card__title {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .8rem 1.1rem;
  background: #f8fafc;
  border-bottom: 1px solid var(--clr-border);
  font-size: .88rem;
  font-weight: 700;
  color: var(--clr-primary);
}

.section-icon {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .88rem;
  flex-shrink: 0;
}

.lab-prose-card__body { padding: 1.1rem 1.25rem; }

.lab-prose-card__body p,
.lab-prose-card__body li {
  font-size: .875rem;
  line-height: 1.7;
  color: var(--clr-text);
}

.lab-prose-card__body p { margin: 0; }
.lab-prose-card__body p + p { margin-top: .6rem; }
.lab-prose-card__body b { color: var(--clr-primary); }

/* ── Lab image ── */
.lab-img-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  background: #fff;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lab-img-card img {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Equipment list ── */
ol.equipment-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: equip-counter;
}
.equipment-list li {
  display: flex;
  align-items: flex-start;
  gap: .65rem;
  font-size: .875rem;
  line-height: 1.55;
  padding: .5rem 0;
  border-bottom: 1px solid var(--clr-border);
  counter-increment: equip-counter;
}
.equipment-list li:last-child { border-bottom: none; }
.equipment-list li::before {
  content: counter(equip-counter);
  min-width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--clr-accent);
  color: #fff;
  font-size: .68rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: .12rem;
}

/* ── Procedure steps ── */
.procedure-step {
  padding: .875rem 1rem;
  background: #f8fafc;
  border-radius: 8px;
  border-left: 3px solid var(--clr-purple);
  margin-bottom: .6rem;
}
.procedure-step:last-child { margin-bottom: 0; }

.procedure-step__label {
  font-size: .72rem;
  font-weight: 700;
  color: var(--clr-purple);
  text-transform: uppercase;
  letter-spacing: .07em;
  margin-bottom: .3rem;
}
.procedure-step__text {
  font-size: .875rem;
  line-height: 1.65;
  color: var(--clr-text);
  margin: 0;
}

/* ── Self-test questions ── */
ol.question-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  counter-reset: question-counter;
}
.question-list li {
  display: flex;
  gap: .7rem;
  padding: .75rem 1rem;
  background: #f0f9ff;
  border-radius: 8px;
  border-left: 3px solid var(--clr-accent);
  font-size: .875rem;
  line-height: 1.55;
  counter-increment: question-counter;
}
.question-list li::before {
  content: counter(question-counter);
  min-width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--clr-accent);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ── Download section ── */
.download-section {
  background: linear-gradient(135deg, #064e3b, #065f46);
  border-radius: var(--radius);
  padding: 1.4rem;
  text-align: center;
  color: #fff;
  border: 1px solid rgba(16,185,129,.2);
}
.download-section h5 {
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: .4rem;
}
.download-section p {
  font-size: .82rem;
  color: #a7f3d0;
  margin-bottom: .9rem;
}
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .6rem 1.4rem;
  background: #fff;
  color: #065f46;
  border-radius: 8px;
  font-weight: 700;
  font-size: .875rem;
  text-decoration: none;
  transition: all .2s;
}
.btn-download:hover {
  background: #ecfdf5;
  color: #064e3b;
  transform: translateY(-1px);
}

/* ── Payment Modal ── */
.payment-modal-product {
  background: #f8fafc;
  border-radius: 8px;
  padding: .8rem 1rem;
  margin-bottom: .9rem;
  border: 1px solid var(--clr-border);
}
.payment-modal-product__label {
  font-size: .68rem;
  font-weight: 700;
  color: var(--clr-muted);
  text-transform: uppercase;
  letter-spacing: .07em;
  margin-bottom: .2rem;
}
.payment-modal-product__name {
  font-size: .9rem;
  font-weight: 600;
  color: var(--clr-text);
  line-height: 1.4;
}

.payment-modal-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-primary);
  text-align: center;
  margin-bottom: .8rem;
}

.btn-click-pay, .btn-click,
.btn-payme-pay, .btn-payme {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1rem;
  border-radius: 10px;
  font-family: inherit;
  font-size: .9rem;
  font-weight: 700;
  width: 100%;
  text-decoration: none;
  margin-bottom: .6rem;
  cursor: pointer;
  transition: background .2s, transform .18s, box-shadow .18s;
}
.btn-click-pay, .btn-click {
  background: #0f6cc8;
  color: #fff;
  border: none;
}
.btn-payme-pay, .btn-payme {
  background: #0aa86a;
  color: #fff;
  border: none;
  margin-bottom: 0;
}
.btn-click-pay:hover, .btn-click:hover {
  background: #0d5caa;
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(15,108,200,.35);
}
.btn-payme-pay:hover, .btn-payme:hover {
  background: #089158;
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(10,168,106,.35);
}

/* ── Footer ── */
.lab-footer {
  background: var(--clr-bg-dark);
  color: #475569;
  text-align: center;
  padding: 1.4rem;
  font-size: .78rem;
  margin-top: 3rem;
}
.lab-footer a { color: var(--clr-accent); text-decoration: none; }
.lab-footer a:hover { text-decoration: underline; }

/* ── Subject Badge Variants ── */
.lab-badge--elektr {
  background: rgba(245,158,11,.15);
  color: #fcd34d;
  border: 1px solid rgba(245,158,11,.3);
}
.lab-badge--termo {
  background: rgba(239,68,68,.13);
  color: #fca5a5;
  border: 1px solid rgba(239,68,68,.25);
}
.lab-badge--optika {
  background: rgba(6,182,212,.14);
  color: #67e8f9;
  border: 1px solid rgba(6,182,212,.25);
}

/* ── Data Table ── */
.lab-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: .75rem 0 0;
  border-radius: 8px;
  border: 1px solid var(--clr-border);
}
.lab-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .76rem;
  min-width: 380px;
}
.lab-table th {
  background: linear-gradient(90deg, var(--clr-primary), #253f6a);
  color: #fff;
  padding: .48rem .55rem;
  text-align: center;
  font-weight: 700;
  white-space: nowrap;
  border: 1px solid rgba(255,255,255,.08);
}
.lab-table td {
  padding: .38rem .5rem;
  border: 1px solid var(--clr-border);
  vertical-align: middle;
  text-align: center;
  min-width: 52px;
  font-size: .76rem;
}
.lab-table td em { font-style: italic; color: var(--clr-muted); }
.lab-table tbody tr:nth-child(odd) { background: #f8fafc; }
.lab-table tbody tr:hover { background: #eff6ff; }

/* ── Inline images (inside prose content) ── */
.lab-inline-img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
  border: 1px solid var(--clr-border);
}

/* ── Formula highlight ── */
.lab-formula {
  text-align: center;
  font-weight: 700;
  color: var(--clr-primary);
  padding: .45rem 1rem;
  background: #f0f9ff;
  border-radius: 6px;
  border-left: 3px solid var(--clr-accent);
  margin: .5rem 0;
  font-size: .88rem;
}

/* ── Responsive ── */
@media (max-width: 991.98px) {
  .lab-header { padding: 1.75rem 0 1.5rem; }
  .lab-sidebar-sticky { position: static; }
  .lab-nav__title { display: none !important; }
}

@media (max-width: 575.98px) {
  .lab-header__title { font-size: 1.05rem; }
  .lab-nav { height: auto; min-height: var(--nav-h); }
  .lab-nav .container {
    flex-wrap: wrap;
    padding-top: .5rem;
    padding-bottom: .5rem;
    gap: .5rem;
  }
}