.gradivo-body {
  --gradivo-main-nav-height: 72px;
  --gradivo-subnav-height: 62px;
  background: #e0dfdc;
  color: #332c1d;
}

.gradivo-body .navbar {
  background-color: #e0dfdc;
}

.gradivo-body .logo {
  display: block;
  width: auto;
  height: 4vh;
}

.gradivo-main {
  padding: calc(var(--gradivo-main-nav-height) + var(--gradivo-subnav-height) + 46px) 0 70px;
}

.gradivo-main > .container {
  max-width: min(1480px, calc(100vw - 32px));
}

.gradivo-nav {
  position: fixed;
  top: var(--gradivo-main-nav-height);
  left: 0;
  right: 0;
  z-index: 1020;
  background: rgba(224,223,220,.98);
  border-bottom: 1px solid rgba(0,0,0,.08);
  transition: transform 220ms ease, box-shadow 220ms ease, background-color 220ms ease;
  will-change: transform;
  transform: translateY(0);
}

.hide-header.is-hidden ~ .gradivo-nav {
  transform: translateY(calc(-1 * (var(--gradivo-main-nav-height) + var(--gradivo-subnav-height))));
}

/* no separate shadow when scrolled — main nav shadow covers the whole header block */

.gradivo-nav-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: var(--gradivo-subnav-height);
}

.gradivo-nav-home,
.gradivo-nav a {
  color: #332c1d;
  text-decoration: none;
}

.gradivo-nav-home {
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

/* ── desktop nav: razina gumbi u traci ── */
.gradivo-nav-levels {
  display: none; /* prikazano samo na desktopu */
  align-items: center;
  gap: 2px;
}

.gradivo-nav-level-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #332c1d;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: background 120ms;
}

.gradivo-nav-level-btn:hover,
.gradivo-nav-level-btn:focus-visible {
  background: rgba(51,44,29,.08);
  outline: none;
}

.gradivo-nav-level-btn[aria-expanded="true"] {
  background: rgba(51,44,29,.10);
}

.gradivo-nav-level-btn i {
  font-size: .8rem;
  transition: transform 180ms ease;
}

.gradivo-nav-level-btn[aria-expanded="true"] i {
  transform: rotate(180deg);
}

/* ── mobile toggle button ── */
.gradivo-nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  border: 0;
  background: transparent;
  color: #332c1d;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  min-height: 44px;
  padding: 0 2px;
}

/* ── mega-panel ── */
.gradivo-panel {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #e0dfdc;
  border-top: 1px solid rgba(0,0,0,.06);
  border-bottom: 1px solid rgba(0,0,0,.08);
  box-shadow: 0 8px 32px rgba(0,0,0,.10);
  z-index: 1010;
}

.gradivo-panel.is-open {
  display: block;
}

/* mobile sticky header */
.gradivo-panel__header {
  display: none;
  align-items: center;
  gap: 4px;
  padding: 0 12px;
  min-height: 48px;
  border-bottom: 1px solid rgba(0,0,0,.08);
  background: rgba(224,223,220,.98);
  position: sticky;
  top: 0;
  z-index: 1;
}

.gradivo-panel__title {
  flex: 1;
  font-weight: 800;
  font-size: .82rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: #332c1d;
  text-align: center;
}

.gradivo-panel__back,
.gradivo-panel__close {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 44px;
  min-width: 44px;
  padding: 0 4px;
  border: 0;
  background: transparent;
  color: #332c1d;
  font: inherit;
  font-weight: 700;
  font-size: .85rem;
  cursor: pointer;
}

/* panel body — 3 columns */
.gradivo-panel__body {
  display: flex;
  overflow: hidden;
}

.gradivo-panel__col {
  overflow-y: auto;
}

.gradivo-panel__levels {
  flex: 0 0 180px;
  background: #cccbc7;
  border-right: 1px solid rgba(0,0,0,.07);
}

.gradivo-panel__subjects {
  flex: 0 0 210px;
  background: #d8d7d3;
  border-right: 1px solid rgba(0,0,0,.07);
}

.gradivo-panel__details {
  flex: 1;
  background: #e8e7e3;
}

/* hide empty cols on desktop */
@media (min-width: 992px) {
  .gradivo-panel__subjects:not(.has-content),
  .gradivo-panel__details:not(.has-content) {
    display: none;
  }

  .gradivo-panel__body {
    max-height: min(500px, calc(100vh - var(--gradivo-main-nav-height) - var(--gradivo-subnav-height) - 40px));
  }

  .gradivo-panel__col {
    max-height: inherit;
  }
}

/* column section heading */
.gp-col-heading {
  padding: 12px 14px 4px;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .10em;
  text-transform: uppercase;
  color: rgba(51,44,29,.48);
}

.gp-list {
  list-style: none;
  margin: 0;
  padding: 6px 0;
}

/* shared panel item (button or link) */
.gp-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 44px;
  padding: 8px 14px;
  border: 0;
  background: transparent;
  color: #332c1d;
  font: inherit;
  font-size: .875rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  text-align: left;
  transition: background 120ms;
}

.gp-item:hover,
.gp-item:focus-visible {
  background: rgba(51,44,29,.08);
  outline: none;
}

.gp-item[aria-selected="true"] {
  background: rgba(51,44,29,.13);
  border-left: 3px solid #f2a93b;
  padding-left: 11px;
  font-weight: 800;
}

.gp-item--all {
  font-style: italic;
  font-weight: 600;
  color: rgba(51,44,29,.70);
}

/* grade accordion */
.gp-grade-list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
}

.gp-grade-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 38px;
  padding: 6px 14px;
  border: 0;
  background: transparent;
  color: rgba(51,44,29,.60);
  font: inherit;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .07em;
  text-transform: uppercase;
  cursor: pointer;
  text-align: left;
  transition: background 120ms, color 120ms;
}

.gp-grade-btn:hover,
.gp-grade-btn:focus-visible {
  background: rgba(51,44,29,.07);
  color: #332c1d;
  outline: none;
}

.gp-grade-btn[aria-expanded="true"] {
  color: #332c1d;
}

.gp-grade-btn i {
  transition: transform 180ms ease;
  font-size: .72rem;
}

.gp-grade-btn[aria-expanded="true"] i {
  transform: rotate(90deg);
}

.gp-topics {
  display: none;
  padding-bottom: 4px;
}

.gp-topics.is-open {
  display: block;
}

/* statična razredna oznaka (kad predmet ima samo jedan razred) */
.gp-grade-label {
  padding: 8px 14px 3px;
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(51,44,29,.50);
}

/* topic links */
.gp-topic-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.gp-topic-link {
  display: flex;
  align-items: center;
  min-height: 36px;
  padding: 5px 14px 5px 24px;
  color: #332c1d;
  text-decoration: none;
  font: 600 .84rem/1.3 system-ui, sans-serif;
  transition: background 120ms;
}

.gp-topic-link:hover,
.gp-topic-link:focus-visible {
  background: rgba(51,44,29,.08);
  outline: none;
}

.gradivo-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  font-family: system-ui, sans-serif;
  font-size: .9rem;
}

.gradivo-breadcrumb li:not(:last-child)::after {
  content: ">";
  margin-left: 8px;
  color: rgba(51,44,29,.45);
}

.gradivo-breadcrumb a {
  color: #332c1d;
  text-decoration: none;
}

.gradivo-hero,
.gradivo-page {
  padding: 46px 0;
}

.gradivo-page-narrow {
  max-width: 760px;
}

.gradivo-kicker {
  margin: 0 0 10px;
  color: #f2a93b;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.gradivo-hero h1,
.gradivo-page h1 {
  max-width: 1280px;
  margin: 0 0 18px;
  font-size: clamp(3rem, 9vw, 7.8rem);
  font-weight: 900;
  line-height: .95;
  color: #ffbd59;
  letter-spacing: -1px;
}

.gradivo-hero p,
.gradivo-lead {
  max-width: 760px;
  font: 700 clamp(1.05rem, 2vw, 1.45rem)/1.35 system-ui, sans-serif;
}

.gradivo-lesson-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 920px;
  margin: 20px 0 6px;
}

.gradivo-lesson-nav-link {
  display: flex;
  min-height: 72px;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  padding: 14px 16px;
  color: #332c1d;
  background: #f3f3f3;
  border: 1px solid rgba(51,44,29,.12);
  border-radius: 8px;
  text-decoration: none;
}

.gradivo-lesson-nav-link-next {
  grid-column: 2;
  text-align: right;
}

.gradivo-lesson-nav-link:only-child {
  grid-column: span 1;
}

.gradivo-lesson-nav-link span {
  color: rgba(51,44,29,.62);
  font: 800 .78rem/1.2 system-ui, sans-serif;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.gradivo-lesson-nav-link strong {
  font: 900 1rem/1.25 system-ui, sans-serif;
}

.gradivo-lesson-nav-link:hover {
  border-color: rgba(242,169,59,.75);
  box-shadow: 0 8px 24px rgba(0,0,0,.06);
}

.gradivo-section {
  padding: 34px 0;
}

.gradivo-section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.gradivo-section-heading h2,
.gradivo-section-title,
.gradivo-placeholder h2,
.gradivo-cta h2 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.55rem);
  font-weight: 900;
}

.gradivo-section-heading a {
  color: #332c1d;
  font-weight: 900;
}

.gradivo-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.gradivo-card {
  display: flex;
  min-height: 180px;
  flex-direction: column;
  justify-content: flex-start;
  gap: 12px;
  padding: 26px 22px;
  background: #f3f3f3;
  color: #332c1d;
  text-decoration: none;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,.06);
}

.gradivo-card i {
  color: #f2a93b;
  font-size: 2rem;
}

.gradivo-card span,
.gradivo-topic-row span {
  font-size: 1.2rem;
  font-weight: 900;
}

.gradivo-card p {
  margin: 0;
  font: 500 .96rem/1.45 system-ui, sans-serif;
  color: rgba(51,44,29,.72);
}

.gradivo-topic-list {
  display: grid;
  gap: 10px;
  max-width: 860px;
  margin-top: 28px;
}

.gradivo-topic-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  color: #332c1d;
  background: #fff;
  border-radius: 8px;
  text-decoration: none;
}

.gradivo-content,
.gradivo-placeholder,
.gradivo-cta {
  max-width: 1180px;
  margin-top: 34px;
  padding: 28px;
  background: #f3f3f3;
  border-radius: 8px;
}

.gradivo-content {
  font: 500 1.05rem/1.7 system-ui, sans-serif;
}

.gradivo-content h2:not(.gradivo-section-title) {
  margin: 26px 0 10px;
  font-size: clamp(1.18rem, 1.8vw, 1.55rem);
  font-weight: 900;
  line-height: 1.2;
}

.gradivo-content h3 {
  margin: 22px 0 8px;
  font-size: clamp(1.05rem, 1.4vw, 1.3rem);
  font-weight: 850;
  line-height: 1.25;
}

.gradivo-content .gradivo-section-title {
  margin-bottom: 18px;
}

.gradivo-intro {
  font-weight: 700;
  border-left: 6px solid #f2a93b;
}

.gradivo-interactive-frame {
  display: block;
  width: 100%;
  height: 100px;
  border: 0;
  border-radius: 8px;
  background: #f3f3f3;
}

.gradivo-quiz-frame {
  display: block;
  width: 100%;
  height: 100px;
  border: 0;
  background: #f3f3f3;
  margin-top: 16px;
}

.gradivo-exercise-toggle {
  display: flex;
  margin: 0 0 18px;
}

.gradivo-exercise-toggle label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 10px 14px;
  background: #fff;
  border: 1px solid rgba(51,44,29,.14);
  border-radius: 8px;
  cursor: pointer;
  font: 850 .98rem/1.25 system-ui, sans-serif;
}

.gradivo-exercise-toggle input {
  width: 18px;
  height: 18px;
  accent-color: #f2a93b;
}

.gradivo-topic-exercises .gradivo-exercise-solution {
  display: none;
}

.gradivo-topic-exercises.is-showing-solutions .gradivo-exercise-solution {
  display: inline;
}

.gradivo-topic-exercises .gradivo-exercise-list li {
  margin-bottom: .55em;
}

.gradivo-topic-exercises.is-showing-solutions .gradivo-exercise-solution {
  color: rgba(51,44,29,.78);
}


.gradivo-placeholder {
  color: rgba(51,44,29,.72);
}

.gradivo-cta {
  background: #332c1d;
  color: #fff;
}

.gradivo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 24px;
  color: #332c1d;
  background: #f2a93b;
  border-radius: 999px;
  font-weight: 900;
  text-decoration: none;
}

.gradivo-empty {
  font: 600 1rem/1.5 system-ui, sans-serif;
  color: rgba(51,44,29,.72);
}

.gradivo-admin-table-wrap {
  overflow-x: auto;
  background: #fff;
  border-radius: 8px;
}

.gradivo-admin-table {
  width: 100%;
  border-collapse: collapse;
  font-family: system-ui, sans-serif;
}

.gradivo-admin-table th,
.gradivo-admin-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(0,0,0,.08);
  text-align: left;
  white-space: nowrap;
}

/* ────────────────────────────────────────────────
   Topic page — H1 manji nego na hero stranicama
   ──────────────────────────────────────────────── */
.gradivo-topic h1 {
  font-size: clamp(1.75rem, 4vw, 3rem);
  line-height: 1.1;
  letter-spacing: -.03em;
}

/* ────────────────────────────────────────────────
   Scroll offset za anchor linkove (kompenzira
   sve tri sticky trake iznad sadržaja)
   ──────────────────────────────────────────────── */
#objasnjenje,
#interaktivno,
#zadaci,
#provjeri {
  scroll-margin-top: calc(var(--gradivo-main-nav-height) + var(--gradivo-subnav-height) + 55px);
}

/* ────────────────────────────────────────────────
   Sticky section nav
   ──────────────────────────────────────────────── */
.gradivo-section-nav {
  position: sticky;
  top: calc(var(--gradivo-main-nav-height) + var(--gradivo-subnav-height));
  z-index: 100;
  margin: 14px 0 0;
  padding: 8px 0;
  background: #e0dfdc;
  border-bottom: 1px solid rgba(51,44,29,.1);
}

.gradivo-section-nav-scroll {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.gradivo-section-nav-scroll::-webkit-scrollbar {
  display: none;
}

.gradivo-section-nav-link {
  flex-shrink: 0;
  padding: 7px 14px;
  border-radius: 999px;
  font: 800 .88rem/1.2 system-ui, sans-serif;
  color: #332c1d;
  text-decoration: none;
  white-space: nowrap;
  transition: background 150ms, color 150ms;
}

.gradivo-section-nav-link:hover,
.gradivo-section-nav-link.is-active {
  background: #332c1d;
  color: #ffbd59;
}

/* ────────────────────────────────────────────────
   iframe wrapper + skeleton loading
   ──────────────────────────────────────────────── */
.gradivo-iframe-wrapper {
  position: relative;
  min-height: 320px;
  margin-top: 16px;
  border-radius: 8px;
  overflow: hidden;
  background: #f3f3f3;
}

.gradivo-iframe-wrapper--quiz {
  min-height: 220px;
}

.gradivo-iframe-skeleton {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(51,44,29,.06) 25%,
    rgba(51,44,29,.13) 50%,
    rgba(51,44,29,.06) 75%
  );
  background-size: 200% 100%;
  animation: gradivo-skeleton 1.4s ease infinite;
  pointer-events: none;
}

@keyframes gradivo-skeleton {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.gradivo-iframe-wrapper .gradivo-interactive-frame,
.gradivo-iframe-wrapper .gradivo-quiz-frame {
  position: relative;
  z-index: 1;
  margin-top: 0;
  border-radius: 0;
  background: transparent;
}

/* ────────────────────────────────────────────────
   Solutions button (zamjena checkboxa)
   ──────────────────────────────────────────────── */
.gradivo-solutions-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  background: #fff;
  border: 1px solid rgba(51,44,29,.16);
  border-radius: 8px;
  font: 850 .98rem/1.25 system-ui, sans-serif;
  color: #332c1d;
  cursor: pointer;
  transition: background 150ms, border-color 150ms;
}

.gradivo-solutions-btn:hover {
  border-color: rgba(242,169,59,.65);
  background: #fef6e6;
}

.gradivo-solutions-btn[aria-pressed="true"] {
  background: #f2a93b;
  border-color: #f2a93b;
}

/* ────────────────────────────────────────────────
   Coming soon note (diskretna poruka)
   ──────────────────────────────────────────────── */
.gradivo-coming-soon-note {
  margin-top: 28px;
  padding: 14px 18px;
  background: rgba(51,44,29,.05);
  border-radius: 8px;
  font: 500 .92rem/1.5 system-ui, sans-serif;
  color: rgba(51,44,29,.6);
}

/* ────────────────────────────────────────────────
   Hover stanja — kartice i redovi
   ──────────────────────────────────────────────── */
.gradivo-card {
  transition: box-shadow 180ms ease, transform 180ms ease;
}

.gradivo-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(51,44,29,.12);
}

.gradivo-topic-row {
  transition: background 150ms ease, box-shadow 150ms ease;
  box-shadow: 0 2px 8px rgba(51,44,29,.04);
}

.gradivo-topic-row:hover {
  background: #f9f8f5;
  box-shadow: 0 4px 14px rgba(51,44,29,.08);
}

/* ────────────────────────────────────────────────
   Focus visible (keyboard navigacija)
   ──────────────────────────────────────────────── */
.gradivo-body :focus-visible {
  outline: 2px solid #f2a93b;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ────────────────────────────────────────────────
   prefers-reduced-motion
   ──────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .gradivo-iframe-skeleton {
    animation: none;
  }

  .gradivo-card,
  .gradivo-topic-row,
  .gradivo-btn,
  .gradivo-section-nav-link,
  .gradivo-solutions-btn,
  .gradivo-lesson-nav-link {
    transition: none;
  }
}

@media (min-width: 992px) {
  /* na desktopu: razina gumbi vidljivi, toggle skriven */
  .gradivo-nav-levels {
    display: flex;
  }

  .gradivo-nav-toggle {
    display: none;
  }
}

/* mobile: full-height drawer + drill-down steps */
@media (max-width: 991.98px) {
  .gradivo-panel {
    position: fixed;
    top: calc(var(--gradivo-main-nav-height) + var(--gradivo-subnav-height));
    left: 0;
    right: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 1030;
    border-bottom: 0;
    box-shadow: none;
  }

  .gradivo-panel.is-open {
    display: flex;
    flex-direction: column;
  }

  .gradivo-panel__header {
    display: flex;
  }

  .gradivo-panel__body {
    flex: 1;
    flex-direction: column;
    overflow-y: auto;
  }

  .gradivo-panel__col {
    flex: none;
    width: 100%;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid rgba(0,0,0,.06);
    background: #e0dfdc;
  }

  /* drill-down: show only current step */
  .gradivo-panel__body[data-step] .gradivo-panel__col {
    display: none;
  }

  .gradivo-panel__body[data-step="levels"]   .gradivo-panel__levels,
  .gradivo-panel__body[data-step="subjects"] .gradivo-panel__subjects,
  .gradivo-panel__body[data-step="details"]  .gradivo-panel__details {
    display: block;
  }

  .gp-item {
    min-height: 52px;
    padding: 12px 16px;
    font-size: .95rem;
  }

  .gp-item[aria-selected="true"] {
    padding-left: 13px;
  }

  .gp-grade-btn {
    min-height: 48px;
    padding: 12px 16px;
    font-size: .8rem;
  }

  .gp-topic-link {
    min-height: 46px;
    padding: 10px 16px 10px 30px;
    font-size: .9rem;
  }
}

@media (max-width: 575.98px) {
  .gradivo-body {
    --gradivo-main-nav-height: 58px;
    --gradivo-subnav-height: 56px;
  }

  .gradivo-body .logo {
    height: 26px;
  }

  .gradivo-section-heading {
    display: block;
  }

  .gradivo-lesson-nav {
    grid-template-columns: 1fr;
  }

  .gradivo-lesson-nav-link-next {
    grid-column: auto;
    text-align: left;
  }

  .gradivo-content,
  .gradivo-placeholder,
  .gradivo-cta {
    padding: 20px;
  }

  .gradivo-topic h1 {
    font-size: clamp(1.5rem, 7vw, 2.2rem);
  }

  .gradivo-iframe-wrapper {
    min-height: 240px;
    border-radius: 6px;
  }

  .gradivo-card-grid {
    grid-template-columns: 1fr;
  }

}