/* JEE Chapter Overview V2.1 — scoped pilot styles only */
.rbl-jee-chapter-v21 {
  --chapter-accent: #0c9e7d; /* overridden inline per subject */
  --v21-navy: #0f1b33;
  --v21-muted: #5b6679;
  --v21-border: #e3e7ee;
  --v21-orange: #c2410c;
  --v21-mint: color-mix(in srgb, var(--chapter-accent) 14%, #ffffff);
  --v21-white: #fff;
  --v21-shadow: 0 2px 9px rgba(15, 27, 51, 0.04);
  --v21-hero-desktop: url("/assets/ribblu/images/jee-chapter-overview-v21/hero-chemistry-desktop.svg");
  --v21-hero-mobile: url("/assets/ribblu/images/jee-chapter-overview-v21/hero-chemistry-mobile.svg");
  color: var(--v21-navy);
  /* Contain chapter UI so nowrap pills never widen the document */
  max-width: 100%;
  overflow-x: clip;
}

/* Match approved Category V1 wrap (1240 / 64px gutters); do not exceed V4/V1. */
.rbl-jee-chapter-v21 .rbl-jee-chapter-v21-shell {
  width: calc(100% - 64px);
  max-width: 1240px;
  margin-inline: auto;
  padding-bottom: 28px;
  min-width: 0;
  box-sizing: border-box;
}

.rbl-jee-chapter-v21 .rbl-jee-chapter-v21-breadcrumb {
  font-size: 12px;
  color: #4c5870;
  margin: 19px 0 13px;
}

.rbl-jee-chapter-v21 .rbl-jee-chapter-v21-breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.rbl-jee-chapter-v21 .rbl-jee-chapter-v21-breadcrumb a:hover {
  text-decoration: underline;
}

.rbl-jee-chapter-v21 .rbl-jee-chapter-v21-breadcrumb-sep {
  margin: 0 0.35em;
  opacity: 0.7;
}

.rbl-jee-chapter-v21 .chapter-hero {
  background-color: var(--v21-mint);
  background-image: var(--v21-hero-desktop);
  background-size: cover;
  background-position: center right;
  background-repeat: no-repeat;
  border-radius: 17px;
  padding: 22px 31px 20px;
  min-height: 186px;
  position: relative;
  overflow: hidden;
}

.rbl-jee-chapter-v21 .chapter-hero-eyebrow {
  font-size: 12px;
  font-weight: 700;
  color: color-mix(in srgb, var(--chapter-accent) 72%, #0f1b33);
  background: color-mix(in srgb, var(--chapter-accent) 22%, #ffffff);
  padding: 4px 11px;
  border-radius: 20px;
  display: inline-flex;
  align-items: center;
}

.rbl-jee-chapter-v21 .chapter-hero-title {
  font-size: 31px;
  letter-spacing: -0.7px;
  line-height: 1.14;
  margin: 11px 0 7px;
  max-width: 760px;
  font-weight: 760;
  color: var(--v21-navy);
}

.rbl-jee-chapter-v21 .chapter-hero-lead {
  margin: 0;
  max-width: 625px;
  font-size: var(--rbl-text-sm, 0.875rem); /* 14px — align V4/V1 body */
  color: #223248;
  line-height: var(--rbl-leading-body, 1.55);
}

.rbl-jee-chapter-v21 .chapter-hero-stats {
  display: flex;
  align-items: center;
  margin-top: 18px;
  gap: 21px;
  font-size: 13px;
  font-weight: 700;
  color: var(--v21-navy);
}

.rbl-jee-chapter-v21 .chapter-hero-stat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.rbl-jee-chapter-v21 .chapter-hero-stat svg {
  color: var(--chapter-accent);
  flex: 0 0 auto;
}

.rbl-jee-chapter-v21 .chapter-hero-sep {
  width: 1px;
  height: 19px;
  background: color-mix(in srgb, var(--chapter-accent) 40%, #ffffff);
}

.rbl-jee-chapter-v21 .chapter-types-shell {
  position: relative;
  margin: 16px 0 17px;
  max-width: 100%;
  min-width: 0;
}

.rbl-jee-chapter-v21 .chapter-pills {
  display: flex;
  align-items: center;
  gap: 9px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 2px 0 4px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
  min-width: 0;
}

/* Keep pill links clear of overflow chevrons */
.rbl-jee-chapter-v21 .chapter-types-shell.is-overflow-right .chapter-pills {
  padding-right: 36px;
}

.rbl-jee-chapter-v21 .chapter-types-shell.is-overflow-left .chapter-pills {
  padding-left: 36px;
}

.rbl-jee-chapter-v21 .chapter-pills::-webkit-scrollbar {
  display: none;
}

.rbl-jee-chapter-v21 .chapter-pill {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid #d6dce5;
  padding: 8px 14px;
  text-decoration: none;
  border-radius: 30px;
  font-size: var(--rbl-text-sm, 0.875rem); /* 14px — match V1 type-pill */
  font-weight: 700;
  min-height: 44px;
  scroll-snap-align: start;
  white-space: nowrap;
  background: var(--v21-white);
  color: var(--v21-navy);
  line-height: 1.3;
}

/* Mobile overflow affordance — CSS fade + JS-toggled chevrons */
.rbl-jee-chapter-v21 .chapter-pill-fade {
  display: none;
  pointer-events: none;
  position: absolute;
  top: 0;
  bottom: 4px;
  width: 28px;
  z-index: 1;
}

.rbl-jee-chapter-v21 .chapter-pill-fade--right {
  right: 0;
  background: linear-gradient(to right, transparent, #fff 72%);
}

.rbl-jee-chapter-v21 .chapter-pill-fade--left {
  left: 0;
  background: linear-gradient(to left, transparent, #fff 72%);
}

.rbl-jee-chapter-v21 .chapter-pill-nav {
  display: none;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid var(--v21-border);
  background: rgba(255, 255, 255, 0.96);
  color: var(--v21-navy);
  box-shadow: 0 1px 4px rgba(15, 27, 51, 0.08);
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
  line-height: 1;
  font-size: 18px;
  font-weight: 700;
}

.rbl-jee-chapter-v21 .chapter-pill-nav:focus-visible {
  outline: 3px solid #fa782c;
  outline-offset: 2px;
}

.rbl-jee-chapter-v21 .chapter-pill-nav--prev {
  left: 2px;
}

.rbl-jee-chapter-v21 .chapter-pill-nav--next {
  right: 2px;
}

.rbl-jee-chapter-v21 .chapter-types-shell.is-overflow-right .chapter-pill-fade--right,
.rbl-jee-chapter-v21 .chapter-types-shell.is-overflow-left .chapter-pill-fade--left {
  display: block;
}

.rbl-jee-chapter-v21 .chapter-types-shell.is-overflow-right .chapter-pill-nav--next,
.rbl-jee-chapter-v21 .chapter-types-shell.is-overflow-left .chapter-pill-nav--prev {
  display: inline-flex;
}

.rbl-jee-chapter-v21 .chapter-pill:hover {
  border-color: #b7c0ce;
}

.rbl-jee-chapter-v21 .chapter-pill.is-current,
.rbl-jee-chapter-v21 .chapter-pill[aria-current="page"] {
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--chapter-accent) 88%, #ffffff),
    color-mix(in srgb, var(--chapter-accent) 78%, #0f1b33)
  );
  border-color: var(--chapter-accent);
  color: #fff;
}

.rbl-jee-chapter-v21 .chapter-content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 17px;
  align-items: start;
  max-width: 100%;
  min-width: 0;
}

/* Filtered pages with 1–3 PDFs: compact single column (no tall empty sidebar gap). */
.rbl-jee-chapter-v21 .chapter-content-grid.is-sparse {
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  max-width: 760px;
}

.rbl-jee-chapter-v21 .chapter-content-grid.is-sparse .chapter-sidebar {
  max-width: 760px;
}

.rbl-jee-chapter-v21 .chapter-content-grid.is-sparse .chapter-sidebar-box--upload {
  padding: 12px 14px;
}

.rbl-jee-chapter-v21 .chapter-resources {
  border: 1px solid var(--v21-border);
  border-radius: 14px;
  min-width: 0;
  max-width: 100%;
  box-shadow: var(--v21-shadow);
  overflow: hidden;
  background: var(--v21-white);
}

.rbl-jee-chapter-v21 .chapter-resources-heading {
  padding: 16px 20px 11px;
}

.rbl-jee-chapter-v21 .chapter-resources-heading h2 {
  font-size: 19px;
  line-height: 1.2;
  letter-spacing: -0.3px;
  margin: 0 0 3px;
  font-weight: 760;
}

.rbl-jee-chapter-v21 .chapter-resources-caption {
  font-size: 13px;
  color: var(--v21-muted);
}

.rbl-jee-chapter-v21 .chapter-pdf-list {
  margin: 0 16px 11px;
  padding: 0;
  list-style: none;
}

.rbl-jee-chapter-v21 .chapter-pdf {
  padding: 11px 8px 11px 2px;
  display: flex;
  align-items: center;
  gap: 11px;
  border-top: 1px solid var(--v21-border);
  min-height: 55px;
  text-decoration: none;
  color: inherit;
}

.rbl-jee-chapter-v21 .chapter-pdf:hover {
  background: color-mix(in srgb, var(--chapter-accent) 6%, #ffffff);
}

.rbl-jee-chapter-v21 .chapter-pdf:focus-visible {
  outline: 3px solid #fa782c;
  outline-offset: 2px;
}

.rbl-jee-chapter-v21 .chapter-pdf-icon {
  width: 29px;
  height: 34px;
  flex: 0 0 29px;
  border-radius: 4px;
  background: linear-gradient(180deg, #fff7f2, #ffe8da);
  border: 1px solid #f0c9ae;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--v21-orange);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.rbl-jee-chapter-v21 .chapter-pdf-main {
  min-width: 0;
  flex: 1 1 auto;
  overflow-wrap: anywhere;
}

.rbl-jee-chapter-v21 .chapter-pdf-title {
  font-size: var(--rbl-text-sm, 0.875rem); /* ≥14px — match V4/V1 resource titles */
  line-height: 1.4;
  font-weight: 650;
  display: block;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.rbl-jee-chapter-v21 .chapter-pdf-meta {
  margin-top: 3px;
  color: var(--v21-muted);
  font-size: var(--rbl-fs-meta, 0.8125rem); /* ~13px */
  line-height: 1.4;
}

.rbl-jee-chapter-v21 .chapter-pdf-pop {
  white-space: nowrap;
  background: #ffeedb;
  color: #bf4a0e;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
}

.rbl-jee-chapter-v21 .chapter-pdf-chev {
  margin-left: auto;
  font-size: 21px;
  font-weight: 700;
  color: #d94b16;
  line-height: 1;
}

.rbl-jee-chapter-v21 .chapter-sidebar {
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.rbl-jee-chapter-v21 .chapter-sidebar-box {
  border: 1px solid var(--v21-border);
  border-radius: 12px;
  padding: 14px;
  background: var(--v21-white);
}

.rbl-jee-chapter-v21 .chapter-sidebar-box h3 {
  font-size: 15px;
  margin: 0 0 8px;
}

.rbl-jee-chapter-v21 .chapter-side-list {
  display: grid;
  gap: 1px;
}

.rbl-jee-chapter-v21 .chapter-side-list a {
  min-height: 39px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 8px;
  color: #23364a;
  text-decoration: none;
  border-bottom: 1px solid #ecedf1;
  font-size: 12.5px;
  font-weight: 600;
}

.rbl-jee-chapter-v21 .chapter-side-list a:last-child {
  border-bottom: 0;
}

.rbl-jee-chapter-v21 .chapter-side-list a.is-current,
.rbl-jee-chapter-v21 .chapter-side-list a[aria-current="page"] {
  background: color-mix(in srgb, var(--chapter-accent) 16%, #ffffff);
  border-radius: 8px;
}

.rbl-jee-chapter-v21 .chapter-side-list span {
  color: var(--v21-muted);
  font-weight: 700;
}

.rbl-jee-chapter-v21 .chapter-continue {
  display: flex;
  align-items: center;
  gap: 9px;
  background: color-mix(in srgb, var(--chapter-accent) 12%, #ffffff);
  border: 1px solid color-mix(in srgb, var(--chapter-accent) 22%, #ffffff);
  border-radius: 13px;
  padding: 14px 12px;
  text-decoration: none;
  color: inherit;
  min-height: 44px;
}

.rbl-jee-chapter-v21 .chapter-continue .chapter-continue-text {
  flex: 1;
  font-weight: 750;
  font-size: 13.5px;
}

.rbl-jee-chapter-v21 .chapter-continue small {
  display: block;
  font-size: 12px;
  color: #334b45;
  font-weight: 450;
  margin-top: 2px;
}

.rbl-jee-chapter-v21 .chapter-subject-link {
  display: block;
  text-align: center;
  text-decoration: none;
  color: #e35a1a;
  border: 1.5px solid #ee7539;
  padding: 12px 8px;
  border-radius: 13px;
  font-size: 13px;
  font-weight: 750;
  min-height: 44px;
}

.rbl-jee-chapter-v21 .chapter-upload {
  font-size: 12.5px;
  color: #526078;
  line-height: 1.45;
  margin: 0;
}

.rbl-jee-chapter-v21 .chapter-upload-btn {
  display: block;
  margin-top: 10px;
  padding: 10px;
  border-radius: 8px;
  background: var(--v21-orange);
  color: #fff;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  min-height: 44px;
}

.rbl-jee-chapter-v21 .chapter-disclaimer {
  font-size: 12px;
  color: var(--v21-muted);
  max-width: 850px;
  margin: 21px 0 12px;
}

.rbl-jee-chapter-v21 .chapter-pagination {
  margin: 12px 16px 16px;
}

.rbl-jee-chapter-v21 .chapter-empty {
  padding: 20px;
  color: var(--v21-muted);
  font-size: 14px;
}

@media (max-width: 1000px) {
  .rbl-jee-chapter-v21 .chapter-content-grid {
    grid-template-columns: minmax(0, 1fr) 220px;
  }

  .rbl-jee-chapter-v21 .chapter-hero-title {
    font-size: 28px;
  }
}

@media (max-width: 760px) {
  .rbl-jee-chapter-v21 .rbl-jee-chapter-v21-shell {
    width: calc(100% - 30px);
    padding-bottom: 96px;
  }

  .rbl-jee-chapter-v21 .rbl-jee-chapter-v21-breadcrumb {
    font-size: 11px;
    line-height: 1.7;
    margin: 12px 0 11px;
  }

  .rbl-jee-chapter-v21 .chapter-hero {
    padding: 16px 15px 14px;
    min-height: 183px;
    border-radius: 14px;
    background-image: var(--v21-hero-mobile);
    background-position: right center;
  }

  .rbl-jee-chapter-v21 .chapter-hero-title {
    font-size: 23px;
    line-height: 1.11;
    max-width: 310px;
    letter-spacing: -0.45px;
    margin: 9px 0 5px;
  }

  .rbl-jee-chapter-v21 .chapter-hero-lead {
    font-size: var(--rbl-text-sm, 0.875rem); /* keep ≥14px on mobile */
    max-width: 300px;
    line-height: var(--rbl-leading-body, 1.5);
  }

  .rbl-jee-chapter-v21 .chapter-hero-eyebrow {
    font-size: 11px;
    padding: 3px 8px;
  }

  .rbl-jee-chapter-v21 .chapter-hero-stats {
    margin-top: 12px;
    gap: 12px;
    font-size: 13px;
  }

  .rbl-jee-chapter-v21 .chapter-types-shell {
    margin: 13px 0 14px;
  }

  .rbl-jee-chapter-v21 .chapter-pills {
    gap: 7px;
    padding-right: 4px;
  }

  .rbl-jee-chapter-v21 .chapter-pill {
    font-size: 0.8125rem; /* 13px mobile floor within 13–14px band */
    min-height: 44px;
    padding: 8px 12px;
  }

  .rbl-jee-chapter-v21 .chapter-content-grid {
    display: block;
  }

  .rbl-jee-chapter-v21 .chapter-resources {
    border-radius: 12px;
  }

  .rbl-jee-chapter-v21 .chapter-resources-heading {
    padding: 13px 14px 9px;
  }

  .rbl-jee-chapter-v21 .chapter-resources-heading h2 {
    font-size: 17px;
  }

  .rbl-jee-chapter-v21 .chapter-pdf-list {
    margin: 0 10px 10px;
  }

  .rbl-jee-chapter-v21 .chapter-pdf {
    min-height: 72px;
    padding: 11px 2px;
    gap: 9px;
  }

  .rbl-jee-chapter-v21 .chapter-pdf-title {
    font-size: var(--rbl-text-sm, 0.875rem); /* ≥14px */
  }

  .rbl-jee-chapter-v21 .chapter-pdf-meta {
    font-size: var(--rbl-fs-meta, 0.8125rem); /* ~13px */
  }

  .rbl-jee-chapter-v21 .chapter-pdf-pop {
    font-size: 11px;
    padding: 3px 7px;
  }

  .rbl-jee-chapter-v21 .chapter-pdf-icon {
    width: 24px;
    height: 28px;
    flex-basis: 24px;
    font-size: 9px;
  }

  .rbl-jee-chapter-v21 .chapter-sidebar {
    margin-top: 15px;
    gap: 10px;
  }

  .rbl-jee-chapter-v21 .chapter-sidebar-box--types,
  .rbl-jee-chapter-v21 .chapter-sidebar-box--upload {
    display: none;
  }

  .rbl-jee-chapter-v21 .chapter-disclaimer {
    font-size: 11px;
    margin: 14px 0 12px;
  }
}

@media (max-width: 359px) {
  .rbl-jee-chapter-v21 .rbl-jee-chapter-v21-shell {
    width: calc(100% - 24px);
  }

  .rbl-jee-chapter-v21 .chapter-hero {
    padding: 13px 12px 12px;
    min-height: 172px;
  }

  .rbl-jee-chapter-v21 .chapter-hero-title {
    font-size: 21px;
    max-width: 270px;
  }

  .rbl-jee-chapter-v21 .chapter-hero-lead {
    font-size: var(--rbl-text-sm, 0.875rem);
    max-width: 265px;
  }

  .rbl-jee-chapter-v21 .chapter-hero-eyebrow {
    font-size: 10px;
  }

  .rbl-jee-chapter-v21 .chapter-hero-stats {
    gap: 9px;
    margin-top: 11px;
  }

  .rbl-jee-chapter-v21 .rbl-jee-chapter-v21-breadcrumb {
    font-size: 10.4px;
    margin: 10px 0 9px;
  }

  .rbl-jee-chapter-v21 .chapter-pdf-title {
    font-size: var(--rbl-text-sm, 0.875rem);
  }

  .rbl-jee-chapter-v21 .chapter-pdf-list {
    margin-left: 8px;
    margin-right: 8px;
  }

  .rbl-jee-chapter-v21 .chapter-resources-heading {
    padding: 12px 11px 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rbl-jee-chapter-v21 * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}