/*
 * Maninder English Grammar Hub polish.
 * Phase 3: grammar hero, topic navigation, lesson cards, sidebar, and mobile rhythm.
 */

body.grammar-hub {
  background:
    linear-gradient(180deg, var(--me-white) 0%, var(--me-cream-50) 42%, var(--me-white) 100%);
  color: var(--me-ink-900);
}

body.grammar-hub .wrap {
  max-width: min(1160px, calc(100vw - 48px));
  padding-inline: 0;
}

body.grammar-hub .me-nav {
  top: 12px;
  width: min(1160px, calc(100vw - 32px));
  margin: 0 auto;
  border: 1px solid rgba(232, 228, 220, .86);
  border-radius: 16px;
  background: rgba(255, 255, 255, .88);
  box-shadow: 0 8px 28px rgba(26, 37, 64, .06);
}

body.grammar-hub .me-nav.scrolled {
  background: rgba(255, 255, 255, .95);
  box-shadow: 0 14px 34px rgba(26, 37, 64, .12);
}

body.grammar-hub .me-nav[style] {
  position: sticky !important;
}

body.grammar-hub .me-nav-inner {
  height: 64px;
  max-width: 100%;
  padding-inline: 18px;
  gap: 22px;
}

body.grammar-hub .me-logo {
  color: var(--me-ink-800);
  letter-spacing: 0;
}

body.grammar-hub .me-nav-links {
  gap: 4px;
}

body.grammar-hub .me-nav-links a {
  padding: 8px 13px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--me-muted-700);
  font-weight: 600;
  transition:
    transform var(--me-duration-base) var(--me-ease-out),
    color var(--me-duration-fast) var(--me-ease-standard),
    background-color var(--me-duration-fast) var(--me-ease-standard),
    border-color var(--me-duration-fast) var(--me-ease-standard);
}

body.grammar-hub .me-nav-links a:hover {
  transform: translateY(-1px);
  border-color: var(--me-border);
  background: var(--me-cream-50);
  color: var(--me-ink-800);
}

body.grammar-hub .me-nav-links a.active {
  border-color: rgba(102, 51, 221, .18);
  background: var(--me-violet-100);
  color: var(--me-violet-600);
}

body.grammar-hub .nav-yt {
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(255, 0, 0, .22);
}

body.grammar-hub .gh-hero {
  position: relative;
  margin-top: -76px;
  padding: clamp(140px, 14vw, 174px) 0 clamp(70px, 8vw, 100px);
  border-bottom: 1px solid var(--me-border);
  background:
    linear-gradient(135deg, rgba(237, 232, 251, .72) 0%, rgba(255, 255, 255, 0) 34%),
    linear-gradient(180deg, #ffffff 0%, #fbfaf7 100%);
  overflow: hidden;
}

body.grammar-hub .gh-hero::before {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 48%;
  background-image: radial-gradient(rgba(26, 37, 64, .07) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: .34;
  pointer-events: none;
}

body.grammar-hub .gh-hero .wrap {
  position: relative;
  z-index: 1;
}

body.grammar-hub .gh-tag {
  min-height: 32px;
  margin-bottom: 26px;
  padding: 8px 16px;
  border: 1px solid rgba(102, 51, 221, .2);
  border-radius: var(--me-radius-pill);
  background: var(--me-violet-100);
  box-shadow: 0 10px 24px rgba(102, 51, 221, .08);
  color: var(--me-violet-600);
  letter-spacing: .08em;
}

body.grammar-hub .gh-hero h1 {
  max-width: 820px;
  margin-bottom: 22px;
  color: var(--me-ink-800);
  font-size: clamp(44px, 5.6vw, 72px);
  letter-spacing: 0;
  line-height: 1;
}

body.grammar-hub .gh-hero h1 em {
  background: linear-gradient(130deg, var(--me-violet-600), var(--me-violet-500));
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

body.grammar-hub .gh-hi {
  width: fit-content;
  max-width: 760px;
  margin-bottom: 24px;
  padding: 10px 16px;
  border: 1px solid rgba(181, 71, 15, .16);
  border-left: 4px solid var(--me-saffron-700);
  border-radius: 0 12px 12px 0;
  background: rgba(254, 243, 199, .54);
  color: var(--me-saffron-700);
}

body.grammar-hub .gh-hero-sub {
  max-width: 690px;
  color: var(--me-muted-700);
  font-size: clamp(17px, 1.45vw, 19px);
}

body.grammar-hub .gh-hero-stats {
  width: min(100%, 760px);
  gap: 0;
  padding: 18px;
  border: 1px solid rgba(232, 228, 220, .9);
  border-radius: 18px;
  background: rgba(255, 255, 255, .72);
  box-shadow: var(--me-shadow-sm);
}

body.grammar-hub .gh-stat {
  flex: 1;
  min-width: 120px;
  padding-inline: 20px;
}

body.grammar-hub .gh-stat + .gh-stat {
  border-left: 1px solid var(--me-border);
}

body.grammar-hub .gh-stat-num {
  color: var(--me-ink-800);
  letter-spacing: 0;
}

body.grammar-hub .gh-stat-label {
  color: var(--me-muted-600);
}

body.grammar-hub .gh-topic-nav {
  top: 88px;
  z-index: 390;
  width: min(1160px, calc(100vw - 32px));
  margin: -26px auto 0;
  border: 1px solid rgba(232, 228, 220, .9);
  border-radius: 16px;
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 12px 30px rgba(26, 37, 64, .08);
}

body.grammar-hub .gh-topic-nav-inner {
  max-width: 100%;
  padding-inline: 10px;
}

body.grammar-hub .gh-topic-nav::before,
body.grammar-hub .gh-topic-nav::after {
  display: none;
}

body.grammar-hub .gh-tnav-item,
body.grammar-hub .gh-tnav-more-btn {
  margin: 8px 2px;
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--me-muted-700);
  font-weight: 700;
  transition:
    transform var(--me-duration-base) var(--me-ease-out),
    color var(--me-duration-fast) var(--me-ease-standard),
    background-color var(--me-duration-fast) var(--me-ease-standard),
    border-color var(--me-duration-fast) var(--me-ease-standard);
}

body.grammar-hub .gh-tnav-item:hover,
body.grammar-hub .gh-tnav-more-btn:hover,
body.grammar-hub .gh-tnav-more.open .gh-tnav-more-btn {
  transform: translateY(-1px);
  border-color: var(--me-border);
  background: var(--me-cream-50);
  color: var(--me-ink-800);
}

body.grammar-hub .gh-tnav-item.active,
body.grammar-hub .gh-tnav-more.active .gh-tnav-more-btn {
  border-color: rgba(102, 51, 221, .18);
  background: var(--me-violet-100);
  color: var(--me-violet-600);
}

body.grammar-hub .gh-tnav-more-panel {
  border: 1px solid var(--me-border);
  border-radius: 14px;
  box-shadow: var(--me-shadow-lg);
}

body.grammar-hub .gh-body {
  padding: clamp(58px, 7vw, 88px) 0 clamp(76px, 8vw, 108px);
}

body.grammar-hub .gh-grid {
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: clamp(34px, 5vw, 58px);
}

body.grammar-hub .gh-topic-block {
  margin-bottom: clamp(54px, 7vw, 78px);
}

body.grammar-hub .gh-topic-header {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--me-border);
}

body.grammar-hub .gh-topic-eye {
  padding: 6px 13px;
  border: 1px solid rgba(102, 51, 221, .14);
  border-radius: 999px;
  background: var(--me-violet-100);
  letter-spacing: .08em;
}

body.grammar-hub .gh-topic-count {
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--me-white);
}

body.grammar-hub .gh-topic-title {
  color: var(--me-ink-800);
  letter-spacing: 0;
}

body.grammar-hub .gh-topic-desc {
  max-width: 680px;
  color: var(--me-muted-700);
}

body.grammar-hub .gh-lessons-grid {
  gap: 20px;
}

body.grammar-hub .gh-lesson-card {
  position: relative;
  padding: 24px;
  border: 1px solid var(--me-border);
  border-radius: 18px;
  background:
    linear-gradient(180deg, var(--me-white), var(--me-cream-50));
  box-shadow:
    0 1px 2px rgba(17, 24, 39, .04),
    0 10px 28px rgba(26, 37, 64, .08);
  overflow: hidden;
  transition:
    transform var(--me-duration-base) var(--me-ease-out),
    box-shadow var(--me-duration-base) var(--me-ease-out),
    border-color var(--me-duration-fast) var(--me-ease-standard);
}

body.grammar-hub .gh-lesson-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--me-violet-600), var(--me-violet-500));
  opacity: 0;
  transform: scaleX(.35);
  transform-origin: left center;
  transition:
    opacity var(--me-duration-base) var(--me-ease-standard),
    transform var(--me-duration-slow) var(--me-ease-out);
}

body.grammar-hub .gh-lesson-card:hover {
  border-color: rgba(102, 51, 221, .28);
  box-shadow:
    0 2px 6px rgba(17, 24, 39, .05),
    0 22px 46px rgba(26, 37, 64, .14);
  transform: translateY(-5px);
}

body.grammar-hub .gh-lesson-card:hover::before {
  opacity: 1;
  transform: scaleX(1);
}

body.grammar-hub .gh-lc-num,
body.grammar-hub .gh-lc-level {
  border-radius: 999px;
}

body.grammar-hub .gh-lc-title {
  color: var(--me-ink-800);
  font-size: 17px;
  letter-spacing: 0;
}

body.grammar-hub .gh-lc-desc {
  color: var(--me-muted-700);
}

body.grammar-hub .gh-lc-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(102, 51, 221, .18);
  border-radius: 999px;
  background: var(--me-violet-100);
}

body.grammar-hub .gh-aside {
  top: 128px;
}

body.grammar-hub .gh-aside-section,
body.grammar-hub .gh-tutor-cta {
  border-radius: 18px;
  box-shadow: var(--me-shadow-sm);
}

body.grammar-hub .gh-aside-section {
  border: 1px solid var(--me-border);
  background: rgba(255, 255, 255, .78);
}

body.grammar-hub .gh-aside-label {
  color: var(--me-muted-600);
  letter-spacing: .08em;
}

body.grammar-hub .gh-topic-list a {
  border-radius: 10px;
  padding: 10px 8px;
  border-bottom: 0;
}

body.grammar-hub .gh-topic-list a:hover {
  background: var(--me-violet-100);
}

body.grammar-hub .gh-tutor-cta {
  border: 1px solid rgba(255, 255, 255, .18);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, .12) 0%, rgba(255, 255, 255, 0) 45%),
    linear-gradient(135deg, var(--me-violet-600), var(--me-violet-700));
}

body.grammar-hub .gh-tutor-btn {
  border-radius: 12px;
  box-shadow: 0 10px 22px rgba(17, 24, 39, .12);
  transition:
    transform var(--me-duration-base) var(--me-ease-out),
    box-shadow var(--me-duration-base) var(--me-ease-out),
    opacity var(--me-duration-fast) var(--me-ease-standard);
}

body.grammar-hub .gh-tutor-btn:hover {
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(17, 24, 39, .18);
}

body.grammar-hub footer.me-footer {
  background:
    linear-gradient(180deg, #1a2540 0%, #111827 100%);
}

body.grammar-hub .foot-logo {
  letter-spacing: 0;
}

body.grammar-hub .foot-col a {
  display: inline-flex;
  transform-origin: left center;
}

body.grammar-hub .foot-col a:hover {
  transform: translateX(3px);
}

@media (max-width: 900px) {
  body.grammar-hub .gh-grid {
    grid-template-columns: 1fr;
  }

  body.grammar-hub .gh-aside {
    position: static;
  }
}

@media (max-width: 720px) {
  body.grammar-hub .wrap {
    max-width: calc(100vw - 32px);
  }

  body.grammar-hub .me-nav {
    top: 8px;
    width: calc(100vw - 20px);
    border-radius: 14px;
  }

  body.grammar-hub .me-nav-inner {
    height: 60px;
    padding-inline: 14px;
  }

  body.grammar-hub .gh-hero {
    margin-top: -68px;
    padding-top: 122px;
  }

  body.grammar-hub .gh-hero h1 {
    font-size: clamp(38px, 12vw, 56px);
  }

  body.grammar-hub .gh-hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  body.grammar-hub .gh-stat {
    padding: 0;
  }

  body.grammar-hub .gh-stat + .gh-stat {
    border-left: 0;
  }

  body.grammar-hub .gh-topic-nav {
    top: 78px;
    width: calc(100vw - 20px);
    margin: 0 auto;
  }

  body.grammar-hub .gh-tnav-select {
    padding: 14px 16px;
    border-radius: 14px;
    background: transparent;
  }

  body.grammar-hub .gh-body {
    padding-top: 72px;
  }

  body.grammar-hub .gh-topic-header {
    margin-top: 20px;
    margin-bottom: 20px;
  }

  body.grammar-hub .gh-lessons-grid {
    grid-template-columns: 1fr;
  }

  body.grammar-hub .foot-grid,
  body.grammar-hub .foot-bottom {
    padding-inline: 18px;
  }
}

@media (max-width: 520px) {
  body.grammar-hub .gh-hero-stats {
    grid-template-columns: 1fr;
  }
}