@import url("https://fonts.googleapis.com/css2?family=Raleway:wght@400;500;600;700;800&display=swap");

:root {
  --hub-blue: #3884cc;
  --hub-blue-dark: #1e5f9d;
  --hub-blue-deep: #174d80;
  --hub-blue-soft: #eff6ff;
  --hub-ink: #172033;
  --hub-muted: #5d6878;
  --hub-line: #dbe5f0;
  --hub-page: #f4f7fa;
  --hub-white: #ffffff;
  --hub-shadow: 0 10px 28px rgba(23, 32, 51, 0.08);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--hub-ink);
  background: var(--hub-page);
  font-family: "Raleway", Arial, sans-serif;
}

body *,
body *::before,
body *::after {
  box-sizing: border-box;
}

header,
nav {
  z-index: 1000;
}

.discussion-hub {
  width: min(100% - 32px, 1500px);
  margin: 0 auto;
  padding: 34px 0 64px;
}

.discussion-hub-hero {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: 32px;
  align-items: center;
  margin-bottom: 24px;
  padding: 30px 34px;
  overflow: hidden;
  color: var(--hub-white);
  border-radius: 20px;
  background:
    radial-gradient(circle at 90% 10%, rgba(255, 255, 255, 0.2), transparent 30%),
    linear-gradient(135deg, var(--hub-blue-dark), var(--hub-blue));
  box-shadow: 0 16px 38px rgba(30, 95, 157, 0.2);
}

.discussion-hub-hero::after {
  position: absolute;
  right: -55px;
  bottom: -100px;
  width: 240px;
  height: 240px;
  border: 34px solid rgba(255, 255, 255, 0.07);
  border-radius: 50%;
  content: "";
}

.discussion-hub-hero > * {
  position: relative;
  z-index: 1;
}

.discussion-hub-eyebrow,
.hub-panel-eyebrow {
  display: block;
  margin: 0 0 7px;
  color: var(--hub-blue-dark);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  line-height: 1.3;
  text-transform: uppercase;
}

.discussion-hub-hero .discussion-hub-eyebrow {
  color: #dbeafe;
}

.discussion-hub-hero h1 {
  margin: 0;
  padding: 0 0 0 15px;
  color: var(--hub-white);
  border-left: 4px solid #bfdbfe;
  font-size: clamp(2rem, 4vw, 3.15rem);
  font-weight: 800;
  line-height: 1.08;
}

.discussion-hub-hero p {
  max-width: 780px;
  margin: 13px 0 0;
  padding: 0;
  color: #eff6ff;
  font-size: 1rem;
  line-height: 1.65;
}

.discussion-hub-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(92px, 1fr));
  min-width: 340px;
  margin: 0;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(5px);
}

.discussion-hub-stats div {
  padding: 14px 11px;
  text-align: center;
}

.discussion-hub-stats div + div {
  border-left: 1px solid rgba(255, 255, 255, 0.2);
}

.discussion-hub-stats dt {
  color: var(--hub-white);
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1;
}

.discussion-hub-stats dd {
  margin: 6px 0 0;
  color: #dbeafe;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.discussion-hub-layout {
  display: grid;
  grid-template-columns: minmax(230px, 0.75fr) minmax(500px, 1.8fr) minmax(270px, 0.9fr);
  gap: 20px;
  align-items: start;
}

.hub-panel {
  position: sticky;
  top: 88px;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--hub-line);
  border-radius: 16px;
  background: var(--hub-white);
  box-shadow: var(--hub-shadow);
}

.hub-panel-heading {
  padding: 19px 18px 16px;
  border-bottom: 1px solid var(--hub-line);
  background: linear-gradient(180deg, #ffffff, #f8fbff);
}

.hub-panel-heading h2,
.discussion-feed-heading h2 {
  margin: 0;
  padding: 0 0 0 10px;
  color: var(--hub-ink);
  border-left: 4px solid var(--hub-blue);
  font-size: 1.23rem;
  font-weight: 800;
  line-height: 1.25;
}

.discussion-search-label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.discussion-topic-search,
.vtl-guide-panel .vtl-search-bar {
  display: block;
  width: calc(100% - 24px) !important;
  height: auto;
  margin: 12px !important;
  padding: 10px 12px !important;
  color: var(--hub-ink);
  border: 1px solid #c9d6e4 !important;
  border-radius: 9px !important;
  outline: none;
  background: var(--hub-white) !important;
  box-shadow: none !important;
  font: 500 0.84rem/1.3 "Raleway", Arial, sans-serif !important;
}

.discussion-topic-search:focus,
.vtl-guide-panel .vtl-search-bar:focus {
  border-color: var(--hub-blue) !important;
  box-shadow: 0 0 0 3px rgba(56, 132, 204, 0.15) !important;
}

.discussion-search-status {
  min-height: 0;
  margin: -4px 15px 8px;
  padding: 0;
  color: var(--hub-muted);
  font-size: 0.72rem;
}

.discussion-search-status:empty {
  display: none;
}

.discussion-directory-list {
  max-height: calc(100vh - 300px);
  min-height: 300px;
  margin: 0;
  padding: 0 10px 12px;
  overflow-y: auto;
  overscroll-behavior: contain;
  list-style: none;
  scrollbar-color: #a9bfd5 transparent;
  scrollbar-width: thin;
}

.discussion-directory-item {
  margin: 0;
  border-bottom: 1px solid #edf1f5;
}

.discussion-directory-item[hidden] {
  display: none;
}

.discussion-directory-item a {
  display: block;
  padding: 11px 8px;
  color: var(--hub-ink);
  text-decoration: none;
  border-radius: 8px;
  transition: background-color 150ms ease, color 150ms ease;
}

.discussion-directory-item a:hover,
.discussion-directory-item a:focus-visible {
  color: var(--hub-blue-dark);
  background: var(--hub-blue-soft);
  outline: none;
}

.discussion-directory-topic,
.discussion-directory-count {
  display: block;
}

.discussion-directory-topic {
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.35;
}

.discussion-directory-count {
  margin-top: 3px;
  color: var(--hub-muted);
  font-size: 0.68rem;
  font-weight: 600;
}

.discussion-feed {
  min-width: 0;
}

.discussion-feed-heading {
  margin-bottom: 12px;
  padding: 20px 22px;
  border: 1px solid var(--hub-line);
  border-radius: 16px;
  background: var(--hub-white);
  box-shadow: var(--hub-shadow);
}

.discussion-feed-heading p {
  margin: 10px 0 0;
  padding: 0;
  color: var(--hub-muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.discussion-feed-list {
  display: grid;
  gap: 12px;
}

.discussion-feed-card {
  position: relative;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--hub-line);
  border-radius: 14px;
  background: var(--hub-white);
  box-shadow: 0 5px 18px rgba(23, 32, 51, 0.055);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.discussion-feed-card:hover,
.discussion-feed-card:focus-within {
  border-color: #9bc1e6;
  box-shadow: 0 12px 28px rgba(30, 95, 157, 0.13);
  transform: translateY(-1px);
}

.discussion-feed-card[hidden] {
  display: none;
}

.discussion-feed-card-link {
  position: absolute;
  z-index: 2;
  inset: 0;
  border-radius: inherit;
}

.discussion-feed-card-link:focus-visible {
  outline: 3px solid var(--hub-blue);
  outline-offset: -4px;
}

.feed-card-accent {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 19px;
  color: var(--hub-blue);
  border-right: 1px solid #e2ebf4;
  background: linear-gradient(180deg, var(--hub-blue-soft), #f8fbff);
}

.feed-card-accent svg {
  width: 22px;
  height: 22px;
}

.feed-card-content {
  min-width: 0;
  padding: 16px 18px 14px;
}

.feed-card-kicker {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--hub-blue-dark);
  font-size: 0.73rem;
  font-weight: 800;
  line-height: 1.3;
}

.feed-card-kicker::before {
  width: 6px;
  height: 6px;
  flex: 0 0 6px;
  border-radius: 50%;
  background: var(--hub-blue);
  content: "";
}

.feed-card-meta {
  margin: 5px 0 0;
  padding: 0;
  color: var(--hub-muted);
  font-size: 0.71rem;
  line-height: 1.35;
}

.discussion-feed-card h3 {
  margin: 12px 0 0;
  padding: 0;
  color: var(--hub-ink);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  font-weight: 700;
  line-height: 1.48;
}

.feed-answer {
  margin-top: 13px;
  padding: 10px 12px;
  border-left: 3px solid var(--hub-blue);
  border-radius: 0 8px 8px 0;
  background: #f7faff;
}

.feed-answer-label {
  color: var(--hub-blue-dark);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.feed-answer p {
  margin: 5px 0 0;
  padding: 0;
  color: #405068;
  font-size: 0.82rem;
  line-height: 1.48;
}

.feed-card-footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  margin-top: 14px;
  padding-top: 11px;
  color: var(--hub-muted);
  border-top: 1px solid #edf1f5;
  font-size: 0.72rem;
  font-weight: 700;
}

.feed-card-read {
  color: var(--hub-blue-dark);
}

.discussion-feed-sentinel {
  display: flex;
  justify-content: center;
  gap: 6px;
  min-height: 60px;
  align-items: center;
}

.discussion-feed-sentinel[hidden] {
  display: none;
}

.discussion-feed-sentinel span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--hub-blue);
  animation: hub-pulse 1.2s infinite ease-in-out;
}

.discussion-feed-sentinel span:nth-child(2) {
  animation-delay: 150ms;
}

.discussion-feed-sentinel span:nth-child(3) {
  animation-delay: 300ms;
}

.discussion-feed-status {
  margin: 0;
  padding: 2px 0 10px;
  color: var(--hub-muted);
  font-size: 0.73rem;
  text-align: center;
}

@keyframes hub-pulse {
  0%,
  70%,
  100% {
    opacity: 0.35;
    transform: scale(0.8);
  }
  35% {
    opacity: 1;
    transform: scale(1);
  }
}

.vtl-guide-intro {
  margin: 0;
  padding: 14px 16px 2px;
  color: var(--hub-muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.vtl-guide-panel .sidebar {
  width: auto !important;
  max-height: calc(100vh - 300px);
  min-height: 300px;
  margin: 0 !important;
  padding: 0 10px 13px !important;
  overflow-y: auto !important;
  overscroll-behavior: contain;
  border: 0 !important;
  background: transparent;
  scrollbar-color: #a9bfd5 transparent;
  scrollbar-width: thin;
}

.vtl-guide-panel .vtl-search-bar {
  top: 0;
  z-index: 4;
  width: 100% !important;
  margin: 10px 0 !important;
}

.vtl-guide-panel .vtl-card {
  margin: 0 !important;
  border-bottom: 1px solid #edf1f5;
}

.vtl-guide-panel .vtl-card a {
  display: block;
  padding: 10px 8px;
  color: var(--hub-ink) !important;
  border-radius: 8px;
  font-family: "Raleway", Arial, sans-serif;
  font-size: 0.8rem !important;
  font-weight: 700;
  line-height: 1.35;
  text-decoration: none;
}

.vtl-guide-panel .vtl-card a:hover,
.vtl-guide-panel .vtl-card a:focus-visible {
  color: var(--hub-blue-dark) !important;
  background: var(--hub-blue-soft);
  outline: none;
}

.discussion-hub-disclaimer {
  padding: 18px max(24px, calc((100vw - 1180px) / 2));
  color: var(--hub-white);
  background: var(--hub-blue);
}

.discussion-hub-disclaimer p {
  margin: 0;
  padding: 0;
  font-size: 0.73rem;
  line-height: 1.5;
}

.discussion-hub-footer {
  padding: 13px max(24px, calc((100vw - 1180px) / 2));
  color: var(--hub-white);
  background: #090909;
  text-align: center;
}

.discussion-hub-footer p {
  margin: 3px 0;
  padding: 0;
  color: inherit;
  font-size: 0.7rem;
  line-height: 1.45;
}

@media (min-width: 1280px) {
  .discussion-hub-hero > div:first-child {
    text-align: center;
  }

  .discussion-hub-hero h1 {
    padding-left: 0;
    border-left: 0;
    text-align: center;
  }

  .discussion-hub-hero p {
    margin-right: auto;
    margin-left: auto;
  }

  .discussion-directory,
  .vtl-guide-panel {
    display: flex;
    height: calc(100vh - 112px);
    min-height: 480px;
    max-height: 720px;
    flex-direction: column;
  }

  .discussion-directory-list,
  .vtl-guide-panel .sidebar {
    height: 0;
    min-height: 0;
    max-height: none;
    flex: 1 1 auto;
  }
}

@media (min-width: 1536px) {
  .discussion-hub {
    width: 100%;
    max-width: none;
    padding-right: 20px;
    padding-left: 20px;
  }

  .discussion-hub-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) minmax(0, 1fr);
  }
}

@media (max-width: 1279px) {
  .discussion-hub-layout {
    grid-template-columns: minmax(225px, 0.7fr) minmax(0, 1.7fr);
  }

  .vtl-guide-panel {
    position: static;
    grid-column: 1 / -1;
  }

  .vtl-guide-panel .sidebar {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 16px;
    max-height: 380px;
  }

  .vtl-guide-panel .vtl-search-bar {
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  .discussion-hub {
    width: min(100% - 24px, 760px);
    padding-top: 20px;
  }

  .discussion-hub-hero {
    display: block;
    padding: 25px 22px;
  }

  .discussion-hub-stats {
    min-width: 0;
    margin-top: 22px;
  }

  .discussion-hub-layout {
    display: flex;
    flex-direction: column;
  }

  .discussion-feed {
    order: 3;
    width: 100%;
  }

  .discussion-directory {
    order: 1;
  }

  .vtl-guide-panel {
    order: 2;
  }

  .hub-panel {
    position: static;
    width: 100%;
  }

  .discussion-directory-list,
  .vtl-guide-panel .sidebar {
    max-height: 390px;
    min-height: 0;
  }
}

@media (max-width: 620px) {
  .discussion-hub {
    width: min(100% - 16px, 520px);
  }

  .discussion-hub-hero {
    border-radius: 14px;
  }

  .discussion-hub-hero h1 {
    font-size: 2rem;
  }

  .discussion-hub-stats {
    grid-template-columns: 1fr;
  }

  .discussion-hub-stats div {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
  }

  .discussion-hub-stats div + div {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    border-left: 0;
  }

  .discussion-hub-stats dd {
    margin: 0;
  }

  .discussion-feed-card {
    grid-template-columns: 36px minmax(0, 1fr);
  }

  .feed-card-accent {
    padding-top: 18px;
  }

  .feed-card-accent svg {
    width: 18px;
    height: 18px;
  }

  .feed-card-content {
    padding: 14px 13px 13px;
  }

  .feed-card-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }

  .vtl-guide-panel .sidebar {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .discussion-feed-card,
  .discussion-directory-item a {
    transition: none;
  }

  .discussion-feed-sentinel span {
    animation: none;
  }
}