/**
 * Knowledge Base (articles)
 *
 * Editorial article library: card grid and the reading shell around an article.
 * The article's own typography lives in knowledge-blocks.css and the writing
 * desk in knowledge-composer.css, because both are shared with other surfaces.
 * .kbase-* namespace; shared portal chrome lives in portal-hub.css.
 */

/* ========================================
   PANEL
   ======================================== */

.kbase-panel {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-5);
}

/* ========================================
   CARD GRID
   ======================================== */

.kbase-grid-host {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.kbase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-4);
}

/* ========================================
   FEATURE CARD (Aufmacher)
   ======================================== */

.kbase-feature {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  width: 100%;
  min-height: 240px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-family-secondary);
  background: var(--gradient-navy-surface);
  box-shadow: var(--shadow-navy-raised);
  transition:
    transform var(--duration-200) var(--ease-out),
    box-shadow var(--duration-200) var(--ease-in-out);
}

.kbase-feature:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-navy-raised-hover);
}

.kbase-feature:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.kbase-feature-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-3);
  padding: var(--spacing-8);
  color: var(--color-white);
}

.kbase-feature-title {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
}

.kbase-feature-summary {
  font-size: var(--font-size-md);
  color: rgba(255, 255, 255, 0.85);
  line-height: var(--line-height-relaxed);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kbase-feature-meta {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.7);
}

.kbase-feature-cta {
  margin-top: auto;
  padding-top: var(--spacing-2);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent-light);
}

.kbase-feature-cta .icon {
  display: inline-flex;
  transition: transform var(--duration-200) var(--ease-out);
}

.kbase-feature:hover .kbase-feature-cta .icon {
  transform: translateX(4px);
}

.kbase-feature-media {
  position: relative;
  overflow: hidden;
}

.kbase-feature-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Blends the photo's cut edge into the navy body instead of a hard seam. */
.kbase-feature-media:not(.kbase-feature-media--emblem)::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--color-primary) 0%, rgba(16, 39, 76, 0) 45%);
}

.kbase-feature-media--emblem {
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.12);
}

.kbase-card {
  display: flex;
  flex-direction: column;
  text-align: left;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  overflow: hidden;
  font-family: var(--font-family-secondary);
  transition:
    transform var(--duration-200) var(--ease-out),
    box-shadow var(--duration-200) var(--ease-in-out),
    border-color var(--duration-200) var(--ease-in-out);
}

.kbase-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary-200);
}

.kbase-card:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.kbase-card-media {
  display: block;
  aspect-ratio: 16 / 7;
  background: var(--color-primary-50);
  overflow: hidden;
}

.kbase-card-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-500) var(--ease-expo-out);
}

.kbase-card:hover .kbase-card-image {
  transform: scale(1.03);
}

.kbase-card-emblem {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.kbase-card-emblem--blue   { background: var(--portal-tint-blue);   color: var(--portal-hue-blue); }
.kbase-card-emblem--gold   { background: var(--portal-tint-gold);   color: var(--portal-hue-gold); }
.kbase-card-emblem--green  { background: var(--portal-tint-green);  color: var(--portal-hue-green); }
.kbase-card-emblem--purple { background: var(--portal-tint-purple); color: var(--portal-hue-purple); }
.kbase-card-emblem--teal   { background: var(--portal-tint-teal);   color: var(--portal-hue-teal); }
.kbase-card-emblem--slate  { background: var(--portal-tint-slate);  color: var(--portal-hue-slate); }

.kbase-card-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  padding: var(--spacing-4) var(--spacing-5) var(--spacing-5);
}

.kbase-card-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.kbase-card-title {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
}

.kbase-card-summary {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kbase-card-meta {
  margin-top: var(--spacing-1);
  font-size: var(--font-size-xs);
  color: var(--color-slate-text-muted);
}

/* ========================================
   CATEGORY CHIPS & TAGS
   ======================================== */

.kbase-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-2-5);
  border-radius: var(--radius-full);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
}

.kbase-chip--blue   { background: var(--portal-tint-blue);   color: var(--portal-hue-blue); }
.kbase-chip--gold   { background: var(--portal-tint-gold);   color: var(--portal-hue-gold); }
.kbase-chip--green  { background: var(--portal-tint-green);  color: var(--portal-hue-green); }
.kbase-chip--purple { background: var(--portal-tint-purple); color: var(--portal-hue-purple); }
.kbase-chip--teal   { background: var(--portal-tint-teal);   color: var(--portal-hue-teal); }
.kbase-chip--slate  { background: var(--portal-tint-slate);  color: var(--portal-hue-slate); }

.kbase-chip--pinned {
  background: var(--color-primary);
  color: var(--color-accent-light);
}

/* On navy surfaces the tinted chips vanish; frost keeps them legible there. */
.kbase-chip--frost {
  background: rgba(255, 255, 255, 0.14);
  color: var(--color-white);
}

/* ...and the pinned chip flips to gold so "Wichtig" still pops on navy. */
.kbase-feature .kbase-chip--pinned,
.kbase-reader-head .kbase-chip--pinned {
  background: var(--color-accent);
  color: var(--color-primary-deep);
}

.kbase-tag {
  display: inline-flex;
  padding: var(--spacing-1) var(--spacing-2-5);
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  color: var(--color-gray-600);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-xs);
}

/* ========================================
   READER OVERLAY
   ======================================== */

.kbase-reader-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  justify-content: center;
  padding: var(--spacing-8) var(--spacing-4);
  overflow-y: auto;
  background: rgba(13, 31, 60, 0.55);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  opacity: 0;
  transition: opacity var(--duration-200) var(--ease-in-out);
}

.kbase-reader-overlay.is-open {
  opacity: 1;
}

.kbase-reader {
  position: relative;
  width: 100%;
  max-width: var(--narrow-max-width);
  height: fit-content;
}

.kbase-reader-close {
  position: sticky;
  top: 0;
  float: right;
  margin-left: var(--spacing-3);
  transform: translateY(calc(-1 * var(--spacing-2)));
  width: var(--spacing-11);
  height: var(--spacing-11);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-full);
  background: rgba(16, 39, 76, 0.6);
  color: var(--color-white);
  cursor: pointer;
  z-index: 1;
  transition: var(--transition-colors);
}

.kbase-reader-close:hover {
  background: rgba(16, 39, 76, 0.85);
}

.kbase-reader-close:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

.kbase-reader-article {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  animation: kbaseReaderEntrance var(--duration-300) var(--ease-expo-out) backwards;
}

@keyframes kbaseReaderEntrance {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Navy masthead: the article opens like a title page, not like a form.
   The category emblem sits behind the text as a watermark. */
.kbase-reader-head {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  padding: var(--spacing-8);
  background: var(--gradient-navy-surface);
  color: var(--color-white);
}

.kbase-reader-watermark {
  position: absolute;
  right: calc(-1 * var(--spacing-10));
  bottom: calc(-1 * var(--spacing-12));
  color: rgba(255, 255, 255, 0.07);
  pointer-events: none;
}

.kbase-reader-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.kbase-reader-title {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
}

/* The flex gap owns the rhythm here; base.css paragraph margins would double it. */
.kbase-reader-lede,
.kbase-reader-meta {
  margin: 0;
}

.kbase-reader-lede {
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-md);
  color: rgba(255, 255, 255, 0.85);
  line-height: var(--line-height-relaxed);
}

.kbase-reader-meta {
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.7);
}

.kbase-reader-admin {
  display: flex;
  gap: var(--spacing-2);
  padding-top: var(--spacing-2);
}

/* The outline variant is styled for light surfaces and vanishes on navy. */
.kbase-reader-admin .btn-outline {
  border-color: rgba(255, 255, 255, 0.28);
  color: var(--color-white);
}

.kbase-reader-admin .btn-outline:hover {
  border-color: rgba(255, 255, 255, 0.55);
  background-color: rgba(255, 255, 255, 0.1);
  box-shadow: none;
}

/* ========================================
   CONTENTS STRIP
   ======================================== */

.kbase-reader-toc {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-4);
  padding: var(--spacing-4) var(--spacing-8);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-off-white);
}

.kbase-reader-toc-label {
  flex-shrink: 0;
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  color: var(--color-slate-text-muted);
}

.kbase-reader-toc-list {
  display: flex;
  flex-wrap: wrap;
  column-gap: var(--spacing-5);
  row-gap: var(--spacing-1);
}

.kbase-reader-toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--spacing-1-5);
  padding: var(--spacing-1) 0;
  border: 0;
  background: none;
  cursor: pointer;
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-sm);
  color: var(--color-primary);
}

.kbase-reader-toc-no {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-dark);
}

.kbase-reader-toc-link:hover .kbase-reader-toc-text {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.kbase-reader-toc-link:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

/* ========================================
   READING PROGRESS
   ======================================== */

.kbase-reader-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-dark), var(--color-accent-light));
  transform: scaleX(0);
  transform-origin: left;
  z-index: 2;
}

/* Full-bleed under the masthead; the card's radius clips the corners. */
.kbase-reader-hero {
  margin: 0;
}

.kbase-reader-hero img {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

.kbase-reader-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-5);
  padding: var(--spacing-6) var(--spacing-8);
}

.kbase-reader-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  padding: 0 var(--spacing-8) var(--spacing-8);
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 600px) {
  .kbase-grid {
    grid-template-columns: 1fr;
  }

  /* Aufmacher stacks: media becomes a banner above the text. */
  .kbase-feature {
    grid-template-columns: 1fr;
  }

  .kbase-feature-media {
    order: -1;
    aspect-ratio: 16 / 7;
  }

  .kbase-feature-media:not(.kbase-feature-media--emblem)::after {
    background: linear-gradient(180deg, rgba(16, 39, 76, 0) 55%, var(--color-primary) 100%);
  }

  .kbase-feature-body {
    padding: var(--spacing-5);
  }

  .kbase-reader-overlay {
    padding: var(--spacing-4) var(--spacing-2);
  }

  .kbase-reader-head,
  .kbase-reader-body {
    padding-left: var(--spacing-5);
    padding-right: var(--spacing-5);
  }

  .kbase-reader-toc {
    padding-left: var(--spacing-5);
    padding-right: var(--spacing-5);
  }

  .kbase-reader-tags {
    padding-left: var(--spacing-5);
    padding-right: var(--spacing-5);
  }
}

@media (prefers-reduced-motion: reduce) {
  .kbase-card:hover,
  .kbase-feature:hover,
  .kbase-feature:hover .kbase-feature-cta .icon {
    transform: none;
  }

  .kbase-card:hover .kbase-card-image {
    transform: none;
  }
}

/* ========================================
   FEINSCHLIFF
   ======================================== */

/* Headlines break evenly instead of leaving a lonely word on the last line. */
.kbase-card-title,
.kbase-feature-title,
.kbase-reader-title {
  text-wrap: balance;
}

/* Dates and reading times in meta lines align as tabular digits. */
.kbase-card-meta,
.kbase-feature-meta,
.kbase-reader-meta {
  font-variant-numeric: tabular-nums;
}

/* Category chips get a hairline ring so the tint holds its shape on white. */
.kbase-chip {
  box-shadow: inset 0 0 0 1px rgba(16, 39, 76, 0.06);
}

.kbase-chip--frost,
.kbase-chip--pinned {
  box-shadow: none;
}

/* TOC numbers line up when chapters reach double digits. */
.kbase-reader-toc-no {
  font-variant-numeric: tabular-nums;
}

/* ========================================
   REITER (Artikel / Produktpartner)
   ======================================== */

.kbase-reiter {
  display: flex;
  gap: var(--spacing-1);
  margin-bottom: var(--spacing-5);
  border-bottom: 1px solid var(--color-border);
}

.kbase-reiter-knopf {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  min-height: 44px;
  padding: var(--spacing-2) var(--spacing-4);
  margin-bottom: -1px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: color var(--duration-150) var(--ease-in-out);
}

.kbase-reiter-knopf:hover {
  color: var(--color-text-primary);
}

.kbase-reiter-knopf.is-active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-accent);
}

.kbase-reiter-knopf:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}