/* =============================================================================
   /learn/ + /tools/ Shared Design System
   learn-tools-shared.css — v1.0.0

   Consumed by:
     - /learn/index.php         (hub)
     - /learn/article.php       (article pages)
     - /tools/index.php         (tools hub)
     - /tools/tool.php          (individual tool pages)

   Fonts loaded externally (one link tag per page):
     Bebas Neue | Outfit 300–700 | DM Mono 400–500 | Source Serif Pro 400,600
   ============================================================================= */

/* ── CSS Variables ─────────────────────────────────────────────────────────── */
:root {
  --lt-bg:           #0b0f1c;
  --lt-bg-elev:      #0f1525;
  --lt-bg-deeper:    #070b17;
  --lt-bg-dim:       rgba(245, 158, 11, 0.06);
  --lt-border:       rgba(148, 163, 184, 0.12);
  --lt-border-strong:rgba(148, 163, 184, 0.22);
  --lt-border-amber: rgba(245, 158, 11, 0.28);
  --lt-text:         #e2e8f0;
  --lt-text-muted:   #94a3b8;
  --lt-text-dim:     #64748b;
  --lt-amber:        #f59e0b;
  --lt-amber-bright: #fbbf24;
  --lt-amber-dim:    rgba(245, 158, 11, 0.12);
  --lt-green:        #22c55e;
  --lt-green-dim:    rgba(34, 197, 94, 0.12);
  --lt-blue:         #3b82f6;
  --lt-blue-dim:     rgba(59, 130, 246, 0.12);
  --lt-container:    1200px;
  --lt-radius:       0px; /* sharp-cornered per brand aesthetic */
}

/* ── Page base ─────────────────────────────────────────────────────────────── */
.lt-page {
  background: var(--lt-bg);
  color:      var(--lt-text);
  font-family: 'Outfit', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.lt-page-bg {
  position: relative;
  background-image:
    radial-gradient(ellipse at 20% 0%,   rgba(245, 158, 11, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 100%, rgba(245, 158, 11, 0.04) 0%, transparent 55%);
  padding: 0 0 80px;
}

.lt-wrap {
  max-width: var(--lt-container);
  margin:    0 auto;
  padding:   0 20px;
}

/* ── Breadcrumb strip ──────────────────────────────────────────────────────── */
.lt-breadcrumb {
  background:   var(--lt-bg-deeper);
  border-bottom: 1px solid var(--lt-border);
  padding:      10px 0;
}

.lt-breadcrumb-inner {
  max-width:   var(--lt-container);
  margin:      0 auto;
  padding:     0 20px;
  display:     flex;
  align-items: center;
  gap:         0;
  list-style:  none;
  font-family: 'DM Mono', monospace;
  font-size:   11px;
  letter-spacing: 0.08em;
  color:       var(--lt-text-dim);
}

.lt-breadcrumb-inner a {
  color:           var(--lt-text-muted);
  text-decoration: none;
  transition:      color 0.15s;
}

.lt-breadcrumb-inner a:hover { color: var(--lt-amber); }

.lt-breadcrumb-inner .sep {
  margin:  0 10px;
  opacity: 0.5;
}

.lt-breadcrumb-inner .current { color: var(--lt-text); }

/* ── Hero ──────────────────────────────────────────────────────────────────── */
.lt-hero {
  padding:       48px 0 40px;
}

.lt-hero-tag {
  display:      inline-block;
  font-family:  'DM Mono', monospace;
  font-size:    11px;
  letter-spacing: 0.2em;
  color:        var(--lt-amber);
  text-transform: uppercase;
  margin-bottom: 18px;
  padding:      4px 10px;
  border:       1px solid var(--lt-border-amber);
  background:   var(--lt-amber-dim);
}

.lt-hero h1,
.lt-hero-h1 {
  font-family:  'Bebas Neue', sans-serif;
  font-size:    clamp(56px, 11vw, 128px);
  letter-spacing: 0.015em;
  line-height:  0.9;
  margin-bottom: 20px;
  color:        var(--lt-text);
}

.lt-hero h1 .amber,
.lt-hero-h1 .amber { color: var(--lt-amber); }

.lt-hero p,
.lt-hero-desc {
  color:       var(--lt-text-muted);
  font-size:   16px;
  max-width:   640px;
  line-height: 1.65;
}

/* ── Status chips ──────────────────────────────────────────────────────────── */
.lt-chip {
  display:      inline-block;
  padding:      3px 8px;
  font-family:  'DM Mono', monospace;
  font-size:    9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border:       1px solid;
  font-weight:  500;
  white-space:  nowrap;
}

.lt-chip.article {
  color:        var(--lt-blue);
  border-color: var(--lt-blue);
  background:   var(--lt-blue-dim);
}

.lt-chip.tool {
  color:        var(--lt-amber);
  border-color: var(--lt-amber);
  background:   var(--lt-amber-dim);
}

.lt-chip.live {
  color:        var(--lt-green);
  border-color: var(--lt-green);
  background:   var(--lt-green-dim);
}

.lt-chip.difficulty {
  color:        var(--lt-text-dim);
  border-color: var(--lt-border-strong);
  background:   transparent;
}

/* ── Category header ───────────────────────────────────────────────────────── */
.lt-category {
  margin-bottom: 48px;
}

.lt-category-header {
  display:         flex;
  align-items:     flex-end;
  justify-content: space-between;
  gap:             24px;
  margin-bottom:   24px;
  padding-bottom:  16px;
  border-bottom:   1px solid var(--lt-border);
  flex-wrap:       wrap;
}

.lt-category-title {
  font-family:    'Bebas Neue', sans-serif;
  font-size:      36px;
  letter-spacing: 0.04em;
  line-height:    1;
  color:          var(--lt-text);
}

.lt-category-title .accent {
  color:          var(--lt-amber);
  font-family:    'DM Mono', monospace;
  font-size:      11px;
  letter-spacing: 0.2em;
  margin-right:   14px;
  vertical-align: middle;
}

.lt-category-count {
  font-family:    'DM Mono', monospace;
  font-size:      11px;
  letter-spacing: 0.18em;
  color:          var(--lt-text-dim);
  text-transform: uppercase;
  white-space:    nowrap;
}

.lt-category-count a {
  color:           var(--lt-amber);
  text-decoration: none;
}

.lt-category-count a:hover { text-decoration: underline; }

/* ── Resource card (unified — articles AND tools) ──────────────────────────── */
.lt-resource-card {
  display:        grid;
  grid-template-columns: 240px 1fr auto;
  gap:            0;
  align-items:    stretch;
  background:     var(--lt-bg-elev);
  border:         1px solid var(--lt-border);
  margin-bottom:  14px;
  text-decoration: none;
  color:          inherit;
  transition:     border-color 0.2s ease;
  position:       relative;
  overflow:       hidden;
  min-height:     170px;
}

.lt-resource-card:hover          { border-color: var(--lt-border-amber); }
.lt-resource-card.lt-card--soon  { cursor: default; opacity: 0.7; }
.lt-resource-card.lt-card--soon:hover { border-color: var(--lt-border); }

@media (max-width: 820px) {
  .lt-resource-card {
    grid-template-columns: 1fr;
    min-height: auto;
  }
}

/* Image/placeholder column */
.lt-card-image {
  position:   relative;
  overflow:   hidden;
  background: var(--lt-bg-deeper);
}

.lt-card-image img {
  width:      100%;
  height:     100%;
  object-fit: cover;
  object-position: top center;
  display:    block;
  transition: transform 0.4s ease;
  -webkit-mask-image: linear-gradient(to right, black 55%, transparent 100%);
  mask-image:         linear-gradient(to right, black 55%, transparent 100%);
}

@media (max-width: 820px) {
  .lt-card-image        { height: 160px; width: 100%; }
  .lt-card-image img {
    -webkit-mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
    mask-image:         linear-gradient(to bottom, black 60%, transparent 100%);
  }
}

.lt-resource-card:not(.lt-card--soon):hover .lt-card-image img {
  transform: scale(1.03);
}

/* Placeholder treatment */
.lt-card-image.placeholder {
  background: linear-gradient(135deg, var(--lt-bg-elev) 0%, var(--lt-bg-deeper) 100%);
  display:    flex;
  align-items: center;
  justify-content: center;
}

.lt-card-image.placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    transparent 0, transparent 12px,
    rgba(148, 163, 184, 0.04) 12px, rgba(148, 163, 184, 0.04) 13px
  );
}

.lt-card-image.placeholder .lt-icon-wrap {
  width:      52px;
  height:     52px;
  display:    flex;
  align-items: center;
  justify-content: center;
  background: var(--lt-amber-dim);
  border:     1px solid var(--lt-border-amber);
  color:      var(--lt-amber);
  position:   relative;
  z-index:    1;
}

.lt-card-image.placeholder .lt-icon-wrap svg {
  width:        50%;
  height:       50%;
  stroke-width: 1.5;
}

/* Content column */
.lt-card-content {
  padding:        22px 8px 22px 0;
  display:        flex;
  flex-direction: column;
  justify-content: center;
  min-width:      0;
}

@media (max-width: 820px) {
  .lt-card-content { padding: 22px 24px 8px 24px; }
}

.lt-card-content .lt-chip-row {
  display:       flex;
  gap:           6px;
  margin-bottom: 10px;
  flex-wrap:     wrap;
}

.lt-card-content .lt-card-title {
  font-family:    'Bebas Neue', sans-serif;
  font-size:      26px;
  letter-spacing: 0.025em;
  line-height:    1.1;
  margin-bottom:  8px;
  color:          var(--lt-text);
}

.lt-card-content .lt-card-desc {
  font-size:     13.5px;
  color:         var(--lt-text-muted);
  line-height:   1.6;
  margin-bottom: 10px;
  max-width:     560px;
}

.lt-card-content .lt-meta-row {
  display:        flex;
  gap:            20px;
  flex-wrap:      wrap;
  font-family:    'DM Mono', monospace;
  font-size:      10.5px;
  letter-spacing: 0.1em;
  color:          var(--lt-text-dim);
  text-transform: uppercase;
}

.lt-card-content .lt-meta-item {
  display:     flex;
  align-items: center;
  gap:         5px;
}

/* Action column */
.lt-card-action {
  display:     flex;
  align-items: center;
  padding:     22px 26px 22px 12px;
}

@media (max-width: 820px) {
  .lt-card-action {
    padding:        4px 24px 20px 24px;
    justify-content: flex-start;
  }
}

.lt-action-btn {
  padding:        9px 16px;
  font-family:    'DM Mono', monospace;
  font-size:      11px;
  letter-spacing: 0.14em;
  color:          var(--lt-amber);
  text-transform: uppercase;
  border:         1px solid var(--lt-amber);
  background:     var(--lt-amber-dim);
  transition:     all 0.15s;
  display:        flex;
  align-items:    center;
  gap:            8px;
  white-space:    nowrap;
}

.lt-resource-card:not(.lt-card--soon):hover .lt-action-btn {
  background: var(--lt-amber);
  color:      var(--lt-bg-deeper);
}

.lt-action-btn .lt-arrow { transition: transform 0.2s ease; }

.lt-resource-card:not(.lt-card--soon):hover .lt-action-btn .lt-arrow {
  transform: translateX(3px);
}

/* ── Cross-section CTA block ───────────────────────────────────────────────── */
.lt-cross-cta {
  margin:      56px 0 48px;
  background:  linear-gradient(135deg, var(--lt-bg-elev) 0%, rgba(245, 158, 11, 0.04) 100%);
  border:      1px solid var(--lt-border);
  border-left: 3px solid var(--lt-amber);
  padding:     32px 36px;
  display:     grid;
  grid-template-columns: auto 1fr auto;
  gap:         28px;
  align-items: center;
}

@media (max-width: 720px) {
  .lt-cross-cta {
    grid-template-columns: 1fr;
    gap:     20px;
    padding: 24px;
  }
}

.lt-cross-cta .lt-cta-icon {
  width:       80px;
  height:      80px;
  background:  var(--lt-amber-dim);
  border:      1px solid var(--lt-border-amber);
  color:       var(--lt-amber);
  display:     flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.lt-cross-cta .lt-cta-icon svg {
  width:        40px;
  height:       40px;
  stroke-width: 1.6;
}

.lt-cross-cta .lt-cta-label {
  font-family:    'DM Mono', monospace;
  font-size:      10.5px;
  letter-spacing: 0.2em;
  color:          var(--lt-amber);
  text-transform: uppercase;
  margin-bottom:  6px;
  font-weight:    500;
}

.lt-cross-cta h3 {
  font-family:    'Bebas Neue', sans-serif;
  font-size:      32px;
  letter-spacing: 0.03em;
  line-height:    1.1;
  color:          var(--lt-text);
  margin-bottom:  8px;
}

.lt-cross-cta p {
  color:       var(--lt-text-muted);
  font-size:   14px;
  line-height: 1.6;
  max-width:   560px;
  margin:      0;
}

.lt-cross-cta-btn {
  padding:        12px 22px;
  font-family:    'DM Mono', monospace;
  font-size:      11.5px;
  letter-spacing: 0.14em;
  color:          var(--lt-bg-deeper);
  text-transform: uppercase;
  border:         1px solid var(--lt-amber);
  background:     var(--lt-amber);
  transition:     all 0.15s;
  display:        inline-flex;
  align-items:    center;
  gap:            8px;
  white-space:    nowrap;
  text-decoration: none;
  font-weight:    500;
}

.lt-cross-cta-btn:hover {
  background:   var(--lt-amber-bright);
  border-color: var(--lt-amber-bright);
}

.lt-cross-cta-btn .lt-arrow { transition: transform 0.2s ease; }
.lt-cross-cta-btn:hover .lt-arrow { transform: translateX(3px); }

/* ── Inline tool callout (inside article body) ─────────────────────────────── */
.lt-inline-callout {
  margin:      36px 0;
  background:  var(--lt-bg-elev);
  border:      1px solid var(--lt-border);
  border-left: 3px solid var(--lt-amber);
  padding:     22px 26px;
  display:     grid;
  grid-template-columns: auto 1fr auto;
  gap:         22px;
  align-items: center;
  font-family: 'Outfit', sans-serif;
  font-size:   15px;
  line-height: 1.55;
}

@media (max-width: 640px) {
  .lt-inline-callout { grid-template-columns: 1fr; gap: 14px; }
}

.lt-inline-callout .lt-cta-icon {
  width:       56px;
  height:      56px;
  background:  var(--lt-amber-dim);
  border:      1px solid var(--lt-border-amber);
  color:       var(--lt-amber);
  display:     flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.lt-inline-callout .lt-cta-icon svg {
  width:        50%;
  height:       50%;
  stroke-width: 1.6;
}

.lt-inline-callout .lt-cta-label {
  font-family:    'DM Mono', monospace;
  font-size:      9.5px;
  letter-spacing: 0.2em;
  color:          var(--lt-amber);
  text-transform: uppercase;
  margin-bottom:  4px;
  font-weight:    500;
}

.lt-inline-callout h4 {
  font-family:    'Bebas Neue', sans-serif;
  font-size:      22px;
  letter-spacing: 0.03em;
  color:          var(--lt-text);
  margin-bottom:  4px;
  line-height:    1.1;
  font-weight:    400;
}

.lt-inline-callout p {
  font-size:   13px;
  color:       var(--lt-text-muted);
  line-height: 1.55;
  margin:      0;
}

.lt-inline-btn {
  padding:        10px 18px;
  font-family:    'DM Mono', monospace;
  font-size:      11px;
  letter-spacing: 0.14em;
  color:          var(--lt-amber);
  text-transform: uppercase;
  border:         1px solid var(--lt-amber);
  background:     var(--lt-amber-dim);
  transition:     all 0.15s;
  display:        flex;
  align-items:    center;
  gap:            8px;
  white-space:    nowrap;
  text-decoration: none;
  font-weight:    500;
}

.lt-inline-btn:hover {
  background:     var(--lt-amber);
  color:          var(--lt-bg-deeper);
  text-decoration: none;
}

.lt-inline-btn .lt-arrow { transition: transform 0.2s ease; }
.lt-inline-btn:hover .lt-arrow { transform: translateX(3px); }

/* ── Related section (bottom of article or tool page) ──────────────────────── */
.lt-related-section {
  margin-top:    72px;
  padding-top:   40px;
  border-top:    1px solid var(--lt-border);
}

.lt-related-title {
  font-family:    'Bebas Neue', sans-serif;
  font-size:      28px;
  letter-spacing: 0.03em;
  color:          var(--lt-text);
  margin-bottom:  20px;
  font-weight:    400;
}

.lt-related-title .amber { color: var(--lt-amber); }

/* ── Compact article card (related articles grid on tool pages) ─────────────── */
.lt-compact-grid {
  display:               grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap:                   14px;
  margin-bottom:         32px;
}

.lt-compact-card {
  background:     var(--lt-bg-elev);
  border:         1px solid var(--lt-border);
  padding:        22px;
  text-decoration: none;
  color:          inherit;
  transition:     border-color 0.2s ease, background 0.2s ease;
  display:        flex;
  flex-direction: column;
}

.lt-compact-card:hover {
  border-color: var(--lt-border-amber);
  background:   var(--lt-bg-dim);
}

.lt-compact-card .lt-chip-row {
  display:       flex;
  gap:           6px;
  margin-bottom: 12px;
}

.lt-compact-card .lt-compact-title {
  font-family:    'Bebas Neue', sans-serif;
  font-size:      22px;
  letter-spacing: 0.025em;
  line-height:    1.1;
  margin-bottom:  10px;
  color:          var(--lt-text);
  font-weight:    400;
}

.lt-compact-card .lt-compact-desc {
  font-size:     12.5px;
  color:         var(--lt-text-muted);
  line-height:   1.55;
  margin-bottom: 16px;
  flex:          1;
}

.lt-compact-card .lt-read-cta {
  font-family:    'DM Mono', monospace;
  font-size:      10.5px;
  letter-spacing: 0.14em;
  color:          var(--lt-amber);
  text-transform: uppercase;
  display:        flex;
  align-items:    center;
  gap:            6px;
  margin-top:     auto;
  text-decoration: none;
}

.lt-compact-card .lt-read-cta .lt-arrow { transition: transform 0.2s ease; }
.lt-compact-card:hover .lt-read-cta .lt-arrow { transform: translateX(3px); }

/* ── Article page — dark serif layout ──────────────────────────────────────── */
.lt-article-wrap {
  max-width: 800px;
  margin:    0 auto;
  padding:   40px 20px 0;
}

.lt-article-meta {
  display:        flex;
  gap:            16px;
  flex-wrap:      wrap;
  font-family:    'DM Mono', monospace;
  font-size:      11px;
  letter-spacing: 0.12em;
  color:          var(--lt-text-dim);
  text-transform: uppercase;
  margin-bottom:  16px;
  align-items:    center;
}

.lt-article-title {
  font-family:    'Bebas Neue', sans-serif;
  font-size:      clamp(42px, 7vw, 68px);
  letter-spacing: 0.02em;
  line-height:    1;
  margin-bottom:  20px;
  color:          var(--lt-text);
  font-weight:    400;
}

.lt-article-title .amber { color: var(--lt-amber); }

.lt-article-lead {
  font-family:   'Source Serif Pro', Georgia, serif;
  font-size:     19px;
  line-height:   1.65;
  color:         var(--lt-text);
  margin-bottom: 36px;
  border-left:   3px solid var(--lt-amber);
  padding-left:  20px;
}

.lt-article-body {
  font-family: 'Source Serif Pro', Georgia, serif;
  font-size:   17px;
  line-height: 1.75;
  color:       var(--lt-text);
}

.lt-article-body h2 {
  font-family:    'Bebas Neue', sans-serif;
  font-size:      32px;
  letter-spacing: 0.03em;
  color:          var(--lt-text);
  margin:         44px 0 18px;
  line-height:    1.1;
  font-weight:    400;
}

.lt-article-body h2 .accent { color: var(--lt-amber); }

.lt-article-body p        { margin-bottom: 22px; }
.lt-article-body p strong { color: var(--lt-amber-bright); font-weight: 600; }

.lt-article-body a {
  color:                   var(--lt-amber);
  text-decoration:         underline;
  text-decoration-color:   var(--lt-border-amber);
  text-underline-offset:   3px;
}

.lt-article-body ul,
.lt-article-body ol {
  padding-left:  1.5em;
  margin-bottom: 22px;
}

.lt-article-body li { margin-bottom: 8px; }

.lt-article-hero {
  width:         100%;
  aspect-ratio:  16/9;
  background:    linear-gradient(135deg, #1a2138 0%, #0b0f1c 100%);
  margin-bottom: 36px;
  display:       flex;
  align-items:   center;
  justify-content: center;
  border:        1px solid var(--lt-border);
  position:      relative;
  overflow:      hidden;
}

.lt-article-hero img {
  width:      100%;
  height:     100%;
  object-fit: cover;
}

/* ── Utility: visually-hidden H1 for article dark theme ────────────────────── */
/* Tools that already have a visual H1 in their HTML can hide the page-level one */
.lt-h1-hidden {
  position: absolute;
  width:    1px;
  height:   1px;
  overflow: hidden;
  clip:     rect(0,0,0,0);
}