/* ===================================================================
   Thought Leadership, page-scoped styles (tl-)
   Listing (/thought-leadership/) + whitepaper detail pages.
   Built on the Symphony design tokens (styles.css). No global edits.
   =================================================================== */
.tl {
  --tl-hair: rgba(168, 85, 247, 0.16);
  --tl-hair2: rgba(168, 85, 247, 0.28);
  position: relative;
  z-index: 1;
  overflow-x: hidden;
}
.tl * { box-sizing: border-box; }
.tl .tl-wrap { max-width: 1140px; margin: 0 auto; padding: 0 28px; }
.tl-hl {
  background: linear-gradient(95deg, #ff7a3d 15%, #d08bff);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.tl .tl-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500;
  color: var(--accent); text-transform: uppercase; letter-spacing: 0.18em; margin-bottom: 20px;
}
.tl .tl-eyebrow::before { content: ''; width: 18px; height: 1px; background: var(--accent); }

/* ---- Hero ---- */
.tl-hero { position: relative; padding: 150px 0 60px; }
.tl-hero::before {
  content: ''; position: absolute; top: -80px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 420px;
  background: radial-gradient(60% 60% at 35% 40%, rgba(255,122,61,0.13), transparent 70%),
              radial-gradient(50% 50% at 72% 50%, rgba(168,85,247,0.1), transparent 70%);
  filter: blur(30px); pointer-events: none; z-index: -1;
}
.tl-hero-c { max-width: 820px; }
.tl-hero h1 {
  font-size: clamp(2.2rem, 4.6vw, 3.4rem); font-weight: 800; line-height: 1.07;
  letter-spacing: -0.04em; margin: 0 0 22px;
}
.tl-hero-lead { font-size: clamp(1.02rem, 1.5vw, 1.18rem); color: var(--text-secondary); line-height: 1.65; max-width: 680px; }
.tl-hero-stat { margin-top: 26px; font-family: var(--font-mono); font-size: 0.74rem; color: var(--text-quaternary); letter-spacing: 0.04em; }

/* ---- Listing section ---- */
.tl-list { padding: 20px 0 110px; }
.tl-list-head { margin-bottom: 34px; }
.tl-list-head .k { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-tertiary); }
.tl-list-head h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); font-weight: 800; letter-spacing: -0.03em; margin: 10px 0 8px; }
.tl-list-head p { font-size: 1rem; color: var(--text-tertiary); line-height: 1.6; max-width: 640px; }

.tl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tl-card {
  display: flex; flex-direction: column; background: var(--bg-card);
  border: 1px solid var(--tl-hair); border-radius: var(--radius-xl);
  padding: 28px 26px; text-decoration: none; color: inherit;
  transition: border-color .2s, transform .2s, box-shadow .2s; position: relative; overflow: hidden;
}
.tl-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--accent), var(--accent-purple)); opacity: 0; transition: opacity .2s; }
.tl-card:hover { border-color: var(--tl-hair2); transform: translateY(-4px); box-shadow: 0 24px 60px rgba(0,0,0,0.4); }
.tl-card:hover::before { opacity: 1; }
.tl-card-cat {
  display: inline-block; align-self: flex-start; font-family: var(--font-mono);
  font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent);
  border: 1px solid var(--border-accent); border-radius: 999px; padding: 4px 11px; margin-bottom: 18px;
}
.tl-card-icon { width: 46px; height: 46px; border-radius: 12px; background: var(--accent-dim); border: 1px solid var(--border-accent); display: flex; align-items: center; justify-content: center; color: var(--accent); margin-bottom: 18px; }
.tl-card h3 { font-size: 1.2rem; font-weight: 700; line-height: 1.3; margin: 0 0 12px; letter-spacing: -0.01em; }
.tl-card p { font-size: 0.92rem; color: var(--text-tertiary); line-height: 1.6; margin: 0 0 18px; }
.tl-card-meta { display: flex; flex-wrap: wrap; gap: 8px 14px; margin-top: auto; font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-quaternary); }
.tl-card-meta span { display: inline-flex; align-items: center; gap: 5px; }
.tl-card-read { margin-top: 16px; font-size: 0.85rem; font-weight: 600; color: var(--accent); display: inline-flex; align-items: center; gap: 6px; }
.tl-empty { grid-column: 1 / -1; text-align: center; color: var(--text-tertiary); padding: 40px 0; }

/* ===================== Whitepaper detail ===================== */
.tl-detail { padding: 130px 0 100px; }
.tl-back { display: inline-flex; align-items: center; gap: 7px; font-size: 0.85rem; color: var(--text-tertiary); text-decoration: none; margin-bottom: 28px; transition: color .2s; }
.tl-back:hover { color: var(--text-primary); }
.tl-detail-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 52px; align-items: start; }
.tl-detail-grid > * { min-width: 0; }

.tl-doc-cat { display: inline-block; font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); border: 1px solid var(--border-accent); border-radius: 999px; padding: 4px 12px; margin-bottom: 18px; }
.tl-doc h1 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); font-weight: 800; line-height: 1.12; letter-spacing: -0.035em; margin: 0 0 18px; }
.tl-doc-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 26px; font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-quaternary); }
.tl-doc-meta span { display: inline-flex; align-items: center; gap: 6px; }
.tl-doc-lead { font-size: 1.1rem; color: var(--text-secondary); line-height: 1.66; margin: 0 0 34px; }
.tl-doc-section { margin-bottom: 30px; }
.tl-doc-section h2 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 10px; }
.tl-doc-section p { font-size: 0.98rem; color: var(--text-tertiary); line-height: 1.7; margin: 0; }

.tl-inside { background: var(--bg-card); border: 1px solid var(--tl-hair); border-radius: var(--radius-lg); padding: 26px 28px; margin: 34px 0; }
.tl-inside h2 { font-size: 1.05rem; font-weight: 700; margin: 0 0 16px; }
.tl-inside ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.tl-inside li { position: relative; padding-left: 28px; font-size: 0.94rem; color: var(--text-secondary); line-height: 1.55; }
.tl-inside li svg { position: absolute; left: 0; top: 2px; color: var(--accent); }

.tl-topics { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.tl-topics span { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-secondary); border: 1px solid var(--tl-hair); border-radius: 999px; padding: 6px 13px; background: var(--bg-card); }

.tl-audience { margin-top: 32px; padding: 18px 22px; background: rgba(168,85,247,0.06); border-left: 2px solid var(--accent-purple); border-radius: var(--radius-sm); }
.tl-audience h2 { font-size: 0.95rem; font-weight: 700; margin: 0 0 6px; }
.tl-audience p { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.6; margin: 0; }

/* ---- Gated form (sticky) ---- */
.tl-form-col { position: sticky; top: 96px; }
.tl-card-form {
  background: linear-gradient(180deg, rgba(28,22,53,0.9), rgba(21,16,41,0.9));
  border: 1px solid var(--tl-hair2); border-radius: var(--radius-xl); padding: 28px 26px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.4);
}
.tl-form-h { font-size: 1.2rem; font-weight: 700; margin: 0 0 6px; }
.tl-form-s { font-size: 0.88rem; color: var(--text-tertiary); line-height: 1.55; margin: 0 0 20px; }
.tl-field { margin-bottom: 13px; }
.tl-field label { display: block; font-size: 0.8rem; font-weight: 500; color: var(--text-secondary); margin-bottom: 7px; }
.tl-field .req { color: var(--accent); }
.tl-field input {
  width: 100%; font-family: var(--font-sans); font-size: 0.92rem; color: var(--text-primary);
  background: rgba(13,10,26,0.6); border: 1px solid var(--tl-hair); border-radius: var(--radius-md);
  padding: 12px 13px; transition: border-color .2s, box-shadow .2s;
}
.tl-field input:focus { outline: none; border-color: var(--border-accent); box-shadow: 0 0 0 3px var(--accent-dim); }
.tl-hp { position: absolute; left: -9999px; opacity: 0; height: 0; }
.tl-block { width: 100%; justify-content: center; margin-top: 6px; }
.tl-err { color: var(--accent-hover); font-size: 0.83rem; display: none; margin: 10px 0 0; }
.tl-err.on { display: block; }
.tl-priv { font-size: 0.74rem; color: var(--text-quaternary); line-height: 1.5; margin-top: 14px; }
.tl-priv a { color: var(--text-tertiary); text-decoration: underline; }

.tl-success { display: none; text-align: center; }
.tl-success.on { display: block; }
.tl-success .ic { width: 50px; height: 50px; border-radius: 50%; background: rgba(45,212,167,0.12); border: 1px solid rgba(45,212,167,0.42); display: inline-flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.tl-success h3 { font-size: 1.15rem; margin: 0 0 8px; }
.tl-success p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.55; margin: 0 0 18px; }

.tl a:focus-visible, .tl button:focus-visible, .tl input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---- Responsive ---- */
@media (max-width: 980px) {
  .tl-grid { grid-template-columns: 1fr 1fr; }
  .tl-detail-grid { grid-template-columns: 1fr; gap: 40px; }
  .tl-form-col { position: static; }
  .tl-card-form { max-width: 460px; }
}
@media (max-width: 640px) {
  .tl-grid { grid-template-columns: 1fr; }
  .tl .tl-wrap { padding: 0 18px; }
  .tl-hero { padding: 128px 0 48px; }
  .tl-detail { padding: 110px 0 80px; }
}
@media (prefers-reduced-motion: reduce) {
  .tl *, .tl *::before, .tl *::after { transition: none !important; animation: none !important; }
}