:root {
  --lc-ink: #22313b;
  --lc-muted: #5f7383;
  --lc-line: #dce8ef;
  --lc-panel: #ffffff;
  --lc-brand: #1d9bf0;
  --lc-brand-dark: #0b7ccc;
  --lc-success: #edf8f1;
  --lc-warm: #fff7ec;
  --lc-shadow: 0 18px 45px rgba(38, 59, 71, 0.08);
}
.lc-hero { position: relative; padding: 148px 0 92px; background: radial-gradient(circle at top right, rgba(0, 173, 181, 0.14), transparent 32%), linear-gradient(180deg, #eef8fb 0%, #ffffff 100%); overflow: hidden; }
.lc-hero::after { content: ""; position: absolute; inset: auto -5% -80px auto; width: 380px; height: 380px; background: radial-gradient(circle, rgba(29, 155, 240, 0.12) 0%, rgba(29, 155, 240, 0) 70%); pointer-events: none; }
.lc-breadcrumb { display: inline-flex; gap: 8px; align-items: center; margin-bottom: 18px; padding: 9px 14px; border: 1px solid rgba(29, 155, 240, 0.16); border-radius: 999px; background: rgba(255, 255, 255, 0.9); color: var(--lc-muted); font-size: 14px; font-weight: 600; }
.lc-breadcrumb a { color: var(--lc-brand-dark); }
.lc-hero .ud-hero-title, .lc-hero h1 { max-width: 920px; margin-bottom: 18px; color: var(--lc-ink); font-size: clamp(2.4rem, 4vw, 4.25rem); line-height: 1.08; }
.lc-hero .ud-hero-desc { max-width: 780px; margin-bottom: 20px; color: var(--lc-muted); font-size: 1.15rem; line-height: 1.75; }
.lc-lesson-nav, .lc-chip-row { display: flex; flex-wrap: wrap; gap: 12px; }
.lc-chip, .lc-lesson-nav a { display: inline-flex; align-items: center; border-radius: 999px; background: #fff; border: 1px solid var(--lc-line); box-shadow: 0 10px 24px rgba(38, 59, 71, 0.05); }
.lc-chip { padding: 10px 14px; color: var(--lc-brand-dark); font-size: 14px; font-weight: 600; background: #eef7ff; border-color: rgba(29, 155, 240, 0.18); box-shadow: none; }
.lc-lesson-nav { margin-top: 28px; }
.lc-lesson-nav a { padding: 12px 18px; color: var(--lc-ink); text-decoration: none; font-weight: 700; }
.lc-lesson-nav a.active, .lc-lesson-nav a:hover { color: #fff; background: linear-gradient(135deg, var(--lc-brand) 0%, #2cb3ff 100%); border-color: transparent; }
.lc-content { padding: 38px 0 96px; }
.lc-main-card, .lc-side-card, .lc-module-card, .lc-highlight-grid article { background: var(--lc-panel); border: 1px solid var(--lc-line); border-radius: 22px; box-shadow: var(--lc-shadow); }
.lc-main-card { padding: 42px; }
.lc-main-card h2 { margin-top: 40px; margin-bottom: 14px; color: var(--lc-ink); font-size: 1.9rem; line-height: 1.2; }
.lc-main-card h3 { margin-top: 28px; margin-bottom: 10px; color: var(--lc-ink); font-size: 1.25rem; }
.lc-main-card p, .lc-main-card li, .lc-side-card li, .lc-module-card p, .lc-highlight-grid p { color: var(--lc-muted); font-size: 1.02rem; line-height: 1.8; }
.lc-main-card ul, .lc-main-card ol, .lc-side-card ul { padding-left: 22px; }
.lc-main-card li, .lc-side-card li { margin-bottom: 12px; }
.lc-side-card { padding: 28px; margin-bottom: 22px; }
.lc-side-card h4 { margin-bottom: 14px; color: var(--lc-ink); font-size: 1.15rem; }
.lc-callout { margin-top: 28px; padding: 22px 24px; border-radius: 18px; border: 1px solid rgba(29, 155, 240, 0.15); background: linear-gradient(180deg, #f4fbff 0%, #edf7ff 100%); }
.lc-callout strong { display: block; margin-bottom: 8px; color: var(--lc-ink); font-size: 1rem; }
.lc-callout.success { background: linear-gradient(180deg, #f4fbf6 0%, var(--lc-success) 100%); border-color: rgba(31, 157, 85, 0.16); }
.lc-callout.warm { background: linear-gradient(180deg, #fffaf2 0%, var(--lc-warm) 100%); border-color: rgba(210, 129, 37, 0.15); }
.lc-highlight-grid, .lc-module-grid { display: grid; gap: 20px; margin-top: 26px; }
.lc-highlight-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.lc-module-grid { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); margin-top: 30px; }
.lc-highlight-grid article, .lc-module-card { padding: 24px; }
.lc-module-card a { color: var(--lc-ink); text-decoration: none; }
.lc-module-card a:hover { color: var(--lc-brand-dark); }
.lc-table-wrap { margin-top: 26px; overflow-x: auto; border-radius: 18px; border: 1px solid var(--lc-line); background: #fff; }
.lc-table { width: 100%; min-width: 620px; border-collapse: collapse; }
.lc-table th, .lc-table td { padding: 16px 18px; border-bottom: 1px solid var(--lc-line); vertical-align: top; text-align: left; }
.lc-table th { background: #f6fafc; color: var(--lc-ink); font-size: 0.96rem; }
.lc-table td { color: var(--lc-muted); line-height: 1.7; }
.lc-checklist { list-style: none; padding-left: 0; margin-top: 22px; }
.lc-checklist li { position: relative; padding-left: 34px; margin-bottom: 14px; }
.lc-checklist li::before { content: "\ea55"; font-family: "LineIcons"; position: absolute; left: 0; top: 3px; color: var(--lc-brand); font-size: 18px; }
.lc-section-label { display: inline-block; margin-bottom: 14px; color: var(--lc-brand-dark); font-size: 13px; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
@media (max-width: 991px) { .lc-hero { padding: 132px 0 74px; } .lc-main-card { padding: 28px 22px; } .lc-main-card h2 { font-size: 1.55rem; } }