:root {
  --bc-ai-ink: #f3f5ff;
  --bc-ai-muted: #aeb6ca;
  --bc-ai-line: rgba(162, 177, 230, .18);
  --bc-ai-violet: #a78bfa;
  --bc-ai-teal: #5eead4;
  --bc-ai-panel: #0c1325;
}

body.bc-course-document .bc-course-shell { max-width: 1320px; }
.bc-ai-page { color: var(--bc-ai-ink); }
.bc-ai-hero { position: relative; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(360px, .92fr); min-height: 630px; overflow: hidden; border: 1px solid var(--bc-ai-line); border-radius: 22px; background: radial-gradient(circle at 66% 21%, rgba(111, 76, 190, .24), transparent 31%), linear-gradient(118deg, #071026 0%, #050914 58%, #080a12 100%); }
.bc-ai-hero-copy { position: relative; z-index: 1; display: flex; flex-direction: column; justify-content: center; padding: 72px clamp(34px, 5.1vw, 78px); }
.bc-ai-kicker, .bc-ai-section-head > p { margin: 0; color: var(--bc-ai-violet); font: 700 12px/1.2 "JetBrains Mono", "SFMono-Regular", Consolas, monospace; letter-spacing: .16em; }
.bc-ai-hero h1 { max-width: 690px; margin: 24px 0 0; font-size: clamp(42px, 4.2vw, 64px); font-weight: 700; line-height: 1.11; letter-spacing: -.065em; word-break: keep-all; }
.bc-ai-hero h1 em { color: var(--bc-ai-violet); font-style: normal; }
.bc-ai-hero-lead { max-width: 590px; margin: 26px 0 0; color: #d2d8e8; font-size: 18px; line-height: 1.8; word-break: keep-all; }
.bc-ai-contact { margin-top: 31px; }
.bc-ai-contact > p { margin: 0 0 13px; color: var(--bc-ai-muted); font-size: 14px; }
.bc-ai-contact-actions { display: flex; flex-wrap: wrap; gap: 9px; }
.bc-ai-contact-button { display: inline-flex; align-items: center; min-height: 48px; gap: 8px; padding: 7px 13px 7px 8px; border: 1px solid rgba(255,255,255,.15); border-radius: 12px; background: rgba(6, 11, 25, .68); color: var(--bc-ai-ink); font: 700 13px/1 Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; cursor: pointer; transition: border-color .18s ease, transform .18s ease, background .18s ease; }
.bc-ai-contact-button:hover, .bc-ai-contact-button:focus-visible { border-color: rgba(167, 139, 250, .8); background: rgba(39, 29, 71, .72); color: #fff; outline: none; transform: translateY(-2px); }
.bc-ai-contact-button:active { transform: translateY(0); }
.bc-ai-contact-button img { width: 32px; height: 32px; object-fit: contain; }
.bc-ai-contact-button .fa-weixin { display: grid; width: 32px; height: 32px; place-items: center; border-radius: 50%; background: #07c160; color: #fff; font-size: 19px; }
.bc-ai-hero-visual { position: relative; min-height: 100%; margin: 0; background: #060914; }
.bc-ai-hero-visual::after { position: absolute; inset: 0; background: linear-gradient(90deg, #071026 0%, rgba(7,16,38,.28) 16%, transparent 45%), linear-gradient(0deg, rgba(3,6,14,.36), transparent 44%); content: ""; pointer-events: none; }
.bc-ai-hero-visual img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: 51% 50%; }

.bc-ai-features { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; border-bottom: 1px solid var(--bc-ai-line); }
.bc-ai-features article { min-height: 205px; padding: 38px 28px 34px; border-right: 1px solid var(--bc-ai-line); }
.bc-ai-features article:last-child { border-right: 0; }
.bc-ai-features i { color: var(--bc-ai-teal); font-size: 26px; }
.bc-ai-features h2 { margin: 26px 0 0; font-size: 18px; line-height: 1.25; letter-spacing: -.035em; }
.bc-ai-features p { margin: 11px 0 0; color: var(--bc-ai-muted); font-size: 14px; line-height: 1.65; word-break: keep-all; }

.bc-ai-section { margin-top: 112px; }
.bc-ai-section-head { margin-bottom: 32px; }
.bc-ai-section-head h2 { margin: 12px 0 0; color: var(--bc-ai-ink); font-size: clamp(32px, 3.1vw, 44px); line-height: 1.15; letter-spacing: -.06em; word-break: keep-all; }
.bc-ai-section-head > span { display: block; max-width: 650px; margin-top: 16px; color: var(--bc-ai-muted); font-size: 16px; line-height: 1.75; word-break: keep-all; }
.bc-ai-learning-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.bc-ai-learning-card { position: relative; min-height: 278px; padding: 31px 32px; border: 1px solid rgba(139, 157, 218, .24); border-radius: 17px; background: rgba(4, 9, 23, .46); transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease; }
.bc-ai-learning-card:hover { border-color: rgba(167, 139, 250, .7); box-shadow: 0 16px 30px rgba(0,0,0,.2); transform: translateY(-2px); }
.bc-ai-learning-card--agent { grid-column: 1 / -1; min-height: 230px; }
.bc-ai-learning-card > span { color: var(--bc-ai-violet); font: 700 12px/1 "JetBrains Mono", "SFMono-Regular", Consolas, monospace; letter-spacing: .1em; }
.bc-ai-learning-card > i { position: absolute; top: 28px; right: 29px; color: var(--bc-ai-teal); font-size: 31px; }
.bc-ai-learning-card h3 { margin: 28px 0 0; font-size: 22px; line-height: 1.25; letter-spacing: -.04em; word-break: keep-all; }
.bc-ai-learning-card p { max-width: 500px; margin: 15px 0 0; color: var(--bc-ai-muted); font-size: 14px; line-height: 1.72; word-break: keep-all; }
.bc-ai-learning-card p + p { margin-top: 8px; color: #d2d9ec; }

.bc-ai-audience-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.bc-ai-audience-card { padding: 38px; border: 1px solid var(--bc-ai-line); border-radius: 20px; background: #0a1020; }
.bc-ai-audience-card > i { color: var(--bc-ai-violet); font-size: 32px; }
.bc-ai-audience-card--work > i { color: var(--bc-ai-teal); }
.bc-ai-audience-card h3 { margin: 24px 0 0; font-size: 25px; letter-spacing: -.045em; }
.bc-ai-audience-card ul { display: grid; gap: 15px; margin: 27px 0 0; padding: 0; list-style: none; }
.bc-ai-audience-card li { position: relative; padding-left: 22px; color: var(--bc-ai-muted); font-size: 15px; line-height: 1.65; word-break: keep-all; }
.bc-ai-audience-card li::before { position: absolute; top: .58em; left: 0; width: 8px; height: 8px; border: 2px solid var(--bc-ai-violet); border-top: 0; border-left: 0; content: ""; transform: rotate(45deg); }
.bc-ai-audience-card--work li::before { border-color: var(--bc-ai-teal); }

.bc-ai-level-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.bc-ai-level-card { display: flex; flex-direction: column; min-height: 420px; padding: 30px; border: 1px solid var(--bc-ai-line); border-radius: 18px; background: #0a1020; }
.bc-ai-level-card > span { color: var(--bc-ai-violet); font: 700 11px/1 "JetBrains Mono", "SFMono-Regular", Consolas, monospace; letter-spacing: .12em; }
.bc-ai-level-card h3 { margin: 21px 0 0; font: 700 24px/1.15 "JetBrains Mono", "SFMono-Regular", Consolas, monospace; letter-spacing: -.07em; }
.bc-ai-level-card > p { min-height: 44px; margin: 17px 0 0; color: #d6dced; font-size: 15px; line-height: 1.55; word-break: keep-all; }
.bc-ai-level-card ul { display: grid; gap: 9px; margin: 23px 0 0; padding: 19px 0 0; border-top: 1px solid var(--bc-ai-line); list-style: none; }
.bc-ai-level-card li { color: var(--bc-ai-muted); font-size: 14px; line-height: 1.45; }
.bc-ai-level-card li::before { margin-right: 8px; color: var(--bc-ai-teal); content: "•"; }
.bc-ai-level-card small { margin-top: auto; padding-top: 22px; color: var(--bc-ai-teal); font-size: 12px; line-height: 1.4; word-break: keep-all; }

.bc-ai-flow ol { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; padding: 0; border-top: 1px solid var(--bc-ai-line); list-style: none; }
.bc-ai-flow li { position: relative; min-height: 204px; padding: 29px 25px 25px; border-right: 1px solid var(--bc-ai-line); }
.bc-ai-flow li:last-child { border-right: 0; }
.bc-ai-flow li:not(:last-child)::after { position: absolute; top: 38px; right: -5px; z-index: 1; width: 9px; height: 9px; border-top: 1px solid var(--bc-ai-teal); border-right: 1px solid var(--bc-ai-teal); background: #08080a; content: ""; transform: rotate(45deg); }
.bc-ai-flow span { color: var(--bc-ai-teal); font: 700 12px/1 "JetBrains Mono", "SFMono-Regular", Consolas, monospace; }
.bc-ai-flow h3 { margin: 25px 0 0; font-size: 18px; letter-spacing: -.04em; }
.bc-ai-flow p { margin: 11px 0 0; color: var(--bc-ai-muted); font-size: 14px; line-height: 1.65; word-break: keep-all; }

.bc-ai-cta { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 34px; align-items: end; margin-top: 112px; padding: 57px clamp(28px, 5vw, 70px); border: 1px solid rgba(167, 139, 250, .34); border-radius: 22px; background: radial-gradient(circle at 78% 35%, rgba(126, 91, 218, .28), transparent 32%), #0c1325; }
.bc-ai-cta h2 { max-width: 720px; margin: 0; font-size: clamp(28px, 3.1vw, 42px); line-height: 1.24; letter-spacing: -.06em; word-break: keep-all; }
.bc-ai-cta p { max-width: 610px; margin: 18px 0 0; color: #c9d0e2; font-size: 16px; line-height: 1.7; word-break: keep-all; }
.bc-ai-contact-actions--footer { justify-content: flex-end; }

@media (max-width: 991px) {
  .bc-ai-hero { grid-template-columns: 1fr; }
  .bc-ai-hero-copy { min-height: 520px; }
  .bc-ai-hero-visual { min-height: 430px; }
  .bc-ai-hero-visual::after { background: linear-gradient(0deg, rgba(3,6,14,.46), transparent 48%); }
  .bc-ai-level-grid { grid-template-columns: 1fr; }
  .bc-ai-level-card { min-height: auto; }
  .bc-ai-level-card > p { min-height: 0; }
  .bc-ai-cta { grid-template-columns: 1fr; align-items: start; }
  .bc-ai-contact-actions--footer { justify-content: flex-start; }
}

@media (max-width: 767px) {
  body.bc-course-document .bc-course-page { padding: 96px 16px 64px; }
  .bc-ai-hero { min-height: 0; border-radius: 17px; }
  .bc-ai-hero-copy { min-height: 0; padding: 48px 24px 42px; }
  .bc-ai-kicker, .bc-ai-section-head > p { font-size: 10px; }
  .bc-ai-hero h1 { margin-top: 19px; font-size: clamp(34px, 10vw, 43px); line-height: 1.16; }
  .bc-ai-hero-lead { margin-top: 20px; font-size: 16px; line-height: 1.72; }
  .bc-ai-contact { margin-top: 26px; }
  .bc-ai-contact > p { font-size: 13px; }
  .bc-ai-contact-actions { gap: 7px; }
  .bc-ai-contact-button { min-height: 44px; gap: 6px; padding: 6px 10px 6px 7px; border-radius: 10px; font-size: 12px; }
  .bc-ai-contact-button img, .bc-ai-contact-button .fa-weixin { width: 28px; height: 28px; }
  .bc-ai-contact-button .fa-weixin { font-size: 17px; }
  .bc-ai-hero-visual { min-height: 285px; }
  .bc-ai-hero-visual img { object-position: 48% 50%; }
  .bc-ai-features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bc-ai-features article { min-height: 176px; padding: 28px 17px 25px; border-bottom: 1px solid var(--bc-ai-line); }
  .bc-ai-features article:nth-child(2n) { border-right: 0; }
  .bc-ai-features article:nth-last-child(-n + 2) { border-bottom: 0; }
  .bc-ai-features i { font-size: 22px; }
  .bc-ai-features h2 { margin-top: 21px; font-size: 16px; }
  .bc-ai-features p { font-size: 13px; line-height: 1.58; }
  .bc-ai-section { margin-top: 70px; }
  .bc-ai-section-head { margin-bottom: 24px; }
  .bc-ai-section-head h2 { margin-top: 10px; font-size: 31px; }
  .bc-ai-section-head > span { margin-top: 13px; font-size: 15px; line-height: 1.65; }
  .bc-ai-learning-grid { grid-template-columns: 1fr; gap: 10px; }
  .bc-ai-learning-card, .bc-ai-learning-card--agent { grid-column: auto; min-height: 0; padding: 25px 23px; border-radius: 14px; }
  .bc-ai-learning-card > i { top: 23px; right: 23px; font-size: 25px; }
  .bc-ai-learning-card h3 { margin-top: 22px; font-size: 20px; }
  .bc-ai-learning-card p { font-size: 14px; }
  .bc-ai-audience-grid { grid-template-columns: 1fr; gap: 11px; }
  .bc-ai-audience-card { padding: 28px 24px; border-radius: 15px; }
  .bc-ai-audience-card h3 { margin-top: 18px; font-size: 23px; }
  .bc-ai-audience-card ul { margin-top: 20px; gap: 12px; }
  .bc-ai-audience-card li { font-size: 14px; }
  .bc-ai-level-grid { gap: 10px; }
  .bc-ai-level-card { padding: 26px 23px; border-radius: 14px; }
  .bc-ai-level-card h3 { font-size: 22px; }
  .bc-ai-flow ol { grid-template-columns: 1fr; border-top: 0; }
  .bc-ai-flow li { min-height: 0; padding: 23px 0 23px 52px; border-right: 0; border-bottom: 1px solid var(--bc-ai-line); }
  .bc-ai-flow li:first-child { border-top: 1px solid var(--bc-ai-line); }
  .bc-ai-flow li:not(:last-child)::after { top: auto; right: auto; bottom: -5px; left: 12px; transform: rotate(135deg); }
  .bc-ai-flow span { position: absolute; top: 25px; left: 0; }
  .bc-ai-flow h3 { margin: 0; font-size: 17px; }
  .bc-ai-flow p { margin-top: 7px; font-size: 14px; }
  .bc-ai-cta { gap: 27px; margin-top: 72px; padding: 38px 24px; border-radius: 17px; }
  .bc-ai-cta h2 { font-size: 28px; line-height: 1.28; }
  .bc-ai-cta p { font-size: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  .bc-ai-contact-button, .bc-ai-learning-card { transition: none; }
}