/* course_directory_agentic.css
 * Stripe + blue theme for /course_directory_agentic. Shares the .csa-*
 * namespace with the rest of the agentic surface. Self-contained.
 */

:root {
  --csa-bg: #e7edf5;
  --csa-surface: #ffffff;
  --csa-surface-tint: #eff3f8;
  --csa-border: #cfd9e6;
  --csa-border-strong: #aebcce;
  --csa-text: #06203d;
  --csa-text-muted: #344662;
  --csa-text-subtle: #5b6b85;
  --csa-primary: #0a84ff;
  --csa-primary-strong: #0066d4;
  --csa-primary-dark: #1e40af;
  --csa-primary-soft: rgba(10, 132, 255, 0.10);
  --csa-cyan: #0891b2;
  --csa-accent-grad: linear-gradient(180deg, #2563eb 0%, #22d3ee 100%);
  --csa-radius: 12px;
  --csa-radius-sm: 8px;
  --csa-shadow-sm: 0 1px 2px rgba(6, 32, 61, 0.06), 0 1px 3px rgba(6, 32, 61, 0.08);
  --csa-shadow-md: 0 4px 14px rgba(6, 32, 61, 0.10), 0 2px 4px rgba(6, 32, 61, 0.06);
  --csa-shadow-lg: 0 18px 40px rgba(6, 32, 61, 0.14), 0 6px 12px rgba(6, 32, 61, 0.08);
  --csa-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  --csa-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html, body { background-color: var(--csa-bg); }
.csa-page *, .csa-page *::before, .csa-page *::after { box-sizing: border-box; }

.csa-page {
  background: var(--csa-bg);
  min-height: calc(100vh - 41px);
  padding: 36px 24px 56px;
  font-family: var(--csa-font);
  color: var(--csa-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.csa-shell { max-width: 1200px; margin: 0 auto; }
.csa-shell--mid { max-width: 860px; }

/* ---------- Hero (shared) ---------- */
.csa-hero {
  text-align: center;
  padding: 24px 0 36px;
  margin-bottom: 8px;
}
.csa-eyebrow {
  display: inline-block;
  padding: 5px 12px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--csa-primary);
  background: var(--csa-primary-soft);
  border: 1px solid rgba(10, 132, 255, 0.22);
  border-radius: 999px;
  margin-bottom: 18px;
}
.csa-hero__title {
  margin: 0 0 14px;
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--csa-text);
}
.csa-brand-d { color: var(--csa-text); }
.csa-brand-t {
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 40%, #0891b2 100%);
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--csa-primary);
}
.csa-hero__subtitle {
  margin: 0 auto;
  max-width: 760px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--csa-text-muted);
}

/* ---------- Course panel ---------- */
.csa-course {
  position: relative;
  margin: 16px 0 30px;
  padding: 44px 48px 40px;
  background:
    radial-gradient(800px 380px at 50% -25%, rgba(10, 132, 255, 0.14), transparent 65%),
    var(--csa-surface);
  border: 1px solid var(--csa-border);
  border-radius: var(--csa-radius);
  box-shadow: var(--csa-shadow-md);
  overflow: hidden;
}
.csa-course::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--csa-accent-grad);
}

.csa-course__ribbon {
  display: inline-block;
  padding: 5px 12px;
  background: var(--csa-primary-soft);
  border: 1px solid rgba(10, 132, 255, 0.22);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--csa-primary-strong);
  margin-bottom: 14px;
}

.csa-course__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--csa-text);
  line-height: 1.25;
}

.csa-course__intro {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--csa-text-muted);
}

.csa-course__bullets {
  list-style: none;
  margin: 0 0 24px;
  padding: 22px 24px;
  background: var(--csa-surface-tint);
  border: 1px solid var(--csa-border);
  border-radius: var(--csa-radius-sm);
}
.csa-course__bullets li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 7px 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--csa-text);
}
.csa-course__bullets li + li { border-top: 1px dashed var(--csa-border); }
.csa-course__bullets strong {
  color: var(--csa-primary-strong);
  font-weight: 700;
}

.csa-course__bullet-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(180deg, var(--csa-primary) 0%, var(--csa-primary-strong) 100%);
  border-radius: 50%;
  margin-top: 2px;
  box-shadow: 0 2px 4px rgba(10, 132, 255, 0.30);
}

.csa-course__meta {
  font-size: 12.5px;
  color: var(--csa-text-subtle);
  text-align: center;
  margin-bottom: 14px;
}

.csa-course__cta {
  display: flex;
  justify-content: center;
  margin-top: 4px;
}

/* ---------- CTA buttons (shared) ---------- */
.csa-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 26px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 10px;
  text-decoration: none;
  transition: transform 140ms var(--csa-ease), box-shadow 160ms var(--csa-ease), background 160ms var(--csa-ease), color 160ms var(--csa-ease), border-color 160ms var(--csa-ease);
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.csa-cta--lg { padding: 14px 32px; font-size: 16px; }
.csa-cta .csa-cta__arrow {
  display: inline-block;
  font-size: 18px;
  line-height: 0.8;
  transform: translateY(-1px);
  transition: transform 180ms var(--csa-ease);
}
.csa-cta:hover .csa-cta__arrow { transform: translate(3px, -1px); }
.csa-cta--primary {
  color: #fff;
  background: linear-gradient(180deg, #3b82f6 0%, var(--csa-primary-dark) 100%);
  border: 1px solid transparent;
  box-shadow:
    0 8px 22px rgba(37, 99, 235, 0.38),
    0 2px 6px rgba(37, 99, 235, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
.csa-cta--primary:hover {
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
  background: linear-gradient(180deg, #60a5fa 0%, var(--csa-primary-strong) 100%);
  box-shadow:
    0 12px 30px rgba(37, 99, 235, 0.45),
    0 3px 8px rgba(37, 99, 235, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

/* ---------- Footnote ---------- */
.csa-footnote {
  text-align: center;
  margin: 24px auto 0;
  padding: 16px 12px;
  font-size: 13px;
  color: var(--csa-text-subtle);
  line-height: 1.7;
}
.csa-footnote a {
  color: var(--csa-primary);
  font-weight: 600;
  text-decoration: none;
}
.csa-footnote a:hover { color: var(--csa-primary-strong); text-decoration: underline; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .csa-page { padding: 24px 14px 40px; }
  .csa-course { padding: 28px 22px 26px; }
  .csa-course__bullets { padding: 18px 16px; }
}