/* Root library directory: a neutral doorway into the two course identities. */

.library-home {
  min-height: 100vh;
  overflow-y: auto;
}

.library-home::before {
  background:
    radial-gradient(circle at 8% 9%, rgba(86, 216, 255, 0.13), transparent 25%),
    radial-gradient(circle at 92% 14%, rgba(126, 240, 181, 0.09), transparent 24%),
    linear-gradient(145deg, #06101d, #0a1a29 46%, #07131f 100%);
}

.library-home a {
  color: inherit;
}

.library-home .site {
  width: min(1180px, calc(100% - 44px));
  margin: 0 auto;
  padding: 18px 0 42px;
}

.library-home .landing-nav {
  margin-bottom: 14px;
  border-color: rgba(255, 255, 255, 0.11);
  border-radius: 12px;
  background: rgba(5, 15, 27, 0.72);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.16);
}

.library-home .landing-brand-mark {
  border-radius: 9px;
  background: linear-gradient(145deg, rgba(86, 216, 255, 0.18), rgba(126, 240, 181, 0.09));
}

.library-home .hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(270px, 0.65fr);
  grid-template-rows: auto;
  gap: clamp(34px, 5vw, 72px);
  align-items: stretch;
  min-height: 330px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 22px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    radial-gradient(circle at 76% 15%, rgba(86, 216, 255, 0.13), transparent 29%),
    linear-gradient(135deg, rgba(12, 31, 47, 0.97), rgba(7, 20, 32, 0.96));
  background-size: 38px 38px, 38px 38px, auto, auto;
  padding: clamp(32px, 5vw, 62px);
  box-shadow: 0 28px 76px rgba(0, 0, 0, 0.27);
}

.library-home .hero::before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  right: -170px;
  bottom: -210px;
  border: 1px solid rgba(126, 240, 181, 0.2);
  border-radius: 50%;
  box-shadow:
    0 0 0 46px rgba(126, 240, 181, 0.025),
    0 0 0 92px rgba(86, 216, 255, 0.018);
  pointer-events: none;
}

.library-home .hero::after {
  content: "OH";
  position: absolute;
  right: clamp(18px, 3vw, 42px);
  top: -0.24em;
  color: rgba(255, 255, 255, 0.018);
  font-size: clamp(150px, 20vw, 268px);
  font-weight: 900;
  letter-spacing: -0.1em;
  line-height: 1;
  pointer-events: none;
}

.library-home .hero-copy,
.library-home .hero-guide {
  position: relative;
  z-index: 1;
}

.library-home .hero-copy {
  align-self: center;
}

.library-home .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--green);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.library-home .eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
}

.library-home .hero h1 {
  max-width: 14ch;
  margin: 18px 0 0;
  color: #f7fbff;
  font-size: clamp(50px, 6.7vw, 84px);
  font-weight: 790;
  letter-spacing: -0.055em;
  line-height: 0.92;
  text-wrap: balance;
}

.library-home .hero h1 span {
  display: block;
  width: fit-content;
  margin-top: 0.08em;
  background: linear-gradient(100deg, var(--cyan), #a5eadf 58%, var(--green));
  background-clip: text;
  color: transparent;
  -webkit-background-clip: text;
}

.library-home .lead {
  max-width: 37rem;
  margin: 24px 0 0;
  color: rgba(225, 236, 248, 0.78);
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.45;
}

.library-home .hero-guide {
  display: grid;
  align-content: start;
  align-self: stretch;
  gap: 10px;
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-top-color: rgba(86, 216, 255, 0.42);
  border-radius: 16px;
  background: rgba(4, 14, 25, 0.6);
  padding: clamp(22px, 3vw, 30px);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(16px);
}

.library-home .hero-guide-label {
  color: var(--cyan);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.library-home .hero-guide-link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.035);
  padding: 14px;
  text-decoration: none;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.library-home .hero-guide-label + .hero-guide-link {
  margin-top: 8px;
}

.library-home .hero-guide-link:hover,
.library-home .hero-guide-link:focus-visible {
  transform: translateX(3px);
  border-color: rgba(86, 216, 255, 0.36);
  background: rgba(86, 216, 255, 0.08);
  outline: none;
}

.library-home .hero-guide-link.investment-guide:hover,
.library-home .hero-guide-link.investment-guide:focus-visible {
  border-color: rgba(126, 240, 181, 0.36);
  background: rgba(126, 240, 181, 0.07);
}

.library-home .hero-guide-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(86, 216, 255, 0.34);
  border-radius: 9px;
  background: rgba(86, 216, 255, 0.1);
  color: var(--cyan);
  font-size: 12px;
  font-weight: 900;
}

.library-home .investment-guide .hero-guide-mark {
  border-color: rgba(126, 240, 181, 0.34);
  background: rgba(126, 240, 181, 0.09);
  color: var(--green);
}

.library-home .hero-guide-link strong,
.library-home .hero-guide-link small {
  display: block;
}

.library-home .hero-guide-link strong {
  color: #f7fbff;
  font-size: 14px;
  line-height: 1.2;
}

.library-home .hero-guide-link small {
  margin-top: 4px;
  color: rgba(195, 211, 230, 0.68);
  font-size: 11px;
  line-height: 1.35;
}

.library-home .hero-guide-arrow {
  color: rgba(235, 244, 255, 0.7);
  transition: transform 180ms var(--ease);
}

.library-home .hero-guide-link:hover .hero-guide-arrow,
.library-home .hero-guide-link:focus-visible .hero-guide-arrow {
  transform: translateX(2px);
}

.library-home .section {
  margin-top: 36px;
}

.library-home .section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 390px);
  gap: 34px;
  align-items: end;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.11);
  padding-bottom: 19px;
}

.library-home .section-kicker {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 9px;
  color: var(--cyan);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.library-home .section-kicker::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

.library-home .section h2 {
  color: #f7fbff;
  font-size: clamp(36px, 4.3vw, 52px);
  font-weight: 720;
  letter-spacing: -0.045em;
  line-height: 1;
}

.library-home .section-intro {
  margin: 0;
  color: rgba(195, 211, 230, 0.72);
  font-size: 15px;
  line-height: 1.55;
}

.library-home .course-entry-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.library-home .course-entry-card {
  position: relative;
  overflow: hidden;
  display: grid;
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 20px;
  background: rgba(9, 23, 36, 0.8);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.2);
  transition: transform 220ms var(--ease), border-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.library-home .course-entry-card:hover,
.library-home .course-entry-card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(86, 216, 255, 0.28);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.27);
}

.library-home .investment-entry:hover,
.library-home .investment-entry:focus-within {
  border-color: rgba(126, 240, 181, 0.28);
}

.library-home .course-entry-media {
  position: relative;
  height: 176px;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: #0a1825;
}

.library-home .course-entry-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 15, 26, 0.08), rgba(5, 15, 26, 0.72)),
    linear-gradient(90deg, rgba(5, 15, 26, 0.42), transparent 58%);
  pointer-events: none;
}

.library-home .course-entry-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.82;
  filter: saturate(0.86) contrast(1.05);
  transition: transform 420ms var(--ease), opacity 220ms var(--ease), filter 220ms var(--ease);
}

.library-home .economics-entry .course-entry-media img {
  object-position: center 57%;
}

.library-home .investment-entry .course-entry-media img {
  object-position: center 54%;
}

.library-home .course-entry-card:hover .course-entry-media img,
.library-home .course-entry-card:focus-within .course-entry-media img {
  transform: scale(1.035);
  opacity: 0.94;
  filter: saturate(1) contrast(1.04);
}

.library-home .course-type {
  position: absolute;
  z-index: 1;
}

.library-home .course-type {
  top: 16px;
  right: 16px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(4, 14, 24, 0.68);
  color: rgba(247, 251, 255, 0.9);
  padding: 7px 10px;
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  backdrop-filter: blur(12px);
}

.library-home .course-entry-content {
  display: grid;
  gap: 16px;
  min-width: 0;
  padding: clamp(23px, 3vw, 30px);
}

.library-home .course-heading {
  display: grid;
  gap: 8px;
}

.library-home .course-entry-card h3 {
  max-width: 20ch;
  margin: 0;
  color: #f7fbff;
  font-size: clamp(27px, 2.75vw, 36px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.08;
  text-wrap: balance;
}

.library-home .course-entry-card p {
  margin: 0;
  color: rgba(195, 211, 230, 0.75);
  font-size: 15px;
  line-height: 1.55;
}

.library-home .course-entry-card .course-title-zh {
  color: rgba(229, 239, 249, 0.84);
  font-size: 16px;
  font-weight: 720;
  letter-spacing: 0;
  line-height: 1.3;
}

.library-home .course-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.library-home .course-tags li {
  border: 1px solid rgba(86, 216, 255, 0.18);
  border-radius: 999px;
  background: rgba(86, 216, 255, 0.055);
  color: rgba(219, 231, 246, 0.75);
  padding: 6px 9px;
  font-size: 11px;
  font-weight: 750;
  line-height: 1;
}

.library-home .investment-entry .course-tags li {
  border-color: rgba(126, 240, 181, 0.18);
  background: rgba(126, 240, 181, 0.05);
}

.library-home .course-actions {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(145px, 0.65fr);
  gap: 9px;
  margin-top: 4px;
}

.library-home .course-link {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.035);
  color: rgba(247, 251, 255, 0.92);
  padding: 10px 13px;
  font-size: 13px;
  font-weight: 820;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.library-home .course-link:hover,
.library-home .course-link:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(86, 216, 255, 0.45);
  background: rgba(86, 216, 255, 0.09);
  outline: none;
}

.library-home .course-link:focus-visible {
  box-shadow: 0 0 0 3px rgba(86, 216, 255, 0.16);
}

.library-home .course-link.primary {
  gap: 10px;
  border-color: rgba(86, 216, 255, 0.62);
  background: var(--cyan);
  color: #06131b;
}

.library-home .course-arrow {
  font-size: 16px;
  line-height: 1;
  transition: transform 180ms var(--ease);
}

.library-home .course-link.primary:hover .course-arrow,
.library-home .course-link.primary:focus-visible .course-arrow {
  transform: translateX(3px);
}

.library-home .course-link.primary:hover,
.library-home .course-link.primary:focus-visible {
  border-color: #a6edff;
  background: #8ce7ff;
}

.library-home .investment-entry .course-link.primary {
  border-color: rgba(126, 240, 181, 0.68);
  background: var(--green);
}

.library-home .investment-entry .course-link.primary:hover,
.library-home .investment-entry .course-link.primary:focus-visible {
  border-color: #b0f8d3;
  background: #9cf5c7;
}

.library-home .footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 34px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 19px;
  color: rgba(157, 176, 204, 0.72);
  font-size: 12px;
  line-height: 1.45;
}

@media (max-width: 900px) {
  .library-home .hero {
    grid-template-columns: minmax(0, 1fr) minmax(230px, 0.58fr);
    gap: 28px;
  }

  .library-home .course-actions {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .library-home .site {
    width: min(100% - 26px, 1180px);
    padding-top: 12px;
  }

  .library-home .landing-nav {
    align-items: flex-start;
    flex-wrap: wrap;
    margin-bottom: 10px;
  }

  .library-home .landing-brand {
    width: 100%;
  }

  .library-home .landing-nav-links {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .library-home .hero {
    grid-template-columns: 1fr;
    gap: 26px;
    min-height: 0;
    border-radius: 18px;
    padding: 28px;
  }

  .library-home .hero h1 { max-width: none; }

  .library-home .section-head,
  .library-home .course-entry-grid,
  .library-home .footer {
    grid-template-columns: 1fr;
  }

  .library-home .section-head {
    gap: 12px;
  }

  .library-home .footer {
    display: grid;
    gap: 8px;
  }
}

@media (max-width: 460px) {
  .library-home .site {
    width: min(100% - 20px, 1180px);
  }

  .library-home .landing-nav-link {
    padding-inline: 8px;
    font-size: 11px;
  }

  .library-home .hero {
    padding: 24px 21px;
  }

  .library-home .hero h1 {
    font-size: clamp(43px, 14vw, 56px);
  }

  .library-home .lead {
    margin-top: 18px;
    font-size: 17px;
  }

  .library-home .hero-guide {
    padding: 20px;
  }

  .library-home .hero-guide-link {
    padding: 12px;
  }

  .library-home .section {
    margin-top: 28px;
  }

  .library-home .section h2 {
    font-size: 34px;
  }

  .library-home .course-entry-card {
    border-radius: 16px;
  }

  .library-home .course-entry-media {
    height: 148px;
  }

  .library-home .course-type {
    top: 13px;
    right: 13px;
  }

  .library-home .course-entry-content {
    padding: 21px;
  }

  .library-home .course-entry-card h3 {
    font-size: 27px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .library-home *,
  .library-home *::before,
  .library-home *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}