/* BRL Seminar archive - English version
   Use with brl-seminar_en.html or paste the section into the English overview page.
   The layout mirrors the Japanese BRL Seminar page: page header + year-by-year accordion. */
:root {
  --ntt-blue: #0068b7;
  --ntt-blue-dark: #004f9f;
  --ink: #111827;
  --muted: #5f6b7a;
  --subtle: #8a96a6;
  --line: #d9e2ec;
  --bg: #f5f8fb;
  --card: #ffffff;
  --shadow: 0 10px 24px rgb(20 45 80 / 0.08);
  --radius-lg: 18px;
  --radius-md: 12px;
  --content-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgb(0 104 183 / 0.08), transparent 32rem),
    linear-gradient(180deg, #fff 0%, var(--bg) 100%);
  font-family: "Helvetica Neue", Arial, "Noto Sans", "Segoe UI", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.brl-page-wrap {
  width: min(var(--content-width), calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 84px;
}

.brl-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 13px;
}

.brl-breadcrumb a {
  color: var(--ntt-blue);
  text-decoration: none;
}

.brl-breadcrumb a:hover { text-decoration: underline; }

.brl-seminar-archive { scroll-margin-top: 110px; }

.brl-seminar-header {
  margin-bottom: 28px;
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #fff 0%, #f7fbff 100%);
  box-shadow: 0 8px 20px rgb(20 45 80 / 0.055);
}

.brl-seminar-eyebrow {
  margin: 0 0 8px;
  color: var(--ntt-blue);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.brl-seminar-header h1 {
  margin: 0 0 18px;
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.brl-seminar-lead {
  max-width: 780px;
  margin: 0 0 14px;
  color: #344054;
  font-size: clamp(16px, 2vw, 18px);
  font-weight: 400;
}

.brl-seminar-summary {
  display: inline-flex;
  margin: 0;
  padding: 6px 13px;
  border: 1px solid rgb(0 104 183 / 0.16);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-size: 13px;
  font-weight: 500;
}

.seminar-accordion {
  display: grid;
  gap: 12px;
}

.seminar-year {
  overflow: clip;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgb(255 255 255 / 0.94);
  box-shadow: 0 6px 16px rgb(20 45 80 / 0.045);
}

.seminar-year summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  transition: background 160ms ease;
}

.seminar-year summary::-webkit-details-marker { display: none; }

.seminar-year summary:hover { background: #f3f8fd; }

.seminar-year summary::after {
  display: inline-grid;
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 999px;
  color: var(--ntt-blue);
  background: #eef6fc;
  font-size: 18px;
  font-weight: 500;
  line-height: 1;
  content: "+";
}

.seminar-year[open] summary {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, #f7fbff 0%, #fff 100%);
}

.seminar-year[open] summary::after { content: "−"; }

.seminar-year-label {
  flex: 1 1 auto;
  color: var(--ntt-blue);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.seminar-year-count {
  flex: 0 0 auto;
  padding: 3px 10px;
  border: 1px solid rgb(0 104 183 / 0.18);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
}

.seminar-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.seminar-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 250px);
  gap: 18px;
  padding: 20px;
  border-bottom: 1px solid rgb(217 226 236 / 0.85);
}

.seminar-item:last-child { border-bottom: 0; }

.seminar-item:hover { background: #fbfdff; }

.seminar-title {
  margin: 0 0 7px;
  color: var(--ink);
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.5;
  letter-spacing: -0.01em;
}

.seminar-speaker,
.seminar-affiliation,
.seminar-meta { margin: 0; }

.seminar-speaker {
  color: #243447;
  font-size: 15px;
  font-weight: 500;
}

.seminar-speaker::before {
  margin-right: 0.5em;
  color: var(--subtle);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  content: "Speaker";
}

.seminar-affiliation {
  margin-top: 2px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.seminar-affiliation::before {
  margin-right: 0.5em;
  color: var(--subtle);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  content: "Affiliation";
}

.seminar-meta {
  justify-self: end;
  color: #344054;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  text-align: right;
  white-space: nowrap;
}

.seminar-submeta {
  display: block;
  margin-top: 5px;
  color: var(--subtle);
  font-size: 12px;
  font-weight: 400;
}

@media (max-width: 760px) {
  .brl-page-wrap { width: min(100% - 28px, var(--content-width)); }

  .seminar-year summary { padding: 15px 16px; }

  .seminar-item {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 17px 16px;
  }

  .seminar-meta {
    justify-self: start;
    text-align: left;
    white-space: normal;
  }
}

@media (max-width: 520px) {
  .seminar-year summary { align-items: flex-start; }

  .seminar-year-count { white-space: normal; }
}