*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --gold: #B89540;
  --gold-light: #D4AC4C;
  --gold-dark: #8A6E28;
  --navy: #0D1B2A;
  --navy-mid: #1A2E42;
  --navy-light: #243A52;
  --off-white: #F7F5F0;
  --text-dark: #1A1A1A;
  --text-mid: #4A4A4A;
  --text-light: #888;
  --border: #E0D8C8;
  --red-accent: #C0392B;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: #fff;
  color: var(--text-dark);
  line-height: 1.7;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ========== HEADER ========== */
.site-header {
  background: var(--navy);
  padding: 12px 0;
  text-align: center;
}
.site-header img { margin: 0 auto; height: 36px; }
.site-header .logo-text {
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.site-header .logo-text span { color: var(--gold); }

/* ========== HERO ========== */
.hero {
  background: var(--navy);
  padding: 48px 20px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(184,149,64,0.12) 0%, transparent 60%);
  pointer-events: none;
}
.hero__eyebrow {
  display: inline-block;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  padding: 4px 18px;
  margin-bottom: 20px;
  text-transform: uppercase;
}
.hero__tag {
  background: var(--red-accent);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 4px 16px;
  display: inline-block;
  margin-bottom: 16px;
}
.hero__title {
  color: #fff;
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}
.hero__title em {
  color: var(--gold);
  font-style: normal;
}
.hero__title span{
  font-size: clamp(16px, 2.6vw, 24px);
  letter-spacing: 2px;
  font-weight: 500;
  display: block;
}
.hero__subtitle {
  color: rgba(255,255,255,0.8);
  font-size: 14px;
  margin-bottom: 32px;
  letter-spacing: 0.06em;
}
.hero__date-badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--gold);
  padding: 10px 28px;
  color: #fff;
}
.hero__date-badge .date-label {
  font-size: 11px;
  color: var(--gold);
  letter-spacing: 0.12em;
}
.hero__date-badge .date-value {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.hero__date-badge .date-note {
  font-size: 11px;
  color: rgba(255,255,255,0.7);
}

/* ========== ABOUT SECTION ========== */
.about {
  background: var(--navy-mid);
  padding: 40px 20px;
}
.about__inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.section-label__line {
  width: 32px;
  height: 1px;
  background: var(--gold);
}
.section-label__text {
  color: var(--gold);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.about__heading {
  color: #fff;
  font-size: clamp(16px, 3vw, 22px);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.6;
}
.about__heading em {
  color: var(--gold);
  font-style: normal;
}
.about__body {
  color: rgba(255,255,255,0.75);
  font-size: 14px;
  line-height: 1.9;
  margin-bottom: 24px;
}
.about__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
  padding: 10px 24px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: background 0.2s;
  cursor: pointer;
}
.about__cta:hover { background: rgba(184,149,64,0.1); }
.about__cta::after { content: '→'; }

/* ========== DIVIDER ========== */
.gold-divider {
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

/* ========== SEMINARS SECTION ========== */
.seminars {
  background: var(--off-white);
  padding: 56px 20px;
}
.seminars__inner { max-width: 860px; margin: 0 auto; }
.seminars__heading {
  font-size: clamp(18px, 3vw, 26px);
  font-weight: 900;
  color: var(--navy);
  text-align: center;
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}
.seminars__heading span { color: var(--gold-dark); }
.seminars__sub {
  text-align: center;
  color: var(--text-mid);
  font-size: 13px;
  margin-bottom: 40px;
}

/* ========== SEMINAR CARD ========== */
.seminar-card {
  background: #fff;
  border: 1px solid var(--border);
  margin-bottom: 32px;
  overflow: hidden;
}
.seminar-card__header {
  background: var(--navy);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}
.seminar-card__header .speaker-role {
  color: var(--gold);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  border: 1px solid var(--gold);
  padding: 2px 10px;
  flex-shrink: 0;
  margin-right: 7px;
}
.seminar-card__header .speaker-name {
  color: #fff;
  font-size: 18px;
  font-weight: 700;
}
.seminar-card__body {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 0;
}
@media (max-width: 640px) {
  .seminar-card__body { grid-template-columns: 1fr; 
  display: flex;
  flex-wrap: wrap;
  }
}
.seminar-card__banner {
  display: flex;
  justify-content: center;
  flex-direction: column;
  flex-shrink: 0;
  aspect-ratio: 2 / 1;
}
.seminar-card__banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  
}
.seminar-card__content {
  padding: 20px 12px 0 12px;
}
@media (max-width: 600px) {
  .seminar-card__content { border-left: none; border-top: 1px solid var(--border); }
.seminar-card__banner {width: 100%;}
}
.seminar-card__eyebrow {
  color: var(--text-light);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.seminar-card__title {
  font-size: clamp(16px, 2.5vw, 20px);
  font-weight: 900;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 12px;
}
.seminar-card__title em {
  color: var(--red-accent);
  font-style: normal;
}
.seminar-card__time {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--navy);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  margin-bottom: 16px;
}
.seminar-card__time::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
}
.seminar-card__topics {
  list-style: none;
  margin-bottom: 20px;
}
.seminar-card__topics li {
  font-size: 13px;
  color: var(--text-mid);
  padding: 4px 0 4px 16px;
  border-bottom: 1px dotted var(--border);
  position: relative;
  line-height: 1.6;
}
.seminar-card__topics li::before {
  content: '・';
  position: absolute;
  left: 0;
  color: var(--gold-dark);
}
.seminar-card__notice {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 12px;
  padding: 8px 12px;
  background: var(--off-white);
  border-left: 2px solid var(--gold);
}
.seminar-card__notice strong { color: var(--text-mid); }
.seminar-card__buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.sec_button{
  margin:1em auto;
  width:90%;
  display: flex;
  flex-wrap: wrap;
  justify-content:space-around;
}
.exslusive-text{
  font-size: 13px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--navy);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 10px 18px;
  letter-spacing: 0.06em;
  transition: background 0.2s;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.btn-primary:hover { background: var(--navy-light); }
.btn-exclusive {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color:#C0392B ;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 10px 18px;
  letter-spacing: 0.06em;
  transition: background 0.2s;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.btn-exclusive:hover { background-color:ee392B;}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--navy);
  color: var(--navy);
  font-size: 12px;
  font-weight: 700;
  padding: 10px 18px;
  letter-spacing: 0.06em;
  transition: background 0.2s;
  cursor: pointer;
  text-decoration: none;
  justify-content: center;
  margin-top: 1em;
}
.btn-secondary:hover { background: var(--off-white); }
.btn-arrow::after { content: ' →'; }



/* ========== FOOTER ========== */
.site-footer {
  background: var(--navy);
  padding: 40px 20px;
  text-align: center;
}
.site-footer .footer-logo {
  text-align: center;
}
.site-footer .footer-logo img{
  max-width: 300px;
  height: auto;
  display: inline-block;
}
.site-footer p {
  color: rgba(255,255,255,0.5);
  font-size: 12px;
}
.site-footer .footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 16px 0;
  flex-wrap: wrap;
}
.site-footer .footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 12px;
  transition: color 0.2s;
}
.site-footer .footer-links a:hover { color: var(--gold); }

/* ========== RESPONSIVE ========== */
@media (max-width: 640px) {
  .seminars { padding: 40px 16px; }
  .seminar-card__content { padding: 16px; }
  .seminar-card__buttons { flex-direction: column; }
  .btn-primary, .btn-secondary { justify-content: center; }
}