@charset "UTF-8";

body {
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  letter-spacing: 0.05em;
  font-feature-settings: "palt";
}

a {
  text-decoration: none;
}

a:hover {
  cursor: pointer;
}

a.btn {
  display: inline-flex;
}

ul li {
  list-style: none;
}

/* Layout utilities */
.min-h-screen {
  min-height: 100vh;
}

.relative {
  position: relative;
}

.absolute {
  position: absolute;
  top: -2rem;
  left: -2.5rem;
}

.inline-flex {
  display: inline-flex;
}

.flex {
  display: flex;
}

.grid {
  display: grid;
}

.inline-block {
  display: inline-block;
}

.block {
  display: block;
}

.only-sp,
.on-sp,
.only-sp-s {
  display: none;
}

/* Grid utilities */
.grid-cols-1 {
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

/* Flexbox utilities */
.flex-col {
  flex-direction: column;
}

.flex-shrink {
  flex-shrink: 0;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

.self-start {
  align-self: flex-start;
}

.self-end {
  align-self: flex-end;
}

.justify-center {
  justify-content: center;
}

.justify-space-between {
  justify-content: space-between;
}

.flex-wrap {
  flex-wrap: wrap;
}

/* Spacing utilities */
.gap-2 {
  gap: 0.5rem;
}

.gap-3 {
  gap: 0.75rem;
}

.gap-4 {
  gap: 1rem;
}

.gap-6 {
  gap: 1.5rem;
}

.gap-12 {
  gap: 3rem;
}

.space-y-2>*+* {
  margin-top: 0.5rem;
}

.space-y-3>*+* {
  margin-top: 0.75rem;
}

.space-y-6>*+* {
  margin-top: 1.5rem;
}

.space-y-8>*+* {
  margin-top: 2rem;
}

.space-y {
  margin-top: -1rem;
}

.space-y-10 {
  margin-top: -5rem;
}

/* Font utilities */
.text-xs {
  font-size: 0.75rem;
}

.text-sm {
  font-size: 0.875rem;
}

.text-base {
  font-size: 1rem;
}

.text-lg {
  font-size: 1.125rem;
}

.text-lg-1 {
  font-size: 1.125rem;
  line-height: 1;
}

.text-lg-3 {
  font-size: 1.3rem;
}

.text-xl {
  font-size: 1.75rem;
}

.text-2xl {
  font-size: 1.5rem;
}

.text-3xl {
  font-size: 2rem;
}

.text-4xl {
  font-size: 2.25rem;
}

.text-5xl {
  font-size: 4rem;
}

.text-big {
  font-size: 4rem;
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

.leading-tight {
  line-height: 1.25;
}

.leading-relaxed {
  line-height: 1.625;
}

/* Margin utilities */
.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-3 {
  margin-bottom: 0.75rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.mb-6 {
  margin-bottom: 1.5rem;
}

.mb-8 {
  margin-bottom: 2rem;
}

.mb-12 {
  margin-bottom: 3rem;
}

.mb-16 {
  margin-bottom: 4rem;
}

.mt-1 {
  margin-top: 0.25rem;
}

.mr-1 {
  margin-right: 0.5rem;
}

.mr-2 {
  margin-right: -5rem;
}

.mr-3 {
  margin-right: 1rem;
}

/* Padding utilities */
.p-1 {
  line-height: 1;
  padding: 0.5em;
}

.p-3 {
  padding: 0.75rem;
}

.p-4 {
  padding: 1rem;
}

.p-8 {
  padding: 2rem;
}

.p-10 {
  padding: 2.5rem;
}

.p-12 {
  padding: 3rem;
}

.pt-1 {
  padding-top: 3rem;
}

.pt-2 {
  padding-top: 2rem;
}

.px-3 {
  padding-left: 0.75rem;
  padding-right: 0.75rem;
}

.px-4 {
  padding-left: 1rem;
  padding-right: 1rem;
}

.px-6 {
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.px-8 {
  padding-left: 2rem;
  padding-right: 2rem;
}

.px-20 {
  padding-left: 5rem;
  padding-right: 5rem;
}

.py-2 {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.py-3 {
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.py-4 {
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.py-12 {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.py-20 {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.pxy {
  padding: 0 10px 5px;
}

/* Width and height utilities */
.w-4 {
  width: 1rem;
}

.w-5 {
  width: 1.25rem;
}

.w-6 {
  width: 1.5rem;
}

.w-10 {
  width: 2.5rem;
}

.w-40 {
  width: 10rem;
}

.w-80 {
  width: 16rem;
}

.w-full {
  width: 100%;
}

.w-80p {
  width: 80%;
}

.h-4 {
  height: 1rem;
}

.h-5 {
  height: 1.25rem;
}

.h-6 {
  height: 1.5rem;
}

.h-12 {
  height: 3rem;
}

.h-16 {
  height: 4rem;
}

.h-40 {
  height: 10rem;
}

.h-full {
  height: 100%;
}

/* Max width utilities */
.max-w-3xl {
  max-width: 48rem;
}

.max-w-4xl {
  max-width: 56rem;
}

.max-w-6xl {
  max-width: 72rem;
}

.max-w-7xl {
  max-width: 80rem;
}

/* Background colors */
.bg-white {
  background-color: #ffffff;
}

.bg-white-80 {
  background-color: #ffffffd0;
}

.bg-gray-50 {
  background-color: #f9fafb;
}

.bg-gray-100 {
  background-color: #f4f4f4;
}

.bg-gray-800 {
  background-color: #1f2937;
}

.bg-gray-900 {
  background-color: #1F2937;
}

.bg-red-600 {
  background-color: #dc2626;
}

.bg-orange {
  background-color: #D97B36;
}

.bg-l-blue {
  background-color: #91D0D7;
}

.bg-blue-100 {
  background-color: #dbeafe;
}

.bg-blue-700 {
  background: linear-gradient(135deg, #3676ff, #33d3ff);
}

.bg-blue-800 {
  background-color: #082745ab;
}

.bg-light-blue {
  background-color: #33d3ff;
}

.bg-soft-blue {
  background-color: #D9EEFA;
}

.bg-purple {
  background: linear-gradient(45deg, #7936ff, #33d3ff);
}

.bg-emerald-100 {
  background-color: #d1fae5;
}

.bg-emerald-600 {
  background: linear-gradient(45deg, #0e9ea0, #13dce0);

}

.bg-yellow-300 {
  background-color: #F9C770;
}

.marker {
  background: linear-gradient(transparent 70%, #c368aa61 70%);
  display: inline;
}

/* Background gradients */
.bg-gradient-to-br {
  background-image: linear-gradient(to bottom right, var(--tw-gradient-stops));
}

.from-emerald-50 {
  --tw-gradient-from: #ecfdf5;
  --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(236, 253, 245, 0));
}

.from-blue-50 {
  --tw-gradient-from: #eff6ff;
  --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(239, 246, 255, 0));
}

.from-gray-50 {
  --tw-gradient-from: #f9fafb;
  --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(249, 250, 251, 0));
}

.to-white {
  --tw-gradient-to: #ffffff;
}

/* Text colors */
.text-white {
  color: #ffffff;
}

.text-gray-300 {
  color: #d1d5db;
}

.text-gray-500 {
  color: #7b7b7b;
}

.text-gray-600 {
  color: #4b5563;
}

.text-gray-700 {
  color: #374151;
}

.text-gray-900 {
  color: #111827;
}

.text-emerald-600 {
  color: #059669;
}

.text-emerald-700 {
  color: #047857;
}

.text-l-blue {
  color: #91D0D7;
}

.text-blue-600 {
  color: #2563eb;
}

.text-blue-700 {
  color: #1d4ed8;
}

.text-blue-800 {
  color: #3246A1;
}

.text-orange {
  color: #D97B36;
}

.text-light-blue {
  color: #00b8ea;
}

.text-purple-soft {
  color: #C7C2F5;
}

.text-purple {
  color: #7C6CFF;
}

.text-shadow {
  text-shadow: #000 2px 2px 0;
}

.text-shadow-bl {
  text-shadow: #41d7ff 1px 1px 1px;
}

.italic {
  font-style: italic;
}

/* Text alignment */
.text-center {
  text-align: center;
}

.nowrap {
  white-space: nowrap;
}

/* Border utilities */
.border {
  border: 1px solid;
}

.border-top {
  border-top: 1px solid;
}

.border-0 {
  border-width: 0px;
}

.border-4 {
  border-width: 4px;
}

.border-gray-200 {
  border-color: #e5e7eb;
}

.border-emerald-200 {
  border-color: #009DA0;
}

.border-blue-200 {
  border-color: #bfdbfe;
}

.border-white {
  border-color: #ffffff;
}

.border-orange {
  border-color: #D97B36;
}

.border-light-blue {
  border-color: #33d3ff;
}

.border-purple {
  border-color: #7C6CFF;
}

/* Border radius */
.rounded-xl {
  border-radius: 0.75rem;
}

.rounded-2xl {
  border-radius: 1rem;
}

.rounded-3xl {
  border-radius: 1.5rem;
}

.rounded-full {
  border-radius: 9999px;
}

/* Shadow utilities */
.shadow-sm {
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.shadow-lg {
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.shadow-xl {
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.shadow-2xl {
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}


/* Object utilities */
.object-cover {
  object-fit: cover;
}

.overflow-hidden {
  overflow: hidden;
}

.resize-none {
  resize: none;
}

/* Focus utilities */
.focus\:border-emerald-500:focus {
  border-color: #10b981;
}

.focus\:ring-2:focus {
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.5);
}

.focus\:ring-emerald-500:focus {
  --tw-ring-color: rgba(16, 185, 129, 0.5);
}

.focus\:outline-none:focus {
  outline: none;
}

/* Hover utilities */
.hover\:bg-orange:hover {
  background-color: #fb8d3f;
}

.hover\:bg-blue-200:hover {
  background-color: #bfdbfe;
}

.hover\:bg-blue-800:hover {
  background-color: #1e40af;
}

.hover\:bg-emerald-200:hover {
  background-color: #a7f3d0;
}

.hover\:bg-emerald-300:hover {
  background-color: #08c58a;
}

.hover\:text-blue-700:hover {
  color: #1d4ed8;
}

.hover\:bg-light-blue:hover {
  background-color: #6CB6E8;
}

.hover\:text-emerald-700:hover {
  color: #047857;
}

.hover\:shadow-md:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.hover\:shadow-xl:hover {
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.hover\:shadow-2xl:hover {
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.hover\:text-green:hover {
  color: #009DA0;
  border-bottom: #009DA0 1px solid;
}

/* Transition utilities */
.transition-all {
  transition: all 0.3s ease;
}

/*    fv
---------------------------------------- */
.person {
  flex: 1;
}

.schedule {
  flex: 2;
}

.date-2 {
  color: #00a6ff;
  padding-bottom: 8px;
}

.date-3 {
  padding: 0 0.4em 3px;
}

.person-text {
  background-color: #E5E7EB;
  box-shadow: #1F2937 6px -6px 0;
  padding: 0.8rem 1.5rem;
  white-space: nowrap;
  color: #1F2937;
  border: #1F2937 0.5px solid;
}

span.text-block {
  border: 2px solid #D4AF37;
  margin: 10px 5px;
  padding: 15px;
  display: inline-block;
  line-height: 1;
  background-color: #297589cc;
}

.hero-section {
  background: linear-gradient(
      rgba(91, 91, 91, 0.15),
      rgba(93, 93, 93, 0.15)
    ), url("../images/wall.webp");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

.border-thick {
  border-width: 3px;
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hero-title {
  font-size: min(64/1200*100vw, 64px);
}

.hero-sub-title {
  font-size: min(48/1200*100vw, 48px);
}

.sub-ttl {
  line-height: 2;
  white-space: nowrap;
  color: #111827;
}

.glass {
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  border-radius: 1em;
  padding: 1em 2em;
}

.seminar-date {
  white-space: nowrap;
  color: #1f2937;
  font-weight: 800;
  letter-spacing: .2em;
  letter-spacing: 0.5em;
}

/*
セミナー概要
-----------------------------*/
/* 触りやすいように変数化 */
.section-summary {
  background:
    linear-gradient(rgba(162, 80, 255, 0.194),
      rgba(0, 160, 204, 0.5)),
    url("../images/summary_back.png");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center 0;
  width: 100%;
  position: relative;
  overflow: hidden;
}

/*---------------- 各セクションのタイトル装飾 -------------------*/

.section-summary-ttl,
.introduction-ttl,
.recommended-ttl,
.seminar-ttl {
  z-index: 2;
}

.section-summary-ttl {
  text-shadow: 0 0 2px #800596;
}

.introduction-ttl {
  text-shadow: 0 0 2px #D97B36;
}

.recommended-ttl {
  text-shadow: 0 0 2px #3246A1;
}

.seminar-ttl {
  text-shadow: 0 0 2px #3246A1;
}

.section-summary-ttl:before {
  position: absolute;
  top: -2rem;
  left: 50%;
  transform: translateX(-50%);
  color: #e9e9ff;
  font-size: 4rem;
  text-transform: uppercase;
  content: 'summary';
  z-index: -1;
  text-shadow: none;
}

.introduction-ttl::before {
  position: absolute;
  top: -2rem;
  left: 50%;
  transform: translateX(-50%);
  color: #eae1da;
  font-size: 4rem;
  text-transform: uppercase;
  content: 'introduction';
  z-index: -1;
  text-shadow: none;
}

.recommended-ttl::before {
  position: absolute;
  top: -2rem;
  left: 50%;
  transform: translateX(-50%);
  color: #d2dfe3;
  font-size: 4rem;
  text-transform: uppercase;
  content: 'recommended';
  z-index: -1;
  text-shadow: none;
}

.seminar-ttl::before {
  position: absolute;
  top: -2rem;
  left: 50%;
  transform: translateX(-50%);
  color: #d2dfe3;
  font-size: 4rem;
  text-transform: uppercase;
  content: 'request';
  z-index: -1;
  text-shadow: none;
}

/*---------------- ここまで -------------------*/

.three-walls {
  padding: 4rem 3rem 3rem;
}

.wall-ttl {
  position: absolute;
  top: -2rem;
  left: 3rem;
  padding: 0.5rem 2rem;
  line-height: 2;
}

.number {
  border-bottom: 1px solid #3779ff;
  border-right: 1px solid #3779ff;
  line-height: 1;
  padding: 0.3em;
}

.triangle-point {
  width: 0;
  height: 0;
  border-left: 1.5em solid transparent;
  border-right: 1.5em solid transparent;
  border-top: 1.4em solid #4f4f4f;
  margin: 10px 1em;
}

.triangle-right {
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 6px;
  vertical-align: middle;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid #3ac4ff;
}

.triangle-down {
  width: 3rem;
  height: 3rem;
  border: 5px solid;
  border-color: transparent transparent #3779ff #3779ff;
  transform: rotate(-45deg);
  margin: -1.75rem auto 0;
}

.triangle-top {
  width: 3rem;
  height: 3rem;
  border: 5px solid;
  border-color: transparent transparent #3779ff #3779ff;
  transform: rotate(-45deg);
  margin: auto;
}

.summary-text {
  line-height: 1.6;
  margin: 3rem 0 4rem;
  position: relative;
  padding-bottom: 1em;
  border-bottom: 1px solid #3779ff;
  color: #313131;
  font-weight: 500;
  font-size: 1.8rem;
  text-align: center;
}

.summary-text span {
  font-weight: bold;
}

.summary-text::before {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) skew(-25deg);
  height: 20px;
  width: 10px;
  border-right: 1px solid #3779ff;
  background-color: #96cee8;
  content: "";
}

/*
  Recommend
=================================*/
.recommend-item {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2em;
}

.recommend-item li {
  display: flex;
  flex-direction: row;
  justify-content: left;
  align-items: center;
  gap: 1em;
  padding: 1em 1.5em;
  background: linear-gradient(135deg, #3676ff28, #33d3ff27);
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.15);
  border-radius: 1em;
}

.recommend-item img {
  width: 80px;
  height: auto;
}

/* Responsive utilities */
@media (max-width: 1220px) {
  .schedule {
    grid-area: schedule;
  }

  .person-left {
    grid-area: person-left;
  }

  .person-right {
    grid-area: person-right;
  }

  .fv-bottom {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "schedule schedule"
      "person-left person-right";
    gap: 0;
  }
}

@media (max-width: 1024px) {
  .pt-2 {
    padding: 2rem;
  }

  .hero-section {
    padding: 2rem 0;
  }

}

@media (min-width: 768px) {
  .md\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .md\:text-5xl {
    font-size: 3rem;
    line-height: 1.4;
  }

}

@media (min-width: 895px) {
  .lg\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lg\:grid-cols-12 {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .lg\:col-span-3 {
    grid-column: span 3 / span 3;
  }

  .lg\:col-span-6 {
    grid-column: span 6 / span 6;
  }
}

/*registration*/
section#registration {
  background:
    linear-gradient(rgba(0, 7, 138, 0.194),
      rgba(0, 153, 204, 0.2)),
    url("../images/market_back.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center 0;
  width: 100%;
  padding-top: 0;
  position: relative;
  padding-bottom: 100px;
}

section#registration .reverse {
  position: relative;
  height: min(100/750*100vw, 100px);
  width: 100%;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  background-color: #f4f4f4;
  top: -1px;
  left: 50%;
  right: 0;
  transform: translateX(-50%);
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
}

/* 横長スピーカーカード */
.speaker-card {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 2rem;
  border-radius: 1.5rem;
  background-image: linear-gradient(to bottom right, var(--tw-gradient-from, #f9fafb), var(--tw-gradient-to, #fff));
  box-shadow: 0 20px 35px -20px rgba(0, 0, 0, .25);
  margin-bottom: 2.5rem;
}

.speaker-card.reverse {
  flex-direction: row-reverse;
}

.speaker-photo {
  width: 176px;
  height: 176px;
  border-radius: 1rem;
  overflow: hidden;
  flex: 0 0 176px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, .12);
}

.speaker-body {
  flex: 1 1 auto;
}

.speaker-name {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: .5rem;
}

.badge {
  display: inline-block;
  padding: .5rem 1rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: .95rem;
  margin-bottom: 1rem;
}

.badge-blue {
  background: #dbeafe;
  color: #1d4ed8;
}

.badge-green {
  background: #d1fae5;
  color: #059669;
}

.speaker-desc {
  color: #4b5563;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.speaker-links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.link-blue,
.link-green {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .6rem .9rem;
  border-radius: .75rem;
  font-weight: 600;
  font-size: .9rem;
  transition: all .2s ease;
}

.link-blue {
  background: #eef4ff;
  color: #1d4ed8;
}

.link-blue:hover {
  background: #dbeafe;
}

.link-green {
  background: #ecfdf5;
  color: #047857;
}

.link-green:hover {
  background: #d1fae5;
}

.announcement {
  background: url("../images/announcement-back.png");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center 0;
  width: 100%;
}

.announcement p {
  line-height: 1.6;
}

.note {
  font-weight: bold;
  color: #ce2444;
}

.text-dotted {
  background-image: radial-gradient(circle at center, #fb8d3f 20%, transparent 20%);
  background-position: top right;
  background-repeat: repeat-x;
  background-size: 1em 0.3em;
  padding-top: .3em;
}

.triple-ray-angled {
  position: relative;
  display: inline-block;
  color: #7936ff;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-size: 2px 12px;
  background-position: center 0;
  line-height: 2;
}

.triple-ray-angled::before,
.triple-ray-angled::after {
  content: "";
  position: absolute;
  top: 4px;
  width: 2px;
  height: 10px;
  background: currentColor;
  pointer-events: none;
}

.triple-ray-angled::before {
  left: calc(50% - 14px);
  transform: rotate(-40deg);
}

.triple-ray-angled::after {
  left: calc(50% + 12px);
  transform: rotate(40deg);
}

.privacy a, a.link {
  display: inline-block;
  color: #7936ff;
  transition: ease 0.3s;
}

.privacy a:hover, a.link:hover {
  color: #00b1fd;
  text-decoration: underline;
}

#about {
  background-image: linear-gradient(45deg, #ececec6f 0%, #d1d1d16b 58%), url(../images/about.png);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

.logo img {
  padding-top: 8px;
  width: 180px;
  height: auto;
  vertical-align: middle;
}

a.logo:hover {
  opacity: 0.6;
}

.about-text {
  width: 70%;
}

@media (max-width: 768px) {
  html {
    font-size: min(30 / 750 * 100vw, 16px);
  }

  .hero-title {
    font-size: min(68/750*100vw, 68px);
    white-space: nowrap;
    padding: 0 15px 5px 10px;
  }

  .hero-title__last {
    margin-bottom: 0.8em;
  }

  .hero-sub-title {
    font-size: min(48/750*100vw, 48px);
    padding: 0 15px 5px 10px;
    margin-bottom: 0.2em;
  }

  .hero-sub-title.times {
    line-height: 1;
    display: block;
    font-size: min(68/750*100vw, 68px);
    margin: 0;
  }

  .sub-ttl {
    font-size: clamp(15px, 30/750*100vw, 30px);
  }

  span.enclosed {
    font-size: clamp(16px, 40/75*100vw, 40px);
  }

  .flex-shrink {
    flex-shrink: unset;
  }

  .explanation {
    font-size: clamp(14px, 30 / 750 * 100vw, 20px);
  }

  .summary-text {
    font-size: 1.5rem;
  }

  .recommend-item img {
    width: 60px;
    height: 60px;
  }

  .speaker-card,
  .speaker-card.reverse {
    flex-direction: column;
    text-align: center;
  }

  .speaker-photo {
    margin-bottom: .5rem;
  }

  .speaker-links {
    justify-content: center;
  }

  .speaker-name {
    justify-content: center;
  }

  .only-sp {
    display: block;
    line-height: 0;
    height: 0;
  }

  .on-sp {
    display: inline-block;
  }

  .on-pc {
    display: none;
  }

  .hero-section .date {
    flex-wrap: wrap;
    font-size: 2rem;
  }

  .person-left img,
  .person-right img {
    max-width: 200px;
    width: 90%;
  }

  .person-text {
    padding: 0.6rem 1rem;
  }

  #about .flex {
    flex-direction: column;
    gap: 1.5rem;
  }

  .about-text {
    width: 100%;
  }

}

@media (max-width: 570px) {
  .hero-section .date {
    display: grid;
    grid-template-columns: 0.6fr 1fr 0.5fr;
    grid-template-areas:
      "date-1 date-1 date-1"
      "date-2 date-2 date-3"
      "date-4 date-4 date-4";
  }

  .date-1 {
    grid-area: date-1;
  }

  .date-2 {
    grid-area: date-2;
  }

  .date-3 {
    grid-area: date-3;
  }

  .date-4 {
    grid-area: date-4;
  }

  .seminar-date {
    letter-spacing: 0.05em;
  }

  .hero-section .glass {
    padding: 1em 0;
    box-shadow: unset;
  }

  .fv-bottom {
    column-gap: 2rem;
  }

  .person-left img,
  .person-right img {
    max-width: 200px;
    width: 55%;
  }

  .person-right {
    text-align: left;
  }

  .person-left {
    text-align: right;
  }

  .person-text {
    text-align: center;
  }

  .person-text .text-lg {
    font-size: 0.8rem;
  }

  .person-text .text-sm {
    font-size: 0.5rem;
  }

  .hero-section .date .nowrap {
    white-space: normal;
  }

  .hero-section {
    padding: 3rem 1rem 1rem;
  }

  .hero-ttl {
    padding: 0 0 2rem;
  }

  .hero-section .text-4xl {
    line-height: 1.4;
  }

  .hero-section .text-big {
    font-size: 2.5rem;
    line-height: 1.4;
  }

  .hero-section span.text-block {
    font-size: 1.8rem;
    padding: 10px;
    margin: 6px;
  }

  .hero-section .btn {
    font-size: 1.2rem;
  }

  .hero-section .btn div.absolute {
    font-size: 1rem;
    top: -2rem;
    left: -1.8rem;
  }

  .date {
    margin-bottom: 0;
  }

  .point {
    padding: 1.5rem 2em;
    border-radius: 2rem;
  }

  .point h2 {
    font-size: 1.3rem;
  }

  .point li {
    font-size: 1rem;
  }

  .only-sp-s {
    display: block;
  }

  .assignment {
    font-size: clamp(20px, 28/750*100vw, 28px);
    line-height: 1.2;
  }

  .three-walls {
    padding: 3.3rem 2rem 2rem;
  }

  .wall-ttl {
    top: -1.8rem;
    left: 1rem;
    width: fit-content;
  }

  .introduction-ttl::before,
  .section-summary-ttl:before,
  .seminar-ttl::before,
  .recommended-ttl::before {
    font-size: 3rem;
    top: -1.5rem;
  }

  .section-summary-ttl,
  .introduction-ttl,
  .seminar-ttl {
    line-height: 1.2;
  }

  .assignment-list {
    flex-direction: column;
    gap: 0.5rem;
  }

  .announcement p {
    font-size: 1.8rem;
  }

  .announcement p.note {
    font-size: 0.9rem;
  }
}

@media (max-width: 489px) {
  .date .time {
    margin-top: -1rem;
  }

  .form-wrap {
    padding: 2rem;
  }
}

/* Icon styles */
.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  position: relative;
}

.icon-video {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpolygon points='23,7 16,12 23,17 23,7'/%3E%3Crect x='1' y='5' width='15' height='14' rx='2' ry='2'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.icon-arrow-right {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFFFFF' stroke-width='2'%3E%3Cline x1='5' y1='12' x2='19' y2='12'/%3E%3Cpolyline points='12,5 19,12 12,19'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.icon-check-circle {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M22 11.08V12a10 10 0 1 1-5.93-9.14'/%3E%3Cpolyline points='22,4 12,14.01 9,11.01'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.icon-check {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23009DA0' stroke-width='3'%3E%3Cpolyline points='20,6 9,17 4,12'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.icon-website {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='currentColor' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpath d='M2 12h20M12 2a15.3 15.3 0 0 1 0 20M12 2a15.3 15.3 0 0 0 0 20'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: clamp(20px, 4vw, 32px);
  right: clamp(20px, 4vw, 32px);
  background-color: #3ac4ff;
  color: white;
  border: none;
  border-radius: 50%;
  width: clamp(48px, 8vw, 56px);
  height: clamp(48px, 8vw, 56px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  z-index: 50;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: #00b1fd;
  transform: scale(1.1);
}

/* slow fade base */
.slow-fade {
  opacity: 0;
  transition: opacity 1.6s ease;
}

.slow-fade.is-visible {
  opacity: 1;
}