:root{
    --hero-h: 100vh;
    --bg-dark-1: rgba(8, 18, 35, 0.16);
    --bg-dark-2: rgba(8, 18, 35, 0.42);
    --text-shadow: 0 8px 24px rgba(0,0,0,.28);
    --settle-duration: 1.4s cubic-bezier(.22,.8,.22,1);
  }

  *{
    box-sizing:border-box;
  }

  html, body{
    margin:0;
    padding:0;
  }

  body{
    font-family:
      "Hiragino Sans",
      "Yu Gothic",
      "YuGothic",
      sans-serif;
    background:#081223;
    color:#fff;
  }

html, body {
  overflow-x: hidden;
}

.iab-hero {
  position: relative;
  overflow: hidden;
}

.iab-hero__warp{
  inset:-8%;
}

.iab-hero__bg{
  position:absolute;
  inset:0;
  background: url("../images/shonai.webp") center center / cover no-repeat;
  transform:scale(1.03);
  opacity:1;
  z-index:-6;
}

/* フェード用の黒レイヤー */
.iab-hero__bg::after{
  content:"";
  position:absolute;
  inset:0;
  background:#081223;
  z-index:1;
  animation:bgFadeOut 1.6s ease-out forwards;
}

@keyframes bgFadeOut{
  from{
    opacity:1;
  }
  to{
    opacity:0;
  }
}

.iab-hero__bg img{
  width:100%;
  height:100%;
  object-fit:cover;

  transform:scale(1.08);
}
.iab-hero__overlay{
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(8, 18, 35, 0.30),
    rgba(8, 18, 35, 0.52)
  );
  z-index: -5;
  opacity: 1;
  animation: overlayLighten 3s ease-out 4.5s forwards;
}
  .iab-hero__vignette{
    position:absolute;
    inset:0;
    background:
      radial-gradient(circle at center, rgba(255,255,255,.05) 0%, rgba(255,255,255,0) 32%),
      radial-gradient(circle at center, rgba(8,18,35,0) 42%, rgba(8,18,35,.16) 76%, rgba(8,18,35,.38) 100%);
    z-index:-5;
    pointer-events:none;
  }

  .iab-hero__warp{
    position:absolute;
    inset:-24%;
    z-index:10;
    pointer-events:none;
    opacity:0;
    transform:scale(.18);
    transform-origin:center center;
    background:
      repeating-conic-gradient(
        from 0deg,
        rgba(255,255,255,.12) 0deg 1.2deg,
        rgba(255,255,255,.04) 1.2deg 2deg,
        transparent 2deg 9deg
      );
    filter:blur(16px);
    mix-blend-mode:screen;
    animation:warpBurst 5.8s ease-out forwards;
  }

  .iab-hero__warp::before{
    content:"";
    position:absolute;
    inset:16%;
    background:
      radial-gradient(circle at center,
        rgba(255,255,255,.18) 0%,
        rgba(255,255,255,.07) 18%,
        rgba(255,255,255,0) 46%);
    filter:blur(10px);
  }

  .iab-hero__inner{
    position:relative;
    min-height:100vh;
    width:min(1400px, 100%);
    margin:0 auto;
    padding:30px 20px 40px;
  }

  .iab-hero__logo{
    position:absolute;
    top:41%;
    left:50%;
    width:min(26vw, 310px);
    transform:translate(-50%, -50%);
    z-index:30;
  animation:logoFadeIn 1.6s ease-out 1.2s both;
  }

  .iab-hero__logo::before{
    content:"";
    position:absolute;
    inset:-70px;
    border-radius:50%;
    background:
      radial-gradient(circle,
        rgba(255,255,255,.98) 0%,
        rgba(255,255,255,.78) 18%,
        rgba(255,255,255,.34) 42%,
        rgba(255,255,255,0) 74%);
    filter:blur(36px);
    z-index:-1;
    pointer-events:none;
    animation:logoGlow 5s ease-in-out infinite;
  }

  .iab-hero__logo img{
    display:block;
    width:100%;
    height:auto;
    position:relative;
    z-index:2;
  }

  .iab-hero__copy{
    position:absolute;
    left:50%;
    top:63%;
    transform:translateX(-50%);
    width:min(760px, calc(100% - 36px));
    text-align:center;
    z-index:31;
  animation:copyFadeIn 1.4s ease-out 1.6s both;
  }
.iab-hero__copy::before{
  content:"";
  position:absolute;

  left:50%;
  top:50%;
  transform:translate(-50%,-50%);

  width:110%;
  height:160%;

  background:radial-gradient(
    ellipse at center,
    rgba(8,18,35,.55) 0%,
    rgba(8,18,35,.35) 40%,
    rgba(8,18,35,.12) 70%,
    rgba(8,18,35,0) 100%
  );

  filter:blur(20px);

  z-index:-1;
}
  .iab-hero__copy h1{
    margin:0 0 14px;
    font-size:clamp(2rem, 5vw, 4.6rem);
    line-height:1.08;
    letter-spacing:.04em;
    text-shadow:var(--text-shadow);
    font-weight:700;
  }

  .iab-hero__copy p{
    margin:0 0 26px;
    font-size:clamp(.98rem, 1.6vw, 1.18rem);
    line-height:1.9;
    text-shadow:0 4px 16px rgba(0,0,0,.28);
  }

  .iab-hero__button{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-width:320px;
    padding:15px 28px;
    border-radius:999px;
    border:1px solid rgba(255,255,255,.42);
    background:rgba(255,255,255,.10);
    color:#fff;
    text-decoration:none;
    font-weight:800;
    font-size:1.1rem;
    backdrop-filter:blur(8px);
    -webkit-backdrop-filter:blur(8px);
    box-shadow:0 8px 26px rgba(0,0,0,.14);
    transition:transform .3s ease, background .3s ease, border-color .3s ease;
  }

  .iab-hero__button:hover{
    transform:translateY(-2px);
    background:rgba(255,255,255,.18);
    border-color:rgba(255,255,255,.68);
  }

  .iab-timemachine{
    position:absolute;
    inset:0;
    z-index:18;
    pointer-events:none;
    overflow:hidden;
    transition:opacity var(--settle-duration), visibility var(--settle-duration);
  }

.iab-stream{
  position:absolute;
  top:50%;
  left:50%;
  width:clamp(130px, 15vw, 250px);
  aspect-ratio:4 / 3;
  opacity:0;
  transform:translate(-50%, -50%) scale(.06);
  will-change:transform, opacity;
  animation-name:radialFly;
  animation-timing-function:cubic-bezier(.18,.62,.2,1);
  animation-fill-mode:both;
  animation-iteration-count:1;
}

  .iab-stream--wide{
    width:clamp(170px, 18vw, 310px);
    aspect-ratio:16 / 9;
  }

  .iab-stream--vertical{
    width:clamp(115px, 12vw, 200px);
    aspect-ratio:3 / 4;
  }

  .iab-stream img{
    display:block;
    width:100%;
    height:100%;
    object-fit:cover;
    border-radius:0;
    box-shadow:0 20px 54px rgba(0,0,0,.22);
  }

  .iab-hero__afterglow{
    position:absolute;
    inset:0;
    z-index:12;
    pointer-events:none;
    opacity:0;
    transition:opacity var(--settle-duration);
    background:
      radial-gradient(circle at center, rgba(255,255,255,.11), rgba(255,255,255,0) 34%);
  }

  .iab-hero.is-settled .iab-timemachine{
    opacity:0;
    visibility:hidden;
  }

  .iab-hero.is-settled .iab-hero__warp{
    opacity:.05;
    animation:none;
    transform:scale(2.2);
  }

  .iab-hero.is-settled .iab-hero__afterglow{
    opacity:1;
  }

  .iab-scroll{
    position:absolute;
    left:50%;
    bottom:22px;
    transform:translateX(-50%);
    z-index:35;
    font-size:.82rem;
    letter-spacing:.12em;
    text-transform:uppercase;
    opacity:.82;
    text-shadow:0 2px 12px rgba(0,0,0,.35);
    animation:scrollFade 2s ease 1.4s both;
  }

  .iab-scroll::after{
    content:"";
    display:block;
    width:1px;
    height:28px;
    margin:8px auto 0;
    background:rgba(255,255,255,.72);
    animation:scrollLine 1.8s ease-in-out infinite;
  }

@keyframes bgReveal{
  0%{
    opacity: 0;
    transform: scale(1.12);
    filter: blur(12px);
  }
  100%{
    opacity: 1;
    transform: scale(1.03);
    filter: blur(0);
  }
}

@keyframes overlayLighten{
  0%{
    opacity: 1;
  }
  100%{
    opacity: 0.05;
  }
}
@keyframes bgBrighten{

  0%{
    filter:brightness(.85) saturate(.95);
  }

  100%{
    filter:brightness(1.1) saturate(1.08);
  }

}

  @keyframes logoFadeIn{
    from{
      opacity:0;
      transform:translate(-50%, -50%) scale(.86);
      filter:blur(10px);
    }
    to{
      opacity:1;
      transform:translate(-50%, -50%) scale(1);
      filter:blur(0);
    }
  }

  @keyframes copyFadeIn{
    from{
      opacity:0;
      transform:translateX(-50%) translateY(24px);
    }
    to{
      opacity:1;
      transform:translateX(-50%) translateY(0);
    }
  }

  @keyframes logoGlow{
    0%, 100%{
      transform:scale(1);
      opacity:.96;
    }
    50%{
      transform:scale(1.08);
      opacity:1;
    }
  }

  @keyframes warpBurst{
    0%{
      opacity:0;
      transform:scale(.16);
    }
    12%{
      opacity:.34;
    }
    46%{
      opacity:.30;
      transform:scale(1.25);
    }
    75%{
      opacity:.18;
      transform:scale(1.95);
    }
    100%{
      opacity:.08;
      transform:scale(2.35);
    }
  }

@keyframes radialFly{
  0%{
    opacity:0;
    transform:translate(var(--start-x), var(--start-y)) scale(.08);
  }
  12%{
    opacity:.92;
  }
  100%{
    opacity:0;
    transform:translate(var(--end-x), var(--end-y)) scale(2.9);
  }
}

  @keyframes scrollFade{
    from{
      opacity:0;
      transform:translateX(-50%) translateY(8px);
    }
    to{
      opacity:.82;
      transform:translateX(-50%) translateY(0);
    }
  }

  @keyframes scrollLine{
    0%, 100%{
      transform:scaleY(.45);
      opacity:.45;
    }
    50%{
      transform:scaleY(1);
      opacity:1;
    }
  }

  @media (max-width: 1024px){
    .iab-hero__logo{
      width:min(34vw, 240px);
      top:38%;
    }

    .iab-hero__copy{
      top:58%;
    }
  }

  @media (max-width: 768px){
    .iab-hero,
    .iab-hero__inner{
      min-height:100svh;
    }

    .iab-hero__inner{
      padding:20px 14px 30px;
    }

    .iab-hero__logo{
      width:156px;
      top:30%;
    }

    .iab-hero__logo::before{
      inset:-42px;
      filter:blur(24px);
    }

    .iab-hero__copy{
      top:50%;
      width:min(92%, 520px);
    }

    .iab-hero__copy h1{
      font-size:clamp(1.75rem, 8vw, 2.7rem);
      margin-bottom:10px;
    }

    .iab-hero__copy p{
      font-size:.94rem;
      line-height:1.75;
      margin-bottom:20px;
    }

    .iab-hero__button{
      min-width:unset;
      width:100%;
      max-width:550px;
      padding:14px 20px;
    }

    .iab-stream{
      width:112px;
    }

    .iab-stream--wide{
      width:148px;
    }

    .iab-stream--vertical{
      width:94px;
    }

    .iab-scroll{
      bottom:14px;
      font-size:.72rem;
    }
  }

  @media (prefers-reduced-motion: reduce){
    .iab-hero__logo,
    .iab-hero__copy,
    .iab-stream,
    .iab-scroll,
    .iab-scroll::after,
    .iab-hero__warp,
    .iab-hero__logo::before{
      animation:none !important;
      transition:none !important;
    }

    .iab-timemachine{
      display:none !important;
    }

    .iab-hero__afterglow{
      opacity:1;
    }
  }


/* greeting */

.greeting-section {
  background: #fefefe;
  padding: 100px 24px;
}

.greeting-section__inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(360px, 520px);
  gap: 64px;
  align-items: start;
}

.greeting-section__content {
  padding-top: 8px;
}

.greeting-section__label {
  display: inline-block;
  margin: 0 0 36px;

  color: #1d2087;
  font-size: 22pt;
  font-weight: 600;

}

.greeting-section__title {
  margin: 0 0 40px;
  color: #18233d;
  font-size: clamp(2.6rem, 4vw, 4.8rem);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.greeting-section__text p {
  margin: 0 0 28px;
  color: #333333;
  font-size: 1.0rem;
  line-height: 2;
}

.greeting-section__text p:last-child {
  margin-bottom: 0;
}

.greeting-card {
  /*background: #162745;*/
  color: #162745;
  border-radius: 32px;
  padding: 48px 48px 42px;
  box-sizing: border-box;
}

.greeting-card__label {
  margin: 0 0 28px;
  color: rgba(255,255,255,0.7);
  font-size: 1.rem;
  letter-spacing: 0.06em;
  font-weight: 500;
}

.greeting-card__message {
  margin: 0 0 42px;
  font-size: 1.9rem;
  line-height: 1.9;
  font-weight: 400;
}

.greeting-card__author {
  display: flex;
  align-items: center;
  gap: 18px;
}

.greeting-card__icon {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: #f2a100;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  font-weight: 700;
  flex-shrink: 0;
}

.greeting-card__meta p {
  margin: 0;
}

.greeting-card__name {
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1.4;
}

.greeting-card__role {
  margin-top: 4px;
  font-size: 1.2rem;
  color: #162745;
}

@media (max-width: 980px) {
  .greeting-section {
    padding: 48px 20px;
  }

  .greeting-section__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .greeting-card {
    padding: 36px 28px 32px;
    border-radius: 24px;
  }

  .greeting-card__message {
    font-size: 1.7rem;
    line-height: 1.8;
  }
}

@media (max-width: 640px) {
  .greeting-section__label {
    margin-bottom: 24px;
    font-size: 1.5rem;
    padding: 8px 0px;
  }

  .greeting-section__title {
    margin-bottom: 28px;
    font-size: 3.2rem;
    line-height: 1.25;
  }

  .greeting-section__text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.9;
  }

  .greeting-card__icon {
    width: 60px;
    height: 60px;
    font-size: 1.8rem;
  }

  .greeting-card__name {
    font-size: 1.2rem;
  }
  .greeting-card__role {
    font-size: 1.1rem;
  }
}


/* =========================
   IAB PEOPLE
========================= */

.iab-message {
  background: #f5f4f1;
  padding: 120px 0 140px;
}

.iab-message__inner {
  width: min(1400px, calc(100% - 80px));
  margin: 0 auto;
}

.iab-message__heading {
  margin-bottom: 56px;
}

.iab-message__heading h2 {
  margin: 0;
  font-size: clamp(2.5rem, 3vw, 3.4rem);
  line-height: 0.95;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #111;
}

.iab-message__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 52px 36px;
  align-items: start;
}

.iab-message-card {
  max-width: 280px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity 0.9s ease,
    transform 0.9s ease;
}

.iab-message-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.iab-message-card:nth-child(2) {
  transition-delay: 0.08s;
}

.iab-message-card:nth-child(3) {
  transition-delay: 0.16s;
}

.iab-message-card:nth-child(4) {
  transition-delay: 0.24s;
}

.iab-message-card__image {
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: #ddd;
}

.iab-message-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.8s ease;
}

.iab-message-card:hover .iab-message-card__image img {
  transform: scale(1.03);
}

.iab-message-card__body {
  padding-top: 18px;
}

.iab-message-card__name {
  margin: 0 0 6px;
  font-size: clamp(1.5rem, 1.8vw, 1.9rem);
  line-height: 1.35;
  font-weight: 700;
  color: #111;
}

.iab-message-card__title {
  margin: 0 0 16px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: #777;
}

.iab-message-card__excerpt {
  margin: 0 0 16px;
  font-size: 1.1rem;
  line-height: 1.9;
  color: #666;
}

.iab-message-card__more {
  appearance: none;
  border: 0;
  background: none;
  padding: 0;
  font-size: 0.88rem;
  line-height: 1;
  color: #222;
  cursor: pointer;
  text-align: left;
  letter-spacing: 0.03em;
  position: relative;
}

.iab-message-card__more::after {
  content: "";
  display: block;
  width: 0;
  height: 1px;
  background: #222;
  margin-top: 8px;
  transition: width 0.3s ease;
}

.iab-message-card__more:hover::after {
  width: 92px;
}

/* =========================
   Modal
========================= */

.iab-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.iab-modal.is-open {
  opacity: 1;
  pointer-events: auto;
}

.iab-modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(17, 17, 17, 0.55);
}

.iab-modal__dialog {
  position: relative;
  width: min(1080px, calc(100% - 40px));
  max-height: calc(100vh - 60px);
  margin: 30px auto;
  background: #fff;
  overflow: auto;
  padding: 54px 42px 42px;
  box-sizing: border-box;
  transform: translateY(24px);
  transition: transform 0.35s ease;
}

.iab-modal.is-open .iab-modal__dialog {
  transform: translateY(0);
}

.iab-modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  appearance: none;
  border: 0;
  background: none;
  padding: 0;
  font-size: 2rem;
  line-height: 1;
  color: #111;
  cursor: pointer;
}

.iab-modal__content {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 42px;
  align-items: start;
}

.iab-modal__image img {
  width: 100%;
  height: auto;
  display: block;
}

.iab-modal__name {
  margin: 0 0 8px;
  font-size: clamp(2rem, 2.2vw, 2.6rem);
  line-height: 1.3;
  font-weight: 700;
  color: #111;
}

.iab-modal__title {
  margin: 0 0 26px;
  font-size: 1rem;
  line-height: 1.8;
  color: #777;
}

.iab-modal__body {
  font-size: 1rem;
  line-height: 2;
  color: #333;
}

.iab-modal__body p:first-child {
  margin-top: 0;
}

body.iab-modal-open {
  overflow: hidden;
}

/* =========================
   Responsive
========================= */

@media (max-width: 1200px) {
  .iab-message__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 44px 28px;
  }

  .iab-message-card {
    max-width: 300px;
  }
}

@media (max-width: 767px) {
  .iab-message {
    padding: 80px 0 96px;
  }

  .iab-message__inner {
    width: calc(100% - 32px);
  }

  .iab-message__heading {
    margin-bottom: 36px;
  }

  .iab-Fmessage__heading h2 {
    font-size: 2.8rem;
  }

  .iab-message__grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .iab-message-card {
    max-width: 100%;
  }

  .iab-message-card__image {
  width:70%;
}
  .iab-message-card__body {
    padding-top: 14px;
  }

  .iab-message-card__name {
    font-size: 1.6rem;
  }

  .iab-modal__dialog {
    width: calc(100% - 20px);
    max-height: calc(100vh - 20px);
    margin: 10px auto;
    padding: 48px 20px 24px;
  }

  .iab-modal__content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .iab-modal__name {
    font-size: 1.8rem;
  }
}


/* =========================
   NEWS & EVENTS
   ========================= */
.iab-news{
  padding: 110px 0;
  background: #fefefe;
}

.iab-news__inner{
  width: min(1400px, calc(100% - 80px));
  margin: 0 auto;
}
.iab-news__heading {
  margin-bottom: 56px;
}

.iab-news__inner h2.iab-news__title {
  margin: 0 0 50px;
  font-size: clamp(2.2rem, 2.8vw, 3rem);
  line-height: 0.95;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #111;
}

.iab-news__list{
  display: flex;
  flex-direction: column;
  gap: 0;
}

.iab-news__item{
  padding: 0 0 30px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.12);
}

.iab-news__meta{
  margin: 0 0 14px;
  font-size: 1.1rem;
  line-height: 1.8;
  letter-spacing: 0.08em;
  color: #666;
}

.iab-news__headline{
  margin: 0 0 10px;
  font-size: clamp(0.9rem, 1.2vw, 1.5rem);
  color: #444;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.04em;
}

.iab-news__text{
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.9;
  color: #444;
}

/* =========================
   SP
   ========================= */
@media (max-width: 767px){
  .iab-news{
    padding: 80px 0;
  }

  .iab-news__inner{
    width: calc(100% - 40px);
  }

  .iab-news__title{
    margin-bottom: 32px;
  }

  .iab-news__item{
    padding-bottom: 24px;
  }

  .iab-news__meta{
    margin-bottom: 10px;
    font-size: 1.1rem;
  }

  .iab-news__headline{
    font-size: 1.3rem;
    line-height: 1.7;
  }

  .iab-news__text{
    font-size: 1.1rem;
    line-height: 1.4;
  }
}


/* to top */

html {
  scroll-behavior: smooth;
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 9999;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 999px;
  background: rgba(216, 149, 17, 0.95);
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.16);
  transition:
    transform 0.2s ease,
    opacity 0.2s ease,
    background 0.2s ease;
}

.back-to-top:hover {
  transform: translateY(-3px);
  background: rgba(190, 126, 9, 0.98);
}

.back-to-top:focus-visible {
  outline: 2px solid #0f1830;
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .back-to-top {
    right: 14px;
    bottom: 14px;
    width: 46px;
    height: 46px;
    font-size: 20px;
  }
}
.back-to-top {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}