@charset "utf-8";
/* COMMON */
#oit-hpa-site {
  all: initial;
  box-sizing: border-box;
  background: #fff;
  color-scheme: light;
  isolation: isolate;
  overflow-x: hidden;
  --oit-blue: #064583;
  --deep-blue: #032a51;
  --ink: #0b1d2d;
  --cyan: #00b9dc;
  --sky: #dff5fb;
  --mist: #f3f8fa;
  --white: #fff;
  --gold: #f6c64a;
  --line: rgba(255, 255, 255, .26);
  --text-muted: #5e7180;
  --shadow: 0 24px 64px rgba(3, 42, 81, .16);
  --content: min(1180px, calc(100vw - 48px));
}

#oit-hpa-site *, 
#oit-hpa-site *::before, 
#oit-hpa-site *::after{
  box-sizing: border-box;
}

html.oit-hpa-document { scroll-behavior: smooth; }
body.oit-hpa-page {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-size: 16px;
  font-weight: 400;
  font-family: "Noto Sans JP", "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
  line-height: 1.75;
  letter-spacing: normal;
  color: var(--ink);
}

#oit-hpa-site img { 
  display: block; 
  width: 100%; 
  height: auto; 
  vertical-align: top;
}
#oit-hpa-site a { 
  color: inherit; 
  text-decoration: none; 
}
#oit-hpa-site button { font: inherit; }
#oit-hpa-site .container { 
  width: var(--content); 
  margin-inline: auto; 
}
#oit-hpa-site section[id] {/* scroll-margin-top: 76px; */}

#oit-hpa-site .eyebrow {
  margin: 0 0 clamp(10px, 2vw, 14px);
  color: var(--gold);
  font-size: .74rem;
  line-height: 1.2;
  letter-spacing: .22em;
  text-transform: uppercase;
}
#oit-hpa-site .section-title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
}

#oit-hpa-site .section-lead {
  color: var(--text-muted);
  font-size: clamp(1rem, 1.8vw, 1.1rem);
  line-height: 1.7;
}

#oit-hpa-site .header {
  position: fixed;
  z-index: 100;
  top: 0;
  left: 0;
  width: 100%;
  padding: 16px 0;
  background-color: transparent;
  color: #fff;
  transition: background ease-in-out .3s;
}    
#oit-hpa-site .header-inner {
  display: flex;
  flex-direction: row;
  align-items: center;
  padding-inline: clamp(20px, 4vw, 40px);
}
#oit-hpa-site .brand-logo {
  position: relative;
  z-index: 15;
  display: block;
  flex-shrink: 0;
  max-width: 200px;
  max-height: 44px;
  margin-right: auto;
  transition: all ease-in-out .3s;
}
#oit-hpa-site .brand-logo img {
  transiiton: opacity ease-in-out .3s;
}
/* header sticky */
#oit-hpa-site .header.sticky {
  background-color: rgba(255, 255, 255, .65);
  backdrop-filter: blur(10px);
  color: var(--deep-blue);
}
#oit-hpa-site .header.sticky .brand-logo {
  max-width: 144px;
  max-height: 32px;
  background: url('../img/common/logo_oit.webp') top left no-repeat;
  background-size: 144px 32px;
}
#oit-hpa-site .header.sticky .brand-logo img {
  opacity: 0;
}

#oit-hpa-site ul.gnavs { 
  list-style: none; 
  margin: 0;
  padding: 0;
  display: flex; 
  flex-direction: row; 
  align-items: center; 
  gap: clamp(16px, 1.8vw, 24px); 
}
#oit-hpa-site ul.gnavs li {
  flex-shrink: 0; 
}
#oit-hpa-site ul.gnavs li a:not(.nav-donation) {
  position: relative;
  display: block;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .08em;
  transition: opacity ease-in-out .3s;
}
@media (hover:hover) {
  #oit-hpa-site ul.gnavs li a:not(.nav-donation):hover {
    opacity: 0.5;
  }
}
#oit-hpa-site ul.gnavs li a:focus-within {
  opacity: 0.5;
}

#oit-hpa-site .nav-cta {
  flex: 0 0 auto;
  padding: 4px 8px;
  font-weight: 600;
  color: var(--deep-blue);
  background: var(--gold);
}

#oit-hpa-site .nav-donation {
  padding: 4px 8px;
  color: var(--white);
  background-color: var(--oit-blue);
  box-shadow: 2px 2px 0px var(--gold);
  transition: background ease-in-out .3s, color ease-in-out .3s;
  opacity: 1;
  font-size: .85rem;
  letter-spacing: .08em;
}
#oit-hpa-site .nav-donation::after { display: none; }
@media (hover:hover) {
  #oit-hpa-site .nav-donation:hover { 
    background: var(--gold); 
    box-shadow: 0px 0px 0px var(--gold); 
    color: var(--deep-blue); 
  }
}

#oit-hpa-site .menu-button {
  display: none;
}

#oit-hpa-site .hero {
  position: relative;
  display: grid;
  height: 100vh;
  min-height: 560px;
  max-height: 1080px;
  color: var(--white);
  overflow: hidden;
	z-index: -1;
}
#oit-hpa-site .hero-slides {
  position: absolute;
  z-index: -1;
  inset: 0;
}
#oit-hpa-site .hero-slide {
  position: absolute;
  inset: 0;  
  display: flex;
  align-items: center;
  justify-content: center;
}
#oit-hpa-site .hero-slide img {
  object-fit: cover;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  opacity: 0;
  transform: scale(1.045);
  transition: opacity 1.15s ease, transform 7s ease;
}
#oit-hpa-site .hero-slide.is-active img { opacity: 1; transform: scale(1); }
#oit-hpa-site .hero-overlay {
  position: absolute;
  z-index: 1;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(2,25,48,.5) 0%, rgba(2,25,48,.14) 48%, transparent 72%),
    linear-gradient(180deg, rgba(2,25,48,.58) 0%, rgba(3,42,81,.08) 32%, transparent 55%, rgba(2,25,48,.82) 100%);
}

#oit-hpa-site .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px 24px;
  border: 1px solid rgba(255,255,255,.36);
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .06em;
  transition: transform .2s ease, background .2s ease, color .2s ease;
}
#oit-hpa-site .button:hover { transform: translateY(2px); background-color: var(--deep-blue)!important; color: var(--white)!important; }
#oit-hpa-site .button-primary { color: var(--deep-blue); background: var(--white); border-color: var(--white); }
#oit-hpa-site .button-primary::after { color: var(--cyan); content: "→"; }
#oit-hpa-site .button-ghost::after { content: "↓"; }

#oit-hpa-site .hero-event {
  width: min(360px, 34vw);
  color: var(--deep-blue);
  background: rgba(255,255,255,.96);
  border-top: 8px solid var(--gold);
  box-shadow: 0 28px 74px rgba(0,0,0,.24);
}
#oit-hpa-site .hero-event-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  color: var(--white);
  background: var(--oit-blue);
  font: 800 .68rem/1.2 Roboto, sans-serif;
  letter-spacing: .13em;
}
#oit-hpa-site .hero-event-head span:last-child{ color: var(--gold); }
#oit-hpa-site .hero-event-body{ padding: 28px 28px 30px; }
#oit-hpa-site .hero-event-kicker{ margin: 0 0 8px; color: var(--oit-blue); font-size: .78rem; font-weight: 800; letter-spacing: .08em; }
#oit-hpa-site .hero-event h2{ margin: 0; font-size: clamp(1.75rem, 3vw, 2.7rem); line-height: 1.12; letter-spacing: -.04em; }
#oit-hpa-site .hero-event-date{ display: flex; align-items: baseline; gap: 10px; margin: 22px 0 0; color: var(--oit-blue); }
#oit-hpa-site .hero-event-date b{ font: 800 1.8rem/1 Roboto, sans-serif; letter-spacing: -.04em; }
#oit-hpa-site .hero-event-date span{ color: var(--text-muted); font-size: .7rem; font-weight: 600; }
#oit-hpa-site .hero-event-note{ margin: 14px 0 0; color: var(--text-muted); font-size: .76rem; line-height: 1.65; }
#oit-hpa-site .hero-event-link{
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
  margin-top: 22px;
  padding: 0 18px;
  color: var(--white);
  background: var(--deep-blue);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .06em;
}
#oit-hpa-site .hero-event-link span{ color: var(--cyan); }
#oit-hpa-site .slide-controls{
  position: absolute;
  z-index: 4;
  bottom: 34px;
  left: 50%;
  display: flex;
  align-items: center;
  gap: 10px;
  width: var(--content);
  transform: translateX(-50%);
}
#oit-hpa-site .hero-caption{
  position: absolute;
  z-index: 4;
  bottom: 40px;
  left: 40px;
  pointer-events: none;
}
#oit-hpa-site .hero-title {
  margin: 0 0 16px;
  color: #f1f1f1;
}
#oit-hpa-site .hero-title span { display: block; }
#oit-hpa-site .hero-title .hero-title-school{
  margin-bottom: 12px;
  font-size: clamp(.84rem, 1.2vw, 1.05rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .16em;
  text-shadow: 0 1px 10px rgba(0,0,0,.35);
}
#oit-hpa-site .hero-title .hero-title-project {
  font-size: clamp(2.4rem, 5vw, 5rem);
  font-weight: 600;
  line-height: 1.1;
  text-shadow: 0 5px 16px rgba(0,0,0,.35), 0 2px 4px rgba(0,0,0,.35);
}

#oit-hpa-site .hero-title-en{
  color: #f1f1f1;
  font-size: clamp(.66rem, .9vw, .84rem);
  letter-spacing: .18em;
  text-transform: uppercase;
  text-shadow: 0 2px 10px rgba(0,0,0,.35);
  margin: 16px 0 0 0;
}
#oit-hpa-site .hero-title-en span{ display: block; }

#oit-hpa-site .hero-broadcast{
  position: absolute;
  z-index: 5;
  top: 100px;
  right: 32px;
  display: flex;
  justify-content: flex-end;
}
#oit-hpa-site .hero-broadcast-card {
  max-width: 380px;
  padding: 16px;
  color: var(--ink);
  background: linear-gradient(135deg, #ffe900, #ffc92f);
  border: 2px solid #fff4a8;
  backdrop-filter: blur(9px);
}
#oit-hpa-site .hero-broadcast h2 {
  margin: 0px 0 0;
  font-size: clamp(1.25rem, 1.6vw, 1.6rem);
  line-height: 1.2;
}
#oit-hpa-site .hero-broadcast-date{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  color: var(--ink);
}
#oit-hpa-site .hero-broadcast-date strong{
  font-size: clamp(1.3rem, 1.6vw, 1.6rem);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}
#oit-hpa-site .hero-broadcast-date span{ font-size: clamp(.76rem, 1vw, 1rem); font-weight: 800; white-space: nowrap; }
#oit-hpa-site .hero-broadcast-date em{
  color: #d71920;
  font-size: 2em;
  font-style: normal;
  -webkit-text-stroke: 1px #151515;
  paint-order: stroke fill;
}
#oit-hpa-site .hero-broadcast-network{ position: relative; z-index: 1; margin: 8px 0 0; font-size: .66rem; font-weight: 800; letter-spacing: .04em; }
#oit-hpa-site .hero-broadcast-link{
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  padding: 8px 16px;
  color: var(--white);
  background: var(--deep-blue);
  border: 1px solid var(--deep-blue);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .06em;
  transition: background ease-in-out .3s, color ease-in-out .3s;
}
#oit-hpa-site .hero-broadcast-link::after{ 
  content: '→';
  color: var(--gold); 
  transform: rotate(-45deg);
  transition: color ease-in-out .3s;
}

/* 放送前後 9/2 22:00切り替え */
#info-card {}
#info-card .hero-broadcast-card:nth-child(1) {display: block}
#info-card .hero-broadcast-card:nth-child(2) {display: none;}
#info-card.after-tv .hero-broadcast-card:nth-child(1) {display: none}
#info-card.after-tv .hero-broadcast-card:nth-child(2) {display: block;}

#oit-hpa-site .hero-broadcast-card {
}
#oit-hpa-site .hero-broadcast-card figure {
	background: url(../img/win-banner_bg.webp) center center no-repeat;
	background-size: cover;
	position: relative;
	height: 170px;
	width: 280px;
	margin: 0;
}
#oit-hpa-site .hero-broadcast-card figure img {
	position: absolute;
	top: -2%; left: -2%;
	width: 50%; height: auto;
}

@media (hover:hover) {
  #oit-hpa-site .hero-broadcast-link:hover {
    background: transparent;
    color: var(--deep-blue);
  }
  #oit-hpa-site .hero-broadcast-link:hover::after {
    color: var(--deep-blue);
  }
}

#oit-hpa-site .slide-dot{
  width: 42px;
  height: 3px;
  padding: 0;
  background: rgba(255,255,255,.34);
  border: 0;
  cursor: pointer;
  transition: background-color .25s ease, width .25s ease;
}
#oit-hpa-site .slide-dot[aria-current="true"]{ width: 72px; background: var(--cyan); }
#oit-hpa-site .slide-toggle{
  display: grid;
  width: 28px;
  height: 28px;
  margin-left: 5px;
  place-items: center;
  color: var(--white);
  background: transparent;
  border: 1px solid rgba(255,255,255,.42);
  border-radius: 50%;
  cursor: pointer;
  font-size: .62rem;
}

#oit-hpa-site .lp-intro { padding: 72px 0 100px; background-color: #f1f1f1; }

#oit-hpa-site .champion-banner {
  position: relative;
  max-width: 1200px;
  max-height: 630px;
  aspect-ratio: 16 / 9;
  background: url("../img/win-banner_bg.webp") center center no-repeat;
  background-size: cover;
  margin: 0;
  padding: 0;
  border: 7px solid #e7bc64;
  margin: 30px auto 0;
  box-shadow: 1px 1px 24px rgba(255, 255, 255, 0.75);
}

#oit-hpa-site .win-batch {
  display: block;
  width: 38.75%;
  max-width: 465px;
}
#oit-hpa-site .champion-banner-distance {
  position: absolute;
  top: 5%;
  right: 3%;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px;
}
#oit-hpa-site .champion-banner-distance::after {
  content: '';
  display: block;
  width: 100%;
  height: 3px;
  background: linear-gradient(to right, #d2953f, #e7bc64 10%, #ffee9f 20%, #c99b4d 68%, #ab7e38 85%, #ae6d20 100%);
  position: absolute;
  bottom: -4px;
  left: 0;
}

#oit-hpa-site .distance-label {
  color: var(--ink);
  font-size: 0.75rem;
  font-weight: 800;
  line-height: 1;
  position: relative;
  display: block;
  margin: 0;
}
#oit-hpa-site .distance-label::after {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, #d2953f, #e7bc64 10%, #ffee9f 20%, #c99b4d 68%, #ab7e38 85%, #ae6d20 100%);
  transform: skewX(-17deg);
  position: absolute;
  top: 0;
  left: 0;
}
#oit-hpa-site .distance-label > span {
  position: relative;
  z-index: 1;
  display: block;
  padding: 2px 12px 4px;
}
#oit-hpa-site .distance-number {
  color: #c5900f;
  font-size: 1.5rem;
  line-height: 1;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.85);
  margin: 0;
}
#oit-hpa-site .distance-number > span {
  font-size: 50%;
}
#oit-hpa-site .distance-number .distance-unit {
  font-size: 1.2rem;
}

#oit-hpa-site .intro-grid{
  display: block;
	max-width: 80%;
}
#oit-hpa-site .intro-copy{
  /*max-width: 920px;*/
  margin: 0 auto;
  /*text-align: center;*/
}
#oit-hpa-site .intro-kicker {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-top: 24px;
  /*margin-left: -48px;*/
  color: #ccc;
  font-size: 1rem;
  line-height: 1;
  letter-spacing: .2em;
  text-transform: uppercase;
}
@media (max-width: 1200px) {
	#oit-hpa-site .intro-grid{ max-width: 90%;}
  #oit-hpa-site .intro-copy{
    text-align: center;
  }
  #oit-hpa-site .intro-kicker {
    margin-left: -48px;
  }
}
#oit-hpa-site .intro-kicker::before{ 
  width: 40px; 
  height: 1px; 
  background: #ccc; 
  content: ""; 
  display: inline-block; 
  vertical-align: middle;
  margin-right: 8px;
}
#oit-hpa-site .intro-copy h1{
  color: var(--ink);
  font-size: clamp(2.5rem, 4vw, 4rem);
  line-height: 1.2;
  white-space: nowrap;
	width: 30%;
}
#oit-hpa-site .intro-copy h1 span { display: block; }

.flexbox {
  display: flex;
  flex-direction: row;
  gap: 4%;
}
.flex-item {
  width: 48%;
}
@media (max-width: 1200px) {
  .flexbox {
    flex-direction: column;
  }
  .flex-item {
    width: 100%;
  }
}

#oit-hpa-site .intro-summary {
  max-width: 820px;
  margin: 32px auto 0;
  color: var(--text-muted);
  font-size: clamp(.92rem, 1.5vw, 1.15rem);

}
#oit-hpa-site .intro-summary span {
  display: inline-block;
}
#oit-hpa-site .intro-actions { 
  margin-top: 32px; text-align: center
}
#oit-hpa-site .intro-actions .button-primary { 
  color: var(--white); 
  background: var(--deep-blue); 
  border-color: var(--deep-blue); 
}
#oit-hpa-site .intro-actions .button-ghost { 
  color: var(--deep-blue); 
  border-color: #a8bcc8; 
}

#oit-hpa-site .photo-gallery { position: relative; background: var(--white); overflow: hidden; }
#oit-hpa-site .gallery-heading { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
#oit-hpa-site .gallery-controls {
  position: absolute;
  z-index: 5;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  padding: 3px;
  color: var(--white);
  background: var(--deep-blue);
}
#oit-hpa-site .gallery-control{
  display: grid;
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  padding: 0;
  place-items: center;
  color: var(--white);
  background: transparent;
  border: 1px solid rgba(255,255,255,.28);
  cursor: pointer;
  font: 800 .72rem/1 Roboto, sans-serif;
  transition: color .2s ease, background-color .2s ease;
}
#oit-hpa-site .gallery-control:hover, #oit-hpa-site .gallery-control:focus-visible{
  color: var(--deep-blue);
  background: var(--gold);
  outline: none;
}
#oit-hpa-site .photo-reel{ 
  width: 100%; 
  overflow: hidden; 
  touch-action: pan-y; 
  display: flex;
  flex-direction: row;
}
#oit-hpa-site .photo-track{
  display: flex;
  width: max-content;
  transform: translate3d(0,0,0);
  animation: gallery-marquee 150s linear infinite;
  will-change: transform;
}
#oit-hpa-site .photo-track.is-paused{ animation-play-state: paused; }
@keyframes gallery-marquee{
  to{ transform: translate3d(calc(-50% - 11px),0,0); }
}
#oit-hpa-site .photo-card{
  position: relative;
  flex: 0 0 clamp(320px, 28vw, 480px);
  margin: 0;
  overflow: hidden;
  background: var(--deep-blue);
}
#oit-hpa-site .photo-card img{ height: clamp(180px, 13vw, 220px); object-fit: cover; transition: transform .6s ease; }
#oit-hpa-site .hero-side-label{
  position: absolute;
  z-index: 3;
  right: 24px;
  bottom: 88px;
  margin: 0;
  opacity: .55;
  font: 600 .62rem/1 Roboto, sans-serif;
  letter-spacing: .2em;
  writing-mode: vertical-rl;
}

#oit-hpa-site section{ position: relative; }
#oit-hpa-site .project-about {
  padding: 140px 0 80px;
  color: var(--white);
  background: var(--deep-blue);
  overflow: hidden;
}
#oit-hpa-site .project-about::before {
  position: absolute;
  bottom: -0.4rem;
  left: 0;
  color: rgba(255, 255, 255, .045);
  font-size: 9vw;
  content: "Human Powered Aircraft";
  pointer-events: none;
  white-space: nowrap;
  line-height: 0.8;
  vertical-align: baseline;
  font-family: "Roboto", sans-serif !important;
  font-optical-sizing: auto;
  font-weight: 600;
  font-style: normal;
}
#oit-hpa-site .project-about::after{
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,185,220,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,185,220,.07) 1px, transparent 1px);
  background-size: 16px 64px;
  content: "";
  transform: skewX(-16deg);
}
#oit-hpa-site .project-about-grid{
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(48px, 8vw, 88px);
  align-items: start;
}
#oit-hpa-site .project-about-heading .eyebrow{ color: var(--gold); }
#oit-hpa-site .project-about-heading .section-title { color: var(--white); }
#oit-hpa-site .project-about-name {
  margin: 32px 0 0;
  color: rgba(255,255,255,.56);
  font: 600 .7rem/1.7 Roboto, sans-serif;
  letter-spacing: .16em;
  text-transform: uppercase;
}
#oit-hpa-site .project-about-copy {
  padding: 8px 0 8px 42px;
}
#oit-hpa-site .project-about-copy p { margin: 0; color: rgba(255,255,255,.74); font-size: 1rem; line-height: 2; }
#oit-hpa-site .project-about-copy p + p { margin-top: 24px; }
#oit-hpa-site .project-about-copy .project-about-lead { color: var(--white); font-size: clamp(1.08rem, 1.5vw, 1.25rem); font-weight: 800; line-height: 1.9; }
@media (max-width: 560px) {
  #oit-hpa-site .project-about::before {
    bottom: 0;
  }
}

#oit-hpa-site .about-birdman{ 
  padding-bottom: 80px; 
  background-color: var(--mist); 
}
#oit-hpa-site .about-shell{
  position: relative;
  padding: clamp(32px, 7vw, 88px);
  background: var(--white);
  box-shadow: 0 16px 64px rgba(3,42,81,.05);
  top: -32px;
}
#oit-hpa-site .about-copy .about-lead{ 
  margin: 24px 0 0; 
  color: var(--oit-blue); 
  font-size: clamp(1.15rem, 2vw, 1.45rem); 
  font-weight: 800; 
  line-height: 1.7; 
}
#oit-hpa-site .about-copy p:not(.eyebrow):not(.about-lead){ max-width: 700px; margin: 20px 0 0; color: var(--text-muted); }
#oit-hpa-site .rules-showcase {
  position: relative;
  z-index: 1;
  margin-top: 72px;
  padding: clamp(80px, 8vw, 80px) clamp(24px, 4vw, 32px) clamp(24px, 4vw, 32px);
}
#oit-hpa-site .rules-showcase::after {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  background-color: #eaf1f5;
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
}
#oit-hpa-site .rules-heading{ 
text-align: center; 
position: absolute;
top: -5%;
left: 0;
right: 0;
}
#oit-hpa-site .rules-heading h3{ 
  margin: 0; 
  color: var(--deep-blue); 
  font-size: clamp(1.7rem, 3vw, 2.8rem);
  font-weight: 600;
  line-height: 1; 
  text-transform: uppercase;
}
#oit-hpa-site .rules-heading p{ 
  margin: 8px 0 0; 
  color: var(--text-muted); 
  font-size: clamp(.8rem, 1vw, 1rem); 
  font-weight: 600; 
  letter-spacing: 0.15rem;
}
#oit-hpa-site ul.rules-list {
  margin: 0;
  padding: 0 0 0 1rem;
}
#oit-hpa-site ul.rules-list li:not(:last-child) {
  margin-bottom: 8px;
}
#oit-hpa-site .rule-ttl {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--deep-blue);
}
#oit-hpa-site .rule-ttl .marker {
  color: var(--deep-blue);
  background-color: var(--gold);
  padding: 0px 4px 2px;
}
#oit-hpa-site .rule-txt {
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-muted);
}

#oit-hpa-site .official-link{
  display: inline-flex;
  align-items: center;
  gap: 16px;
  color: #fff;
  font-size: .78rem;
  position: relative;
  margin-top: 32px;
  border: 1px solid var(--deep-blue);
  padding: 8px 16px;
  background-color: var(--deep-blue);
  transition: background ease-in-out .3s, color ease-in-out .3s;
}
#oit-hpa-site .official-link::after { color: var(--gold); content: "→"; transform: rotate(-45deg); }
/* hover */
@media (hover:hover) {
  #oit-hpa-site .official-link:hover {
    background-color: #fff;
    color: var(--deep-blue);
  }
  #oit-hpa-site .official-link:hover::after { color: var(--deep-blue); }
}

#oit-hpa-site .story{ padding: 150px 0; background: var(--white); }
#oit-hpa-site .story::before{
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 100%;
  background: var(--mist);
  content: "";
}
#oit-hpa-site .story-intro{ position: relative; display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; align-items: end; }
#oit-hpa-site .story-number{ color: var(--oit-blue); font: 800 clamp(7rem, 18vw, 15rem)/.72 Roboto, sans-serif; letter-spacing: -.09em; }
#oit-hpa-site .story-number span{ display: block; margin-top: 36px; color: var(--text-muted); font-size: .085em; letter-spacing: .15em; }
#oit-hpa-site .timeline{ position: relative; margin-top: 110px; }
#oit-hpa-site .timeline::before{ position: absolute; top: 17px; right: 0; left: 0; height: 1px; background: #cddde5; content: ""; }
#oit-hpa-site .timeline-grid{ position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
#oit-hpa-site .timeline-item{ padding-top: 52px; }
#oit-hpa-site .timeline-item::before{
  position: absolute;
  top: 10px;
  width: 15px;
  height: 15px;
  background: var(--white);
  border: 4px solid var(--cyan);
  border-radius: 50%;
  content: "";
}
#oit-hpa-site .timeline-year{ color: var(--oit-blue); font: 800 2.2rem/1 Roboto, sans-serif; }
#oit-hpa-site .timeline-item h3{ margin: 16px 0 9px; font-size: 1.02rem; }
#oit-hpa-site .timeline-item p{ margin: 0; color: var(--text-muted); font-size: .84rem; }
#oit-hpa-site .timeline-item.is-current{ padding: 32px 26px 26px; color: var(--white); background: var(--oit-blue); transform: translateY(20px); }
#oit-hpa-site .timeline-item.is-current::before{ top: -10px; margin-left: -26px; background: var(--gold); border-color: var(--gold); }
#oit-hpa-site .timeline-item.is-current .timeline-year{ color: var(--gold); }
#oit-hpa-site .timeline-item.is-current p{ color: rgba(255,255,255,.72); }

#oit-hpa-site .engineering{ padding: 150px 0; color: #f1f1f1; background: var(--ink); overflow: hidden; }
#oit-hpa-site .engineering::before{
  position: absolute;
  top: 0;
  right: -16%;
  width: 70%;
  height: 100%;
  background-image:
    linear-gradient(rgba(0,185,220,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,185,220,.08) 1px, transparent 1px);
  background-size: 16px 64px;
  content: "";
  transform: skewX(-10deg);
}
#oit-hpa-site .engineering .section-title { color: var(--white); }
#oit-hpa-site .tech-feature{
  position: relative;
  display: grid;
  grid-template-columns: 1.12fr .88fr;
  gap: 74px;
  align-items: center;
  margin-top: 90px;
}
#oit-hpa-site .tech-feature + .tech-feature{ margin-top: 140px; }
#oit-hpa-site .tech-feature.reverse{ grid-template-columns: .88fr 1.12fr; }
#oit-hpa-site .tech-feature.reverse .tech-image{ order: 2;}

#oit-hpa-site .tech-image{ position: relative; background: var(--ink); }
#oit-hpa-site .tech-image img{ aspect-ratio: 3 / 2; object-fit: cover; object-position: center; }
#oit-hpa-site .tech-image::after{ position: absolute; inset: 0; border: 1px solid rgba(255,255,255,.15); content: ""; }
#oit-hpa-site .tech-image::before{ content: ''; display: block; width: 100%; height: 100%; position: absolute; top: 0; left: 0; background: linear-gradient(160deg,rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0) 20%); z-index: 2}

#oit-hpa-site .tech-index{
  position: absolute;
  z-index: 2;
  top: -1.5rem;
  left: -1.5rem;
  color: #fff;
  font-size: 3rem;
  line-height: 1;
  letter-spacing: 0;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.25);
}
#oit-hpa-site .tech-index::after {
  content: '';
  height: 160px;
  width: 1px;
  background-color: #f1f1f1;
  transform: rotate(45deg);
  position: absolute;
  right: 10%;
  bottom: -80px;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.25);
}
@media (max-width: 560px) {
  #oit-hpa-site .tech-index {
    top: -1rem;
    left: -1rem;
    font-size: 2rem;
  }
  #oit-hpa-site .tech-index::after {
    height: 120px;
    right: 0%;
    bottom: -60px;
  }
}

#oit-hpa-site .tech-copy h3{ 
  margin: 0; 
  font-size: clamp(1.8rem, 3vw, 3rem); 
  line-height: 1.2; 
  letter-spacing: .15rem;
}
#oit-hpa-site .tech-copy p{ color: rgba(255,255,255,.65); }
#oit-hpa-site .aircraft{ padding: 150px 0; color: var(--white); background: #343b41; overflow: hidden; }
#oit-hpa-site .aircraft::before{
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 16px 16px;
  content: "";
  mask-image: linear-gradient(to bottom, transparent 6%, #000 22%, #000 58%, transparent 80%);
}
#oit-hpa-site .aircraft .container { position: relative; }
#oit-hpa-site .aircraft-head { text-align: center; }
#oit-hpa-site .aircraft-head .eyebrow{ color: var(--gold); }
#oit-hpa-site .aircraft-head .section-title { color: var(--white); }
#oit-hpa-site .aircraft-visual {
  position: relative;
  max-width: 880px;
  margin: 64px auto 0;
  padding: 32px;
  border: 1px solid rgba(255,255,255,.3);
}


.aircraft-visual #aircraft-svg .st0, 
.aircraft-visual #aircraft-svg .st1 {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 2000px; 
  opacity: 0; 
}
.aircraft-visual #aircraft-svg .st0 { stroke: #f1f1f1; }
.aircraft-visual #aircraft-svg .st1 { stroke: #f1f1f1; }
.aircraft-visual.is-visible { animation-delay: 5s; }
.aircraft-visual.is-visible #aircraft-svg .st0,
.aircraft-visual.is-visible #aircraft-svg .st1 {
  animation: svgAnm 10s linear forwards; 
  opacity: 1; 
}

/*SVGデータ差し替え
.aircraft-visual #aircraft-svg .cls-1 { 
  fill: none; 
  stroke: #fff; 
  stroke-linecap: round; 
  stroke-linejoin: round; 
  stroke-dasharray: 2000px; 
  opacity: 0; 
}
.aircraft-visual.is-visible { animation-delay: 5s; }
.aircraft-visual.is-visible #aircraft-svg-group .cls-1 { 
  animation: svgAnm 10s linear forwards; 
  opacity: 1; 
}*/
@keyframes svgAnm { 
  0% { fill: transparent; stroke-dashoffset: 2000px; }
  100% { stroke-dashoffset: 0; } 
}
#oit-hpa-site .aircraft-visual::after{ position: absolute; inset: 0; background: linear-gradient(90deg, rgba(3,42,81,.48), transparent 45%, rgba(3,42,81,.16)); content: ""; }
#oit-hpa-site .aircraft-concept{ display: grid; grid-template-columns: .62fr 1.38fr; gap: 76px; align-items: start; margin-top: 76px; }
#oit-hpa-site .aircraft-concept h3 { margin: 0; font: 800 clamp(2.1rem, 4vw, 3.8rem)/1 Roboto, sans-serif; letter-spacing: -.045em; }
#oit-hpa-site .aircraft-concept h3 small { display: block; margin-top: 14px; color: var(--gold); font-size: .22em; letter-spacing: .12em; }
#oit-hpa-site .aircraft-concept p { margin: 0; color: rgba(255,255,255,.7); }
#oit-hpa-site .aircraft-numbers { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 880px; margin: 48px auto 0; }
#oit-hpa-site .aircraft-number { padding: 0 clamp(10px, 3vw, 30px); text-align: center; border-right: 1px solid rgba(255,255,255,.5); }
#oit-hpa-site .aircraft-number:last-child { border-right: 0; }
#oit-hpa-site .aircraft-number b { 
  display: block; 
  font-size: clamp(2.3rem, 4vw, 3.8rem);
  line-height: 1;
}
#oit-hpa-site .aircraft-number .unit { 
  font-size: .44em;
  letter-spacing: .06em;
}
#oit-hpa-site .aircraft-number small{ display: block; margin-top: 12px; color: var(--gold); font-size: .7rem; font-weight: 600; letter-spacing: .1em; }
#oit-hpa-site .aircraft-specs{ 
  max-width: 880px; 
  margin: 48px auto 0; 
  padding: 40px 48px; 
  background-color: rgba(0,0,0,.25); 
}
#oit-hpa-site .aircraft-specs-ttl { 
  display: flex;
  align-items: center;
  column-gap: 16px;
  margin: 0 0 24px; 
  font-size: 1.6rem;
  line-height: 1;
  white-space: nowrap;
  color: #f1f1f1;
}
#oit-hpa-site .aircraft-specs-ttl::after {
  content: '';
  display: block;
  width: 100%;
  height: 1px;
  background-color: #f1f1f1;
}
#oit-hpa-site .fs-small { 
  font-size: .55em; 
  letter-spacing: .08em; 
}
#oit-hpa-site .aircraft-specs dl{ display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 38px; margin: 0; font-size: .78rem; }
#oit-hpa-site .spec-row{ display: grid; grid-template-columns: 126px minmax(0, 1fr); gap: 16px; align-items: baseline; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,.12); }
#oit-hpa-site .spec-row.spec-wide{ grid-column: 1 / -1; grid-template-columns: 126px minmax(0, 1fr); }
#oit-hpa-site .aircraft-specs dt{ color: #ccc; }
#oit-hpa-site .aircraft-specs dd{ min-width: 0; margin: 0; overflow-wrap: anywhere; }

#oit-hpa-site .materials {
    display: flex;
  flex-wrap: wrap;
    gap: 16px;
  }
  #oit-hpa-site .materials .material {
    display: block;
    width: 128px;
    margin: 0;
    padding: 0;
    flex-shrink: 0;
  }
#oit-hpa-site .materials .material figcaption {
  line-height: 1.5;
}
  #oit-hpa-site .materials .material-img {
    display: block;
    width: 128px;
    height: 85px;
    aspect-ratio: 3 / 2;
    background-color: #ccc;
    overflow: hidden;
    margin: 0 auto 8px;
  }
  #oit-hpa-site .materials .material-img > img {
    object-fit: cover;
  }
@media (max-width: 560px) {
  #oit-hpa-site .materials .material {
    width: 88px;
  }
  #oit-hpa-site .materials .material:not(:last-child) {
    margin-bottom: 8px;
  }
  #oit-hpa-site .materials .material-img {
    width: 80px;
    height: 60px;
  }
}

#oit-hpa-site .team{ padding: 150px 0; background: var(--mist); }
#oit-hpa-site .team-layout{ display: grid; grid-template-columns: 50% auto; gap: 48px; align-items: start; }
#oit-hpa-site .team-heading{ position: sticky; top: 72px; }
#oit-hpa-site .team-list{}
#oit-hpa-site .team-card {
  margin-bottom: 16px;
  background: var(--white);
  border-left: 4px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease;
}
#oit-hpa-site .team-card[open]{ grid-column: span 2; }
#oit-hpa-site .team-card:hover,
#oit-hpa-site .team-card[open]{ border-color: var(--cyan); box-shadow: 0 16px 38px rgba(3,42,81,.1); }
#oit-hpa-site .team-summary{
  display: grid;
  grid-template-columns: 44px 1fr 40px;
  gap: 12px;
  align-items: center;
  min-height: 108px;
  padding: 20px 18px;
  cursor: pointer;
  list-style: none;
}
#oit-hpa-site .team-summary::-webkit-details-marker{ display: none; }
#oit-hpa-site .team-summary:focus-visible{ outline: 3px solid var(--cyan); outline-offset: -3px; }
#oit-hpa-site .team-no{ color: var(--cyan); font: 800 2rem/1 Roboto, sans-serif; }
#oit-hpa-site .team-title{ display: block; color: var(--ink); font-size: 1.05rem; font-weight: 800; line-height: 1.4; }
#oit-hpa-site .team-heading small{ 
  display: block; 
  margin-top: 8px; 
  color: var(--oit-blue); 
  font-size: .65rem;
  line-height: 1.2;
  letter-spacing: .1em; 
  overflow-wrap: anywhere; 
  text-transform: uppercase;
}
#oit-hpa-site .team-toggle{
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: #b9cdd8;
  border: 1px solid #b9cdd8;
  border-radius: 50%;
  font-size: 1.65rem;
  line-height: 1;
  font-weight: 600;
  font-family: "Roboto", sans-serif;
  transition: color .25s ease, background-color .25s ease, border-color .25s ease, transform .25s ease;
}
#oit-hpa-site .team-card[open] .team-toggle{ color: var(--white); background: var(--cyan); border-color: var(--cyan); transform: rotate(45deg); }
#oit-hpa-site .team-card-content{ padding: 0 24px 28px; }
#oit-hpa-site .team-card-content-inner{
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: 22px;
  align-items: start;
  padding-top: 22px;
  border-top: 1px solid #d6e3e9;
  animation: team-open .25s ease both;
}
#oit-hpa-site .main-team-photo {
  border: 7px solid #fff;
  box-shadow: 0px 0px 1px rgba(0, 0, 0, 0.35);
  margin: 0;
  text-align: left;
  max-width: 480px;
}
#oit-hpa-site .team-photo{
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #dfe9ee;
  order: 2;
}
#oit-hpa-site .team-description{ min-width: 0; order: 1; }
#oit-hpa-site .team-card-content p{ margin: 0; color: var(--text-muted); font-size: .9rem; line-height: 1.85; }
#oit-hpa-site .team-role-list{ display: grid; gap: 8px; margin: 18px 0 0; padding-left: 1.25rem; color: var(--deep-blue); font-size: .82rem; font-weight: 800; }
#oit-hpa-site .team-role-list li::marker{ color: var(--cyan); }
@keyframes team-open{
  from{ opacity: 0; transform: translateY(-8px); }
  to{ opacity: 1; transform: translateY(0); }
}

#oit-hpa-site .lecture { 
  padding: 150px 0; 
  background: var(--oit-blue); 
  color: var(--white); 
  overflow: hidden; 
}
#oit-hpa-site .lecture::before {
  position: absolute;
  top: 50%;
  left: 62%;
  width: 660px;
  height: 660px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  content: "";
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 120px rgba(255,255,255,.035), 0 0 0 240px rgba(255,255,255,.025);
}
#oit-hpa-site .lecture-grid { 
  position: relative; 
  display: grid; 
  grid-template-columns: .75fr 1.25fr; 
  gap: 80px; 
  align-items: start; 
}
#oit-hpa-site .lecture-date { color: var(--gold); }
#oit-hpa-site .lecture-date span { 
  display: block; 
  font: 800 clamp(3.2rem, 7vw, 6.7rem)/.9 Roboto, sans-serif; 
}
#oit-hpa-site .lecture-main .lecture-title { 
  margin: 0; 
  font-size: clamp(2.2rem, 5vw, 4.8rem); 
  line-height: 1.2; 
}
#oit-hpa-site .lecture-main > p { 
  max-width: 620px; 
  margin: 28px 0 0; 
  color: rgba(255,255,255,.72); 
}
#oit-hpa-site .lecture-info { 
  display: grid; 
  grid-template-columns: repeat(2, 1fr); 
  margin-top: 48px; 
  border-top: 1px solid var(--line); 
}
#oit-hpa-site .lecture-info div { 
  padding: 24px 0; 
  border-bottom: 1px solid var(--line); 
}
#oit-hpa-site .lecture-info div:nth-child(odd) { padding-right: 24px; }
#oit-hpa-site .lecture-info div:nth-child(even) { 
  padding-left: 24px; 
  border-left: 1px solid var(--line); 
}
#oit-hpa-site .lecture-info dt { 
  color: var(--cyan); 
  font: 800 .64rem/1 Roboto, sans-serif; 
  letter-spacing: .14em; 
}
#oit-hpa-site .lecture-info dd { 
  margin: 10px 0 0; 
  font-size: .92rem; 
  font-weight: 600; 
}
#oit-hpa-site .lecture-actions { 
  display: flex; 
  align-items: center; 
  gap: 20px; 
  margin-top: 38px; 
}
#oit-hpa-site .lecture-actions small { 
  color: rgba(255,255,255,.52); 
  font-size: .7rem; 
}

#oit-hpa-site .social { padding: 80px 0; background: var(--white); }
#oit-hpa-site .social-grid{ display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: center; }
#oit-hpa-site .social-copy p{ max-width: 560px; margin: 28px 0 0; color: var(--text-muted); font-size: 1rem; }
#oit-hpa-site .social-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
#oit-hpa-site .social-card{
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 16px 24px;
  color: var(--deep-blue);
  background: var(--mist);
  border-left: 5px solid var(--cyan);
  transition: color .25s ease, background-color .25s ease, border-color .25s ease, transform .25s ease;
}
#oit-hpa-site .social-card:hover{
  color: var(--white);
  background: var(--deep-blue);
  border-color: var(--gold);
  transform: translateX(6px);
}
#oit-hpa-site .social-card:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }
#oit-hpa-site .social-mark {
  position: relative;
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  color: var(--white);
  background: var(--oit-blue);
  font: 800 1rem/1 Roboto, sans-serif;
  letter-spacing: -.03em;
  transition: color .25s ease, background-color .25s ease;
}
#oit-hpa-site .social-card:hover .social-mark { color: var(--deep-blue); background: var(--gold); }
#oit-hpa-site .social-mark--instagram::before {
  width: 28px;
  height: 28px;
  content: "";
  border: 2px solid currentColor;
  border-radius: 8px;
  background:
    radial-gradient(circle at 76% 24%, currentColor 0 1.5px, transparent 2px),
    radial-gradient(circle at 50% 50%, transparent 0 5px, currentColor 5.5px 7px, transparent 7.5px);
}
#oit-hpa-site .social-mark--youtube::before{
  width: 34px;
  height: 24px;
  content: "";
  border-radius: 7px;
  background: currentColor;
}
#oit-hpa-site .social-mark--youtube::after{
  position: absolute;
  content: "";
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 9px solid var(--oit-blue);
  transform: translateX(2px);
}
#oit-hpa-site .social-card:hover .social-mark--youtube::after{ border-left-color: var(--gold); }
#oit-hpa-site .social-mark--x::before,
#oit-hpa-site .social-mark--x::after{
  position: absolute;
  width: 32px;
  height: 3px;
  content: "";
  background: currentColor;
}
#oit-hpa-site .social-mark--x::before{ transform: rotate(52deg); }
#oit-hpa-site .social-mark--x::after{ transform: rotate(-52deg); }
#oit-hpa-site .social-name{ 
  display: block; 
  font-size: .68rem;
  font-weight: 800!important;
  line-height: 1;
  letter-spacing: .16em; 
  text-transform: uppercase;
}
#oit-hpa-site .social-handle{ display: block; margin-top: 9px; font-size: 1.2rem; font-weight: 800!important; line-height: 1.35; }
#oit-hpa-site .social-description{ display: block; margin-top: 7px; color: var(--text-muted); font-size: .78rem; }
#oit-hpa-site .social-card:hover .social-description{ color: rgba(255,255,255,.68); }
#oit-hpa-site .social-arrow{ color: var(--cyan); transform: rotate(-45deg); }
#oit-hpa-site .social-card:hover .social-arrow{ color: var(--gold); }

#oit-hpa-site .donation{ padding: 100px 0; background: var(--mist); }
#oit-hpa-site .donation-banner{
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 40px;
  padding: 40px 56px;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(3,42,81,.94), rgba(3,42,81,.58)),
    url("../img/hero-briefing.webp") center 45% / cover no-repeat;
  max-width: 880px;
  margin: 0 auto;
}
#oit-hpa-site .donation-copy {}
#oit-hpa-site .donation-copy .eyebrow { color: var(--gold); }
#oit-hpa-site .donation-copy .donation-ttl { 
  margin: 0; 
  font-size: clamp(2rem, 3.2vw, 3.2rem); 
  font-weight: 600; 
  line-height: 1; 
}
#oit-hpa-site .donation-copy p:last-child { 
  margin: clamp(10px, 2vw, 20px) 0 0; 
  font-size: clamp(0.85rem, 1vw, 1.6rem); 
  color: rgba(255,255,255,.75); 
}
#oit-hpa-site .donation-arrow {
  display: grid;
  width: clamp(48px, 6.4vw, 64px);
  height: clamp(48px, 6.4vw, 64px);
  place-items: center;
  background-color: var(--gold);
  border: 1px solid var(--gold);
  color: var(--deep-blue);
  font-size: clamp(1rem, 1.7vw, 1.7rem);
  transition: transform .35s ease;
}
#oit-hpa-site .donation-banner:hover .donation-arrow {
  transform: scale(90%);
}

#oit-hpa-site footer { 
  padding: 48px 0 24px; color: var(--white); 
  background: linear-gradient(145deg, var(--ink), var(--deep-blue)); 
}
#oit-hpa-site ul.footer-links { 
  display: grid; 
  grid-template-columns: repeat(3, minmax(0, 1fr)); 
  gap: 16px; 
  margin: 0; 
  padding: 0; 
  list-style: none; 
}
#oit-hpa-site .footer-link{
  display: block;
  max-width: 280px;
  margin: auto;
  transition: opacity ease-in-out .3s;
}
@media(hover:hover) {
  #oit-hpa-site .footer-link:hover {
    opacity: 0.5;
  }
}
#oit-hpa-site .footer-link:focus-within {
  opacity: 0.5;
}
#oit-hpa-site .footer-end { 
  display: flex; 
  align-items: end; 
  justify-content: space-between; 
  gap: clamp(16px, 3vw, 32px); 
  margin-top: clamp(16px, 3vw, 32px); 
  padding-top: clamp(16px, 2.4vw, 24px); 
  border-top: 1px solid rgba(200,200,200,.15); 
}
#oit-hpa-site .footer-brand { 
  margin: 0; 
  color: #f1f1f1;
  font-size: 1rem; 
  line-height: 1; 
  font-weight: 600; 
  letter-spacing: .08em; 
  text-transform: uppercase; 
}
#oit-hpa-site .footer-brand small { 
  display: block; 
  margin-top: 8px; 
  color: rgba(255,255,255,.48); 
  font-size: .64rem; 
  font-weight: 400; 
  letter-spacing: .15em; 
}
#oit-hpa-site .footer-notes{ max-width: 620px; color: rgba(255,255,255,.48); font-size: .68rem; text-align: right; }

#oit-hpa-site .reveal{ 
  opacity: 0; 
  transform: none; 
}
#oit-hpa-site .reveal.is-visible {
  animation: show ease-in-out 0.75s forwards;
}
@keyframes show {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0px);
  }
}

@media (max-width: 1100px) {
  #oit-hpa-site .team-list{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.sp-only { display: none; }
@media (max-width: 900px) {
  .sp-only { display: inline-block; }
  .pc-only { display: none; }
}
@media (max-width: 1200px) {
  #oit-hpa-site{ --content: min(100% - 36px, 720px); }
  #oit-hpa-site .header.sticky .gnav {
    color: var(--deep-blue);
    background: #fff;
  }
  #oit-hpa-site .gnav{ 
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    position: fixed;
    top: 0;
    left: 0;
    inset: 0;
    z-index: 10;
    color: #f1f1f1;
    background: var(--deep-blue);
    width: 100%;
    height: 100vh;
    overflow-y: auto;
    transition: all ease-in-out .3s;
  }
  #oit-hpa-site .gnav.is-open{
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  #oit-hpa-site ul.gnavs {
    height: 100%;
    width: 100%;
    flex-direction: column;
    justify-content: center;
  }
  /*#oit-hpa-site .gnav.is-open a{ font-size: 1.1rem; }*/

  #oit-hpa-site .menu-button {
    display: block;
    position: relative;
    width: 44px;
    height: 44px;
    color: #f1f1f1;
    background: transparent;
    border: 0;
    cursor: pointer;
    z-index: 15;
  }
  #oit-hpa-site .menu-button::before,
  #oit-hpa-site .menu-button::after {
    content: '';
    display: block;
    width: 32px;
    height: 2px;
    background-color: #f1f1f1;
    position: absolute;
    left: 0;
    right: 0;
    margin: auto;
    transition: transform ease-in-out .3s, top ease-in-out .3s;
  }
  #oit-hpa-site .menu-button::before {
    top: 10px;
  }
  #oit-hpa-site .menu-button::after {
    top: 20px;
  }
  #oit-hpa-site .menu-button > span {
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .03em;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
  }

  /* header - sticky */
  #oit-hpa-site .header.sticky .menu-button {
    color: var(--deep-blue);
  }
  #oit-hpa-site .header.sticky .menu-button::before,
  #oit-hpa-site .header.sticky .menu-button::after {
    background-color: var(--deep-blue);
  }

  /* menu open */
  #oit-hpa-site .menu-button.is-open::before {
    transform: rotate(25deg) translateY(-25%);
    top: 25%;
  }
  #oit-hpa-site .menu-button.is-open::after {
    transform: rotate(-25deg) translateY(-25%);
    top: 25%;
  }

  #oit-hpa-site .hero{}
  #oit-hpa-site .hero-side-label{ display: none; }
  #oit-hpa-site .slide-controls{ bottom: 22px; }
  #oit-hpa-site .hero-caption{ bottom: 24px; left: 24px; }
  #oit-hpa-site .hero-broadcast{ top: 88px; right: 16px; }
  #oit-hpa-site .lp-intro{ padding: 64px 0 80px; }
  #oit-hpa-site .champion-banner{ margin-bottom: 72px; }
  #oit-hpa-site .photo-gallery{}
  #oit-hpa-site .project-about{ padding: 100px 0; }
  #oit-hpa-site .project-about-grid{ grid-template-columns: 1fr; gap: 48px; }
  #oit-hpa-site .project-about-copy{ max-width: 100%; padding: 0; }
  #oit-hpa-site .about-birdman{ padding: 0 0 100px; }
  #oit-hpa-site .about-grid{ grid-template-columns: 1fr; gap: 54px; }
  #oit-hpa-site .rules-cards{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  #oit-hpa-site .story::before{ width: 28%; }
  #oit-hpa-site .story-intro, #oit-hpa-site .team-layout, #oit-hpa-site .lecture-grid, #oit-hpa-site .social-grid{ grid-template-columns: 1fr; gap: 32px; }
  #oit-hpa-site .aircraft-concept{ grid-template-columns: 1fr; gap: 28px; }
  #oit-hpa-site .team-heading{ position: static; }
  #oit-hpa-site .team-list{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  #oit-hpa-site .timeline-grid{ grid-template-columns: repeat(2, 1fr); row-gap: 52px; }
  #oit-hpa-site .timeline::before{ display: none; }
  #oit-hpa-site .timeline-item::before{ position: static; display: block; margin-bottom: 20px; }
  #oit-hpa-site .timeline-item.is-current{ transform: none; }
  #oit-hpa-site .timeline-item.is-current::before{ margin-left: 0; }
  #oit-hpa-site .tech-feature, #oit-hpa-site .tech-feature.reverse{ grid-template-columns: 1fr; gap: 40px; }
  #oit-hpa-site .tech-feature.reverse .tech-image{ order: 0; }
  #oit-hpa-site .donation{ padding: 80px 0; }
  #oit-hpa-site .donation-banner{ grid-template-columns: 1fr; align-items: end; gap: 24px; padding: 24px; }
  #oit-hpa-site .donation-arrow{ margin-left: auto; }
  #oit-hpa-site ul.footer-links{ grid-template-columns: repeat(2, minmax(0, 1fr)); }

  #oit-hpa-site .tech-index{
    top: 0;
    left: 0;
  }
}

@media (max-width: 560px) {
  #oit-hpa-site{ --content: calc(100% - 24px); }
  #oit-hpa-site section[id]{/* scroll-margin-top: 48px; */}
  #oit-hpa-site .header { padding: 8px 0; }
  #oit-hpa-site .brand-logo{ max-width: 144px; max-height: 32px; background-size: 144px 32px; }
  #oit-hpa-site .hero-broadcast{}
  #oit-hpa-site .hero-broadcast h2{ font-size: 1.2rem; }
  #oit-hpa-site .hero-broadcast-date strong{}
  #oit-hpa-site .hero-broadcast-date span{}
  #oit-hpa-site .hero-broadcast-network{}
  #oit-hpa-site .hero-broadcast-link{}
  #oit-hpa-site .lp-intro{ padding: 32px 0 64px; }
  #oit-hpa-site .intro-actions{ display: grid; }
  #oit-hpa-site .button{ width: 100%; }
  #oit-hpa-site .photo-card{ flex-basis: min(82vw, 360px); }
  #oit-hpa-site .photo-card img{}
  #oit-hpa-site .photo-gallery{}
  #oit-hpa-site .gallery-controls{ top: 20px; right: 16px; }
  #oit-hpa-site .gallery-control{ width: 32px; height: 32px; }
  #oit-hpa-site .project-about{ padding: 72px 0; }
  #oit-hpa-site .project-about-grid{ gap: 32px; }
  #oit-hpa-site .project-about-copy{}
  #oit-hpa-site .project-about-copy p{ font-size: .92rem; line-height: 1.9; }
  #oit-hpa-site .project-about-name{ margin-top: 22px; }
  #oit-hpa-site .about-shell{}
  #oit-hpa-site .about-grid,
  #oit-hpa-site .about-copy,
  #oit-hpa-site .rules-showcase,
  #oit-hpa-site .rules-cards,
  #oit-hpa-site .rule-card{ min-width: 0; max-width: 100%; }
  #oit-hpa-site .about-copy p,
  #oit-hpa-site .rule-card small{ overflow-wrap: anywhere; }
  #oit-hpa-site .rules-showcase{}
  #oit-hpa-site .rules-heading h3{ overflow-wrap: anywhere; }
  #oit-hpa-site .rules-cards{ grid-template-columns: 1fr; gap: 14px; margin-top: 30px; }
  #oit-hpa-site .rule-card{ min-height: 248px; padding: 28px 22px; }
  #oit-hpa-site .story-number{ font-size: 8rem; }
  #oit-hpa-site .timeline{ margin-top: 70px; }
  #oit-hpa-site .timeline-grid{ grid-template-columns: 1fr; }
  #oit-hpa-site .tech-feature + .tech-feature{ margin-top: 64px; }
  #oit-hpa-site .aircraft-visual{ margin-top: 44px; }
  #oit-hpa-site .aircraft-visual img{ height: 270px; }
  #oit-hpa-site .aircraft-concept{ margin-top: 50px; }
  #oit-hpa-site .aircraft-numbers{}
  #oit-hpa-site .aircraft-number{}
  #oit-hpa-site .aircraft-specs{ margin-top: 48px; padding: 24px; }
  #oit-hpa-site .aircraft-specs dl{ grid-template-columns: 1fr; }
  #oit-hpa-site .spec-row,
  #oit-hpa-site .spec-row.spec-wide{ grid-column: auto; gap: 4px; padding: 11px 0; }
  #oit-hpa-site .aircraft-specs dt{ color: var(--cyan); }
  #oit-hpa-site .spec-part{ display: block; }

  #oit-hpa-site .champion-banner {
    margin: 32px 0;
  }
  #oit-hpa-site .champion-banner-distance {
    flex-direction: column;
    gap: 8px;
  }
  #oit-hpa-site .distance-label {
    font-size: .8rem;
  }
  #oit-hpa-site .distance-number {
    font-size: 1.75rem;
  }

  #oit-hpa-site .aircraft { padding: 100px 0; }

  #oit-hpa-site .team-list{ grid-template-columns: 1fr; }
  #oit-hpa-site .team-card[open]{ grid-column: span 1; }
  #oit-hpa-site .team-summary{ grid-template-columns: 48px 1fr 36px; gap: 12px; min-height: 0; padding: 22px 18px; }
  #oit-hpa-site .team-no{ font-size: 1.8rem; }
  #oit-hpa-site .team-title{ font-size: 1.05rem; }
  #oit-hpa-site .team-heading small{ font-size: .58rem; letter-spacing: .08em; }
  #oit-hpa-site .team-toggle{ width: 34px; height: 34px; font-size: 1.4rem; }
  #oit-hpa-site .team-card-content{ padding: 0 18px 24px; }
  #oit-hpa-site .team-card-content-inner{ grid-template-columns: 1fr; gap: 18px; }
  #oit-hpa-site .social{}
  #oit-hpa-site .social-grid{ gap: 42px; }
  #oit-hpa-site .social-card{ min-height: 112px; grid-template-columns: 50px 1fr 20px; gap: 14px; padding: 20px 18px; }
  #oit-hpa-site .social-mark{ width: 46px; height: 46px; font-size: .82rem; }
  #oit-hpa-site .social-handle{ font-size: 1rem; overflow-wrap: anywhere; }
  #oit-hpa-site .social-description{ font-size: .7rem; }
  #oit-hpa-site .lecture-info{ grid-template-columns: 1fr; }
  #oit-hpa-site .lecture-info div:nth-child(even){ padding-left: 0; border-left: 0; }
  #oit-hpa-site .lecture-info div:nth-child(odd){ padding-right: 0; }
  #oit-hpa-site .lecture-actions{ display: grid; }
  #oit-hpa-site .donation{ padding: 56px 0; }
  #oit-hpa-site .donation-banner{}
  #oit-hpa-site footer{ padding-top: 56px; }
  #oit-hpa-site .footer-related-head{ align-items: start; flex-direction: column; }
  #oit-hpa-site .footer-related-head small{ text-align: left; }
  #oit-hpa-site ul.footer-links{ /*grid-template-columns: 1fr;*/ }
  #oit-hpa-site .footer-link{}
  #oit-hpa-site .footer-end{ align-items: start; flex-direction: column; }
  #oit-hpa-site .footer-notes{ text-align: left; }
  #oit-hpa-site .footer-brand { font-size: 0.9rem; }
}

@media (max-width: 375px) {
  #oit-hpa-site .distance-label {
    font-size: .78rem;
  }
  #oit-hpa-site .distance-number {
    font-size: 1.6rem;
  }
  #oit-hpa-site .distance-number .distance-unit {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html.oit-hpa-document{ scroll-behavior: auto; }
  #oit-hpa-site, #oit-hpa-site *, #oit-hpa-site *::before, #oit-hpa-site *::after{ animation-duration: .01ms !important; transition-duration: .01ms !important; }
  #oit-hpa-site .reveal{ opacity: 1; transform: none; }
  #oit-hpa-site .photo-track{ animation: none !important; transform: none !important; }
}

#oit-hpa-site .fc-cyan { color: var(--cyan); }

#oit-hpa-site a.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--oit-blue);
  font-size: .78rem;
  font-weight: 800;
  position: relative;
}
#oit-hpa-site a.link-btn::after {
  color: var(--cyan);
  content: "→";
  transform: rotate(0deg);
}
#oit-hpa-site a.link-btn[target="_blank"]::after {
  transform: rotate(45deg);
}

#oit-hpa-site  [lang="en"] {
  font-family: "Roboto", sans-serif!important;
  font-optical-sizing: auto;
  font-weight: 600;
  font-style: normal;
}

.clip-tb { 
  clip-path: polygon(0 88px, 100% 0, 100% calc(100% - 88px), 0% 100%); 
  margin-top: -88px; 
  margin-bottom: -88px;
  position: relative;
  z-index: 1;
}
.clip-t { 
  clip-path: polygon(0 88px, 100% 0, 100% 100%, 0% 100%); 
  margin-top: -88px; 
  position: relative;
  z-index: 1;
}
.clip-b { 
  clip-path: polygon(0 100%, 100% 0, 100% 88px, 0% 100%); 
  margin-bottom: -88px;
  position: relative;
  z-index: 1;
}
@media (max-width: 560px) {
  .clip-tb { 
    clip-path: polygon(0 48px, 100% 0, 100% calc(100% - 48px), 0% 100%); 
    margin-top: -48px; 
    margin-bottom: -48px;
  }
  .clip-t { 
    clip-path: polygon(0 48px, 100% 0, 100% 100%, 0% 100%); 
    margin-top: -48px; 
  }
  .clip-b { 
    clip-path: polygon(0 100%, 100% 0, 100% 48px, 0% 100%); 
    margin-bottom: -48px;
  }
}