:root {
  --ink: #14231e;
  --muted: #63706b;
  --green: #174f3b;
  --green-2: #267255;
  --cream: #f3f0e7;
  --line: #d9ddd7;
  --white: #fff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fafaf7;
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
}
a { color: inherit; }

.site-header {
  height: 86px;
  padding: 0 clamp(22px, 5vw, 76px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 13px; text-decoration: none; }
.brand-mark {
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center;
  color: white; background: var(--green);
  font-family: Georgia, serif; font-size: 24px;
}
.brand b, .brand small { display: block; }
.brand b { font-size: 16px; letter-spacing: .08em; }
.brand small { margin-top: 2px; color: var(--muted); font-size: 10px; letter-spacing: .13em; }
.official-logo {
  display: block;
  width: clamp(150px, 19vw, 220px);
  line-height: 0;
}
.official-logo img {
  display: block;
  width: 100%;
  height: auto;
}

.hero {
  position: relative;
  min-height: 390px;
  padding: 92px clamp(22px, 8vw, 130px);
  overflow: hidden;
  color: white;
  background:
    radial-gradient(circle at 80% 10%, rgba(255,255,255,.13), transparent 28%),
    linear-gradient(120deg, #0e392c, #1d684c);
}
.hero::after {
  content: ""; position: absolute; right: -6vw; bottom: -170px;
  width: 500px; height: 500px; border: 1px solid rgba(255,255,255,.18); border-radius: 50%;
  box-shadow: 0 0 0 70px rgba(255,255,255,.035), 0 0 0 140px rgba(255,255,255,.025);
}
.eyebrow { margin: 0 0 15px; color: #b9d9ca; font: 700 12px/1.4 Arial, sans-serif; letter-spacing: .24em; }
h1 { margin: 0; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(42px, 6vw, 72px); font-weight: 500; letter-spacing: .08em; }
.lead { margin: 26px 0 0; line-height: 2; font-size: 15px; letter-spacing: .06em; opacity: .86; }

.archive { max-width: 1160px; margin: auto; padding: 90px 24px 110px; }
.archive-heading { display: flex; align-items: end; justify-content: space-between; margin-bottom: 32px; }
.archive-heading h2 { margin: 0; font: 500 clamp(27px, 4vw, 40px) "Yu Mincho", serif; letter-spacing: .08em; }
.archive-heading > p { margin: 0 0 4px; color: var(--muted); font-size: 13px; }
.archive-heading > p span { color: var(--green); font: 700 22px Georgia, serif; }
.controls { display: grid; grid-template-columns: 1fr 170px; gap: 12px; margin-bottom: 42px; }
.search { display: flex; align-items: center; gap: 10px; padding: 0 18px; background: white; border: 1px solid var(--line); }
.search span { color: var(--green); font-size: 24px; }
input, select { min-height: 52px; border: 1px solid var(--line); background: white; color: var(--ink); font: inherit; }
input { width: 100%; border: 0; outline: 0; }
select { padding: 0 15px; }

.video-list { border-top: 1px solid var(--line); }
.video-card {
  display: grid; grid-template-columns: 320px 1fr; gap: clamp(25px, 5vw, 68px);
  padding: 34px 0; border-bottom: 1px solid var(--line);
}
.thumb {
  position: relative; display: block; overflow: hidden; aspect-ratio: 16/9;
  background: #dfe5e0;
}
.thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.video-card:hover .thumb img { transform: scale(1.035); }
.play {
  position: absolute; inset: 50% auto auto 50%; translate: -50% -50%;
  width: 54px; height: 54px; border-radius: 50%; display: grid; place-items: center;
  color: white; background: rgba(17,66,49,.92); box-shadow: 0 6px 24px rgba(0,0,0,.2);
}
.play::after { content: ""; margin-left: 4px; border: 8px solid transparent; border-left: 13px solid white; }
.duration { position: absolute; right: 8px; bottom: 8px; padding: 3px 6px; color: white; background: rgba(0,0,0,.78); font-size: 11px; }
.video-copy { align-self: center; }
.meta { margin: 0 0 13px; color: var(--green-2); font-size: 12px; font-weight: 700; letter-spacing: .05em; }
.video-copy h3 { margin: 0; font-size: clamp(17px, 2vw, 23px); line-height: 1.55; letter-spacing: .035em; }
.video-copy h3 a { text-decoration: none; }
.video-copy h3 a:hover { color: var(--green-2); }
.description-wrap { margin-top: 16px; }
.description {
  margin: 0;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.9;
  white-space: pre-line;
}
.description.is-expanded {
  display: block;
  overflow: visible;
}
.description-toggle {
  margin-top: 8px;
  padding: 0 0 3px;
  color: var(--green-2);
  background: transparent;
  border: 0;
  border-bottom: 1px solid currentColor;
  font: 700 12px inherit;
  letter-spacing: .04em;
  cursor: pointer;
}
.description-toggle:hover { color: var(--ink); }
.description-toggle:focus-visible {
  outline: 2px solid var(--green-2);
  outline-offset: 4px;
}
.watch { display: inline-block; margin-top: 21px; color: var(--muted); font-size: 12px; font-weight: 700; text-decoration: none; letter-spacing: .09em; }
.watch::after { content: " →"; color: var(--green); }
.load-more {
  display: block; width: min(100%, 360px); margin: 56px auto 0; padding: 18px;
  color: white; background: var(--green); border: 0; font: 700 14px inherit; letter-spacing: .1em; cursor: pointer;
}
.load-more:hover { background: var(--green-2); }
.empty { padding: 70px 20px; text-align: center; }
.empty button { padding: 10px 16px; border: 1px solid var(--green); color: var(--green); background: transparent; cursor: pointer; }
footer {
  display: flex; justify-content: space-between; align-items: end; gap: 20px;
  padding: 62px clamp(22px, 7vw, 110px); color: rgba(255,255,255,.72); background: #102b22; font-size: 12px;
}
.footer-title { margin: 0 0 10px; color: white; font: 500 20px "Yu Mincho", serif; }
footer a { color: white; text-decoration: none; }

@media (max-width: 720px) {
  .site-header { height: 72px; }
  .official-logo { width: 138px; }
  .brand-mark { width: 38px; height: 38px; }
  .brand small { display: none; }
  .hero { min-height: 345px; padding-top: 70px; }
  .controls { grid-template-columns: 1fr; }
  .video-card { grid-template-columns: 1fr; gap: 18px; padding: 28px 0; }
  .video-copy h3 { font-size: 18px; }
  footer { align-items: start; flex-direction: column; }
}