/* ============================================================
   Blue spirits media — 心が凪になる、青い場所。
   ============================================================ */
:root{
  --sky:#EAF4FB;        /* 明け方の空 */
  --shallow:#BFE0F5;    /* 浅瀬の水色 */
  --mid:#5FA8D3;        /* 中層の青 */
  --deep:#1B4965;       /* 深い青 */
  --deeper:#13405C;
  --ink:#1B4965;        /* 文字色 */
  --coral:#FF9E7D;      /* 朝焼けコーラル（差し色） */
  --white-blue:#F7FBFE; /* 青みのある白 */
  --serif:'Noto Serif JP',serif;
  --sans:'Noto Sans JP',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--white-blue);
  line-height:2;
  letter-spacing:.05em;
  font-weight:400;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;width:100%;height:auto}

/* ---------- ヒーロー ---------- */
.hero{
  position:relative;
  min-height:100svh;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
  text-align:center;
}
.hero-sky{
  position:absolute;inset:0;
  background:linear-gradient(180deg,#DCEEF9 0%,var(--sky) 45%,var(--shallow) 100%);
  animation:skyDrift 26s ease-in-out infinite alternate;
}
@keyframes skyDrift{
  from{filter:brightness(1)}
  to{filter:brightness(1.06) hue-rotate(-4deg)}
}
.hero-sea{
  position:absolute;left:-10%;right:-10%;bottom:-12%;height:52%;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(95,168,211,.55), transparent 60%),
    linear-gradient(180deg,var(--mid) 0%,var(--deep) 100%);
  border-radius:48% 52% 0 0 / 14% 18% 0 0;
  animation:seaBreath 11s ease-in-out infinite alternate;
}
@keyframes seaBreath{
  from{transform:translateY(0) rotate(.2deg)}
  to{transform:translateY(-10px) rotate(-.2deg)}
}
.hero-inner{position:relative;z-index:2;padding:0 24px}
.hero-eyebrow{
  font-size:.72rem;letter-spacing:.42em;text-indent:.42em;
  opacity:.75;margin-bottom:22px;font-weight:500;
}
.hero-title{
  font-family:var(--serif);
  font-weight:500;
  font-size:clamp(2rem,6vw,3.6rem);
  line-height:1.9;
  letter-spacing:.08em;
  text-shadow:0 2px 24px rgba(255,255,255,.55);
}
.hero-sub{
  margin-top:20px;
  font-size:clamp(.82rem,2.4vw,.98rem);
  letter-spacing:.28em;text-indent:.28em;
  opacity:.85;
}
.scroll-hint{
  position:absolute;bottom:34px;left:50%;transform:translateX(-50%);
  z-index:2;width:1px;height:56px;background:rgba(27,73,101,.35);overflow:hidden;
}
.scroll-hint span{
  position:absolute;top:-40%;left:0;width:100%;height:40%;
  background:var(--deep);
  animation:hintFlow 2.4s ease-in-out infinite;
}
@keyframes hintFlow{
  0%{top:-40%}70%,100%{top:110%}
}

/* ---------- 共通 ---------- */
.section-label{
  font-size:.72rem;letter-spacing:.4em;text-indent:.4em;
  color:var(--mid);font-weight:500;margin-bottom:36px;
}
section{padding:110px 24px}
.wrap{max-width:1080px;margin:0 auto}

/* 浮かび上がり */
.reveal{opacity:0;transform:translateY(28px);transition:opacity 1.6s ease,transform 1.6s ease}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 注目記事 ---------- */
.featured{max-width:1080px;margin:0 auto;padding-top:130px}
.featured-card{
  display:grid;grid-template-columns:1.15fr 1fr;gap:0;
  background:#fff;border-radius:20px;overflow:hidden;
  box-shadow:0 18px 50px rgba(27,73,101,.10);
  transition:box-shadow .8s ease,transform .8s ease;
}
.featured-card:hover{box-shadow:0 26px 64px rgba(27,73,101,.16);transform:translateY(-4px)}
.featured-img svg{height:100%;object-fit:cover}
.featured-body{padding:52px 46px;display:flex;flex-direction:column;justify-content:center}
.cat{
  display:inline-block;font-size:.68rem;letter-spacing:.3em;text-indent:.3em;
  color:var(--mid);border-bottom:1px solid var(--shallow);
  padding-bottom:6px;margin-bottom:18px;width:fit-content;font-weight:500;
}
.featured-body h2{
  font-family:var(--serif);font-weight:500;
  font-size:clamp(1.35rem,3vw,1.9rem);line-height:1.9;margin-bottom:16px;
}
.lead{font-size:.92rem;line-height:2.2;opacity:.85;margin-bottom:26px}
.more{
  font-size:.78rem;letter-spacing:.22em;color:var(--deep);width:fit-content;
  border-bottom:1px solid transparent;transition:border-color .5s,color .5s;
}
.featured-card:hover .more{color:var(--coral);border-color:var(--coral)}

/* ---------- 記事の流れ ---------- */
.stream{max-width:1080px;margin:0 auto}
.stream-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:64px 44px;
}
/* 川の流れ：偶数カードを下げて非対称に */
.card:nth-child(even){transform:translateY(34px)}
.card{display:block;transition:opacity 1.6s ease,transform 1.6s ease}
.card.reveal:not(.is-visible){transform:translateY(62px)}
.card.is-visible:hover{transform:translateY(-6px)}
.card:nth-child(even).is-visible:hover{transform:translateY(28px)}
.card-img{
  border-radius:16px;overflow:hidden;margin-bottom:20px;
  box-shadow:0 12px 32px rgba(27,73,101,.10);
}
.card-img svg{transition:transform 1.4s ease}
.card:hover .card-img svg{transform:scale(1.04)}
.card h3{
  font-family:var(--serif);font-weight:500;
  font-size:1.08rem;line-height:1.9;margin-bottom:6px;
  transition:color .5s;
}
.card:hover h3{color:var(--mid)}
.card p{font-size:.84rem;line-height:2;opacity:.75}

/* ---------- コンセプト ---------- */
.concept{
  text-align:center;
  background:linear-gradient(180deg,var(--white-blue) 0%,var(--sky) 100%);
  padding-top:150px;padding-bottom:150px;
}
.concept-line{
  font-family:var(--serif);font-weight:500;
  font-size:clamp(1.4rem,4vw,2.1rem);line-height:2.2;
  margin-bottom:44px;letter-spacing:.1em;
}
.concept-text{font-size:.92rem;line-height:2.6;opacity:.85}

/* ---------- フッター ---------- */
.footer{
  text-align:center;
  padding:80px 24px 56px;
  background:linear-gradient(180deg,var(--sky),var(--shallow));
}
.footer-logo{
  font-family:var(--serif);font-size:1.15rem;letter-spacing:.2em;
  margin-bottom:22px;font-weight:500;
}
.footer-nav{display:flex;gap:34px;justify-content:center;margin-bottom:30px}
.footer-nav a{
  font-size:.76rem;letter-spacing:.18em;opacity:.8;
  transition:color .5s,opacity .5s;
}
.footer-nav a:hover{color:var(--coral);opacity:1}
.copy{font-size:.68rem;letter-spacing:.14em;opacity:.6}

/* ---------- 記事ページ ---------- */
.article-page{background:var(--white-blue)}
.article{max-width:680px;margin:0 auto;padding:90px 24px 60px}
.article-eyebrow{
  font-size:.7rem;letter-spacing:.4em;text-indent:.4em;
  color:var(--mid);font-weight:500;margin-bottom:20px;
}
.article-title{
  font-family:var(--serif);font-weight:500;
  font-size:clamp(1.5rem,5vw,2.2rem);line-height:1.9;margin-bottom:14px;
}
.article-lead{font-size:.9rem;opacity:.75;margin-bottom:40px}
.article-hero{border-radius:16px;overflow:hidden;margin-bottom:48px;box-shadow:0 12px 36px rgba(27,73,101,.10)}
.article-body p{font-size:.95rem;line-height:2.4;margin-bottom:28px}
.todo-note{opacity:.55;font-size:.85rem !important;font-style:italic}
.article-nav{
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  margin-top:70px;padding-top:34px;border-top:1px solid var(--shallow);
}
.article-nav a{
  font-size:.8rem;letter-spacing:.14em;color:var(--deep);
  transition:color .5s;
}
.article-nav a:hover{color:var(--coral)}

@media (max-width:760px){
  .article{padding:64px 20px 50px}
}

/* ---------- レスポンシブ ---------- */
@media (max-width:760px){
  section{padding:76px 20px}
  .featured{padding-top:96px}
  .featured-card{grid-template-columns:1fr}
  .featured-body{padding:34px 26px}
  .stream-grid{gap:54px}
  .card:nth-child(even){transform:none}
  .card.reveal:not(.is-visible){transform:translateY(28px)}
  .card:nth-child(even).is-visible:hover{transform:translateY(-6px)}
  .sp-br{display:inline}
  .concept{padding-top:110px;padding-bottom:110px}
}
@media (min-width:761px){
  .sp-br{display:none}
}