:root{
  --bg:#ffffff;
  --panel:#ffffff;
  --text:#0f1419;
  --muted:#536471;
  --line:#e6ecf0;
  --blue:#1d9bf0;
  --blue2:#1479c9;
  --blueSoft:rgba(29,155,240,.12);
  --yellow:#ffd54a;
  --pink:#ff5fa2;
  --shadow:0 10px 30px rgba(15,20,25,.08);
  --radius:18px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: "M PLUS Rounded 1c", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  color:var(--text);
  background:
    radial-gradient(1000px 700px at 20% -10%, rgba(29,155,240,.16), transparent 60%),
    radial-gradient(900px 650px at 90% 10%, rgba(29,155,240,.12), transparent 55%),
    radial-gradient(700px 520px at 40% 110%, rgba(255,95,162,.10), transparent 55%),
    linear-gradient(180deg, #ffffff 0%, #fbfdff 55%, #ffffff 100%);
}

.container{max-width:1100px;margin:0 auto;padding:0 clamp(14px, 4.5vw, 22px)}

.site-header{
  position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header{transition:transform .22s ease}
.site-header.is-hidden{transform:translateY(-110%)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 0}
.header-inner{flex-wrap:wrap}
.brand{
  display:inline-flex;align-items:baseline;gap:2px;
  font-weight:900;letter-spacing:-.02em;text-decoration:none;color:var(--text);
  font-size:20px;
}
.brand-mark{color:var(--text)}
.brand-mark2{color:var(--blue)}
.header-right{display:flex;align-items:center;gap:10px}
.link{color:var(--muted);text-decoration:none;font-weight:700}
.link:hover{color:var(--text)}

.site-footer{border-top:1px solid var(--line);margin-top:64px;padding:22px 0;color:var(--muted)}
.footer-inner{display:flex;align-items:center;justify-content:space-between}

/* Mobile bottom navigation */
.mobile-nav{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:40;
  display:none;
  transform:translateY(120%);
  transition:transform .22s ease;
  padding:12px 0 calc(12px + env(safe-area-inset-bottom));
  background:transparent;
  backdrop-filter:none;
  border-top:none;
}
.mobile-nav.is-visible{transform:translateY(0)}
.mobile-nav-inner{display:flex;justify-content:center}
.mobile-nav-btn{
  width:100%;
  max-width:520px;
  justify-content:center;
  box-shadow:
    0 16px 34px rgba(29,155,240,.32),
    0 10px 22px rgba(15,20,25,.18);
}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  gap:8px;
  border-radius:999px;
  padding:10px 14px;
  font-weight:800;
  text-decoration:none;
  border:1px solid transparent;
  transition:transform .14s ease, filter .14s ease, background-color .14s ease, border-color .14s ease, box-shadow .14s ease;
  user-select:none;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(1px) scale(.99)}
.btn-lg{padding:12px 18px;font-size:16px}
.btn-primary{
  background:linear-gradient(180deg, var(--blue) 0%, var(--blue2) 100%);
  color:#fff;
  box-shadow:0 10px 22px rgba(29,155,240,.22);
}
.btn-primary:hover{filter:brightness(1.04); box-shadow:0 14px 26px rgba(29,155,240,.26)}
.btn-ghost{
  background:rgba(255,255,255,.65);
  border-color:rgba(29,155,240,.28);
  color:var(--text);
}
.btn-ghost:hover{background:rgba(29,155,240,.08)}

.hero{display:grid;grid-template-columns:1fr;gap:18px;align-items:center;padding:clamp(18px, 3.2vw, 38px) 0 10px}

.hero-card{
  background:rgba(255,255,255,.78);
  border:1px solid rgba(29,155,240,.22);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:28px;
  position:relative;
  overflow:hidden;
}
.hero-card:before{
  content:"";
  position:absolute;inset:-40px -60px auto auto;
  width:240px;height:240px;border-radius:999px;
  background:radial-gradient(circle at 30% 30%, rgba(255,213,74,.55), rgba(255,213,74,.16) 55%, transparent 70%);
  transform:rotate(18deg);
  pointer-events:none;
}
.hero-card:after{
  content:"";
  position:absolute;inset:auto -70px -70px auto;
  width:220px;height:220px;border-radius:60px;
  background:linear-gradient(135deg, rgba(29,155,240,.22), rgba(255,95,162,.10));
  filter:blur(.2px);
  transform:rotate(-10deg);
  pointer-events:none;
}
.hero-kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-weight:900;color:var(--blue);
  letter-spacing:.14em;
  font-size:12px;
  background:rgba(29,155,240,.10);
  border:1px solid rgba(29,155,240,.20);
  padding:8px 12px;border-radius:999px;
  position:relative;
}
.hero-title{margin:12px 0 6px;font-size:clamp(40px,5.2vw,66px);line-height:1.02;letter-spacing:-.02em}
.hero-title-accent{color:var(--blue)}
.hero-tagline{margin:0;color:var(--muted);font-weight:900}
.hero-desc{margin:16px 0 0;color:var(--muted);line-height:1.75}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.hero-note{margin-top:14px;color:var(--muted);font-size:13px}

.card{
  margin-top:26px;
  background:rgba(255,255,255,.82);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:24px;
}
.card-error{border-color:rgba(244,33,46,.18)}
.h1{margin:0 0 10px;font-size:26px;letter-spacing:-.01em}
.lead{font-size:16px;line-height:1.8;color:var(--text);margin:10px 0 0}
.muted{color:var(--muted);line-height:1.7}
.small{font-size:13px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.badge{
  display:inline-flex;align-items:center;justify-content:center;
  padding:6px 10px;border-radius:999px;
  background:var(--blueSoft);color:var(--blue);
  font-weight:900;font-size:12px;
  border:1px solid rgba(29,155,240,.18);
}
code{
  font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background:rgba(29,155,240,.08);
  border:1px solid rgba(29,155,240,.12);
  padding:2px 6px;border-radius:8px;
}

/* Trending (Twitter-like) */
.tw-section{margin-top:22px}
.tw-header{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-top:18px}
.tw-title{margin:0;font-size:20px;letter-spacing:-.01em}
.tw-sub{color:var(--muted);font-weight:800;font-size:12px}
.tw-feed{
  margin-top:10px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  overflow:hidden;
}
.tw-item{
  display:grid;
  grid-template-columns:48px 1fr;
  gap:12px;
  padding:14px 14px;
  border-top:1px solid var(--line);
}
.tw-item:first-child{border-top:none}
.tw-item:hover{background:rgba(29,155,240,.04)}
.tw-avatar img{
  width:48px;height:48px;border-radius:999px;display:block;
}
.tw-avatar-fallback{
  width:48px;height:48px;border-radius:999px;
  background:linear-gradient(135deg, rgba(29,155,240,.18), rgba(29,155,240,.06));
  border:1px solid rgba(29,155,240,.14);
}
.tw-meta{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.tw-name{font-weight:900;color:var(--text)}
.tw-handle{color:var(--muted);font-weight:800}
.tw-text{
  display:block;
  margin-top:4px;
  color:var(--text);
  text-decoration:none;
  line-height:1.6;
}
.tw-text:hover{text-decoration:underline}
.tw-text-btn{
  width:100%;
  padding:0;
  border:0;
  background:transparent;
  text-align:left;
  font:inherit;
  cursor:pointer;
}
.tw-loginhint{
  margin-top:10px;
  color:var(--muted);
  font-weight:800;
  font-size:12px;
}
.tw-loginhint a{color:var(--blue);text-decoration:none}
.tw-loginhint a:hover{text-decoration:underline}
.tw-metrics{display:flex;gap:14px;flex-wrap:wrap;margin-top:10px;color:var(--muted);font-weight:800;font-size:13px}
.tw-metric{display:inline-flex;align-items:center;gap:6px}
.tw-ico{width:16px;display:inline-flex;justify-content:center;opacity:.9}
.tw-media{
  margin-top:10px;
  display:grid;
  grid-template-columns:repeat(2, minmax(0, 1fr));
  gap:8px;
}
.tw-media-a{display:block;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#f7f9f9}
.tw-media-btn{padding:0;cursor:pointer}
.tw-media-img{width:100%;height:140px;object-fit:cover;display:block}
.tw-footnote{
  display:flex;justify-content:space-between;gap:12px;
  color:var(--muted);font-size:12px;font-weight:800;
  padding:10px 2px;
}
.tw-footnote a{color:var(--blue);text-decoration:none}
.tw-footnote a:hover{text-decoration:underline}
.tw-empty,.tw-error{
  margin-top:10px;
  background:rgba(255,255,255,.82);
  border:1px solid var(--line);
  border-radius:16px;
  padding:14px;
  color:var(--muted);
  font-weight:800;
}
.tw-error{border-color:rgba(244,33,46,.18)}
.tw-locked{
  margin-top:10px;
  border:1px dashed rgba(29,155,240,.30);
  border-radius:16px;
  padding:16px;
  background:rgba(255,255,255,.7);
}
.tw-locked-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.tw-locked-title{font-weight:900}
.tw-locked-desc{color:var(--muted);font-weight:800}

/* Mobile tune */
@media (max-width: 600px){
  .site-header .container{padding-left:16px;padding-right:16px}
  .header-inner{padding:12px 0}
  .brand{font-size:18px}
  .btn{width:auto}
  .hero-card{padding:18px}
  .hero-title{font-size:clamp(38px, 11vw, 56px)}
  .hero-actions{gap:10px}
  .hero-actions .btn{width:100%}
  .card{padding:18px}
  .tw-item{grid-template-columns:44px 1fr}
  .tw-avatar img,.tw-avatar-fallback{width:44px;height:44px}
  .tw-locked-inner{align-items:flex-start}
  .tw-media-img{height:120px}
  .mobile-nav{display:block}
  /* iPhoneのセーフエリア込みで、下固定ナビがコンテンツに被らないよう余白を確保 */
  body{padding-bottom:calc(110px + env(safe-area-inset-bottom))}
}

/* Modals */
.mm-noscroll{overflow:hidden}
.mm-modal{position:fixed;inset:0;display:none;z-index:60}
.mm-modal.is-open{display:block}
.mm-backdrop{position:absolute;inset:0;background:rgba(15,20,25,.55)}
.mm-dialog{
  position:relative;
  max-width:520px;
  margin:10vh auto 0;
  background:#fff;
  border:1px solid var(--line);
  border-radius:18px;
  box-shadow:0 20px 60px rgba(15,20,25,.22);
  overflow:hidden;
}
.mm-dialog-wide{max-width:min(900px, calc(100vw - 28px))}
.mm-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line)}
.mm-title{font-weight:900}
.mm-close{
  border:0;background:transparent;cursor:pointer;
  font-size:22px;line-height:1;padding:6px 10px;border-radius:10px;
}
.mm-close:hover{background:rgba(29,155,240,.08)}
.mm-body{padding:14px 16px;color:var(--text);line-height:1.7}
.mm-actions{display:flex;gap:10px;flex-wrap:wrap;padding:0 16px 16px}
.mm-body-media{
  padding:12px;
  display:grid;
  grid-template-columns:40px 1fr 40px;
  align-items:center;
  gap:10px;
}
.mm-image{
  width:100%;
  max-height:70vh;
  object-fit:contain;
  background:#f7f9f9;
  border:1px solid var(--line);
  border-radius:14px;
}
.mm-nav{
  width:44px;height:44px;border-radius:999px;
  border:1px solid rgba(20,121,201,.55);
  background:rgba(29,155,240,.22);
  cursor:pointer;
  font-size:28px;
  color:#0b4f86;
  box-shadow:0 10px 22px rgba(15,20,25,.16);
  display:flex;align-items:center;justify-content:center;
}
.mm-nav:hover{
  background:rgba(29,155,240,.32);
  border-color:rgba(20,121,201,.75);
  box-shadow:0 14px 30px rgba(15,20,25,.18);
}
.mm-nav:disabled{opacity:.35;cursor:not-allowed}
.mm-foot{padding:0 16px 16px;color:var(--muted);font-weight:800;font-size:12px}
.mm-counter{text-align:center}

@media (max-width: 600px){
  .mm-dialog{margin:8vh auto 0;max-width:calc(100vw - 22px)}
  .mm-body-media{grid-template-columns:36px 1fr 36px}
  .mm-nav{width:40px;height:40px;font-size:26px}
}