:root{
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #64748b;
  --line: #e5e7eb;
  --accent: #2563eb;
  --accent-600: #2563eb;
  --accent-700: #1d4ed8;
  --surface: #ffffff;
  --shadow: 0 10px 25px rgba(2, 6, 23, 0.07);
  --radius: 16px;
  --radius-sm: 12px;
  --radius-lg: 20px;
  --container: 1100px;
}
*,*::before,*::after{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans JP", "Apple Color Emoji", "Segoe UI Emoji";
  line-height:1.6; color:var(--fg); background:var(--bg);
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
a{color:inherit; text-decoration:none}
img{max-width:100%; display:block}
.container{max-width: var(--container); margin-inline:auto; padding: 0 20px}
header{position: sticky; top:0; z-index:40; background: rgba(255,255,255,0.9); backdrop-filter: saturate(180%) blur(10px); border-bottom:1px solid var(--line)}
.nav{display:flex; align-items:center; justify-content:space-between; height:64px}
.brand{display:flex; align-items:center; gap:12px; font-weight:700}
.brand .logo{width:36px; height:36px; display:grid; place-items:center; border-radius:10px; background: var(--accent); color:#fff; font-weight:800; letter-spacing:0.5px; box-shadow: 0 6px 16px rgba(37,99,235,.35)}
.menu{display:flex; gap:20px; align-items:center}
.menu a{color:var(--muted)}

.cta{display:inline-flex; align-items:center; gap:10px; font-weight:600; padding:10px 14px; border-radius:12px; border:1px solid var(--accent);
  color:#fff; background:linear-gradient(180deg, var(--accent-600), var(--accent-700)); box-shadow: 0 10px 20px rgba(37,99,235,.25)}
.cta:hover{filter:brightness(1.05)}
.burger{display:none; background:none; border:0; width:40px; height:40px}
.burger span{display:block; height:2px; background:var(--fg); margin:7px 6px}
@media (max-width: 860px){
  .menu{display:none}
  .burger{display:block}
  .menu.open{position:absolute; inset:64px 0 auto 0; background:#fff; border-bottom:1px solid var(--line); display:flex; flex-direction:column; padding:16px 20px; gap:12px}
  .menu.open .cta{width:fit-content}
}
.hero{padding: clamp(48px, 8vw, 96px) 0}
.hero .lead{color:var(--muted); max-width: 720px}
.badge{display:inline-flex; align-items:center; gap:8px; font-weight:600; font-size:12px; letter-spacing:.08em; text-transform:uppercase; color:var(--accent-700);
  background: rgba(37, 99, 235, .08); border:1px solid rgba(37,99,235,.4); padding:8px 10px; border-radius:999px}
.hero h1{font-size: clamp(28px, 4.5vw, 44px); line-height:1.15; margin:18px 0}
.hero .actions{display:flex; gap:12px; flex-wrap:wrap; margin-top:22px}
.btn{display:inline-flex; align-items:center; gap:10px; font-weight:600; padding:12px 16px; border-radius:12px}
.btn.primary{background: var(--accent); color:#fff; box-shadow: 0 10px 20px rgba(37,99,235,.25)}
.btn.primary:hover{filter:brightness(1.05)}
.btn.ghost{border:1px solid var(--line); color:var(--fg); background:#fff}
.section{padding: clamp(40px, 7vw, 80px) 0; border-top:1px solid var(--line)}
.grid{display:grid; gap:20px}
@media (min-width: 840px){.grid.cols-3{grid-template-columns: repeat(3, 1fr)}}
.card{background:var(--surface); border:1px solid var(--line); border-radius: var(--radius); padding:22px; box-shadow: var(--shadow)}
.card h3{margin:8px 0 6px}
.kicker{font-size:12px; font-weight:700; color:var(--accent-700); letter-spacing:.06em; text-transform:uppercase}
.muted{color:var(--muted)}
.callout{display:flex; flex-direction:column; gap:14px; align-items:flex-start; background:linear-gradient(180deg, rgba(37,99,235,.06), rgba(37,99,235,0)); border:1px solid rgba(37,99,235,.25);
  border-radius: var(--radius-lg); padding: clamp(20px, 4vw, 28px); box-shadow: 0 14px 30px rgba(37,99,235,.12)}
footer{border-top:1px solid var(--line); padding: 22px 0; color:var(--muted)}
@media (prefers-reduced-motion: no-preference){
  .fade-up{opacity:0; transform: translateY(8px); animation:fadeup .6s ease both}
  .fade-up.d2{animation-delay:.06s}
  .fade-up.d3{animation-delay:.12s}
  .fade-up.d4{animation-delay:.18s}
  @keyframes fadeup{to{opacity:1; transform:none}}
}

/* Active menu highlight */
.menu a.active {
  color: #007bff;
  font-weight: 600;
  border-bottom: 2px solid #007bff;
}



/* Reset leftover login button styles */


/* Active link underline */
.menu a.active {
  color: #007bff;
  font-weight: 600;
  border-bottom: 2px solid #007bff;
}

/* Reset leftover login button styles (final) */
.menu a.login-btn {
  all: unset;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}
.menu a.login-btn:hover { all: unset; color: inherit; }

/* ============================
   Modern page title styling (adjusted smaller)
   ============================ */
h1 {
  font-family: 'Poppins', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  font-size: 1.5rem;          /* smaller than before */
  font-weight: 500;
  letter-spacing: 0.05em;
  color: #222;
  border-bottom: none !important;
  display: inline-block;
  padding-bottom: 0 !important;
  margin-bottom: 16px;
}

/* ============================
   Section heading styling (small bold blue underline)
   ============================ */
h2 {
  font-family: 'Poppins', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  font-size: 1rem;              /* smaller */
  font-weight: 700;             /* bold */
  letter-spacing: 0.02em;
  color: #1e3a8a;               /* dark blue tone */
  border-bottom: 3px solid #3b82f6; /* strong blue underline */
  padding: 6px 0;
  margin-top: 24px;
  margin-bottom: 12px;
}

/* ============================
   Responsive Navigation
   ============================ */
.burger { display: none; background: none; border: none; }
.burger span { display:block; width:24px; height:2px; margin:5px 0; background:#111; transition: transform 200ms, opacity 200ms; }

/* Desktop menu */
.menu { display: flex; gap: 16px; align-items: center; }

/* Mobile layout */
@media (max-width: 768px) {
  .burger { display: inline-block; }
  .menu {
    position: absolute;
    top: 64px; /* below header */
    right: 16px;
    left: 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    display: none;
    flex-direction: column;
    padding: 12px;
    z-index: 50;
  }
  .menu.open { display: flex; }
  .menu a { display: block; padding: 10px 12px; width: 100%; border-radius: 8px; }
  
  header .container.nav { position: relative; }
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  .burger span { transition: none; }
}

/* ============================
   v5 override: center footer, no hamburger, menu always visible
   ============================ */

/* Footer center alignment */
footer.container { text-align: center; }
footer.container small { display: inline-block; }

/* Ensure desktop default */
header .menu { display: flex; gap: 16px; align-items: center; }

/* On narrow screens: hide burger, keep menu visible (no dropdown) */
@media (max-width: 860px) {
  .burger { display: none !important; }
  header { position: static !important; }              /* avoid overlay */
  header .container.nav { height: auto; padding: 10px 0; flex-wrap: wrap; }
  header .menu {
    display: flex !important;
    position: static !important;
    flex-wrap: wrap;
    gap: 10px;
    width: 100%;
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    inset: auto !important;
  }
  header .menu a { font-size: 0.92rem; padding: 6px 8px; border-radius: 8px; }
  main.container, main { padding-top: 10px !important; } /* small cushion under header */
}

/* hard-hide any leftover burger hooks */
.burger{display:none !important}

/* ============================
   v5.1: Add horizontal margin for main content
   ============================ */
main.container, main {
  margin-left: 16px;
  margin-right: 16px;
}
@media (max-width: 600px) {
  main.container, main {
    margin-left: 10px;
    margin-right: 10px;
  }
}


/* ============================
   Unified link hover styling (final)
   ============================ */

/* 通常状態 */
a {
  color: var(--fg);
  text-decoration: none;
  transition: color 0.25s ease, text-decoration 0.25s ease;
}

/* ホバー時（本文／メニュー／フッターすべて） */
a:hover,
header .menu a:hover,
footer a:hover {
  color: var(--accent) !important;      /* 例: #2563eb */
  text-decoration: underline !important;
}

/* メニュー通常色を維持 */
header .menu a {
  color: var(--fg);
}

/* アクティブメニューは強調表示 */
header .menu a.active {
  color: var(--accent);
  font-weight: 600;
  border-bottom: 2px solid var(--accent);
}

/* ============================
   Link hover (cachebust final)
   ============================ */
a:link, a:visited {
  color: var(--fg);
  text-decoration: none;
  transition: color 0.25s ease, text-decoration 0.25s ease;
}

a:hover, a:focus-visible {
  color: var(--accent) !important;
  text-decoration: underline !important;
}

header .menu a:hover,
header .menu a:focus-visible {
  color: var(--accent) !important;
  text-decoration: underline !important;
}

footer a:hover, footer a:focus-visible {
  color: var(--accent) !important;
  text-decoration: underline !important;
}


/* ===== main中央寄せ（最終・安定版） ===== */
main.container {
  width: 98%;
  max-width: 980px;    /* コンテンツ幅を固定 */
  margin: 0 auto;      /* 左右中央寄せ */
  padding: 24px 20px;  /* 余白 */
}
/* 画面幅が 1000px 以上のとき（主にPC）は固定980pxで表示 */
@media (min-width: 1000px) {
  main.container {
    width: 980px;      /* 固定幅 */
  }
}

/* ===== トップ画像（高さを画面の50%に） ===== */
.top-image {
  width: 100%;
  height: 20vh;             /* 高さを画面の20%に設定 */
  overflow: hidden;         /* はみ出た部分を隠す */
  margin: 0;
  padding: 0;
}

.top-image img {
  width: 100%;
  height: 100%;             /* コンテナに合わせる */
  object-fit: cover;        /* トリミングして自然に収まる */
  display: block;
}