@import url("https://fonts.googleapis.com/css2?family=Dela+Gothic+One&family=Zen+Kaku+Gothic+New:wght@400;500;700;900&display=swap");
:root{
  --ink:#0E2E6E;--blue:#1C5BE0;--cyan:#29B6F2;--yellow:#FFD83D;--red:#EE4136;
  --paper:#F2F7FF;--grid:#D6E4FA;--white:#FFFFFF;--muted:#4A5F86;
  --display:"Dela Gothic One",system-ui,sans-serif;--body:"Zen Kaku Gothic New",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--body);font-weight:500;color:var(--ink);line-height:1.95;-webkit-text-size-adjust:100%;
  background-color:var(--paper);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:24px 24px}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue)}
:focus-visible{outline:3px solid var(--red);outline-offset:3px;border-radius:6px}
.wrap{max-width:820px;margin:0 auto;padding:0 20px}

header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:2px solid var(--ink)}
header .wrap{max-width:1120px;display:flex;align-items:center;justify-content:space-between;height:60px;position:relative}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--display);font-size:17px}
.logo span{font-size:0;width:34px;height:34px;display:inline-block;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'%3E%3Cg fill='none' stroke='%230E2E6E' stroke-width='3' stroke-linecap='round'%3E%3Cellipse cx='13' cy='15' rx='10' ry='3.5'/%3E%3Cellipse cx='51' cy='15' rx='10' ry='3.5'/%3E%3Cpath d='M13 15v6M51 15v6M13 21l11 9M51 21l-11 9'/%3E%3Crect x='22' y='27' width='20' height='13' rx='5' fill='%23fff'/%3E%3Cpath d='M27 40l-4 7M37 40l4 7'/%3E%3C/g%3E%3Ccircle cx='32' cy='33.5' r='2.6' fill='%231C5BE0'/%3E%3C/svg%3E") center/contain no-repeat}
.menu-btn{width:46px;height:46px;border:2px solid var(--ink);border-radius:14px;background:var(--yellow);display:grid;place-content:center;gap:5px;cursor:pointer;box-shadow:3px 3px 0 var(--ink)}
.menu-btn span{display:block;width:20px;height:3px;border-radius:2px;background:var(--ink);transition:transform .25s,opacity .2s}
.menu-btn[aria-expanded=true] span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.menu-btn[aria-expanded=true] span:nth-child(2){opacity:0}
.menu-btn[aria-expanded=true] span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
.gnav{position:absolute;top:68px;right:20px;width:min(300px,calc(100vw - 40px));background:var(--white);border:2px solid var(--ink);border-radius:20px;box-shadow:6px 6px 0 var(--ink);padding:10px;display:none}
.gnav.open{display:block}
.gnav a{display:block;padding:12px 14px;border-radius:12px;font-weight:700;text-decoration:none;color:var(--ink)}
.gnav a:hover{background:var(--paper)}
.gnav a.cta{background:var(--yellow);text-align:center;margin-top:6px;border:2px solid var(--ink)}

.crumb{font-size:13px;color:var(--muted);padding:16px 20px 0;font-weight:700}
.crumb a{color:var(--muted)}
.hero-sub{padding:22px 0 8px}
.hero-sub small{display:inline-block;font-size:0}
.hero-sub small::after{content:"ドローン博士のコラム";font-size:14px;font-weight:900;color:var(--red);border-bottom:2px dashed var(--red)}
.hero-sub h1{font-family:var(--display);font-weight:400;font-size:clamp(26px,5.4vw,40px);line-height:1.38;margin-top:12px}
.hero-sub .date{font-size:14px;color:var(--muted);margin-top:10px;font-weight:700}

article{background:var(--white);border:2px solid var(--ink);border-radius:28px;padding:28px 22px;margin:20px auto 28px;box-shadow:8px 8px 0 var(--ink);font-size:16.5px}
@media(min-width:760px){article{padding:48px 56px}}
article .lead{font-size:17px;font-weight:700;background:var(--paper);border-radius:16px;padding:16px 18px;border-left:6px solid var(--yellow)}
article h2{font-family:var(--display);font-weight:400;font-size:clamp(21px,3.8vw,26px);line-height:1.45;margin:44px 0 14px;padding-bottom:10px;border-bottom:3px dashed var(--grid)}
article h3{font-size:18px;font-weight:900;margin:26px 0 6px;padding-left:12px;border-left:5px solid var(--blue)}
article p{margin:12px 0}
article b{font-weight:900}
article ul.check{list-style:none;margin:16px 0;display:grid;gap:8px}
article ul.check li{padding-left:32px;position:relative;font-weight:700}
article ul.check li::before{content:"";position:absolute;left:0;top:.35em;width:22px;height:22px;border-radius:50%;background:var(--yellow) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M7 12.3l3 3 6-6.3' fill='none' stroke='%230E2E6E' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/18px no-repeat;border:2px solid var(--ink)}
article img{border-radius:16px;margin:18px 0;border:2px solid var(--ink)}

.cta{background:var(--yellow);border:2px solid var(--ink);border-radius:28px;padding:32px 22px;text-align:center;margin:28px 0;box-shadow:8px 8px 0 var(--ink)}
.cta h2{font-family:var(--display);font-weight:400;font-size:clamp(22px,4.4vw,28px);line-height:1.4}
.cta p{margin-top:8px;font-weight:700}
.cta .btn{display:inline-block;margin-top:16px;background:var(--white);color:var(--ink);font-weight:900;text-decoration:none;padding:15px 28px;border-radius:16px;border:2px solid var(--ink);box-shadow:4px 4px 0 var(--ink)}
.cta .btn:active{transform:translate(3px,3px);box-shadow:1px 1px 0 var(--ink)}

.sec-title{font-family:var(--display);font-weight:400;font-size:22px;margin-top:36px}
.links{display:grid;gap:12px;margin:16px 0 48px}
.links a{display:block;background:var(--white);border:2px solid var(--ink);border-radius:18px;padding:18px 20px;text-decoration:none;color:var(--ink);font-weight:900;line-height:1.6;transition:transform .15s,box-shadow .15s}
.links a:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--ink)}
.links a small{display:block;font-weight:500;color:var(--muted);font-size:14px;margin-top:4px}

footer{background:var(--ink);color:#BFD0F2;font-size:13px;text-align:center;padding:36px 20px}
footer a{color:#fff}
footer p:first-child{font-family:var(--display);color:#fff;font-size:18px}