:root{--paper: #ffffff;--mist: #f2f7fa;--ink: #14232e;--ink-soft: #4a5d6b;--seto: #0f6fa8;--seto-deep: #0a4a73;--line: #d6e2ea;--demo-bg: #fff3dc;--demo-ink: #7a4300;--nav-h: 64px;--font: "Zen Kaku Gothic New", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;color-scheme:light}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:18px;line-height:1.8;line-break:strict;word-break:auto-phrase;padding-bottom:calc(var(--nav-h) + env(safe-area-inset-bottom,0px) + 16px)}a{color:var(--seto-deep)}:focus-visible{outline:3px solid var(--seto);outline-offset:3px;border-radius:4px}.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:8px 14px;z-index:50}.skip:focus{left:8px;top:8px}.wrap{width:100%;max-width:640px;margin:0 auto;padding:0 20px}.top{border-bottom:1px solid var(--line);background:var(--paper)}.top .wrap{display:flex;align-items:center;justify-content:space-between;min-height:56px;gap:12px}.brand{font-weight:700;font-size:17px;color:var(--ink);text-decoration:none}.lang{font:inherit;font-size:16px;font-weight:700;color:var(--seto-deep);background:var(--mist);border:1px solid var(--line);border-radius:999px;padding:6px 16px;text-decoration:none;min-height:40px;display:inline-flex;align-items:center}.notice{background:var(--demo-bg);color:var(--demo-ink);font-size:14px;line-height:1.5;padding:8px 0}.notice b{font-weight:700;margin-right:8px;border:1px solid currentColor;border-radius:4px;padding:0 6px}.hero{position:relative;overflow:hidden;background:var(--seto-deep);color:#fff}.hero svg{position:absolute;inset:0;width:100%;height:100%}.hero .wrap{position:relative;padding-top:40px;padding-bottom:36px}.hero h1{margin:0 0 4px;font-size:30px;line-height:1.35;font-weight:700}.hero p{margin:0;color:#d6ecf8}.times{display:flex;gap:28px;margin-top:28px}.time dt{font-size:14px;color:#bfe0f3}.time dd{margin:0;font-size:44px;line-height:1.1;font-weight:700;font-variant-numeric:tabular-nums}main h1.page{font-size:26px;line-height:1.4;margin:28px 0 8px}main h2{font-size:21px;line-height:1.5;margin:36px 0 10px;padding-left:12px;border-left:4px solid var(--seto)}main p{margin:0 0 14px;max-width:34em}.lead{color:var(--ink-soft)}.menu{list-style:none;margin:24px 0 0;padding:0}.menu li+li{border-top:1px solid var(--line)}.menu a{display:flex;align-items:center;justify-content:space-between;min-height:64px;color:var(--ink);text-decoration:none;font-weight:700;font-size:19px}.menu a:after{content:"";width:10px;height:10px;border-right:3px solid var(--seto);border-top:3px solid var(--seto);transform:rotate(45deg);margin-right:4px}ol.steps{padding-left:1.4em;margin:0 0 14px}ol.steps li{margin-bottom:8px;padding-left:4px}ul.rules{padding-left:1.2em;margin:0 0 14px}ul.rules li{margin-bottom:8px}.panel{background:var(--mist);border-radius:12px;padding:16px 18px;margin:0 0 14px}.panel dl{margin:0}.panel dt{font-size:14px;color:var(--ink-soft)}.panel dd{margin:0 0 10px;font-size:22px;font-weight:700;font-variant-numeric:tabular-nums;word-break:break-all}.panel dd:last-child{margin-bottom:0}.row{display:flex;align-items:center;justify-content:space-between;gap:12px}button.copy{font:inherit;font-size:15px;font-weight:700;min-height:44px;padding:0 16px;border-radius:8px;border:1px solid var(--seto);background:var(--paper);color:var(--seto-deep);cursor:pointer}button.copy[data-done=true]{background:var(--seto);color:#fff}.place{padding:16px 0;border-top:1px solid var(--line)}.place:first-of-type{border-top:0}.place h2{margin:0 0 6px;padding:0;border:0;font-size:20px}.btn{display:inline-flex;align-items:center;min-height:48px;padding:0 20px;border-radius:8px;background:var(--seto);color:#fff;font-weight:700;text-decoration:none;font-size:17px}.btn.ghost{background:var(--paper);color:var(--seto-deep);border:1px solid var(--seto)}details{border-top:1px solid var(--line)}details:last-of-type{border-bottom:1px solid var(--line)}summary{cursor:pointer;min-height:60px;display:flex;align-items:center;font-weight:700;list-style:none;padding:6px 0}summary::-webkit-details-marker{display:none}summary:after{content:"+";margin-left:auto;font-size:26px;color:var(--seto)}details[open] summary:after{content:"−"}details p{margin:0 0 16px}.urgent{border:2px solid #b3261e;border-radius:12px;padding:16px 18px;margin:20px 0}.urgent h2{margin:0 0 6px;padding:0;border:0;color:#b3261e;font-size:20px}.urgent p:last-child{margin-bottom:0}.nav{position:fixed;left:0;right:0;bottom:0;background:var(--paper);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom,0px);z-index:20}.nav ul{display:grid;grid-template-columns:repeat(4,1fr);list-style:none;margin:0 auto;padding:0;max-width:640px}.nav a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:var(--nav-h);color:var(--ink-soft);text-decoration:none;font-size:13px;font-weight:700;line-height:1.3}.nav a svg{width:24px;height:24px}.nav a[aria-current=page]{color:var(--seto-deep);box-shadow:inset 0 3px 0 var(--seto)}@media(min-width:700px){body{font-size:19px}.hero h1{font-size:36px}}@media(prefers-reduced-motion:no-preference){.hero .river path{stroke-dasharray:1400;stroke-dashoffset:1400;animation:flow 2.4s ease-out forwards}@keyframes flow{to{stroke-dashoffset:0}}}