:root{--navy:#0E1526;--cyan:#3DDCFF;--bg:#FFFFFF;--text:#0E1526;--muted:#324055;--line:#DDE5F0;--hint:#FFF4D6;--font:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0E1526;--text:#F4F7FB;--muted:#AAB6CA;--line:#25314D;--hint:#3A3214;color-scheme:dark}}
:root[data-theme="dark"]{--bg:#0E1526;--text:#F4F7FB;--muted:#AAB6CA;--line:#25314D;--hint:#3A3214;color-scheme:dark}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:820px;margin:0 auto;padding:0 24px}
@media (max-width:600px){.wrap{padding:0 16px}}
header{background:var(--navy);padding-top:env(safe-area-inset-top,0px)}
header .wrap{display:flex;align-items:center;justify-content:space-between;min-height:72px;max-width:1200px}
.logo{text-decoration:none;font-weight:700;font-size:1.2rem;color:#fff}
.logo b{color:var(--cyan);font-weight:700}
.back{color:#E8EEF8;text-decoration:none;font-size:.95rem}
.back:hover{color:var(--cyan)}
.hero{background:var(--navy);color:#fff;padding:40px 0 56px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(60% 90% at 90% 20%,rgba(61,220,255,.25),transparent 60%);pointer-events:none}
h1{position:relative;margin:0;font-size:clamp(2rem,5vw,3rem);font-weight:800;letter-spacing:-0.02em;line-height:1.12}
main{padding:56px 0 80px}
main h2{font-size:1.25rem;font-weight:700;margin:2.2em 0 .5em;letter-spacing:-0.01em}
main p,main ul{margin:0 0 1em}
main p,main li{color:var(--muted)}
main strong{color:var(--text)}
.hint{background:var(--hint);border-radius:12px;padding:12px 16px;font-size:.92rem}
footer{background:var(--navy);color:#B9C6DB;padding:28px 0;padding-bottom:calc(28px + env(safe-area-inset-bottom,0px));font-size:.9rem}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;max-width:1200px}
footer nav{display:flex;gap:20px;flex-wrap:wrap}
footer a{text-decoration:none}
footer a:hover{color:var(--cyan)}