:root { color-scheme: light dark; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; }
* { box-sizing: border-box; }
body { min-height: 100svh; margin: 0; display: grid; place-items: center; padding: 24px; background: #eef2f6; color: #1a2938; }
.card { width: min(100%, 430px); padding: 44px; background: #fff; border: 1px solid #dce3eb; border-radius: 20px; box-shadow: 0 20px 65px #17325214; }
.mark { display: grid; place-items: center; width: 46px; height: 46px; margin-bottom: 22px; border-radius: 12px; background: #123c57; color: #fff; font-size: 25px; }
.eyebrow { margin: 0 0 8px; color: #38617b; font-size: 11px; font-weight: 800; letter-spacing: .16em; }
h1 { margin: 0; font-size: clamp(25px, 6vw, 31px); letter-spacing: -.04em; }
.intro { margin: 10px 0 30px; color: #526679; font-size: 15px; line-height: 1.5; }
label { display: block; margin: 18px 0 7px; font-size: 14px; font-weight: 700; }
input:not([type=hidden]) { display: block; width: 100%; height: 49px; padding: 0 14px; border: 1px solid #bccbd8; border-radius: 10px; background: #fff; color: #172735; font: inherit; font-size: 16px; }
input:focus-visible, button:focus-visible { outline: 3px solid #78abdc; outline-offset: 2px; }
button { width: 100%; min-height: 49px; margin-top: 27px; border: 0; border-radius: 10px; background: #123c57; color: #fff; font: inherit; font-weight: 700; font-size: 16px; cursor: pointer; }
button:hover { background: #245c7e; }
.notice { padding: 12px 15px; border-radius: 8px; background: #fbe6e6; color: #8a2020; font-size: 14px; }
.hint { margin: 25px 0 0; color: #657688; font-size: 12px; text-align: center; }
@media (max-width: 520px) { body { padding: 16px; align-items: center; } .card { padding: 28px 23px; } }
@media (prefers-color-scheme: dark) { body { background: #0e1821; color: #edf4fa; } .card { background: #172531; border-color: #35495a; box-shadow: none; } .mark, button { background: #428eb6; color: #091622; } button:hover { background: #68abd0; } .eyebrow { color: #97c8e6; } .intro, .hint { color: #bac9d6; } input:not([type=hidden]) { background: #111c26; border-color: #6b8192; color: #fff; } .notice { background: #4d272b; color: #ffd5d5; } }