* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; padding: 24px 16px; background: #f6f8fb; color: #202733; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif; }
.wrap { width: 100%; max-width: 640px; margin: 4vh auto; background: #fff; border: 1px solid #e7eaf0; border-radius: 12px; padding: 28px; box-shadow: 0 7px 24px rgba(0, 0, 0, .045); }
h1 { font-size: 26px; margin: 0 0 16px; }
p { line-height: 1.8; }
.intro { color: #526071; margin: 0 0 20px; }
.field-label { display: block; font-size: 16px; font-weight: 600; margin: 0 0 10px; }
.sendarea { display: block; width: 100%; font: inherit; font-size: 16px; line-height: 1.6; padding: 13px; border: 1px solid #bac5d2; border-radius: 8px; min-height: 170px; resize: vertical; }
.sendarea:focus { outline: 2px solid #245fd1; outline-offset: 1px; }
.hint { color: #697789; font-size: 13px; }
.sendbtn { display: block; width: 100%; height: 46px; margin-top: 18px; border: 0; border-radius: 8px; background: #2163c9; color: white; font: inherit; font-size: 17px; font-weight: 600; cursor: pointer; }
.sendbtn:hover { background: #154fa8; }
a { color: #1b5caf; }
.hp-field { position: absolute; left: -10000px; height: 1px; width: 1px; overflow: hidden; }
@media (max-width: 600px) { body { padding: 0; background: #fff; } .wrap { margin: 0; padding: 26px 18px; border: 0; box-shadow: none; border-radius: 0; } }