:root {
  --paper: #f7f8fa;
  --ink: #17191d;
  --muted: #717681;
  --line: #dde0e5;
  --red: #d5282f;
  --red-dark: #ad171e;
  --white: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: "Microsoft YaHei UI", "PingFang SC", sans-serif;
}

button { font: inherit; }

.shell { width: min(920px, calc(100% - 40px)); margin: 0 auto; padding: 28px 0 72px; }

header { display: flex; align-items: center; justify-content: space-between; }
.header-actions { display: flex; gap: 8px; }

.brand { display: flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 700; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--red); color: white; font-size: 18px; }

.refresh { border: 1px solid var(--line); border-radius: 9px; background: var(--white); padding: 9px 14px; color: var(--ink); cursor: pointer; }
.account-select { max-width: 160px; border: 1px solid var(--line); border-radius: 9px; background: var(--white); padding: 9px 30px 9px 12px; color: var(--ink); font: inherit; font-weight: 700; }
.refresh:hover { border-color: #b7bbc3; }
.refresh:focus-visible, .code:focus-visible { outline: 3px solid rgba(213,40,47,.22); outline-offset: 3px; }
.refresh:disabled { opacity: .55; cursor: wait; }

.hero { padding: 104px 0 96px; text-align: center; }
.status { min-height: 22px; margin: 0 0 14px; color: var(--red); font-size: 14px; font-weight: 700; }
h1 { margin: 0; font-size: clamp(24px, 3vw, 34px); letter-spacing: -.03em; }
.code { display: block; margin: 28px auto 18px; border: 0; background: transparent; color: var(--ink); font-family: "Arial Narrow", "Bahnschrift SemiCondensed", sans-serif; font-size: clamp(62px, 13vw, 122px); font-stretch: condensed; font-weight: 700; letter-spacing: .08em; line-height: .95; cursor: pointer; }
.code:disabled { color: #c3c6cc; cursor: default; }
.hint { margin: 0; color: var(--muted); font-size: 14px; }

.mail-section { border-top: 1px solid var(--line); }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; padding: 25px 0 14px; }
h2 { margin: 0; font-size: 18px; }
.section-heading time { color: var(--muted); font-size: 12px; }
.mail-list { display: grid; }
.mail { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 24px; padding: 19px 0; border-top: 1px solid var(--line); }
.mail:first-child { border-top: 0; }
.mail h3 { margin: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 15px; }
.mail time { color: var(--muted); font-size: 12px; white-space: nowrap; }
.mail p { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.mail strong { color: var(--red); }
.empty { padding: 30px 0; color: var(--muted); }
.error { color: var(--red-dark); }

dialog { width: min(460px, calc(100% - 28px)); border: 0; border-radius: 18px; padding: 0; box-shadow: 0 24px 80px rgba(24, 26, 31, .2); }
dialog::backdrop { background: rgba(28, 31, 36, .42); backdrop-filter: blur(3px); }
dialog form { padding: 28px; }
.dialog-heading { display: flex; justify-content: space-between; gap: 24px; margin-bottom: 26px; }
.dialog-heading h2 { font-size: 23px; }
.dialog-heading p { margin: 8px 0 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.close { align-self: flex-start; border: 0; background: transparent; color: var(--muted); font-size: 28px; line-height: 1; cursor: pointer; }
dialog label { display: grid; gap: 8px; margin-top: 17px; color: #42464e; font-size: 13px; font-weight: 700; }
dialog input { width: 100%; border: 1px solid var(--line); border-radius: 9px; padding: 12px 13px; background: var(--white); color: var(--ink); font: inherit; }
dialog input:focus { outline: 3px solid rgba(213,40,47,.16); border-color: var(--red); }
.save { width: 100%; border: 0; border-radius: 9px; margin-top: 8px; padding: 13px 16px; background: var(--red); color: white; font-weight: 700; cursor: pointer; }
.save:hover { background: var(--red-dark); }
.save:disabled { opacity: .6; cursor: wait; }
.form-error { min-height: 20px; margin: 12px 0 0; color: var(--red-dark); font-size: 13px; }
.privacy-note { margin: 13px 0 0; text-align: center; color: var(--muted); font-size: 12px; }

.toast { position: fixed; left: 50%; bottom: 26px; transform: translate(-50%, 18px); border-radius: 8px; background: var(--ink); color: white; padding: 10px 15px; opacity: 0; pointer-events: none; transition: .18s ease; }
.toast.show { transform: translate(-50%, 0); opacity: 1; }

@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 920px); padding-top: 18px; }
  .hero { padding: 82px 0 72px; }
  header { align-items: flex-start; }
  .header-actions { flex-wrap: wrap; justify-content: flex-end; }
  .mail { grid-template-columns: 1fr; }
  .mail time { grid-row: 3; }
  .mail p { grid-column: 1; }
}

@media (prefers-reduced-motion: reduce) { .toast { transition: none; } }