/* MainField 共享样式:主题变量、基础排版、表单、按钮、提示条、页脚。
   字体由各页面先引入 /fonts/fonts.css(IBM Plex / Space Grotesk / Oswald)。 */
:root {
  --ink: #14181A; --steel: #565F5C; --paper: #EDEEE9; --surface: #FCFCFA;
  --amber: #B97B1E; --amber-ink: #7A5013; --teal: #23545E; --teal-ink: #163E46;
  --success: #3E7350; --line: #D3D2C8; --danger: #A23C2E;
  --bg: var(--paper); --card: var(--surface); --text: var(--ink);
  --text-muted: var(--steel); --border: var(--line);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181A; --card: #1C2224; --text: #EDEEE9; --text-muted: #9BA5A1; --border: #313A3B;
  }
}
:root[data-theme="dark"] {
  --bg: #14181A; --card: #1C2224; --text: #EDEEE9; --text-muted: #9BA5A1; --border: #313A3B;
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: 'IBM Plex Sans', system-ui, sans-serif; -webkit-font-smoothing: antialiased;
}
.shell { max-width: 560px; margin: 0 auto; padding: 24px 18px 40px; }

.wordmark { display: flex; align-items: baseline; gap: 10px; margin-bottom: 22px; }
.wordmark .mark { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 23px; letter-spacing: 0.2px; }
.wordmark .tag { font-size: 12.5px; color: var(--text-muted); border-left: 1px solid var(--border); padding-left: 10px; }

.panel { background: var(--card); border: 1px solid var(--border); border-radius: 3px; padding: 22px; }
h2.section-title { font-family: 'Oswald', sans-serif; font-size: 19px; font-weight: 600; margin: 0 0 4px; }
p.section-sub { margin: 0 0 20px; color: var(--text-muted); font-size: 13.5px; line-height: 1.5; }

label.field-label { display: block; font-size: 13px; font-weight: 500; color: var(--text-muted); margin-bottom: 6px; }
.field { margin-bottom: 18px; }

select, textarea, input[type=text], input[type=email], input[type=tel] {
  width: 100%; font-family: 'IBM Plex Sans', sans-serif; font-size: 16px; /* 16px:避免 iPhone 聚焦时自动放大 */
  padding: 10px 12px; border-radius: 3px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); min-height: 44px;
}
select:focus, textarea:focus, input:focus { outline: 2px solid var(--teal); outline-offset: 1px; }
input.code-input {
  font-family: 'IBM Plex Mono', monospace; font-size: 26px; letter-spacing: 0.4em;
  text-align: center; padding: 12px 8px;
}

.btn {
  font-family: 'IBM Plex Sans', sans-serif; font-size: 14.5px; font-weight: 500;
  padding: 13px 20px; border-radius: 3px; border: 1px solid transparent; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; width: 100%;
  transition: opacity 0.15s ease, transform 0.06s ease;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--ink); color: #fff; }
:root[data-theme="dark"] .btn-primary { background: var(--amber); color: #17110a; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn-primary { background: var(--amber); color: #17110a; } }
.btn-ghost { background: transparent; color: var(--text-muted); border-color: var(--border); }
.btn-ghost:hover:not(:disabled) { background: rgba(86,95,92,0.12); }
.btn-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.link-btn {
  background: none; border: 0; padding: 4px 0; color: var(--text-muted); font: inherit; font-size: 13px;
  text-decoration: underline; text-underline-offset: 2px; cursor: pointer;
}
.link-btn:hover { color: var(--text); }

.hairline-note { font-size: 12px; color: var(--text-muted); margin-top: 6px; line-height: 1.5; }
.turnstile-wrap { margin: 4px 0 14px; min-height: 0; }

.status-banner {
  display: none; align-items: flex-start; gap: 10px; padding: 14px 16px; border-radius: 3px;
  font-size: 13.5px; line-height: 1.5; margin-bottom: 18px;
}
.status-banner.show { display: flex; }
.status-banner.success { background: rgba(62,115,80,0.1); color: var(--success); border: 1px solid rgba(62,115,80,0.3); }
.status-banner.error { background: rgba(162,60,46,0.1); color: var(--danger); border: 1px solid rgba(162,60,46,0.3); }
:root[data-theme="dark"] .status-banner.success { color: #7FCB9A; }
:root[data-theme="dark"] .status-banner.error { color: #E8897C; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .status-banner.success { color: #7FCB9A; }
  :root:not([data-theme="light"]) .status-banner.error { color: #E8897C; }
}

.spinner {
  width: 15px; height: 15px; border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff; border-radius: 50%; animation: spin 0.7s linear infinite; flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }
[hidden] { display: none !important; }

.mf-legal { max-width: 560px; margin: 8px auto 40px; padding: 0 18px; text-align: center; font: 12.5px/1.6 'IBM Plex Sans', system-ui, sans-serif; }
.mf-legal a { color: inherit; opacity: .7; text-decoration: underline; text-underline-offset: 2px; }
.mf-legal a:hover { opacity: 1; }
.mf-legal span { opacity: .4; margin: 0 8px; }