:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --text: #172033;
  --muted: #778197;
  --muted-2: #9ba4b5;
  --line: #e5e9f1;
  --line-strong: #d9dfeb;
  --accent: #5a67f2;
  --accent-hover: #4d59dc;
  --accent-soft: #eef0ff;
  --accent-text: #4955d2;
  --shadow: 0 8px 24px rgba(30, 43, 74, .045);
  --danger: #ef5f72;
  --success: #19a879;
  --radius: 14px;
  --radius-sm: 10px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10131b;
  --panel: #171b25;
  --panel-soft: #1d2230;
  --text: #eef2fa;
  --muted: #9da7b9;
  --muted-2: #717c91;
  --line: #293142;
  --line-strong: #354056;
  --accent: #7d87ff;
  --accent-hover: #8e96ff;
  --accent-soft: rgba(111, 122, 255, .15);
  --accent-text: #aab0ff;
  --shadow: 0 12px 30px rgba(0, 0, 0, .18);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}
button, textarea { font: inherit; }
button { color: inherit; }
svg { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.hidden { display: none !important; }

.app { min-height: 100vh; padding: 16px; }
.topbar {
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2px 12px;
}
.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 11px;
  display: grid; place-items: center;
  color: var(--accent); background: var(--panel); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.brand-mark svg { width: 20px; height: 20px; }
.brand-copy h1 { margin: 0; font-size: 20px; line-height: 1.22; letter-spacing: -.3px; }
.brand-copy p { margin: 3px 0 0; color: var(--muted); font-size: 12px; }
.brand-copy strong { color: var(--text); font-weight: 600; }
.top-actions { display: flex; gap: 8px; }
.top-action {
  height: 36px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px;
  display: inline-flex; align-items: center; gap: 7px; background: var(--panel); cursor: pointer;
  box-shadow: 0 3px 12px rgba(30,43,74,.025);
}
.top-action:hover { border-color: var(--line-strong); background: var(--panel-soft); }
.top-action svg { width: 16px; height: 16px; }

.workspace {
  height: calc(100vh - 90px);
  display: grid;
  grid-template-columns: 286px minmax(390px, 460px) minmax(430px, 1fr);
  gap: 12px;
}
.column { min-height: 0; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.sidebar-column { display: flex; flex-direction: column; gap: 12px; min-height: 0; }
.group-card { padding: 15px; flex: 0 0 auto; }
.card-title { font-weight: 700; font-size: 13px; margin-bottom: 10px; }
.group-list { display: grid; gap: 5px; }
.group-item {
  border: 0; width: 100%; height: 42px; padding: 0 9px;
  display: grid; grid-template-columns: 28px 1fr auto; align-items: center; gap: 9px;
  border-radius: 9px; background: transparent; cursor: pointer; text-align: left;
}
.group-item:hover { background: var(--panel-soft); }
.group-item.active { color: var(--accent-text); background: var(--accent-soft); }
.group-icon { width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center; font-size: 11px; font-weight: 800; }
.group-icon svg { width: 16px; height: 16px; }
.all-icon { color: #6670e9; background: #eef0ff; }
.outlook-icon { color: #1768df; background: #eaf2ff; }
.hotmail-icon { color: #ec6b39; background: #fff0e9; }
.icloud-icon { color: #5d718a; background: #eef3f7; }
:root[data-theme="dark"] .all-icon,
:root[data-theme="dark"] .outlook-icon,
:root[data-theme="dark"] .hotmail-icon,
:root[data-theme="dark"] .icloud-icon { background: var(--panel-soft); }
.group-name { min-width: 0; font-weight: 600; }
.group-count { color: var(--muted); font-size: 11px; white-space: nowrap; }
.group-count b { color: inherit; }

.account-card { min-height: 0; flex: 1; padding: 15px; display: flex; flex-direction: column; }
.account-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.account-header h2 { margin: 0; font-size: 16px; }
.small-count { min-width: 24px; height: 24px; padding: 0 7px; border-radius: 8px; display: grid; place-items: center; background: var(--panel-soft); color: var(--muted); font-size: 12px; }
.single-tab { height: 34px; display: flex; align-items: center; width: max-content; padding: 0 4px; font-weight: 600; border-bottom: 2px solid transparent; color: var(--muted); }
.single-tab.active { color: var(--accent-text); border-color: var(--accent); }
textarea {
  width: 100%; min-height: 105px; resize: vertical; margin-top: 9px; padding: 11px 12px;
  background: var(--panel-soft); color: var(--text); border: 1px solid var(--line); border-radius: var(--radius-sm);
  outline: none; line-height: 1.6; font-size: 12px;
}
textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
textarea::placeholder { color: var(--muted-2); }
.action-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 9px; }
.primary-btn, .secondary-btn {
  height: 37px; border-radius: 9px; display: inline-flex; align-items: center; justify-content: center; gap: 7px; font-weight: 650; cursor: pointer;
}
.primary-btn { border: 1px solid var(--accent); background: var(--accent); color: #fff; box-shadow: 0 5px 13px rgba(90,103,242,.17); }
.primary-btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.primary-btn:disabled { opacity: .55; cursor: not-allowed; }
.secondary-btn { border: 1px solid var(--line); background: var(--panel); }
.secondary-btn:hover { background: var(--panel-soft); border-color: var(--line-strong); }
.setting-block { margin-top: 14px; }
.setting-label { color: var(--muted); font-size: 12px; margin-bottom: 7px; }
.segmented {
  padding: 3px; display: inline-flex; align-items: center; gap: 2px; background: var(--panel-soft); border: 1px solid var(--line); border-radius: 9px;
}
.segmented.full { width: 100%; }
.segmented button {
  min-width: 0; height: 30px; padding: 0 11px; flex: 1; border: 0; border-radius: 7px; background: transparent; color: var(--muted); font-size: 12px; cursor: pointer; white-space: nowrap;
}
.segmented button:hover { color: var(--text); }
.segmented button.active { background: var(--panel); color: var(--text); font-weight: 650; box-shadow: 0 2px 7px rgba(30,43,74,.07); }
.quantity-row { display: flex; justify-content: space-between; align-items: center; margin: 13px 1px 8px; color: var(--muted); font-size: 12px; }
.quantity-row strong { color: var(--text); font-weight: 600; }
.mailbox-area { position: relative; flex: 1; min-height: 120px; overflow: auto; border-top: 1px solid var(--line); padding-top: 8px; }
.mailbox-list { display: grid; gap: 6px; }
.mailbox-item {
  border: 1px solid transparent; background: transparent; border-radius: 9px; padding: 9px 10px; text-align: left; cursor: pointer;
}
.mailbox-item:hover { background: var(--panel-soft); }
.mailbox-item.active { background: var(--accent-soft); border-color: rgba(90,103,242,.22); }
.mailbox-item-top { display: flex; align-items: center; gap: 7px; }
.mailbox-item-top strong { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; }
.provider-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex: 0 0 auto; }
.mailbox-item small { color: var(--muted); font-size: 10px; margin-left: 14px; }
.context-strip { display: grid; grid-template-columns: auto 1fr auto 1fr; gap: 5px 7px; align-items: center; padding: 9px 10px; margin-top: 9px; border-radius: 9px; background: var(--panel-soft); color: var(--muted); font-size: 10px; }
.context-strip b { color: var(--text); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.empty-state { height: 100%; min-height: 200px; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--muted-2); text-align: center; }
.empty-state.compact { min-height: 125px; }
.empty-state p { margin: 10px 0 0; font-size: 12px; }
.empty-illustration { color: #bcc4d3; }
.empty-illustration svg { width: 68px; height: 56px; stroke-width: 1.5; }
:root[data-theme="dark"] .empty-illustration { color: #596477; }

.mail-column { display: flex; flex-direction: column; padding: 16px; min-height: 0; }
.mail-column-header { height: 40px; display: flex; align-items: center; justify-content: space-between; }
.mail-column-header h2 { margin: 0; font-size: 18px; }
.fetch-btn { height: 36px; padding: 0 14px; }
.fetch-btn svg { width: 16px; height: 16px; }
.list-title-row { display: flex; align-items: baseline; gap: 8px; margin-top: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.list-title-row h3 { margin: 0; font-size: 14px; }
.list-title-row span { color: var(--muted); font-size: 11px; }
.filter-section { display: grid; gap: 8px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.split-row { display: flex; justify-content: space-between; gap: 8px; }
.split-row .segmented:first-child { flex: 1.35; }
.split-row .segmented:last-child { flex: 1; }
.mail-list-area { flex: 1; min-height: 0; overflow: auto; padding-top: 8px; }
.message-list { display: grid; gap: 6px; }
.message-item { width: 100%; padding: 11px 11px 10px; border: 1px solid transparent; border-radius: 10px; background: transparent; text-align: left; cursor: pointer; }
.message-item:hover { background: var(--panel-soft); }
.message-item.active { border-color: rgba(90,103,242,.25); background: var(--accent-soft); }
.message-top { display: flex; justify-content: space-between; gap: 8px; }
.message-top strong { font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.message-top time { color: var(--muted); font-size: 10px; white-space: nowrap; }
.message-subject { margin-top: 5px; font-weight: 650; font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.message-preview { margin-top: 4px; color: var(--muted); font-size: 11px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.message-tags { display: flex; gap: 5px; margin-top: 7px; }
.message-tag { display: inline-flex; align-items: center; height: 20px; padding: 0 6px; border-radius: 6px; color: var(--muted); background: var(--panel-soft); font-size: 9px; }
.message-tag.code { color: var(--accent-text); background: var(--accent-soft); }

.detail-column { position: relative; min-height: 0; overflow: hidden; }
.detail-empty { height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; color: var(--muted); }
.detail-empty .empty-illustration svg { width: 82px; height: 68px; }
.detail-empty h3 { margin: 14px 0 4px; color: var(--text); font-size: 17px; }
.detail-empty p { margin: 0; font-size: 12px; }
.detail-content { height: 100%; overflow: auto; padding: 22px 24px 30px; }
.detail-toolbar { display: flex; align-items: center; justify-content: space-between; }
.provider-badge { display: inline-flex; height: 25px; align-items: center; padding: 0 8px; border-radius: 7px; background: var(--accent-soft); color: var(--accent-text); font-size: 10px; font-weight: 650; }
.icon-btn { width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); cursor: pointer; }
.icon-btn:hover:not(:disabled) { background: var(--panel-soft); }
.icon-btn:disabled { opacity: .4; cursor: not-allowed; }
.icon-btn svg { width: 16px; height: 16px; }
.detail-content > h2 { margin: 18px 0 14px; font-size: 23px; line-height: 1.35; letter-spacing: -.35px; }
.sender-block { display: grid; grid-template-columns: 38px 1fr auto; gap: 10px; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.avatar { width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-text); font-weight: 750; }
.sender-block strong { font-size: 12px; }
.sender-block p { margin: 3px 0 0; color: var(--muted); font-size: 10px; }
.sender-block time { color: var(--muted); font-size: 10px; }
.code-box { margin: 17px 0; padding: 14px 15px; display: grid; grid-template-columns: 1fr auto auto; gap: 12px; align-items: center; border-radius: 11px; background: var(--accent-soft); }
.code-box span { color: var(--accent-text); font-size: 11px; }
.code-box strong { color: var(--accent-text); font-size: 24px; letter-spacing: 3px; }
.code-box button { border: 0; background: var(--panel); color: var(--accent-text); height: 30px; padding: 0 10px; border-radius: 7px; cursor: pointer; }
.meta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 16px; }
.meta-grid > div { padding: 11px 12px; border-radius: 9px; background: var(--panel-soft); }
.meta-grid span { display: block; color: var(--muted); font-size: 10px; margin-bottom: 5px; }
.meta-grid strong { display: block; font-size: 11px; overflow-wrap: anywhere; }
.message-body { margin-top: 17px; padding-top: 17px; border-top: 1px solid var(--line); color: var(--text); line-height: 1.8; font-size: 13px; white-space: pre-wrap; overflow-wrap: anywhere; }

.toast { position: fixed; left: 50%; bottom: 22px; transform: translate(-50%, 12px); opacity: 0; pointer-events: none; padding: 9px 14px; border-radius: 9px; background: #172033; color: #fff; font-size: 12px; box-shadow: 0 12px 35px rgba(0,0,0,.2); transition: .2s ease; z-index: 20; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 1120px) {
  body { overflow: auto; }
  .workspace { height: auto; min-height: calc(100vh - 74px); grid-template-columns: 280px 1fr; }
  .detail-column { grid-column: 1 / -1; min-height: 520px; }
}
@media (max-width: 760px) {
  .app { padding: 10px; }
  .topbar { height: auto; min-height: 58px; }
  .brand-mark { display: none; }
  .top-action { padding: 0 9px; }
  .workspace { height: auto; display: block; }
  .sidebar-column, .mail-column, .detail-column { margin-bottom: 10px; }
  .group-card { display: none; }
  .account-card { min-height: 520px; }
  .mail-column { min-height: 620px; }
  .detail-column { min-height: 500px; }
  .split-row { display: grid; }
}

/* Hotmail account/password session form */
button, textarea, input { font: inherit; }
.group-item:disabled { opacity: .52; cursor: not-allowed; }
.login-form { margin-top: 9px; display: grid; gap: 10px; }
.field-group { display: grid; gap: 6px; color: var(--muted); font-size: 11px; }
.field-group > input,
.password-wrap input {
  width: 100%; height: 39px; padding: 0 11px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--panel-soft); color: var(--text); outline: none; font-size: 12px;
}
.field-group > input:focus,
.password-wrap input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.field-group input::placeholder { color: var(--muted-2); }
.password-wrap { position: relative; }
.password-wrap input { padding-right: 52px; }
.password-toggle { position: absolute; right: 5px; top: 5px; height: 29px; padding: 0 8px; border: 0; border-radius: 7px; background: transparent; color: var(--muted); font-size: 10px; cursor: pointer; }
.password-toggle:hover { background: var(--panel); color: var(--text); }
.login-hint { margin: -1px 1px 0; color: var(--muted); font-size: 10px; line-height: 1.55; }
.session-status { display: grid; grid-template-columns: 9px 1fr; gap: 9px; align-items: start; margin-top: 11px; padding: 10px 11px; border: 1px solid var(--line); border-radius: 9px; background: var(--panel-soft); }
.status-dot { width: 7px; height: 7px; margin-top: 4px; border-radius: 50%; background: var(--muted-2); box-shadow: 0 0 0 3px color-mix(in srgb, var(--muted-2) 14%, transparent); }
.session-status.connected .status-dot { background: var(--success); box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 14%, transparent); }
.session-status strong { display: block; font-size: 11px; }
.session-status p { margin: 3px 0 0; color: var(--muted); font-size: 10px; line-height: 1.45; }

/* V4: target-style account content recognition */
.recognize-form { margin-top: 9px; display: grid; gap: 0; }
.recognize-form textarea { min-height: 92px; max-height: 180px; margin-top: 0; }
.provider-hotmail { background: #ec6b39; }
.provider-outlook { background: #1768df; }
.provider-icloud { background: #73859a; }
.provider-other { background: #9ba4b5; }

/* V5: automatic recognition, target-style mail cards, HTML body rendering */
.mail-count { color: var(--muted); font-size: 13px; font-weight: 600; }
.fetch-btn {
  min-width: 126px;
  border-color: #111;
  background: #111;
  box-shadow: 0 7px 18px rgba(0,0,0,.12);
}
.fetch-btn:hover { border-color: #242424; background: #242424; }
.fetch-btn.is-loading svg { animation: fetch-pulse .9s ease-in-out infinite alternate; }
@keyframes fetch-pulse { from { opacity: .35; transform: translateY(1px); } to { opacity: 1; transform: translateY(-1px); } }
:root[data-theme="dark"] .fetch-btn { border-color: #fff; background: #fff; color: #111; }

.list-title-row h3 {
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--panel-soft);
  font-size: 12px;
}
.list-title-row { align-items: center; }
.list-title-row span { font-size: 12px; }

.split-row.target-filter-row,
.split-row { align-items: stretch; }
.split-row .mail-search { flex: 1.2; }
.mail-search {
  min-width: 112px;
  height: 38px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--muted);
}
.mail-search:focus-within { border-color: var(--line-strong); box-shadow: 0 0 0 3px rgba(90,103,242,.08); }
.mail-search svg { width: 15px; height: 15px; flex: 0 0 auto; }
.mail-search input {
  width: 100%; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--text); font-size: 12px;
}
.mail-search input::placeholder { color: var(--muted-2); }

.mail-list-area { padding: 14px 2px 4px; }
.message-list { gap: 10px; }
.message-item {
  position: relative;
  display: grid;
  grid-template-columns: 5px minmax(0, 1fr);
  gap: 14px;
  width: 100%;
  min-height: 150px;
  padding: 18px 17px 16px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 17px;
  background: var(--panel);
  box-shadow: 0 3px 12px rgba(20,31,53,.025);
  text-align: left;
  cursor: pointer;
  transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.message-item:hover {
  background: var(--panel);
  border-color: #bfc6d2;
  box-shadow: 0 8px 20px rgba(20,31,53,.065);
  transform: translateY(-1px);
}
.message-item.active {
  border: 2px solid #111;
  padding: 17px 16px 15px;
  background: var(--panel);
  box-shadow: 0 9px 24px rgba(0,0,0,.08);
}
:root[data-theme="dark"] .message-item.active { border-color: #fff; }
.message-accent {
  display: block;
  width: 5px;
  height: 100%;
  min-height: 110px;
  border-radius: 999px;
  background: #dce1ea;
}
.message-item.active .message-accent { background: #111; }
:root[data-theme="dark"] .message-item.active .message-accent { background: #fff; }
.message-card-main { display: block; min-width: 0; }
.message-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.message-top strong {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-size: 13px;
  overflow: hidden;
  white-space: nowrap;
}
.message-top strong b { overflow: hidden; text-overflow: ellipsis; }
.message-top strong em {
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
  font-size: 11px;
  font-style: normal;
  font-weight: 650;
}
.message-top time { color: var(--muted); font-size: 11px; white-space: nowrap; }
.message-subject {
  display: block;
  margin-top: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
  font-size: 14px;
  font-weight: 750;
}
.message-preview {
  display: -webkit-box;
  margin-top: 7px;
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
  white-space: normal;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.message-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.message-tag {
  height: 23px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 10px;
  font-weight: 650;
}
.message-tag.folder-tag { border-color: #a8efc9; background: #edfff4; color: #00a65a; }
.message-tag.newest-tag { border-color: #ffe5a0; background: #fff4c7; color: #e28a00; }
.message-tag.unread-tag { border-color: var(--line); background: var(--panel-soft); }
.message-tag.code { border-color: #dbe2ff; background: #edf1ff; color: #3158f5; }
:root[data-theme="dark"] .message-tag.folder-tag { border-color: #1e6e4a; background: #163a2a; color: #75e6aa; }
:root[data-theme="dark"] .message-tag.newest-tag { border-color: #6c5620; background: #3e321a; color: #ffd36d; }

.detail-content { padding: 26px 34px 36px; }
.detail-toolbar { min-height: 40px; }
.copy-code-primary {
  height: 38px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 15px;
  border: 1px solid #111;
  border-radius: 12px;
  background: #111;
  color: #fff;
  font-size: 12px;
  font-weight: 750;
  cursor: pointer;
}
.copy-code-primary:disabled { opacity: .35; cursor: not-allowed; }
.copy-code-primary svg { width: 15px; height: 15px; }
:root[data-theme="dark"] .copy-code-primary { border-color: #fff; background: #fff; color: #111; }
.detail-content > h2 {
  margin: 24px 0 18px;
  color: var(--text);
  font-size: clamp(25px, 2.1vw, 38px);
  line-height: 1.25;
  letter-spacing: -1px;
}
.detail-meta-lines {
  display: grid;
  gap: 12px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.detail-meta-lines > div { display: grid; grid-template-columns: 78px minmax(0, 1fr); gap: 12px; align-items: baseline; }
.detail-meta-lines span { color: var(--muted); font-size: 13px; }
.detail-meta-lines strong { min-width: 0; color: var(--text); font-size: 13px; overflow-wrap: anywhere; }
.detail-meta-lines b { font-weight: 700; }
.detail-meta-lines em { font-style: normal; font-weight: 500; }
.code-box {
  margin: 30px auto 26px;
  min-height: 154px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 22px;
  border-radius: 22px;
  background: #f5f6f8;
  color: #111;
}
.code-box span { color: #5e6b84; font-size: 13px; }
.code-box strong { color: #111; font-size: clamp(42px, 4vw, 58px); letter-spacing: 10px; line-height: 1; }
.code-box button { display: none; }
:root[data-theme="dark"] .code-box { background: #202530; color: #fff; }
:root[data-theme="dark"] .code-box strong { color: #fff; }
.detail-folder-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 11px;
}
.detail-folder-row strong { color: var(--text); }
.message-body {
  margin-top: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  color: #111;
  line-height: 1.75;
  font-size: 14px;
  overflow: hidden;
}
.message-body.plain-text { min-height: 280px; padding: 28px; white-space: pre-wrap; overflow-wrap: anywhere; }
.message-body.html-body { min-height: 360px; }
.email-html-frame { display: block; width: 100%; min-height: 360px; border: 0; background: #fff; }
:root[data-theme="dark"] .message-body { border-color: var(--line); background: #fff; color: #111; }

@media (max-width: 1320px) {
  .workspace { grid-template-columns: 280px minmax(390px, 450px) minmax(480px, 1fr); }
  .detail-content { padding: 24px; }
}
@media (max-width: 920px) {
  .split-row { display: grid; grid-template-columns: 1fr 1fr; }
  .mail-search { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
  .message-item { min-height: 140px; padding: 15px; }
  .message-item.active { padding: 14px; }
  .detail-content { padding: 20px 16px 28px; }
  .detail-meta-lines > div { grid-template-columns: 62px minmax(0, 1fr); }
  .code-box strong { letter-spacing: 6px; }
}