:root {
  color-scheme: light;
  --canvas: #f7f9fa;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-hover: #fbfdfd;
  --ink: #10212b;
  --muted: #52636b;
  --border: #d8e1e5;
  --border-strong: #a9b9be;
  --primary: #087f8c;
  --primary-hover: #06636d;
  --focus: #0b7285;
  --selection: #e6f1f2;
  --success: #26734d;
  --info: #2563a6;
  --warning: #8a5a00;
  --danger: #b42318;
  --surface-subtle: #f0f4f5;
  --surface-note: #f0f4f5;
  --body-ink: #293b43;
  --field-border: #aebdc1;
  --divider: #edf1f2;
  --canvas-shadow: rgb(16 33 43 / 8%);
  --shadow: 0 8px 24px rgb(16 33 43 / 12%);
  --glow: none;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-synthesis: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --canvas: #0b1014;
    --surface: #111a20;
    --surface-raised: #16232a;
    --surface-hover: #1a2a32;
    --ink: #e7f0f2;
    --muted: #a7bbc0;
    --border: #2b4148;
    --border-strong: #41616a;
    --primary: #63d8e2;
    --primary-hover: #8beaf0;
    --focus: #8beaf0;
    --selection: #18363d;
    --success: #72d39a;
    --info: #82b9f2;
    --warning: #f0c36b;
    --danger: #ff8f86;
    --surface-subtle: #1a2a32;
    --surface-note: #16232a;
    --body-ink: #d4e2e5;
    --field-border: #41616a;
    --divider: #2b4148;
    --canvas-shadow: rgb(0 0 0 / 24%);
    --shadow: 0 10px 28px rgb(0 0 0 / 28%);
    --glow: 0 0 16px rgb(99 216 226 / 14%);
  }
}

:root[data-theme="day"] { color-scheme: light; }
:root[data-theme="night"] {
  color-scheme: dark;
  --canvas: #0b1014;
  --surface: #111a20;
  --surface-raised: #16232a;
  --surface-hover: #1a2a32;
  --ink: #e7f0f2;
  --muted: #a7bbc0;
  --border: #2b4148;
  --border-strong: #41616a;
  --primary: #63d8e2;
  --primary-hover: #8beaf0;
  --focus: #8beaf0;
  --selection: #18363d;
  --success: #72d39a;
  --info: #82b9f2;
  --warning: #f0c36b;
  --danger: #ff8f86;
  --surface-subtle: #1a2a32;
  --surface-note: #16232a;
  --body-ink: #d4e2e5;
  --field-border: #41616a;
  --divider: #2b4148;
  --canvas-shadow: rgb(0 0 0 / 24%);
  --shadow: 0 10px 28px rgb(0 0 0 / 28%);
  --glow: 0 0 16px rgb(99 216 226 / 14%);
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; background: var(--canvas); }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 10; top: 8px; left: 8px; padding: 10px 14px; color: #fff; background: var(--ink); border-radius: 8px; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.app-shell { display: grid; grid-template-columns: 232px minmax(0, 1fr); min-height: 100vh; }
.topbar { position: fixed; z-index: 2; top: 0; left: 0; display: flex; align-items: center; justify-content: space-between; width: 232px; height: 72px; padding: 0 24px; background: var(--surface); border-right: 1px solid var(--border); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-size: 18px; font-weight: 700; letter-spacing: -.02em; }
.brand-mark { display: inline-flex; align-items: end; gap: 3px; width: 22px; height: 22px; }
.brand-mark i { display: block; width: 4px; border-radius: 4px; background: var(--primary); transform: skew(-22deg); }
.brand-mark i:nth-child(1) { height: 10px; opacity: .65; }.brand-mark i:nth-child(2) { height: 16px; opacity: .82; }.brand-mark i:nth-child(3) { height: 22px; }
.topbar-actions { display: none; gap: 8px; align-items: center; }
.mobile-nav { display: none; }
.mobile-nav a { overflow-wrap: anywhere; }
.icon-button, .avatar, .row-action { display: inline-grid; place-items: center; min-width: 44px; min-height: 44px; padding: 0; color: var(--muted); background: transparent; border: 1px solid transparent; border-radius: 8px; }
.icon-button:hover, .row-action:hover { color: var(--ink); background: var(--surface-hover); }
.avatar { color: #fff; background: var(--ink); border: 0; font-size: 12px; font-weight: 700; }
.sidebar { position: fixed; top: 72px; bottom: 0; left: 0; display: flex; flex-direction: column; width: 232px; padding: 20px 12px 16px; background: var(--surface); border-right: 1px solid var(--border); }
.compose-button { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; min-height: 44px; margin-bottom: 20px; color: #fff; background: var(--primary); border-radius: 8px; font-weight: 650; }
.compose-button:hover, .reply-button:hover { background: var(--primary-hover); }
.account-switcher { display: flex; align-items: center; gap: 9px; min-height: 52px; padding: 8px; margin-bottom: 18px; border: 1px solid var(--border); border-radius: 8px; }
.account-switcher strong, .account-switcher small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }.account-switcher strong { font-size: 12px; }.account-switcher small { max-width: 145px; margin-top: 2px; color: var(--muted); font-size: 11px; }.account-dot { flex: none; width: 8px; height: 8px; background: #26734d; border-radius: 99px; }.chevron { margin-left: auto; color: var(--muted); }
.nav-label { margin: 0 10px 7px; color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.nav-item { display: flex; align-items: center; gap: 11px; min-height: 44px; padding: 0 10px; margin: 1px 0; color: var(--muted); border-radius: 7px; font-size: 14px; }.nav-item:hover { color: var(--ink); background: var(--surface-hover); }.nav-item.active { color: var(--ink); background: var(--selection); font-weight: 650; }.nav-item span { width: 18px; color: var(--primary); font-size: 17px; text-align: center; }.nav-item b { margin-left: auto; color: var(--primary); font-size: 12px; }.nav-item .quiet-count { color: var(--muted); font-weight: 500; }.sidebar-footer { margin-top: auto; }
.main-content { grid-column: 2; width: 100%; max-width: 1480px; padding: 104px 40px 48px; margin: 0 auto; }
.content-header { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }.content-header h1 { margin: 0; font-size: 28px; letter-spacing: -.035em; line-height: 1.2; }.heading-count { margin-left: 10px; color: var(--muted); font-size: 13px; font-weight: 500; letter-spacing: 0; vertical-align: middle; }.quiet-button { min-height: 44px; padding: 9px 12px; color: var(--muted); background: transparent; border: 1px solid var(--border); border-radius: 7px; font-size: 13px; }.quiet-button:hover { color: var(--ink); border-color: var(--border-strong); background: var(--surface); }
.toolbar { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }.search-field { display: flex; align-items: center; gap: 8px; width: min(360px, 100%); min-height: 44px; padding: 0 10px; color: var(--muted); background: var(--surface); border: 1px solid var(--border); border-radius: 7px; }.search-field:focus-within { border-color: var(--focus); box-shadow: 0 0 0 2px rgb(11 114 133 / 18%); }.search-field input { min-width: 0; width: 100%; color: var(--ink); background: transparent; border: 0; outline: 0; }.search-field kbd { padding: 2px 6px; color: var(--muted); background: var(--surface-subtle); border: 1px solid var(--border); border-radius: 4px; font-size: 11px; }.filter-chip { min-height: 44px; padding: 0 12px; color: var(--muted); background: transparent; border: 1px solid transparent; border-radius: 99px; font-size: 13px; white-space: nowrap; }.filter-chip:hover, .filter-chip.selected { color: var(--ink); background: var(--surface); border-color: var(--border); }.filter-chip.selected { color: var(--primary); font-weight: 650; }
.inbox-layout { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(320px, .92fr); gap: 20px; margin-top: 12px; }.message-list, .reading-pane { min-width: 0; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }.message-row { position: relative; display: grid; grid-template-columns: 44px 34px minmax(0, 1fr) 44px; gap: 8px; align-items: start; min-height: 76px; padding: 10px 12px; border-bottom: 1px solid var(--border); }.message-row:last-child { border-bottom: 0; }.message-row:hover, .message-row.selected { background: var(--surface-hover); }.message-row.selected { box-shadow: inset 3px 0 var(--primary); }.row-select { display: grid; place-items: center; width: 44px; height: 44px; }.row-select input { width: 18px; height: 18px; accent-color: var(--primary); }.sender-avatar { display: grid; place-items: center; width: 34px; height: 34px; color: #fff; border-radius: 9px; font-size: 11px; font-weight: 700; }.blue { background: #3478a6; }.purple { background: #7969a7; }.coral { background: #c76759; }.teal { background: #378e8c; }.message-open { display: block; min-width: 0; min-height: 56px; padding: 1px 0; color: inherit; }.message-copy { min-width: 0; }.message-meta { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 12px; }.message-meta strong { overflow: hidden; color: var(--ink); text-overflow: ellipsis; white-space: nowrap; }.message-meta time { flex: none; }.message-copy h2 { overflow: hidden; margin: 4px 0 2px; font-size: 14px; font-weight: 650; text-overflow: ellipsis; white-space: nowrap; }.message-copy p { overflow: hidden; margin: 0; color: var(--muted); font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }.message-row.unread .message-copy h2 { font-weight: 750; }.message-tag { display: inline-flex; align-items: center; min-height: 22px; margin-top: 5px; padding: 2px 8px; color: var(--muted); background: var(--surface-hover); border-radius: 99px; font-size: 11px; }.message-tag.reply { color: var(--info); background: color-mix(in srgb, var(--info) 16%, var(--surface)); }.message-tag.vip { color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, var(--surface)); }.message-tag.list-tag { color: var(--muted); background: var(--surface-hover); }
.reading-pane { min-height: 520px; padding: 24px; }.pane-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }.reading-pane h2 { margin: 0 0 18px; font-size: 21px; letter-spacing: -.025em; }.recipient { display: flex; align-items: center; gap: 10px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }.recipient strong, .recipient span { display: block; }.recipient strong { font-size: 13px; }.recipient span { margin-top: 3px; color: var(--muted); font-size: 11px; }.recipient time { margin-left: auto; color: var(--muted); font-size: 11px; }.safety-strip { display: flex; gap: 9px; margin: 18px 0; padding: 11px 12px; color: var(--info); background: color-mix(in srgb, var(--info) 12%, var(--surface)); border-radius: 7px; }.safety-strip > span:first-child { display: grid; place-items: center; flex: none; width: 18px; height: 18px; color: var(--surface); background: var(--success); border-radius: 99px; font-size: 11px; }.safety-strip strong, .safety-strip small { display: block; }.safety-strip strong { font-size: 12px; }.safety-strip small { margin-top: 2px; color: var(--muted); font-size: 11px; }.thread-page { width: min(100% - 32px, 860px); padding: 40px 0 64px; margin: 0 auto; }.back-link { display: inline-flex; align-items: center; min-height: 44px; margin-bottom: 16px; color: var(--primary); font-weight: 650; }.thread-card { padding: clamp(20px, 4vw, 40px); background: var(--surface); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); }.thread-header, .compose-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }.thread-header h1, .compose-header h1 { margin: 0; font-size: clamp(24px, 4vw, 32px); line-height: 1.2; letter-spacing: -.035em; }.thread-actions { display: flex; flex-wrap: wrap; gap: 8px; }.quiet-button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 9px 12px; color: var(--muted); background: transparent; border: 1px solid var(--border); border-radius: 7px; font-size: 13px; }.message-details { display: flex; align-items: center; gap: 12px; padding: 24px 0 18px; margin-top: 24px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }.message-details strong, .message-details span { display: block; }.message-details strong { font-size: 14px; }.message-details span { margin-top: 3px; color: var(--muted); font-size: 13px; }.message-details time { margin-left: auto; color: var(--muted); font-size: 13px; }.message-body { color: var(--body-ink); font-size: 16px; line-height: 1.75; }.message-body p { margin: 0 0 18px; }.reply-button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; margin-top: 12px; color: #fff; background: var(--primary); border: 0; border-radius: 7px; font-weight: 650; }.compose-card { max-width: 720px; margin: 0 auto; }.draft-status { margin: 5px 0 0; color: var(--muted); font-size: 13px; }.compose-note { padding: 12px 14px; margin: 24px 0; color: var(--muted); background: #f0f4f5; border-left: 3px solid var(--border); font-size: 14px; }.field-group { margin: 0 0 18px; }.field-group label { display: block; margin-bottom: 7px; font-size: 14px; font-weight: 650; }.field-group input, .field-group select, .field-group textarea { width: 100%; min-height: 44px; padding: 10px 12px; color: var(--ink); background: var(--surface); border: 1px solid #aebdc1; border-radius: 7px; }.field-group textarea { min-height: 220px; resize: vertical; line-height: 1.5; }.compose-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 24px; }.compose-actions .reply-button { margin-top: 0; }.secondary-button { min-height: 44px; padding: 0 16px; color: var(--ink); background: var(--surface); border: 1px solid var(--border); border-radius: 7px; font-weight: 650; }.discard-link { min-height: 44px; padding: 12px 8px; color: var(--danger); font-weight: 650; }
@media (max-width: 1050px) { .main-content { padding-right: 24px; padding-left: 24px; }.inbox-layout { grid-template-columns: minmax(0, 1fr) minmax(280px, .82fr); gap: 12px; }.reading-pane { padding: 18px; } }
@media (max-width: 800px) { .app-shell { display: block; padding-bottom: 72px; }.topbar { position: sticky; top: 0; left: auto; z-index: 5; width: 100%; height: 64px; padding: 0 16px; border-right: 0; border-bottom: 1px solid var(--border); }.topbar-actions { display: flex; }.mobile-menu, .mobile-compose { display: inline-flex; align-items: center; justify-content: center; }.mobile-compose { min-height: 44px; padding: 0 8px; color: var(--primary); font-size: 13px; white-space: normal; }.sidebar { position: static; display: none; }.main-content { padding: 24px 16px 40px; }.content-header { align-items: start; margin-bottom: 12px; }.quiet-button { display: none; }.toolbar { overflow-x: auto; padding-bottom: 4px; }.search-field { flex: 1 1 auto; min-width: 0; }.inbox-layout { display: block; }.reading-pane { display: none; }.message-list { border-radius: 8px; }.message-row { grid-template-columns: 44px 34px minmax(0, 1fr) 44px; padding: 10px 8px; }.content-header h1 { font-size: 24px; }.heading-count { display: block; margin: 4px 0 0; font-size: 12px; }.mobile-nav { position: fixed; z-index: 4; right: 0; bottom: 0; left: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); min-height: 64px; padding: 6px 8px max(6px, env(safe-area-inset-bottom)); background: var(--surface); border-top: 1px solid var(--border); box-shadow: 0 -4px 16px rgb(16 33 43 / 8%); }.mobile-nav a { display: flex; min-width: 0; flex-direction: column; align-items: center; justify-content: center; gap: 3px; padding: 4px 2px; color: var(--muted); font-size: 11px; font-weight: 650; line-height: 1.2; text-align: center; }.mobile-nav a.active { color: var(--primary); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; } }