:root {
  --bg: #f3f5f8;
  --surface: #ffffff;
  --surface-2: #eef1f6;
  --text: #1a1f2a;
  --text-muted: #667085;
  --border: #e3e7ee;
  --accent: #2f6fed;
  --accent-soft: rgba(47, 111, 237, 0.12);
  --accent-contrast: #ffffff;
  --danger: #d64545;
  --danger-soft: rgba(214, 69, 69, 0.12);
  --success: #1f9d63;
  --unread-dot: #2f6fed;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-md: 0 8px 24px rgba(16, 24, 40, 0.08);
  --topbar-h: 56px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
  --touch: 44px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151a;
    --surface: #1a1f27;
    --surface-2: #232933;
    --text: #e8ebf0;
    --text-muted: #9aa3b2;
    --border: #2d3440;
    --accent: #5b8dfb;
    --accent-soft: rgba(91, 141, 251, 0.16);
    --accent-contrast: #0b1020;
    --danger: #ef6a6a;
    --danger-soft: rgba(239, 106, 106, 0.16);
    --success: #3ecf8e;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 10px 28px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
html { height: 100%; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.45;
  color-scheme: light dark;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { margin: 0 0 0.5rem; line-height: 1.25; }
button { font: inherit; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.muted { color: var(--text-muted); }

/* ---------- icons ---------- */
.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}
.icon {
  width: 1.15em;
  height: 1.15em;
  flex-shrink: 0;
  display: inline-block;
  vertical-align: -0.15em;
}
.icon-sm { width: 1em; height: 1em; }
.icon-empty {
  width: 2.75rem;
  height: 2.75rem;
  color: var(--text-muted);
  opacity: 0.55;
  margin: 0 auto 0.85rem;
  display: block;
}
.icon-btn .icon { width: 1.2rem; height: 1.2rem; }
.icon-starred { color: #e6a23c; }
.icon-starred:hover { color: #d4922a; }
.btn .icon { width: 1.05rem; height: 1.05rem; }
.btn-label { display: inline-flex; align-items: center; gap: 0.4rem; }
.list-heading {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.list-heading .icon { width: 1.25rem; height: 1.25rem; color: var(--text-muted); }
.topbar-user > a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.attachments > strong {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.compose-form label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ---------- buttons / forms ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 40px;
  padding: 0.55rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn, .icon-btn, .hamburger, .account-menu-btn, .folder-list a, .msg-link, .pagination a {
  touch-action: manipulation;
}
.btn-primary { background: var(--accent); color: var(--accent-contrast); border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.05); border-color: var(--accent); }
.btn-danger { color: var(--danger); border-color: rgba(214, 69, 69, 0.35); background: var(--danger-soft); }
.btn-block { width: 100%; }
.icon-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  min-width: var(--touch);
  min-height: var(--touch);
  padding: 0.45rem;
  border-radius: 10px;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.icon-btn.danger:hover { color: var(--danger); background: var(--danger-soft); }

input[type="text"], input[type="email"], input[type="password"], input[type="number"],
input[type="file"], textarea, select {
  width: 100%;
  padding: 0.7rem 0.85rem;
  margin: 0.3rem 0 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
label { font-weight: 600; font-size: 0.9rem; }
.field-error { color: var(--danger); font-size: 0.85rem; margin: -0.55rem 0 0.75rem; }

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin: 0.65rem 1rem;
  border: 1px solid transparent;
}
.alert-error { background: var(--danger-soft); color: var(--danger); border-color: rgba(214, 69, 69, 0.25); }
.alert-success { background: var(--accent-soft); color: var(--accent); border-color: rgba(47, 111, 237, 0.25); }

/* ---------- auth page ---------- */
.auth-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: max(1.25rem, var(--safe-top)) 1.25rem max(1.25rem, var(--safe-bottom));
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(47, 111, 237, 0.14), transparent 55%),
    radial-gradient(900px 400px at 100% 0%, rgba(47, 111, 237, 0.08), transparent 50%),
    var(--bg);
}
.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.6rem 1.75rem;
  box-shadow: var(--shadow-md);
}
.auth-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}
.auth-brand img {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  box-shadow: 0 12px 28px rgba(47, 111, 237, 0.28);
}
.auth-card h1 { text-align: center; margin: 0; font-size: 1.4rem; letter-spacing: -0.02em; }
.auth-sub { text-align: center; color: var(--text-muted); margin: 0.35rem 0 1.35rem; font-size: 0.95rem; }

/* ---------- app shell ---------- */
.nav-toggle-checkbox,
.account-toggle-checkbox { display: none; }
.nav-overlay { display: none; }

.app-shell {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto auto 1fr;
  grid-template-areas:
    "topbar"
    "flash"
    "list";
  min-height: 100vh;
  min-height: 100dvh;
}
.app-shell.has-detail {
  grid-template-areas:
    "topbar"
    "flash"
    "detail";
}
.compose-shell {
  grid-template-areas:
    "topbar"
    "flash"
    "list";
}

.topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: var(--topbar-h);
  padding: max(0.45rem, var(--safe-top)) 0.85rem 0.45rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 30;
}
.hamburger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  min-width: var(--touch);
  min-height: var(--touch);
  border-radius: 10px;
  color: var(--text);
}
.hamburger .icon { width: 1.35rem; height: 1.35rem; }
.hamburger:hover { background: var(--surface-2); }
.account-menu-btn .icon { width: 1.25rem; height: 1.25rem; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  margin-right: auto;
  color: var(--text);
  text-decoration: none;
  min-width: 0;
}
.brand:hover { text-decoration: none; color: var(--text); }
.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  flex-shrink: 0;
  display: block;
}
.brand-name {
  letter-spacing: -0.015em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.btn-compose { white-space: nowrap; flex-shrink: 0; }
.topbar-user {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  position: relative;
}
.user-email {
  display: none;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.account-menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--touch);
  min-height: var(--touch);
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1.15rem;
}
.account-menu-btn:hover { background: var(--surface-2); color: var(--text); }
.account-menu {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 0.35rem);
  min-width: 220px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 0.4rem;
  z-index: 40;
}
.account-menu a,
.account-menu .account-email {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.7rem 0.85rem;
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
}
.account-menu a:hover { background: var(--surface-2); text-decoration: none; }
.account-menu .account-email {
  font-size: 0.82rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.25rem;
  border-radius: 8px 8px 0 0;
}
.account-menu .menu-danger { color: var(--danger); }
#account-toggle:checked ~ .account-menu { display: block; }
#account-toggle:checked ~ .account-menu-btn { background: var(--surface-2); color: var(--text); }

.flash { grid-area: flash; }

.folder-pane {
  grid-area: folder;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.folder-pane-head {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
}
.folder-pane-head strong {
  font-size: 0.85rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.folder-list { padding: 0.5rem 0.4rem 1rem; flex: 1; }
.folder-list li a {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-height: var(--touch);
  padding: 0.55rem 0.85rem;
  margin: 0.1rem 0;
  border-radius: 10px;
  color: var(--text);
}
.folder-list li a .icon {
  width: 1.15rem;
  height: 1.15rem;
  color: var(--text-muted);
}
.folder-list li.active a .icon { color: var(--accent); }
.folder-list li.active a {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}
.folder-list li a:hover { background: var(--surface-2); text-decoration: none; }

.list-pane {
  grid-area: list;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--surface);
  -webkit-overflow-scrolling: touch;
}
.list-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem 0.65rem;
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(8px);
  z-index: 5;
  border-bottom: 1px solid var(--border);
}
.list-toolbar-right { display: flex; align-items: center; gap: 0.35rem; }
.refresh-btn { display: inline-flex; align-items: center; justify-content: center; }
.refresh-btn:hover { text-decoration: none; }
.refresh-btn.htmx-request svg { animation: spin 0.8s linear infinite; }

.btn-send .spinner,
.btn-send .btn-label-busy { display: none; }
.htmx-request .btn-send .spinner,
.htmx-request .btn-send .btn-label-busy,
.is-submitting .btn-send .spinner,
.is-submitting .btn-send .btn-label-busy { display: inline-block; }
.htmx-request .btn-send .btn-label,
.is-submitting .btn-send .btn-label { display: none; }
.btn:disabled, a.btn[disabled] { opacity: 0.65; cursor: progress; pointer-events: none; }
.spinner {
  width: 0.9em;
  height: 0.9em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.message-list li.msg-row {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border);
  transition: background 0.12s ease;
}
.message-list li.msg-row:hover { background: color-mix(in srgb, var(--surface-2) 70%, transparent); }
.msg-link {
  flex: 1;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-rows: auto auto;
  column-gap: 0.65rem;
  row-gap: 0.1rem;
  padding: 0.85rem 0.85rem;
  color: var(--text);
  min-width: 0;
}
.msg-link:hover { text-decoration: none; }
.msg-unread-dot {
  grid-column: 1;
  grid-row: 1 / 3;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: transparent;
  align-self: center;
}
.msg-row.unread .msg-unread-dot { background: var(--unread-dot); }
.msg-row.unread .msg-link { font-weight: 650; }
.msg-row.selected { background: var(--accent-soft); }
.msg-from {
  grid-column: 2;
  grid-row: 1;
  font-size: 0.88rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.msg-row.unread .msg-from { color: var(--text); }
.msg-subject {
  grid-column: 2;
  grid-row: 2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.msg-date {
  grid-column: 3;
  grid-row: 1 / 3;
  align-self: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.msg-actions {
  display: none;
  align-items: center;
  gap: 0.05rem;
  padding-right: 0.35rem;
}
.empty-row, .empty-state {
  padding: 3rem 1.25rem;
  text-align: center;
  color: var(--text-muted);
}
.empty-state-card {
  max-width: 320px;
  margin: 2.5rem auto;
  padding: 1.75rem 1.25rem;
  text-align: center;
}
.empty-state-card h3 {
  margin: 0 0 0.4rem;
  color: var(--text);
  font-size: 1.1rem;
}
.empty-state-card p { margin: 0 0 1.1rem; color: var(--text-muted); }

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 1rem max(1rem, var(--safe-bottom));
  font-size: 0.9rem;
  color: var(--text-muted);
}
.pagination a {
  min-height: 40px;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  display: inline-flex;
  align-items: center;
}
.pagination a:hover { border-color: var(--accent); text-decoration: none; }

.detail-pane {
  grid-area: detail;
  overflow-y: auto;
  background: var(--surface);
  padding: 1rem 1.1rem max(2.5rem, calc(1.5rem + var(--safe-bottom)));
  -webkit-overflow-scrolling: touch;
}
.detail-header .back-link {
  display: none;
}
.detail-header h2 {
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  margin: 0.35rem 0 0.75rem;
  word-break: break-word;
}
.detail-meta { margin: 0.2rem 0; font-size: 0.9rem; color: var(--text-muted); word-break: break-word; }
.detail-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 4;
  padding: 0.5rem 0;
  background: linear-gradient(var(--surface) 70%, transparent);
}
.detail-toolbar .btn { flex: 1 1 auto; min-width: 7rem; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
  min-height: 36px;
  margin-bottom: 0.25rem;
  font-weight: 600;
}
.topbar > .back-link {
  margin-bottom: 0;
  min-height: var(--touch);
  padding: 0 0.35rem;
  border-radius: 10px;
  flex-shrink: 0;
}
.topbar > .back-link:hover { background: var(--surface-2); text-decoration: none; }
.attachments {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  background: var(--surface-2);
  border-radius: var(--radius);
}
.attachments ul { margin-top: 0.45rem; }
.attachments li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.6rem;
  padding: 0.35rem 0;
}
.detail-body { margin-top: 1rem; }
.text-body {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: inherit;
  margin: 0;
  line-height: 1.55;
}
.mail-frame {
  width: 100%;
  min-height: 220px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: var(--radius);
}

/* ---------- compose ---------- */
.compose-main {
  grid-area: list;
  padding: 1.1rem 1.1rem max(1.5rem, calc(1rem + var(--safe-bottom)));
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}
.compose-form textarea { min-height: 240px; resize: vertical; }
.compose-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.75rem;
  position: sticky;
  bottom: 0;
  padding: 0.75rem 0 max(0.5rem, var(--safe-bottom));
  background: linear-gradient(transparent, var(--bg) 30%);
}
.compose-actions .btn { flex: 1 1 8rem; }
.compose-shell .topbar .brand { font-weight: 650; }

/* ---------- admin ---------- */
.admin-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  margin-bottom: 1.1rem;
  box-shadow: var(--shadow-sm);
}
.admin-card h2 { font-size: 1.05rem; letter-spacing: -0.01em; }
.admin-card > .muted { margin-top: 0; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 -0.25rem; padding: 0 0.25rem; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.admin-table th, .admin-table td {
  text-align: left;
  padding: 0.7rem 0.55rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.admin-table th { color: var(--text-muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
.admin-table td.dns-value {
  white-space: normal;
  word-break: break-all;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8rem;
  line-height: 1.4;
}
.admin-table code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.tag-active { color: var(--success); font-weight: 600; }
.tag-suspended { color: var(--danger); font-weight: 600; }
.mailbox-input-row { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.mailbox-input-row input { flex: 1; margin: 0; min-width: 8rem; }
.admin-wide { max-width: 1040px; }
.admin-card h2 .tag-active,
.admin-card h2 .tag-suspended { font-size: 0.8rem; margin-left: 0.4rem; }
.inline-form { display: inline-flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; }
.inline-form input, .inline-form select { margin: 0; width: auto; }
.inline-form .size-input { width: 5.5rem; }
.usage-bar { height: 7px; min-width: 5rem; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.usage-bar > span { display: block; height: 100%; background: var(--accent); border-radius: inherit; }
.usage-bar.usage-high > span { background: var(--danger); }
.quota-box {
  margin-top: auto;
  padding: 0.9rem 1rem max(0.9rem, var(--safe-bottom));
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
}
.quota-box p { margin: 0.4rem 0 0; }

/* ============ Tablet: two-pane mail ============ */
@media (min-width: 760px) and (max-width: 1099px) {
  .app-shell:not(.compose-shell) {
    grid-template-columns: 280px 1fr;
    grid-template-areas:
      "topbar topbar"
      "flash flash"
      "list detail";
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
  }
  .app-shell.has-detail:not(.compose-shell) {
    grid-template-columns: 300px 1fr;
  }
  .app-shell:not(.compose-shell) .list-pane,
  .app-shell:not(.compose-shell) .detail-pane { min-height: 0; }
  .app-shell:not(.compose-shell) .folder-pane {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(300px, 82vw);
    transform: translateX(-105%);
    transition: transform 0.22s ease;
    z-index: 50;
    padding-top: calc(var(--topbar-h) + var(--safe-top));
    box-shadow: var(--shadow-md);
  }
  .app-shell:not(.compose-shell) .folder-pane-head { display: flex; }
  #nav-toggle:checked ~ .nav-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(10, 14, 22, 0.45);
    z-index: 40;
  }
  #nav-toggle:checked ~ .app-shell .folder-pane { transform: translateX(0); }
  .app-shell:not(.compose-shell) .list-pane,
  .app-shell:not(.compose-shell) .detail-pane { display: block !important; }
  .msg-actions { display: flex; }
  .app-shell:not(.compose-shell) .topbar-user > a,
  .app-shell:not(.compose-shell) .topbar-user > .user-email { display: none; }
  .account-menu-btn { display: inline-flex; }

  .compose-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "topbar"
      "flash"
      "list";
  }
}

/* ============ Desktop: three-pane mail ============ */
@media (min-width: 1100px) {
  .app-shell:not(.compose-shell),
  .app-shell.has-detail:not(.compose-shell) {
    grid-template-columns: 240px minmax(300px, 380px) 1fr;
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "topbar topbar topbar"
      "flash flash flash"
      "folder list detail";
    height: 100vh;
    height: 100dvh;
    min-height: 0;
    overflow: hidden;
  }
  .hamburger,
  .folder-pane-head,
  .account-menu-btn { display: none; }
  .folder-pane { position: static; transform: none; box-shadow: none; padding-top: 0; }
  .list-pane, .detail-pane { display: block !important; min-height: 0; }
  .user-email { display: inline; }
  .msg-actions { display: flex; }
  .topbar-user > a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.45rem 0.55rem;
    border-radius: 8px;
  }
  .topbar-user > a:hover { background: var(--surface-2); text-decoration: none; }
  .account-menu { display: none !important; }

  .compose-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "topbar"
      "flash"
      "list";
    height: auto;
    min-height: 100vh;
    min-height: 100dvh;
  }
}

/* ============ Phone / narrow ============ */
@media (max-width: 759px) {
  .brand-name { max-width: 42vw; }
  .btn-compose { padding-inline: 0.8rem; }
  /* Mail page: collapse nav into account menu */
  .app-shell:not(.compose-shell) .topbar-user > a,
  .app-shell:not(.compose-shell) .topbar-user > .user-email { display: none; }
  /* Admin / compose / password: keep compact text links */
  .compose-shell .topbar-user { gap: 0.15rem; }
  .compose-shell .topbar-user > a {
    padding: 0.4rem 0.45rem;
    border-radius: 8px;
    font-size: 0.85rem;
  }
  .compose-shell .topbar-user > .user-email { display: none; }

  .folder-pane {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(320px, 86vw);
    transform: translateX(-105%);
    transition: transform 0.22s ease;
    z-index: 50;
    padding-top: calc(var(--topbar-h) + var(--safe-top));
    box-shadow: var(--shadow-md);
  }
  .folder-pane-head { display: flex; }
  #nav-toggle:checked ~ .nav-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(10, 14, 22, 0.45);
    z-index: 40;
    backdrop-filter: blur(2px);
  }
  #nav-toggle:checked ~ .app-shell .folder-pane { transform: translateX(0); }

  .list-pane { display: block; }
  .detail-pane { display: none; }
  .app-shell.has-detail .list-pane { display: none; }
  .app-shell.has-detail .detail-pane { display: block; }
  .detail-header .back-link { display: inline-flex; }

  .msg-date { font-size: 0.72rem; }
  .msg-link { padding: 0.95rem 1rem; }
  .detail-toolbar .btn { min-width: calc(50% - 0.3rem); }
  .compose-main { padding-inline: 1rem; }
  .compose-form textarea { min-height: min(45vh, 280px); }
  .admin-table th:not(.dns-value),
  .admin-table td:not(.dns-value) { white-space: nowrap; }
  .admin-card { padding: 1rem; border-radius: 12px; }
  input[type="text"], input[type="email"], input[type="password"],
  input[type="number"], textarea, select { font-size: 16px; }
}

@media (min-width: 760px) {
  .compose-actions .btn { flex: 0 1 auto; }
  .detail-toolbar .btn { flex: 0 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}