/* ============================================================ tokens == */
:root {
  color-scheme: light;
  --bg: #f2f4f7;
  --surface: #ffffff;
  --surface-2: #f7f8fa;
  --surface-hover: #f1f3f7;
  --line: #e5e8ee;
  --line-soft: #eef0f4;
  --fg: #111721;
  --fg-2: #48525f;
  --muted: #7a8493;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-fg: #ffffff;
  --accent-soft: #eef0ff;
  --accent-line: #d5d9fb;
  --danger: #b42318;
  --danger-soft: #fef3f2;
  --danger-line: #fbcdc7;
  --warn-soft: #fff5e6;
  --warn-line: #ffdfb0;
  --warn-fg: #96560b;
  --shadow-sm: 0 1px 2px rgb(16 24 40 / .05);
  --shadow: 0 1px 3px rgb(16 24 40 / .07), 0 8px 24px -12px rgb(16 24 40 / .18);
  --r-sm: 8px; --r: 12px; --r-lg: 16px; --r-full: 999px;
  --nav-h: 60px;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0c0f14;
    --surface: #141922;
    --surface-2: #1a202a;
    --surface-hover: #1d242f;
    --line: #262d39;
    --line-soft: #1e242e;
    --fg: #e9edf3;
    --fg-2: #a9b3c1;
    --muted: #78838f;
    --accent: #8189ff;
    --accent-hover: #9aa1ff;
    --accent-fg: #0c0f14;
    --accent-soft: #1a1f33;
    --accent-line: #2c3352;
    --danger: #ff9d92;
    --danger-soft: #2a1614;
    --danger-line: #4d2621;
    --warn-soft: #2a2113;
    --warn-line: #4b3a1a;
    --warn-fg: #f0c07a;
    --shadow-sm: 0 1px 2px rgb(0 0 0 / .4);
    --shadow: 0 1px 3px rgb(0 0 0 / .5), 0 12px 28px -14px rgb(0 0 0 / .8);
  }
}

/* ============================================================== base == */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:where(a, button, input, textarea, summary):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}
h1 { font-size: 1.35rem; line-height: 1.3; margin: 0 0 4px; letter-spacing: -.01em; }
h2 { font-size: 1rem; margin: 0 0 12px; letter-spacing: -.005em; }
.icon { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor;
  stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.muted { color: var(--muted); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 12px; top: 12px; z-index: 20; background: var(--surface);
  padding: 10px 14px; border-radius: var(--r-sm); box-shadow: var(--shadow); }

/* ============================================================ app bar == */
.appbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.appbar-inner {
  max-width: 1000px; margin: 0 auto; min-height: var(--nav-h);
  display: flex; align-items: center; gap: 10px; padding: 8px 16px;
}
.brand { display: flex; align-items: center; gap: 9px; color: var(--fg);
  font-weight: 650; letter-spacing: -.01em; margin-right: 6px; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 9px; flex: none;
  display: grid; place-items: center;
  background: linear-gradient(140deg, var(--accent), #a855f7);
  color: #fff; box-shadow: var(--shadow-sm);
}
.brand-mark .icon { width: 16px; stroke-width: 2; }
.brand-name { font-size: 14px; }
.tabs { display: flex; align-items: center; gap: 2px; }
.tab {
  display: flex; align-items: center; gap: 7px;
  padding: 7px 11px; border-radius: var(--r-sm);
  color: var(--fg-2); font-size: 14px; font-weight: 500;
}
.tab:hover { background: var(--surface-hover); color: var(--fg); text-decoration: none; }
.tab.is-active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.tab .icon { width: 17px; }
.badge {
  min-width: 19px; padding: 0 6px; border-radius: var(--r-full);
  background: var(--accent); color: var(--accent-fg);
  font-size: 11px; font-weight: 700; line-height: 19px; text-align: center;
}
.tab.is-active .badge { background: var(--accent); color: var(--accent-fg); }
.spacer { flex: 1; }

.usermenu { position: relative; }
.usermenu > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 8px;
  padding: 5px 9px 5px 5px; border-radius: var(--r-full); color: var(--fg-2);
  font-size: 13px; border: 1px solid transparent;
}
.usermenu > summary::-webkit-details-marker { display: none; }
.usermenu > summary:hover { background: var(--surface-hover); border-color: var(--line); }
.usermenu[open] > summary { background: var(--surface-hover); border-color: var(--line); }
.usermenu-panel {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 220px; z-index: 20;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  box-shadow: var(--shadow); padding: 6px; animation: pop .12s ease-out;
}
.usermenu-panel .who { padding: 8px 10px 10px; border-bottom: 1px solid var(--line-soft);
  margin-bottom: 6px; }
.usermenu-panel .who b { display: block; font-size: 13px; word-break: break-all; }
.usermenu-panel a {
  display: flex; align-items: center; gap: 9px; padding: 8px 10px;
  border-radius: var(--r-sm); color: var(--fg-2); font-size: 14px;
}
.usermenu-panel a:hover { background: var(--surface-hover); color: var(--fg); text-decoration: none; }
@keyframes pop { from { opacity: 0; transform: translateY(-4px); } }

/* ============================================================ buttons == */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 15px; border-radius: var(--r-sm); border: 1px solid transparent;
  font: inherit; font-size: 14px; font-weight: 600; cursor: pointer;
  background: var(--surface-2); color: var(--fg-2); border-color: var(--line);
  transition: background .12s, border-color .12s, color .12s, transform .06s;
}
.btn:hover { background: var(--surface-hover); color: var(--fg); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover);
  color: var(--accent-fg); }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-ghost:hover { background: var(--surface-hover); }
.btn-sm { padding: 6px 11px; font-size: 13px; }
.btn[disabled] { opacity: .65; cursor: progress; }
.btn .icon { width: 16px; }
.btn.is-busy .icon { animation: spin .9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
button { font: inherit; }

/* ============================================================= layout == */
main { max-width: 1000px; margin: 26px auto 64px; padding: 0 16px; }
.page-head { display: flex; align-items: flex-end; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.page-head .sub { color: var(--muted); font-size: 13px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm); margin-bottom: 18px; overflow: hidden;
}
.card-pad { padding: 22px; }
.card-foot { padding: 14px 22px; background: var(--surface-2);
  border-top: 1px solid var(--line-soft); display: flex; align-items: center;
  gap: 10px; flex-wrap: wrap; }
.alert {
  display: flex; align-items: center; gap: 10px; margin-bottom: 16px;
  background: var(--danger-soft); color: var(--danger);
  border: 1px solid var(--danger-line); border-radius: var(--r); padding: 11px 14px;
  font-size: 14px;
}

/* ============================================================== forms == */
.field { display: block; margin-bottom: 16px; }
.field > .label { display: block; font-size: 12px; font-weight: 650; color: var(--fg-2);
  letter-spacing: .02em; text-transform: uppercase; margin-bottom: 6px; }
input, textarea {
  width: 100%; padding: 10px 12px; font: inherit; color: var(--fg);
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--r-sm); transition: border-color .12s, box-shadow .12s, background .12s;
}
input::placeholder, textarea::placeholder { color: var(--muted); }
input:focus, textarea:focus {
  outline: none; background: var(--surface); border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
textarea { resize: vertical; min-height: 120px; line-height: 1.6; }
.hint { font-size: 12px; color: var(--muted); margin-top: 6px; }
.addr-row { display: flex; align-items: center; gap: 0; }
.addr-row input { border-radius: var(--r-sm) 0 0 var(--r-sm); }
.addr-row .at {
  padding: 10px 12px; color: var(--muted); font-size: 14px; white-space: nowrap;
  background: var(--surface-hover); border: 1px solid var(--line); border-left: 0;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

/* =========================================================== maillist == */
.toolbar { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.seg { display: inline-flex; padding: 3px; gap: 2px; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--r); }
.seg a { display: flex; align-items: center; gap: 7px; padding: 6px 12px;
  border-radius: var(--r-sm); font-size: 13.5px; font-weight: 550; color: var(--fg-2); }
.seg a:hover { background: var(--surface-hover); text-decoration: none; }
.seg a.is-active { background: var(--accent-soft); color: var(--accent); }

.maillist { list-style: none; margin: 0; padding: 0; }
.maillist > li + li { border-top: 1px solid var(--line-soft); }
.mailrow {
  display: flex; gap: 13px; padding: 14px 18px; color: inherit; align-items: flex-start;
  transition: background .1s;
}
.mailrow:hover { background: var(--surface-hover); text-decoration: none; }
.avatar {
  width: 38px; height: 38px; flex: none; border-radius: var(--r-full);
  display: grid; place-items: center; font-size: 13px; font-weight: 700;
  letter-spacing: .01em;
  color: hsl(var(--h) 62% 34%);
  background: hsl(var(--h) 72% 92%);
  box-shadow: inset 0 0 0 1px hsl(var(--h) 55% 84%);
}
@media (prefers-color-scheme: dark) {
  .avatar { color: hsl(var(--h) 70% 78%); background: hsl(var(--h) 40% 20%);
    box-shadow: inset 0 0 0 1px hsl(var(--h) 35% 30%); }
}
.mailrow .main { min-width: 0; flex: 1; }
.line-1 { display: flex; align-items: baseline; gap: 10px; }
.line-1 .who { font-weight: 600; color: var(--fg); font-size: 14.5px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.line-1 .when { margin-left: auto; flex: none; color: var(--muted); font-size: 12px;
  font-variant-numeric: tabular-nums; }
.line-2 { display: flex; align-items: center; gap: 8px; margin-top: 1px; }
.line-2 .subject { font-size: 14.5px; color: var(--fg-2);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.preview { display: block; margin-top: 3px; color: var(--muted); font-size: 13px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dot { width: 8px; height: 8px; border-radius: var(--r-full); flex: none;
  background: var(--accent); margin-top: 15px; }
.dot.is-hidden { background: transparent; }
.is-unread .line-1 .who { font-weight: 750; }
.is-unread .line-2 .subject { color: var(--fg); font-weight: 600; }

.chip { flex: none; font-size: 10.5px; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; padding: 2px 7px; border-radius: var(--r-full);
  border: 1px solid transparent; }
.chip.high { background: var(--danger-soft); color: var(--danger); border-color: var(--danger-line); }
.chip.low { background: var(--surface-2); color: var(--muted); border-color: var(--line); }
.chip.ai { background: var(--accent-soft); color: var(--accent); border-color: var(--accent-line); }

.maillist > li { position: relative; }
.rowacts {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  display: flex; gap: 2px; padding: 3px; border-radius: var(--r);
  background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  opacity: 0; pointer-events: none; transition: opacity .12s;
}
.maillist > li:hover .rowacts,
.rowacts:focus-within { opacity: 1; pointer-events: auto; }
.iconbtn {
  display: grid; place-items: center; width: 30px; height: 30px; padding: 0;
  border: 0; border-radius: var(--r-sm); background: transparent;
  color: var(--muted); cursor: pointer; transition: background .12s, color .12s;
}
.iconbtn:hover { background: var(--surface-hover); color: var(--fg); text-decoration: none; }
.iconbtn.danger:hover { background: var(--danger-soft); color: var(--danger); }
.iconbtn .icon { width: 17px; }
@media (hover: none) {
  .rowacts { opacity: 1; pointer-events: auto; position: static; transform: none;
    background: transparent; border: 0; box-shadow: none; }
  .maillist > li { display: flex; align-items: center; }
  .maillist > li > .mailrow { flex: 1; min-width: 0; }
}

.searchbar {
  display: flex; align-items: center; gap: 8px; padding: 0 10px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  min-width: 240px; transition: border-color .12s, box-shadow .12s;
}
.searchbar:focus-within { border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.searchbar > .icon { color: var(--muted); }
.searchbar input { border: 0; background: none; padding: 9px 0; }
.searchbar input:focus { outline: none; box-shadow: none; background: none; }
.searchbar .iconbtn { width: 24px; height: 24px; }

.btn-danger { background: var(--danger-soft); color: var(--danger); border-color: var(--danger-line); }
.btn-danger:hover { background: var(--danger); color: var(--surface); border-color: var(--danger); }
.trash-foot { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.banner {
  display: flex; align-items: center; gap: 9px; padding: 11px 22px; font-size: 13.5px;
  background: var(--warn-soft); color: var(--warn-fg); border-bottom: 1px solid var(--warn-line);
}
.msg-nav { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.msg-nav .backlink { margin-bottom: 0; }
.msg-who { min-width: 0; }
.form-actions { margin-top: 14px; }
.field-last { margin-bottom: 0; }
.card-pad.tight { padding-top: 0; }
.ai-bar.plain { border-top: 0; background: transparent; padding: 18px 22px; }
.who-label { display: block; font-size: 12px; color: var(--muted); }
.menu-item {
  display: flex; align-items: center; gap: 9px; width: 100%; padding: 8px 10px;
  border: 0; border-radius: var(--r-sm); background: none; color: var(--fg-2);
  font: inherit; font-size: 14px; text-align: left; cursor: pointer;
}
.menu-item:hover { background: var(--surface-hover); color: var(--fg); }

.empty { text-align: center; padding: 56px 24px; color: var(--muted); }
.empty .icon { width: 42px; height: 42px; stroke-width: 1.2; margin-bottom: 12px;
  color: var(--muted); opacity: .45; }
.empty p { margin: 0 0 4px; color: var(--fg-2); font-weight: 600; }
.empty span { font-size: 13.5px; }


/* 16 stable palette slots; the server picks one by hashing the address. */
.hue-0 { --h: 12; }
.hue-1 { --h: 35; }
.hue-2 { --h: 58; }
.hue-3 { --h: 81; }
.hue-4 { --h: 104; }
.hue-5 { --h: 127; }
.hue-6 { --h: 150; }
.hue-7 { --h: 173; }
.hue-8 { --h: 196; }
.hue-9 { --h: 219; }
.hue-10 { --h: 242; }
.hue-11 { --h: 265; }
.hue-12 { --h: 288; }
.hue-13 { --h: 311; }
.hue-14 { --h: 334; }
.hue-15 { --h: 357; }
.avatar-sm { width: 28px; height: 28px; font-size: 11px; }

/* ============================================================ message == */
.backlink { display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px;
  color: var(--muted); margin-bottom: 12px; }
.backlink:hover { color: var(--fg); text-decoration: none; }
.msg-head { display: flex; gap: 14px; padding: 22px 22px 18px; align-items: flex-start; }
.msg-head .avatar { width: 44px; height: 44px; font-size: 14px; }
.msg-head .who { font-weight: 650; }
.msg-head .addr { color: var(--muted); font-size: 13px; word-break: break-all; }
.msg-head .when { margin-left: auto; text-align: right; color: var(--muted);
  font-size: 12.5px; flex: none; }
.msg-title { display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 0 22px 14px; }
.msg-body {
  padding: 20px 22px 26px; margin: 0; border-top: 1px solid var(--line-soft);
  white-space: pre-wrap; overflow-wrap: anywhere;
  font: inherit; font-size: 14.5px; line-height: 1.7; color: var(--fg-2);
}

/* ================================================================= ai == */
.ai-bar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
  padding: 14px 22px; background: var(--surface-2); border-top: 1px solid var(--line-soft); }
.ai-bar input { flex: 1; min-width: 190px; width: auto; background: var(--surface); }
.ai-box {
  margin: 0; padding: 16px 22px; background: var(--accent-soft);
  border-top: 1px solid var(--accent-line);
  white-space: pre-wrap; overflow-wrap: anywhere; font-size: 14.5px; line-height: 1.65;
}
.ai-box .ai-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px;
  font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--accent); }
.ai-box .ai-head .icon { width: 14px; }
.ai-box .ai-text { display: block; color: var(--fg); }
.ai-box.is-error { background: var(--danger-soft); border-color: var(--danger-line); }
.ai-box.is-error .ai-head { color: var(--danger); }
.ai-box[hidden] { display: none; }
.icon.inline { vertical-align: -3px; width: 16px; color: var(--accent); }
.hint-top { margin-top: -6px; margin-bottom: 10px; }
.ai-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.field-flash {
  animation: flash 1.1s ease-out;
}
@keyframes flash {
  from { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent); }
}
.chips-title { display: block; font-size: 12px; font-weight: 650; color: var(--muted);
  letter-spacing: .02em; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chips button {
  background: var(--surface-2); border: 1px solid var(--line); color: var(--fg-2);
  padding: 7px 12px; border-radius: var(--r-full); font-size: 13px; cursor: pointer;
  text-align: left; transition: background .12s, border-color .12s;
}
.chips button:hover { background: var(--accent-soft); border-color: var(--accent-line);
  color: var(--accent); }

/* =============================================================== auth == */
.auth { max-width: 400px; margin: 8vh auto 0; }
.auth-brand { display: flex; flex-direction: column; align-items: center; gap: 10px;
  margin-bottom: 22px; text-align: center; }
.auth-brand .brand-mark { width: 44px; height: 44px; border-radius: 14px; }
.auth-brand .brand-mark .icon { width: 24px; }
.auth-brand h1 { margin: 6px 0 0; font-size: 1.3rem; }
.auth-brand p { margin: 2px 0 0; color: var(--muted); font-size: 13.5px; }
.auth .btn { width: 100%; }
.auth-alt { text-align: center; font-size: 13.5px; color: var(--muted); margin: 16px 0 0; }

/* ========================================================= responsive == */
@media (max-width: 720px) {
  .appbar-inner { flex-wrap: wrap; row-gap: 6px; padding: 8px 12px; }
  .tabs { order: 3; width: 100%; overflow-x: auto; padding-bottom: 2px; }
  .brand-name { display: none; }
  .tab .label { display: inline; }
  main { margin-top: 18px; padding: 0 12px; }
  .card-pad, .msg-head, .msg-title, .msg-body, .ai-bar, .ai-box { padding-left: 16px; padding-right: 16px; }
  .mailrow { padding: 13px 14px; }
  .preview { display: none; }
  .msg-head .when { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}