:root {
  --page: #edf0f6;

  --surface:   #ffffff;
  --surface-2: #f4f6fb;
  --surface-3: #eceff6;

  --text:   #0f172a;
  --muted:  #64748b;
  --faint:  #94a3b8;
  --border: #e3e8f0;

  --primary:    #6366f1;
  --primary-2:  #8b5cf6;
  --primary-600:#4f46e5;
  --primary-50: #eef2ff;

  --danger:    #e11d48;
  --danger-bg: #fff1f3;
  --ok:        #16a34a;
  --ok-bg:     #f0fdf4;

  --radius:    16px;
  --radius-md: 12px;
  --radius-sm: 10px;

  --ring: 0 0 0 3px rgba(99, 102, 241, .25);

  --ease: cubic-bezier(.4, 0, .2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0d121e;

    --surface:   #141b2e;
    --surface-2: #1b2336;
    --surface-3: #232c42;

    --text:   #e7ecf5;
    --muted:  #9aa6bd;
    --faint:  #6b7896;
    --border: #2a3349;

    --primary-50: #20264a;

    --danger-bg: #2a1620;
    --ok-bg:     #122017;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body { margin: 0; padding: 0; min-height: 100%; }

body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--page);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(99, 102, 241, .25); }

a { color: var(--primary); text-decoration: none; transition: color .15s var(--ease); }
a:hover { color: var(--primary-600); }

:focus-visible { outline: none; box-shadow: var(--ring); border-radius: 8px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  transition: transform .12s var(--ease), opacity .2s, filter .15s var(--ease);
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: .6; cursor: not-allowed; transform: none; }

.btn-sm { width: auto; padding: 9px 15px; font-size: 13.5px; border-radius: 10px; }

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--surface-2); filter: none; }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
}
.btn-danger:hover { background: var(--danger-bg); transform: translateY(-1px); filter: none; }

/* ---------- forms ---------- */
input[type="text"],
input[type="password"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 11px 14px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 11px;
  outline: none;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
input::placeholder, textarea::placeholder { color: var(--faint); }
input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: var(--ring);
}
textarea { resize: vertical; line-height: 1.5; }

select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px 16px;
  padding-right: 38px;
  cursor: pointer;
}

label.field { display: block; margin-bottom: 16px; }
label.field span {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 7px;
}

.input-suffix {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: 11px;
  overflow: hidden;
  background: var(--surface);
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.input-suffix:focus-within { border-color: var(--primary); box-shadow: var(--ring); }
.input-suffix input { border: 0; border-radius: 0; }
.input-suffix input:focus { box-shadow: none; }
.input-suffix .suffix {
  display: flex;
  align-items: center;
  padding: 0 13px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 14px;
  border-left: 1px solid var(--border);
  white-space: nowrap;
}

/* ---------- alerts ---------- */
.alert {
  display: none;
  padding: 11px 14px;
  border-radius: 12px;
  font-size: 14px;
  margin-bottom: 18px;
  border: 1px solid transparent;
}
.alert.show { display: block; animation: pop .18s var(--ease); }
.alert.error { background: var(--danger-bg); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 25%, transparent); }
.alert.ok    { background: var(--ok-bg);     color: var(--ok);     border-color: color-mix(in srgb, var(--ok) 25%, transparent); }

@keyframes pop { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

/* ---------- auth pages ---------- */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.card {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 38px 34px;
  animation: rise .35s var(--ease);
}
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

.brand { display: flex; align-items: center; gap: 11px; margin-bottom: 4px; }
.brand .logo {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 19px;
}
.brand h1 { font-size: 21px; margin: 0; letter-spacing: -.4px; font-weight: 700; }

.subtitle { color: var(--muted); font-size: 14.5px; margin: 8px 0 26px; }

.foot { margin-top: 22px; text-align: center; font-size: 14px; color: var(--muted); }

/* ---------- topbar ---------- */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 13px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.topbar .brand h1 { font-size: 18px; }
.topbar .brand .logo { width: 32px; height: 32px; font-size: 16px; }
.who { font-size: 13.5px; color: var(--muted); }
.who strong { color: var(--text); }

.nav { display: flex; gap: 4px; }
.nav a {
  padding: 7px 13px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}
.nav a:hover { background: var(--surface-2); color: var(--text); }
.nav a.active { background: var(--primary-50); color: var(--primary-600); font-weight: 600; }

/* ---------- containers / panels ---------- */
.container { max-width: 760px; margin: 0 auto; padding: 30px 20px 70px; }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  margin-bottom: 20px;
}
.panel h2 { font-size: 17px; margin: 0 0 4px; letter-spacing: -.2px; }
.panel .hint { font-size: 13px; color: var(--muted); margin: 0 0 18px; }

.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.row .grow { flex: 1 1 200px; }

/* ---------- address list ---------- */
.addr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 10px;
  transition: border-color .15s var(--ease);
}
.addr:last-child { margin-bottom: 0; }
.addr:hover { border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.addr .meta { min-width: 0; }
.addr .email { font-weight: 600; font-size: 15px; word-break: break-all; }
.addr .sub { font-size: 12px; color: var(--muted); margin-top: 3px; }
.addr .email.copyable { cursor: pointer; transition: color .12s var(--ease); }
.addr .email.copyable:hover { color: var(--primary); }

.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: 3px 9px;
  border-radius: 999px;
  margin-bottom: 6px;
}
.tag.perm   { background: var(--primary-50); color: var(--primary-600); }
.tag.random { background: #ecfdf5; color: #047857; }
.tag.temp   { background: #fff7ed; color: #c2410c; }
.tag.main   { background: #ecfeff; color: #0e7490; }
.tag.role   { background: #f5f3ff; color: #6d28d9; }
@media (prefers-color-scheme: dark) {
  .tag.random { background: #0c2a1e; color: #34d399; }
  .tag.temp   { background: #2a1c0e; color: #fb923c; }
  .tag.main   { background: #0c252b; color: #22d3ee; }
  .tag.role   { background: #211a3d; color: #c4b5fd; }
}

.addr .label-input {
  width: 100%;
  border: 0;
  background: transparent;
  padding: 2px 7px;
  margin: 0 0 3px -7px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  border-radius: 7px;
  transition: background .12s var(--ease);
}
.addr .label-input::placeholder { color: var(--faint); font-weight: 500; }
.addr .label-input:hover  { background: var(--surface-2); }
.addr .label-input:focus  { background: var(--surface-2); outline: none; box-shadow: none; }

.empty { text-align: center; color: var(--muted); font-size: 14px; padding: 30px 0; }
.spinner { text-align: center; color: var(--muted); font-size: 14px; padding: 22px 0; }
.spinner::after {
  content: "";
  display: inline-block;
  width: 16px; height: 16px;
  margin-left: 8px;
  vertical-align: -3px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- webmail layout ---------- */
.mail-app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 22px 20px 70px;
  display: flex;
  gap: 22px;
  align-items: flex-start;
}
.sidebar { flex: 0 0 230px; position: sticky; top: 82px; }
.sidebar .sidebar-select { width: 100%; margin-bottom: 10px; }
.sidebar .compose-btn { width: 100%; margin-bottom: 14px; }
.folders {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
}
.folder-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 11px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
  user-select: none;
  transition: background .12s var(--ease), color .12s var(--ease);
}
.folder-item:hover { background: var(--surface-2); }
.folder-item.active { background: var(--primary-50); color: var(--primary-600); font-weight: 600; }
.folder-item .ficon { width: 18px; text-align: center; }
.folder-item .fname { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.mail-main { flex: 1 1 auto; min-width: 0; }

.mail-toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.mail-toolbar .spacer { flex: 1 1 auto; }

.mrow {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 13px 14px;
  border: 1px solid transparent;
  border-bottom-color: var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: background .12s var(--ease), border-color .12s var(--ease);
}
.mrow:hover { background: var(--surface-2); border-color: var(--border); }
.mrow.unread { position: relative; }
.mrow.unread::before {
  content: "";
  position: absolute;
  left: -2px; top: 50%;
  width: 7px; height: 7px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--primary);
}
.mrow .mfrom { flex: 0 0 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 500; }
.mrow.unread .mfrom, .mrow.unread .msubj { font-weight: 700; }
.mrow .msubj { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text); }
.mrow .mdate { flex: 0 0 auto; color: var(--muted); font-size: 12px; }

.pager { display: flex; gap: 10px; align-items: center; margin-top: 14px; }
.pager .info { color: var(--muted); font-size: 13px; }

.msg-head { border-bottom: 1px solid var(--border); padding-bottom: 14px; margin-bottom: 16px; }
.msg-subject { font-size: 20px; font-weight: 700; margin: 0 0 10px; letter-spacing: -.3px; }
.msg-meta { font-size: 13px; color: var(--muted); line-height: 1.7; }
.msg-meta b { color: var(--text); font-weight: 600; }
.msg-body { font-size: 14.5px; line-height: 1.6; white-space: pre-wrap; word-wrap: break-word; }
.msg-frame { width: 100%; border: 0; min-height: 340px; background: #fff; border-radius: 10px; }
.attach {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 8px 8px 0 0;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
  background: var(--surface);
  color: var(--text);
  transition: background .12s var(--ease), border-color .12s var(--ease);
}
.attach:hover { background: var(--surface-2); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }

/* ---------- toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%) translateY(20px);
  background: #0f172a;
  color: #fff;
  padding: 11px 20px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, .12);
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s var(--ease), transform .22s var(--ease);
  z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .mail-app {
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 14px;
  }
  .sidebar {
    position: static;
    flex-basis: auto;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
  }
  .sidebar .sidebar-select { width: auto; flex: 1 1 180px; margin: 0; }
  .sidebar .compose-btn { width: auto; flex: 0 0 auto; margin: 0; }
  .folders { flex: 1 1 100%; display: flex; flex-wrap: wrap; gap: 4px; }
  .folder-item { flex: 0 0 auto; }
  .mail-main { width: 100%; }
}

@media (max-width: 600px) {
  .topbar-inner { padding: 11px 16px; }
  .who { display: none; }
  .container { padding: 20px 14px 60px; }
  .panel { padding: 20px 18px; }
  .card { padding: 30px 22px; }
  .addr { flex-direction: column; align-items: stretch; }
  .addr .actions { display: flex; justify-content: flex-end; }
  .mrow { flex-direction: column; gap: 3px; }
  .mrow .mfrom { flex-basis: auto; }
  .mrow .mdate { order: 3; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}