:root {
  --leaf: #1F4D3A; --leaf-2: #2B6A50; --mango: #F2A93B; --mango-ink: #3A2600;
  --bg: #F6F8F7; --panel: #FFFFFF; --ink: #1C2321; --muted: #5E6B66; --line: #DCE2DE;
  --hover: #EEF3F0; --sel: #E2EDE7; --danger: #B3261E; --ok: #1E7A46; --warn: #8A5A00;
  --radius-s: 6px; --radius-m: 10px;
  --font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --leaf: #14352A; --leaf-2: #1F4D3A; --bg: #121715; --panel: #1A201E; --ink: #E7ECEA; --muted: #9AA8A2;
    --line: #2C3532; --hover: #222A27; --sel: #26352F; --danger: #F2867E; --ok: #6FD39A; --warn: #F2C26B;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { font: 15px/1.5 var(--font); color: var(--ink); background: var(--bg); -webkit-font-smoothing: antialiased; }
button, input, textarea, select { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--mango); outline-offset: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.hidden { display: none !important; }

/* Buttons & fields */
.btn { border: 1px solid var(--line); background: var(--panel); padding: .5rem .9rem; border-radius: var(--radius-s); cursor: pointer; }
.btn:hover { background: var(--hover); }
.btn.primary { background: var(--leaf); border-color: var(--leaf); color: #fff; }
.btn.primary:hover { background: var(--leaf-2); }
.btn.compose { background: var(--mango); border-color: var(--mango); color: var(--mango-ink); font-weight: 600; width: 100%; padding: .7rem; }
.btn.danger { color: var(--danger); }
.btn.link { border: 0; background: none; padding: .25rem .4rem; color: var(--muted); }
.btn[disabled] { opacity: .55; cursor: progress; }
label { display: block; font-size: .875rem; color: var(--muted); margin: .75rem 0 .25rem; }
input[type=text], input[type=email], input[type=password], input[type=number], textarea, select {
  width: 100%; padding: .6rem .7rem; border: 1px solid var(--line); border-radius: var(--radius-s); background: var(--panel);
}
textarea { min-height: 14rem; resize: vertical; }
.err { color: var(--danger); font-size: .9rem; min-height: 1.4em; margin: .5rem 0 0; }
.muted { color: var(--muted); }

/* Sign-in */
.signin { min-height: 100%; display: grid; place-items: center; padding: 1.5rem; background: var(--leaf); }
.signin-card { width: min(400px, 100%); background: var(--panel); border-radius: var(--radius-m); padding: 2rem 1.75rem; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; font-size: 1.1rem; }
.brand img { width: 28px; height: 28px; }
.signin-card h1 { font-size: 1.5rem; margin: 1.25rem 0 .25rem; }
.signin-card .btn.primary { width: 100%; margin-top: 1.25rem; padding: .7rem; }
.lang { margin-top: 1rem; text-align: center; }

/* App shell: folders | list | reader */
.shell { display: grid; grid-template-columns: 220px minmax(280px, 380px) 1fr; grid-template-rows: 56px 1fr; height: 100dvh; }
.top { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; padding: 0 1rem; background: var(--leaf); color: #fff; }
.top .btn.link { color: #DCEBE3; }
.side { border-right: 1px solid var(--line); padding: 1rem .75rem; overflow: auto; background: var(--panel); }
.folders { list-style: none; padding: 0; margin: 1rem 0 0; }
.folders button { width: 100%; display: flex; justify-content: space-between; border: 0; background: none; padding: .55rem .7rem; border-radius: var(--radius-s); cursor: pointer; text-align: left; }
.folders button:hover { background: var(--hover); }
.folders button[aria-current=true] { background: var(--sel); font-weight: 600; }
.count { color: var(--leaf-2); font-weight: 700; }
.quota { margin-top: 1.5rem; font-size: .8rem; color: var(--muted); }
.bar { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; margin-top: .3rem; }
.bar i { display: block; height: 100%; background: var(--leaf-2); }

.list { border-right: 1px solid var(--line); overflow: auto; background: var(--panel); }
.row { display: block; width: 100%; text-align: left; border: 0; border-bottom: 1px solid var(--line); background: none; padding: .7rem 1rem; cursor: pointer; }
.row:hover { background: var(--hover); }
.row[aria-current=true] { background: var(--sel); }
.row .l1 { display: flex; justify-content: space-between; gap: .5rem; }
.row .who { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row .when { color: var(--muted); font-size: .8rem; white-space: nowrap; }
.row .subj { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: .9rem; }
.row.unread .who, .row.unread .subj { font-weight: 700; color: var(--ink); }
.row.unread { box-shadow: inset 4px 0 0 var(--mango); }
.empty { padding: 2rem 1rem; color: var(--muted); }
.tag { display: inline-block; font-size: .72rem; padding: 0 .4rem; margin: 0 .35rem 0 0; border-radius: 4px; background: var(--sel); color: var(--leaf-2); font-weight: 600; vertical-align: 1px; }
.meta .tag { margin-left: .4rem; }
.group-head { margin: 1rem .7rem .2rem; font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }

.reader { display: flex; flex-direction: column; min-width: 0; background: var(--bg); }
.reader-head { padding: 1rem 1.25rem; border-bottom: 1px solid var(--line); background: var(--panel); }
.reader-head h2 { margin: 0 0 .4rem; font-size: 1.25rem; line-height: 1.3; overflow-wrap: anywhere; }
.meta { font-size: .875rem; color: var(--muted); overflow-wrap: anywhere; }
.actions { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .75rem; }
.notice { margin: .6rem 0 0; padding: .5rem .75rem; border-radius: var(--radius-s); font-size: .875rem; background: var(--hover); }
.notice.bad { color: var(--danger); border: 1px solid currentColor; background: none; }
.badges { display: inline-flex; gap: .3rem; margin-left: .4rem; }
.badge { font-size: .72rem; padding: 0 .4rem; border-radius: 4px; border: 1px solid var(--line); }
.badge.pass { color: var(--ok); border-color: currentColor; }
.badge.fail { color: var(--danger); border-color: currentColor; }
.atts { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .6rem; }
.att { font-size: .85rem; padding: .3rem .6rem; border: 1px solid var(--line); border-radius: var(--radius-s); color: var(--ink); text-decoration: none; background: var(--bg); }
.frame { flex: 1; border: 0; width: 100%; background: #fff; }
.placeholder { margin: auto; color: var(--muted); }

/* Dialogs */
dialog { border: 0; border-radius: var(--radius-m); padding: 0; width: min(680px, calc(100vw - 1.5rem)); max-height: calc(100dvh - 2rem); background: var(--panel); color: var(--ink); }
dialog::backdrop { background: rgba(10, 25, 18, .55); }
.dlg-head { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.25rem; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--panel); }
.dlg-head h2 { margin: 0; font-size: 1.1rem; }
.dlg-body { padding: .25rem 1.25rem 1.25rem; overflow: auto; }
.dlg-foot { display: flex; justify-content: flex-end; gap: .5rem; margin-top: 1rem; }
.tabs { display: flex; gap: .25rem; margin-top: .75rem; border-bottom: 1px solid var(--line); }
.tabs button { border: 0; background: none; padding: .5rem .8rem; cursor: pointer; border-bottom: 3px solid transparent; }
.tabs button[aria-selected=true] { border-color: var(--mango); font-weight: 600; }
table { width: 100%; border-collapse: collapse; font-size: .875rem; }
th, td { text-align: left; padding: .45rem .4rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.scroll-x { overflow-x: auto; }
.secret { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 1.05rem; letter-spacing: .08em; padding: .6rem; background: var(--hover); border-radius: var(--radius-s); word-break: break-all; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 .75rem; }

#toast { position: fixed; left: 50%; bottom: calc(1rem + env(safe-area-inset-bottom)); transform: translateX(-50%); background: var(--ink); color: var(--panel); padding: .6rem 1rem; border-radius: var(--radius-s); opacity: 0; pointer-events: none; transition: opacity .2s; max-width: 90vw; }
#toast.show { opacity: 1; }

/* Mobile: one pane at a time */
.back { display: none; }
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; grid-template-rows: 56px auto 1fr; }
  .side { border-right: 0; border-bottom: 1px solid var(--line); padding: .6rem .75rem; }
  .folders { display: flex; gap: .25rem; overflow-x: auto; margin-top: .6rem; }
  .folders button { white-space: nowrap; gap: .4rem; }
  .quota, .group-head { display: none; }
  .shell.reading .list, .shell.reading .side { display: none; }
  .shell:not(.reading) .reader { display: none; }
  .shell.reading { grid-template-rows: 56px 1fr; }
  .back { display: inline-block; }
  .grid2 { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }