/* IBTech MCP Hub: one hand-written stylesheet, no framework. Light and dark follow the system. */
@view-transition { navigation: auto; }

:root {
  color-scheme: light dark;
  --bg: light-dark(#f6f6f3, #0d0e10);
  --surface: light-dark(#ffffff, #15171a);
  --surface-2: light-dark(#f0f0ec, #1c1f23);
  --line: light-dark(#e3e3dd, #2a2d33);
  --line-strong: light-dark(#cfcfc7, #3a3e46);
  --text: light-dark(#17181a, #ececee);
  --muted: light-dark(#5d626a, #9aa0aa);
  --accent: light-dark(#2342c4, #8aa4ff);
  --accent-soft: light-dark(#e9edfc, #1b2442);
  --on-accent: light-dark(#ffffff, #0a1030);
  --ok: light-dark(#17724a, #5fd39a);
  --ok-soft: light-dark(#e4f4ec, #12281e);
  --warn: light-dark(#9a5b00, #f0b45a);
  --warn-soft: light-dark(#fdf1dc, #2d2210);
  --danger: light-dark(#b3261e, #ff8a80);
  --danger-soft: light-dark(#fce9e7, #301614);
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px light-dark(rgb(20 20 20 / 6%), rgb(0 0 0 / 40%)), 0 8px 24px -12px light-dark(rgb(20 20 20 / 14%), rgb(0 0 0 / 60%));
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI Variable", "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); min-height: 100dvh; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; margin: 0; }
h1 { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.2rem); font-weight: 650; }
h2 { font-size: 1.15rem; font-weight: 620; }
h3 { font-size: 1.05rem; font-weight: 700; }
p { margin: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
code { font-family: var(--mono); font-size: .86em; background: var(--surface-2); padding: .12em .45em; border-radius: 6px; overflow-wrap: anywhere; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.stack { display: grid; gap: 1rem; }
.row { display: flex; gap: .75rem; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.input-copy { display: flex; gap: .5rem; align-items: center; }
.input-copy input { flex: 1; min-width: 0; width: auto; }
.input-copy .btn { flex: none; }

/* Layout */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--line);
  & .inner { max-width: 72rem; margin-inline: auto; padding: .7rem 1.25rem; display: flex; align-items: center; gap: 1.25rem; }
  & nav { display: flex; gap: .25rem; }
  & nav a { color: var(--muted); padding: .4rem .75rem; border-radius: 999px; font-weight: 500; font-size: .94rem; }
  & nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
  & nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); }
}
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--text); font-weight: 650; letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.brand .mark { width: 1.7rem; height: 1.7rem; }
.container { max-width: 72rem; margin-inline: auto; padding: 2rem 1.25rem 4rem; }
.page-head { display: flex; align-items: flex-end; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.75rem; }
.page-head p { margin-top: .35rem; }
.crumbs { font-size: .9rem; color: var(--muted); margin-bottom: .6rem; }

/* Surfaces */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.35rem; box-shadow: var(--shadow); }
.card > h2 + p, .card > h3 + p { margin-top: .35rem; }
.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(min(100%, 21rem), 1fr)); }
.grid-2 { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr)); align-items: start; }
.connector { display: grid; gap: .8rem; align-content: start; & h2 { font-size: 1.1rem; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; } }
.connector .actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .25rem; }
.empty { text-align: center; padding: 3.5rem 1.5rem; display: grid; gap: .6rem; justify-items: center; }
.hero { padding: clamp(2rem, 6vw, 4.5rem) 0 2rem; display: grid; gap: 1.25rem; max-width: 46rem; }
.hero h1 { font-size: clamp(2rem, 1.2rem + 3.4vw, 3.4rem); font-weight: 700; letter-spacing: -.03em; text-wrap: balance; }
.hero p { font-size: 1.15rem; color: var(--muted); text-wrap: pretty; }
.features { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); margin-top: 1.5rem; }
.features .card { box-shadow: none; }
.url { display: flex; align-items: center; gap: .5rem; background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: .3rem .3rem .3rem .75rem; min-width: 0; }
.url code { background: none; padding: 0; flex: 1; min-width: 0; font-size: .85rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Buttons */
.btn {
  --_bg: var(--surface); --_fg: var(--text); --_bd: var(--line-strong);
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  font: inherit; font-weight: 560; font-size: .94rem; cursor: pointer;
  padding: .55rem 1rem; border-radius: var(--radius-sm); border: 1px solid var(--_bd);
  background: var(--_bg); color: var(--_fg); text-decoration: none; line-height: 1.2;
  transition: background-color .15s, border-color .15s, transform .05s;
  &:hover { background: color-mix(in srgb, var(--_bg) 90%, var(--text)); text-decoration: none; }
  &:active { transform: translateY(1px); }
  &:disabled, &[aria-busy="true"] { opacity: .6; cursor: progress; }
  &.primary { --_bg: var(--accent); --_fg: var(--on-accent); --_bd: var(--accent); }
  &.primary:hover { background: color-mix(in srgb, var(--accent) 88%, var(--text)); }
  &.danger { --_bg: var(--danger); --_fg: #fff; --_bd: var(--danger); }
  &.ghost { --_bg: transparent; --_bd: transparent; }
  &.ghost:hover { background: var(--surface-2); }
  &.ghost.danger { --_fg: var(--danger); }
  &.sm { padding: .35rem .7rem; font-size: .86rem; }
  &.lg { padding: .75rem 1.4rem; font-size: 1.02rem; }
}

/* Status */
.pill { display: inline-flex; align-items: center; gap: .4rem; font-size: .8rem; font-weight: 600; padding: .15rem .6rem; border-radius: 999px; background: var(--surface-2); color: var(--muted); white-space: nowrap; }
.pill::before { content: ""; width: .45rem; height: .45rem; border-radius: 50%; background: currentColor; }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.off { background: var(--surface-2); color: var(--muted); }
.alert { padding: .8rem 1rem; border-radius: var(--radius-sm); border: 1px solid var(--line); background: var(--surface-2); font-size: .94rem; }
.alert.ok { background: var(--ok-soft); border-color: color-mix(in srgb, var(--ok) 35%, transparent); color: var(--ok); }
.alert.warn { background: var(--warn-soft); border-color: color-mix(in srgb, var(--warn) 35%, transparent); color: var(--warn); }
.alert.error { background: var(--danger-soft); border-color: color-mix(in srgb, var(--danger) 35%, transparent); color: var(--danger); }
.alert.info { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 30%, transparent); color: var(--text); }
.flash { max-width: 72rem; margin: 1rem auto 0; padding-inline: 1.25rem; }
.flash .alert.ok { animation: fade-out .5s 6s forwards; }
@keyframes fade-out { to { opacity: 0; max-height: 0; padding-block: 0; margin: 0; border-width: 0; overflow: hidden; } }

/* Tabs */
.tabs { display: flex; gap: .25rem; border-bottom: 1px solid var(--line); margin-bottom: 1.5rem; overflow-x: auto; scrollbar-width: none; }
.tab { padding: .7rem 1rem; color: var(--muted); font-weight: 560; border-bottom: 2px solid transparent; margin-bottom: -1px; white-space: nowrap; }
.tab:hover { color: var(--text); text-decoration: none; }
.tab.active { color: var(--text); border-bottom-color: var(--accent); }

/* Forms */
.field { display: grid; gap: .35rem; align-content: start; font-size: .9rem; font-weight: 560; }
.field > span { color: var(--text); }
.field .help, .help { font-weight: 400; color: var(--muted); font-size: .84rem; }
input:not([type="checkbox"], [type="radio"]), select, textarea {
  font: inherit; font-weight: 400; color: var(--text); background: var(--surface);
  border: 1px solid var(--line-strong); border-radius: var(--radius-sm); padding: .55rem .75rem; width: 100%;
  transition: border-color .15s, box-shadow .15s;
  &:hover { border-color: color-mix(in srgb, var(--line-strong) 60%, var(--text)); }
  &:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent); }
}
textarea { resize: vertical; min-height: 5rem; }
.fields { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
.fields .wide { grid-column: 1 / -1; }
.toggles { display: grid; gap: .9rem; }
.toggles + .fields { margin-top: 1.25rem; }
.toggles .help { margin: .15rem 0 0 3.2rem; }
legend.field { padding: 0; margin-bottom: .5rem; }
td.num, th.num { text-align: right; white-space: nowrap; }
td.limit input { width: 7.5rem; }
fieldset { border: 0; padding: 0; margin: 0; display: grid; gap: 1rem; }
.section-title { font-size: 1.1rem; margin: 1.75rem 0 1rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.section-title.first { margin-top: 0; padding-top: 0; border-top: 0; }
.mt { margin-top: 1rem; }
.mb { margin-bottom: 1rem; }
.narrow { max-width: 24rem; }
.page-head .stack { gap: .6rem; }
details.reveal > summary { list-style: none; width: fit-content; cursor: pointer; }
details.reveal > summary::-webkit-details-marker { display: none; }
.mt-lg { margin-top: 1.75rem; }
.switch-row { display: flex; align-items: center; gap: .7rem; font-weight: 560; cursor: pointer; }
input.switch {
  appearance: none; flex: none; width: 2.5rem; height: 1.45rem; border-radius: 999px; margin: 0; cursor: pointer;
  background: var(--line-strong); position: relative; transition: background-color .2s;
  &::after { content: ""; position: absolute; top: .17rem; left: .17rem; width: 1.11rem; height: 1.11rem; border-radius: 50%; background: #fff; transition: transform .2s; box-shadow: 0 1px 3px rgb(0 0 0 / 30%); }
  &:checked { background: var(--accent); }
  &:checked::after { transform: translateX(1.05rem); }
}
.check { display: flex; align-items: center; gap: .5rem; font-weight: 450; }
.check input { accent-color: var(--accent); width: 1.05rem; height: 1.05rem; margin: 0; }
.checks { display: flex; flex-wrap: wrap; gap: .4rem 1.25rem; }
/* Show SMTP details only when sending is enabled, without JavaScript. */
form:not(:has(input[type="checkbox"][name$="SmtpEnabled"]:checked)) .smtp-fields { display: none; }
form:not(:has(input[type="checkbox"][name$="SmtpSeparateCredentials"]:checked)) .smtp-separate { display: none; }

/* Presets and choices */
.choice { display: grid; gap: .5rem; align-content: start; color: inherit; transition: border-color .15s, transform .15s; }
a.choice:hover { text-decoration: none; border-color: var(--accent); transform: translateY(-2px); }
.choice[aria-disabled="true"] { opacity: .55; pointer-events: none; }
.radio-card { display: flex; gap: .75rem; align-items: flex-start; padding: .9rem 1rem; border: 1px solid var(--line); border-radius: var(--radius-sm); cursor: pointer; }
.radio-card:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.radio-card input { margin-top: .3rem; accent-color: var(--accent); }

/* Capabilities */
details.cap { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
details.cap + details.cap { margin-top: .6rem; }
details.cap > summary { list-style: none; cursor: pointer; padding: 1rem 1.25rem; display: flex; align-items: center; gap: .9rem; }
details.cap > summary::-webkit-details-marker { display: none; }
details.cap > summary::after { content: ""; width: .55rem; height: .55rem; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); transition: transform .2s; margin-left: .25rem; }
details.cap[open] > summary::after { transform: rotate(-135deg); }
details.cap[open] > summary { border-bottom: 1px solid var(--line); }
details.cap .body { padding: 1.25rem; display: grid; gap: 1.1rem; }
.preview { background: var(--surface-2); border: 1px dashed var(--line-strong); border-radius: var(--radius-sm); padding: .85rem 1rem; font-size: .88rem; white-space: pre-wrap; }
.preview .label { display: block; font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: .3rem; }

/* Tables and lists */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th { text-align: left; font-weight: 600; color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; }
th, td { padding: .6rem .75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
.list-row { display: flex; align-items: center; gap: 1rem; padding: .75rem 0; }
.list-row + .list-row { border-top: 1px solid var(--line); }
ol.steps { padding-left: 1.2rem; margin: .75rem 0 1.25rem; display: grid; gap: .4rem; }
.danger-zone { border-color: color-mix(in srgb, var(--danger) 40%, var(--line)); }

/* Standalone pages: sign-in picker, consent */
body.bare { display: grid; place-items: center; padding: 1.5rem; }
.auth-card { width: min(100%, 34rem); background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: clamp(1.4rem, 5vw, 2.2rem); box-shadow: var(--shadow); display: grid; gap: 1.2rem; }
.auth-card h1 { font-size: 1.45rem; font-weight: 600; }
.auth-card dl { display: grid; grid-template-columns: 8rem 1fr; gap: .6rem 1rem; margin: 0; font-size: .94rem; }
.auth-card dt { color: var(--muted); }
.auth-card dd { margin: 0; overflow-wrap: anywhere; }
.auth-card .actions { display: flex; justify-content: flex-end; gap: .75rem; margin-top: .5rem; }
.account { display: grid; gap: .15rem; padding: .9rem 1rem; border: 1px solid var(--line); border-radius: var(--radius-sm); color: inherit; transition: border-color .15s, background-color .15s; }
.account:hover { border-color: var(--accent); background: var(--accent-soft); text-decoration: none; }
.account span { color: var(--muted); font-size: .9rem; }

@media (max-width: 40rem) {
  .topbar .inner { gap: .6rem; padding-inline: .9rem; }
  .topbar .who, .brand-text { display: none; }
  .topbar nav a { padding: .4rem .6rem; }
  .topbar .inner form .btn { padding-inline: .5rem; }
  .page-head > .btn, .page-head > a.btn { width: 100%; }
  .tab { padding: .65rem .8rem; }
  .container { padding-inline: .9rem; }
  .auth-card dl { grid-template-columns: 1fr; gap: .15rem; }
  .auth-card dt { margin-top: .5rem; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } @view-transition { navigation: none; } }