/* Email — bespoke diagrams of the outbound-mail module (eml-*).
   The module is a backend service ("the post office"): consumers hand it a
   message, it composes + sends over SMTP. Three diagram groups — the
   architecture flow board, the two delivery modes (inline vs queued), and the
   letter previews — share one calm, framed register (surface fills, hairline borders,
   accent edges for the focal element).
   Loaded by index.html and the _workzone/* pages that draw these, on top of
   ../module.css.
   Placement convention: docs/architecture/README.md §Styling. */

/* ═══════════════════════════════════════════
   Flow board — the whole module at a glance
   A left-to-right "production line": stacked consumer requests gather onto one
   wire into the focal Email service (compose | send), which forks into two
   delivery tracks (inline / queued) that merge back into SMTP → inbox. A dashed
   service bus underneath feeds the line — the smtp_settings singleton plus the
   three modules Email leans on (Auth, Admin, Broker). Connectors are CSS
   hairlines; the two tracks are pinned to equal-height rows so the fork / merge
   arms land exactly on each track's centre (25% / 75%) whatever the content.
   The board breaks out of the 720px page to a wider canvas, centred on the
   viewport — the flow needs the horizontal room; the page chrome stays narrow.
   ═══════════════════════════════════════════ */
.eml-flow {
  width: min(1080px, calc(100vw - 3rem));
  margin-left: 50%;
  transform: translateX(-50%);
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 1.8rem 1.9rem 1.6rem;
  --eml-wire: var(--s2-glow);
  --eml-wire-w: 2px;
}

.eml-flow__cap {
  display: block;
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.7rem;
}

/* ── The line: input · gather · rail (core + fork) ── */
.eml-flow__line {
  display: grid;
  grid-template-columns: 150px 30px 1fr;
  align-items: stretch;
}

/* input — stacked consumer requests */
.eml-in {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.5rem;
}
.eml-in__lbl {
  font-family: var(--mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-align: center;
}
.eml-req {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.45rem 0.55rem;
  text-align: center;
}
.eml-req b {
  display: block;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.15;
}
.eml-req code {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--text-muted);
}
.eml-req--v2 {
  border-style: dashed;
  opacity: 0.75;
}
.eml-req--v2 b {
  color: var(--text-dim);
}
.eml-v2 {
  font-family: var(--mono);
  font-size: 0.52rem;
  font-weight: 700;
  color: #fff;
  background: var(--text-muted);
  border-radius: var(--pill-radius);
  padding: 0.05rem 0.26rem;
  margin-left: 0.25rem;
  vertical-align: middle;
}

/* gather — consumers collected onto one wire into the core */
.eml-join {
  position: relative;
}
.eml-join::before {
  /* vertical collector spanning the request stack */
  content: "";
  position: absolute;
  left: 5px;
  top: 16%;
  bottom: 16%;
  width: var(--eml-wire-w);
  background: var(--eml-wire);
}
.eml-join::after {
  /* horizontal wire to the core */
  content: "";
  position: absolute;
  left: 5px;
  right: 8px;
  top: 50%;
  height: var(--eml-wire-w);
  background: var(--eml-wire);
  transform: translateY(-50%);
}
.eml-join > i {
  /* arrowhead into the core */
  position: absolute;
  right: 0;
  top: 50%;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid var(--eml-wire);
  transform: translateY(-50%);
}

/* rail — focal core + the fork */
.eml-rail {
  display: grid;
  grid-template-columns: 210px 1fr;
  align-items: center;
}

/* ── Focal node: Email ── */
.eml-core {
  position: relative;
  background: var(--tint-6);
  border: var(--border-w) solid var(--accent);
  border-radius: var(--radius);
  padding: 0.85rem 0.9rem 0.95rem;
  box-shadow: 0 4px 18px rgba(184, 96, 48, 0.16);
  z-index: 2;
}
.eml-core__name {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--accent);
}
.eml-core__glyph {
  font-size: 1.05rem;
  line-height: 1;
}
.eml-core__role {
  font-size: 0.66rem;
  color: var(--text-dim);
  margin: 0.1rem 0 0.6rem;
  line-height: 1.25;
}
.eml-cams {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
}
.eml-cam {
  background: var(--paper);
  border: 1.5px solid var(--tint-25);
  border-radius: var(--radius-md);
  padding: 0.45rem 0.5rem;
  text-align: center;
}
.eml-cam b {
  display: block;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text);
}
.eml-cam span {
  display: block;
  margin-top: 0.12rem;
  font-size: 0.57rem;
  color: var(--text-muted);
  line-height: 1.2;
}
.eml-core__helpers {
  margin-top: 0.6rem;
  font-family: var(--mono);
  font-size: 0.57rem;
  color: var(--text-dim);
  text-align: center;
}

/* ── Fork: branch · two tracks · merge · sink ── */
.eml-fork {
  display: grid;
  grid-template-columns: 44px 1fr 50px 150px;
  align-items: stretch;
}

/* branch — core stub, vertical spine, two arrowed arms into the tracks */
.eml-branch {
  position: relative;
}
.eml-branch__stub {
  position: absolute;
  left: 0;
  top: 50%;
  width: 18px;
  height: var(--eml-wire-w);
  background: var(--eml-wire);
  transform: translateY(-50%);
}
.eml-branch::before {
  /* spine 25% → 75% */
  content: "";
  position: absolute;
  left: 18px;
  top: 25%;
  bottom: 25%;
  width: var(--eml-wire-w);
  background: var(--eml-wire);
}
.eml-branch > i {
  position: absolute;
  left: 18px;
  right: 0;
  height: var(--eml-wire-w);
  background: var(--eml-wire);
  transform: translateY(-50%);
}
.eml-branch > i.t {
  top: 25%;
}
.eml-branch > i.b {
  top: 75%;
}
.eml-branch > i::after {
  /* arrowhead into a track */
  content: "";
  position: absolute;
  right: -2px;
  top: 50%;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 7px solid var(--eml-wire);
  transform: translateY(-50%);
}

/* two tracks — equal-height rows pin each centre to 25% / 75% */
.eml-tracks {
  align-self: stretch;
  display: grid;
  grid-template-rows: 1fr 1fr;
  row-gap: 0;
  min-height: 12rem;
}
.eml-track {
  margin: 0.3rem 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border);
  padding: 0.55rem 0.7rem;
}
.eml-track--inline {
  background: var(--s4-pale);
  border-color: var(--s4-glow);
}
.eml-track--queue {
  background: var(--s3-pale);
  border-color: var(--s3-glow);
}
.eml-track__top {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}
.eml-track__name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
}
.eml-track--inline .eml-track__name {
  color: var(--s4);
}
.eml-track--queue .eml-track__name {
  color: var(--s3);
}
.eml-track__sync {
  font-family: var(--mono);
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.eml-track__for {
  font-size: 0.62rem;
  color: var(--text-dim);
  margin-bottom: 0.32rem;
}
.eml-track__for::before {
  content: "▸ ";
  color: var(--accent-muted);
}
.eml-track__for b {
  color: var(--text);
  font-weight: 600;
}
.eml-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}
.eml-chip {
  font-family: var(--mono);
  font-size: 0.57rem;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--pill-radius);
  padding: 0.1rem 0.36rem;
  color: var(--text-dim);
}
.eml-track__note {
  margin-top: 0.3rem;
  font-size: 0.6rem;
  color: var(--text-dim);
}
.eml-track__note code {
  font-family: var(--mono);
  font-size: 0.57rem;
  color: var(--s4);
}

/* merge — arms collect both tracks into the spine, one arrow to the sink */
.eml-merge {
  position: relative;
}
.eml-merge::before {
  content: "";
  position: absolute;
  right: 26px;
  top: 25%;
  bottom: 25%;
  width: var(--eml-wire-w);
  background: var(--eml-wire);
}
.eml-merge > i {
  position: absolute;
  height: var(--eml-wire-w);
  background: var(--eml-wire);
  transform: translateY(-50%);
}
.eml-merge > i.t {
  left: 0;
  right: 26px;
  top: 25%;
}
.eml-merge > i.b {
  left: 0;
  right: 26px;
  top: 75%;
}
.eml-merge > i.out {
  left: calc(100% - 26px);
  right: 0;
  top: 50%;
}
.eml-merge > i.out::after {
  /* arrowhead into the sink */
  content: "";
  position: absolute;
  right: -2px;
  top: 50%;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 7px solid var(--eml-wire);
  transform: translateY(-50%);
}

/* sink — SMTP transport → inbox */
.eml-sink {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.eml-smtp {
  flex: 1;
  background: var(--s2-pale);
  border: 1.5px solid var(--s2-glow);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.4rem;
  text-align: center;
}
.eml-smtp b {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--s2);
}
.eml-smtp span {
  font-family: var(--mono);
  font-size: 0.54rem;
  color: var(--text-muted);
}
.eml-sink__to {
  color: var(--eml-wire);
  font-size: 0.95rem;
  font-weight: 700;
}
.eml-mbox {
  text-align: center;
  font-size: 1.5rem;
  line-height: 1;
}
.eml-mbox small {
  display: block;
  font-size: 0.56rem;
  color: var(--text-dim);
  margin-top: 0.15rem;
}

/* ── Service bus — what feeds the line ── */
.eml-bus {
  position: relative;
  margin-top: 1.6rem;
  padding-top: 1.4rem;
  border-top: 2px dashed var(--border);
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr 1fr;
  gap: 0.8rem;
}
.eml-bus::before {
  content: "питание ленты";
  position: absolute;
  top: -0.62rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--paper);
  padding: 0 0.6rem;
  font-family: var(--mono);
  font-size: 0.56rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}
.eml-sat {
  position: relative;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border);
  background: var(--surface);
  padding: 0.6rem 0.7rem;
}
.eml-sat::before {
  /* feed arrowhead up to the line */
  content: "";
  position: absolute;
  top: -1.4rem;
  left: 1.1rem;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 8px solid var(--eml-wire);
}
.eml-sat::after {
  /* feed stem */
  content: "";
  position: absolute;
  top: -0.62rem;
  left: calc(1.1rem + 5px);
  width: var(--eml-wire-w);
  height: 0.62rem;
  background: var(--eml-wire);
  transform: translateX(-50%);
}
.eml-sat__name {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.18rem;
}
.eml-sat__name a {
  font-weight: 700;
}
.eml-sat__role {
  font-size: 0.62rem;
  color: var(--text-dim);
  line-height: 1.35;
}

.eml-sat--cfg {
  background: var(--tint-8);
  border-color: var(--tint-25);
}
.eml-sat--cfg .eml-sat__name {
  color: var(--accent);
}
.eml-sat--cfg .eml-sat__name code {
  font-family: var(--mono);
  font-size: 0.8rem;
}

/* stack footer */
.eml-foot {
  margin-top: 1.2rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--text-muted);
}
.eml-foot__lbl {
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.eml-stk {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--pill-radius);
  padding: 0.12rem 0.4rem;
  color: var(--text-dim);
}

@media (max-width: 720px) {
  .eml-flow__line,
  .eml-rail,
  .eml-fork,
  .eml-bus {
    grid-template-columns: 1fr;
  }
}

/* Notes set below a diagram inside a section — restore vertical rhythm
   (the global reset zeroes margins; .notes itself carries none). */
.eml-gap {
  margin-top: 0.7rem;
}

/* ═══════════════════════════════════════════
   Delivery modes — inline (sync) vs queued (SAQ)
   Two cards side by side; edge hue separates the two paths.
   ═══════════════════════════════════════════ */
.eml-modes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}

.eml-mode {
  padding: 0.85rem 0.95rem;
  border-left-width: var(--border-w);
  border-left-style: solid;
}

.eml-mode--inline {
  border-left-color: var(--s3);
}

.eml-mode--queue {
  border-left-color: var(--s2);
}

.eml-mode__head {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.4rem;
}

.eml-mode__name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
}

.eml-mode__tag {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.15rem 0.4rem;
  border-radius: var(--pill-radius);
  color: #fff;
}

.eml-mode--inline .eml-mode__tag {
  background: var(--s3);
}

.eml-mode--queue .eml-mode__tag {
  background: var(--s2);
}

.eml-mode__body {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.55;
}

.eml-mode__use {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.eml-mode__use b {
  color: var(--text-dim);
  font-weight: 600;
}

@media (max-width: 640px) {
  .eml-modes {
    grid-template-columns: 1fr;
  }
}

/* ═══════════════════════════════════════════
   Letter preview — a schematic of a rendered email
   Framed like a mail client: header band (from · subject), prose body, a
   CTA button, a muted footer. Paired RU / EN side by side for i18n.
   ═══════════════════════════════════════════ */
.eml-mails {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}

.eml-mail {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.eml-mail__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.7rem;
  background: var(--tint-6);
  border-bottom: 1px solid var(--border);
}

.eml-mail__from {
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--text-dim);
}

.eml-mail__lang {
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.35rem;
  border-radius: var(--pill-radius);
  background: var(--accent-muted);
  color: #fff;
}

.eml-mail__body {
  padding: 0.75rem 0.8rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.eml-mail__subj {
  display: block;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.eml-mail__btn {
  display: inline-block;
  margin: 0.55rem 0;
  padding: 0.35rem 0.85rem;
  font-size: 0.74rem;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  border-radius: 6px;
}

.eml-mail__link {
  font-family: var(--mono);
  font-size: 0.64rem;
  color: var(--text-muted);
  word-break: break-all;
}

.eml-mail__foot {
  margin-top: 0.5rem;
}

@media (max-width: 640px) {
  .eml-mails {
    grid-template-columns: 1fr;
  }
}

/* ── Compact letter spec — for the shorter letters (reset, test) shown as a
   row of facts rather than a full preview. ── */
.eml-spec {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 0.8rem;
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.eml-spec dt {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  padding-top: 0.1rem;
}

.eml-spec dd {
  color: var(--text);
}