/* ============================================================================
   bMail documentation
   Palette and type follow the product brand: yellow #F0B90B on eerie black
   #181A1F, with obsidian #2A313D carrying structure.
   ========================================================================= */

:root {
  --yellow: #F0B90B;
  --yellow-lift: #F8CE45;
  --black: #181A1F;
  --obsidian: #2A313D;
  --white: #FFFFFF;

  --bg: var(--black);
  --bg-raise: #1D2027;
  --bg-sink: #15171C;
  --line: rgba(255, 255, 255, 0.09);
  --line-firm: rgba(255, 255, 255, 0.16);

  --t-100: rgba(255, 255, 255, 0.96);
  --t-70: rgba(255, 255, 255, 0.70);
  --t-55: rgba(255, 255, 255, 0.55);
  --t-35: rgba(255, 255, 255, 0.35);

  --font: 'Archivo', 'Helvetica Neue', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --head-h: 62px;
  --side-w: 274px;
  --toc-w: 216px;
  --shell: 1560px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--head-h) + 20px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--t-70);
  font-family: var(--font);
  font-size: 15.5px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

.defs { position: absolute; width: 0; height: 0; overflow: hidden; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--yellow); color: var(--black); padding: 10px 16px; font-weight: 650;
}
.skip:focus { left: 12px; top: 12px; }

a { color: var(--yellow); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible { outline: 2px solid var(--yellow); outline-offset: 2px; border-radius: 2px; }

/* ------------------------------------------------------------------ header */

.dhead {
  position: sticky; top: 0; z-index: 60;
  height: var(--head-h);
  display: flex; align-items: center; gap: 18px;
  padding: 0 22px;
  background: rgba(24, 26, 31, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.dbrand { display: flex; align-items: center; gap: 10px; color: var(--white); flex-shrink: 0; }
.dbrand:hover { text-decoration: none; }
.dbrand-mark { width: 25px; height: 25px; color: var(--yellow); flex-shrink: 0; }
.dbrand-word { height: 15px; width: auto; fill: currentColor; }
.dbrand-tag {
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--yellow); border: 1px solid rgba(240, 185, 11, 0.4);
  padding: 2px 7px; border-radius: 3px; margin-left: 2px;
}

.dsearch { position: relative; flex: 1; max-width: 460px; margin-left: auto; }
.dsearch > svg { position: absolute; left: 12px; top: 50%; translate: 0 -50%; width: 16px; height: 16px; color: var(--t-35); pointer-events: none; }
.dsearch input {
  width: 100%; height: 38px;
  background: var(--bg-sink); border: 1px solid var(--line);
  border-radius: 7px; color: var(--white);
  font-family: var(--font); font-size: 0.87rem;
  padding: 0 40px 0 36px; outline: none;
  transition: border-color 0.16s, background 0.16s;
}
.dsearch input::placeholder { color: var(--t-35); }
.dsearch input:focus { border-color: rgba(240, 185, 11, 0.55); background: #12141a; }
.dsearch kbd {
  position: absolute; right: 10px; top: 50%; translate: 0 -50%;
  font-family: var(--mono); font-size: 0.68rem; color: var(--t-35);
  border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px;
}
.dsearch input:focus ~ kbd { opacity: 0; }

.dresults {
  position: absolute; left: 0; right: 0; top: calc(100% + 8px);
  background: var(--bg-raise); border: 1px solid var(--line-firm);
  border-radius: 9px; overflow: hidden; max-height: 62vh; overflow-y: auto;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.6);
}
.dresults a { display: block; padding: 11px 15px; color: var(--t-70); border-bottom: 1px solid var(--line); }
.dresults a:last-child { border-bottom: 0; }
.dresults a:hover, .dresults a.cur { background: rgba(240, 185, 11, 0.09); color: var(--white); text-decoration: none; }
.dresults .r-t { display: block; font-weight: 620; color: var(--white); font-size: 0.9rem; line-height: 1.4; }
.dresults .r-g { display: block; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--yellow); margin-bottom: 2px; }
.dresults .r-d { display: block; font-size: 0.79rem; color: var(--t-55); margin-top: 3px; line-height: 1.5; }
.dresults .empty { padding: 16px; color: var(--t-35); font-size: 0.87rem; }

.dhead-links { display: flex; align-items: center; gap: 20px; flex-shrink: 0; }
.dhead-links > a { color: var(--t-55); font-size: 0.88rem; font-weight: 500; }
.dhead-links > a:hover { color: var(--white); text-decoration: none; }
.dbtn {
  background: var(--yellow); color: var(--black) !important;
  padding: 8px 15px; border-radius: 6px; font-weight: 650; font-size: 0.85rem;
  transition: background 0.16s, transform 0.16s var(--ease);
}
.dbtn:hover { background: var(--yellow-lift); transform: translateY(-1px); }

.burger { display: none; background: none; border: 0; padding: 6px; cursor: pointer; flex-direction: column; gap: 4px; }
.burger span { display: block; width: 18px; height: 1.6px; background: var(--white); transition: 0.22s var(--ease); }
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.6px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.6px) rotate(-45deg); }

/* ------------------------------------------------------------------ layout */

.dlayout { display: flex; max-width: var(--shell); margin: 0 auto; }

.dside {
  width: var(--side-w); flex-shrink: 0;
  position: sticky; top: var(--head-h);
  height: calc(100vh - var(--head-h));
  overflow-y: auto;
  padding: 26px 14px 60px 22px;
  border-right: 1px solid var(--line);
  scrollbar-width: thin;
}
.nav-group { margin-bottom: 26px; }
.nav-label {
  font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--t-35); padding: 0 10px; margin-bottom: 8px;
}
.nav-item {
  display: block; padding: 6px 10px; border-radius: 6px;
  color: var(--t-55); font-size: 0.885rem; line-height: 1.45;
  border-left: 2px solid transparent; margin-left: -2px;
  transition: color 0.14s, background 0.14s;
}
.nav-item:hover { color: var(--white); background: rgba(255, 255, 255, 0.04); text-decoration: none; }
.nav-item.on { color: var(--yellow); border-left-color: var(--yellow); background: rgba(240, 185, 11, 0.07); font-weight: 560; }

.dmain { flex: 1; min-width: 0; display: flex; gap: 30px; padding: 0 26px; }
.dbody { flex: 1; min-width: 0; max-width: 800px; padding: 40px 0 90px; }

.dtoc {
  width: var(--toc-w); flex-shrink: 0;
  position: sticky; top: var(--head-h);
  height: calc(100vh - var(--head-h));
  overflow-y: auto; padding: 44px 0 60px;
}
.toc-label {
  font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--t-35); margin-bottom: 10px;
}
.dtoc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.dtoc li a {
  display: block; padding: 5px 0 5px 13px; margin-left: -1px;
  border-left: 1px solid transparent;
  color: var(--t-35); font-size: 0.815rem; line-height: 1.45;
  transition: color 0.14s;
}
.dtoc li.lv-h3 a { padding-left: 26px; font-size: 0.79rem; }
.dtoc li a:hover { color: var(--white); text-decoration: none; }
.dtoc li a.on { color: var(--yellow); border-left-color: var(--yellow); }

/* -------------------------------------------------------------- typography */

.crumb {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--yellow); margin-bottom: 12px;
}
.dbody h1 {
  font-size: clamp(2rem, 3.6vw, 2.72rem); font-weight: 780; font-stretch: 104%;
  letter-spacing: -0.028em; line-height: 1.08; color: var(--white);
  margin: 0 0 16px; text-wrap: balance;
}
.lede { font-size: 1.06rem; color: var(--t-70); margin: 0 0 34px; line-height: 1.66; }

.dbody h2 {
  font-size: 1.44rem; font-weight: 720; letter-spacing: -0.018em; color: var(--white);
  margin: 54px 0 14px; padding-top: 22px; border-top: 1px solid var(--line);
  position: relative; scroll-margin-top: calc(var(--head-h) + 18px);
}
.dbody h3 {
  font-size: 1.08rem; font-weight: 680; letter-spacing: -0.012em; color: var(--white);
  margin: 34px 0 10px; position: relative;
  scroll-margin-top: calc(var(--head-h) + 18px);
}
.dbody h4 { font-size: 0.94rem; font-weight: 660; color: var(--t-100); margin: 24px 0 8px; }

.anchor { position: absolute; left: -20px; width: 20px; opacity: 0; color: var(--yellow); }
.anchor::before { content: "#"; }
h2:hover .anchor, h3:hover .anchor { opacity: 1; }
.anchor:hover { text-decoration: none; }

.dbody p { margin: 0 0 16px; }
.dbody strong { color: var(--t-100); font-weight: 640; }
.dbody ul, .dbody ol { margin: 0 0 18px; padding-left: 22px; }
.dbody li { margin-bottom: 7px; }
.dbody li::marker { color: var(--yellow); }
.dbody hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

code {
  font-family: var(--mono); font-size: 0.855em;
  background: rgba(255, 255, 255, 0.07); border: 1px solid var(--line);
  border-radius: 4px; padding: 1.5px 5px; color: var(--yellow-lift);
}
pre {
  background: var(--bg-sink); border: 1px solid var(--line);
  border-radius: 9px; padding: 16px 18px; overflow-x: auto;
  margin: 0 0 20px; line-height: 1.6;
}
pre code { background: none; border: 0; padding: 0; font-size: 0.815rem; color: var(--t-70); }
pre .k { color: #F8CE45; }
pre .c { color: var(--t-35); font-style: italic; }
pre .s { color: #8fd6a0; }
pre .n { color: #7fb2f0; }

/* ------------------------------------------------------------------ tables */

.tw { overflow-x: auto; margin: 0 0 22px; border: 1px solid var(--line); border-radius: 9px; }
table { border-collapse: collapse; width: 100%; font-size: 0.865rem; min-width: 460px; }
th, td { text-align: left; padding: 11px 15px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th {
  background: var(--bg-sink); color: var(--yellow);
  font-family: var(--mono); font-size: 0.67rem; letter-spacing: 0.11em; text-transform: uppercase; font-weight: 500;
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: rgba(255, 255, 255, 0.022); }
td code { white-space: nowrap; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------------------------------------------------------------- callouts */

.note {
  display: flex; gap: 13px; align-items: flex-start;
  border: 1px solid var(--line); border-left: 2px solid var(--t-35);
  background: rgba(255, 255, 255, 0.028);
  border-radius: 8px; padding: 14px 17px; margin: 0 0 22px;
  font-size: 0.9rem;
}
.note svg { width: 17px; height: 17px; flex-shrink: 0; margin-top: 3px; color: var(--t-55); }
.note p:last-child { margin-bottom: 0; }
.note-t { font-weight: 660; color: var(--white); display: block; margin-bottom: 3px; }
.note.tip { border-left-color: var(--yellow); background: rgba(240, 185, 11, 0.06); }
.note.tip svg { color: var(--yellow); }
.note.warn { border-left-color: #E8913C; background: rgba(232, 145, 60, 0.07); }
.note.warn svg { color: #E8913C; }
.note.stop { border-left-color: #E0575B; background: rgba(224, 87, 91, 0.07); }
.note.stop svg { color: #E0575B; }

/* ---------------------------------------------------------------- diagrams */

.fig { margin: 0 0 26px; }
.fig-frame {
  border: 1px solid var(--line); border-radius: 11px;
  background:
    linear-gradient(rgba(255,255,255,0.017), rgba(255,255,255,0.017)),
    var(--bg-sink);
  padding: 24px 20px; overflow-x: auto;
}
.fig-frame svg { display: block; width: 100%; height: auto; min-width: 440px; }
.fig figcaption {
  font-size: 0.79rem; color: var(--t-35); margin-top: 9px; padding-left: 2px;
}
.fig figcaption b { color: var(--t-55); font-weight: 600; }

/* diagram primitives, so every figure shares one visual language */
.d-box { fill: #212530; stroke: rgba(255,255,255,0.15); stroke-width: 1; }
.d-box-y { fill: rgba(240,185,11,0.12); stroke: var(--yellow); stroke-width: 1.1; }
.d-box-d { fill: #15171C; stroke: rgba(255,255,255,0.1); }
.d-t { fill: #fff; font-family: 'Archivo', sans-serif; font-size: 12.5px; font-weight: 620; }
.d-s { fill: rgba(255,255,255,0.5); font-family: 'JetBrains Mono', monospace; font-size: 9.6px; letter-spacing: 0.04em; }
.d-y { fill: #F0B90B; font-family: 'JetBrains Mono', monospace; font-size: 9.6px; letter-spacing: 0.05em; }
.d-l { stroke: rgba(255,255,255,0.28); stroke-width: 1.2; fill: none; }
.d-l-y { stroke: var(--yellow); stroke-width: 1.4; fill: none; }
.d-dash { stroke-dasharray: 4 4; }
.d-lbl { fill: rgba(255,255,255,0.62); font-family: 'JetBrains Mono', monospace; font-size: 9.2px; }

/* --------------------------------------------------------------- key/value */

.kv { border: 1px solid var(--line); border-radius: 9px; overflow: hidden; margin: 0 0 22px; }
.kv-row { display: grid; grid-template-columns: 190px 1fr; gap: 0; border-bottom: 1px solid var(--line); }
.kv-row:last-child { border-bottom: 0; }
.kv-k {
  padding: 11px 15px; background: var(--bg-sink);
  font-family: var(--mono); font-size: 0.76rem; color: var(--t-55);
  border-right: 1px solid var(--line);
}
.kv-v { padding: 11px 15px; font-size: 0.88rem; }
.kv-v code { font-size: 0.8rem; }

/* ------------------------------------------------------------------- cards */

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(228px, 1fr)); gap: 14px; margin: 0 0 24px; }
.card {
  border: 1px solid var(--line); border-radius: 10px; padding: 17px 18px;
  background: linear-gradient(160deg, rgba(255,255,255,0.035), rgba(255,255,255,0));
}
.card h4 { margin: 0 0 6px; font-size: 0.94rem; color: var(--white); }
.card p { margin: 0; font-size: 0.85rem; color: var(--t-55); line-height: 1.6; }
.card .card-n {
  font-family: var(--mono); font-size: 0.66rem; color: var(--yellow);
  letter-spacing: 0.13em; display: block; margin-bottom: 8px;
}

/* ------------------------------------------------------------------ badges */

.tag {
  display: inline-block; font-family: var(--mono); font-size: 0.65rem;
  letter-spacing: 0.11em; text-transform: uppercase; padding: 2px 8px;
  border-radius: 4px; border: 1px solid var(--line-firm); color: var(--t-55);
  vertical-align: middle;
}
.tag.done { color: var(--yellow); border-color: rgba(240,185,11,0.45); background: rgba(240,185,11,0.08); }
.tag.now { color: #7fd1a0; border-color: rgba(127,209,160,0.4); background: rgba(127,209,160,0.08); }
.tag.next { color: #7fb2f0; border-color: rgba(127,178,240,0.38); background: rgba(127,178,240,0.08); }
.tag.later { color: var(--t-35); }

/* ---------------------------------------------------------------- timeline */

.tl { position: relative; margin: 0 0 10px; padding-left: 30px; }
.tl::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 1px; background: var(--line-firm); }
.tl-item { position: relative; margin-bottom: 30px; }
.tl-item::before {
  content: ""; position: absolute; left: -30px; top: 6px;
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--line-firm);
}
.tl-item.is-done::before { border-color: var(--yellow); background: var(--yellow); }
.tl-item.is-now::before { border-color: var(--yellow); background: var(--bg); box-shadow: 0 0 0 4px rgba(240,185,11,0.16); }
.tl-h { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.tl-h h3 { margin: 0; font-size: 1.02rem; }
.tl-when { font-family: var(--mono); font-size: 0.7rem; color: var(--t-35); letter-spacing: 0.07em; }
.tl-item ul { margin-top: 8px; }

/* ------------------------------------------------------------------ pager */

.pager { display: flex; justify-content: space-between; gap: 14px; margin-top: 64px; padding-top: 26px; border-top: 1px solid var(--line); }
.pager-a {
  flex: 1; max-width: 300px; border: 1px solid var(--line); border-radius: 9px;
  padding: 13px 16px; color: var(--t-70);
  transition: border-color 0.16s, transform 0.2s var(--ease);
}
.pager-a:hover { border-color: rgba(240,185,11,0.5); text-decoration: none; transform: translateY(-2px); }
.pager-a span { display: block; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.13em; text-transform: uppercase; color: var(--t-35); margin-bottom: 3px; }
.pager-a strong { color: var(--white); font-weight: 620; font-size: 0.92rem; }
.pager-a.next { text-align: right; margin-left: auto; }

/* ------------------------------------------------------------------ footer */

.dfoot { margin-top: 42px; padding-top: 22px; border-top: 1px solid var(--line); }
.dfoot p { margin: 0; max-width: 62ch; font-size: 0.79rem; line-height: 1.65; color: var(--t-35); }
.dfoot-legal { margin-top: 10px !important; font-family: var(--mono); font-size: 0.72rem; }

/* ------------------------------------------------------------------ swatch */

.sw-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(158px, 1fr)); gap: 12px; margin: 0 0 24px; }
.sw { border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.sw-chip { height: 78px; }
.sw-meta { padding: 11px 13px; font-size: 0.8rem; }
.sw-meta b { display: block; color: var(--white); font-weight: 620; margin-bottom: 2px; }
.sw-meta code { font-size: 0.74rem; background: none; border: 0; padding: 0; color: var(--t-55); }

.logo-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin: 0 0 24px; }
.logo-cell { border: 1px solid var(--line); border-radius: 9px; padding: 22px; display: grid; place-items: center; min-height: 118px; }
.logo-cell svg { max-width: 100%; height: auto; }
.logo-cap { font-family: var(--mono); font-size: 0.66rem; color: var(--t-35); letter-spacing: 0.1em; text-transform: uppercase; text-align: center; margin-top: 8px; }

/* --------------------------------------------------------------- responsive */

@media (max-width: 1180px) {
  .dtoc { display: none; }
}
@media (max-width: 900px) {
  .burger { display: flex; }
  .dhead { gap: 12px; padding: 0 14px; }
  .dbrand-tag, .dhead-links > a:not(.dbtn) { display: none; }
  .dsearch { max-width: none; }
  .dside {
    position: fixed; left: 0; top: var(--head-h); bottom: 0; z-index: 55;
    width: 280px; background: var(--bg-raise);
    transform: translateX(-102%); transition: transform 0.26s var(--ease);
    border-right: 1px solid var(--line-firm);
  }
  .dside.open { transform: none; }
  .dmain { padding: 0 18px; }
  .dbody { padding: 28px 0 70px; }
  .kv-row { grid-template-columns: 1fr; }
  .kv-k { border-right: 0; border-bottom: 1px solid var(--line); }
}

/* Phone: burger, brand and the primary action share the top row, and search
   drops to a row of its own. Squeezed into one row it collapsed to about 100px,
   which is too narrow to read what you typed. */
@media (max-width: 620px) {
  :root { --head-h: 106px; }
  .dhead { flex-wrap: wrap; align-content: center; padding: 0 12px 10px; row-gap: 8px; }
  .dhead > .burger { order: 1; }
  .dbrand { order: 2; }
  .dhead-links { order: 3; margin-left: auto; }
  .dsearch { order: 4; flex: 0 0 100%; max-width: none; margin-left: 0; }
  .dbrand-mark { width: 22px; height: 22px; }
  .dbrand-word { height: 13px; }
  .dbtn { height: 32px; padding: 0 12px; font-size: 0.8rem; }
  .dbody h1 { font-size: clamp(1.6rem, 7vw, 2rem); }
  .dmain { padding: 0 14px; }
  .fig-frame { padding: 16px 12px; }
  .pager { flex-direction: column; }
  .pager-a { max-width: none; }
}
@media (max-width: 560px) {
  .dsearch kbd { display: none; }
  .pager { flex-direction: column; }
  .pager-a { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}