:root {
  --blue: #2f6fed;
  --blue-deep: #1e4fc4;
  --blue-soft: #5b8ef5;
  --ink: #132238;
  --ink-soft: #3a4f66;
  --muted: #6b7f96;
  --danger: #b42318;
  --glass: rgba(255, 255, 255, 0.42);
  --glass-strong: rgba(255, 255, 255, 0.58);
  --glass-border: rgba(255, 255, 255, 0.72);
  --radius: 24px;
  --radius-sm: 14px;
  --font: "IBM Plex Sans KR", system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "IBM Plex Sans KR", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  background: #dbe7f8;
}
.wrap { max-width: 920px; margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }
code {
  font-size: 0.9em;
  background: rgba(255,255,255,0.45);
  padding: 0.15em 0.45em;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.55);
}
.muted { color: var(--muted); font-size: 0.95rem; margin: 0; }

.page-bg, .auth-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 70% 55% at 12% 18%, rgba(91, 142, 245, 0.45), transparent 55%),
    radial-gradient(ellipse 65% 50% at 88% 12%, rgba(255, 255, 255, 0.7), transparent 50%),
    radial-gradient(ellipse 70% 55% at 70% 88%, rgba(30, 79, 196, 0.28), transparent 55%),
    linear-gradient(160deg, #eef4ff 0%, #d7e5fb 48%, #c9d9f5 100%);
}

.glass-card, .auth-card, .glass-panel, .grid-2 article, table.stack, .tree, .cost, .notice {
  background: var(--glass);
  backdrop-filter: blur(22px) saturate(1.35);
  -webkit-backdrop-filter: blur(22px) saturate(1.35);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 18px 50px -28px rgba(30, 60, 120, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.75);
}

.auth-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
}
.auth-card {
  position: relative;
  width: min(400px, 92vw);
  border-radius: 28px;
  padding: 40px 34px 42px;
}
.brand-lockup {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  margin: 0 0 8px;
}
.brand-icon-wrap {
  position: relative;
  width: 92px;
  height: 92px;
  border-radius: 32px;
  background: linear-gradient(145deg, rgba(255,255,255,0.55), rgba(255,255,255,0.08));
  box-shadow:
    0 12px 28px -14px rgba(30, 79, 196, 0.45),
    inset 0 1px 0 rgba(255,255,255,0.7);
}
.brand-icon-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 32px;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(255,255,255,0.45) 0%, rgba(255,255,255,0.05) 42%, rgba(255,255,255,0) 60%);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.55);
}
.brand-icon {
  width: 92px;
  height: 92px;
  border-radius: 32px;
  display: block;
  object-fit: cover;
}
.brand-mark {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--blue-deep);
  margin: 0;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--blue-deep);
  margin: 0;
}
.brand-icon-sm {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 6px 14px -8px rgba(30, 79, 196, 0.5);
}
.auth-card h1 {
  font-family: var(--display);
  font-size: 1.28rem;
  margin: 18px 0 8px;
  font-weight: 600;
  color: var(--ink);
  text-align: center;
}
.auth-lead { text-align: center; color: var(--muted); font-size: 0.95rem; margin: 0; }
.auth-error {
  background: rgba(255, 235, 232, 0.75);
  color: var(--danger);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin: 16px 0 0;
  border: 1px solid rgba(255, 255, 255, 0.65);
}
.auth-card form { margin-top: 26px; display: grid; gap: 16px; }
.auth-card label {
  display: grid;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-weight: 600;
}
.auth-card input {
  font: inherit;
  color: var(--ink);
  padding: 14px 16px;
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.38);
  backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 2px rgba(30, 60, 120, 0.06);
}
.auth-card input:focus {
  outline: none;
  border-color: rgba(47, 111, 237, 0.55);
  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.18);
}

.btn {
  font: inherit;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.65);
  cursor: pointer;
  padding: 14px 18px;
  background: rgba(255,255,255,0.4);
  color: var(--blue-deep);
  backdrop-filter: blur(12px);
  transition: filter 0.15s ease, transform 0.12s ease;
}
.btn:active { transform: translateY(1px); }
.btn.ghost { color: var(--ink-soft); }
.btn.sm { padding: 8px 14px; font-size: 0.82rem; border-radius: 12px; }
.btn.app-cta {
  margin-top: 8px;
  min-height: 52px;
  border-radius: 16px;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
  font-size: 1.02rem;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.28) 0%, rgba(255,255,255,0) 42%),
    linear-gradient(145deg, #5b8ef5 0%, #2f6fed 48%, #1e4fc4 100%);
  box-shadow: 0 14px 28px -16px rgba(30, 79, 196, 0.7);
}
.btn.app-cta:hover { filter: brightness(1.05); color: #fff; }

.plan-body { min-height: 100vh; }
.top.glass-bar, .top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,0.38);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
  border-bottom: 1px solid rgba(255,255,255,0.55);
}
.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}
.top-meta { display: flex; align-items: center; gap: 10px; }
.who { font-size: 0.85rem; color: var(--muted); }
.inline { display: inline; margin: 0; }

.hero { padding: 64px 24px 36px; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  margin: 0 0 16px;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(2.6rem, 6vw, 3.6rem);
  margin: 0 0 18px;
  letter-spacing: -0.03em;
  color: var(--blue-deep);
}
.lead { font-size: 1.12rem; color: var(--ink-soft); max-width: 38em; margin: 0; }
.notice {
  margin-top: 24px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  color: #6a4028;
  font-size: 0.92rem;
}

.block { padding: 48px 0; }
.block h2 {
  font-family: var(--display);
  font-size: 1.55rem;
  margin: 0 0 22px;
  letter-spacing: -0.02em;
}
.block h3 { margin: 0 0 10px; font-size: 1.05rem; }
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}
@media (max-width: 720px) {
  .grid-2 { grid-template-columns: 1fr; }
}
.grid-2 article {
  border-radius: var(--radius);
  padding: 22px 24px;
}
.grid-2 ul, .grid-2 ol { margin: 0; padding-left: 1.15em; color: var(--ink-soft); }
.grid-2 li { margin: 0.35em 0; }

table.stack {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius);
  overflow: hidden;
}
table.stack th, table.stack td {
  text-align: left;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.45);
  vertical-align: top;
}
table.stack th {
  width: 7.5rem;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.88rem;
}
table.stack tr:last-child th,
table.stack tr:last-child td { border-bottom: none; }

.tree {
  list-style: none;
  padding: 8px 4px;
  margin: 0 0 12px;
  border-radius: var(--radius);
}
.tree li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 14px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.4);
}
.tree li:last-child { border-bottom: none; }
.tree span {
  font-weight: 700;
  color: var(--blue);
  min-width: 4.5rem;
  font-size: 0.85rem;
}
.flow { padding-left: 1.2em; color: var(--ink-soft); }
.flow li { margin: 0.5em 0; }
.cost {
  list-style: none;
  padding: 8px 4px;
  margin: 0;
  border-radius: var(--radius);
}
.cost li {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.4);
}
.cost li:last-child { border-bottom: none; }
.cost em { font-style: normal; color: var(--blue-deep); font-weight: 700; }

.close { padding: 56px 24px 72px; }
.close h2 { font-family: var(--display); margin: 0 0 12px; }
.close p { color: var(--ink-soft); max-width: 36em; }
.foot {
  padding: 22px 0 32px;
  font-size: 0.8rem;
  color: var(--muted);
}

/* admin */
.admin-main { padding: 36px 24px 64px; display: grid; gap: 22px; }
.glass-panel {
  border-radius: var(--radius);
  padding: 22px 24px 26px;
}
.glass-panel h1, .glass-panel h2 {
  margin: 0 0 14px;
  font-size: 1.25rem;
  color: var(--blue-deep);
}
.admin-hint { margin: -6px 0 14px; }
.session-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}
@media (max-width: 640px) {
  .session-grid { grid-template-columns: 1fr; }
}
.session-grid div {
  background: rgba(255,255,255,0.28);
  border: 1px solid rgba(255,255,255,0.55);
  border-radius: 14px;
  padding: 12px 14px;
}
.session-grid dt {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 600;
  margin: 0 0 4px;
}
.session-grid dd {
  margin: 0;
  font-weight: 700;
  color: var(--ink);
  word-break: break-all;
}
.table-wrap { overflow-x: auto; }
.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.admin-table th, .admin-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.4);
}
.admin-table th {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}
.admin-table tr.ok td:last-child { color: #157a4b; font-weight: 700; }
.admin-table tr.fail td:last-child { color: var(--danger); font-weight: 700; }

/* ── Doc materials ── */
.doc-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  font-weight: 600;
}
.doc-nav a { color: var(--ink-soft); opacity: 0.85; }
.doc-nav a:hover { color: var(--blue-deep); }
@media (max-width: 980px) {
  .doc-nav { display: none; }
}
.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.hero-chips span {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--blue-deep);
  background: rgba(255,255,255,0.45);
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: 999px;
  padding: 6px 12px;
  backdrop-filter: blur(10px);
}
.sec-head { margin-bottom: 22px; }
.sec-label {
  margin: 0 0 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
}
.sec-desc { margin: 8px 0 0; color: var(--ink-soft); max-width: 40em; }
.subh { margin: 28px 0 14px; font-size: 1.05rem; color: var(--blue-deep); }



.phase-track {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: stretch;
}
@media (max-width: 800px) {
  .phase-track { grid-template-columns: 1fr; }
  .phase-join { transform: rotate(90deg); }
}
.phase-card { padding: 22px; }
.phase-card.accent { box-shadow: 0 0 0 1px rgba(47,111,237,0.25), 0 18px 50px -28px rgba(30,60,120,0.45); }
.phase-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(145deg, var(--blue-soft), var(--blue-deep));
  border-radius: 999px;
  padding: 4px 10px;
  margin-bottom: 10px;
}
.phase-join {
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--blue);
}
.check { margin: 0; padding-left: 1.1em; color: var(--ink-soft); }
.check li { margin: 0.4em 0; }

.layer-stack { display: grid; gap: 10px; margin-bottom: 16px; }
.layer {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 14px 18px;
  border-radius: 16px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.layer .ly {
  min-width: 4.2rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
}
.layer b { color: var(--ink); margin-right: 6px; }
.stack-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
@media (max-width: 800px) {
  .stack-grid { grid-template-columns: 1fr 1fr; }
}
.stack-item {
  padding: 14px 16px;
  border-radius: 16px;
  display: grid;
  gap: 4px;
}
.stack-item strong { color: var(--blue-deep); font-size: 0.85rem; }
.stack-item span { color: var(--ink-soft); font-size: 0.88rem; }

.skill-tree { padding: 22px 18px; }
.tier { margin: 0; }
.tier-label {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--blue-deep);
  margin-bottom: 10px;
}
.tier-nodes { display: flex; flex-wrap: wrap; gap: 8px; }
.node {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.5);
  border: 1px solid rgba(255,255,255,0.75);
  color: var(--ink);
}
.node.hot {
  background: rgba(47,111,237,0.12);
  border-color: rgba(47,111,237,0.35);
  color: var(--blue-deep);
}
.node.ai {
  background: rgba(30,79,196,0.14);
  border-color: rgba(30,79,196,0.3);
  color: var(--blue-deep);
}
.tier-line {
  height: 18px;
  margin: 6px 0 6px 12px;
  border-left: 2px dashed rgba(47,111,237,0.35);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}
@media (max-width: 800px) {
  .grid-3 { grid-template-columns: 1fr; }
}
.mini { padding: 16px 18px; }
.mini h3 { margin: 0 0 6px; font-size: 0.95rem; color: var(--blue-deep); }
.mini p { margin: 0; color: var(--ink-soft); font-size: 0.88rem; }

.iot-arch {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: space-between;
  gap: 10px;
  padding: 20px;
  margin-bottom: 8px;
}
.iot-col { flex: 1 1 120px; text-align: center; }
.iot-col p { margin: 8px 0 0; font-size: 0.78rem; color: var(--muted); }
.iot-box {
  padding: 16px 12px;
  border-radius: 16px;
  font-weight: 800;
  font-size: 0.88rem;
  background: rgba(255,255,255,0.5);
  border: 1px solid rgba(255,255,255,0.75);
}
.iot-box.core {
  background: linear-gradient(145deg, rgba(91,142,245,0.3), rgba(30,79,196,0.2));
  color: var(--blue-deep);
}
.iot-box.hot {
  background: rgba(47,111,237,0.16);
  border-color: rgba(47,111,237,0.4);
  color: var(--blue-deep);
}
.iot-sep {
  display: grid;
  place-items: center;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--blue);
  min-width: 42px;
}

.seq { list-style: none; padding: 0; margin: 0 0 20px; display: grid; gap: 10px; }
.seq li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255,255,255,0.38);
  border: 1px solid rgba(255,255,255,0.65);
}
.seq span {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(145deg, var(--blue-soft), var(--blue-deep));
}
.seq strong { display: block; margin-bottom: 2px; color: var(--ink); }
.seq p { margin: 0; color: var(--ink-soft); font-size: 0.9rem; }
.iot-grids { margin-top: 8px; }
.mini-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.mini-table th, .mini-table td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.45);
  vertical-align: top;
}
.mini-table th {
  width: 5.5rem;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.8rem;
}
.mini-table tr:last-child th,
.mini-table tr:last-child td { border-bottom: none; }

.infra-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
@media (max-width: 800px) {
  .infra-grid { grid-template-columns: 1fr 1fr; }
}
.infra-box {
  padding: 18px 16px;
  border-radius: 16px;
  display: grid;
  gap: 6px;
  text-align: center;
}
.infra-box strong { color: var(--blue-deep); }
.infra-box span { font-size: 0.82rem; color: var(--ink-soft); }

.timeline { padding: 8px 8px 8px 4px; }
.tl-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  padding: 14px 16px;
  border-left: 2px solid rgba(47,111,237,0.35);
  margin-left: 28px;
  position: relative;
}
.tl-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(47,111,237,0.2);
}
.tl-item > span {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--blue);
}
.tl-item strong { display: block; margin-bottom: 2px; }
.tl-item p { margin: 0; color: var(--ink-soft); font-size: 0.88rem; }

.top-inner { gap: 16px; }

/* ── System architecture ── */
.sys-arch {
  padding: 20px 18px 22px;
  display: grid;
  gap: 10px;
}
.sys-lane {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 12px;
  align-items: stretch;
}
@media (max-width: 720px) {
  .sys-lane { grid-template-columns: 1fr; }
}
.sys-lane-label {
  display: grid;
  place-items: center;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--blue-deep);
  background: rgba(255,255,255,0.4);
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: 14px;
  padding: 10px 8px;
}
.sys-lane-body {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.sys-lane-body.cols { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); }
.sys-lane-body.stack { display: grid; grid-template-columns: 1fr; }
@media (max-width: 900px) {
  .sys-lane-body.cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.sys-box {
  flex: 1 1 160px;
  padding: 14px 14px 12px;
  border-radius: 14px;
  background: rgba(255,255,255,0.48);
  border: 1px solid rgba(255,255,255,0.75);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.65);
}
.sys-box.wide { flex: 1 1 100%; }
.sys-box strong {
  display: block;
  font-size: 0.9rem;
  color: var(--ink);
  margin-bottom: 4px;
}
.sys-box span {
  display: block;
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.45;
}
.sys-box.edge {
  background: rgba(255,255,255,0.55);
}
.sys-box.core {
  background: linear-gradient(160deg, rgba(91,142,245,0.28), rgba(30,79,196,0.16));
  border-color: rgba(47,111,237,0.28);
}
.sys-box.core strong { color: var(--blue-deep); }
.sys-box.iot {
  background: rgba(47,111,237,0.08);
  border-color: rgba(47,111,237,0.3);
}
.sys-box.iot.hot {
  background: linear-gradient(160deg, rgba(91,142,245,0.2), rgba(47,111,237,0.12));
  border-color: rgba(47,111,237,0.45);
}
.sys-box.data {
  background: rgba(255,255,255,0.62);
}
.sys-box.ai {
  background: linear-gradient(160deg, rgba(30,79,196,0.18), rgba(91,142,245,0.12));
  border-color: rgba(30,79,196,0.28);
}
.sys-box.ai strong { color: var(--blue-deep); }
.sys-box.ext {
  background: rgba(255,255,255,0.4);
  text-align: center;
}
.sys-flow {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2px 0;
}
.sys-flow span,
.sys-flow.side span {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--blue);
  letter-spacing: 0.04em;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(47,111,237,0.1);
  border: 1px solid rgba(47,111,237,0.2);
}
.sys-flow::before,
.sys-flow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(47,111,237,0.35), transparent);
  margin: 0 10px;
}
.sys-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.sys-twin {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 800px) {
  .sys-twin, .sys-split { grid-template-columns: 1fr; }
}
.sys-flow.side { margin: 0; }
.sys-flow.side::before, .sys-flow.side::after { display: none; }
.core-lane .sys-lane-label { background: rgba(47,111,237,0.12); }
.iot-lane .sys-lane-label { background: rgba(47,111,237,0.1); }
.data-lane .sys-lane-label { background: rgba(255,255,255,0.55); }
.ai-lane .sys-lane-label { background: rgba(30,79,196,0.12); }

.sys-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  margin: 14px 0 0;
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-weight: 600;
}
.sys-legend i {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 4px;
  margin-right: 6px;
  vertical-align: -1px;
  border: 1px solid rgba(255,255,255,0.7);
}
.sys-legend .lg.core { background: rgba(91,142,245,0.55); }
.sys-legend .lg.iot { background: rgba(47,111,237,0.35); }
.sys-legend .lg.data { background: rgba(255,255,255,0.85); }
.sys-legend .lg.ai { background: rgba(30,79,196,0.45); }
.sys-legend .lg.ext { background: rgba(200,214,235,0.9); }
.sys-notes { margin-top: 14px; }


/* ── Header refine ── */
.top.glass-bar {
  padding: 8px 0;
  background: rgba(255,255,255,0.42);
  border-bottom: 1px solid rgba(255,255,255,0.65);
  box-shadow: 0 10px 30px -24px rgba(30,60,120,0.45);
}
.top-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
  min-height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand-copy {
  display: grid;
  gap: 0;
  line-height: 1.15;
}
.brand-copy strong {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--blue-deep);
  letter-spacing: -0.02em;
}
.brand-copy em {
  font-style: normal;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.brand-icon-sm {
  width: 36px;
  height: 36px;
  border-radius: 11px;
}
.doc-nav {
  justify-content: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  background: rgba(255,255,255,0.35);
  border: 1px solid rgba(255,255,255,0.65);
  width: fit-content;
  margin: 0 auto;
}
.doc-nav a {
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  opacity: 1;
  color: var(--ink-soft);
}
.doc-nav a:hover {
  background: rgba(47,111,237,0.12);
  color: var(--blue-deep);
}
.who-pill {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--blue-deep);
  background: rgba(255,255,255,0.5);
  border: 1px solid rgba(255,255,255,0.75);
  border-radius: 999px;
  padding: 6px 12px;
}
@media (max-width: 980px) {
  .top-bar { grid-template-columns: 1fr auto; }
  .doc-nav { display: none; }
}

/* ── Infra tech tree ── */
.infra-tree-head { margin-top: 36px; }
.infra-tech { padding: 22px 18px; display: grid; gap: 16px; }
.it-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 10px;
  align-items: stretch;
}
.it-row.twin {
  grid-template-columns: 1fr 1fr;
}
@media (max-width: 900px) {
  .it-row { grid-template-columns: 1fr; }
  .it-arrow { display: none; }
  .it-row.twin { grid-template-columns: 1fr; }
}
.it-stage {
  background: rgba(255,255,255,0.45);
  border: 1px solid rgba(255,255,255,0.75);
  border-radius: 16px;
  padding: 16px 16px 14px;
}
.it-stage.hot {
  background: linear-gradient(160deg, rgba(91,142,245,0.2), rgba(47,111,237,0.1));
  border-color: rgba(47,111,237,0.35);
}
.it-stage.ai {
  background: linear-gradient(160deg, rgba(30,79,196,0.16), rgba(91,142,245,0.1));
  border-color: rgba(30,79,196,0.28);
}
.it-stage.wide { grid-column: 1 / -1; }
.it-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(145deg, var(--blue-soft), var(--blue-deep));
  border-radius: 999px;
  padding: 3px 9px;
  margin-bottom: 8px;
}
.it-stage h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  color: var(--blue-deep);
}
.it-stage ul {
  margin: 0;
  padding-left: 1.05em;
  color: var(--ink-soft);
  font-size: 0.86rem;
}
.it-stage li { margin: 0.28em 0; }
.it-arrow {
  display: grid;
  place-items: center;
  font-weight: 800;
  color: var(--blue);
  font-size: 1.2rem;
}
.it-branch-label {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--blue);
  margin: 2px 0;
}
.it-ai-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
@media (max-width: 700px) {
  .it-ai-grid { grid-template-columns: 1fr 1fr; }
}
.it-ai-grid span {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
  background: rgba(255,255,255,0.45);
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: 12px;
  padding: 10px 12px;
  text-align: center;
}
.it-foot {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(47,111,237,0.08);
  border: 1px solid rgba(47,111,237,0.2);
  font-size: 0.88rem;
  color: var(--ink-soft);
}
.it-foot strong { color: var(--blue-deep); font-size: 0.8rem; }

.infra-map {
  margin-top: 14px;
  padding: 18px 16px 20px;
}
.infra-map h3 {
  margin: 0 0 14px;
  font-size: 0.98rem;
  color: var(--blue-deep);
}
.topo {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: stretch;
  justify-content: space-between;
}
.topo-col {
  flex: 1 1 110px;
  display: grid;
  gap: 6px;
  text-align: center;
  padding: 12px 10px;
  border-radius: 14px;
  background: rgba(255,255,255,0.45);
  border: 1px solid rgba(255,255,255,0.7);
}
.topo-col.hot {
  background: linear-gradient(160deg, rgba(91,142,245,0.18), rgba(47,111,237,0.1));
  border-color: rgba(47,111,237,0.35);
}
.topo-col strong {
  font-size: 0.78rem;
  color: var(--blue-deep);
  margin-bottom: 2px;
}
.topo-col span {
  font-size: 0.78rem;
  color: var(--ink-soft);
  font-weight: 600;
}
.topo-join {
  display: grid;
  place-items: center;
  color: var(--blue);
  font-weight: 800;
  min-width: 18px;
}

/* ── Site footer / copyright ── */
.site-foot {
  margin-top: 24px;
  padding: 22px 0 28px;
  border-top: 1px solid rgba(255,255,255,0.55);
  background: rgba(255,255,255,0.28);
  backdrop-filter: blur(12px);
}
.foot-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}
.foot-brand {
  display: grid;
  gap: 2px;
}
.foot-brand strong {
  font-size: 0.9rem;
  color: var(--blue-deep);
}
.foot-brand span,
.foot-contact span {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 500;
}
.foot-contact {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  font-weight: 600;
}
.foot-contact a {
  color: var(--blue-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(30,79,196,0.25);
}
.foot-contact a:hover { border-bottom-color: var(--blue-deep); }
.auth-body { align-content: center; }
.auth-foot {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  margin: 0;
  background: rgba(255,255,255,0.35);
}
.auth-foot .foot-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px;
}
.auth-body .auth-card { margin-bottom: 72px; }