/* ==========================================================================
   Zhekai Li — technical dossier
   Aesthetic: instrument readout / engineering file. Near-black ground, hairline
   reticle grid, IBM Plex Mono for every label and heading, a single sodium-amber
   signal colour. Screenshots carry the visual weight; the chrome stays quiet.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@300;400;500&display=swap');

:root {
  --ink:        #07080a;
  --panel:      #0d0f12;
  --panel-2:    #12151a;
  --rule:       #1c2128;
  --rule-lit:   #2b323c;
  --text:       #d5dae1;
  --text-dim:   #79828e;
  --text-faint: #4d555f;
  --signal:     #ffb020;
  --signal-dim: #9a6b13;
  --crit:       #e0575b;

  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;

  --rail: 232px;
  --pad: clamp(20px, 4vw, 64px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* reticle grid + vignette ------------------------------------------------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.022) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size: 48px 48px;
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(ellipse at 50% 0%, transparent 40%, rgba(0,0,0,.55) 100%);
}

a { color: inherit; text-decoration: none; }

/* ---------- shared type ---------- */
.label {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.sig { color: var(--signal); }

/* ==========================================================================
   status bar
   ========================================================================== */
.statusbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  height: 30px;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 0 var(--pad);
  background: rgba(7,8,10,.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.statusbar .dot {
  width: 6px; height: 6px;
  background: var(--signal);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--signal);
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: .28 } }
.statusbar .spacer { margin-left: auto; }
.statusbar .hide-sm { display: none; }
@media (min-width: 900px) { .statusbar .hide-sm { display: inline; } }

/* ==========================================================================
   layout
   ========================================================================== */
.shell {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: 30px var(--pad) 0;
}

/* left index rail (desktop) */
.rail {
  display: none;
  position: fixed;
  top: 96px;
  width: var(--rail);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
}
@media (min-width: 1180px) {
  .rail { display: block; }
  .body-col { margin-left: calc(var(--rail) + 48px); }
}
.rail a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  color: var(--text-faint);
  border-left: 1px solid var(--rule);
  padding-left: 14px;
  transition: color .18s, border-color .18s;
}
.rail a:hover { color: var(--text); border-color: var(--signal); }
.rail a .num { color: var(--signal-dim); font-size: 10px; }
.rail .rail-meta {
  margin-top: 26px; padding-left: 15px;
  color: var(--text-faint); font-size: 10px; line-height: 2;
}

/* ==========================================================================
   hero
   ========================================================================== */
.hero { padding: 74px 0 68px; border-bottom: 1px solid var(--rule); }

.hero .eyebrow {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 26px;
}
.hero .eyebrow::after {
  content: ''; flex: 1; height: 1px;
  background: linear-gradient(to right, var(--rule-lit), transparent);
}

.hero h1 {
  font-family: var(--mono);
  font-weight: 600;
  /* mono is wide: "Platform Engineering" at 38px overflows a 390px viewport, so
     the floor has to drop further than a proportional face would need */
  font-size: clamp(27px, 7.6vw, 76px);
  overflow-wrap: break-word;
  line-height: .98;
  letter-spacing: -.03em;
  margin: 0 0 4px;
  text-transform: uppercase;
}
.hero h1 .thin { color: var(--text-faint); font-weight: 400; }

.hero .role {
  font-family: var(--mono);
  font-size: clamp(12px, 1.5vw, 14px);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 18px 0 30px;
}

.hero .lede {
  max-width: 66ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.72;
  color: #b6bcc5;
}
.hero .lede strong { color: var(--text); font-weight: 500; }

/* metric strip */
.metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 46px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
@media (min-width: 700px) { .metrics { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1000px) { .metrics { grid-template-columns: repeat(6, 1fr); } }
.metric { background: var(--ink); padding: 16px 16px 14px; }
.metric .v {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 500;
  color: var(--signal);
  line-height: 1;
  letter-spacing: -.02em;
}
.metric .k {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-top: 9px;
}

/* ==========================================================================
   sections
   ========================================================================== */
section.block { padding: 78px 0; border-bottom: 1px solid var(--rule); }

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 40px;
}
.sec-head .no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--signal);
}
.sec-head h2 {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(17px, 2.4vw, 23px);
  letter-spacing: .04em;
  text-transform: uppercase;
  margin: 0;
}
.sec-head .tail {
  flex: 1; height: 1px;
  background: var(--rule);
}
.sec-head .count {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--text-faint);
}

/* ---------- system cards ---------- */
.systems { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }

.sys {
  position: relative;
  background: var(--panel);
  padding: 26px clamp(20px, 3vw, 34px);
  display: grid;
  gap: 6px 34px;
  transition: background .2s;
}
@media (min-width: 860px) {
  .sys { grid-template-columns: minmax(0, 1fr) 268px; }
}
.sys:hover { background: var(--panel-2); }
.sys:hover .sys-name { color: var(--signal); }

/* registration ticks */
.sys::before, .sys::after {
  content: '';
  position: absolute;
  width: 7px; height: 7px;
  border-color: var(--rule-lit);
  border-style: solid;
  opacity: 0;
  transition: opacity .2s;
}
.sys::before { top: 9px; left: 9px; border-width: 1px 0 0 1px; }
.sys::after  { bottom: 9px; right: 9px; border-width: 0 1px 1px 0; }
.sys:hover::before, .sys:hover::after { opacity: 1; border-color: var(--signal-dim); }

.sys-id {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--text-faint);
  margin-bottom: 8px;
}
.sys-name {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 16.5px;
  letter-spacing: .01em;
  margin: 0 0 10px;
  transition: color .2s;
}
.sys p { margin: 0; color: #a8b0ba; font-size: 14.5px; line-height: 1.68; max-width: 62ch; }
.sys p .hl { color: var(--text); font-weight: 500; }

.sys-side { align-self: start; }
@media (max-width: 859px) { .sys-side { margin-top: 16px; } }

.stack { display: flex; flex-wrap: wrap; gap: 5px; }
.stack span {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .07em;
  color: var(--text-dim);
  border: 1px solid var(--rule-lit);
  padding: 3px 7px;
  white-space: nowrap;
}
.sys-figure {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--signal);
  text-transform: uppercase;
}

/* ---------- report gallery ---------- */
.gallery { display: grid; gap: 22px; }
@media (min-width: 780px) { .gallery { grid-template-columns: repeat(2, 1fr); } }

.shot {
  position: relative;
  border: 1px solid var(--rule);
  background: var(--panel);
  overflow: hidden;
  transition: border-color .22s, transform .22s;
}
.shot:hover { border-color: var(--rule-lit); transform: translateY(-2px); }
/* These reports are light documents on a dark board. At rest they are damped so
   they read as texture and do not out-shout the page; hover restores them to
   full fidelity and makes the screenshot the subject. */
.shot .frame {
  position: relative;
  overflow: hidden;
  background: #0b0d10;
}
.shot .frame::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(7,8,10,.30), rgba(7,8,10,.62));
  transition: opacity .28s;
  pointer-events: none;
}
.shot:hover .frame::after { opacity: 0; }
.shot img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(.62) contrast(.96) brightness(.9);
  transition: filter .28s, transform .6s cubic-bezier(.2,.7,.3,1);
}
.shot:hover img { filter: none; transform: scale(1.02); }

.shot .cap {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 16px 14px;
  border-top: 1px solid var(--rule);
  background: var(--ink);
}
.shot .cap .t {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text);
}
.shot .cap .d {
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--text-dim);
  margin-left: auto;
  text-align: right;
}
.shot .flag {
  position: absolute;
  top: 10px; left: 10px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--signal);
  background: rgba(7,8,10,.82);
  border: 1px solid var(--signal-dim);
  padding: 3px 7px;
  backdrop-filter: blur(4px);
}

.redaction-note {
  margin-top: 26px;
  border-left: 2px solid var(--signal-dim);
  padding: 12px 0 12px 18px;
  color: var(--text-dim);
  font-size: 13.5px;
  max-width: 78ch;
}
.redaction-note code {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--signal);
}

/* ---------- profile ---------- */
.profile { display: grid; gap: 46px; }
@media (min-width: 940px) { .profile { grid-template-columns: minmax(0,1.35fr) minmax(0,1fr); gap: 64px; } }
.profile p { color: #adb5bf; max-width: 64ch; }
.profile p strong { color: var(--text); font-weight: 500; }

.spec { border-top: 1px solid var(--rule); }
.spec .row {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 13.5px;
}
.spec .row .k {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding-top: 3px;
}
.spec .row .v { color: #b9c0c9; }

/* ---------- contact ---------- */
.contact { padding: 74px 0 92px; }
.contact h2 {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(24px, 4.4vw, 44px);
  letter-spacing: -.01em;
  text-transform: uppercase;
  margin: 0 0 30px;
}
.links { display: flex; flex-wrap: wrap; gap: 10px; }
.links a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .13em;
  text-transform: uppercase;
  border: 1px solid var(--rule-lit);
  padding: 11px 18px;
  color: var(--text-dim);
  transition: color .18s, border-color .18s, background .18s;
}
.links a:hover { color: var(--ink); background: var(--signal); border-color: var(--signal); }

footer {
  border-top: 1px solid var(--rule);
  padding: 22px 0 40px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
footer .spacer { margin-left: auto; }

/* ==========================================================================
   entrance
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  .rise { opacity: 0; transform: translateY(14px); animation: rise .78s cubic-bezier(.2,.7,.25,1) forwards; }
  @keyframes rise { to { opacity: 1; transform: none; } }
  .d1 { animation-delay: .05s } .d2 { animation-delay: .13s }
  .d3 { animation-delay: .21s } .d4 { animation-delay: .29s }
  .d5 { animation-delay: .37s } .d6 { animation-delay: .45s }
}