/* ============================================================
   Zhengdong Hong — personal homepage
   Handcrafted vanilla CSS. Light-first, dark mode via [data-theme].
   ============================================================ */

:root {
  --bg: #fbfbfa;
  --bg-card: #ffffff;
  --text: #1c2024;
  --text-soft: #5b6572;
  --text-faint: #8b95a3;
  --accent: #015cab;
  --accent-soft: rgba(1, 92, 171, 0.08);
  --accent-border: rgba(1, 92, 171, 0.34);
  --hot: #be2828;
  --hot-soft: rgba(190, 40, 40, 0.08);
  --hot-border: rgba(190, 40, 40, 0.35);
  --line: #e5e8ec;
  --grid-line: rgba(1, 92, 171, 0.045);
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 4px 14px rgba(16, 24, 40, 0.05);
  --shadow-lift: 0 2px 4px rgba(16, 24, 40, 0.06), 0 10px 28px rgba(16, 24, 40, 0.10);
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --nav-h: 62px;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0e1116;
  --bg-card: #151b23;
  --text: #dde3ea;
  --text-soft: #9aa5b4;
  --text-faint: #6b7686;
  --accent: #5da9ec;
  --accent-soft: rgba(93, 169, 236, 0.10);
  --accent-border: rgba(93, 169, 236, 0.38);
  --hot: #ff8080;
  --hot-soft: rgba(255, 128, 128, 0.10);
  --hot-border: rgba(255, 128, 128, 0.38);
  --line: #242c37;
  --grid-line: rgba(120, 170, 220, 0.05);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 14px rgba(0, 0, 0, 0.25);
  --shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.4), 0 10px 28px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 18px); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* faint engineering grid over the whole page */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

::selection { background: var(--accent); color: #fff; }

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

img { max-width: 100%; }

.mono { font-family: var(--mono); }

/* ---------------------------------------------------------- */
/* Top navigation                                              */
/* ---------------------------------------------------------- */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.nav-inner {
  width: 100%;
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--text);
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand .zh {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.88rem;
  color: var(--accent);
  min-width: 3.3em;
  display: inline-block;
}
.brand .zh::after {
  content: "";
  display: inline-block;
  width: 8px; height: 1.05em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--accent);
  animation: caret-blink 1.1s steps(1) infinite;
}
@keyframes caret-blink { 50% { opacity: 0; } }

.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-soft);
  padding: 6px 10px;
  border-radius: 7px;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--accent); background: var(--accent-soft); text-decoration: none; }
.nav-links a.active { color: var(--accent); background: var(--accent-soft); }

.nav-cv {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff !important;
  background: var(--accent);
  padding: 6px 12px !important;
  border-radius: 7px;
}
.nav-cv:hover { filter: brightness(1.1); background: var(--accent) !important; }

.theme-toggle {
  border: 1px solid var(--line);
  background: var(--bg-card);
  color: var(--text-soft);
  width: 32px; height: 32px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent-border); }

/* ---------------------------------------------------------- */
/* Three-column shell                                          */
/* ---------------------------------------------------------- */

.shell {
  max-width: 1500px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 30px) 28px 0;
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr) 232px;
  gap: 42px;
}

.main {
  min-width: 0;
  max-width: 830px;
  width: 100%;
  margin: 0 auto;
}

/* ---------------------------------------------------------- */
/* Photo rails                                                 */
/* ---------------------------------------------------------- */

.rail {
  position: sticky;
  top: calc(var(--nav-h) + 20px);
  height: calc(100vh - var(--nav-h) - 40px);
  overflow: hidden;
  /* fade the track in/out at rail edges */
  -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 26px, #000 calc(100% - 26px), transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0, #000 26px, #000 calc(100% - 26px), transparent 100%);
}

.rail-track { will-change: transform; padding: 6px 2px; }

.rail-head {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin: 0 0 12px 2px;
}
.rail-head::before { content: "▸ "; color: var(--accent); }

.rail figure {
  margin: 0 0 16px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 11px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.rail figure:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); }

.rail img {
  display: block;
  width: 100%;
  height: auto;
  border-bottom: 1px solid var(--line);
}

.rail figcaption {
  padding: 8px 11px 9px;
  font-family: var(--mono);
  font-size: 0.68rem;
  line-height: 1.5;
  color: var(--text-soft);
}
.rail figcaption .idx {
  color: var(--accent);
  font-weight: 700;
  display: block;
  font-size: 0.64rem;
  letter-spacing: 0.1em;
}

.rail figure > a { display: block; }

/* clickable document teaser */
.doc-tease a { display: block; position: relative; color: inherit; }
.doc-tease a:hover { text-decoration: none; }
.doc-tease-overlay {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 40px 11px 10px;
  background: linear-gradient(180deg, transparent, rgba(10, 14, 20, 0.9) 62%);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.66rem;
  line-height: 1.55;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.doc-tease-overlay b { font-size: 0.7rem; letter-spacing: 0.02em; }
.doc-tease-overlay em { font-style: normal; font-weight: 700; color: #8ec4f4; }
.doc-tease a:hover .doc-tease-overlay em { text-decoration: underline; text-underline-offset: 3px; }

/* ---------------------------------------------------------- */
/* Sections                                                    */
/* ---------------------------------------------------------- */

section { margin: 0 0 46px; }

.sec-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 1.62rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 22px;
  color: var(--text);
}
.sec-title .no {
  font-family: var(--mono);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--accent);
}
.sec-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
  transform: translateY(-6px);
}

.sec-sub {
  margin: -14px 0 22px;
  color: var(--text-soft);
  font-size: 0.98rem;
}

/* ---------------------------------------------------------- */
/* Hero                                                        */
/* ---------------------------------------------------------- */

.hero { display: flex; gap: 34px; align-items: flex-start; margin-bottom: 30px; }

.hero-photo {
  flex: 0 0 208px;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  position: relative;
}
.hero-photo img { display: block; width: 100%; height: auto; }

.hero-body { min-width: 0; }

.hero-name {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 2px 0 2px;
}
.hero-name .zh-name {
  font-weight: 600;
  font-size: 1.5rem;
  color: var(--text-soft);
  margin-left: 12px;
  letter-spacing: 0.06em;
}

.hero-tagline {
  font-family: var(--mono);
  font-size: 0.86rem;
  color: var(--accent);
  margin: 6px 0 14px;
}
.hero-tagline .dim { color: var(--text-faint); }

.hero-role { color: var(--text-soft); font-size: 0.98rem; line-height: 1.55; margin: 0 0 16px; }
.hero-role b { color: var(--text); font-weight: 650; }

.hero-links { display: flex; flex-wrap: wrap; gap: 8px; }
.hero-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 11px;
  border: 1px solid var(--accent-border);
  border-radius: 7px;
  transition: background 0.2s, color 0.2s;
}
.hero-links a:hover { background: var(--accent); color: #fff; text-decoration: none; }

.hero-links a.cv-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 700;
}
.hero-links a.cv-primary:hover { filter: brightness(1.12); }

.bio p { margin: 0 0 14px; }
.bio .hl { background: linear-gradient(transparent 62%, var(--accent-soft) 62%); font-weight: 600; color: var(--text); }

/* terminal-comment style quote */
blockquote.term {
  margin: 20px 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 9px 9px 0;
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--text-soft);
  line-height: 1.6;
}
blockquote.term::before { content: "// "; color: var(--accent); font-weight: 700; }
blockquote.term .who { display: block; margin-top: 4px; color: var(--text-faint); font-size: 0.76rem; }

/* ---------------------------------------------------------- */
/* News                                                        */
/* ---------------------------------------------------------- */

.news { list-style: none; margin: 0; padding: 0; }
.news li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.95rem;
}
.news li:last-child { border-bottom: none; }
.news .d {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 5px;
  padding: 1px 7px;
}

/* ---------------------------------------------------------- */
/* Publications                                                */
/* ---------------------------------------------------------- */

.legend {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--text-faint);
  margin: -12px 0 20px;
}

.pub {
  display: grid;
  grid-template-columns: 252px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.pub:last-of-type { border-bottom: none; }

.pub-thumb {
  border: 1px solid var(--line);
  border-radius: 9px;
  overflow: hidden;
  background: var(--bg-card);
  box-shadow: var(--shadow);
}
.pub-thumb img { display: block; width: 100%; height: auto; }

.pub-title { font-size: 1.08rem; font-weight: 700; line-height: 1.35; margin: 0 0 5px; color: var(--text); }
.pub-title a { color: inherit; }
.pub-title a:hover { color: var(--accent); text-decoration: none; }

.pub-authors { font-size: 0.85rem; color: var(--text-soft); line-height: 1.5; margin: 0 0 7px; }
.pub-authors .me { font-weight: 800; color: var(--text); text-decoration: underline; text-underline-offset: 2.5px; }

.badges { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 7px; }

.badge {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2.5px 8px;
  border-radius: 5px;
  border: 1px solid var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent);
  line-height: 1.4;
}
.badge.hot { color: var(--hot); border-color: var(--hot-border); background: var(--hot-soft); }
.badge.dim { color: var(--text-soft); border-color: var(--line); background: transparent; }

.pub-links { display: flex; flex-wrap: wrap; gap: 5px; margin: 0 0 6px; }
.pub-links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 2px 8px;
}
.pub-links a:hover { border-color: var(--accent-border); background: var(--accent-soft); text-decoration: none; }

details.tldr { margin-top: 2px; }
details.tldr summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--accent);
  list-style: none;
  user-select: none;
}
details.tldr summary::-webkit-details-marker { display: none; }
details.tldr summary::before { content: "▸ "; }
details.tldr[open] summary::before { content: "▾ "; }
details.tldr p { margin: 5px 0 0; font-size: 0.87rem; color: var(--text-soft); line-height: 1.55; }

/* ---------------------------------------------------------- */
/* Robot systems                                               */
/* ---------------------------------------------------------- */

.sys-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

.sys-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.sys-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); }

.sys-card img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3.4;
  object-fit: cover;
  border-bottom: 1px solid var(--line);
}

.sys-body { padding: 12px 14px 14px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.sys-name { font-weight: 750; font-size: 0.98rem; line-height: 1.3; }
.sys-desc { font-size: 0.84rem; color: var(--text-soft); line-height: 1.5; flex: 1; }

.sys-stat {
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--hot);
  background: var(--hot-soft);
  border: 1px solid var(--hot-border);
  border-radius: 5px;
  padding: 2px 8px;
}

.fleet { margin-top: 8px; }
.fleet-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 8px;
}
.fleet-chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-soft);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 3px 9px;
  background: var(--bg-card);
}

.infra-list { margin: 14px 0 0; padding: 0; list-style: none; }
.infra-list li {
  position: relative;
  padding: 4px 0 4px 22px;
  font-size: 0.92rem;
  color: var(--text-soft);
}
.infra-list li::before {
  content: "▹";
  position: absolute;
  left: 2px;
  color: var(--accent);
  font-weight: 700;
}
.infra-list b { color: var(--text); font-weight: 650; }

/* ---------------------------------------------------------- */
/* Hardware                                                    */
/* ---------------------------------------------------------- */

.spotlight {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--accent-border);
  border-radius: 13px;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.spotlight-body { padding: 18px 20px; }
.spotlight-kicker {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--hot);
  margin: 0 0 6px;
}
.spotlight-title { font-size: 1.15rem; font-weight: 800; margin: 0 0 8px; line-height: 1.35; }
.spotlight-text { font-size: 0.9rem; color: var(--text-soft); margin: 0; line-height: 1.6; }
.spotlight-links { margin: 12px 0 0; }
.spotlight-links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 3px 9px;
}
.spotlight-links a:hover { border-color: var(--accent-border); background: var(--accent-soft); text-decoration: none; }

.spotlight-img { position: relative; min-height: 180px; }
.spotlight-img img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  border-left: 1px solid var(--line);
}

.hw-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.hw-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 13px 15px;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.hw-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lift); }

.hw-year {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
}
.hw-name { font-weight: 700; font-size: 0.94rem; margin: 3px 0 5px; line-height: 1.35; }
.hw-desc { font-size: 0.83rem; color: var(--text-soft); line-height: 1.5; margin: 0 0 8px; }
.hw-tags { display: flex; flex-wrap: wrap; gap: 5px; }
.hw-tags span {
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--text-faint);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
}

.fieldnotes { margin-top: 18px; font-size: 0.92rem; color: var(--text-soft); }

/* ---------------------------------------------------------- */
/* Experience / education timeline                             */
/* ---------------------------------------------------------- */

.xp { display: flex; flex-direction: column; gap: 14px; }

.xp-row {
  display: flex;
  gap: 16px;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 13px 16px;
  box-shadow: var(--shadow);
}

.xp-logo {
  flex: 0 0 74px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.xp-logo img { max-width: 74px; max-height: 56px; object-fit: contain; display: block; }
.xp-logo img.seal { width: 52px; height: 52px; border-radius: 50%; background: #fff; }
.xp-logo img.wordmark { background: #fff; border-radius: 8px; padding: 5px 7px; }
.logo-chip {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--accent);
  border: 1.5px solid var(--accent-border);
  border-radius: 9px;
  padding: 9px 10px;
  letter-spacing: 0.03em;
}

.xp-body { flex: 1; min-width: 0; }
.xp-top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.xp-role { font-weight: 750; font-size: 0.99rem; }
.xp-date { font-family: var(--mono); font-size: 0.74rem; color: var(--text-faint); white-space: nowrap; }
.xp-org { font-size: 0.9rem; color: var(--text-soft); margin-top: 1px; }
.xp-note { font-size: 0.84rem; color: var(--text-soft); margin-top: 3px; }
.xp-note a { font-weight: 600; }

/* ---------------------------------------------------------- */
/* Awards                                                      */
/* ---------------------------------------------------------- */

.awards { list-style: none; margin: 0; padding: 0; }
.awards li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.95rem;
}
.awards li:last-child { border-bottom: none; }
.awards .star { color: var(--hot); font-weight: 800; font-family: var(--mono); flex: 0 0 auto; }
.awards .yr { font-family: var(--mono); font-size: 0.76rem; color: var(--text-faint); margin-left: auto; white-space: nowrap; }
.awards b { font-weight: 700; }

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

.contact-grid { display: flex; gap: 26px; align-items: flex-start; }
.contact-text { flex: 1; min-width: 0; }

.qr-box { flex: 0 0 128px; text-align: center; }
.qr-box img { width: 128px; border-radius: 10px; border: 1px solid var(--line); display: block; }
.qr-box span { font-family: var(--mono); font-size: 0.68rem; color: var(--text-faint); }

.footer {
  border-top: 1px solid var(--line);
  margin-top: 20px;
  padding: 22px 0 34px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  line-height: 1.9;
  text-align: center;
}
.footer a { color: var(--text-soft); }

.footer .closing {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--text-soft);
  max-width: 640px;
  margin: 0 auto 18px;
  line-height: 1.7;
}

/* ---------------------------------------------------------- */
/* Reveal-on-scroll                                            */
/* ---------------------------------------------------------- */

.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .rail { overflow-y: auto; }
  .rail-track { transform: none !important; }
}

/* ---------------------------------------------------------- */
/* Responsive                                                  */
/* ---------------------------------------------------------- */

@media (max-width: 1180px) {
  .shell { display: block; }

  /* rails become horizontal film strips */
  .rail {
    position: static;
    height: auto;
    overflow: visible;
    -webkit-mask-image: none;
    mask-image: none;
    margin: 0 0 34px;
  }
  .rail-track {
    display: flex;
    gap: 14px;
    overflow-x: auto;
    padding: 4px 2px 12px;
    transform: none !important;
    scrollbar-width: thin;
  }
  .rail figure { flex: 0 0 210px; margin: 0; }
  .rail img { height: 150px; object-fit: cover; }
  #rail-right { margin-top: 34px; }
}

@media (max-width: 860px) {
  .sys-grid { grid-template-columns: 1fr; }
  .hw-grid { grid-template-columns: 1fr; }
  .spotlight { grid-template-columns: 1fr; }
  .spotlight-img { min-height: 210px; }
  .spotlight-img img { position: static; height: 210px; border-left: none; border-top: 1px solid var(--line); }
  .pub { grid-template-columns: 1fr; gap: 12px; }
  .pub-thumb { max-width: 420px; }
}

@media (max-width: 720px) {
  body { font-size: 15px; }
  .hero { flex-direction: column; gap: 20px; }
  .hero-photo { flex-basis: auto; width: 178px; }
  .hero-name { font-size: 1.9rem; }
  .hero-name .zh-name { display: block; margin: 4px 0 0; }
  .nav-inner { padding: 0 16px; gap: 10px; }
  .brand .zh { display: none; }
  .shell { padding-left: 16px; padding-right: 16px; }
  .contact-grid { flex-direction: column; }
  .xp-row { align-items: flex-start; }
  .xp-logo { flex-basis: 56px; }
}

/* ---------------------------------------------------------- */
/* Small components                                            */
/* ---------------------------------------------------------- */

.sys-specs {
  list-style: none;
  margin: 2px 0 6px;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  line-height: 1.75;
}
.sys-specs li::before { content: "— "; color: var(--accent); }

.pub-thumb { display: block; }
.pub-thumb video { display: block; width: 100%; height: auto; }

.spotlight-stat {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  padding: 18px 20px;
  border-left: 1px dashed var(--accent-border);
  font-family: var(--mono);
}
.spotlight-stat .big {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--hot);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.spotlight-stat .small { font-size: 0.72rem; color: var(--text-soft); }

@media (max-width: 860px) {
  .spotlight-stat { border-left: none; border-top: 1px dashed var(--accent-border); }
}