:root {
  --bg: #05070e;
  --bg-soft: #080d18;
  --panel: rgba(255, 255, 255, 0.035);
  --panel-hover: rgba(255, 255, 255, 0.06);
  --line: rgba(110, 200, 255, 0.16);
  --line-strong: rgba(110, 220, 255, 0.36);
  --text: #e9f3ff;
  --dim: #8ba3bf;
  --dimmer: #5d7b96;
  --cyan: #4ff0ff;
  --magenta: #ff4dd8;
  --lime: #b6ff5c;
  --radius: 16px;
  --font: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(90, 180, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(90, 180, 255, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 12%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 12%, #000 0%, transparent 78%);
}

/* ---------------- nav ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 16px clamp(20px, 5vw, 64px);
  backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(5, 7, 14, 0.9), rgba(5, 7, 14, 0.55));
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.14em;
  font-size: 14px;
}

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--cyan), var(--magenta));
  box-shadow: 0 0 14px rgba(79, 240, 255, 0.75);
  transform: rotate(45deg);
}
.brand-mark.small { width: 10px; height: 10px; }

.brand-text b { color: var(--cyan); font-weight: 800; }

.nav-links {
  display: flex;
  gap: 22px;
  margin-left: 8px;
  flex: 1;
}

.nav-links a {
  color: var(--dim);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--cyan); }

.nav-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
}

.nav-status .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--dim);
  box-shadow: 0 0 10px currentColor;
  animation: pulse 1.8s ease-in-out infinite;
}
.nav-status.live { color: var(--lime); border-color: rgba(182, 255, 92, 0.4); }
.nav-status.live .dot { background: var(--lime); }
.nav-status.demo { color: var(--magenta); border-color: rgba(255, 77, 216, 0.4); }
.nav-status.demo .dot { background: var(--magenta); }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }

/* ---------------- layout ---------------- */
main {
  position: relative;
  z-index: 1;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 40px) 40px;
}

/* ---------------- hero ---------------- */
.hero {
  padding: clamp(48px, 10vh, 104px) 0 clamp(40px, 7vh, 72px);
  text-align: center;
}

.hero-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 7px 16px;
  background: rgba(79, 240, 255, 0.06);
  margin-bottom: 26px;
}

.hero-title {
  margin: 0;
  font-size: clamp(44px, 9vw, 98px);
  line-height: 1.04;
  letter-spacing: 0.02em;
  font-weight: 900;
}

.glitch {
  position: relative;
  display: inline-block;
  padding: 0 0.06em;
  background: linear-gradient(180deg, #ffffff 8%, #a9d8ff 54%, #4ff0ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 60px rgba(79, 240, 255, 0.25);
}
.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  background: inherit;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0.85;
  pointer-events: none;
}
.glitch::before { color: var(--magenta); animation: glitch-a 4.5s infinite steps(2); mix-blend-mode: screen; }
.glitch::after { color: var(--cyan); animation: glitch-b 5.5s infinite steps(2); mix-blend-mode: screen; }

@keyframes glitch-a {
  0%, 92%, 100% { transform: translate(0, 0); opacity: 0; }
  93% { transform: translate(-4px, 1px); opacity: 0.5; }
  95% { transform: translate(3px, -2px); opacity: 0.35; }
  97% { transform: translate(-2px, 0); opacity: 0.45; }
}
@keyframes glitch-b {
  0%, 90%, 100% { transform: translate(0, 0); opacity: 0; }
  91% { transform: translate(4px, -1px); opacity: 0.4; }
  94% { transform: translate(-3px, 2px); opacity: 0.3; }
}

.hero-en {
  margin: 14px 0 0;
  font-family: var(--mono);
  font-size: clamp(11px, 1.6vw, 14px);
  letter-spacing: 0.5em;
  text-indent: 0.5em;
  color: var(--dim);
  text-transform: uppercase;
}

.hero-sub {
  min-height: 3.2em;
  max-width: 660px;
  margin: 22px auto 0;
  font-size: clamp(15px, 2.2vw, 18px);
  color: var(--dim);
}
.hero-sub .caret {
  display: inline-block;
  width: 9px;
  height: 1.05em;
  margin-left: 3px;
  background: var(--cyan);
  vertical-align: -0.16em;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 34px;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.25s ease, background 0.25s ease, color 0.2s ease;
}

.btn-primary {
  background: linear-gradient(100deg, var(--cyan), #7ea8ff 60%, var(--magenta));
  color: #04060c;
  box-shadow: 0 8px 34px rgba(79, 240, 255, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 44px rgba(79, 240, 255, 0.55), 0 0 0 4px rgba(79, 240, 255, 0.12);
}
.btn-arrow { transition: transform 0.2s ease; }
.btn-primary:hover .btn-arrow { transform: translateY(3px); }

.btn-ghost {
  color: var(--text);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
}
.btn-ghost:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 30px rgba(79, 240, 255, 0.2) inset;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: clamp(24px, 6vw, 64px);
  margin-top: clamp(36px, 6vh, 60px);
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-num {
  font-family: var(--mono);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  color: var(--cyan);
  text-shadow: 0 0 26px rgba(79, 240, 255, 0.4);
}
.stat-label { font-size: 12px; letter-spacing: 0.16em; color: var(--dim); text-transform: uppercase; }

/* ---------------- sections ---------------- */
.section { padding: clamp(48px, 9vh, 92px) 0 0; }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--magenta);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.section-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.refresh {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.refresh:hover { color: var(--cyan); border-color: var(--cyan); }
.refresh:disabled { opacity: 0.4; cursor: progress; }

/* ---------------- news cards ---------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.card {
  position: relative;
  padding: 22px 22px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}
.card::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent 70%);
  opacity: 0.5;
  transition: opacity 0.22s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  background: var(--panel-hover);
}
.card:hover::before { opacity: 1; }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.card-date {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.tag-pin {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--magenta);
  border: 1px solid rgba(255, 77, 216, 0.4);
  border-radius: 999px;
  padding: 2px 9px;
  background: rgba(255, 77, 216, 0.08);
}

.card-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
}

.card-body {
  margin: 0;
  font-size: 14px;
  color: var(--dim);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------------- versions ---------------- */
.versions { display: flex; flex-direction: column; gap: 10px; }

.version-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 18px;
  padding: 16px 20px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
.version-row:hover {
  border-color: var(--line-strong);
  background: var(--panel-hover);
  transform: translateX(4px);
}

.version-name {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  min-width: 96px;
}

.version-notes { font-size: 13.5px; color: var(--dim); }

.version-date {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--dim);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.dl {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  color: #04060c;
  background: var(--lime);
  border-radius: 999px;
  padding: 8px 16px;
  white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.22s ease;
}
.dl:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(182, 255, 92, 0.35); }
.dl.latest { background: linear-gradient(100deg, var(--cyan), var(--lime)); }
.dl.disabled {
  background: transparent;
  color: var(--dim);
  border: 1px solid var(--line);
  cursor: not-allowed;
  box-shadow: none;
}

/* ---------------- about ---------------- */
.about-inner {
  padding: clamp(26px, 4vw, 44px);
  border-radius: 22px;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 12% 0%, rgba(79, 240, 255, 0.1), transparent 46%),
    radial-gradient(circle at 92% 100%, rgba(255, 77, 216, 0.1), transparent 46%),
    var(--panel);
}
.about p { color: var(--dim); font-size: 15px; max-width: 760px; }
.about b { color: var(--text); }

.feature-list {
  list-style: none;
  padding: 0;
  margin: 22px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 10px 24px;
}
.feature-list li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  color: var(--dim);
}
.feature-list li span { color: var(--cyan); }

.about-note {
  margin-top: 26px;
  padding: 12px 16px;
  border-left: 2px solid var(--magenta);
  background: rgba(255, 77, 216, 0.06);
  border-radius: 0 10px 10px 0;
  font-size: 13px;
  color: var(--dim);
}

/* ---------------- footer ---------------- */
.footer {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 26px clamp(20px, 5vw, 64px);
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--dim);
}
.footer-left, .footer-right { display: flex; align-items: center; gap: 10px; }
.badge {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 10px;
  text-transform: uppercase;
}

/* ---------------- states ---------------- */
.skeleton {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
  min-height: 118px;
}
.skeleton.row { min-height: 62px; border-radius: 12px; }
.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(120, 200, 255, 0.1), transparent);
  transform: translateX(-100%);
  animation: shimmer 1.4s infinite;
}
@keyframes shimmer { 100% { transform: translateX(100%); } }

.empty, .error {
  grid-column: 1 / -1;
  padding: 34px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--dim);
  font-size: 14px;
}
.error { border-color: rgba(255, 120, 120, 0.4); color: #ffb4b4; }
.error code {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--magenta);
  display: block;
  margin-top: 8px;
  word-break: break-all;
}

/* ---------------- responsive ---------------- */
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-status { margin-left: auto; }
  .version-row {
    grid-template-columns: 1fr auto;
    grid-template-areas: "name dl" "notes notes" "date date";
    gap: 8px 12px;
  }
  .version-name { grid-area: name; }
  .dl { grid-area: dl; }
  .version-notes { grid-area: notes; }
  .version-date { grid-area: date; }
  .hero-stats { gap: 30px; }
  .footer { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
  html { scroll-behavior: auto; }
}