:root {
  color-scheme: dark;
  --bg: #000;
  --panel: #06110c;
  --panel-soft: #0b1712;
  --text: #d7ffe0;
  --muted: #91b89d;
  --green: #00ff66;
  --green-soft: #42d97d;
  --blue: #2563eb;
  --line: rgba(0, 255, 102, 0.22);
  --danger: #ff5c7a;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --contact-label-width: 150px;
  --mono: var(--font-mono);
  --sans: var(--font-sans);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.65;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(rgba(0, 255, 102, 0.04) 50%, transparent 50%);
  background-size: 100% 4px;
  opacity: 0.22;
  z-index: 20;
}

a {
  color: var(--green);
  text-decoration: none;
}

a:hover {
  color: #fff;
}

code {
  padding: 1px 5px;
  background: rgba(0, 255, 120, 0.08);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(12px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--green);
  color: var(--green);
  font-family: var(--font-mono);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  font-size: 0.92rem;
}

.lang-switch {
  border: 1px solid var(--blue);
  padding: 0.25rem 0.55rem;
  color: #fff;
}

.hero {
  min-height: 86vh;
  display: grid;
  align-items: center;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.94), rgba(0, 0, 0, 0.74) 43%, rgba(0, 0, 0, 0.25)),
    url("../images/hero-network-ops.jpg") center / cover no-repeat;
  border-bottom: 1px solid var(--line);
}

.hero-inner,
.section-inner {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.prompt {
  color: var(--green);
  font-family: var(--font-mono);
  margin: 0 0 0.75rem;
}

h1,
h2,
h3,
p {
  font-family: var(--font-sans);
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: 0;
}

h1 {
  max-width: 860px;
  font-size: clamp(2.2rem, 7vw, 5rem);
  color: #fff;
}

h2 {
  font-size: 1.65rem;
  color: #fff;
}

h3 {
  font-size: 1.05rem;
  color: var(--green);
}

.lead {
  max-width: 760px;
  margin: 0 0 1.35rem;
  color: var(--text);
  font-size: 1.08rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  border: 1px solid var(--green);
  background: #001d0b;
  color: #fff;
  padding: 0.65rem 1rem;
  font: inherit;
  cursor: pointer;
}

.button.secondary {
  border-color: var(--blue);
  background: #061029;
}

.button:hover,
button:hover {
  background: var(--green);
  color: #000;
}

.section {
  padding-block: 48px;
  padding-inline: 0;
  border-bottom: 1px solid var(--line);
}

.section-inner > h2 {
  margin-bottom: 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.item {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 1rem;
  min-height: 100%;
}

.sponsor-banner {
  margin-top: 1rem;
}

.item p,
.section p,
li {
  color: var(--muted);
}

.terminal {
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.78);
  font-family: var(--font-mono);
  padding: 1rem;
  overflow-x: auto;
}

.status-line {
  color: var(--green);
  font-family: var(--font-mono);
}

.cursor::after {
  content: "_";
  animation: blink 1s steps(2, start) infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.search-box,
.form-grid {
  display: grid;
  gap: 1rem;
}

.form-grid label {
  display: grid;
  grid-template-columns: var(--contact-label-width) minmax(0, 1fr);
  gap: 0.75rem;
  align-items: center;
}

.form-grid label:has(textarea) {
  align-items: start;
}

.form-grid input,
.form-grid textarea,
.form-grid select {
  min-width: 0;
}

.form-grid > .field-error,
.form-grid > button {
  margin-left: calc(var(--contact-label-width) + 0.75rem);
}

.form-grid > button {
  justify-self: start;
}

.search-box span,
.site-footer .uptime {
  font-family: var(--font-mono);
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  background: #020604;
  color: #fff;
  padding: 0.8rem;
  font: inherit;
}

input:invalid {
  box-shadow: none;
}

input[type="email"] {
  background-image: none;
}

input[type="email"]:invalid:placeholder-shown,
input[type="email"]:invalid:not(:focus):placeholder-shown {
  border-color: var(--line);
}

input[type="email"]:invalid:not(:focus):not(:placeholder-shown) {
  border-color: var(--danger);
}

textarea {
  min-height: 9rem;
  resize: vertical;
}

.field-error {
  color: var(--danger);
  min-height: 1.5rem;
}

.qr-card {
  display: grid;
  gap: 0.55rem;
  margin-top: 1rem;
  max-width: 240px;
}

.qr-card img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: #fff;
  padding: 0.35rem;
}

.qr-caption {
  margin: 0;
  font-size: 0.9rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
}

.site-footer a,
.social-link {
  display: inline-flex;
  align-items: center;
  min-width: 24px;
  min-height: 24px;
  padding: 4px 6px;
}

.social-icon {
  width: 1rem;
  height: 1rem;
  flex: 0 0 auto;
}

.results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.result-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.result-more {
  grid-column: 1 / -1;
  justify-self: center;
  width: auto;
  margin-top: 0.25rem;
}

.site-footer {
  padding: 2rem 1rem;
  background: #020604;
  color: var(--muted);
}

.footer-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.legal {
  max-width: 860px;
  margin: 0 auto;
  padding: 4rem 1.25rem;
  font-family: var(--sans);
}

.legal h1,
.legal h2 {
  color: #fff;
}

.legal p,
.legal li {
  color: #d8e5dc;
}

@media (max-width: 820px) {
  .section {
    padding-block: clamp(32px, 6vw, 48px);
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    gap: 0.55rem;
  }

  .hero {
    min-height: 78vh;
    background:
      linear-gradient(rgba(0, 0, 0, 0.88), rgba(0, 0, 0, 0.72)),
      url("../images/hero-network-ops.jpg") center / cover no-repeat;
  }

  .grid,
  .grid.two,
  .results {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .form-grid label {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .form-grid > .field-error,
  .form-grid > button {
    margin-left: 0;
  }
}