:root {
  --c4-bg: #070a12;
  --c4-bg2: #0b1020;
  --c4-panel: rgba(255, 255, 255, 0.06);
  --c4-panel2: rgba(255, 255, 255, 0.04);
  --c4-border: rgba(48, 213, 255, 0.18);
  --c4-border2: rgba(167, 139, 250, 0.16);
  --c4-text: #e6eaf2;
  --c4-muted: #a8b0c2;
  --c4-dim: #7e8798;
  --c4-cyan: #30d5ff;
  --c4-cyan2: #5ee7ff;
  --c4-purple: #a78bfa;
  --c4-danger: #ff4d6d;
  --c4-shadow: 0 18px 60px rgba(0, 0, 0, 0.45);
  --c4-glow: 0 0 0 1px rgba(48, 213, 255, 0.18), 0 18px 60px rgba(48, 213, 255, 0.12);
  --c4-radius: 16px;
  --c4-radius-sm: 12px;
  --c4-max: 1240px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--c4-text);
  background: radial-gradient(900px 600px at 18% 20%, rgba(48, 213, 255, 0.12), transparent 55%),
    radial-gradient(800px 600px at 82% 18%, rgba(167, 139, 250, 0.12), transparent 55%),
    radial-gradient(1000px 700px at 70% 82%, rgba(48, 213, 255, 0.08), transparent 55%),
    linear-gradient(180deg, var(--c4-bg), #060814 55%, #050711);
  overflow-x: hidden;
}

a {
  color: inherit;
}

.c4-bgGrid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, rgba(48, 213, 255, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(48, 213, 255, 0.05) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.28;
  mask-image: radial-gradient(600px 600px at 40% 20%, #000 0%, transparent 70%);
}

.c4-container {
  width: 100%;
  max-width: var(--c4-max);
  margin: 0 auto;
  padding: 0 24px;
}

.c4-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 14px 0;
  backdrop-filter: blur(14px);
  background: rgba(7, 10, 18, 0.55);
  border-bottom: 1px solid rgba(48, 213, 255, 0.10);
  transition: background 220ms ease, border-color 220ms ease;
}

.c4-header.isScrolled {
  background: rgba(7, 10, 18, 0.82);
  border-bottom-color: rgba(48, 213, 255, 0.18);
}

.c4-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.c4-brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  text-decoration: none;
}

.c4-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: radial-gradient(14px 14px at 30% 30%, rgba(94, 231, 255, 0.9), rgba(48, 213, 255, 0) 70%),
    linear-gradient(135deg, rgba(48, 213, 255, 0.24), rgba(167, 139, 250, 0.18));
  border: 1px solid rgba(48, 213, 255, 0.22);
  box-shadow: 0 14px 40px rgba(48, 213, 255, 0.14);
  position: relative;
}

.c4-mark::after {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 8px;
  border: 1px solid rgba(167, 139, 250, 0.22);
  opacity: 0.8;
}

.c4-brandText {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.c4-brandName {
  font-weight: 750;
  letter-spacing: 0.2px;
  font-size: 16px;
}

.c4-brandTag {
  font-size: 12px;
  color: var(--c4-dim);
}

.c4-navRight {
  display: flex;
  align-items: center;
  gap: 14px;
}

.c4-menuToggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid rgba(48, 213, 255, 0.18);
  background: rgba(255, 255, 255, 0.04);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
  color: var(--c4-text);
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}

.c4-menuToggle span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 99px;
  background: rgba(230, 234, 242, 0.9);
  transition: transform 180ms ease, opacity 180ms ease;
}

.c4-menuToggle.isOpen span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.c4-menuToggle.isOpen span:nth-child(2) {
  opacity: 0;
}

.c4-menuToggle.isOpen span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.c4-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.c4-mobilePanel {
  display: none;
}

.c4-link {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 14px;
  border-radius: 12px;
  text-decoration: none;
  white-space: nowrap;
  color: var(--c4-muted);
  border: 1px solid transparent;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.c4-link:hover {
  color: var(--c4-text);
  background: rgba(48, 213, 255, 0.06);
  border-color: rgba(48, 213, 255, 0.12);
}

.c4-link.isActive {
  color: var(--c4-text);
  background: rgba(48, 213, 255, 0.08);
  border-color: rgba(48, 213, 255, 0.18);
}

.c4-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  padding: 0 16px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 650;
  letter-spacing: 0.2px;
  border: 1px solid rgba(48, 213, 255, 0.18);
  background: rgba(255, 255, 255, 0.04);
  color: var(--c4-text);
  white-space: nowrap;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
}

.c4-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.34);
  border-color: rgba(48, 213, 255, 0.28);
  background: rgba(48, 213, 255, 0.06);
}

.c4-btnPrimary {
  border-color: rgba(48, 213, 255, 0.30);
  background: linear-gradient(135deg, rgba(48, 213, 255, 0.98), rgba(94, 231, 255, 0.92));
  color: #03121a;
  box-shadow: 0 14px 40px rgba(48, 213, 255, 0.22);
}

.c4-btnPrimary:hover {
  box-shadow: 0 18px 54px rgba(48, 213, 255, 0.30);
}

.c4-select {
  height: 40px;
  border-radius: 12px;
  padding: 0 12px;
  color: var(--c4-text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(48, 213, 255, 0.16);
  outline: none;
  white-space: nowrap;
}

.c4-btn.isDisabled,
.c4-btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.c4-btnDanger {
  border-color: rgba(255, 77, 109, 0.28);
  background: rgba(255, 77, 109, 0.08);
}

.c4-btnDanger:hover {
  border-color: rgba(255, 77, 109, 0.40);
  background: rgba(255, 77, 109, 0.12);
}

.c4-btnBlock {
  width: 100%;
}

.c4-authWrap {
  max-width: 520px;
  margin: 0 auto;
}

.c4-form {
  display: grid;
  gap: 14px;
}

.c4-field {
  display: grid;
  gap: 8px;
}

.c4-label {
  font-size: 13px;
  color: var(--c4-dim);
  font-weight: 650;
}

.c4-input {
  height: 50px;
  border-radius: 12px;
  padding: 0 14px;
  color: var(--c4-text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(48, 213, 255, 0.16);
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.c4-input:focus {
  border-color: rgba(48, 213, 255, 0.30);
  box-shadow: 0 0 0 4px rgba(48, 213, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
}

.c4-formRow {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.c4-formRow .c4-input {
 
  
}

.c4-help {
  font-size: 12px;
  color: var(--c4-dim);
  line-height: 1.6;
}

.c4-captcha {
  height: 50px;
  min-width: 120px;
  border-radius: 12px;
  border: 1px solid rgba(48, 213, 255, 0.16);
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
}

.c4-alert {
  border-radius: 14px;
  padding: 12px 14px;
  border: 1px solid rgba(48, 213, 255, 0.18);
  background: rgba(255, 255, 255, 0.03);
  color: rgba(230, 234, 242, 0.92);
}

.c4-alertError {
  border-color: rgba(255, 77, 109, 0.30);
  background: rgba(255, 77, 109, 0.08);
}

.c4-alertSuccess {
  border-color: rgba(48, 213, 255, 0.30);
  background: rgba(48, 213, 255, 0.08);
}

.c4-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.6px;
  border: 1px solid rgba(48, 213, 255, 0.18);
  background: rgba(48, 213, 255, 0.10);
  color: rgba(230, 234, 242, 0.94);
}

.c4-badge-new {
  border-color: rgba(167, 139, 250, 0.26);
  background: rgba(167, 139, 250, 0.12);
}

.c4-badge-hot {
  border-color: rgba(255, 77, 109, 0.28);
  background: rgba(255, 77, 109, 0.12);
}

.c4-metaPill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 12px;
  color: rgba(230, 234, 242, 0.86);
  border: 1px solid rgba(48, 213, 255, 0.16);
  background: rgba(255, 255, 255, 0.03);
}

.c4-metaPill.isDanger {
  border-color: rgba(255, 77, 109, 0.28);
  background: rgba(255, 77, 109, 0.08);
}

.c4-updates {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  gap: 10px;
}

.c4-update {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
  color: var(--c4-muted);
  line-height: 1.7;
}

.c4-updateTag {
  height: 22px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(48, 213, 255, 0.18);
  background: rgba(48, 213, 255, 0.10);
  color: rgba(230, 234, 242, 0.92);
}

.c4-updateTag-fix {
  border-color: rgba(255, 77, 109, 0.30);
  background: rgba(255, 77, 109, 0.10);
}

.c4-updateTag-optimize {
  border-color: rgba(48, 213, 255, 0.28);
  background: rgba(48, 213, 255, 0.10);
}

.c4-updateTag-new {
  border-color: rgba(167, 139, 250, 0.28);
  background: rgba(167, 139, 250, 0.12);
}

.c4-kv {
  border-radius: 14px;
  border: 1px solid rgba(48, 213, 255, 0.10);
  background: rgba(255, 255, 255, 0.02);
  padding: 12px;
  display: grid;
  gap: 10px;
}

.c4-kvRow {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 10px;
  align-items: start;
}

.c4-kvKey {
  font-size: 12px;
  color: var(--c4-dim);
}

.c4-kvVal {
  font-size: 13px;
  color: rgba(230, 234, 242, 0.92);
  word-break: break-word;
}

.c4-prose {
  color: rgba(230, 234, 242, 0.90);
  line-height: 1.8;
}

.c4-prose p {
  margin: 0 0 12px;
  color: var(--c4-muted);
}

.c4-prose h1,
.c4-prose h2,
.c4-prose h3 {
  margin: 18px 0 10px;
  color: rgba(230, 234, 242, 0.96);
}

.c4-code {
  margin: 10px 0 14px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(48, 213, 255, 0.14);
  background: rgba(255, 255, 255, 0.02);
  color: rgba(230, 234, 242, 0.90);
  overflow: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  line-height: 1.6;
}

.c4-hero {
  padding: 70px 0 28px;
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  position: relative;
}

.c4-heroGrid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 28px;
  align-items: center;
}

.c4-h1 {
  font-size: 62px;
  line-height: 1.05;
  margin: 0 0 14px;
  letter-spacing: -0.6px;
  background: linear-gradient(45deg, rgba(230, 234, 242, 0.98), rgba(48, 213, 255, 0.95), rgba(167, 139, 250, 0.92));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.c4-subtitle {
  margin: 0;
  color: var(--c4-muted);
  font-size: 18px;
  line-height: 1.65;
  max-width: 52ch;
}

.c4-chips {
  margin-top: 22px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.c4-chip {
  display: inline-flex;
  height: 34px;
  align-items: center;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(48, 213, 255, 0.18);
  background: rgba(255, 255, 255, 0.03);
  color: rgba(230, 234, 242, 0.88);
  font-size: 13px;
}

.c4-cta {
  margin-top: 26px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.c4-heroVisual {
  border-radius: 24px;
  border: 1px solid rgba(48, 213, 255, 0.16);
  background: radial-gradient(900px 540px at 35% 20%, rgba(48, 213, 255, 0.20), transparent 55%),
    radial-gradient(900px 540px at 70% 75%, rgba(167, 139, 250, 0.16), transparent 58%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  box-shadow: var(--c4-glow);
  overflow: hidden;
  position: relative;
  min-height: 420px;
}

.c4-heroVisual::before {
  content: "";
  position: absolute;
  inset: -40px;
  background: conic-gradient(from 230deg, rgba(48, 213, 255, 0.0), rgba(48, 213, 255, 0.26), rgba(167, 139, 250, 0.18), rgba(48, 213, 255, 0.0));
  filter: blur(18px);
  opacity: 0.7;
  transform: rotate(0deg);
  animation: c4Spin 18s linear infinite;
}

.c4-heroVisual::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 18% 30%, rgba(94, 231, 255, 0.24), transparent 44%),
    radial-gradient(circle at 76% 30%, rgba(167, 139, 250, 0.20), transparent 46%),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0));
  opacity: 0.95;
}

.c4-visualInner {
  position: relative;
  z-index: 1;
  padding: 22px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 14px;
}

.c4-visualPanel {
  border-radius: 18px;
  border: 1px solid rgba(48, 213, 255, 0.18);
  background: rgba(7, 10, 18, 0.55);
  backdrop-filter: blur(12px);
  padding: 16px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.28);
}

.c4-visualTitle {
  font-size: 14px;
  color: rgba(230, 234, 242, 0.92);
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.c4-visualKpis {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.c4-kpi {
  border-radius: 14px;
  border: 1px solid rgba(48, 213, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  padding: 12px;
}

.c4-kpiLabel {
  font-size: 12px;
  color: var(--c4-dim);
}

.c4-kpiValue {
  margin-top: 6px;
  font-weight: 750;
  letter-spacing: 0.2px;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.c4-section {
  padding: 86px 0;
}

.c4-sectionTitle {
  font-size: 40px;
  letter-spacing: -0.4px;
  margin: 0;
}

.c4-sectionSub {
  margin: 12px 0 0;
  color: var(--c4-muted);
  line-height: 1.7;
  max-width: 72ch;
}

.c4-sectionHead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 34px;
}

.c4-grid3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.c4-grid2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.c4-card {
  border-radius: var(--c4-radius);
  border: 1px solid rgba(48, 213, 255, 0.14);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.03));
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.24);
  padding: 22px;
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease;
}

.c4-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--c4-glow);
  border-color: rgba(48, 213, 255, 0.26);
}

.c4-cardTitle {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.1px;
}

.c4-cardDesc {
  margin: 10px 0 0;
  color: var(--c4-muted);
  line-height: 1.7;
  font-size: 14px;
}

.c4-iconDot {
  width: 10px;
  height: 10px;
  border-radius: 99px;
  background: radial-gradient(circle at 30% 30%, rgba(94, 231, 255, 0.95), rgba(48, 213, 255, 0.40));
  box-shadow: 0 0 0 4px rgba(48, 213, 255, 0.08), 0 18px 50px rgba(48, 213, 255, 0.18);
  display: inline-block;
  margin-right: 10px;
}

.c4-row {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 18px;
  align-items: start;
}

.c4-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: grid;
  gap: 10px;
}

.c4-list li {
  padding-left: 18px;
  position: relative;
  color: var(--c4-muted);
  line-height: 1.7;
}

.c4-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 99px;
  position: absolute;
  left: 0;
  top: 9px;
  background: rgba(48, 213, 255, 0.9);
  box-shadow: 0 0 0 4px rgba(48, 213, 255, 0.10);
}

.c4-newsTabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.c4-pillBtn {
  height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid rgba(48, 213, 255, 0.16);
  background: rgba(255, 255, 255, 0.03);
  color: var(--c4-muted);
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.c4-pillBtn:hover {
  transform: translateY(-1px);
  border-color: rgba(48, 213, 255, 0.26);
  color: var(--c4-text);
}

.c4-pillBtn.isActive {
  background: rgba(48, 213, 255, 0.10);
  border-color: rgba(48, 213, 255, 0.30);
  color: var(--c4-text);
}

.c4-footer {
  border-top: 1px solid rgba(48, 213, 255, 0.12);
  padding: 36px 0;
  color: var(--c4-dim);
  background: rgba(7, 10, 18, 0.35);
}

.c4-footer p {
  margin: 8px 0 0;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 520ms ease, transform 520ms ease;
}

[data-reveal].isVisible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes c4Spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1024px) {
  .c4-heroGrid {
    grid-template-columns: 1fr;
  }

  .c4-h1 {
    font-size: 52px;
  }
}

@media (max-width: 820px) {
  .c4-links {
    display: none;
  }

  .c4-menuToggle {
    display: inline-flex;
  }

  .c4-navRight {
    gap: 10px;
  }

  .c4-mobilePanel {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 66px;
    border-radius: 18px;
    border: 1px solid rgba(48, 213, 255, 0.18);
    background: rgba(7, 10, 18, 0.88);
    backdrop-filter: blur(16px);
    box-shadow: var(--c4-shadow);
    padding: 12px;
    display: none;
  }

  .c4-mobilePanel.isOpen {
    display: grid;
    gap: 10px;
  }

  .c4-mobilePanel .c4-link {
    justify-content: center;
  }

  .c4-grid3,
  .c4-grid2,
  .c4-row {
    grid-template-columns: 1fr;
  }

  .c4-section {
    padding: 64px 0;
  }

  .c4-sectionTitle {
    font-size: 32px;
  }
}

@media (max-width: 520px) {
  .c4-container {
    padding: 0 16px;
  }
}

@media (max-width: 480px) {
  .c4-nav {
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .c4-navRight {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
  }

  .c4-brandTag {
    display: none;
  }

  .c4-brandName {
    font-size: 15px;
  }

  .c4-mark {
    width: 30px;
    height: 30px;
  }

  .c4-btn {
    height: 36px;
    padding: 0 10px;
    font-size: 12px;
  }

  .c4-select {
    height: 36px;
    padding: 0 10px;
    font-size: 12px;
  }

  .c4-menuToggle {
    width: 36px;
    height: 36px;
  }
}

@media (max-width: 420px) {
  .c4-formRow {
    flex-direction: column;
    align-items: stretch;
  }

  .c4-formRow .c4-input {
    height: 50px;
  }

  .c4-captcha {
    width: 100%;
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .c4-heroVisual::before {
    animation: none;
  }

  [data-reveal] {
    transition: none;
    opacity: 1;
    transform: none;
  }

  .c4-btn,
  .c4-card,
  .c4-link,
  .c4-pillBtn {
    transition: none;
  }
}