/* ============================================================
   CoreHub AI 宣传页 · 赛博朋克蓝主题（纯色填充，无渐变）
   ============================================================ */
:root {
  --bg: #04070d;
  --bg-2: #0a1120;
  --panel: #0c1526;
  --line: rgba(59, 130, 246, .25);
  --line-dim: rgba(59, 130, 246, .12);
  --blue: #3b82f6;
  --blue-hot: #60a5fa;
  --cyan: #22d3ee;
  --text: #c7d3e8;
  --text-dim: #6b7a95;
  --glow: 0 0 18px rgba(59, 130, 246, .35);
  --clip-corner: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

/* 赛博网格底纹（1px 实线，非渐变着色） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, var(--line-dim) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, var(--line-dim) 0 1px, transparent 1px 64px);
  mask-image: none;
}

#net-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* 扫描线 */
.scanlines {
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(0, 0, 0, .14) 0 1px, transparent 1px 4px);
  opacity: .5;
}

main, .nav, .footer { position: relative; z-index: 2; }

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

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ---------------- 导航 ---------------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 5vw;
  background: rgba(4, 7, 13, .82);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav-brand { display: flex; align-items: center; gap: 10px; }

.nav-title {
  font-weight: 800;
  letter-spacing: 3px;
  font-size: 18px;
  color: #fff;
  font-family: Consolas, "Courier New", monospace;
}
.nav-title em, .footer-brand em { font-style: normal; color: var(--blue-hot); }

.nav-links { display: flex; gap: 34px; }
.nav-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 1px;
  position: relative;
  transition: color .25s;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--blue);
  box-shadow: var(--glow);
  transition: width .25s;
}
.nav-links a:hover { color: var(--blue-hot); }
.nav-links a:hover::after { width: 100%; }

.nav-right { display: flex; align-items: center; gap: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 1px solid var(--line);
  padding: 9px 8px;
  cursor: pointer;
}
.nav-toggle span {
  width: 20px; height: 2px;
  background: var(--blue-hot);
  transition: transform .3s, opacity .3s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-block;
  font-family: Consolas, "Courier New", monospace;
  font-weight: 700;
  letter-spacing: 2px;
  cursor: pointer;
  clip-path: var(--clip-corner);
  transition: transform .2s, box-shadow .2s, background .2s, color .2s;
  border: none;
}
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-lg { padding: 15px 36px; font-size: 16px; }

.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 0 22px rgba(59, 130, 246, .45);
}
.btn-primary:hover {
  background: var(--blue-hot);
  transform: translateY(-2px);
  box-shadow: 0 0 34px rgba(96, 165, 250, .65);
}

.btn-ghost {
  background: transparent;
  color: var(--blue-hot);
  outline: 1px solid var(--blue);
  outline-offset: -1px;
}
.btn-ghost:hover {
  background: rgba(59, 130, 246, .12);
  transform: translateY(-2px);
}

/* ---------------- Hero ---------------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 5vw 80px;
  position: relative;
}

/* 四角取景框 */
.hero-frame {
  position: absolute;
  inset: 90px 5vw 40px;
  pointer-events: none;
  background:
    linear-gradient(var(--blue), var(--blue)) top left / 34px 2px,
    linear-gradient(var(--blue), var(--blue)) top left / 2px 34px,
    linear-gradient(var(--blue), var(--blue)) top right / 34px 2px,
    linear-gradient(var(--blue), var(--blue)) top right / 2px 34px,
    linear-gradient(var(--blue), var(--blue)) bottom left / 34px 2px,
    linear-gradient(var(--blue), var(--blue)) bottom left / 2px 34px,
    linear-gradient(var(--blue), var(--blue)) bottom right / 34px 2px,
    linear-gradient(var(--blue), var(--blue)) bottom right / 2px 34px;
  background-repeat: no-repeat;
  opacity: .6;
}

.hero-kicker {
  font-family: Consolas, monospace;
  font-size: 13px;
  letter-spacing: 6px;
  color: var(--cyan);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
}
.dot-live {
  width: 8px; height: 8px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--cyan);
  animation: blink 1.4s infinite;
}
@keyframes blink { 50% { opacity: .25; } }

.hero h1 {
  font-size: clamp(48px, 10vw, 110px);
  font-weight: 900;
  letter-spacing: 8px;
  color: #fff;
  line-height: 1.1;
}

/* 故障 Glitch 效果 */
.glitch { position: relative; }
.glitch::before, .glitch::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.glitch::before {
  color: var(--cyan);
  animation: glitch-a 3.2s infinite steps(1);
}
.glitch::after {
  color: var(--blue);
  animation: glitch-b 2.6s infinite steps(1);
}
@keyframes glitch-a {
  0%, 88%, 100% { clip-path: inset(100% 0 0 0); transform: none; }
  89% { clip-path: inset(8% 0 82% 0); transform: translate(-4px, 2px); }
  92% { clip-path: inset(45% 0 40% 0); transform: translate(4px, -1px); }
  95% { clip-path: inset(78% 0 6% 0); transform: translate(-3px, 1px); }
}
@keyframes glitch-b {
  0%, 84%, 100% { clip-path: inset(100% 0 0 0); transform: none; }
  85% { clip-path: inset(60% 0 22% 0); transform: translate(5px, 1px); }
  90% { clip-path: inset(20% 0 60% 0); transform: translate(-5px, -2px); }
  96% { clip-path: inset(85% 0 3% 0); transform: translate(3px, 2px); }
}

.hero-typeline {
  font-family: Consolas, "Courier New", monospace;
  font-size: clamp(15px, 2.4vw, 21px);
  color: var(--blue-hot);
  margin: 26px 0 14px;
  min-height: 1.8em;
}
.caret { animation: blink 1s infinite; color: var(--cyan); }

.hero-desc { color: var(--text-dim); font-size: 15px; max-width: 640px; }

.hero-actions { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; margin-top: 38px; }

.hero-stats {
  display: flex;
  gap: clamp(24px, 6vw, 72px);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 64px;
  border-top: 1px solid var(--line);
  padding-top: 34px;
}
.hero-stats > div { text-align: center; }
.stat-num {
  font-family: Consolas, monospace;
  font-size: clamp(30px, 4.5vw, 46px);
  font-weight: 800;
  color: var(--blue-hot);
  text-shadow: 0 0 20px rgba(59, 130, 246, .55);
}
.hero-stats dd { color: var(--text-dim); font-size: 13px; letter-spacing: 1px; }

/* ---------------- 通用 Section ---------------- */
.section { padding: 96px 2vw; max-width: 1540px; margin: 0 auto; }

.section-title {
  font-size: clamp(26px, 4vw, 38px);
  color: #fff;
  letter-spacing: 4px;
  font-weight: 900;
}
.section-title span {
  color: var(--blue);
  font-family: Consolas, monospace;
  margin-right: 12px;
}
.section-title::after {
  content: "";
  display: block;
  width: 76px; height: 3px;
  background: var(--blue);
  box-shadow: var(--glow);
  margin-top: 14px;
}
.section-sub { color: var(--text-dim); margin: 14px 0 48px; letter-spacing: 1px; }

.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

/* ---------------- 能力卡片 ---------------- */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--clip-corner);
  padding: 30px 26px 26px;
  position: relative;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--blue-hot);
  box-shadow: 0 0 26px rgba(59, 130, 246, .28), inset 0 0 26px rgba(59, 130, 246, .06);
}
.card:hover::before { transform: scaleX(1); }

.card-icon {
  font-size: 30px;
  color: var(--blue-hot);
  text-shadow: 0 0 16px rgba(96, 165, 250, .7);
  margin-bottom: 14px;
  font-family: Consolas, monospace;
}
.card h3 { color: #fff; font-size: 19px; letter-spacing: 2px; margin-bottom: 10px; }
.card p { color: var(--text-dim); font-size: 14px; min-height: 4.2em; }

.card-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.card-tags li {
  font-family: Consolas, monospace;
  font-size: 11px;
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, .35);
  padding: 2px 10px;
  letter-spacing: 1px;
}

/* 人话收益行：给非技术读者的一句话 */
.card-benefit {
  min-height: 0 !important;
  margin-top: 12px;
  padding: 8px 12px;
  border-left: 2px solid var(--cyan);
  background: rgba(34, 211, 238, .05);
  color: var(--cyan) !important;
  font-size: 13px !important;
  letter-spacing: .5px;
}

/* 使用场景故事卡 */
.scene h3 { display: flex; align-items: baseline; gap: 12px; }
.scene-time {
  font-family: Consolas, monospace;
  font-size: 13px;
  color: var(--blue-hot);
  border: 1px solid rgba(96, 165, 250, .45);
  padding: 2px 8px;
  letter-spacing: 1px;
  white-space: nowrap;
  text-shadow: 0 0 10px rgba(96, 165, 250, .55);
}
.scene p { min-height: 3.4em; }

/* 读者标注：告诉采购/普通用户这两节可以给技术人员看 */
.audience-tag {
  display: inline-block;
  font-family: Consolas, monospace;
  font-size: 11px;
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, .35);
  padding: 1px 8px;
  margin-right: 10px;
  letter-spacing: 1px;
  vertical-align: 2px;
}

/* ---------------- 宣传大图展示 ---------------- */
/* 通栏出血展示：突破 1280 内容区，占满视口宽度 */
.showcase {
  position: relative;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-bottom: 120px;
}
.showcase-inner {
  position: relative;
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 2vw;
}

.shot {
  background: var(--panel);
  border: 1px solid var(--line);
  position: relative;
}

/* 显示器外框 */
.shot-desktop {
  padding: 12px;
  clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
  box-shadow: 0 0 44px rgba(59, 130, 246, .18);
}
/* 底座 */
.shot-desktop::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -26px;
  width: 180px; height: 26px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-top: none;
  clip-path: polygon(12% 0, 88% 0, 100% 100%, 0 100%);
}

/* 手机截图自带机身外观，此处仅做定位叠放 */
.shot-mobile {
  position: absolute;
  right: 4vw;
  bottom: -70px;
  width: clamp(220px, 24vw, 330px);
  background: none;
  border: none;
  z-index: 2;
  transition: transform .35s;
}
.shot-mobile:hover { transform: translateY(-8px); }

/* 第二组：手机图叠在左下角，形成交错节奏 */
.showcase-alt .shot-mobile {
  right: auto;
  left: 4vw;
}

/* 截图可点击放大 */
.showcase .shot img { cursor: zoom-in; }

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

/* 窗口标题栏 */
.shot-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-bottom: none;
  padding: 9px 14px;
  font-family: Consolas, "Courier New", monospace;
}
.bar-dots { display: inline-flex; gap: 6px; }
.bar-dots i {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 8px rgba(59, 130, 246, .7);
}
.bar-dots i:first-child { background: var(--cyan); box-shadow: 0 0 8px rgba(34, 211, 238, .7); }
.bar-title {
  flex: 1;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--blue-hot);
  text-shadow: 0 0 12px rgba(96, 165, 250, .55);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.bar-signal { color: var(--cyan); font-size: 12px; letter-spacing: 1px; }

/* ---------------- 多端平台 ---------------- */
.platform {
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: var(--clip-corner);
  padding: 34px 22px;
  text-align: center;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.platform:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: var(--cyan);
  box-shadow: 0 0 26px rgba(34, 211, 238, .25);
}
.platform b {
  display: block;
  font-family: Consolas, monospace;
  font-size: 22px;
  letter-spacing: 3px;
  color: var(--blue-hot);
  text-shadow: 0 0 18px rgba(96, 165, 250, .6);
  margin-bottom: 12px;
}
.platform p { color: var(--text-dim); font-size: 14px; }

/* ---------------- Harness 架构分层 ---------------- */
.harness { display: grid; gap: 14px; }
.h-layer {
  display: flex;
  align-items: center;
  gap: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--clip-corner);
  padding: 22px 30px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.h-layer:hover {
  transform: translateX(8px);
  border-color: var(--cyan);
  box-shadow: -6px 0 0 var(--blue), 0 0 24px rgba(59, 130, 246, .22);
}
.h-layer b {
  flex: 0 0 108px;
  font-family: Consolas, monospace;
  font-size: 17px;
  letter-spacing: 4px;
  color: var(--blue-hot);
  text-shadow: 0 0 16px rgba(96, 165, 250, .6);
  border-right: 1px solid var(--line);
  padding-right: 22px;
  text-align: center;
}
.h-layer p { color: var(--text-dim); font-size: 14.5px; margin: 0; }
.h-note {
  margin-top: 26px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--cyan);
  border-left: 3px solid var(--blue);
  padding-left: 14px;
}

/* ---------------- CTA ---------------- */
.cta {
  text-align: center;
  padding: 110px 5vw 120px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
}
.cta h2 {
  font-size: clamp(30px, 6vw, 58px);
  font-weight: 900;
  letter-spacing: 6px;
  color: #fff;
}
.cta p { color: var(--text-dim); margin: 16px 0 36px; letter-spacing: 2px; }

/* 联系方式卡片 */
.cta-cards {
  display: flex;
  gap: 26px;
  justify-content: center;
  align-items: stretch;
  flex-wrap: wrap;
  margin-top: 8px;
}
.contact-card {
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--clip-corner);
  padding: 28px 36px 24px;
  min-width: 260px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.contact-card:hover {
  transform: translateY(-5px);
  border-color: var(--blue-hot);
  box-shadow: 0 0 26px rgba(59, 130, 246, .3);
}
.contact-card h4 {
  font-family: Consolas, monospace;
  font-size: 14px;
  letter-spacing: 2px;
  color: var(--cyan);
  margin-bottom: 18px;
}
.contact-card p { font-size: 12px; margin: 16px 0 0 !important; letter-spacing: 1px; }

.contact-line {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 14px;
  margin: 14px 0;
}
.cl-label {
  font-family: Consolas, monospace;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--text-dim);
  white-space: nowrap;
}

.contact-mail {
  display: inline-block;
  font-family: Consolas, "Courier New", monospace;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--blue-hot);
  text-shadow: 0 0 16px rgba(96, 165, 250, .6);
  border-bottom: 2px solid var(--blue);
  padding-bottom: 4px;
  transition: color .2s, text-shadow .2s;
}
.contact-mail:hover {
  color: #fff;
  text-shadow: 0 0 22px rgba(96, 165, 250, .95);
}

.contact-qr {
  display: block;
  margin: 0 auto;
  width: 168px;
  height: 168px;
  object-fit: contain;
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 6px;
  box-shadow: 0 0 22px rgba(59, 130, 246, .35);
}

/* ---------------- 页脚 ---------------- */
.footer {
  padding: 40px 5vw;
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-weight: 800;
  letter-spacing: 3px;
  color: #fff;
  font-family: Consolas, monospace;
}
.footer a { color: var(--blue-hot); }
.footer a:hover { text-shadow: 0 0 12px rgba(96, 165, 250, .8); }
.footer-icp { margin-top: 8px; display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; letter-spacing: 1px; }

/* ---------------- Lightbox 放大 ---------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(4, 7, 13, .94);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3vh 2vw;
  cursor: zoom-out;
}
.lightbox[hidden] { display: none; }
.lightbox img {
  max-width: 96vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  border: 1px solid var(--line);
  box-shadow: 0 0 60px rgba(59, 130, 246, .35);
  cursor: default;
}
.lightbox img.lb-float { border: none; box-shadow: none; }
.lb-close {
  position: absolute;
  top: 18px; right: 26px;
  z-index: 51;
  width: 44px; height: 44px;
  font-size: 26px;
  line-height: 1;
  color: var(--blue-hot);
  background: var(--panel);
  border: 1px solid var(--blue);
  clip-path: var(--clip-corner);
  cursor: pointer;
  transition: background .2s, color .2s;
}
.lb-close:hover { background: var(--blue); color: #fff; }
body.lb-open { overflow: hidden; }

/* ---------------- 滚动出场动画 ---------------- */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .glitch::before, .glitch::after { animation: none; clip-path: inset(100% 0 0 0); }
  #net-canvas { display: none; }
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 980px) {
  .nav-links { gap: 22px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .card p { min-height: 0; }
  .scene p { min-height: 0; }
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 62px; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-2);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease;
  }
  .nav-links.open { max-height: 380px; }
  .nav-links a { padding: 16px 8vw; border-top: 1px solid var(--line-dim); }
  .nav-right .btn { display: none; }

  .hero-frame { inset: 90px 4vw 24px; }
  .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }

  /* 手机图改为叠在大图右下角、比例缩小 */
  .shot-mobile {
    right: 4%;
    bottom: -28px;
    width: 130px;
  }
  .showcase { margin-bottom: 70px; }
  .hero-stats { gap: 22px; }
  .section { padding: 72px 4vw; }

  .h-layer { flex-direction: column; align-items: flex-start; gap: 10px; padding: 20px 22px; }
  .h-layer b {
    flex: none;
    width: 100%;
    text-align: left;
    border-right: none;
    border-bottom: 1px solid var(--line);
    padding: 0 0 8px;
  }
}