/* ============================================
   TECHCORP - 软件开发公司官网设计系统
   ============================================ */

/* ---- CSS 变量 / 设计令牌 ---- */
:root {
  /* 背景色 */
  --bg-base: #060818;
  --bg-surface: #0d1228;
  --bg-elevated: #131a3a;
  --bg-card: rgba(20, 30, 65, 0.55);

  /* 品牌色 */
  --accent-cyan: #00e0ff;
  --accent-blue: #2563eb;
  --accent-purple: #8b5cf6;
  --accent-green: #00ffa3;
  --accent-pink: #f43f5e;

  /* 文字 */
  --text-primary: #f0f4ff;
  --text-secondary: #94a3c4;
  --text-muted: #5a6588;

  /* 边框 / 玻璃态 */
  --border-glow: rgba(0, 224, 255, 0.25);
  --border-subtle: rgba(148, 163, 196, 0.12);
  --glass-blur: blur(16px);

  /* 渐变 */
  --grad-primary: linear-gradient(135deg, #00e0ff 0%, #8b5cf6 100%);
  --grad-deep: linear-gradient(180deg, #0d1228 0%, #060818 100%);
  --grad-card: linear-gradient(145deg, rgba(20,30,65,0.6), rgba(13,18,40,0.4));

  /* 阴影 */
  --shadow-glow: 0 0 40px rgba(0, 224, 255, 0.15);
  --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.4);
  --shadow-float: 0 8px 30px rgba(0, 224, 255, 0.1);

  /* 间距 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* 布局 */
  --nav-height: 70px;
  --max-width: 1240px;

  /* 过渡 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---- 重置 ---- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---- 全局背景 ---- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(0, 224, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 224, 255, 0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 600px 400px at 15% 20%, rgba(0, 224, 255, 0.08), transparent),
    radial-gradient(ellipse 500px 500px at 85% 60%, rgba(139, 92, 246, 0.08), transparent),
    radial-gradient(ellipse 400px 300px at 50% 100%, rgba(37, 99, 235, 0.06), transparent);
}

/* ---- 粒子 Canvas ---- */
#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

/* ---- 容器 ---- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ---- 导航栏 ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: all 0.4s var(--ease-out);
}

.navbar.scrolled {
  background: rgba(6, 8, 24, 0.85);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(0, 224, 255, 0.4);
  position: relative;
  overflow: hidden;
}

.logo-icon svg { width: 22px; height: 22px; }

.logo-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all 0.3s var(--ease-out);
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(0, 224, 255, 0.08);
}

.nav-link.active {
  color: var(--accent-cyan);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.nav-cta {
  padding: 9px 22px;
  background: var(--grad-primary);
  color: #060818;
  font-weight: 700;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
  transition: all 0.3s var(--ease-out);
  margin-left: 12px;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 224, 255, 0.35);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s var(--ease-out);
}

.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: all 0.3s var(--ease-out);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--grad-primary);
  color: #060818;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 35px rgba(0, 224, 255, 0.35);
}

.btn-outline {
  border: 1.5px solid var(--border-glow);
  color: var(--accent-cyan);
  background: rgba(0, 224, 255, 0.04);
}

.btn-outline:hover {
  background: rgba(0, 224, 255, 0.12);
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
}

/* ---- 通用区块 ---- */
section { position: relative; z-index: 1; }

.section-pad {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 5px 16px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(0, 224, 255, 0.08);
  border: 1px solid var(--border-glow);
  border-radius: 20px;
  margin-bottom: 18px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-title .gradient-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* ---- 卡片 ---- */
.card {
  background: var(--grad-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  backdrop-filter: blur(8px);
  transition: all 0.4s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0;
  transition: opacity 0.4s;
}

.card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.card:hover::before { opacity: 1; }

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(0, 224, 255, 0.1);
  border: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--accent-cyan);
  transition: all 0.4s var(--ease-out);
}

.card:hover .card-icon {
  background: var(--grad-primary);
  color: #060818;
  transform: scale(1.1) rotate(-5deg);
  box-shadow: 0 0 25px rgba(0, 224, 255, 0.4);
}

.card-icon svg { width: 28px; height: 28px; }

.card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ---- 页面 Hero 通用 ---- */
.page-hero {
  padding: calc(var(--nav-height) + 80px) 0 60px;
  text-align: center;
  position: relative;
}

.page-hero .section-tag { margin-bottom: 20px; }

.page-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 18px;
}

.page-hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* ---- 页脚 ---- */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  transition: color 0.3s;
}

.footer-col a:hover { color: var(--accent-cyan); }

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---- 滚动动画 ---- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ---- 响应式 ---- */
@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(6, 8, 24, 0.97);
    backdrop-filter: var(--glass-blur);
    padding: 20px;
    gap: 4px;
    transform: translateY(-150%);
    transition: transform 0.4s var(--ease-out);
    border-bottom: 1px solid var(--border-subtle);
  }

  .nav-links.open { transform: translateY(0); }
  .nav-links .nav-link { width: 100%; text-align: center; padding: 14px; }
  .nav-cta { margin-left: 0; margin-top: 8px; width: 100%; justify-content: center; }
  .nav-toggle { display: flex; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section-pad { padding: 70px 0; }
}

@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  .card { padding: 26px; }
}