/* ========================================
   云联智控 - 企业官网样式
   惠州市云联环境科技有限公司
   ======================================== */

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

:root {
  --primary: #0052D9;
  --primary-dark: #003DA5;
  --primary-light: #E8F0FE;
  --accent-green: #00A870;
  --accent-orange: #ED7B2F;
  --accent-teal: #0096C7;
  --text: #1a1a2e;
  --text-secondary: #555;
  --bg: #ffffff;
  --bg-gray: #f7f8fa;
  --border: #e8eaed;
  --shadow: 0 2px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.10);
  --radius: 12px;
  --radius-lg: 20px;
  --max-width: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ---- Typography ---- */
h1 { font-size: 3rem; font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: 2.2rem; font-weight: 700; }
h3 { font-size: 1.4rem; font-weight: 600; }

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  h3 { font-size: 1.2rem; }
}

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

/* ---- Header / Navbar ---- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}
.header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.3rem; font-weight: 700; color: var(--primary);
}
.logo-icon {
  height: 38px;
  width: auto;
  object-fit: contain;
}
.nav { display: flex; gap: 32px; }
.nav a {
  font-size: 0.95rem; font-weight: 500; color: var(--text-secondary);
  position: relative; padding: 4px 0;
  transition: color var(--transition);
}
.nav a::after {
  content: ''; position: absolute; bottom: -2px; left: 0;
  width: 0; height: 2px; background: var(--primary);
  transition: width var(--transition);
}
.nav a:hover, .nav a.active { color: var(--primary); }
.nav a:hover::after, .nav a.active::after { width: 100%; }
.contact-btn {
  background: var(--primary); color: #fff !important;
  padding: 8px 20px !important; border-radius: 24px;
  transition: background var(--transition);
}
.contact-btn::after { display: none !important; }
.contact-btn:hover { background: var(--primary-dark); }

/* Mobile nav */
.menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.menu-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

@media (max-width: 900px) {
  .nav {
    position: fixed; top: 70px; left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0;
    padding: 16px 24px; box-shadow: var(--shadow-lg);
    transform: translateY(-120%); opacity: 0;
    transition: var(--transition);
  }
  .nav.open { transform: translateY(0); opacity: 1; }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--border); }
  .nav .contact-btn { margin-top: 8px; text-align: center; }
  .menu-toggle { display: flex; }
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
  padding-top: 70px;
}
.hero-bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, #f0f5ff 0%, #e8f4f8 40%, #f5f0ff 100%);
  z-index: -2;
}
.hero-bg::before {
  content: '';
  position: absolute; top: -30%; right: -15%;
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(0,82,217,0.06) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-bg::after {
  content: '';
  position: absolute; bottom: -10%; left: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0,168,112,0.05) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-grid {
  position: absolute; inset: 0; z-index: -1; opacity: 0.4;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-content { max-width: 700px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0,82,217,0.08); color: var(--primary);
  padding: 6px 16px; border-radius: 20px;
  font-size: 0.85rem; font-weight: 600; margin-bottom: 24px;
}
.hero-badge .dot {
  width: 8px; height: 8px; background: var(--accent-green);
  border-radius: 50%; animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero h1 { line-height: 1.15; margin-bottom: 20px; }
.hero h1 span { color: var(--primary); }
.hero-desc {
  font-size: 1.15rem; color: var(--text-secondary);
  line-height: 1.8; margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 28px;
  font-size: 1rem; font-weight: 600; cursor: pointer;
  transition: var(--transition); border: none;
}
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 4px 16px rgba(0,82,217,0.3);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,82,217,0.4);
}
.btn-outline {
  background: #fff; color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
}
.hero-stats {
  display: flex; gap: 48px; margin-top: 56px;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 2.2rem; font-weight: 800; color: var(--primary);
  line-height: 1.2;
}
.stat-num .unit { font-size: 1rem; font-weight: 500; }
.stat-label {
  font-size: 0.9rem; color: var(--text-secondary); margin-top: 4px;
}

@media (max-width: 768px) {
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .stat-num { font-size: 1.6rem; }
  .hero-desc { font-size: 1rem; }
}

/* ---- Section ---- */
.section { padding: 100px 0; }
.section-gray { background: var(--bg-gray); }
.section-header {
  text-align: center; margin-bottom: 64px;
}
.section-label {
  display: inline-block;
  font-size: 0.85rem; font-weight: 600; color: var(--primary);
  text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.section-header h2 { margin-bottom: 16px; }
.section-header p { color: var(--text-secondary); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* ---- About ---- */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: center;
}
.about-image {
  position: relative;
  border-radius: var(--radius-lg); overflow: hidden;
}
.about-image .img-placeholder {
  width: 100%; aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--primary-light), #e0f0ff);
  border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
}
.about-image .img-placeholder svg { width: 120px; height: 120px; opacity: 0.3; }
.about-image .badge-float {
  position: absolute; bottom: 24px; right: 24px;
  background: #fff; padding: 16px 24px;
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  text-align: center;
}
.badge-float .years { font-size: 2rem; font-weight: 800; color: var(--primary); }
.badge-float .label { font-size: 0.85rem; color: var(--text-secondary); }
.about-text h2 { margin-bottom: 20px; }
.about-text p { color: var(--text-secondary); margin-bottom: 16px; }
.about-numbers {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin-top: 32px;
}
.num-card {
  text-align: center; padding: 24px 16px;
  background: var(--bg); border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.num-card .number { font-size: 1.8rem; font-weight: 800; color: var(--primary); }
.num-card .desc { font-size: 0.85rem; color: var(--text-secondary); margin-top: 4px; }

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-numbers { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .num-card { padding: 16px 8px; }
  .num-card .number { font-size: 1.4rem; }
}

/* ---- Services ---- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.service-card {
  position: relative;
  padding: 36px 28px;
  background: #fff; border-radius: var(--radius);
  box-shadow: var(--shadow); transition: var(--transition);
  border: 1px solid transparent;
  cursor: pointer;
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border);
}
.service-icon {
  width: 56px; height: 56px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; font-size: 1.6rem; color: #fff;
}
.icon-solar { background: linear-gradient(135deg, #ED7B2F, #f0a060); }
.icon-equip { background: linear-gradient(135deg, #0052D9, #5b8def); }
.icon-engineer { background: linear-gradient(135deg, #00A870, #4dc9a0); }
.icon-digital { background: linear-gradient(135deg, #7B2FED, #a870f0); }
.icon-ai { background: linear-gradient(135deg, #ED2F7B, #f060a0); }
.service-card h3 { margin-bottom: 10px; }
.service-card p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 16px; }
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 0.78rem; padding: 4px 12px;
  border-radius: 12px; font-weight: 500;
}
.tag-solar { background: #FFF3E8; color: #ED7B2F; }
.tag-equip { background: #E8F0FE; color: #0052D9; }
.tag-engineer { background: #E8FAF3; color: #00A870; }
.tag-digital { background: #F3E8FF; color: #7B2FED; }
.tag-ai { background: #FFE8F0; color: #ED2F7B; }

/* ---- Tech ---- */
.tech-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 48px; align-items: center;
}
.tech-cards { display: flex; flex-direction: column; gap: 20px; }
.tech-card {
  display: flex; gap: 16px; padding: 20px;
  background: #fff; border-radius: var(--radius);
  box-shadow: var(--shadow); transition: var(--transition);
}
.tech-card:hover { transform: translateX(6px); box-shadow: var(--shadow-lg); }
.tech-card .icon-box {
  flex-shrink: 0; width: 48px; height: 48px;
  border-radius: 12px; display: flex; align-items: center;
  justify-content: center; font-size: 1.4rem; color: #fff;
}
.tech-card h4 { font-size: 1.05rem; margin-bottom: 4px; }
.tech-card p { font-size: 0.9rem; color: var(--text-secondary); }
.tech-visual {
  position: relative;
  background: linear-gradient(135deg, var(--primary-light), #f0f5ff);
  border-radius: var(--radius-lg); padding: 48px;
  text-align: center;
}
.tech-visual h3 { margin-bottom: 12px; }
.tech-visual p { color: var(--text-secondary); font-size: 0.95rem; }
.tech-flow {
  display: flex; gap: 0; margin-top: 32px; justify-content: center;
}
.flow-step {
  flex: 1; max-width: 120px; text-align: center;
  position: relative;
}
.flow-step::after {
  content: '→'; position: absolute; right: -12px; top: 16px;
  font-size: 1.2rem; color: var(--primary); font-weight: 700;
}
.flow-step:last-child::after { display: none; }
.flow-step .dot {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem; margin-bottom: 8px;
}
.flow-step .label { font-size: 0.78rem; color: var(--text-secondary); }

@media (max-width: 768px) {
  .tech-grid { grid-template-columns: 1fr; }
  .tech-flow { flex-wrap: wrap; }
  .flow-step { max-width: 80px; }
  .flow-step::after { right: -8px; font-size: 1rem; }
}

/* ---- Projects ---- */
.project-filters {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 10px; margin-bottom: 40px;
}
.filter-btn {
  padding: 8px 20px; border-radius: 20px;
  border: 1px solid var(--border); background: #fff;
  font-size: 0.88rem; font-weight: 500; color: var(--text-secondary);
  cursor: pointer; transition: var(--transition);
}
.filter-btn:hover { border-color: var(--primary); color: var(--primary); }
.filter-btn.active {
  background: var(--primary); color: #fff;
  border-color: var(--primary);
}
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}
.project-card {
  background: #fff; border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  transition: var(--transition);
}
.project-card.hidden { display: none; }
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.project-card .project-photo {
  width: 100%; height: 220px;
  object-fit: cover;
  background: var(--bg-gray);
}
.project-card .info { padding: 24px; }
.project-card .info .category {
  font-size: 0.8rem; font-weight: 600; color: var(--primary);
  margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.05em;
}
.project-card .info h3 { margin-bottom: 6px; font-size: 1.15rem; }
.project-card .project-scale {
  font-size: 0.9rem; color: var(--accent-orange);
  font-weight: 600; margin-bottom: 10px;
}
.project-card .info .details {
  font-size: 0.85rem; color: var(--text-secondary);
  display: flex; flex-wrap: wrap; gap: 10px;
}
.project-card .info .details span {
  background: var(--bg-gray); padding: 3px 10px;
  border-radius: 6px; white-space: nowrap;
}

/* Partner strip */
.partner-strip {
  margin-top: 60px; padding-top: 48px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.partner-label {
  font-size: 0.85rem; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: 24px; display: block;
}
.partner-logos {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 24px;
}
.partner-item {
  padding: 14px 28px; background: var(--bg-gray);
  border-radius: 12px; font-size: 1rem; font-weight: 600;
  color: var(--text); border: 1px solid var(--border);
  transition: var(--transition);
  cursor: default;
}
.partner-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .projects-grid { grid-template-columns: 1fr; }
  .project-filters { gap: 6px; }
  .filter-btn { padding: 6px 14px; font-size: 0.8rem; }
  .partner-item { padding: 10px 20px; font-size: 0.9rem; }
}

/* ---- Contact ---- */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-item {
  display: flex; gap: 16px; align-items: flex-start;
}
.contact-item .c-icon {
  flex-shrink: 0; width: 48px; height: 48px;
  background: var(--primary-light); border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; color: var(--primary);
}
.contact-item h4 { font-size: 1rem; margin-bottom: 2px; }
.contact-item p { color: var(--text-secondary); font-size: 0.95rem; }
.contact-form {
  background: #fff; padding: 36px;
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 0.9rem; font-weight: 600;
  margin-bottom: 8px; color: var(--text);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 12px 16px;
  border: 1px solid var(--border); border-radius: 8px;
  font-size: 0.95rem; font-family: inherit;
  transition: var(--transition); outline: none;
  background: var(--bg-gray);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0,82,217,0.1);
  background: #fff;
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-submit {
  width: 100%; padding: 14px;
  background: var(--primary); color: #fff;
  border: none; border-radius: 8px;
  font-size: 1rem; font-weight: 600; cursor: pointer;
  transition: var(--transition);
}
.form-submit:hover { background: var(--primary-dark); }

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ---- Footer ---- */
.footer {
  background: #0a1628; color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; margin-bottom: 40px;
}
.footer-brand h3 { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.8; }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; }
.footer-col a {
  display: block; font-size: 0.9rem;
  padding: 6px 0; transition: color var(--transition);
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  text-align: center; padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* ---- Back to top ---- */
.back-top {
  position: fixed; bottom: 32px; right: 32px;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: #fff;
  border: none; cursor: pointer; font-size: 1.2rem;
  box-shadow: var(--shadow-lg); opacity: 0; pointer-events: none;
  transition: var(--transition); z-index: 999;
}
.back-top.visible { opacity: 1; pointer-events: auto; }
.back-top:hover { transform: translateY(-4px); }

/* ---- Toast ---- */
.toast {
  position: fixed; top: 24px; left: 50%; transform: translateX(-50%);
  background: var(--accent-green); color: #fff;
  padding: 12px 28px; border-radius: 24px;
  font-weight: 600; font-size: 0.95rem;
  box-shadow: var(--shadow-lg); z-index: 9999;
  opacity: 0; transition: opacity 0.4s;
}
.toast.show { opacity: 1; }

/* ---- Print / utilities ---- */
.text-primary { color: var(--primary); }
.mt-16 { margin-top: 16px; }
.mt-32 { margin-top: 32px; }