/* ============================================================
   Wellpower Electric - Main Stylesheet
   Company: Jinan Wellpower Electric Co., Ltd
   Domain : www.wellpq.com
   ============================================================ */

/* ── Root Variables ───────────────────────────────────────── */
:root {
  --primary:   #0d2137;
  --secondary: #1565C0;
  --accent:    #00ACC1;
  --energy:    #FF8F00;
  --bg-light:  #F5F7FA;
  --text-dark: #1A202C;
  --text-gray: #4A5568;
  --white:     #FFFFFF;
  --shadow-sm: 0 1px 4px rgba(0,0,0,.10);
  --shadow-md: 0 4px 16px rgba(0,0,0,.14);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.18);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition: all .3s ease;
  --max-width: 1200px;
}

/* ── Reset ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.65;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a  { text-decoration: none; color: inherit; }
ul { list-style: none; }
address { font-style: normal; }

/* ── Typography helpers ───────────────────────────────────── */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; }
.section-label {
  display: inline-block;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .6rem;
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  color: var(--primary);
  margin-bottom: .9rem;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-gray);
  max-width: 640px;
  margin: 0 auto 3rem;
}
.text-center { text-align: center; }

/* ── Layout ───────────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
section { padding: 88px 0; }
.bg-light    { background: var(--bg-light); }
.bg-dark     { background: var(--primary); color: var(--white); }
.bg-gradient { background: linear-gradient(135deg, var(--primary) 0%, #1a3a5c 50%, var(--secondary) 100%); color: var(--white); }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: .95rem; font-weight: 700;
  cursor: pointer; border: none;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary  { background: var(--secondary); color: var(--white); }
.btn-primary:hover  { background: #0d47a1; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-accent   { background: var(--energy);   color: var(--white); }
.btn-accent:hover   { background: #e65100;   transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline  { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,.7); }
.btn-outline:hover  { background: var(--white); color: var(--primary); }
.btn-outline-dark { background: transparent; color: var(--secondary); border: 2px solid var(--secondary); }
.btn-outline-dark:hover { background: var(--secondary); color: var(--white); }
.btn-white    { background: var(--white); color: var(--secondary); }
.btn-white:hover    { background: var(--bg-light); transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* ── Header / Nav ─────────────────────────────────────────── */
#header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,33,55,.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  transition: var(--transition);
}
#header.scrolled { background: var(--primary); box-shadow: var(--shadow-md); }
nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 70px;
  max-width: var(--max-width); margin: 0 auto;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; flex-shrink: 0;
}
.logo-name    { display: block; font-size: 1.05rem; font-weight: 700; color: var(--white); }
.logo-tagline { display: block; font-size: .65rem; color: var(--accent); letter-spacing: .08em; text-transform: uppercase; margin-top: 1px; }
.nav-links {
  display: flex; align-items: center; gap: 2rem;
}
.nav-links a {
  color: rgba(255,255,255,.82); font-size: .9rem; font-weight: 500;
  position: relative; padding-bottom: 4px; transition: var(--transition);
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 0; height: 2px; background: var(--accent); transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-cta {
  background: var(--accent) !important; color: var(--white) !important;
  padding: 9px 22px; border-radius: var(--radius-md); font-weight: 700 !important;
}
.nav-cta:hover { background: #00838f !important; }
.nav-cta::after { display: none !important; }
.menu-toggle {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 6px;
}
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--white); transition: var(--transition); border-radius: 2px; }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(135deg, var(--primary) 0%, #132d4a 55%, #1565C0 100%);
  position: relative; overflow: hidden; padding-top: 70px;
}
.hero-bg-pattern {
  position: absolute; inset: 0; opacity: .04;
  background-image: radial-gradient(circle, #ffffff 1px, transparent 1px);
  background-size: 40px 40px;
}
.hero-wave {
  position: absolute; bottom: -1px; left: 0; right: 0; z-index: 1;
}
.hero-content {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0,172,193,.18); border: 1px solid rgba(0,172,193,.4);
  color: var(--accent); padding: 6px 16px; border-radius: 100px;
  font-size: .8rem; font-weight: 700; margin-bottom: 1.4rem; letter-spacing: .04em;
}
.hero-text h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.6rem); color: var(--white);
  margin-bottom: 1.4rem; line-height: 1.15;
}
.hero-text h1 em { color: var(--accent); font-style: normal; }
.hero-text p {
  font-size: 1.1rem; color: rgba(255,255,255,.78); margin-bottom: 2.4rem; line-height: 1.8;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-visual { display: flex; justify-content: center; align-items: center; }
.energy-diagram { width: 100%; max-width: 500px; filter: drop-shadow(0 20px 40px rgba(0,0,0,.4)); }

/* ── Stats Bar ────────────────────────────────────────────── */
.stats-bar { background: var(--secondary); padding: 44px 0; }
.stats-grid {
  display: grid; grid-template-columns: repeat(4,1fr); gap: 1.5rem; text-align: center;
}
.stat-number {
  display: block; font-size: 2.6rem; font-weight: 800;
  color: var(--white); line-height: 1;
}
.stat-label { display: block; font-size: .875rem; color: rgba(255,255,255,.75); margin-top: .35rem; }

/* ── Service Cards ────────────────────────────────────────── */
.services-grid {
  display: grid; grid-template-columns: repeat(3,1fr); gap: 1.75rem;
}
.service-card {
  background: var(--white); border-radius: var(--radius-lg);
  padding: 2rem; border: 1px solid #E2E8F0;
  box-shadow: var(--shadow-sm); transition: var(--transition);
  position: relative; overflow: hidden;
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  transform: scaleX(0); transform-origin: left; transition: var(--transition);
}
.service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, rgba(21,101,192,.1), rgba(0,172,193,.1));
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.4rem; font-size: 1.9rem;
}
.service-card h3 { font-size: 1.2rem; color: var(--primary); margin-bottom: .65rem; }
.service-card p  { color: var(--text-gray); font-size: .92rem; line-height: 1.7; margin-bottom: 1.4rem; }
.service-link {
  color: var(--secondary); font-weight: 700; font-size: .88rem;
  display: inline-flex; align-items: center; gap: 6px; transition: var(--transition);
}
.service-link:hover { gap: 12px; color: var(--accent); }

/* ── Features (Why Us) ────────────────────────────────────── */
.features-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 1.5rem; }
.feature-item {
  display: flex; gap: 1.25rem; padding: 1.5rem;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1);
  transition: var(--transition);
}
.feature-item:hover { background: rgba(255,255,255,.1); }
.feature-icon {
  width: 50px; height: 50px; flex-shrink: 0;
  background: rgba(0,172,193,.18); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
}
.feature-text h4 { font-size: 1.05rem; color: var(--white); margin-bottom: .4rem; }
.feature-text p  { color: rgba(255,255,255,.65); font-size: .9rem; line-height: 1.65; }

/* ── CTA Section ──────────────────────────────────────────── */
.cta-section {
  background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
  text-align: center; padding: 88px 0;
}
.cta-section h2 { font-size: clamp(1.8rem,3vw,2.6rem); color: var(--white); margin-bottom: .9rem; }
.cta-section p  { font-size: 1.1rem; color: rgba(255,255,255,.88); margin-bottom: 2.5rem; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ── Footer ───────────────────────────────────────────────── */
footer { background: #060f1a; color: rgba(255,255,255,.65); padding: 64px 0 28px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem;
}
.footer-brand p { font-size: .88rem; line-height: 1.8; margin: 1rem 0 1.4rem; }
.footer-contact-item {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: .875rem; margin-bottom: .7rem;
}
.footer-contact-item a:hover { color: var(--accent); }
.footer-links h4 { color: var(--white); font-size: .95rem; margin-bottom: 1.1rem; }
.footer-links li { margin-bottom: .5rem; }
.footer-links a { color: rgba(255,255,255,.55); font-size: .85rem; transition: var(--transition); }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-divider { border: none; border-top: 1px solid rgba(255,255,255,.08); margin-bottom: 1.4rem; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  font-size: .82rem; color: rgba(255,255,255,.35);
}
.footer-certs { display: flex; gap: .75rem; }
.cert-badge {
  padding: 3px 10px; border: 1px solid rgba(255,255,255,.18);
  border-radius: 100px; font-size: .72rem; color: rgba(255,255,255,.45);
}

/* ── Page Hero (inner pages) ──────────────────────────────── */
.page-hero {
  background: linear-gradient(135deg, var(--primary), #1a3a5c);
  padding: 148px 0 80px; text-align: center; position: relative; overflow: hidden;
}
.page-hero-bg {
  position: absolute; inset: 0; opacity: .04;
  background-image: radial-gradient(circle, #ffffff 1px, transparent 1px);
  background-size: 40px 40px;
}
.page-hero h1  { font-size: clamp(2rem,4vw,3rem); color: var(--white); position: relative; }
.page-hero > p { font-size: 1.1rem; color: rgba(255,255,255,.72); margin-top: .9rem; position: relative; }
.breadcrumb {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  margin-bottom: 1.25rem; font-size: .82rem; position: relative;
}
.breadcrumb a { color: var(--accent); }
.breadcrumb .sep { color: rgba(255,255,255,.3); }
.breadcrumb .current { color: rgba(255,255,255,.6); }

/* ── About Page ───────────────────────────────────────────── */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.about-visual {
  background: linear-gradient(135deg, #1565C0, #00ACC1);
  border-radius: var(--radius-lg); height: 420px;
  display: flex; align-items: center; justify-content: center; font-size: 6rem;
  position: relative; overflow: hidden;
}
.about-visual::after {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23fff' fill-opacity='0.08'%3E%3Cpath d='M0 40L40 0H20L0 20M40 40V20L20 40'/%3E%3C/g%3E%3C/svg%3E");
}
.about-text .section-label { margin-bottom: 0; }
.about-text h2 { font-size: clamp(1.8rem,3vw,2.4rem); color: var(--primary); margin: .5rem 0 1.2rem; }
.about-text p  { color: var(--text-gray); line-height: 1.85; margin-bottom: 1rem; }
.mission-cards { display: grid; grid-template-columns: repeat(2,1fr); gap: 1.25rem; }
.mission-card {
  background: var(--white); border-radius: var(--radius-md);
  padding: 1.4rem; border-left: 4px solid var(--accent); box-shadow: var(--shadow-sm);
}
.mission-card h4 { color: var(--primary); margin-bottom: .5rem; font-size: .95rem; }
.mission-card p  { color: var(--text-gray); font-size: .875rem; line-height: 1.65; }
.value-cards { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; margin-top: 3rem; }
.value-card {
  text-align: center; padding: 2rem 1.5rem;
  background: var(--white); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm); border: 1px solid #E2E8F0; transition: var(--transition);
}
.value-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.value-icon { font-size: 2.4rem; margin-bottom: 1rem; display: block; }
.value-card h4 { color: var(--primary); margin-bottom: .5rem; }
.value-card p  { color: var(--text-gray); font-size: .88rem; line-height: 1.65; }

/* ── Products Page ────────────────────────────────────────── */
.product-section {
  padding: 80px 0; border-bottom: 1px solid #E8EDF2;
}
.product-section:last-of-type { border-bottom: none; }
.product-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.product-layout.reverse .product-visual { order: -1; }
.product-visual {
  background: linear-gradient(135deg, rgba(21,101,192,.08), rgba(0,172,193,.08));
  border: 1px solid rgba(21,101,192,.15);
  border-radius: var(--radius-lg); height: 360px;
  display: flex; align-items: center; justify-content: center; font-size: 5.5rem;
  position: relative; overflow: hidden;
}
.product-tag {
  display: inline-block; background: rgba(0,172,193,.12);
  color: var(--accent); padding: 4px 12px; border-radius: 100px;
  font-size: .75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .05em; margin-bottom: .8rem;
}
.product-content h2 { font-size: 1.75rem; color: var(--primary); margin-bottom: 1rem; }
.product-content > p { color: var(--text-gray); line-height: 1.8; margin-bottom: 1.4rem; }
.feature-list { margin-bottom: 1.5rem; }
.feature-list li {
  display: flex; align-items: flex-start; gap: 10px;
  margin-bottom: .55rem; color: var(--text-gray); font-size: .92rem;
}
.feature-list li::before { content: '✓'; color: var(--accent); font-weight: 900; flex-shrink: 0; margin-top: .05rem; }
.app-tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.app-tag {
  background: var(--bg-light); color: var(--secondary);
  padding: 4px 12px; border-radius: 100px; font-size: .78rem; font-weight: 600;
}

/* ── Contact Page ─────────────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 2.5rem; }
.contact-info-panel {
  background: var(--primary); border-radius: var(--radius-lg);
  padding: 2.5rem; color: var(--white);
}
.contact-info-panel h3 { font-size: 1.4rem; margin-bottom: .3rem; }
.contact-info-panel .sub { color: rgba(255,255,255,.55); font-size: .875rem; margin-bottom: 2rem; }
.contact-detail { display: flex; gap: 1rem; margin-bottom: 1.4rem; }
.contact-detail-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: rgba(0,172,193,.2); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; font-size: 1.15rem;
}
.contact-detail-text h5 { font-size: .78rem; color: rgba(255,255,255,.5); margin-bottom: 4px; font-weight: 500; }
.contact-detail-text p, .contact-detail-text a { color: var(--white); font-size: .92rem; line-height: 1.5; }
.contact-detail-text a:hover { color: var(--accent); }
.contact-form-panel {
  background: var(--white); border-radius: var(--radius-lg);
  padding: 2.5rem; box-shadow: var(--shadow-md); border: 1px solid #E2E8F0;
}
.contact-form-panel h3 { font-size: 1.4rem; color: var(--primary); margin-bottom: .3rem; }
.contact-form-panel .sub { color: var(--text-gray); font-size: .875rem; margin-bottom: 1.8rem; }
.form-group { margin-bottom: 1.15rem; }
.form-group label { display: block; font-size: .82rem; font-weight: 700; color: var(--text-dark); margin-bottom: 6px; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 11px 15px;
  border: 1.5px solid #E2E8F0; border-radius: var(--radius-md);
  font-size: .92rem; font-family: inherit; color: var(--text-dark);
  transition: var(--transition); background: var(--white);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { outline: none; border-color: var(--secondary); box-shadow: 0 0 0 3px rgba(21,101,192,.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group textarea { resize: vertical; min-height: 110px; }
.form-note { font-size: .78rem; color: var(--text-gray); margin-top: 1rem; text-align: center; }
.map-placeholder {
  background: linear-gradient(135deg, rgba(21,101,192,.08), rgba(0,172,193,.08));
  border: 1px solid #E2E8F0; border-radius: var(--radius-lg);
  height: 280px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: .75rem;
  color: var(--text-gray); margin-top: 1.5rem;
}
.map-placeholder span { font-size: 2.5rem; }

/* ── Scroll-top Button ────────────────────────────────────── */
#scrollTop {
  position: fixed; bottom: 28px; right: 28px;
  width: 46px; height: 46px; z-index: 999;
  background: var(--secondary); color: var(--white);
  border: none; border-radius: 50%; cursor: pointer;
  font-size: 1.1rem; font-weight: 700;
  box-shadow: var(--shadow-md);
  opacity: 0; transform: translateY(16px); transition: var(--transition);
}
#scrollTop.visible { opacity: 1; transform: translateY(0); }
#scrollTop:hover { background: var(--primary); }

/* ── Animate-on-scroll ────────────────────────────────────── */
.animate-on-scroll { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.animate-on-scroll.animated { opacity: 1; transform: none; }

/* ── Form success state ───────────────────────────────────── */
.form-success {
  display: none; background: rgba(0,172,193,.1); border: 1px solid var(--accent);
  border-radius: var(--radius-md); padding: 1rem; text-align: center;
  color: var(--primary); font-weight: 600; margin-top: 1rem;
}
.form-success.visible { display: block; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2,1fr); }
  .footer-grid   { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 900px) {
  .hero-content   { grid-template-columns: 1fr; text-align: center; }
  .hero-visual    { display: none; }
  .hero-actions   { justify-content: center; }
  .about-intro    { grid-template-columns: 1fr; }
  .product-layout { grid-template-columns: 1fr; }
  .product-layout.reverse .product-visual { order: 0; }
  .contact-grid   { grid-template-columns: 1fr; }
  .value-cards    { grid-template-columns: repeat(2,1fr); }
  .stats-grid     { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; gap: .8rem; padding: 1rem 24px 1.5rem; position: absolute; top: 70px; left: 0; right: 0; background: var(--primary); box-shadow: var(--shadow-lg); }
  .nav-links.open { display: flex; }
  .menu-toggle { display: flex; }
  .services-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .mission-cards { grid-template-columns: 1fr; }
  .footer-grid   { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: .75rem; text-align: center; }
  .form-row      { grid-template-columns: 1fr; }
  section        { padding: 64px 0; }
}
@media (max-width: 480px) {
  .value-cards { grid-template-columns: 1fr; }
  .cta-actions { flex-direction: column; align-items: center; }
}