/* ===========---===
   珠海天利打印耗材 — 科技蓝 + 阿里橙
   ===========---=== */

/* --- CSS Variables --- */
:root {
  --color-dark:    #0D1117;
  --color-metal:   #161B22;
  --color-steel:   #21262D;
  --color-accent:  #1677FF;
  --color-accent2: #FF6A00;
  --color-orange:  #FF6A00;
  --color-white:    #ffffff;
  --color-light:    #F5F7FA;
  --color-gray:     #8B949E;
  --color-border:   #E5E7EB;
  --font-body: 'Segoe UI', 'Microsoft YaHei', sans-serif;
  --font-heading: 'Segoe UI', 'Microsoft YaHei', sans-serif;
  --max-width: 1200px;
  --header-h: 64px;
  --section-pad: 80px 0;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-body); color: var(--color-dark); background: var(--color-white); line-height: 1.7; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
h1,h2,h3,h4 { font-family: var(--font-heading); font-weight: 700; line-height: 1.3; }

/* --- Utility --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.section { padding: var(--section-pad); }
.section-dark { background: var(--color-dark); color: var(--color-white); }
.section-steel { background: var(--color-metal); color: var(--color-white); }
.section-light { background: var(--color-light); }
.btn {
  display: inline-block; padding: 12px 32px; border-radius: 4px;
  font-weight: 600; font-size: 0.95rem; cursor: pointer;
  border: 2px solid transparent; transition: all 0.25s;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: #0958D9; }
.btn-outline {
  background: transparent; color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-outline:hover { background: var(--color-accent); color: #fff; }
.btn-white { background: #fff; color: var(--color-dark); }
.btn-white:hover { background: #eee; }
.section-tag {
  display: inline-block; font-size: 0.8rem; letter-spacing: 2px;
  text-transform: uppercase; color: var(--color-accent); font-weight: 600;
  margin-bottom: 8px;
}
.section-title { font-size: 2rem; margin-bottom: 16px; }
.section-desc { color: var(--color-gray); max-width: 640px; margin-bottom: 40px; }
.text-center { text-align: center; }
.text-white { color: #fff; }
.text-accent { color: var(--color-accent); }

/* ============================================
   Header — 新版
   ============================================ */
.header {
  position: fixed; top: 0; left: 0; width: 100%; height: var(--header-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 1000; display: flex; align-items: center;
  transition: background 0.3s, box-shadow 0.3s, border-color 0.3s;
}
.header.scrolled {
  background: rgba(255,255,255,0.98);
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 8px rgba(0,0,0,0.06);
}
.header .container {
  display: flex; align-items: center; justify-content: space-between;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.logo-icon svg { width: 34px; height: 34px; border-radius: 8px; flex-shrink: 0; }
.logo-text { display: flex; align-items: center; gap: 4px; line-height: 1.2; }
.logo-cn { font-size: 1.25rem; font-weight: 800; color: var(--color-dark); letter-spacing: 1px; }

/* Desktop Nav */
.nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  display: flex; align-items: center; gap: 5px;
  font-size: 0.88rem; font-weight: 500; color: var(--color-dark);
  padding: 8px 14px; border-radius: 8px;
  transition: all 0.2s; position: relative; text-decoration: none;
  white-space: nowrap;
}
.nav-link:hover { background: rgba(22,119,255,0.06); color: var(--color-accent); }
.nav-link.active { color: var(--color-accent); background: rgba(22,119,255,0.08); }
.nav-icon { width: 16px; height: 16px; flex-shrink: 0; opacity: 0.7; }
.nav-link:hover .nav-icon, .nav-link.active .nav-icon { opacity: 1; }
.nav-link.active::after { display: none; }

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-trigger {
  background: none; border: none; cursor: pointer; font-family: inherit;
  display: flex; align-items: center; gap: 5px;
  font-size: 0.88rem; font-weight: 500; color: var(--color-dark);
  padding: 8px 14px; border-radius: 8px; transition: all 0.2s;
}
.nav-dropdown-trigger:hover { background: rgba(22,119,255,0.06); color: var(--color-accent); }
.dropdown-arrow { transition: transform 0.2s; }
.nav-dropdown:hover .dropdown-arrow { transform: rotate(180deg); }
.nav-dropdown-menu {
  position: absolute; top: calc(100% + 8px); left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 220px; background: #fff; border: 1px solid var(--color-border);
  border-radius: 12px; box-shadow: 0 12px 40px rgba(0,0,0,0.12);
  padding: 8px; opacity: 0; visibility: hidden; transition: all 0.2s;
  z-index: 10;
}
.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0);
}
.nav-dropdown-menu a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; font-size: 0.88rem; color: var(--color-dark);
  border-radius: 8px; transition: all 0.15s; text-decoration: none;
}
.nav-dropdown-menu a:hover { background: rgba(22,119,255,0.06); color: var(--color-accent); }
.dropdown-icon { font-size: 1.1rem; width: 24px; text-align: center; flex-shrink: 0; }
.nav-dropdown-menu a::after { display: none; }

/* Header CTA */
.btn-header {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 22px; border-radius: 8px;
  font-weight: 600; font-size: 0.85rem;
  background: var(--color-accent); color: #fff; text-decoration: none;
  transition: all 0.2s; white-space: nowrap; margin-left: 8px;
}
.btn-header:hover { background: #0958D9; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(22,119,255,0.3); }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 8px; border-radius: 8px; transition: background 0.2s;
}
.hamburger:hover { background: rgba(0,0,0,0.05); }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--color-dark); border-radius: 2px; transition: 0.3s; }

/* Mobile Nav Overlay */
.mobile-nav-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
  background: rgba(0,0,0,0.45); backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1999; opacity: 0; visibility: hidden; transition: 0.3s;
}
.mobile-nav-overlay.open { opacity: 1; visibility: visible; }

/* Mobile Nav */
.mobile-nav {
  position: fixed; top: 0; right: -100%; width: 320px; max-width: 90vw; height: 100vh;
  background: #fff; z-index: 2000; padding: 0; transition: right 0.35s cubic-bezier(0.4,0,0.2,1);
  overflow-y: auto; display: flex; flex-direction: column;
  box-shadow: -8px 0 32px rgba(0,0,0,0.12);
}
.mobile-nav.open { right: 0; }
.mobile-nav-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; border-bottom: 1px solid var(--color-border);
}
.mobile-close {
  background: none; border: none; font-size: 1.8rem; cursor: pointer;
  color: var(--color-dark); padding: 4px 8px; border-radius: 8px; line-height: 1;
}
.mobile-close:hover { background: rgba(0,0,0,0.05); }
.mobile-nav-links { flex: 1; padding: 16px 0; }
.mobile-nav-links > a {
  display: block; padding: 14px 24px; font-size: 1rem;
  color: var(--color-dark); font-weight: 500; text-decoration: none;
  transition: all 0.15s; border-left: 3px solid transparent;
}
.mobile-nav-links > a:hover { background: rgba(22,119,255,0.04); color: var(--color-accent); }
.mobile-nav-section { padding: 8px 0; }
.mobile-nav-label {
  display: block; padding: 10px 24px 6px; font-size: 0.75rem;
  font-weight: 700; color: var(--color-gray); letter-spacing: 1px;
  text-transform: uppercase;
}
.mobile-nav-section a {
  display: block; padding: 10px 24px 10px 40px; font-size: 0.95rem;
  font-weight: 400; color: #555; text-decoration: none;
  border-left: 3px solid transparent; transition: all 0.15s;
}
.mobile-nav-section a:hover { color: var(--color-accent); border-left-color: var(--color-accent); }
.mobile-nav-cta { padding: 20px 24px; border-top: 1px solid var(--color-border); }
.mobile-nav-cta .btn { display: block; text-align: center; }

@media (max-width: 768px) {
  .nav { display: none; }
  .btn-header { display: none; }
  .hamburger { display: flex; }
}

/* --- Hero --- */
.hero {
  margin-top: var(--header-h); min-height: 560px;
  background: linear-gradient(135deg, var(--color-dark) 0%, #001F3F 60%, var(--color-accent) 100%);
  display: flex; align-items: center; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -10%; width: 600px; height: 600px;
  border-radius: 50%; border: 1px solid rgba(255,255,255,0.05);
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -5%; width: 400px; height: 400px;
  border-radius: 50%; border: 1px solid rgba(255,255,255,0.05);
}
.hero .container { position: relative; z-index: 2; padding: 80px 20px; }
.hero-tag {
  display: inline-block; font-size: 0.75rem; letter-spacing: 3px;
  text-transform: uppercase; color: var(--color-accent2); font-weight: 600;
  border: 1px solid var(--color-accent2); padding: 4px 14px; border-radius: 20px;
  margin-bottom: 20px;
}
.hero h1 { font-size: 3rem; color: #fff; margin-bottom: 16px; }
.hero h1 span { color: var(--color-accent); }
.hero p { font-size: 1.1rem; color: #8B949E; max-width: 520px; margin-bottom: 32px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }

/* --- Product Cards (Home) --- */
.product-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.product-card {
  background: #fff; border: 1px solid var(--color-border); border-radius: 12px;
  padding: 32px; transition: all 0.3s; position: relative; overflow: hidden;
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 4px; height: 0;
  background: var(--color-accent); transition: height 0.3s;
}
.product-card:hover { border-color: var(--color-accent); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(22,119,255,0.12); }
.product-card:hover::before { height: 100%; }
.product-card-icon {
  width: 56px; height: 56px; border-radius: 12px; background: var(--color-light);
  display: flex; align-items: center; justify-content: center; font-size: 1.5rem;
  margin-bottom: 20px; color: var(--color-accent);
}
.product-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.product-card p { font-size: 0.9rem; color: var(--color-gray); margin-bottom: 20px; }
.product-card a { font-size: 0.85rem; font-weight: 600; color: var(--color-accent); }
.product-card a:hover { text-decoration: underline; }

/* --- Features Grid --- */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.feature-item {
  text-align: center; padding: 32px 20px; border-radius: 12px;
  border: 1px solid var(--color-border); transition: all 0.3s;
}
.feature-item:hover { border-color: var(--color-accent); box-shadow: 0 8px 32px rgba(22,119,255,0.08); }
.feature-icon {
  width: 64px; height: 64px; margin: 0 auto 16px; border-radius: 50%;
  background: var(--color-light); display: flex; align-items: center;
  justify-content: center; font-size: 1.5rem; color: var(--color-accent);
}
.feature-item h4 { font-size: 1rem; margin-bottom: 8px; }

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--color-accent) 0%, #0958D9 100%);
  color: #fff; text-align: center; padding: 80px 20px;
}
.cta-section h2 { font-size: 2rem; margin-bottom: 16px; }
.cta-section p { font-size: 1.05rem; opacity: 0.85; margin-bottom: 32px; max-width: 560px; margin-left: auto; margin-right: auto; }

/* --- Page Hero (sub pages) --- */
.page-hero {
  margin-top: var(--header-h); padding: 100px 0 60px;
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-accent) 100%);
  color: #fff; text-align: center;
}
.page-hero h1 { font-size: 2.5rem; margin-bottom: 12px; }
.page-hero p { color: #8B949E; font-size: 1rem; }

/* --- About Page --- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-grid .content h2 { font-size: 1.8rem; margin-bottom: 16px; }
.about-grid .content p { color: var(--color-gray); margin-bottom: 16px; }
.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 32px; }
.stat-item { text-align: center; }
.stat-item .num { font-size: 2.2rem; font-weight: 800; color: var(--color-accent); }
.stat-item .label { font-size: 0.85rem; color: var(--color-gray); }

/* --- Product Category Page --- */
.product-category-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.product-category-card {
  border: 1px solid var(--color-border); border-radius: 12px; overflow: hidden;
  transition: all 0.3s;
}
.product-category-card:hover { box-shadow: 0 12px 40px rgba(0,0,0,0.1); transform: translateY(-4px); }
.product-category-card .img-placeholder {
  height: 200px; background: var(--color-light); display: flex;
  align-items: center; justify-content: center; font-size: 3rem; color: var(--color-accent);
}
.product-category-card .body { padding: 24px; }
.product-category-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.product-category-card p { font-size: 0.9rem; color: var(--color-gray); margin-bottom: 16px; }

/* --- Contact Page --- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.contact-form input, .contact-form textarea {
  padding: 14px 16px; border: 1px solid var(--color-border); border-radius: 8px;
  font-size: 0.95rem; font-family: inherit; transition: border-color 0.2s;
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--color-accent); }
.contact-form textarea { min-height: 140px; resize: vertical; }
.contact-info-card {
  background: var(--color-dark); color: #fff; padding: 32px; border-radius: 12px;
}
.contact-info-card h3 { font-size: 1.2rem; margin-bottom: 24px; color: var(--color-accent2); }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 20px; }
.contact-info-item .icon {
  width: 40px; height: 40px; border-radius: 8px; background: rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  color: var(--color-accent); font-size: 1.1rem;
}
.contact-info-item .text strong { display: block; margin-bottom: 2px; }
.contact-info-item .text span { font-size: 0.9rem; color: #8B949E; }

/* --- Footer --- */
.footer {
  background: var(--color-dark); color: #8B949E; padding: 60px 0 24px;
  border-top: 1px solid #21262D;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { color: #fff; font-size: 1.2rem; margin-bottom: 16px; display: block; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; }
.footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; }
.footer a { display: block; font-size: 0.9rem; color: #8B949E; padding: 4px 0; transition: color 0.2s; }
.footer a:hover { color: var(--color-accent); }
.footer-newsletter input {
  width: 100%; padding: 10px 14px; border-radius: 6px; border: 1px solid #21262D;
  background: #161B22; color: #fff; font-size: 0.9rem; margin-bottom: 8px;
}
.footer-newsletter input:focus { outline: none; border-color: var(--color-accent); }
.footer-newsletter button {
  padding: 10px 20px; background: var(--color-accent); color: #fff;
  border: none; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 0.9rem;
}
.footer-bottom {
  border-top: 1px solid #21262D; padding-top: 20px; display: flex;
  justify-content: space-between; align-items: center; font-size: 0.85rem;
}
.footer-social { display: flex; gap: 16px; }
.footer-social a { font-size: 1.1rem; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .page-hero h1 { font-size: 1.8rem; }
  .about-stats { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .hero-btns { flex-direction: column; }
  .about-stats { grid-template-columns: 1fr; }
  .section-title { font-size: 1.5rem; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}