/* ==========================================================================
   Tubular Knitted Net — 站点主样式
   设计语言：深绿 #17884D 主色 · 现代落地页 · 卡片式网格
   ========================================================================== */

:root {
  --green: #17884D;
  --green-dark: #0E5A33;
  --green-deep: #0B4527;
  --green-soft: #E7F3EC;
  --green-tint: #F0F7F2;
  --lime: #7ED321;
  --amber: #F5A623;
  --bg: #F7F9F6;
  --white: #FFFFFF;
  --ink: #1F2A24;
  --ink-soft: #55635C;
  --ink-faint: #84908A;
  --line: #E4EAE6;
  --shadow-sm: 0 1px 3px rgba(11, 69, 39, 0.06);
  --shadow-md: 0 6px 20px rgba(11, 69, 39, 0.08);
  --shadow-lg: 0 16px 40px rgba(11, 69, 39, 0.12);
  --radius: 8px;
  --radius-sm: 6px;
  --container: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green-dark); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--green); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

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

/* 通用按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 8px; font-weight: 600; font-size: 15px;
  cursor: pointer; border: 1px solid transparent; line-height: 1.2;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--green); color: #fff; box-shadow: 0 6px 16px rgba(23, 136, 77, .28); }
.btn-primary:hover { background: var(--green-dark); color: #fff; }
.btn-outline { background: transparent; color: var(--green-dark); border-color: var(--green); }
.btn-outline:hover { background: var(--green-soft); color: var(--green-dark); }
.btn-ghost-light { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }
.btn-ghost-light:hover { background: rgba(255,255,255,.14); color: #fff; }
.btn-lg { padding: 15px 30px; font-size: 16px; }

/* 区块标题 */
.section { padding: 72px 0; }
.section--alt { background: var(--white); }
.section-head { max-width: 640px; margin: 0 auto 44px; text-align: center; }
.section-head.left { text-align: left; margin-left: 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--green); margin-bottom: 12px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--lime); border-radius: 2px; }
.section-head h2 { font-size: 32px; font-weight: 800; letter-spacing: -.02em; line-height: 1.2; color: var(--ink); }
.section-head p { margin-top: 12px; color: var(--ink-soft); font-size: 16px; }

/* ==========================================================================
   顶部导航
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92); backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 18px; color: var(--green-deep); }
.brand-mark {
  width: 36px; height: 36px; border-radius: 8px; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-deep) 100%);
  display: flex; align-items: center; justify-content: center; color: #fff;
}
.brand-mark svg { width: 20px; height: 20px; }
.brand .brand-sub { display: block; font-size: 11px; font-weight: 600; color: var(--ink-faint); letter-spacing: .04em; margin-top: -2px; }

.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 15px; font-weight: 600; color: var(--ink-soft); position: relative; padding: 6px 0; }
.nav-links a:hover, .nav-links a.active { color: var(--green-dark); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px;
  background: var(--green); border-radius: 2px;
}
.header-cta { display: flex; align-items: center; gap: 12px; }
.header-cta .btn { padding: 10px 20px; font-size: 14px; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 40px; height: 40px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(120% 120% at 85% 0%, #EAF5EE 0%, var(--green-tint) 45%, #FFFFFF 100%);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; padding: 72px 0 64px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--green-soft); color: var(--green-dark);
  font-size: 13px; font-weight: 700; padding: 7px 14px; border-radius: 8px; margin-bottom: 20px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--lime); }
.hero h1 { font-size: 46px; font-weight: 800; letter-spacing: -.03em; line-height: 1.1; color: var(--green-deep); }
.hero h1 .accent { color: var(--green); }
.hero-sub { margin-top: 20px; font-size: 18px; color: var(--ink-soft); max-width: 520px; }
.hero-actions { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero-stats { margin-top: 40px; display: flex; gap: 36px; flex-wrap: wrap; }
.hero-stat .num { font-size: 30px; font-weight: 800; color: var(--green-dark); letter-spacing: -.02em; }
.hero-stat .num span { color: var(--lime); }
.hero-stat .lbl { font-size: 13px; color: var(--ink-faint); margin-top: 2px; }

.hero-visual { position: relative; }
.hero-visual .hero-img {
  border-radius: 10px; overflow: hidden; box-shadow: var(--shadow-lg);
  background: var(--white); aspect-ratio: 5/4; object-fit: cover;
}
.hero-visual .float-chip {
  position: absolute; background: var(--white); border-radius: 8px; box-shadow: var(--shadow-md);
  padding: 12px 16px; display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 600;
}
.float-chip .ic { width: 34px; height: 34px; border-radius: 6px; background: var(--green-soft); display: flex; align-items: center; justify-content: center; color: var(--green); }
.float-chip.top { top: -18px; right: 16px; }
.float-chip.bottom { bottom: -18px; left: 16px; }

/* ==========================================================================
   产品网格
   ========================================================================== */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.product-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .2s ease, box-shadow .2s ease;
}
.product-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.product-card .thumb { position: relative; aspect-ratio: 4/3; background: var(--green-tint); overflow: hidden; }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.product-card:hover .thumb img { transform: scale(1.05); }
.product-card .tag {
  position: absolute; top: 12px; left: 12px; background: var(--green); color: #fff;
  font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 8px;
}
.product-card .body { padding: 20px 20px 22px; display: flex; flex-direction: column; flex: 1; }
.product-card .cat { font-size: 12px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--ink-faint); }
.product-card h3 { margin-top: 6px; font-size: 18px; font-weight: 700; color: var(--ink); line-height: 1.3; }
.product-card .desc { margin-top: 8px; font-size: 14px; color: var(--ink-soft); flex: 1; }
.product-card .foot { margin-top: 16px; display: flex; align-items: center; justify-content: space-between; }
.product-card .more { font-size: 14px; font-weight: 700; color: var(--green); display: inline-flex; align-items: center; gap: 5px; }
.product-card .more svg { transition: transform .18s ease; }
.product-card:hover .more svg { transform: translateX(3px); }

/* ==========================================================================
   优势区
   ========================================================================== */
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.feature {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px; transition: box-shadow .2s ease, transform .2s ease;
}
.feature:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.feature .ic {
  width: 48px; height: 48px; border-radius: 8px; background: var(--green-soft);
  display: flex; align-items: center; justify-content: center; color: var(--green); margin-bottom: 16px;
}
.feature .ic svg { width: 24px; height: 24px; }
.feature h3 { font-size: 16px; font-weight: 700; color: var(--ink); }
.feature p { margin-top: 8px; font-size: 14px; color: var(--ink-soft); }

/* ==========================================================================
   应用场景
   ========================================================================== */
.apps { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.app-chip {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--white); border: 1px solid var(--line); border-radius: 8px;
  padding: 10px 20px; font-size: 15px; font-weight: 600; color: var(--ink);
  transition: all .18s ease;
}
.app-chip:hover { border-color: var(--green); color: var(--green-dark); background: var(--green-tint); }
.app-chip .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--lime); }

/* ==========================================================================
   流程
   ========================================================================== */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.step { position: relative; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; }
.step .idx {
  width: 40px; height: 40px; border-radius: 50%; background: var(--green);
  color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.step h3 { font-size: 16px; font-weight: 700; }
.step p { margin-top: 8px; font-size: 14px; color: var(--ink-soft); }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 12px; overflow: hidden; }
.faq-q {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  padding: 18px 20px; font-size: 16px; font-weight: 700; color: var(--ink);
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
}
.faq-q .plus { font-size: 22px; color: var(--green); font-weight: 400; transition: transform .2s ease; flex: 0 0 auto; }
.faq-item.open .faq-q .plus { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .25s ease; }
.faq-a .inner { padding: 0 20px 18px; font-size: 15px; color: var(--ink-soft); }

/* ==========================================================================
   联系 CTA / 表单
   ========================================================================== */
.cta {
  background: linear-gradient(135deg, var(--green-deep) 0%, var(--green) 60%, #1FA05B 100%);
  border-radius: 10px; overflow: hidden; position: relative; color: #fff;
}
.cta-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; padding: 52px; }
.cta h2 { font-size: 30px; font-weight: 800; letter-spacing: -.02em; color: #fff; }
.cta p { margin-top: 12px; color: rgba(255,255,255,.85); }
.cta-contact { margin-top: 24px; display: flex; flex-direction: column; gap: 14px; }
.cta-contact a { display: flex; align-items: center; gap: 12px; color: #fff; font-size: 16px; font-weight: 600; }
.cta-contact a .ic {
  width: 38px; height: 38px; border-radius: 8px; background: rgba(255,255,255,.16);
  display: flex; align-items: center; justify-content: center; flex: 0 0 auto;
}
.cta-contact a .ic svg { width: 19px; height: 19px; }
.cta-contact a:hover { color: var(--lime); }

.form-card { background: var(--white); border-radius: 10px; padding: 28px; box-shadow: var(--shadow-lg); }
.form-card .field { margin-bottom: 16px; }
.form-card label { display: block; font-size: 13px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.form-card input, .form-card textarea, .form-card select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  font-size: 15px; font-family: inherit; color: var(--ink); background: var(--bg);
  transition: border .15s ease, box-shadow .15s ease;
}
.form-card input:focus, .form-card textarea:focus, .form-card select:focus {
  outline: none; border-color: var(--green); box-shadow: 0 0 0 3px rgba(23,136,77,.12);
}
.form-card textarea { resize: vertical; min-height: 96px; }
.form-card .btn { width: 100%; justify-content: center; }
.form-note { margin-top: 12px; font-size: 12px; color: var(--ink-faint); text-align: center; }
.form-result { display: none; margin-top: 12px; font-size: 14px; font-weight: 600; padding: 10px 14px; border-radius: 8px; }
.form-result.ok { display: block; background: var(--green-soft); color: var(--green-dark); }
.form-result.err { display: block; background: #FDECEC; color: #B33434; }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer { background: var(--green-deep); color: rgba(255,255,255,.75); padding: 56px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 36px; }
.footer-brand .brand { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 14px; color: rgba(255,255,255,.65); max-width: 300px; }
.site-footer h4 { color: #fff; font-size: 14px; font-weight: 700; letter-spacing: .04em; margin-bottom: 16px; text-transform: uppercase; }
.site-footer ul li { margin-bottom: 10px; }
.site-footer ul a { color: rgba(255,255,255,.7); font-size: 14px; }
.site-footer ul a:hover { color: var(--lime); }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: rgba(255,255,255,.7); margin-bottom: 12px; }
.footer-contact svg { width: 18px; height: 18px; flex: 0 0 auto; color: var(--lime); margin-top: 2px; }
.footer-bottom { margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; color: rgba(255,255,255,.5); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ==========================================================================
   内页：产品详情
   ========================================================================== */
.page-hero { background: radial-gradient(120% 140% at 80% 0%, #EAF5EE 0%, var(--green-tint) 55%, #FFFFFF 100%); padding: 48px 0 40px; }
.breadcrumb { font-size: 14px; color: var(--ink-faint); margin-bottom: 14px; }
.breadcrumb a { color: var(--ink-faint); }
.breadcrumb a:hover { color: var(--green); }
.breadcrumb .sep { margin: 0 8px; }
.page-hero h1 { font-size: 34px; font-weight: 800; letter-spacing: -.02em; color: var(--green-deep); }
.page-hero .sub { margin-top: 10px; font-size: 16px; color: var(--ink-soft); }

.product-detail { padding: 44px 0 72px; }
.pd-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; }
.pd-gallery .main-img { border-radius: var(--radius); overflow: hidden; background: var(--white); border: 1px solid var(--line); aspect-ratio: 4/3; }
.pd-gallery .main-img img { width: 100%; height: 100%; object-fit: contain; }
.pd-thumbs { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.pd-thumbs button {
  width: 72px; height: 72px; border-radius: 6px; overflow: hidden; border: 2px solid var(--line);
  background: var(--white); cursor: pointer; padding: 0; transition: border .15s ease;
}
.pd-thumbs button.active { border-color: var(--green); }
.pd-thumbs button img { width: 100%; height: 100%; object-fit: cover; }

.pd-info h2 { font-size: 24px; font-weight: 800; color: var(--ink); }
.pd-info .tagline { margin-top: 6px; font-size: 16px; color: var(--green); font-weight: 600; }
.pd-info .summary { margin-top: 16px; font-size: 15px; color: var(--ink-soft); }
.pd-actions { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 12px; }

.spec-table { margin-top: 28px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--white); }
.spec-table .row { display: grid; grid-template-columns: 200px 1fr; border-bottom: 1px solid var(--line); }
.spec-table .row:last-child { border-bottom: 0; }
.spec-table .k { padding: 13px 18px; background: var(--green-tint); font-weight: 700; font-size: 14px; color: var(--green-deep); }
.spec-table .v { padding: 13px 18px; font-size: 14px; color: var(--ink); }

.pd-section { margin-top: 40px; }
.pd-section h3 { font-size: 20px; font-weight: 800; color: var(--ink); margin-bottom: 18px; padding-bottom: 10px; border-bottom: 2px solid var(--green-soft); }
.chk-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; }
.chk-list li { display: flex; gap: 10px; font-size: 15px; color: var(--ink-soft); align-items: flex-start; }
.chk-list li svg { width: 20px; height: 20px; color: var(--green); flex: 0 0 auto; margin-top: 2px; }

.related { margin-top: 56px; }
.related .product-grid { margin-top: 26px; }

/* ==========================================================================
   内页：联系页 / 产品列表页
   ========================================================================== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: start; }
.contact-info-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.contact-info-card h3 { font-size: 18px; font-weight: 800; margin-bottom: 18px; }
.contact-row { display: flex; gap: 14px; margin-bottom: 20px; }
.contact-row .ic { width: 44px; height: 44px; border-radius: 8px; background: var(--green-soft); color: var(--green); display: flex; align-items: center; justify-content: center; flex: 0 0 auto; }
.contact-row .ic svg { width: 22px; height: 22px; }
.contact-row .lbl { font-size: 13px; color: var(--ink-faint); font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.contact-row .val { font-size: 15px; color: var(--ink); font-weight: 600; }
.contact-row .val a { color: var(--ink); }
.contact-row .val a:hover { color: var(--green); }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; padding: 48px 0; }
  .hero h1 { font-size: 38px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid, .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .cta-inner { grid-template-columns: 1fr; padding: 40px; }
  .pd-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .section { padding: 48px 0; }
  .section-head h2 { font-size: 26px; }
  .hero h1 { font-size: 30px; }
  .hero-sub { font-size: 16px; }
  .hero-stats { gap: 22px; }
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    background: var(--white); flex-direction: column; align-items: stretch; gap: 0;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md);
    display: none; padding: 10px 24px 18px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-links a:last-child { border-bottom: 0; }
  .nav-toggle { display: flex; align-items: center; justify-content: center; }
  .header-cta .btn { display: none; }
  .product-grid { grid-template-columns: 1fr; }
  .features-grid, .steps-grid { grid-template-columns: 1fr; }
  .chk-list { grid-template-columns: 1fr; }
  .cta-inner { padding: 28px 20px; }
  .cta h2 { font-size: 24px; }
  .spec-table .row { grid-template-columns: 1fr; }
  .spec-table .k { border-bottom: 1px solid var(--line); }
  .footer-grid { grid-template-columns: 1fr; }
}