/* ═══════════ 赛森环保 · 品牌样式表 ═══════════ */
/* 从主页提取的核心CSS，供全站子页面（文章、导航页等）共用 */
/* 上传到服务器 /css/style.css */

/* ── Google Fonts（需配合页面中 <link> 引入） ── */
/* fonts: Noto Sans SC, Noto Serif SC, Cormorant Garamond */

/* ═════ DESIGN TOKENS ═════ */
:root {
  --green-deep: #0a3d2e;
  --green: #166a4f;
  --green-light: #2d8a6a;
  --green-pale: #8fbfa8;
  --sage: #eaf3ee;
  --sage-dark: #d4e8dc;
  --white: #ffffff;
  --off-white: #f8faf9;
  --cream: #fdfbf7;
  --gold: #c8985a;
  --gold-light: #dab87a;
  --gold-dark: #a07838;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --text: #1f2937;
  --text-muted: #6b7280;
  --font-display: 'Noto Serif SC', 'STSong', 'Songti SC', serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-num: 'Cormorant Garamond', 'Noto Serif SC', 'Georgia', serif;
  --font-label: 'Noto Sans SC', 'PingFang SC', sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out-expo: cubic-bezier(0.19,1,0.22,1);
  --shadow-card: 0 2px 12px rgba(10,61,46,0.06);
  --shadow-lg: 0 8px 30px rgba(10,61,46,0.08);
  --shadow-xl: 0 20px 50px rgba(10,61,46,0.1);
  --radius: 8px;
  --radius-lg: 14px;
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; font-size:16px; }

/* ── Modular Type Scale ── */
:root {
  --ts-7: clamp(3.2rem, 5.5vw, 5rem);
  --ts-6: clamp(2.4rem, 4vw, 3.6rem);
  --ts-5: clamp(2rem, 3vw, 2.8rem);
  --ts-4: clamp(1.6rem, 2.2vw, 2.2rem);
  --ts-3: 1.15rem;
  --ts-2: 0.95rem;
  --ts-1: 0.82rem;
  --ts-0: 0.72rem;
  --leading-loose: 1.9;
  --leading-body: 1.78;
  --leading-tight: 1.16;
  --track-display: 0.02em;
  --track-heading: 0.03em;
  --track-label: 0.12em;
  --track-caption: 0.06em;
}

body {
  font-family:var(--font-body);
  color:var(--text);
  background:var(--white);
  line-height:var(--leading-body);
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  text-rendering:optimizeLegibility;
}
img { display:block; max-width:100%; height:auto; }
a { text-decoration:none; color:inherit; }
.container { max-width:1260px; margin:0 auto; padding:0 clamp(1.5rem,4vw,3rem); }

/* ── Typography ── */
h1 { font-family:var(--font-display); font-size:var(--ts-5); font-weight:700; color:var(--green-deep); letter-spacing:var(--track-heading); }
h2 { font-family:var(--font-display); font-size:var(--ts-4); font-weight:600; color:var(--green-deep); letter-spacing:var(--track-heading); }
h3 { font-family:var(--font-display); font-size:var(--ts-3); font-weight:600; color:var(--green-deep); }
p { font-size:var(--ts-2); line-height:var(--leading-body); margin-bottom:1rem; }

/* ═════ TOP BAR ═════ */
.top-bar {
  background: var(--green-deep);
  color: rgba(255,255,255,0.7);
  font-size:var(--ts-0); font-weight:400;
  padding:0.45rem 0; letter-spacing:0.03em;
  font-family:var(--font-label);
}
.top-bar .container { display:flex; justify-content:space-between; align-items:center; }
.top-bar a { color: rgba(255,255,255,0.8); transition:color 0.3s; }
.top-bar a:hover { color:var(--gold-light); }
.top-bar .top-links { display:flex; gap:1.8rem; align-items:center; }
.top-bar .top-city { display:flex; align-items:center; gap:0.3rem; }

/* ═════ NAVIGATION ═════ */
.navbar {
  position:sticky; top:0; z-index:1000;
  background:var(--white);
  box-shadow:0 1px 0 var(--gray-200);
  transition:box-shadow 0.3s;
}
.navbar.shadow { box-shadow:0 2px 12px rgba(0,0,0,0.07); }
.navbar .container {
  display:flex; align-items:center; justify-content:space-between;
  height:72px; padding: 0;
}
.nav-brand { display:flex; align-items:center; }
.nav-logo-img { height:52px !important; width:auto !important; min-height:52px; max-height:none; object-fit:contain; display:block; }
.nav-menu { display:flex; list-style:none; gap:0; align-items:center; }
.nav-menu > li { position:relative; }
.nav-menu > li > a {
  display:block; padding:1.55rem 1.15rem;
  font-size:var(--ts-1); font-weight:500; color:var(--text);
  transition:color 0.3s; letter-spacing:var(--track-caption);
  white-space:nowrap; font-family:var(--font-label);
}
.nav-menu > li > a:hover { color:var(--green); }
.nav-menu > li.active > a { color:var(--green); }
.nav-menu > li.active > a::after {
  content:''; position:absolute; bottom:16px; left:1.15rem; right:1.15rem;
  height:2.5px; background:var(--green); border-radius:2px;
}

/* Dropdown */
.nav-menu .dropdown {
  position:absolute; top:100%; left:0;
  background:var(--white); min-width:180px;
  box-shadow:var(--shadow-xl); border-radius:var(--radius);
  opacity:0; visibility:hidden; transform:translateY(8px);
  transition:all 0.3s var(--ease);
  list-style:none; padding:0.6rem 0; z-index:100;
}
.nav-menu li:hover > .dropdown { opacity:1; visibility:visible; transform:translateY(0); }
.dropdown li a {
  display:block; padding:0.65rem 1.4rem;
  font-size:var(--ts-1); color:var(--gray-700); font-weight:400;
  transition:all 0.25s; letter-spacing:0.03em;
  font-family:var(--font-label);
}
.dropdown li a:hover { color:var(--green); background:var(--sage); }

.nav-actions { display:flex; align-items:center; gap:1rem; }
.nav-tel {
  display:flex; align-items:center; gap:0.5rem;
  font-size:1.35rem; font-weight:700; color:var(--green-deep);
  font-family:'KaiTi','STKaiti','Kaiti SC','楷体', serif; letter-spacing:0.04em;
}
.nav-tel-icon { font-size:1.5rem; color:#e02020; }
.nav-tel-ring {
  display:inline-flex; align-items:center; justify-content:center;
  animation: tel-ring 1.2s ease-in-out infinite;
}
@keyframes tel-ring {
  0%,100% { transform:rotate(0deg) scale(1); }
  10% { transform:rotate(18deg) scale(1.08); }
  20% { transform:rotate(-14deg) scale(1.12); }
  30% { transform:rotate(10deg) scale(1.06); }
  40% { transform:rotate(-6deg) scale(1); }
  50% { transform:rotate(0deg) scale(1); }
}
.nav-btn {
  padding:0.55rem 1.5rem; background:var(--green);
  color:var(--white) !important; border-radius:50px;
  font-size:var(--ts-1); font-weight:500; letter-spacing:var(--track-caption);
  transition:all 0.3s; white-space:nowrap;
  display:inline-flex; align-items:center; justify-content:center;
  min-height:40px;
}
.nav-btn:hover { background:var(--green-light); }

.nav-toggle { display:none; background:none; border:none; cursor:pointer; padding:0.3rem; }
.nav-toggle span {
  display:block; width:24px; height:2px; background:var(--green-deep);
  margin:5px 0; transition:all 0.3s; border-radius:2px;
}

/* ═════ MOBILE MENU ═════ */
.mobile-menu {
  position:fixed; inset:0; z-index:999;
  background:rgba(10,61,46,0.98); backdrop-filter:blur(16px);
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:1.6rem; opacity:0; pointer-events:none; transition:opacity 0.35s;
}
.mobile-menu.open { opacity:1; pointer-events:all; }
.mobile-menu a {
  font-size:var(--ts-3); color:var(--white); font-weight:500;
  padding:0.6rem 1.2rem; min-width:44px; min-height:44px;
  display:flex; align-items:center; justify-content:center;
}
.mobile-menu .nav-btn {
  margin-top:0.8rem; padding:0.8rem 2rem;
  min-width:44px; min-height:44px;
}
.mobile-close {
  position:absolute; top:1.2rem; right:1.2rem;
  background:rgba(255,255,255,0.1); border:1px solid rgba(255,255,255,0.2);
  color:var(--white); font-size:1.4rem; width:44px; height:44px;
  border-radius:50%; cursor:pointer; display:flex;
  align-items:center; justify-content:center;
  transition:background 0.3s;
}
.mobile-close:hover { background:rgba(255,255,255,0.2); }

/* ═════ BREADCRUMB ═════ */
.breadcrumb {
  max-width:1260px; margin:1.5rem auto 0; padding:0 clamp(1.5rem,4vw,3rem);
  font-size:var(--ts-1); color:var(--text-muted);
  font-family:var(--font-label);
}
.breadcrumb a { color:var(--green); transition:color 0.3s; }
.breadcrumb a:hover { color:var(--green-light); text-decoration:underline; }
.breadcrumb span { color:var(--text-muted); }

/* ═════ ARTICLE CONTENT ═════ */
.article-main {
  max-width:900px; margin:2rem auto 4rem;
  padding:0 clamp(1.5rem,4vw,3rem);
}
.article-main h1 {
  font-family:var(--font-display); font-size:var(--ts-5);
  font-weight:700; line-height:1.25; color:var(--green-deep);
  margin-bottom:1rem; letter-spacing:var(--track-heading);
}
.article-meta {
  display:flex; flex-wrap:wrap; gap:1rem;
  font-size:var(--ts-0); color:var(--text-muted);
  margin-bottom:2rem; padding-bottom:1.5rem;
  border-bottom:1px solid var(--sage-dark);
  font-family:var(--font-label);
}
.article-meta span { white-space:nowrap; }
.article-intro p {
  font-size:var(--ts-3); line-height:1.75; color:var(--green-deep);
  font-weight:300; margin-bottom:2.5rem;
  font-family:var(--font-display); font-style:italic;
}
.article-main section { margin-bottom:2.5rem; }
.article-main h2 {
  font-family:var(--font-display); font-size:var(--ts-4);
  font-weight:600; color:var(--green-deep);
  margin-bottom:0.8rem; margin-top:2rem;
  letter-spacing:var(--track-heading);
}
.article-main p {
  font-size:var(--ts-2); line-height:var(--leading-body);
  color:var(--text); margin-bottom:1rem;
}
.article-main strong { color:var(--green-deep); }

/* CTA Box */
.cta-box {
  background:var(--sage); border-radius:var(--radius-lg);
  padding:2.5rem; margin:3rem 0;
  border-left:4px solid var(--green);
}
.cta-box h3 {
  font-family:var(--font-display); font-size:var(--ts-4);
  font-weight:600; color:var(--green-deep); margin-bottom:1.2rem;
}
.cta-box p { font-size:var(--ts-1); color:var(--text); margin-bottom:0.4rem; }
.cta-box strong { color:var(--green-deep); font-size:var(--ts-3); }
.cta-box .cta-small {
  font-size:var(--ts-0); color:var(--text-muted);
  margin-top:1rem; font-style:italic;
}

/* Related Articles */
.related-articles {
  background:var(--off-white); border-radius:var(--radius-lg);
  padding:2rem 2.5rem; margin:2rem 0;
}
.related-articles h3 {
  font-size:var(--ts-3); font-weight:600;
  color:var(--green-deep); margin-bottom:1rem;
}
.related-articles ul { list-style:none; }
.related-articles ul li { margin-bottom:0.6rem; }
.related-articles ul li a {
  font-size:var(--ts-2); color:var(--green);
  transition:color 0.3s;
}
.related-articles ul li a:hover { color:var(--green-light); text-decoration:underline; }

/* Article Closing */
.article-closing {
  padding:1.5rem 0; margin-bottom:1rem;
  font-weight:500;
}
.article-closing p { font-size:var(--ts-2); color:var(--green-deep); }

/* ═════ FOOTER ═════ */
.footer {
  background:var(--green-deep); color:rgba(255,255,255,0.6);
  padding:4rem 0 0; margin-top:2rem;
}
.footer-grid {
  display:grid; grid-template-columns:2.2fr 1fr 1fr 1.6fr;
  gap:2.5rem; padding-bottom:2.5rem;
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.footer-brand p {
  font-size:var(--ts-1); line-height:1.8;
  opacity:0.6; font-weight:300; margin-top:1rem;
}
.footer-col h4 {
  font-size:var(--ts-2); font-weight:600; color:var(--white);
  margin-bottom:1rem; letter-spacing:var(--track-caption);
  font-family:var(--font-label);
}
.footer-col ul { list-style:none; }
.footer-col ul li { margin-bottom:0.6rem; }
.footer-col ul a {
  font-size:var(--ts-1); opacity:0.6; transition:all 0.3s; font-weight:300;
}
.footer-col ul a:hover { opacity:1; color:var(--gold-light); }
.footer-bottom {
  padding:1.6rem 0; display:flex; justify-content:space-between;
  flex-wrap:wrap; gap:1rem; font-size:var(--ts-0); opacity:0.45;
}
.footer-bottom a { opacity:0.7; transition:opacity 0.3s; }
.footer-bottom a:hover { opacity:1; }
.footer-icp { text-align:center; padding-top:0.5rem; padding-bottom:1.2rem; }
.footer-icp a { color:rgba(255,255,255,0.4); font-size:0.7rem; }
.footer-logo-img { width:390px; height:auto; border-radius:0; object-fit:contain; margin-bottom:1.2rem; display:block; }

/* ═════ FLOATING CALL ═════ */
.float-call-btn {
  position:fixed; bottom:24px; right:24px; z-index:9999;
  display:flex; align-items:center; gap:10px;
  background:rgba(255,255,255,0.92);
  backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
  border:1.5px solid #3B6D11; color:#3B6D11;
  padding:14px 22px; border-radius:32px;
  text-decoration:none; font-size:15px; font-weight:500;
  font-family:var(--font-label);
  box-shadow:0 4px 24px rgba(59,109,17,0.18);
  transition:transform 0.2s cubic-bezier(0.25,0.8,0.25,1.2), box-shadow 0.2s ease;
}
.float-call-btn:hover {
  transform:translateY(-2px);
  box-shadow:0 6px 32px rgba(59,109,17,0.28);
  background:rgba(255,255,255,0.98);
}
.float-call-btn:active { transform:scale(0.96); }
.float-call-icon { width:22px; height:22px; flex-shrink:0; }
.float-call-desk { display:inline; letter-spacing:0.3px; white-space:nowrap; }
.float-call-mobi { display:none; letter-spacing:0.5px; white-space:nowrap; }

/* ═════ UTILITY ═════ */
button, .nav-btn, .btn-submit { cursor:pointer; }
a, button { -webkit-tap-highlight-color:transparent; }
input, select, textarea { font-size:16px !important; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline:2px solid var(--green); outline-offset:2px; border-radius:2px;
}

/* ═════ RESPONSIVE ═════ */
/* Tablet ≤ 1024px */
@media (max-width:1024px) {
  .nav-menu, .nav-actions .nav-tel { display:none; }
  .top-links { display:none; }
  .top-bar .container { justify-content:center; }
  .nav-toggle { display:block; }
  .navbar .container { height:64px; }
  .nav-logo-img { height:44px !important; min-height:44px; max-height:none; }
  .footer-grid { grid-template-columns:1fr 1fr; gap:2rem; }
  .article-main h1 { font-size:clamp(1.6rem,2.5vw,2.2rem); }
}

/* Mobile ≤ 768px */
@media (max-width:768px) {
  .top-bar { display:none; }
  .navbar .container { height:58px; }
  .nav-logo-img { height:38px !important; min-height:38px; max-height:none; }
  .container { padding:0 1rem; }
  .article-main { padding:0 1rem; }
  .breadcrumb { padding:0 1rem; }
  .article-meta { flex-direction:column; gap:0.4rem; }
  .cta-box { padding:1.8rem; }
  .related-articles { padding:1.5rem; }
  .footer { padding:3rem 0 0; }
  .footer-grid { grid-template-columns:1fr; gap:2rem; }
  .footer-bottom { flex-direction:column; text-align:center; gap:0.5rem; font-size:0.72rem; }
  .footer-logo-img { width:280px; }
  .float-call-btn { bottom:20px; right:16px; padding:12px 18px; border-radius:28px; font-size:14px; gap:8px; }
  .float-call-icon { width:20px; height:20px; }
  .float-call-desk { display:none; }
  .float-call-mobi { display:inline; }
}

/* Small Mobile ≤ 480px */
@media (max-width:480px) {
  html { font-size:15px; }
  .mobile-menu { gap:1.2rem; }
  .mobile-menu a { font-size:1.1rem; }
  .article-main h1 { font-size:1.5rem; }
  .article-main h2 { font-size:1.15rem; }
  .article-main p { font-size:0.88rem; }
  .footer-grid { gap:1.5rem; }
  .footer-logo-img { width:240px; }
}

@supports (padding: env(safe-area-inset-bottom)) {
  .mobile-menu { padding-bottom:env(safe-area-inset-bottom); }
  .footer { padding-bottom:env(safe-area-inset-bottom); }
}