/* ===========================
   锦鑫友达环保科技 - 官网样式
   =========================== */

:root {
  --primary: #0a7c3e;
  --primary-dark: #065c2d;
  --primary-light: #12a355;
  --accent: #f5a623;
  --accent-dark: #e09510;
  --dark: #1a1a2e;
  --dark2: #16213e;
  --gray: #6b7280;
  --gray-light: #f3f4f6;
  --white: #ffffff;
  --text: #2d3748;
  --border: #e5e7eb;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 48px rgba(0,0,0,0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: #fff;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 80px 0; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10,124,62,0.35);
}
.btn-outline {
  border-color: rgba(255,255,255,0.8);
  color: #fff;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(4px);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.25);
  transform: translateY(-2px);
}
.btn-full { width: 100%; justify-content: center; }

/* ===== Section Header ===== */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header.light h2,
.section-header.light p { color: #fff; }
.section-header.light .section-tag {
  background: rgba(255,255,255,0.2);
  color: #fff;
}
.section-tag {
  display: inline-block;
  background: rgba(10,124,62,0.1);
  color: var(--primary);
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.section-header h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}
.section-header p {
  font-size: 16px;
  color: var(--gray);
}

/* ===== Header / Nav ===== */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10,30,20,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
}
#header.scrolled {
  background: rgba(6,20,14,0.98);
  box-shadow: var(--shadow);
}
#header .container {
  display: flex;
  align-items: center;
  height: 70px;
  gap: 32px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-icon {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  color: #fff;
}
.logo-text { display: flex; flex-direction: column; }
.logo-main {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}
.logo-sub {
  font-size: 11px;
  color: rgba(255,255,255,0.55);
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav-menu a {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  border-radius: 8px;
  transition: var(--transition);
}
.nav-menu a:hover, .nav-menu a.active {
  color: #fff;
  background: rgba(255,255,255,0.1);
}
.nav-phone {
  flex-shrink: 0;
  font-size: 14px;
  color: var(--accent);
  font-weight: 600;
}
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: #fff;
  cursor: pointer;
  margin-left: auto;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: 
    linear-gradient(135deg, #0d3321 0%, #0a4d30 40%, #065c2d 100%);
}
.hero-bg::before {
  content: '';
  position: absolute; inset: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(18,163,85,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(245,166,35,0.08) 0%, transparent 40%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 60%, rgba(6,18,12,0.4));
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 100px 24px 60px;
  margin: 0 auto;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  background: rgba(245,166,35,0.15);
  border: 1px solid rgba(245,166,35,0.4);
  color: var(--accent);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 28px;
  letter-spacing: 0.5px;
}
.hero-content h1 {
  font-size: clamp(32px, 5vw, 58px);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 40px;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}
.stat-item {
  text-align: center;
}
.stat-num {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}
.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: rgba(255,255,255,0.4);
  font-size: 12px;
  z-index: 2;
}
.scroll-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid rgba(255,255,255,0.3);
  border-bottom: 2px solid rgba(255,255,255,0.3);
  transform: rotate(45deg);
  margin: 8px auto 0;
  animation: bounce 1.5s infinite;
}
@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(5px); }
}

/* ===== About ===== */
.about { background: #fff; }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-img {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-img img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.about-img:hover img { transform: scale(1.04); }
.about-img-badge {
  position: absolute;
  bottom: 24px; right: 24px;
  background: var(--primary);
  color: #fff;
  padding: 12px 20px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.about-img-badge span { font-size: 12px; display: block; opacity: 0.8; }
.about-img-badge strong { font-size: 28px; font-weight: 800; display: block; line-height: 1; }
.about-content h3 {
  font-size: 26px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
}
.about-content p {
  color: var(--gray);
  margin-bottom: 16px;
  line-height: 1.8;
}
.about-certs {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.cert-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  background: var(--gray-light);
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
}
.cert-icon { font-size: 24px; flex-shrink: 0; }
.cert-info { display: flex; flex-direction: column; }
.cert-info strong { font-size: 14px; color: var(--dark); }
.cert-info span { font-size: 13px; color: var(--gray); margin-top: 2px; }

/* ===== Services ===== */
.services {
  background: linear-gradient(160deg, #0a4d30 0%, #065c2d 100%);
  padding: 80px 0;
}
.services-tabs { }
.tab-nav {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 12px 28px;
  border: 2px solid rgba(255,255,255,0.3);
  background: transparent;
  color: rgba(255,255,255,0.7);
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}
.tab-btn:hover {
  border-color: rgba(255,255,255,0.6);
  color: #fff;
}
.tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.tab-content { display: none; }
.tab-content.active { display: block; }
.service-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.service-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.service-img img {
  width: 100%;
  height: 380px;
  object-fit: cover;
}
.service-info { color: #fff; }
.service-num {
  font-size: 80px;
  font-weight: 900;
  color: rgba(255,255,255,0.1);
  line-height: 1;
  margin-bottom: -20px;
}
.service-info h3 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 16px;
}
.service-info > p {
  color: rgba(255,255,255,0.75);
  margin-bottom: 28px;
  line-height: 1.8;
}
.service-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.feat-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 18px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius);
  transition: var(--transition);
}
.feat-item:hover { background: rgba(255,255,255,0.14); }
.feat-icon { font-size: 22px; flex-shrink: 0; }
.feat-item strong { font-size: 14px; display: block; }
.feat-item span { font-size: 13px; color: rgba(255,255,255,0.65); display: block; margin-top: 2px; }

/* ===== Standards ===== */
.standards { background: var(--gray-light); }
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 40px;
}
.std-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
.std-table th {
  background: var(--primary);
  color: #fff;
  padding: 16px 20px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
}
.std-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.6;
}
.std-table tr:last-child td { border-bottom: none; }
.std-table tr:hover td { background: #f9fafb; }
.badge {
  display: inline-block;
  background: rgba(10,124,62,0.1);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}
.std-extra {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.std-item {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
}
.std-icon { font-size: 32px; margin-bottom: 10px; }
.std-item strong { display: block; font-size: 15px; color: var(--dark); margin-bottom: 4px; }
.std-item span { font-size: 13px; color: var(--gray); }

/* ===== Advantages ===== */
.advantages {
  background: linear-gradient(160deg, #1a1a2e 0%, #16213e 100%);
}
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.adv-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.adv-card:hover {
  transform: translateY(-6px);
  border-color: rgba(10,124,62,0.4);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}
.adv-img {
  height: 180px;
  overflow: hidden;
}
.adv-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.adv-card:hover .adv-img img { transform: scale(1.06); }
.adv-body {
  padding: 20px;
}
.adv-icon { font-size: 28px; margin-bottom: 10px; }
.adv-body h3 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}
.adv-body p {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
}
.adv-card.featured {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px 24px;
  text-align: center;
  background: rgba(10,124,62,0.12);
  border-color: rgba(10,124,62,0.3);
  position: relative;
  overflow: visible;
}
.adv-icon-large { font-size: 48px; margin-bottom: 14px; }
.adv-card.featured h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}
.adv-card.featured p {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  line-height: 1.7;
}
.cert-badge, .support-badge {
  margin-top: 20px;
  background: var(--primary);
  color: #fff;
  padding: 12px 20px;
  border-radius: 12px;
  font-size: 20px;
  font-weight: 800;
  text-align: center;
  line-height: 1.3;
}
.cert-badge small, .support-badge small { font-size: 11px; font-weight: 400; display: block; opacity: 0.85; }

/* ===== System ===== */
.system { background: #fff; }
.system-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.flow-step {
  flex: 1;
  min-width: 180px;
  max-width: 240px;
  text-align: center;
  padding: 28px 20px;
  background: var(--gray-light);
  border-radius: var(--radius-lg);
  border-bottom: 4px solid var(--primary);
  transition: var(--transition);
}
.flow-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.flow-icon { font-size: 36px; margin-bottom: 12px; }
.flow-step h4 { font-size: 15px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.flow-step p { font-size: 13px; color: var(--gray); line-height: 1.6; }
.flow-arrow { font-size: 24px; color: var(--primary); font-weight: 700; flex-shrink: 0; }
.system-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.system-img img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

/* ===== Cases ===== */
.cases {
  background: linear-gradient(160deg, #0a4d30 0%, #073c25 100%);
}
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}
.case-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}
.case-img {
  position: relative;
  height: 220px;
  overflow: hidden;
}
.case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.case-card:hover .case-img img { transform: scale(1.06); }
.case-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(10,77,48,0.85), transparent);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}
.case-overlay span {
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
}
.case-body { padding: 20px; }
.case-body h3 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.case-body p { font-size: 13px; color: rgba(255,255,255,0.65); margin-bottom: 14px; line-height: 1.6; }
.case-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.case-tags span {
  background: rgba(245,166,35,0.15);
  border: 1px solid rgba(245,166,35,0.3);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 500;
}

.typical-case {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 40px;
}
.typical-header { margin-bottom: 24px; }
.typical-tag {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
}
.typical-header h3 { font-size: 20px; font-weight: 700; color: #fff; }
.typical-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.typical-col h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 14px; }
.typical-col ul { padding-left: 16px; }
.typical-col li { font-size: 13px; color: rgba(255,255,255,0.7); margin-bottom: 10px; line-height: 1.7; }

.dust-standard {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.dust-standard h3 { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.std-note { font-size: 13px; color: rgba(255,255,255,0.55); margin-bottom: 24px; }
.dust-levels {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.level-item {
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
}
.level-1 { background: rgba(34,197,94,0.15); border: 1px solid rgba(34,197,94,0.3); }
.level-2 { background: rgba(234,179,8,0.15); border: 1px solid rgba(234,179,8,0.3); }
.level-3 { background: rgba(249,115,22,0.15); border: 1px solid rgba(249,115,22,0.3); }
.level-4 { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3); }
.level-range { display: block; font-size: 13px; color: rgba(255,255,255,0.65); margin-bottom: 8px; }
.level-label { display: block; font-size: 32px; font-weight: 900; line-height: 1; margin-bottom: 6px; }
.level-1 .level-label { color: #22c55e; }
.level-2 .level-label { color: #eab308; }
.level-3 .level-label { color: #f97316; }
.level-4 .level-label { color: #ef4444; }
.level-desc { font-size: 12px; color: rgba(255,255,255,0.5); }

/* ===== Cooperation ===== */
.cooperation { background: var(--gray-light); }
.coop-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.coop-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-bottom: 4px solid transparent;
}
.coop-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.coop-icon { font-size: 48px; margin-bottom: 16px; }
.coop-card h3 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.coop-card p { font-size: 14px; color: var(--gray); line-height: 1.7; }
.coop-banner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 280px;
  box-shadow: var(--shadow-lg);
}
.coop-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.coop-banner-text {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 32px;
  background: linear-gradient(to top, rgba(6,18,12,0.9), transparent);
  color: #fff;
}
.coop-banner-text h3 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.coop-banner-text p { font-size: 15px; color: rgba(255,255,255,0.75); }

/* ===== Value ===== */
.value {
  background: linear-gradient(160deg, #1a1a2e 0%, #0a4d30 100%);
}
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}
.value-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
}
.value-card:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-4px);
}
.value-icon { font-size: 48px; margin-bottom: 16px; }
.value-card h3 { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.value-card p { font-size: 14px; color: rgba(255,255,255,0.65); line-height: 1.8; }
.vision-quote {
  background: rgba(245,166,35,0.08);
  border: 1px solid rgba(245,166,35,0.2);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
}
.quote-icon {
  font-size: 80px;
  color: var(--accent);
  line-height: 0.7;
  flex-shrink: 0;
  font-family: Georgia, serif;
}
.quote-text p {
  font-size: 17px;
  color: rgba(255,255,255,0.85);
  line-height: 1.8;
  margin-bottom: 12px;
}
.quote-text span {
  font-size: 14px;
  color: var(--accent);
  font-weight: 600;
}

/* ===== Contact ===== */
.contact { background: #fff; }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}
.contact-info h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 28px;
}
.contact-items { display: flex; flex-direction: column; gap: 18px; margin-bottom: 32px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  background: var(--gray-light);
  border-radius: var(--radius);
}
.ci-icon { font-size: 22px; flex-shrink: 0; }
.contact-item strong { display: block; font-size: 13px; color: var(--gray); margin-bottom: 2px; }
.contact-item span, .contact-item a {
  font-size: 15px;
  font-weight: 600;
  color: var(--dark);
}
.contact-item a:hover { color: var(--primary); }
.contact-slogan {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  padding: 20px 24px;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  text-align: center;
  letter-spacing: 2px;
}
.contact-form h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 24px;
}
.contact-form form { display: flex; flex-direction: column; gap: 14px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 13px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  transition: var(--transition);
  outline: none;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(10,124,62,0.1);
}
.contact-form textarea { resize: vertical; min-height: 110px; }

/* ===== Footer ===== */
.footer {
  background: #0a1a10;
  color: rgba(255,255,255,0.7);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.footer-logo .logo-icon {
  width: 40px; height: 40px;
  font-size: 18px;
}
.footer-logo span {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 16px;
}
.footer-cert {
  background: rgba(10,124,62,0.15);
  border: 1px solid rgba(10,124,62,0.3);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 12px;
  color: rgba(255,255,255,0.6);
  display: inline-block;
}
.footer-links h4 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-links ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-links a, .footer-links span {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--primary-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-bottom a { color: rgba(255,255,255,0.6); }
.footer-bottom a:hover { color: var(--primary-light); }

/* ===== Back to Top ===== */
.back-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 44px; height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: var(--transition);
  opacity: 0;
  pointer-events: none;
  z-index: 999;
}
.back-top.visible {
  opacity: 1;
  pointer-events: all;
}
.back-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .nav-menu { display: none; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0; background: rgba(6,18,12,0.98); padding: 16px; gap: 4px; }
  .nav-menu.open { display: flex; }
  .nav-phone { display: none; }
  .menu-toggle { display: block; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .service-detail { grid-template-columns: 1fr; gap: 28px; }
  .service-img { height: 240px; }
  .service-img img { height: 240px; }
  .adv-grid { grid-template-columns: 1fr 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .coop-grid { grid-template-columns: 1fr; }
  .value-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .form-row { grid-template-columns: 1fr; }
  .dust-levels { grid-template-columns: 1fr 1fr; }
  .std-extra { grid-template-columns: 1fr 1fr; }
  .system-flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .typical-body { grid-template-columns: 1fr; gap: 20px; }
  .vision-quote { flex-direction: column; }
  .hero-stats { gap: 24px; }
  .back-top { bottom: 20px; right: 20px; }
}

@media (max-width: 480px) {
  .adv-grid { grid-template-columns: 1fr; }
  .dust-levels { grid-template-columns: 1fr 1fr; }
  .hero-btns { flex-direction: column; align-items: center; }
  .tab-nav { gap: 6px; }
  .tab-btn { padding: 10px 18px; font-size: 13px; }
}