/* ===== 易环智能 - AI+环保 全局样式 ===== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;900&display=swap');

:root {
  --ai-blue: #0F3B22;
  --ai-dark: #1A3326;
  --eco-green: #1E6B3A;
  --eco-light: #8DC670;
  --cyan: #3BA563;
  --deep: #1A3326;
  --gray-900: #111827;
  --gray-800: #1f2937;
  --gray-700: #374151;
  --gray-600: #4b5563;
  --gray-400: #9ca3af;
  --gray-300: #d1d5db;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --gray-50: #f9fafb;
  --white: #ffffff;
}

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

html {
  scroll-behavior: smooth;
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

body { color: var(--gray-900); background: var(--white); overflow-x: hidden; }

/* ===== Navigation ===== */
.navbar {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
}
.navbar .logo { display: flex; align-items: center; gap: 0.75rem; text-decoration: none; }
.logo-icon {
  width: 40px; height: 40px; border-radius: 10px; object-fit: contain;
}
.navbar .logo-text { font-size: 1.5rem; font-weight: 700; color: var(--eco-deep); }
.nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; }
.nav-links a {
  text-decoration: none; color: var(--gray-600); font-size: 0.95rem;
  font-weight: 500; transition: color 0.2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--eco-green); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--eco-green), var(--eco-light));
}
.nav-cta {
  background: linear-gradient(135deg, var(--eco-green), var(--cyan));
  color: white; font-weight: 600; padding: 0.5rem 1.5rem; border-radius: 0.5rem;
  text-decoration: none; transition: all 0.3s;
  box-shadow: 0 4px 14px rgba(5,150,105,0.35);
}
.nav-cta:hover { box-shadow: 0 6px 20px rgba(5,150,105,0.5); transform: translateY(-1px); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; color: var(--gray-800); }

@media (max-width: 767px) {
  .nav-links { display: none; }
  .nav-cta.desktop { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 72px;
    left: 0; right: 0; background: rgba(255,255,255,0.98);
    padding: 1.5rem; gap: 1rem;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  }
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  background: linear-gradient(160deg, #042f1e 0%, #1A3326 30%, #0a5c3a 60%, #042f1e 100%);
}

/* Digital grid overlay (AI neural network feel) */
.hero::before {
  content: ''; position: absolute; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(59,165,99,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,165,99,0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 70%);
}

/* Green glow orbs */
.hero-glow-1 {
  position: absolute; top: 15%; left: 10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(5,150,105,0.3) 0%, transparent 70%);
  border-radius: 50%; filter: blur(60px);
  animation: glowPulse 6s ease-in-out infinite;
}
.hero-glow-2 {
  position: absolute; bottom: 20%; right: 5%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(141,198,112,0.22) 0%, transparent 70%);
  border-radius: 50%; filter: blur(80px);
  animation: glowPulse 8s ease-in-out -3s infinite;
}
.hero-glow-3 {
  position: absolute; top: 50%; left: 40%;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(59,165,99,0.18) 0%, transparent 70%);
  border-radius: 50%; filter: blur(60px);
  animation: glowPulse 7s ease-in-out -5s infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* Data flow particles */
.hero-particles {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
}
.hero-particle {
  position: absolute; border-radius: 50%;
  background: linear-gradient(135deg, var(--eco-light), var(--cyan));
  animation: particleFlow 7s linear infinite;
  box-shadow: 0 0 8px rgba(141,198,112,0.5);
}
.hero-particle:nth-child(1)  { width: 5px; height: 5px; top: 15%; left: 10%; animation-delay: 0s; }
.hero-particle:nth-child(2)  { width: 3px; height: 3px; top: 28%; left: 35%; animation-delay: -1s; }
.hero-particle:nth-child(3)  { width: 6px; height: 6px; top: 22%; left: 65%; animation-delay: -2s; }
.hero-particle:nth-child(4)  { width: 4px; height: 4px; top: 45%; left: 80%; animation-delay: -3s; }
.hero-particle:nth-child(5)  { width: 5px; height: 5px; top: 58%; left: 22%; animation-delay: -4s; }
.hero-particle:nth-child(6)  { width: 3px; height: 3px; top: 65%; left: 55%; animation-delay: -5s; }
.hero-particle:nth-child(7)  { width: 6px; height: 6px; top: 75%; left: 72%; animation-delay: -6s; }
.hero-particle:nth-child(8)  { width: 4px; height: 4px; top: 82%; left: 18%; animation-delay: -7s; }
.hero-particle:nth-child(9)  { width: 5px; height: 5px; top: 35%; left: 48%; animation-delay: -2.5s; }
.hero-particle:nth-child(10) { width: 3px; height: 3px; top: 88%; left: 88%; animation-delay: -5.5s; }

@keyframes particleFlow {
  0%   { transform: translate(0, 0) scale(1); opacity: 0.3; }
  25%  { transform: translate(40px, -25px) scale(1.5); opacity: 0.9; }
  50%  { transform: translate(-15px, -50px) scale(0.7); opacity: 0.3; }
  75%  { transform: translate(-30px, -15px) scale(1.4); opacity: 0.8; }
  100% { transform: translate(10px, -35px) scale(1); opacity: 0.3; }
}

/* Water ripple rings */
.hero-ripple {
  position: absolute; border-radius: 50%;
  border: 1px solid rgba(141,198,112,0.3);
  animation: rippleExpand 6s ease-out infinite;
  pointer-events: none; z-index: 1;
}
.hero-ripple:nth-child(1) { width: 220px; height: 220px; top: 18%; left: 12%; animation-delay: 0s; }
.hero-ripple:nth-child(2) { width: 320px; height: 320px; top: 48%; right: 8%; animation-delay: -2s; border-color: rgba(59,165,99,0.25); }
.hero-ripple:nth-child(3) { width: 180px; height: 180px; bottom: 22%; left: 38%; animation-delay: -4s; border-color: rgba(141,198,112,0.3); }

@keyframes rippleExpand {
  0%   { transform: scale(0.3); opacity: 0; }
  20%  { transform: scale(1); opacity: 0.5; }
  50%  { transform: scale(2); opacity: 0.12; }
  100% { transform: scale(3); opacity: 0; }
}

.hero-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center;
}
@media (max-width: 1023px) { .hero-grid { grid-template-columns: 1fr; } .hero { padding-top: 80px; } }

.hero-badge {
  display: inline-block;
  background: rgba(141,198,112,0.18); backdrop-filter: blur(4px);
  border: 1px solid rgba(141,198,112,0.35); border-radius: 9999px;
  padding: 0.3rem 1.2rem; font-size: 0.875rem; color: rgba(255,255,255,0.9);
  margin-bottom: 1.5rem; letter-spacing: 0.05em;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.75rem); font-weight: 900;
  line-height: 1.15; color: white; margin-bottom: 1.5rem;
}
.hero-title .highlight {
  background: linear-gradient(135deg, #8DC670, #3BA563);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem); color: var(--gray-200);
  margin-bottom: 2rem; max-width: 540px;
}

.hero-features {
  list-style: none; display: flex; flex-direction: column; gap: 0.75rem;
  margin-bottom: 2rem;
}
.hero-features li {
  display: flex; align-items: center; gap: 0.75rem;
  color: var(--gray-200); font-size: 1.05rem;
}
.hero-features li::before {
  content: ''; width: 10px; height: 10px; border-radius: 50%;
  background: linear-gradient(135deg, #8DC670, #3BA563);
  flex-shrink: 0; box-shadow: 0 0 8px rgba(141,198,112,0.5);
}

.hero-buttons { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn-primary {
  background: linear-gradient(135deg, var(--eco-green), var(--cyan));
  color: white; font-weight: 700; padding: 1rem 2rem; border-radius: 0.5rem;
  text-decoration: none; font-size: 1.1rem; transition: all 0.3s;
  box-shadow: 0 8px 24px rgba(5,150,105,0.4); border: none; cursor: pointer;
  display: inline-block;
}
.btn-primary:hover { box-shadow: 0 12px 28px rgba(5,150,105,0.55); transform: translateY(-2px); }

.btn-outline {
  background: transparent; color: white; font-weight: 600;
  padding: 1rem 2rem; border-radius: 0.5rem; text-decoration: none;
  font-size: 1.1rem; border: 2px solid rgba(141,198,112,0.5);
  transition: all 0.3s; display: inline-block;
}
.btn-outline:hover { background: rgba(141,198,112,0.15); border-color: var(--eco-light); }

.hero-card {
  background: rgba(255,255,255,0.06); backdrop-filter: blur(12px);
  border: 1px solid rgba(141,198,112,0.25); border-radius: 1rem;
  padding: 2rem; text-align: center; color: white;
}
.hero-card-icon {
  width: 80px; height: 80px; margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--eco-green), var(--ai-blue));
  border-radius: 1rem; display: flex; align-items: center; justify-content: center;
}

.hero-card-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 0.5rem; }
.hero-card-desc { color: var(--gray-300); }

/* ===== Card Tags ===== */
.card-tag {
  display: inline-block; font-size: 0.75rem; font-weight: 600;
  padding: 0.15rem 0.75rem; border-radius: 9999px; margin-bottom: 0.75rem;
}
.card-tag.blue   { color: #0F3B22; background: #E8F3E8; }
.card-tag.teal   { color: #1E6B3A; background: #E8F3E8; }
.card-tag.green  { color: #1E6B3A; background: #E8F3E8; }
.card-tag.purple { color: #0F3B22; background: #E8F3E8; }

/* ===== Case Studies ===== */
.case-box {
  background: white; border-radius: 1rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06); overflow: hidden; margin-bottom: 2rem;
}
.case-left, .case-right { padding: 2.5rem; display: flex; flex-direction: column; justify-content: center; }
.case-left { color: white; }
.case-left.slate  { background: linear-gradient(135deg, #1e293b, #0f172a); }
.case-left.blue   { background: linear-gradient(135deg, #1A3326, #1A3326); }
.case-left.green  { background: linear-gradient(135deg, #1E6B3A, #1A3326); }

.case-tag { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.5rem; }
.case-tag.cyan  { color: #3BA563; }
.case-tag.blue  { color: #3BA563; }
.case-tag.green { color: #3BA563; }
.case-title { font-size: 1.8rem; font-weight: 700; margin-bottom: 0.75rem; }
.case-subtitle { opacity: 0.85; margin-bottom: 1.5rem; line-height: 1.6; }

.case-points { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.case-points li { display: flex; align-items: center; gap: 0.75rem; opacity: 0.9; }
.case-points li::before { content: ''; width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.case-points.cyan li::before  { background: #3BA563; box-shadow: 0 0 6px rgba(94,234,212,0.5); }
.case-points.blue li::before  { background: #3BA563; }
.case-points.green li::before { background: #3BA563; box-shadow: 0 0 6px rgba(110,231,183,0.5); }

.case-right h4 { font-weight: 600; margin-bottom: 1rem; color: var(--gray-900); }
.case-right p  { color: var(--gray-600); line-height: 1.7; margin-bottom: 1rem; }

.case-highlight {
  border-left: 4px solid var(--eco-green); background: #ecfdf5;
  padding: 1rem 1.25rem; border-radius: 0 0.5rem 0.5rem 0;
  color: #1A3326; font-size: 0.9rem; line-height: 1.5;
}
.case-highlight.blue { border-color: var(--ai-blue); background: #f0fdfa; color: #1A3326; }

/* ===== Timeline ===== */
.timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
@media (max-width: 1023px) { .timeline { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 639px)  { .timeline { grid-template-columns: 1fr; } }

.timeline-item { border-radius: 0.75rem; padding: 1.5rem; color: white; position: relative; }
.timeline-item:nth-child(1) { background: linear-gradient(135deg, #1E6B3A, #047857); }
.timeline-item:nth-child(2) { background: linear-gradient(135deg, #0F3B22, #1A3326); }
.timeline-item:nth-child(3) { background: linear-gradient(135deg, #0F3B22, #1A3326); }
.timeline-item:nth-child(4) { background: linear-gradient(135deg, #3BA563, #0F3B22); }
.timeline-item .day  { font-size: 0.8rem; opacity: 0.8; margin-bottom: 0.5rem; }
.timeline-item .title { font-weight: 700; font-size: 1.1rem; margin-bottom: 0.5rem; }
.timeline-item .desc  { font-size: 0.875rem; opacity: 0.9; line-height: 1.5; }

/* ===== Target Bar ===== */
.target-bar {
  background: linear-gradient(135deg, #1E6B3A, #0F3B22, #3BA563);
  border-radius: 1rem; padding: 2.5rem; text-align: center; color: white;
}
.target-bar .title { font-size: 1.5rem; font-weight: 700; margin-bottom: 2rem; }
.target-values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.target-values .val { font-size: 3rem; font-weight: 700; margin-bottom: 0.25rem; }
.target-values .lbl { opacity: 0.85; font-size: 0.95rem; }

/* ===== ROI Section ===== */
.roi-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
@media (max-width: 1023px) { .roi-grid { grid-template-columns: 1fr; } }

.roi-table { background: #FFFFFF; border: 1px solid var(--gray-200); border-radius: 0.75rem; padding: 1.5rem; box-shadow: 0 2px 12px rgba(15,59,34,0.04); }
.roi-table .row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.75rem 0; border-bottom: 1px solid var(--gray-100);
}
.roi-table .row:last-child {
  border-bottom: none; background: rgba(30,107,58,0.07);
  margin: 0.5rem -1rem -0.5rem; padding: 0.75rem 1.5rem; border-radius: 0.5rem;
}
.roi-table .row .label { color: var(--gray-600); }
.roi-table .row .value { font-weight: 700; color: #1E6B3A; }
.roi-table .row.total .value { font-size: 1.25rem; color: #0F3B22; }

.roi-box { background: #FFFFFF; border: 1px solid var(--gray-200); border-radius: 0.75rem; padding: 1.5rem; box-shadow: 0 2px 12px rgba(15,59,34,0.04); }
.roi-box .invest { margin-bottom: 1.5rem; }
.roi-box .invest-label { color: var(--gray-500); font-size: 0.875rem; }
.roi-box .invest-value { font-size: 1.875rem; font-weight: 700; color: var(--gray-900); }
.roi-box .invest-note  { color: var(--gray-500); font-size: 0.8rem; margin-top: 0.25rem; }

.roi-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.roi-metric {
  background: rgba(30,107,58,0.06); border-radius: 0.5rem;
  padding: 1rem; text-align: center;
}
.roi-metric .label { color: var(--gray-500); font-size: 0.8rem; margin-bottom: 0.25rem; }
.roi-metric .value { font-size: 1.5rem; font-weight: 700; color: #0F3B22; }
.roi-metric .value.green { color: #1E6B3A; }

/* ===== Cooperation ===== */
.coop-card {
  background: white; border-radius: 1rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06); padding: 2rem; position: relative;
}
.coop-card:nth-child(1) { border-top: 4px solid var(--eco-green); }
.coop-card:nth-child(2) { border-top: 4px solid var(--ai-blue); }
.coop-card:nth-child(3) { border-top: 4px solid #0F3B22; }

.coop-number {
  width: 48px; height: 48px; border-radius: 50%; color: white;
  font-weight: 700; font-size: 1.25rem;
  display: flex; align-items: center; justify-content: center;
  margin-top: -3rem; margin-bottom: 1rem;
}
.coop-card:nth-child(1) .coop-number { background: var(--eco-green); }
.coop-card:nth-child(2) .coop-number { background: var(--ai-blue); }
.coop-card:nth-child(3) .coop-number { background: #0F3B22; }

.coop-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 1rem; color: var(--gray-900); }
.coop-card ul { list-style: none; color: var(--gray-600); font-size: 0.95rem; display: flex; flex-direction: column; gap: 0.5rem; }
.coop-card ul li::before { content: '\2022'; margin-right: 0.5rem; font-weight: 700; }
.coop-card:nth-child(1) ul li::before { color: var(--eco-green); }
.coop-card:nth-child(2) ul li::before { color: var(--ai-blue); }
.coop-card:nth-child(3) ul li::before { color: #0F3B22; }

/* ===== Contact ===== */
.contact-info-item { display: flex; align-items: flex-start; gap: 1rem; margin-bottom: 1.5rem; }

.contact-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: white; flex-shrink: 0;
}
.contact-icon.blue   { background: #0F3B22; }
.contact-icon.teal   { background: var(--eco-green); }
.contact-icon.green  { background: var(--eco-green); }
.contact-icon.purple { background: #0F3B22; }

.contact-info-item h3 { font-size: 1.05rem; font-weight: 600; color: var(--gray-900); margin-bottom: 0.25rem; }
.contact-info-item p  { color: var(--gray-600); }
.contact-info-item .note { font-size: 0.8rem; color: var(--gray-400); }

.contact-form-box {
  background: white; border-radius: 1rem;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06); padding: 2rem;
  border: 1px solid var(--gray-100);
}
.contact-form-box h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 1.5rem; color: var(--gray-900); }

.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block; font-size: 0.875rem; font-weight: 500;
  color: var(--gray-700); margin-bottom: 0.25rem;
}
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--gray-300);
  border-radius: 0.5rem; font-size: 1rem; font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s; outline: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--eco-green);
  box-shadow: 0 0 0 3px rgba(5,150,105,0.12);
}
.form-group textarea { resize: vertical; min-height: 100px; }

.btn-submit {
  width: 100%; background: linear-gradient(135deg, var(--eco-green), var(--cyan));
  color: white; font-weight: 700; padding: 0.75rem 1.5rem;
  border-radius: 0.5rem; border: none; font-size: 1rem; cursor: pointer;
  transition: all 0.3s; box-shadow: 0 4px 14px rgba(5,150,105,0.3);
}
.btn-submit:hover { box-shadow: 0 8px 22px rgba(5,150,105,0.45); transform: translateY(-1px); }

/* ===== Footer ===== */
.footer { background: var(--deep); color: white; padding: 3rem 0 1.5rem; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
@media (max-width: 1023px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 639px)  { .footer-grid { grid-template-columns: 1fr; } }

.footer h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 1rem; }
.footer a  { color: var(--gray-400); text-decoration: none; display: block; margin-bottom: 0.5rem; transition: color 0.2s; }
.footer a:hover { color: var(--eco-light); }
.footer .brand-desc { color: var(--gray-400); margin-top: 0.5rem; line-height: 1.65; }
.footer-bottom { border-top: 1px solid var(--gray-800); padding-top: 1.5rem; text-align: center; color: var(--gray-400); font-size: 0.875rem; }

/* ===== Page Header ===== */
.page-header {
  padding: 8rem 0 3rem; text-align: center; color: white;
  background: linear-gradient(160deg, #042f1e 0%, #1A3326 50%, #0a5c3a 100%);
  position: relative; overflow: hidden;
}
.page-header::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(59,165,99,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,165,99,0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}
.page-header h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 0.75rem; position: relative; z-index: 1; }
.page-header p  { font-size: 1.125rem; color: var(--gray-300); max-width: 36rem; margin: 0 auto; position: relative; z-index: 1; }

/* ===== Hover Effects ===== */
.card-hover {
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.card-hover:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px -12px rgba(5,150,105,0.18), 0 4px 12px rgba(0,0,0,0.06);
}

.card-hover-dark {
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.card-hover-dark:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.25);
  background: rgba(255,255,255,0.07);
}

.scale-hover {
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.scale-hover:hover {
  transform: scale(1.04);
}

/* Timeline hover */
.timeline-item {
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), box-shadow 0.3s ease;
}
.timeline-item:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 12px 28px rgba(0,0,0,0.2);
}

/* Coop card hover */
.coop-card {
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.coop-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 36px rgba(5,150,105,0.12);
}

/* Contact info hover */
.contact-info-item {
  transition: transform 0.3s ease, background 0.3s ease;
  padding: 0.75rem;
  margin-left: -0.75rem;
  margin-right: -0.75rem;
  border-radius: 0.75rem;
}
.contact-info-item:hover {
  transform: translateX(6px);
  background: #f0fdf4;
}

/* Form input focus enhancement */
.form-group input, .form-group textarea, .form-group select {
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  transform: translateY(-1px);
}

/* Button hover enhancement */
.btn-primary, .btn-outline, .btn-submit, .nav-cta {
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.btn-primary:active, .btn-outline:active, .btn-submit:active, .nav-cta:active {
  transform: translateY(0) scale(0.98);
}

/* Nav link hover underline animation */
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--eco-green), var(--eco-light));
  transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.nav-links a:hover::after {
  width: 100%;
}
.nav-links a.active::after {
  width: 100%;
  background: linear-gradient(90deg, var(--eco-green), var(--eco-light));
}

/* Case box hover */
.case-box {
  transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94), box-shadow 0.35s ease;
}
.case-box:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.1);
}

/* Footer link hover */
.footer a {
  transition: color 0.25s ease, transform 0.25s ease;
  display: inline-block;
}
.footer a:hover {
  transform: translateX(3px);
}

/* Logo hover */
.navbar .logo {
  transition: opacity 0.3s ease;
}
.navbar .logo:hover {
  opacity: 0.85;
}

/* ===== Animations ===== */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}
.animate-float { animation: float 4s ease-in-out infinite; }

@keyframes subtlePulse {
  0%, 100% { box-shadow: 0 4px 14px rgba(5,150,105,0.35); }
  50% { box-shadow: 0 4px 24px rgba(5,150,105,0.55); }
}
.pulse-glow {
  animation: subtlePulse 2.5s ease-in-out infinite;
}

/* ===== 图片动画与蒙版增强 ===== */
/* Ken Burns 缓慢缩放平移（用于 hero 主图，营造呼吸感） */
@keyframes kenBurns {
  0%   { transform: scale(1) translate(0, 0); }
  100% { transform: scale(1.1) translate(-1.5%, -1.5%); }
}
.kenburns { animation: kenBurns 20s ease-out infinite alternate; }

/* 滚动渐入 */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .8s cubic-bezier(.25,.46,.45,.94), transform .8s cubic-bezier(.25,.46,.45,.94); }
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal-d1 { transition-delay: .1s; }
.reveal-d2 { transition-delay: .2s; }
.reveal-d3 { transition-delay: .3s; }

/* 视差背景（section 背景图固定滚动差） */
.parallax-bg { background-attachment: fixed; background-size: cover; background-position: center; background-repeat: no-repeat; }
@media (max-width: 767px) { .parallax-bg { background-attachment: scroll; } }

/* 图片悬停缓慢放大 */
.img-zoom { overflow: hidden; }
.img-zoom img { transition: transform .7s cubic-bezier(.25,.46,.45,.94); }
.img-zoom:hover img { transform: scale(1.06); }