:root {--primary-dark:#0a0a0a;--primary-charcoal:#1a1a1a;--secondary-dark:#2d2d2d;--gold-primary:#c9a962;--gold-light:#e8d5a3;--gold-dark:#a08440;--cream:#f5f3f0;--warm-white:#faf9f7;--text-gray:#666666;--text-light:#999999;--ocean-blue:#0066cc;--ocean-teal:#00b4d8;--font-primary:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--transition-smooth:all 0.4s cubic-bezier(0.4,0,0.2,1);--shadow-elegant:0 20px 60px rgba(0,0,0,0.3);--shadow-soft:0 10px 40px rgba(0,0,0,0.1);}
* {margin:0;padding:0;box-sizing:border-box;}
html {scroll-behavior:smooth;}
body {font-family:var(--font-primary);background:var(--warm-white);color:var(--primary-charcoal);line-height:1.6;overflow-x:hidden;}

/* Hero */
.case-hero {position:relative;height:100vh;min-height:700px;overflow:hidden;display:flex;align-items:center;justify-content:center;}
.case-hero-bg {position:absolute;top:0;left:0;width:100%;height:100%;background-size:cover;background-position:center;}
.case-hero-overlay {position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(135deg,rgba(10,10,10,0.9) 0%,rgba(10,10,10,0.5) 50%,rgba(0,102,204,0.2) 100%);}
.case-hero-content {position:relative;z-index:2;max-width:1400px;margin:0 auto;padding:0 40px;text-align:center;}
.case-tag {display:inline-block;color:var(--ocean-teal);font-size:0.85rem;letter-spacing:3px;text-transform:uppercase;margin-bottom:20px;border:1px solid rgba(0,180,216,0.4);padding:8px 24px;border-radius:30px;}
.case-title {font-size:4rem;font-weight:700;color:white;line-height:1.2;margin-bottom:20px;}
.case-title span {color:var(--gold-primary);font-weight:300;}
.case-subtitle {font-size:1.4rem;color:rgba(255,255,255,0.8);margin-bottom:40px;}
.case-meta {display:flex;justify-content:center;gap:60px;margin-bottom:50px;flex-wrap:wrap;}
.case-meta-item {text-align:center;}
.case-meta-num {font-size:2.5rem;font-weight:700;color:var(--gold-primary);display:block;line-height:1;}
.case-meta-label {font-size:0.85rem;color:rgba(255,255,255,0.6);margin-top:8px;letter-spacing:1px;}
.case-hero-btns {display:flex;gap:20px;justify-content:center;flex-wrap:wrap;}
.btn-outline {background:transparent;color:white;padding:14px 32px;border:1px solid rgba(255,255,255,0.3);border-radius:4px;text-decoration:none;font-weight:500;transition:var(--transition-smooth);}
.btn-outline:hover {background:white;color:var(--primary-dark);}
/* 展会介绍 */
.expo-intro {padding:30px 0;background:var(--cream);position:relative;overflow:hidden;}
.expo-intro::before {content:'';position:absolute;top:-200px;right:-200px;width:600px;height:600px;background:radial-gradient(circle,rgba(0,102,204,0.08) 0%,transparent 70%);}
.container {max-width:1400px;margin:0 auto;padding:0 40px;position:relative;z-index:1;}
.section-tag {color:var(--gold-primary);font-size:0.85rem;letter-spacing:3px;text-transform:uppercase;margin-bottom:16px;display:block;}
.section-title {font-size:2.8rem;font-weight:700;color:var(--primary-dark);margin-bottom:20px;line-height:1.3;}
.section-desc {font-size:1.1rem;color:var(--text-gray);max-width:700px;margin:0 auto;line-height:1.8;}
.section-header {text-align:center;margin-bottom:80px;}
.expo-grid {display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center;}
.expo-info h3 {font-size:1.8rem;color:var(--primary-dark);margin-bottom:20px;}
.expo-info p {color:var(--text-gray);line-height:2;margin-bottom:20px;font-size:1.05rem;}
.expo-highlights {display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:40px;}
.expo-highlight {background:white;padding:24px;border-radius:4px;border-left:3px solid var(--ocean-blue);transition:var(--transition-smooth);}
.expo-highlight:hover {transform:translateX(8px);box-shadow:var(--shadow-soft);}
.expo-highlight h4 {font-size:1.1rem;color:var(--primary-dark);margin-bottom:8px;}
.expo-highlight p {font-size:0.9rem;color:var(--text-gray);margin:0;line-height:1.6;}
.expo-visual {position:relative;}
.expo-visual img {width:100%;border-radius:4px;box-shadow:var(--shadow-elegant);}
.expo-badge {position:absolute;bottom:-30px;left:-30px;background:var(--ocean-blue);color:white;padding:30px 40px;border-radius:4px;text-align:center;box-shadow:0 20px 60px rgba(0,102,204,0.3);}
.expo-badge-num {font-size:3rem;font-weight:700;display:block;line-height:1;}
.expo-badge-text {font-size:0.85rem;letter-spacing:2px;text-transform:uppercase;margin-top:4px;}
/* 方案亮点 */
.solution-section {padding:30px 0;background:var(--primary-dark);color:white;position:relative;overflow:hidden;}
.solution-section::before {content:'';position:absolute;top:0;left:0;right:0;bottom:0;background: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='%23c9a962' 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");}
.solution-section .section-title {color:white;}
.solution-section .section-desc {color:rgba(255,255,255,0.7);}
.solution-grid {display:grid;grid-template-columns:repeat(4,1fr);gap:30px;margin-top:60px;}
.solution-card {background:rgba(255,255,255,0.03);border:1px solid rgba(255,255,255,0.08);padding:40px 30px;border-radius:4px;text-align:center;transition:var(--transition-smooth);position:relative;overflow:hidden;}
.solution-card::before {content:'';position:absolute;top:0;left:0;width:100%;height:3px;background:linear-gradient(90deg,var(--ocean-teal),var(--gold-primary));transform:scaleX(0);transition:transform 0.4s ease;}
.solution-card:hover {transform:translateY(-10px);background:rgba(255,255,255,0.06);border-color:rgba(255,255,255,0.15);}
.solution-card:hover::before {transform:scaleX(1);}
.solution-icon {width:70px;height:70px;background:linear-gradient(135deg,rgba(0,180,216,0.2),rgba(0,102,204,0.2));border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 24px;font-size:1.8rem;}
.solution-icon svg {width:32px;height:32px;color:var(--ocean-teal);}
.solution-card h3 {font-size:1.3rem;margin-bottom:16px;color:white;}
.solution-card p {color:rgba(255,255,255,0.7);font-size:0.95rem;line-height:1.8;}
/* 平面规划 */
.plan-section {padding:30px 0;background:white;}
.plan-showcase {display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:60px;}
.plan-card {background:var(--cream);border-radius:4px;overflow:hidden;transition:var(--transition-smooth);cursor:pointer;}
.plan-card:hover {transform:translateY(-8px);box-shadow:var(--shadow-elegant);}
.plan-card img {width:100%;height:350px;object-fit:cover;display:block;}
.plan-card-info {padding:30px;}
.plan-card-info h4 {font-size:1.3rem;color:var(--primary-dark);margin-bottom:10px;}
.plan-card-info p {color:var(--text-gray);font-size:0.95rem;line-height:1.7;}
/* 效果图展示 */
.gallery-section {padding:30px 0;background:var(--cream);}
.gallery-grid {display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:60px;}
.gallery-item {position:relative;overflow:hidden;border-radius:4px;cursor:pointer;aspect-ratio:4/3;}
.gallery-item img {width:100%;height:100%;object-fit:cover;transition:transform 0.8s ease;}
.gallery-item:hover img {transform:scale(1.1);}
.gallery-overlay {position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(to top,rgba(10,10,10,0.8) 0%,transparent 60%);display:flex;flex-direction:column;justify-content:flex-end;padding:30px;opacity:0;transition:var(--transition-smooth);}
.gallery-item:hover .gallery-overlay {opacity:1;}
.gallery-overlay h4 {color:white;font-size:1.1rem;margin-bottom:8px;}
.gallery-overlay p {color:rgba(255,255,255,0.7);font-size:0.85rem;}
.gallery-zoom {position:absolute;top:20px;right:20px;width:50px;height:50px;background:rgba(255,255,255,0.15);backdrop-filter:blur(10px);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transform:scale(0.8);transition:var(--transition-smooth);}
.gallery-item:hover .gallery-zoom {opacity:1;transform:scale(1);}
.gallery-zoom svg {width:20px;height:20px;color:white;}
.gallery-item.wide {grid-column:span 2;grid-row:span 2;}
.gallery-item.tall {grid-row:span 2;aspect-ratio:auto;}

/* 大图弹窗 */
.lightbox {position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.95);z-index:9999;display:none;align-items:center;justify-content:center;padding:40px;}
.lightbox.active {display:flex;}
.lightbox-img {max-width:90%;max-height:90%;object-fit:contain;border-radius:4px;box-shadow:0 30px 80px rgba(0,0,0,0.5);}
.lightbox-close {position:absolute;top:30px;right:40px;width:50px;height:50px;background:rgba(255,255,255,0.1);border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition-smooth);border:none;}
.lightbox-close:hover {background:rgba(255,255,255,0.2);transform:rotate(90deg);}
.lightbox-close svg {width:24px;height:24px;color:white;}
.lightbox-nav {position:absolute;top:50%;transform:translateY(-50%);width:60px;height:60px;background:rgba(255,255,255,0.1);border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition-smooth);border:none;color:white;}
.lightbox-nav:hover {background:var(--gold-primary);color:var(--primary-dark);}
.lightbox-prev {left:40px;}
.lightbox-next {right:40px;}
.lightbox-counter {position:absolute;bottom:40px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,0.7);font-size:0.9rem;letter-spacing:2px;}
/* 公司实力 */
.strength-section {padding:30px 0;background:var(--primary-dark);color:white;position:relative;}
.strength-section::before {content:'';position:absolute;top:-50%;right:-20%;width:800px;height:800px;background:radial-gradient(circle,rgba(201,169,98,0.08) 0%,transparent 70%);}
.strength-section .section-title {color:white;}
.strength-grid {display:grid;grid-template-columns:repeat(2,1fr);gap:60px;align-items:center;position:relative;z-index:1;}
.strength-content h3 {font-size:2rem;color:var(--gold-primary);margin-bottom:30px;}
.strength-content p {color:rgba(255,255,255,0.8);line-height:2;margin-bottom:20px;font-size:1.05rem;}
.strength-list {margin-top:40px;}
.strength-item {display:flex;align-items:flex-start;gap:20px;margin-bottom:30px;padding:24px;background:rgba(255,255,255,0.03);border-radius:4px;border-left:3px solid var(--gold-primary);transition:var(--transition-smooth);}
.strength-item:hover {background:rgba(255,255,255,0.06);transform:translateX(8px);}
.strength-item-icon {width:50px;height:50px;background:linear-gradient(135deg,var(--gold-primary),var(--gold-dark));border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.strength-item-icon svg {width:24px;height:24px;color:var(--primary-dark);}
.strength-item-text h4 {font-size:1.1rem;color:white;margin-bottom:6px;}
.strength-item-text p {color:rgba(255,255,255,0.6);font-size:0.9rem;margin:0;line-height:1.6;}
.strength-stats {display:grid;grid-template-columns:repeat(2,1fr);gap:30px;}
.strength-stat {background:rgba(255,255,255,0.03);border:1px solid rgba(255,255,255,0.08);padding:40px;border-radius:4px;text-align:center;transition:var(--transition-smooth);}
.strength-stat:hover {border-color:var(--gold-primary);transform:translateY(-5px);}
.strength-stat-num {font-size:3rem;font-weight:700;color:var(--gold-primary);display:block;line-height:1;margin-bottom:10px;}
.strength-stat-label {color:rgba(255,255,255,0.7);font-size:0.95rem;letter-spacing:1px;}
.shili { grid-column:span 2;}
/* CTA */
.cta-section {padding:30px 0;background:linear-gradient(135deg,var(--primary-dark) 0%,var(--secondary-dark) 100%);position:relative;overflow:hidden;}
.cta-section::before {content:'';position:absolute;top:0;left:0;right:0;bottom:0;background: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='0.05'%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");}
.cta-content {text-align:center;position:relative;z-index:1;max-width:800px;margin:0 auto;}
.cta-title {font-size:3rem;color:white;margin-bottom:24px;font-weight:700;}
.cta-title span {color:var(--gold-primary);}
.cta-desc {color:rgba(255,255,255,0.9);font-size:1.2rem;margin-bottom:50px;line-height:1.8;}
.cta-phone {font-size:2.5rem;color:var(--gold-primary);text-decoration:none;font-weight:700;letter-spacing:2px;display:block;margin-bottom:10px;}
.cta-phone-label {color:rgba(255,255,255,0.7);font-size:0.9rem;letter-spacing:2px;text-transform:uppercase;}

/* 浮动按钮 */
.float-cta {position:fixed;right:30px;bottom:100px;z-index:999;display:flex;flex-direction:column;gap:16px;}
.float-btn {width:60px;height:60px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:white;text-decoration:none;box-shadow:0 8px 30px rgba(0,0,0,0.3);transition:var(--transition-smooth);position:relative;font-size:1.5rem;}
.float-btn-phone {background:var(--gold-primary);color:var(--primary-dark);}
.float-btn-wechat {background:#07c160;}
.float-btn-top {background:var(--secondary-dark);opacity:0;visibility:hidden;transform:translateY(20px);}
.float-btn-top.visible {opacity:1;visibility:visible;transform:translateY(0);}
.float-btn:hover {transform:scale(1.1) translateY(-5px);}
.float-tooltip {position:absolute;right:75px;background:var(--primary-dark);color:white;padding:10px 20px;border-radius:4px;font-size:0.85rem;white-space:nowrap;opacity:0;visibility:hidden;transition:var(--transition-smooth);box-shadow:0 4px 20px rgba(0,0,0,0.2);}
.float-btn:hover .float-tooltip {opacity:1;visibility:visible;}
/* 滚动动画 */
.reveal {opacity:0;transform:translateY(40px);transition:all 0.8s ease;}
.reveal.active {opacity:1;transform:translateY(0);}
/* 响应式 */
@media (max-width:1200px) {.solution-grid {grid-template-columns:repeat(2,1fr);}
.gallery-grid {grid-template-columns:repeat(2,1fr);}
.gallery-item.wide {grid-column:span 2;}
.gallery-item.tall {grid-row:span 1;aspect-ratio:4/3;}
}
@media (max-width:1024px) {.header-inner {padding:0 20px;}
.nav-menu {position:fixed;top:0;right:-100%;width:80%;max-width:400px;height:100vh;background:var(--primary-dark);flex-direction:column;padding:100px 40px;gap:30px;transition:right 0.4s ease;box-shadow:-10px 0 50px rgba(0,0,0,0.5);}
.nav-menu.active {right:0;}
.mobile-menu-btn {display:flex;}
.mobile-menu-btn.active span:nth-child(1) {transform:rotate(45deg) translate(5px,5px);}
.mobile-menu-btn.active span:nth-child(2) {opacity:0;}
.mobile-menu-btn.active span:nth-child(3) {transform:rotate(-45deg) translate(7px,-6px);}
.case-title {font-size:2.8rem;}
.case-meta {gap:40px;}
.expo-grid {grid-template-columns:1fr;gap:60px;}
.expo-visual {order:-1;}
.expo-badge {left:20px;bottom:-20px;padding:20px 30px;}
.plan-showcase {grid-template-columns:1fr;}
.strength-grid {grid-template-columns:1fr;gap:60px;}
.footer-grid {grid-template-columns:repeat(2,1fr);}
.lightbox-nav {width:45px;height:45px;}
.lightbox-prev {left:15px;}
.lightbox-next {right:15px;}
}
@media (max-width:768px) {.case-hero {min-height:600px;}
.case-title {font-size:2rem;}
.case-subtitle {font-size:1.1rem;}
.case-meta-num {font-size:2rem;}
.case-meta {gap:30px;}
.section-title {font-size:2rem;}
.solution-grid {grid-template-columns:1fr;}
.gallery-grid {grid-template-columns:1fr;}
.gallery-item.wide {grid-column:span 1;}
.strength-stats {grid-template-columns:1fr;}
.expo-highlights {grid-template-columns:1fr;}
.cta-title {font-size:2rem;}
.cta-phone {font-size:1.8rem;}
.footer-grid {grid-template-columns:1fr;gap:40px;}
.footer-bottom {flex-direction:column;gap:15px;text-align:center;}
.float-cta {right:15px;bottom:80px;}
.float-btn {width:50px;height:50px;font-size:1.2rem;}
.container {padding:0 20px;}
.case-hero-content {padding:0 20px;}
.lightbox {padding:20px;}
.lightbox-close {top:15px;right:15px;}
}
@media (max-width:480px) {.case-title {font-size:1.6rem;}
.case-meta {flex-direction:column;gap:20px;}
.expo-badge-num {font-size:2rem;}
.strength-stat-num {font-size:2.5rem;}
.solution-card {padding:30px 20px;}
}