/* ============================================================
   贞远建筑 · 乡居焕新 — 公共样式
   包含：重置、变量、导航、页脚、悬浮按钮、公共组件
   ============================================================ */

/* ── 重置 ── */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

/* ── 设计变量 ── */
:root{
  --gold:#A07840;--gold-l:#C9A96E;--gold-bg:#F5EFE6;
  --primary:#8B7355;--primary-l:#A68B6A;--primary-d:#6B5A45;
  --olive:#3A6B35;--olive-bg:#EEF5EC;
  --warm:#F5F0E8;--warm-bg:#EDE8DF;--cream:#F8F4EE;
  --black:#111111;--gray-900:#1f1f1f;--gray-800:#2a2a2a;
  --gray-600:#6b6b6b;--gray-400:#999999;--gray-200:#e5e5e5;
  --gray-100:#f2f2f2;
  --white:#ffffff;
  --radius:8px;--radius-lg:16px;
  --shadow-sm:0 2px 8px rgba(0,0,0,.06);--shadow:0 8px 32px rgba(0,0,0,.08);
  --shadow-lg:0 16px 48px rgba(0,0,0,.12);--shadow-gold:0 4px 20px rgba(160,120,64,.3);
  --shadow-olive:0 4px 20px rgba(58,107,53,.3);
}

html{scroll-behavior:smooth}
body{font-family:'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;color:var(--gray-900);background:var(--white);-webkit-font-smoothing:antialiased;line-height:1.6;overflow-x:hidden}

/* ── 滚动进度条 ── */
.scroll-progress{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--gold),var(--gold-l));z-index:300;width:0;transition:width .1s linear;border-radius:0 2px 2px 0}

/* ── 导航 ── */
nav{position:fixed;top:0;width:100%;z-index:100;transition:background .3s;padding:0 32px}
nav.scrolled{background:rgba(17,17,17,.92);backdrop-filter:blur(16px)}
.nav-inner{max-width:1280px;margin:0 auto;height:72px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff}
.logo-icon{width:34px;height:34px;border:2px solid var(--gold-l);border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:15px;color:var(--gold-l)}
.logo-text{font-size:17px;font-weight:600;letter-spacing:1px}
.nav-links{display:flex;gap:36px;list-style:none}
.nav-links a{text-decoration:none;color:rgba(255,255,255,.7);font-size:14px;font-weight:500;transition:color .2s;letter-spacing:.5px}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-cta{background:var(--olive);color:#fff;border:none;padding:10px 24px;border-radius:var(--radius);font-size:13px;font-weight:600;cursor:pointer;text-decoration:none;transition:all .2s;letter-spacing:.5px}
.nav-cta:hover{background:#2D5428;transform:translateY(-1px)}
.nav-mobile-btn{display:none;background:none;border:none;color:#fff;font-size:24px;cursor:pointer;padding:4px;line-height:1}

/* 移动端菜单 */
.nav-mobile-overlay{position:fixed;inset:0;z-index:99;background:rgba(0,0,0,.5);opacity:0;visibility:hidden;transition:all .3s}
.nav-mobile-overlay.open{opacity:1;visibility:visible}
.nav-mobile-menu{position:fixed;top:0;right:0;width:260px;height:100vh;z-index:101;background:var(--black);padding:100px 32px 32px;transform:translateX(100%);transition:transform .3s ease;display:flex;flex-direction:column;gap:8px}
.nav-mobile-menu.open{transform:translateX(0)}
.nav-mobile-menu a{color:rgba(255,255,255,.7);text-decoration:none;font-size:16px;font-weight:400;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.06);transition:color .2s;letter-spacing:.5px}
.nav-mobile-menu a:hover,.nav-mobile-menu a.active{color:var(--gold-l)}
.nav-mobile-menu .mobile-cta{margin-top:12px;background:var(--olive);color:#fff;border:none;padding:14px;border-radius:var(--radius);font-size:15px;font-weight:600;text-align:center;text-decoration:none;display:block}
.nav-mobile-menu .mobile-cta:hover{background:#2D5428}
.nav-mobile-close{position:absolute;top:22px;right:20px;background:none;border:none;color:#fff;font-size:22px;cursor:pointer}

/* ── 页脚 ── */
footer{background:var(--black);color:rgba(255,255,255,.4);padding:80px 32px 32px}
.footer-inner{max-width:1280px;margin:0 auto}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:56px}
.footer-brand{display:flex;flex-direction:column;gap:16px}
.footer-logo{font-size:20px;font-weight:600;color:#fff;letter-spacing:1px}
.footer-desc{font-size:13px;line-height:1.8;font-weight:300}
.footer-contact{font-size:13px;color:rgba(255,255,255,.3);margin-top:8px}
.footer-col h4{font-size:13px;font-weight:600;color:#fff;margin-bottom:20px;letter-spacing:1px}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.footer-col ul a{font-size:13px;color:rgba(255,255,255,.4);text-decoration:none;transition:color .2s;font-weight:300}
.footer-col ul a:hover{color:var(--gold-l)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding-top:24px;display:flex;justify-content:space-between;align-items:center;font-size:12px;font-weight:300}
.footer-icp a{color:rgba(255,255,255,.2);text-decoration:none}

/* ── 悬浮按钮 ── */
.float-btns{position:fixed;right:28px;bottom:40px;display:flex;flex-direction:column;gap:10px;z-index:200;align-items:flex-end}
.wx-wrap{position:relative;display:flex;flex-direction:column;align-items:flex-end}
.qr-popup{display:none;position:absolute;bottom:56px;right:0;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:12px;text-align:center;z-index:210;min-width:150px}
.qr-popup::after{content:'';position:absolute;bottom:-8px;right:20px;width:0;height:0;border-left:8px solid transparent;border-right:8px solid transparent;border-top:8px solid #fff}
.qr-popup img{width:140px;height:140px;display:block;margin:0 auto 8px;border-radius:4px}
.qr-popup p{font-size:12px;color:var(--gray-600);margin:0}
.float-btns.show-qr .qr-popup,
.wx-wrap:hover .qr-popup{display:block}
.float-btn{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;cursor:pointer;box-shadow:0 4px 16px rgba(0,0,0,.15);border:none;transition:all .2s;text-decoration:none}
.float-btn:hover{transform:scale(1.08)}
.float-btn.wx{background:#07c160;color:#fff;position:relative}
.float-btn.wx::after{content:'';position:absolute;inset:-3px;border-radius:50%;border:2px solid #07c160;animation:wxPulse 2s ease-in-out infinite}
@keyframes wxPulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.3);opacity:0}}
.float-btn.phone{background:var(--primary);color:#fff}
.float-btn.top{background:rgba(17,17,17,.7);backdrop-filter:blur(8px);color:#fff;font-size:14px}

/* ── 滚动入场动画 ── */
.fade-up{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* ── 区块通用样式 ── */
section{padding:100px 32px}
.section-inner{max-width:1280px;margin:0 auto}
.section-tag{font-size:11px;font-weight:600;color:var(--gray-400);letter-spacing:3px;margin-bottom:12px;text-transform:uppercase}
.section-title{font-size:clamp(28px,2.8vw,42px);font-weight:700;color:var(--gray-900);line-height:1.2;margin-bottom:12px}
.section-sub{font-size:16px;color:var(--gray-600);max-width:520px;line-height:1.7;font-weight:300}
.section-header{margin-bottom:56px;display:flex;justify-content:space-between;align-items:flex-end;gap:32px;flex-wrap:wrap}
.section-header.center{text-align:center;justify-content:center}
.section-header.center .section-sub{margin:0 auto}

/* ── 公共按钮 ── */
.btn-primary{display:inline-flex;align-items:center;gap:10px;background:var(--gold);color:#fff;padding:16px 36px;border-radius:var(--radius);font-size:15px;font-weight:600;text-decoration:none;transition:all .3s;letter-spacing:.5px}
.btn-primary:hover{background:var(--gold-l);transform:translateY(-2px);box-shadow:var(--shadow-gold)}
.btn-outline-light{display:inline-flex;align-items:center;gap:8px;border:1.5px solid rgba(255,255,255,.35);color:#fff;padding:15px 32px;border-radius:var(--radius);font-size:14px;font-weight:500;text-decoration:none;transition:all .2s;letter-spacing:.5px}
.btn-outline-light:hover{border-color:rgba(255,255,255,.7);background:rgba(255,255,255,.08)}

/* ── 标签 ── */
.tag{font-size:11px;padding:4px 10px;border-radius:4px;background:var(--warm);color:var(--gray-600);font-weight:500}
.tag.gold{background:var(--gold-bg);color:var(--gold)}

/* ════════════════════════════════════════════════════════════
   改造前后对比滑动器 (Before/After Slider)
   ════════════════════════════════════════════════════════════ */
.ba-slider{position:relative;width:100%;overflow:hidden;cursor:ew-resize;user-select:none;-webkit-user-select:none;aspect-ratio:4/3;background:var(--cream)}
.ba-slider img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;display:block;pointer-events:none}
.ba-after-clip{position:absolute;top:0;left:0;width:50%;height:100%;overflow:hidden;z-index:2}
.ba-after-clip img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.ba-divider{position:absolute;top:0;bottom:0;left:50%;width:2px;background:rgba(255,255,255,.9);z-index:3;pointer-events:none;box-shadow:0 0 8px rgba(0,0,0,.3);transform:translateX(-50%)}
.ba-handle{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:4;pointer-events:none;width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.95);box-shadow:0 2px 12px rgba(0,0,0,.25);display:flex;align-items:center;justify-content:center;gap:2px}
.ba-handle::before,.ba-handle::after{content:'';display:block;width:0;height:0;border-top:6px solid transparent;border-bottom:6px solid transparent}
.ba-handle::before{border-right:6px solid var(--gray-600)}
.ba-handle::after{border-left:6px solid var(--gray-600)}
.ba-labels{position:absolute;top:16px;z-index:5;display:flex;gap:0;pointer-events:none;width:100%;justify-content:space-between;padding:0 20px}
.ba-label{padding:4px 12px;border-radius:3px;font-size:11px;font-weight:600;letter-spacing:.5px;backdrop-filter:blur(4px)}
.ba-label.before{background:rgba(17,17,17,.7);color:var(--gold-l)}
.ba-label.after{background:rgba(17,17,17,.7);color:#fff}

/* ── 案例卡片内的滑动器 ── */
.case-card .ba-slider{aspect-ratio:4/3}
.case-card .ba-handle{width:36px;height:36px}
.case-card .ba-handle::before,.case-card .ba-handle::after{border-top-width:5px;border-bottom-width:5px}
.case-card .ba-handle::before{border-right-width:5px}
.case-card .ba-handle::after{border-left-width:5px}
.case-card .ba-labels{padding:0 12px;top:12px}
.case-card .ba-label{font-size:10px;padding:3px 8px}

/* ════════════════════════════════════════════════════════════
   骨架屏 (Skeleton Loading)
   ════════════════════════════════════════════════════════════ */
.skeleton-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.skeleton-card{border-radius:var(--radius-lg);overflow:hidden;background:var(--white);box-shadow:var(--shadow-sm)}
.skeleton-img{aspect-ratio:4/3;background:linear-gradient(90deg,var(--gray-100) 25%,var(--gray-200) 50%,var(--gray-100) 75%);background-size:200% 100%;animation:shimmer 1.5s ease-in-out infinite}
.skeleton-body{padding:20px}
.skeleton-line{height:14px;border-radius:4px;background:linear-gradient(90deg,var(--gray-100) 25%,var(--gray-200) 50%,var(--gray-100) 75%);background-size:200% 100%;animation:shimmer 1.5s ease-in-out infinite;margin-bottom:10px}
.skeleton-line:first-child{width:75%;height:18px;margin-bottom:12px}
.skeleton-line:nth-child(2){width:60%}
.skeleton-line:nth-child(3){width:90%;height:10px}
.skeleton-line:nth-child(4){width:40%;height:20px;margin-top:14px}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ── 视差滚动 ── */
.parallax-bg{will-change:transform}

/* ── 数字跳动 ── */
.count-up{display:inline-block;font-variant-numeric:tabular-nums}

/* ── FAQ ── */
.faq-grid{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:8px}
.faq-item{border:1px solid var(--gray-200);border-radius:var(--radius);overflow:hidden;background:var(--white);cursor:pointer}
.faq-q{padding:20px 24px;font-size:15px;font-weight:500;display:flex;justify-content:space-between;align-items:center;transition:background .2s}
.faq-q:hover{background:var(--warm)}
.faq-arrow{font-size:14px;color:var(--gray-400);transition:transform .3s;flex-shrink:0}
.faq-item.open .faq-arrow{transform:rotate(180deg);color:var(--gold)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .3s;font-size:14px;color:var(--gray-600);line-height:1.8}
.faq-item.open .faq-a{padding:0 24px 20px;max-height:300px}

/* ── 响应式 ── */
@media(max-width:1024px){
  .footer-top{grid-template-columns:1fr 1fr;gap:32px}
  .skeleton-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  nav{padding:0 20px}
  .nav-links,.nav-cta{display:none}
  .nav-mobile-btn{display:block}
  section{padding:64px 20px}
  .footer-top{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:8px;text-align:center}
  .skeleton-grid{grid-template-columns:1fr}
  .float-btns{right:16px;bottom:32px}
}