/* ========================================
   糖心vlog - 原创样式表
   品牌色: 赤红#E63946 深海蓝#1D3557 金色#FFD700
   辅助色: 浅蓝#A8DADC 米白#F1FAEE 深灰#2B2D42
   ======================================== */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#2B2D42;background:#0a0e1a;line-height:1.7;overflow-x:hidden}
a{text-decoration:none;color:inherit;transition:color .3s}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* --- Header / Nav --- */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(10,14,26,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,215,0,.15);transition:background .3s}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:42px;width:auto}
.logo-wrap span{font-size:1.3rem;font-weight:700;color:#FFD700;letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{color:#A8DADC;font-size:.9rem;padding:8px 14px;border-radius:6px;transition:all .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#FFD700;background:rgba(255,215,0,.1)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:#FFD700;border-radius:2px;transition:all .3s}

/* --- Search Bar --- */
.search-bar{display:flex;align-items:center;margin-left:12px}
.search-bar input{background:rgba(168,218,220,.12);border:1px solid rgba(168,218,220,.25);color:#F1FAEE;padding:6px 14px;border-radius:20px 0 0 20px;font-size:.85rem;width:160px;outline:none;transition:all .3s}
.search-bar input:focus{border-color:#FFD700;width:200px}
.search-bar input::placeholder{color:rgba(168,218,220,.5)}
.search-bar button{background:linear-gradient(135deg,#E63946,#c62828);color:#fff;border:none;padding:6px 14px;border-radius:0 20px 20px 0;cursor:pointer;font-size:.85rem;transition:background .3s}
.search-bar button:hover{background:linear-gradient(135deg,#ff5252,#E63946)}

/* --- Hero Banner --- */
.hero-banner{position:relative;min-height:520px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:68px}
.hero-banner .bg-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.55)}
.hero-banner .overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,14,26,.3) 0%,rgba(10,14,26,.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;max-width:800px;padding:40px 20px}
.hero-content h1{font-size:2.8rem;color:#FFD700;margin-bottom:16px;text-shadow:0 2px 20px rgba(255,215,0,.3);line-height:1.3}
.hero-content h1 em{font-style:normal;color:#E63946}
.hero-content p{font-size:1.1rem;color:#A8DADC;margin-bottom:28px;line-height:1.8}
.hero-content .btn-group{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* --- Buttons --- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:8px;font-size:.95rem;font-weight:600;cursor:pointer;border:none;transition:all .3s}
.btn-primary{background:linear-gradient(135deg,#E63946,#c62828);color:#fff;box-shadow:0 4px 20px rgba(230,57,70,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 28px rgba(230,57,70,.5)}
.btn-secondary{background:transparent;color:#FFD700;border:2px solid #FFD700}
.btn-secondary:hover{background:rgba(255,215,0,.1);transform:translateY(-2px)}

/* --- Section Common --- */
.section{padding:70px 0}
.section-dark{background:#0d1220}
.section-light{background:#111827}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:2rem;color:#FFD700;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';position:absolute;bottom:-8px;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#E63946,#FFD700);border-radius:2px}
.section-title p{color:#A8DADC;font-size:1rem;margin-top:16px}

/* --- Video Card Grid --- */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.video-card{background:#1a1f35;border-radius:12px;overflow:hidden;transition:all .4s;border:1px solid rgba(168,218,220,.08);position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(230,57,70,.2);border-color:rgba(255,215,0,.2)}
.video-card .thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-card .thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .thumb img{transform:scale(1.05)}
.video-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(230,57,70,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:all .3s;cursor:pointer}
.video-card:hover .play-btn{opacity:1}
.video-card .play-btn::after{content:'';border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}
.video-card .card-body{padding:16px 18px}
.video-card .card-body h3{font-size:1.05rem;color:#F1FAEE;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-body .meta{display:flex;gap:14px;color:#A8DADC;font-size:.8rem}
.video-card .card-body .meta span{display:flex;align-items:center;gap:4px}
.video-card .tag{position:absolute;top:12px;left:12px;background:rgba(230,57,70,.9);color:#fff;padding:3px 10px;border-radius:4px;font-size:.75rem;font-weight:600}

/* --- Expert Cards --- */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:28px}
.expert-card{background:#1a1f35;border-radius:14px;padding:28px 22px;text-align:center;border:1px solid rgba(168,218,220,.08);transition:all .4s}
.expert-card:hover{transform:translateY(-6px);border-color:rgba(255,215,0,.25);box-shadow:0 8px 32px rgba(255,215,0,.1)}
.expert-card .avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid #FFD700;box-shadow:0 0 20px rgba(255,215,0,.2)}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{color:#FFD700;font-size:1.1rem;margin-bottom:4px}
.expert-card .role{color:#E63946;font-size:.85rem;margin-bottom:10px}
.expert-card p{color:#A8DADC;font-size:.85rem;line-height:1.6;margin-bottom:14px}
.expert-card .social-links{display:flex;gap:10px;justify-content:center}
.expert-card .social-links a{width:32px;height:32px;border-radius:50%;background:rgba(168,218,220,.1);display:flex;align-items:center;justify-content:center;color:#A8DADC;font-size:.8rem;transition:all .3s}
.expert-card .social-links a:hover{background:#E63946;color:#fff}

/* --- Module Grid (Services) --- */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.module-card{background:linear-gradient(145deg,#1a1f35,#151929);border-radius:12px;padding:30px 24px;border:1px solid rgba(168,218,220,.06);transition:all .4s;position:relative;overflow:hidden}
.module-card::before{content:'';position:absolute;top:0;left:0;width:100%;height:3px;background:linear-gradient(90deg,#E63946,#FFD700);transform:scaleX(0);transition:transform .4s;transform-origin:left}
.module-card:hover::before{transform:scaleX(1)}
.module-card:hover{transform:translateY(-4px);border-color:rgba(255,215,0,.15)}
.module-card .icon{width:52px;height:52px;border-radius:12px;background:linear-gradient(135deg,rgba(230,57,70,.15),rgba(255,215,0,.1));display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:16px;color:#FFD700}
.module-card h4{color:#F1FAEE;font-size:1.05rem;margin-bottom:8px}
.module-card p{color:#A8DADC;font-size:.88rem;line-height:1.6}

/* --- FAQ Section --- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#1a1f35;border-radius:10px;margin-bottom:12px;border:1px solid rgba(168,218,220,.06);overflow:hidden}
.faq-item .faq-q{padding:18px 22px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:#F1FAEE;font-size:.95rem;font-weight:600;transition:all .3s}
.faq-item .faq-q:hover{color:#FFD700}
.faq-item .faq-q .arrow{color:#FFD700;font-size:1.2rem;transition:transform .3s}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-item .faq-a{padding:0 22px;max-height:0;overflow:hidden;transition:all .4s;color:#A8DADC;font-size:.9rem;line-height:1.7}
.faq-item.open .faq-a{padding:0 22px 18px;max-height:500px}

/* --- Reviews --- */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{background:#1a1f35;border-radius:12px;padding:24px;border:1px solid rgba(168,218,220,.06);transition:all .3s}
.review-card:hover{border-color:rgba(255,215,0,.2)}
.review-card .stars{color:#FFD700;font-size:.9rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{color:#A8DADC;font-size:.9rem;line-height:1.7;margin-bottom:14px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .r-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#E63946,#FFD700);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.85rem;font-weight:700}
.review-card .reviewer .r-info{font-size:.82rem;color:#F1FAEE}
.review-card .reviewer .r-info small{color:#A8DADC;display:block}

/* --- Contact Section --- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:28px}
.contact-card{background:#1a1f35;border-radius:12px;padding:28px;text-align:center;border:1px solid rgba(168,218,220,.06);transition:all .3s}
.contact-card:hover{border-color:rgba(255,215,0,.15)}
.contact-card .c-icon{font-size:2rem;color:#FFD700;margin-bottom:12px}
.contact-card h4{color:#F1FAEE;margin-bottom:8px;font-size:1rem}
.contact-card p{color:#A8DADC;font-size:.88rem;line-height:1.6}
.contact-card img{max-width:140px;margin:12px auto 0;border-radius:8px}

/* --- Share Buttons --- */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-bar a{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:.85rem;color:#fff;transition:all .3s}
.share-bar a:hover{transform:translateY(-2px)}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* --- Footer --- */
.site-footer{background:#080c16;border-top:1px solid rgba(255,215,0,.1);padding:40px 0 20px}
.footer-top{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h5{color:#FFD700;font-size:.95rem;margin-bottom:14px;position:relative;padding-bottom:8px}
.footer-col h5::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#E63946}
.footer-col p,.footer-col a{color:#A8DADC;font-size:.85rem;line-height:1.8}
.footer-col a:hover{color:#FFD700}
.footer-col .footer-logo{height:36px;margin-bottom:10px}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(168,218,220,.08);color:#A8DADC;font-size:.82rem}

/* --- Breadcrumb --- */
.breadcrumb{padding:14px 0;font-size:.85rem;color:#A8DADC}
.breadcrumb a{color:#FFD700}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb span{margin:0 6px;color:#A8DADC}

/* --- Inner Page Banner --- */
.inner-banner{background:linear-gradient(135deg,#1D3557,#0a0e1a);padding:100px 0 40px;text-align:center}
.inner-banner h1{color:#FFD700;font-size:2.2rem;margin-bottom:10px}
.inner-banner p{color:#A8DADC;font-size:1rem}

/* --- Content Area --- */
.content-area{padding:40px 0}
.content-area h2{color:#FFD700;font-size:1.6rem;margin:28px 0 14px}
.content-area h3{color:#F1FAEE;font-size:1.25rem;margin:20px 0 10px}
.content-area p{color:#A8DADC;font-size:.92rem;line-height:1.8;margin-bottom:14px}
.content-area ul{margin:10px 0 14px 20px}
.content-area ul li{color:#A8DADC;font-size:.9rem;line-height:1.8;position:relative;padding-left:16px}
.content-area ul li::before{content:'';position:absolute;left:0;top:10px;width:6px;height:6px;border-radius:50%;background:#E63946}

/* --- How-To Guide --- */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px;margin-top:24px}
.howto-step{background:#1a1f35;border-radius:12px;padding:24px;text-align:center;border:1px solid rgba(168,218,220,.06);position:relative}
.howto-step .step-num{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#E63946,#FFD700);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.1rem;margin:0 auto 14px}
.howto-step h4{color:#F1FAEE;font-size:1rem;margin-bottom:8px}
.howto-step p{color:#A8DADC;font-size:.85rem;line-height:1.6}

/* --- Partner Logos --- */
.partner-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;align-items:center;padding:20px 0}
.partner-wall .partner-item{background:#1a1f35;border-radius:10px;padding:16px 24px;border:1px solid rgba(168,218,220,.06);transition:all .3s;min-width:140px;text-align:center;color:#A8DADC;font-size:.9rem}
.partner-wall .partner-item:hover{border-color:#FFD700;color:#FFD700}

/* --- Stats Bar --- */
.stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:30px 0}
.stat-item{text-align:center}
.stat-item .num{font-size:2.2rem;font-weight:700;color:#FFD700;display:block}
.stat-item .label{color:#A8DADC;font-size:.85rem;margin-top:4px}

/* --- Responsive --- */
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:68px;left:0;width:100%;background:rgba(10,14,26,.98);flex-direction:column;padding:20px;gap:4px;border-top:1px solid rgba(255,215,0,.1)}
  .main-nav.open{display:flex}
  .nav-toggle{display:flex}
  .search-bar{display:none}
  .hero-content h1{font-size:1.8rem}
  .hero-banner{min-height:400px}
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr 1fr}
  .stats-bar{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr}
  .module-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .expert-grid{grid-template-columns:1fr}
  .stats-bar{grid-template-columns:1fr 1fr}
  .hero-content h1{font-size:1.5rem}
}

/* --- Lazy Load --- */
img[data-src]{opacity:0;transition:opacity .5s}
img.loaded{opacity:1}

/* --- Animation --- */
.fade-in{opacity:0;transform:translateY(20px);transition:all .6s}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* --- Breadcrumb Bar --- */
.breadcrumb-bar{background:#0d1220;padding:0;margin-top:68px;border-bottom:1px solid rgba(168,218,220,.06)}
.breadcrumb-bar .breadcrumb{padding:10px 0;font-size:.82rem}

/* --- Video Card with HTML5 Video --- */
.video-card .thumb video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .thumb video{transform:scale(1.05)}
.video-card .video-desc{color:#A8DADC;font-size:.82rem;line-height:1.5;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .meta .author{color:#FFD700;font-weight:600}

/* --- News Grid --- */
.news-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:24px}
.news-card{background:#1a1f35;border-radius:12px;overflow:hidden;border:1px solid rgba(168,218,220,.08);transition:all .4s}
.news-card:hover{transform:translateY(-4px);box-shadow:0 8px 32px rgba(230,57,70,.15);border-color:rgba(255,215,0,.2)}
.news-card .news-img{height:180px;overflow:hidden}
.news-card .news-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.news-card:hover .news-img img{transform:scale(1.05)}
.news-card .news-body{padding:18px}
.news-card .news-date{color:#E63946;font-size:.8rem;font-weight:600}
.news-card .news-body h3{margin:8px 0;font-size:1rem;color:#F1FAEE;line-height:1.4}
.news-card .news-body h3 a{color:#F1FAEE;transition:color .3s}
.news-card .news-body h3 a:hover{color:#FFD700}
.news-card .news-body p{color:#A8DADC;font-size:.85rem;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-card .news-author{color:#A8DADC;font-size:.78rem;display:block;margin-top:10px}

/* --- Expert Credentials --- */
.expert-credentials{display:flex;flex-direction:column;gap:4px;margin:10px 0;font-size:.78rem;color:#A8DADC;text-align:left;padding:8px 12px;background:rgba(168,218,220,.05);border-radius:6px}
.expert-credentials span{display:block}

/* --- Footer Trust --- */
.footer-trust{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;padding:16px 0;border-top:1px solid rgba(168,218,220,.06);border-bottom:1px solid rgba(168,218,220,.06);margin-bottom:16px}
.footer-trust span{color:#A8DADC;font-size:.75rem;opacity:.7}

/* --- 404 Page --- */
.error-page{min-height:60vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 20px;margin-top:68px}
.error-page h1{font-size:6rem;color:#E63946;margin-bottom:10px}
.error-page h2{color:#FFD700;font-size:1.6rem;margin-bottom:16px}
.error-page p{color:#A8DADC;font-size:1rem;margin-bottom:28px}

/* --- Responsive additions --- */
@media(max-width:768px){
  .news-grid{grid-template-columns:1fr}
  .breadcrumb-bar{margin-top:68px}
}