/* =============================================
   高清视频 - 影视传媒视频社区
   原创主题：深宇宙紫 × 玫瑰金
   域名：mo479222.cn
   ============================================= */

/* ── 全局变量 ── */
:root {
  --c-primary:   #7B2FBE;
  --c-primary-d: #5A1E8C;
  --c-accent:    #D4A0C0;
  --c-gold:      #C9956A;
  --c-gold-l:    #E8C4A0;
  --c-bg:        #0D0818;
  --c-bg2:       #130D24;
  --c-bg3:       #1C1535;
  --c-card:      #1A1230;
  --c-border:    rgba(123,47,190,0.25);
  --c-text:      #E8E0F0;
  --c-text2:     #A898C0;
  --c-text3:     #7060A0;
  --c-white:     #FFFFFF;
  --radius:      12px;
  --radius-lg:   20px;
  --shadow:      0 4px 24px rgba(123,47,190,0.18);
  --shadow-lg:   0 8px 48px rgba(123,47,190,0.28);
  --trans:       all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-main:   'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
}

/* ── Reset ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font-main);background:var(--c-bg);color:var(--c-text);line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none;transition:var(--trans)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
button{cursor:pointer;border:none;background:none;font-family:inherit}
input{font-family:inherit}

/* ── 滚动条 ── */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--c-bg2)}
::-webkit-scrollbar-thumb{background:var(--c-primary);border-radius:3px}

/* ── 容器 ── */
.container{max-width:1280px;margin:0 auto;padding:0 20px}
.section{padding:80px 0}
.section-inner{padding:0}

/* ── 标题组 ── */
.section-header{text-align:center;margin-bottom:48px}
.section-tag{display:inline-block;padding:4px 16px;background:rgba(123,47,190,0.15);border:1px solid var(--c-border);border-radius:20px;font-size:13px;color:var(--c-accent);letter-spacing:2px;margin-bottom:12px}
.section-title{font-size:clamp(24px,3vw,38px);font-weight:700;background:linear-gradient(135deg,var(--c-white) 0%,var(--c-accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}
.section-desc{font-size:15px;color:var(--c-text2);max-width:600px;margin:0 auto}

/* ── 按钮 ── */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius);font-size:15px;font-weight:600;transition:var(--trans);cursor:pointer}
.btn-primary{background:linear-gradient(135deg,var(--c-primary) 0%,#9B4FDE 100%);color:var(--c-white);box-shadow:0 4px 20px rgba(123,47,190,0.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 32px rgba(123,47,190,0.55)}
.btn-secondary{background:rgba(123,47,190,0.12);color:var(--c-accent);border:1px solid var(--c-border)}
.btn-secondary:hover{background:rgba(123,47,190,0.25);transform:translateY(-2px)}
.btn-gold{background:linear-gradient(135deg,var(--c-gold) 0%,var(--c-gold-l) 100%);color:#2A1500;font-weight:700}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(201,149,106,0.45)}

/* ── 导航栏 ── */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(13,8,24,0.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--c-border);transition:var(--trans)}
.header.scrolled{background:rgba(13,8,24,0.98);box-shadow:var(--shadow)}
.nav-inner{display:flex;align-items:center;height:68px;gap:0}
.nav-logo{display:flex;align-items:center;gap:10px;flex-shrink:0;margin-right:32px}
.nav-logo-img{width:38px;height:38px;border-radius:50%;object-fit:cover;border:2px solid var(--c-primary)}
.nav-logo-text{font-size:18px;font-weight:700;background:linear-gradient(135deg,var(--c-white),var(--c-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;white-space:nowrap}
.nav-menu{display:flex;align-items:center;gap:4px;flex:1}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;gap:4px;padding:8px 14px;border-radius:8px;font-size:14px;color:var(--c-text2);transition:var(--trans);white-space:nowrap}
.nav-link:hover,.nav-link.active{color:var(--c-white);background:rgba(123,47,190,0.15)}
.nav-link .arrow{font-size:10px;transition:transform 0.3s}
.nav-item:hover .arrow{transform:rotate(180deg)}
.nav-dropdown{position:absolute;top:calc(100% + 8px);left:0;min-width:160px;background:var(--c-bg3);border:1px solid var(--c-border);border-radius:var(--radius);padding:8px;opacity:0;visibility:hidden;transform:translateY(-8px);transition:var(--trans);z-index:100;box-shadow:var(--shadow-lg)}
.nav-item:hover .nav-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.nav-dropdown-item{display:block;padding:9px 14px;border-radius:8px;font-size:13px;color:var(--c-text2);transition:var(--trans)}
.nav-dropdown-item:hover{color:var(--c-white);background:rgba(123,47,190,0.2)}
.nav-actions{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}
.hamburger{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer}
.hamburger-line{width:22px;height:2px;background:var(--c-text);border-radius:2px;transition:var(--trans)}
.mobile-menu{display:none;position:fixed;top:68px;left:0;right:0;background:var(--c-bg2);border-bottom:1px solid var(--c-border);padding:16px;z-index:999;max-height:calc(100vh - 68px);overflow-y:auto}
.mobile-menu.open{display:block}
.mobile-menu .nav-link{padding:12px 16px;border-radius:8px;display:block}

/* ── 搜索框 ── */
.search-bar{padding:12px 20px;background:var(--c-bg2);border-bottom:1px solid var(--c-border)}
.search-bar-inner{display:flex;align-items:center;gap:12px;max-width:600px;margin:0 auto}
.search-input-wrap{flex:1;display:flex;align-items:center;background:var(--c-bg3);border:1px solid var(--c-border);border-radius:24px;padding:0 16px;transition:var(--trans)}
.search-input-wrap:focus-within{border-color:var(--c-primary);box-shadow:0 0 0 3px rgba(123,47,190,0.15)}
.search-icon{color:var(--c-text3);font-size:16px;margin-right:8px}
.search-input{flex:1;background:none;border:none;outline:none;color:var(--c-text);font-size:14px;padding:10px 0}
.search-input::placeholder{color:var(--c-text3)}
.search-btn{padding:10px 20px;background:linear-gradient(135deg,var(--c-primary),#9B4FDE);color:var(--c-white);border-radius:20px;font-size:14px;font-weight:600;transition:var(--trans);flex-shrink:0}
.search-btn:hover{transform:scale(1.04);box-shadow:0 4px 16px rgba(123,47,190,0.4)}
.search-tip{font-size:12px;color:var(--c-text3);text-align:center;padding:4px 0}

/* ── Banner ── */
.banner{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;padding-top:120px}
.banner-bg{position:absolute;inset:0;background-image:url('../images/banner_bg.jpg');background-size:cover;background-position:center;z-index:0}
.banner-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,8,24,0.88) 0%,rgba(91,30,140,0.55) 50%,rgba(13,8,24,0.75) 100%);z-index:1}
.banner-particles{position:absolute;inset:0;z-index:2;pointer-events:none}
.banner-inner{position:relative;z-index:3;display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.banner-content{}
.banner-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;background:rgba(123,47,190,0.2);border:1px solid rgba(123,47,190,0.4);border-radius:20px;font-size:13px;color:var(--c-accent);margin-bottom:20px}
.banner-badge-dot{width:8px;height:8px;background:#4ADE80;border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:0.6;transform:scale(1.3)}}
.banner-title{font-size:clamp(32px,4.5vw,58px);font-weight:800;line-height:1.2;margin-bottom:16px}
.banner-title .hl{background:linear-gradient(135deg,var(--c-accent),var(--c-gold));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.banner-subtitle{font-size:clamp(16px,2vw,22px);color:var(--c-accent);font-weight:600;margin-bottom:16px}
.banner-desc{font-size:15px;color:var(--c-text2);margin-bottom:32px;line-height:1.8;max-width:520px}
.banner-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:40px}
.banner-stats{display:flex;gap:32px;flex-wrap:wrap}
.banner-stat{}
.banner-stat-num{font-size:28px;font-weight:800;background:linear-gradient(135deg,var(--c-white),var(--c-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.banner-stat-label{font-size:13px;color:var(--c-text3)}
.banner-img{position:relative}
.banner-img img{width:100%;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);border:1px solid var(--c-border)}
.banner-img-badge{position:absolute;bottom:-16px;left:-16px;background:var(--c-bg3);border:1px solid var(--c-border);border-radius:var(--radius);padding:12px 20px;display:flex;align-items:center;gap:12px;box-shadow:var(--shadow)}
.banner-img-badge .badge-icon{width:40px;height:40px;background:linear-gradient(135deg,var(--c-primary),#9B4FDE);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px}
.banner-img-badge .badge-text{font-size:13px;color:var(--c-text2)}
.banner-img-badge .badge-num{font-size:18px;font-weight:700;color:var(--c-white)}

/* ── 公告栏 ── */
.notice-bar{background:linear-gradient(90deg,var(--c-primary-d),var(--c-primary));padding:10px 0;overflow:hidden;position:relative}
.notice-inner{display:flex;align-items:center;gap:16px}
.notice-label{background:rgba(255,255,255,0.2);padding:3px 12px;border-radius:12px;font-size:12px;font-weight:600;white-space:nowrap;flex-shrink:0}
.notice-scroll{flex:1;overflow:hidden;white-space:nowrap}
.notice-text{display:inline-block;animation:scroll-left 30s linear infinite;font-size:13px;color:rgba(255,255,255,0.9)}
@keyframes scroll-left{0%{transform:translateX(100%)}100%{transform:translateX(-100%)}}
.notice-close{flex-shrink:0;color:rgba(255,255,255,0.7);font-size:18px;cursor:pointer;padding:0 8px;transition:var(--trans)}
.notice-close:hover{color:var(--c-white)}

/* ── 视频网格 ── */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-grid.cols-4{grid-template-columns:repeat(4,1fr)}
.video-grid.cols-3{grid-template-columns:repeat(3,1fr)}
.video-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);overflow:hidden;transition:var(--trans);cursor:pointer;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(123,47,190,0.5)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--c-bg3)}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s ease}
.video-card:hover .video-thumb img{transform:scale(1.06)}
.video-play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0);transition:var(--trans)}
.video-card:hover .video-play-btn{background:rgba(0,0,0,0.45)}
.play-icon{width:54px;height:54px;background:rgba(123,47,190,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transform:scale(0.7);transition:var(--trans);backdrop-filter:blur(4px);border:2px solid rgba(255,255,255,0.3)}
.play-icon::after{content:'';border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.video-card:hover .play-icon{opacity:1;transform:scale(1)}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.75);color:#fff;font-size:12px;padding:2px 8px;border-radius:4px;backdrop-filter:blur(4px)}
.video-tag{position:absolute;top:8px;left:8px;background:linear-gradient(135deg,var(--c-primary),#9B4FDE);color:#fff;font-size:11px;padding:3px 10px;border-radius:10px;font-weight:600}
.video-info{padding:14px}
.video-title{font-size:14px;font-weight:600;color:var(--c-text);margin-bottom:8px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--c-text3)}
.video-stats{display:flex;gap:12px}
.video-stats span{display:flex;align-items:center;gap:4px}

/* ── 视频模态框 ── */
.video-modal{position:fixed;inset:0;z-index:9999;display:none;align-items:center;justify-content:center}
.video-modal.open{display:flex}
.modal-overlay{position:absolute;inset:0;background:rgba(0,0,0,0.85);backdrop-filter:blur(8px)}
.modal-content{position:relative;z-index:1;width:90%;max-width:900px;background:var(--c-bg2);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--c-border);box-shadow:var(--shadow-lg)}
.modal-close{position:absolute;top:16px;right:16px;z-index:2;width:36px;height:36px;background:rgba(0,0,0,0.6);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;cursor:pointer;transition:var(--trans)}
.modal-close:hover{background:var(--c-primary);transform:rotate(90deg)}
.modal-video-player{width:100%;aspect-ratio:16/9;background:#000}
.modal-video-player video,.modal-video-player iframe{width:100%;height:100%;border:none}
.modal-video-info{padding:20px}
.modal-video-title{font-size:18px;font-weight:700;margin-bottom:8px;color:var(--c-white)}
.modal-video-desc{font-size:14px;color:var(--c-text2);margin-bottom:12px;line-height:1.7}
.modal-video-tags{display:flex;flex-wrap:wrap;gap:8px}
.modal-tag{padding:4px 12px;background:rgba(123,47,190,0.15);border:1px solid var(--c-border);border-radius:12px;font-size:12px;color:var(--c-accent)}

/* ── 标签页 ── */
.tabs{}
.tab-nav{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:32px;border-bottom:1px solid var(--c-border);padding-bottom:0}
.tab-btn{padding:10px 22px;border-radius:8px 8px 0 0;font-size:14px;font-weight:600;color:var(--c-text2);transition:var(--trans);border-bottom:2px solid transparent;margin-bottom:-1px}
.tab-btn:hover{color:var(--c-white);background:rgba(123,47,190,0.1)}
.tab-btn.active{color:var(--c-white);border-bottom-color:var(--c-primary);background:rgba(123,47,190,0.12)}
.tab-pane{display:none}
.tab-pane.active{display:block}

/* ── 功能卡片 ── */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px}
.feature-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);padding:28px;transition:var(--trans);position:relative;overflow:hidden}
.feature-card::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(123,47,190,0.05),transparent);opacity:0;transition:var(--trans)}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(123,47,190,0.4)}
.feature-card:hover::before{opacity:1}
.feature-icon{width:52px;height:52px;background:linear-gradient(135deg,rgba(123,47,190,0.2),rgba(155,79,222,0.1));border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px;border:1px solid var(--c-border)}
.feature-title{font-size:16px;font-weight:700;color:var(--c-white);margin-bottom:8px}
.feature-desc{font-size:13px;color:var(--c-text2);line-height:1.7}

/* ── 专家卡片 ── */
.experts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:24px}
.expert-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);padding:24px;text-align:center;transition:var(--trans)}
.expert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(123,47,190,0.4)}
.expert-avatar{width:80px;height:80px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:3px solid var(--c-primary)}
.expert-name{font-size:16px;font-weight:700;color:var(--c-white);margin-bottom:4px}
.expert-role{font-size:13px;color:var(--c-accent);margin-bottom:12px}
.expert-desc{font-size:13px;color:var(--c-text2);line-height:1.6;margin-bottom:16px}
.expert-links{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.expert-link{padding:6px 14px;background:rgba(123,47,190,0.12);border:1px solid var(--c-border);border-radius:16px;font-size:12px;color:var(--c-accent);transition:var(--trans)}
.expert-link:hover{background:rgba(123,47,190,0.25);color:var(--c-white)}

/* ── 评论 ── */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);padding:24px;transition:var(--trans)}
.review-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--c-primary),#9B4FDE);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;font-weight:700;color:#fff}
.review-author{font-size:14px;font-weight:600;color:var(--c-white)}
.review-stars{color:#F59E0B;font-size:13px;margin-top:2px}
.review-content{font-size:14px;color:var(--c-text2);line-height:1.7}

/* ── FAQ ── */
.faq-list{display:flex;flex-direction:column;gap:12px;max-width:800px;margin:0 auto}
.faq-item{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);overflow:hidden;transition:var(--trans)}
.faq-item.faq-open{border-color:rgba(123,47,190,0.5)}
.faq-question{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;cursor:pointer;font-size:15px;font-weight:600;color:var(--c-text);transition:var(--trans)}
.faq-question:hover{color:var(--c-white)}
.faq-arrow{font-size:12px;color:var(--c-text3);transition:transform 0.3s;flex-shrink:0;margin-left:12px}
.faq-item.faq-open .faq-arrow{transform:rotate(180deg);color:var(--c-accent)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.35s ease}
.faq-answer-inner{padding:0 24px 18px;font-size:14px;color:var(--c-text2);line-height:1.8}

/* ── 合作Logo墙 ── */
.partner-logos{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:center}
.partner-logo{padding:12px 24px;background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);font-size:14px;font-weight:600;color:var(--c-text2);transition:var(--trans)}
.partner-logo:hover{border-color:rgba(123,47,190,0.5);color:var(--c-white);transform:translateY(-2px)}

/* ── 二维码 ── */
.qr-codes{display:flex;gap:32px;justify-content:center;flex-wrap:wrap}
.qr-code-box{text-align:center}
.qr-code-item{width:120px;height:120px;background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;margin:0 auto 10px;font-size:48px}
.qr-label{font-size:13px;color:var(--c-text2)}

/* ── 分享条 ── */
.share-strip{display:flex;align-items:center;gap:12px;padding:16px 24px;background:var(--c-bg3);border-radius:var(--radius);border:1px solid var(--c-border);flex-wrap:wrap}
.share-label{font-size:14px;color:var(--c-text2);flex-shrink:0}
.share-btn{padding:8px 18px;border-radius:20px;font-size:13px;font-weight:600;transition:var(--trans);border:1px solid var(--c-border)}
.share-btn.wechat{background:rgba(7,193,96,0.1);color:#07C160;border-color:rgba(7,193,96,0.3)}
.share-btn.weibo{background:rgba(230,22,45,0.1);color:#E6162D;border-color:rgba(230,22,45,0.3)}
.share-btn.douyin{background:rgba(0,0,0,0.3);color:#fff;border-color:rgba(255,255,255,0.2)}
.share-btn.bilibili{background:rgba(0,161,214,0.1);color:#00A1D6;border-color:rgba(0,161,214,0.3)}
.share-btn:hover{transform:translateY(-2px);opacity:0.85}

/* ── 联系卡片 ── */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px}
.contact-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);padding:24px;transition:var(--trans)}
.contact-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:rgba(123,47,190,0.4)}
.contact-icon{font-size:32px;margin-bottom:12px}
.contact-title{font-size:15px;font-weight:700;color:var(--c-white);margin-bottom:6px}
.contact-value{font-size:14px;color:var(--c-accent)}
.contact-desc{font-size:13px;color:var(--c-text3);margin-top:4px}

/* ── 面包屑 ── */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--c-text3);padding:16px 0;flex-wrap:wrap}
.breadcrumb a{color:var(--c-text3);transition:var(--trans)}
.breadcrumb a:hover{color:var(--c-accent)}
.breadcrumb .sep{color:var(--c-text3)}
.breadcrumb .current{color:var(--c-text2)}

/* ── 标签云 ── */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.tag-item{padding:6px 16px;background:rgba(123,47,190,0.1);border:1px solid var(--c-border);border-radius:20px;font-size:13px;color:var(--c-text2);transition:var(--trans);cursor:pointer}
.tag-item:hover{background:rgba(123,47,190,0.25);color:var(--c-white);border-color:rgba(123,47,190,0.5)}

/* ── 加载更多 ── */
.load-more-wrap{text-align:center;margin-top:40px}

/* ── 返回顶部 ── */
.back-to-top{position:fixed;bottom:32px;right:32px;width:44px;height:44px;background:linear-gradient(135deg,var(--c-primary),#9B4FDE);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(16px);transition:var(--trans);z-index:900;box-shadow:var(--shadow)}
.back-to-top.visible{opacity:1;visibility:visible;transform:translateY(0)}
.back-to-top:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}

/* ── 页脚 ── */
.footer{background:var(--c-bg2);border-top:1px solid var(--c-border);padding:60px 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:10px;margin-bottom:16px}
.footer-logo-img{width:36px;height:36px;border-radius:50%;object-fit:cover;border:2px solid var(--c-primary)}
.footer-logo-text{font-size:16px;font-weight:700;background:linear-gradient(135deg,var(--c-white),var(--c-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.footer-desc{font-size:13px;color:var(--c-text3);line-height:1.8;margin-bottom:20px}
.footer-title{font-size:14px;font-weight:700;color:var(--c-white);margin-bottom:16px;padding-bottom:8px;border-bottom:1px solid var(--c-border)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-link{font-size:13px;color:var(--c-text3);transition:var(--trans)}
.footer-link:hover{color:var(--c-accent);padding-left:4px}
.footer-bottom{border-top:1px solid var(--c-border);padding:20px 0;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:var(--c-text3)}
.footer-copyright{}
.footer-icp a{color:var(--c-text3);transition:var(--trans)}
.footer-icp a:hover{color:var(--c-accent)}
.footer-update{color:var(--c-text3)}

/* ── 动画 ── */
.animate-on-scroll{opacity:0;transform:translateY(30px);transition:opacity 0.6s ease,transform 0.6s ease}
.animate-on-scroll.animated{opacity:1;transform:translateY(0)}
.pulse-glow{animation:pulse-glow 3s ease-in-out infinite}
@keyframes pulse-glow{0%,100%{box-shadow:0 0 20px rgba(123,47,190,0.3)}50%{box-shadow:0 0 40px rgba(123,47,190,0.6)}}
.bg-glow{position:absolute;border-radius:50%;filter:blur(80px);pointer-events:none;z-index:0}

/* ── 内页布局 ── */
.page-hero{padding:140px 0 60px;background:linear-gradient(135deg,var(--c-bg) 0%,var(--c-bg2) 100%);border-bottom:1px solid var(--c-border);position:relative;overflow:hidden}
.page-hero-title{font-size:clamp(28px,3.5vw,44px);font-weight:800;margin-bottom:12px;background:linear-gradient(135deg,var(--c-white),var(--c-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.page-hero-desc{font-size:15px;color:var(--c-text2);max-width:600px;line-height:1.8}

/* ── 响应式 ── */
@media(max-width:1024px){
  .video-grid.cols-4{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .banner-inner{grid-template-columns:1fr;text-align:center}
  .banner-img{display:none}
  .banner-actions{justify-content:center}
  .banner-stats{justify-content:center}
}
@media(max-width:768px){
  .section{padding:56px 0}
  .nav-menu,.nav-actions .btn{display:none}
  .hamburger{display:flex}
  .video-grid.cols-4,.video-grid.cols-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .banner-stats{gap:20px}
  .experts-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:1fr}
  .modal-content{width:95%}
  .back-to-top{bottom:20px;right:20px}
}
@media(max-width:480px){
  .video-grid,.video-grid.cols-4,.video-grid.cols-3{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .experts-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .banner-actions{flex-direction:column;align-items:center}
  .share-strip{justify-content:center}
}