/* ============================================
   糖心vlog 全新原创样式表
   配色：冰川蓝 #0EA5E9 + 落日橘 #F97316 + 暗夜黑 #0F172A
   字体：系统中文字体栈
   ============================================ */

/* === CSS Variables === */
:root {
  --primary: #0EA5E9;
  --primary-dark: #0284C7;
  --primary-light: #38BDF8;
  --accent: #F97316;
  --accent-dark: #EA580C;
  --accent-light: #FB923C;
  --dark: #0F172A;
  --dark-mid: #1E293B;
  --dark-light: #334155;
  --gray: #64748B;
  --gray-light: #94A3B8;
  --gray-bg: #F1F5F9;
  --white: #FFFFFF;
  --success: #10B981;
  --danger: #EF4444;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 20px rgba(15,23,42,0.08);
  --shadow-lg: 0 12px 40px rgba(15,23,42,0.12);
  --shadow-glow: 0 0 30px rgba(14,165,233,0.15);
  --transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
  --font-cn: 'PingFang SC','Hiragino Sans GB','Microsoft YaHei','WenQuanYi Micro Hei',sans-serif;
}

/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:var(--font-cn);color:var(--dark);background:var(--white);line-height:1.75;overflow-x:hidden}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3;color:var(--dark)}

/* === Container === */
.container{max-width:1240px;margin:0 auto;padding:0 20px}

/* === Header / Navigation === */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(15,23,42,0.95);backdrop-filter:blur(16px);border-bottom:1px solid rgba(14,165,233,0.15);transition:var(--transition)}
.site-header.scrolled{background:rgba(15,23,42,0.98);box-shadow:0 2px 20px rgba(0,0,0,0.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo-area{display:flex;align-items:center;gap:10px}
.logo-area img{height:40px;width:auto}
.logo-area .brand-name{font-size:1.4rem;font-weight:800;color:var(--white);letter-spacing:1px}
.logo-area .brand-name span{color:var(--accent)}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{color:rgba(255,255,255,0.8);font-size:0.9rem;padding:8px 14px;border-radius:var(--radius-sm);transition:var(--transition);font-weight:500}
.main-nav a:hover,.main-nav a.active{color:var(--white);background:rgba(14,165,233,0.2)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--white);transition:var(--transition);border-radius:2px}

/* === Hero Section === */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;overflow:hidden;background:linear-gradient(135deg,var(--dark) 0%,var(--dark-mid) 50%,#0C2D48 100%);padding-top:70px}
.hero::before{content:'';position:absolute;top:-50%;right:-30%;width:80%;height:200%;background:radial-gradient(ellipse,rgba(14,165,233,0.12) 0%,transparent 70%);pointer-events:none}
.hero::after{content:'';position:absolute;bottom:-40%;left:-20%;width:60%;height:150%;background:radial-gradient(ellipse,rgba(249,115,22,0.08) 0%,transparent 70%);pointer-events:none}
.hero-content{position:relative;z-index:2;display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero-text h1{font-size:3rem;color:var(--white);margin-bottom:16px;line-height:1.2}
.hero-text h1 .highlight{color:var(--accent);position:relative}
.hero-text h1 .highlight::after{content:'';position:absolute;bottom:-4px;left:0;width:100%;height:3px;background:var(--accent);border-radius:2px}
.hero-text .subtitle{font-size:1.2rem;color:rgba(255,255,255,0.7);margin-bottom:28px;line-height:1.8}
.hero-text .hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:30px}
.hero-text .hero-tags span{background:rgba(14,165,233,0.15);color:var(--primary-light);padding:6px 16px;border-radius:20px;font-size:0.85rem;border:1px solid rgba(14,165,233,0.25)}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius);font-weight:600;font-size:0.95rem;transition:var(--transition);cursor:pointer;border:none}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--white);box-shadow:0 4px 15px rgba(14,165,233,0.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(14,165,233,0.4);color:var(--white)}
.btn-accent{background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:var(--white);box-shadow:0 4px 15px rgba(249,115,22,0.3)}
.btn-accent:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(249,115,22,0.4);color:var(--white)}
.btn-outline{background:transparent;color:var(--white);border:2px solid rgba(255,255,255,0.3)}
.btn-outline:hover{border-color:var(--primary);background:rgba(14,165,233,0.1);color:var(--white)}
.hero-visual{position:relative}
.hero-visual img{border-radius:var(--radius-lg);box-shadow:0 20px 60px rgba(0,0,0,0.3)}
.hero-visual::before{content:'';position:absolute;top:-15px;right:-15px;width:100%;height:100%;border:2px solid var(--primary);border-radius:var(--radius-lg);opacity:0.3}

/* === Stats Bar === */
.stats-bar{background:var(--dark-mid);border-top:1px solid rgba(14,165,233,0.1);border-bottom:1px solid rgba(14,165,233,0.1);padding:20px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-item .stat-num{font-size:2rem;font-weight:800;color:var(--primary-light);display:block}
.stat-item .stat-label{font-size:0.85rem;color:var(--gray-light);margin-top:4px}

/* === Section Common === */
.section{padding:80px 0}
.section-alt{background:var(--gray-bg)}
.section-dark{background:var(--dark);color:var(--white)}
.section-dark h2,.section-dark h3,.section-dark h4{color:var(--white)}
.section-dark p{color:rgba(255,255,255,0.75)}
.section-header{text-align:center;margin-bottom:50px}
.section-header h2{font-size:2.2rem;margin-bottom:12px;position:relative;display:inline-block}
.section-header h2::after{content:'';display:block;width:60px;height:4px;background:linear-gradient(90deg,var(--primary),var(--accent));margin:12px auto 0;border-radius:2px}
.section-header p{color:var(--gray);font-size:1.05rem;max-width:680px;margin:0 auto}

/* === Video Cards === */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.video-card{position:relative;border-radius:var(--radius);overflow:hidden;background:var(--white);box-shadow:var(--shadow);transition:var(--transition);cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.video-card .thumb{position:relative;padding-top:56.25%;overflow:hidden}
.video-card .thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:var(--transition)}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:56px;height:56px;background:rgba(14,165,233,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:var(--transition);box-shadow:0 4px 20px rgba(14,165,233,0.4)}
.video-card:hover .play-btn{transform:translate(-50%,-50%) scale(1)}
.video-card .play-btn::after{content:'';width:0;height:0;border-left:18px solid var(--white);border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px}
.video-card .duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.8);color:var(--white);padding:2px 8px;border-radius:4px;font-size:0.75rem;font-weight:600}
.video-card .card-body{padding:14px 16px}
.video-card .card-body h4{font-size:0.95rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-body .meta{display:flex;justify-content:space-between;font-size:0.8rem;color:var(--gray)}
.video-card .tag{position:absolute;top:10px;left:10px;background:var(--accent);color:var(--white);padding:3px 10px;border-radius:4px;font-size:0.75rem;font-weight:600;z-index:2}

/* === Service Cards === */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.service-card{background:var(--white);border-radius:var(--radius);padding:36px 28px;box-shadow:var(--shadow);transition:var(--transition);border:1px solid transparent;position:relative;overflow:hidden}
.service-card::before{content:'';position:absolute;top:0;left:0;width:100%;height:4px;background:linear-gradient(90deg,var(--primary),var(--accent));transform:scaleX(0);transition:var(--transition);transform-origin:left}
.service-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(14,165,233,0.15)}
.service-card:hover::before{transform:scaleX(1)}
.service-card .icon{width:56px;height:56px;background:linear-gradient(135deg,rgba(14,165,233,0.1),rgba(249,115,22,0.1));border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1.6rem;margin-bottom:18px}
.service-card h4{font-size:1.15rem;margin-bottom:10px}
.service-card p{color:var(--gray);font-size:0.9rem;line-height:1.7}

/* === Feature Cards (2-col) === */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.feature-card{display:flex;gap:20px;background:var(--white);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:var(--transition)}
.feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.feature-card .feat-icon{flex-shrink:0;width:50px;height:50px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1.4rem;color:var(--white)}
.feature-card h4{font-size:1.05rem;margin-bottom:6px}
.feature-card p{color:var(--gray);font-size:0.88rem}

/* === Expert Team === */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.expert-card{text-align:center;background:var(--white);border-radius:var(--radius);padding:32px 20px;box-shadow:var(--shadow);transition:var(--transition)}
.expert-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.expert-card img{width:110px;height:110px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:3px solid var(--primary-light);box-shadow:0 4px 15px rgba(14,165,233,0.2)}
.expert-card h4{font-size:1.05rem;margin-bottom:4px}
.expert-card .role{color:var(--accent);font-size:0.85rem;font-weight:600;margin-bottom:8px}
.expert-card p{color:var(--gray);font-size:0.82rem;line-height:1.6}

/* === Brand Partners === */
.brand-scroll{display:flex;gap:40px;align-items:center;justify-content:center;flex-wrap:wrap;padding:20px 0}
.brand-scroll .brand-item{font-size:1.1rem;font-weight:700;color:var(--gray-light);padding:12px 24px;border:1px solid rgba(100,116,139,0.2);border-radius:var(--radius-sm);transition:var(--transition)}
.brand-scroll .brand-item:hover{color:var(--primary);border-color:var(--primary);box-shadow:var(--shadow-glow)}

/* === HowTo Steps === */
.howto-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:step}
.howto-step{position:relative;background:var(--white);border-radius:var(--radius);padding:32px 24px;box-shadow:var(--shadow);text-align:center;transition:var(--transition)}
.howto-step:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.howto-step::before{counter-increment:step;content:counter(step);display:flex;align-items:center;justify-content:center;width:44px;height:44px;background:linear-gradient(135deg,var(--primary),var(--accent));color:var(--white);border-radius:50%;font-size:1.2rem;font-weight:800;margin:0 auto 16px}
.howto-step h4{font-size:1.05rem;margin-bottom:8px}
.howto-step p{color:var(--gray);font-size:0.88rem}

/* === Reviews === */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:var(--white);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:var(--transition);border-left:4px solid var(--primary)}
.review-card:hover{box-shadow:var(--shadow-lg)}
.review-card .stars{color:var(--accent);font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{color:var(--dark-light);font-size:0.92rem;line-height:1.7;margin-bottom:14px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:var(--white);font-weight:700;font-size:0.9rem}
.review-card .reviewer .name{font-weight:600;font-size:0.88rem}
.review-card .reviewer .date{font-size:0.78rem;color:var(--gray)}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--white);border-radius:var(--radius);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-item .faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:var(--transition)}
.faq-item .faq-q:hover{color:var(--primary)}
.faq-item .faq-q::after{content:'+';font-size:1.4rem;color:var(--primary);transition:var(--transition);font-weight:300}
.faq-item.active .faq-q::after{content:'-';transform:rotate(180deg)}
.faq-item .faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:max-height 0.4s ease,padding 0.4s ease;color:var(--gray)}
.faq-item.active .faq-a{padding:0 24px 18px;max-height:300px}

/* === Contact & QR === */
.contact-grid{display:grid;grid-template-columns:2fr 1fr;gap:40px;align-items:start}
.contact-info h3{font-size:1.5rem;margin-bottom:16px}
.contact-info .info-item{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--gray-bg)}
.contact-info .info-item .label{color:var(--gray);font-size:0.88rem;min-width:80px}
.contact-info .info-item .value{font-weight:600;color:var(--dark)}
.qr-area{display:flex;gap:20px;justify-content:center}
.qr-area .qr-box{text-align:center}
.qr-area .qr-box img{width:140px;height:140px;border-radius:var(--radius-sm);margin-bottom:8px;border:2px solid var(--gray-bg)}
.qr-area .qr-box p{font-size:0.82rem;color:var(--gray)}

/* === Social Share === */
.social-share{display:flex;gap:12px;justify-content:center;padding:20px 0}
.social-share a{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--gray-bg);color:var(--gray);font-size:1.1rem;transition:var(--transition)}
.social-share a:hover{background:var(--primary);color:var(--white);transform:translateY(-3px)}

/* === MCP Section === */
.mcp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.mcp-card{background:rgba(255,255,255,0.05);border:1px solid rgba(14,165,233,0.2);border-radius:var(--radius);padding:24px;transition:var(--transition)}
.mcp-card:hover{border-color:var(--primary);background:rgba(14,165,233,0.05)}
.mcp-card h4{color:var(--primary-light);margin-bottom:8px}
.mcp-card code{display:block;background:rgba(0,0,0,0.3);padding:10px;border-radius:var(--radius-sm);font-size:0.82rem;color:var(--accent-light);margin-top:10px;word-break:break-all}

/* === Footer === */
.site-footer{background:var(--dark);color:rgba(255,255,255,0.7);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,0.08)}
.footer-grid h4{color:var(--white);font-size:1rem;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-grid h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:var(--accent)}
.footer-grid a{color:rgba(255,255,255,0.6);font-size:0.88rem;display:block;padding:4px 0;transition:var(--transition)}
.footer-grid a:hover{color:var(--primary-light);padding-left:4px}
.footer-grid .footer-about p{font-size:0.88rem;line-height:1.7;margin-bottom:12px}
.footer-grid .footer-about img{height:36px;margin-bottom:12px}
.footer-bottom{text-align:center;padding:20px 0;font-size:0.82rem;color:rgba(255,255,255,0.5)}
.footer-bottom a{color:var(--primary-light)}

/* === Breadcrumb === */
.breadcrumb{padding:90px 0 20px;background:var(--gray-bg)}
.breadcrumb-list{display:flex;gap:8px;font-size:0.88rem;color:var(--gray)}
.breadcrumb-list a{color:var(--primary)}
.breadcrumb-list span{color:var(--gray-light)}

/* === Inner Page Hero === */
.page-hero{background:linear-gradient(135deg,var(--dark),var(--dark-mid));padding:120px 0 60px;text-align:center}
.page-hero h1{color:var(--white);font-size:2.4rem;margin-bottom:12px}
.page-hero p{color:rgba(255,255,255,0.7);font-size:1.05rem}

/* === Responsive === */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .service-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .howto-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .hero-content{grid-template-columns:1fr;gap:30px}
  .hero-text h1{font-size:2.2rem}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .main-nav{position:fixed;top:70px;left:0;width:100%;background:rgba(15,23,42,0.98);flex-direction:column;padding:20px;gap:4px;transform:translateY(-120%);transition:var(--transition);border-bottom:2px solid var(--primary)}
  .main-nav.open{transform:translateY(0)}
  .nav-toggle{display:flex}
  .hero{min-height:auto;padding:100px 0 60px}
  .hero-text h1{font-size:1.8rem}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid{grid-template-columns:1fr}
  .service-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .howto-grid{grid-template-columns:1fr}
  .mcp-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:50px 0}
  .section-header h2{font-size:1.6rem}
  .hero-btns{flex-direction:column}
}
@media(max-width:480px){
  .container{padding:0 15px}
  .hero-text h1{font-size:1.5rem}
  .btn{padding:10px 20px;font-size:0.88rem}
  .header-inner{height:60px}
}