/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:#f0f2f5;color:#333;line-height:1.6;min-height:100vh}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{cursor:pointer;font-family:inherit}
input,textarea,select{font-family:inherit;font-size:inherit}
/* ===== Utility ===== */
.hidden{display:none!important}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
/* ===== Header ===== */
.site-header{background:#1a3a5c;color:#fff;padding:0 20px;height:64px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;box-shadow:0 2px 8px rgba(0,0,0,.15)}
.site-header .logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;letter-spacing:1px}
.site-header .logo svg{flex-shrink:0}
.header-actions{display:flex;align-items:center;gap:12px}
.header-actions .user-info{font-size:.9rem;opacity:.9}
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;border-radius:6px;border:none;font-size:.9rem;font-weight:500;transition:all .2s}
.btn-primary{background:#4a90d9;color:#fff}
.btn-primary:hover{background:#357abd}
.btn-success{background:#52c41a;color:#fff}
.btn-success:hover{background:#49b018}
.btn-danger{background:#ff4d4f;color:#fff}
.btn-danger:hover{background:#e04345}
.btn-outline{background:transparent;border:1.5px solid rgba(255,255,255,.7);color:#fff}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.1)}
.btn-sm{padding:5px 12px;font-size:.82rem}
.btn-link{background:none;border:none;color:#4a90d9;padding:4px 8px;font-size:.85rem}
.btn-link:hover{text-decoration:underline}
.btn-link-danger{color:#ff4d4f}
/* ===== Modal ===== */
.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);z-index:200;display:flex;align-items:center;justify-content:center;animation:fadeIn .2s}
.modal{background:#fff;border-radius:12px;width:90%;max-width:480px;max-height:90vh;overflow-y:auto;padding:32px;box-shadow:0 20px 60px rgba(0,0,0,.2);animation:slideUp .25s}
.modal h2{font-size:1.4rem;margin-bottom:20px;text-align:center;color:#1a3a5c}
.modal .close-btn{float:right;background:none;border:none;font-size:1.5rem;color:#999;line-height:1}
.modal .close-btn:hover{color:#333}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:.88rem;font-weight:500;color:#555;margin-bottom:4px}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:10px 14px;border:1.5px solid #d9d9d9;border-radius:6px;outline:none;transition:border-color .2s;font-size:.95rem}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:#4a90d9;box-shadow:0 0 0 3px rgba(74,144,217,.12)}
.form-group textarea{resize:vertical;min-height:80px}
.form-group .error-text{color:#ff4d4f;font-size:.8rem;margin-top:4px;display:none}
.form-actions{display:flex;gap:12px;justify-content:center;margin-top:20px}
.form-actions .btn{min-width:100px;justify-content:center}
.form-switch{text-align:center;margin-top:14px;font-size:.88rem;color:#666}
.form-switch a{color:#4a90d9;cursor:pointer}
.form-switch a:hover{text-decoration:underline}
/* ===== Hero / Visitor ===== */
#visitor-view{min-height:calc(100vh - 64px);display:flex;flex-direction:column}
.hero{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 20px;background:linear-gradient(135deg,#1a3a5c 0%,#2c5f8a 100%);color:#fff;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.05) 0%,transparent 70%);animation:heroPulse 8s ease-in-out infinite}
@keyframes heroPulse{0%,100%{transform:scale(1)}50%{transform:scale(1.1)}}
.hero-content{position:relative;z-index:1;max-width:800px}
.hero h1{font-size:3rem;font-weight:800;margin-bottom:8px;letter-spacing:3px}
.hero .subtitle{font-size:1.15rem;opacity:.85;margin-bottom:32px}
.hero .video-container{width:100%;max-width:720px;margin:0 auto 28px;border-radius:12px;overflow:hidden;box-shadow:0 8px 32px rgba(0,0,0,.3);aspect-ratio:16/9;background:#000;position:relative;cursor:pointer}
.hero .video-container video,.hero .video-container iframe{width:100%;height:100%;display:block;border:none}
.hero .video-placeholder{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(135deg,#2c3e50,#4a6a8a);color:#fff;gap:16px}
.hero .video-placeholder svg{opacity:.7}
.hero .video-placeholder span{font-size:1.1rem;opacity:.8}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-top:8px}
.hero-actions .btn{font-size:1rem;padding:12px 32px;border-radius:8px}
.btn-hero-primary{background:#fff;color:#1a3a5c;border:none}
.btn-hero-primary:hover{background:#f0f0f0;transform:translateY(-1px)}
.btn-hero-secondary{background:transparent;border:2px solid rgba(255,255,255,.7);color:#fff}
.btn-hero-secondary:hover{background:rgba(255,255,255,.1);border-color:#fff;transform:translateY(-1px)}
.features-bar{background:#fff;padding:20px 0;border-bottom:1px solid #e8e8e8}
.features-bar .container{display:flex;justify-content:center;gap:40px;flex-wrap:wrap}
.features-bar .feature-item{display:flex;align-items:center;gap:10px;color:#555;font-size:.9rem}
.features-bar .feature-item svg{flex-shrink:0}
/* ===== Dashboard (Member + Admin) ===== */
#dashboard-view{min-height:calc(100vh - 64px);display:flex;flex-direction:column}
.dash-header{background:#fff;border-bottom:1px solid #e8e8e8;padding:0 20px}
.dash-tabs{display:flex;gap:0;overflow-x:auto;max-width:1200px;margin:0 auto}
.dash-tab{padding:14px 24px;font-size:.92rem;font-weight:500;color:#666;border:none;background:none;cursor:pointer;border-bottom:3px solid transparent;transition:all .2s;white-space:nowrap}
.dash-tab:hover{color:#333;background:#fafafa}
.dash-tab.active{color:#1a3a5c;border-bottom-color:#1a3a5c;font-weight:600}
.dash-content{flex:1;padding:24px 20px;max-width:1200px;margin:0 auto;width:100%}
.dash-section{display:none}
.dash-section.active{display:block;animation:fadeIn .25s}
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:12px}
.section-header h2{font-size:1.25rem;color:#1a3a5c;font-weight:600}
.card{background:#fff;border-radius:10px;padding:20px;margin-bottom:16px;box-shadow:0 1px 4px rgba(0,0,0,.06);border:1px solid #eee}
.card-title{font-size:1rem;font-weight:600;margin-bottom:8px;color:#333}
.card-meta{font-size:.82rem;color:#999;margin-bottom:8px}
.card-meta span{margin-right:16px}
.card-body{font-size:.92rem;color:#555;line-height:1.7;white-space:pre-wrap}
.card-actions{display:flex;gap:8px;margin-top:12px;padding-top:12px;border-top:1px solid #f0f0f0}
.empty-state{text-align:center;padding:48px 20px;color:#999}
.empty-state svg{margin-bottom:12px;opacity:.4}
.empty-state p{font-size:.95rem}
/* ===== Admin specific ===== */
.member-item{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid #f0f0f0;flex-wrap:wrap;gap:8px}
.member-item:last-child{border-bottom:none}
.member-info{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.member-info .avatar{width:36px;height:36px;border-radius:50%;background:#4a90d9;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.85rem;flex-shrink:0}
.member-info .name{font-weight:500;font-size:.92rem}
.member-info .meta{font-size:.82rem;color:#999}
.member-status{padding:3px 10px;border-radius:12px;font-size:.78rem;font-weight:500}
.member-status.approved{background:#f6ffed;color:#52c41a;border:1px solid #b7eb8f}
.member-status.pending{background:#fff7e6;color:#fa8c16;border:1px solid #ffd591}
.member-status.rejected{background:#fff2f0;color:#ff4d4f;border:1px solid #ffccc7}
.filter-bar{display:flex;gap:10px;margin-bottom:16px;flex-wrap:wrap;align-items:center}
.filter-bar select{ padding:6px 12px;border:1.5px solid #d9d9d9;border-radius:6px;outline:none;font-size:.88rem}
.filter-bar select:focus{border-color:#4a90d9}
/* ===== Subject filter pills ===== */
.subject-pills{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.subject-pill{padding:6px 16px;border-radius:20px;border:1.5px solid #d9d9d9;background:#fff;font-size:.85rem;cursor:pointer;transition:all .2s;color:#666}
.subject-pill:hover{border-color:#4a90d9;color:#4a90d9}
.subject-pill.active{background:#4a90d9;color:#fff;border-color:#4a90d9}
/* ===== Animation ===== */
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes slideUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
/* ===== Toast ===== */
.toast-container{position:fixed;top:80px;right:20px;z-index:300;display:flex;flex-direction:column;gap:8px}
.toast{padding:12px 20px;border-radius:8px;color:#fff;font-size:.88rem;box-shadow:0 4px 12px rgba(0,0,0,.15);animation:slideIn .3s;max-width:360px}
.toast.success{background:#52c41a}
.toast.error{background:#ff4d4f}
.toast.info{background:#4a90d9}
@keyframes slideIn{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:translateX(0)}}
/* ===== Responsive ===== */
@media(max-width:768px){
.hero h1{font-size:2rem}
.hero .subtitle{font-size:1rem}
.hero .video-container{max-width:100%;border-radius:8px}
.dash-tab{padding:12px 16px;font-size:.85rem}
.modal{padding:24px 20px}
.member-item{padding:10px 12px}
.member-info{width:100%}
.section-header{flex-direction:column;align-items:stretch}
.features-bar .feature-item{font-size:.82rem}
}
/* ===== Scrollbar ===== */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:#f0f0f0}
::-webkit-scrollbar-thumb{background:#ccc;border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:#aaa}
/* ===== Table ===== */
.data-table{width:100%;border-collapse:collapse;font-size:.9rem}
.data-table th{background:#fafafa;padding:10px 14px;text-align:left;font-weight:600;color:#555;border-bottom:2px solid #eee;white-space:nowrap}
.data-table td{padding:10px 14px;border-bottom:1px solid #f0f0f0;color:#555}
.data-table tr:hover td{background:#fafbfc}
/* ===== Video placeholder ===== */
.promo-thumb{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f2027,#203a43,#2c5364);cursor:pointer;transition:opacity .3s}
.promo-thumb:hover{opacity:.9}
.promo-thumb .play-icon{width:72px;height:72px;border-radius:50%;background:rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;transition:transform .2s,background .2s;backdrop-filter:blur(4px)}
.promo-thumb:hover .play-icon{transform:scale(1.08);background:rgba(255,255,255,.3)}
.promo-thumb .play-icon svg{margin-left:4px}
.promo-thumb .thumb-label{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);background:rgba(0,0,0,.5);color:#fff;padding:6px 16px;border-radius:20px;font-size:.85rem;backdrop-filter:blur(4px)}
.answer-toggle{color:#4a90d9;cursor:pointer;font-size:.85rem;user-select:none}
.answer-toggle:hover{text-decoration:underline}
.answer-content{display:none;margin-top:8px;padding:10px 14px;background:#f6f8fa;border-radius:6px;border-left:3px solid #4a90d9;font-size:.88rem;color:#555}
.answer-content.show{display:block}