:root{--color-bg:#f8fafc;--color-surface:#fff;--color-text-primary:#0f172a;--color-text-secondary:#64748b;--color-text-muted:#94a3b8;--color-primary:#3b82f6;--color-primary-hover:#2563eb;--color-secondary:#14b8a6;--color-secondary-hover:#0d9488;--color-accent:#f43f5e;--color-accent-hover:#e11d48;--color-border:#e2e8f0;--color-border-hover:#cbd5e1;--color-success:#10b981;--color-warning:#f59e0b;--color-danger:#ef4444;--font-family:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--radius-sm:8px;--radius-md:12px;--radius-lg:20px;--radius-full:9999px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000000d, 0 2px 4px -1px #00000008;--shadow-lg:0 10px 15px -3px #0000000d, 0 4px 6px -2px #00000008;--shadow-glass:0 8px 32px 0 #1f268712;--transition-fast:.15s ease-in-out;--transition-normal:.3s 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var(--color-border);background-color:#0000}.btn-outline:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-primary)}.btn-ghost{color:var(--color-text-secondary);background-color:#0000}.btn-ghost:hover:not(:disabled){color:var(--color-text-primary);background-color:#0000000d}.icon-btn{aspect-ratio:1;border-radius:50%;justify-content:center;align-items:center;padding:10px;display:inline-flex}.input-wrapper{flex-direction:column;width:100%;margin-bottom:16px;display:flex}.input-label{color:var(--color-text-primary);margin-bottom:6px;font-size:.875rem;font-weight:600}.input-field{border:1px solid var(--color-border);border-radius:var(--radius-md);background-color:var(--color-bg);color:var(--color-text-primary);transition:all var(--transition-fast);outline:none;padding:12px 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#ffffff80}.card-interactive{cursor:pointer}.card-interactive:hover{box-shadow:var(--shadow-md);border-color:var(--color-primary);transform:translateY(-4px)}.modal-overlay{-webkit-backdrop-filter:blur(4px);z-index:1000;animation:fadeIn var(--transition-fast);background-color:#1a535c66;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal-content{width:100%;max-width:500px;max-height:90vh;animation:slideUp var(--transition-fast);padding:0;overflow-y:auto}.modal-header{border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;padding:20px 24px;display:flex}.modal-title{color:var(--color-text-primary);margin:0;font-size:1.25rem}.modal-close-btn{cursor:pointer;color:var(--color-text-muted);transition:color var(--transition-fast);border-radius:var(--radius-sm);background:0 0;border:none;justify-content:center;align-items:center;padding:4px;display:flex}.modal-close-btn:hover{color:var(--color-text-primary);background-color:var(--color-bg)}.modal-body{padding:24px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.auth-container{background-color:var(--color-bg);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.auth-card{border-radius:var(--radius-lg);width:100%;max-width:400px;box-shadow:var(--shadow-lg);border:1px solid var(--color-border);animation:slideUp var(--transition-normal);background:#fff;padding:40px}.auth-header{text-align:center;margin-bottom:24px}.auth-header h2{color:var(--color-text-primary);margin-bottom:8px;font-size:1.75rem}.auth-header p{color:var(--color-text-secondary)}.auth-form{flex-direction:column;display:flex}.auth-error{color:var(--color-danger);border-radius:var(--radius-sm);text-align:center;background-color:#ef44441a;margin-bottom:16px;padding:12px;font-size:.875rem}.auth-footer{text-align:center;color:var(--color-text-secondary);margin-top:24px;font-size:.875rem}.auth-link{color:var(--color-primary);cursor:pointer;transition:color var(--transition-fast);font-weight:600}.auth-link:hover{color:var(--color-primary-hover);text-decoration:underline}.auth-card-wide{max-width:520px}.auth-interest-options{flex-wrap:wrap;gap:8px;margin-bottom:16px;display:flex}.auth-interest-chip{border:1px solid var(--color-border);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);background:#fff;border-radius:999px;padding:8px 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var(--color-accent));-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-weight:700}.navbar-actions{align-items:center;gap:12px;display:flex}.lang-switch{border:1px solid var(--color-border);color:var(--color-text-secondary);cursor:pointer;transition:color var(--transition-fast), border-color var(--transition-fast);background:0 0;border-radius:999px;padding:4px 10px;font-size:.8125rem;font-weight:600}.lang-switch:hover{color:var(--color-primary);border-color:var(--color-primary)}.page-container{flex-direction:column;min-height:100vh;display:flex}.main-content{flex:1;width:100%;max-width:1200px;margin:0 auto;padding:40px 24px}.hero-section{text-align:center;animation:fadeIn var(--transition-normal);margin-bottom:48px}.hero-section h1{color:var(--color-text-primary);background:linear-gradient(90deg, var(--color-primary), var(--color-accent));-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:16px;font-size:2.5rem}.hero-section p{color:var(--color-text-secondary);margin-bottom:32px;font-size:1.125rem}.search-bar{align-items:flex-start;gap:12px;max-width:600px;margin:0 auto 24px;display:flex}.search-bar .input-wrapper{margin-bottom:0}.filter-chips{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.chip{border-radius:var(--radius-full);border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text-primary);cursor:pointer;transition:all var(--transition-fast);padding:6px 16px;font-size:.875rem}.chip:hover{border-color:var(--color-primary);color:var(--color-primary)}.chip.active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.activity-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px;display:grid}.activity-card-header{justify-content:space-between;margin-bottom:16px;display:flex}.category-badge{background:var(--color-bg);border-radius:var(--radius-full);color:var(--color-primary);padding:4px 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h3{margin-bottom:8px;font-size:1.5rem}.empty-state p{color:var(--color-text-secondary);margin-bottom:24px}.empty-actions{justify-content:center;gap:16px;display:flex}.detail-grid{grid-template-columns:2fr 1fr;gap:32px;margin-top:24px;display:grid}.detail-main .detail-card{padding:32px}.detail-title-row{justify-content:space-between;align-items:flex-start;margin-bottom:8px;display:flex}.detail-title-row h2{color:var(--color-text-primary);margin:0;font-size:2rem}.detail-time{color:var(--color-primary);margin-bottom:24px;font-size:1.125rem;font-weight:600}.detail-info{background:var(--color-bg);border-radius:var(--radius-md);grid-template-columns:1fr 1fr;gap:16px;margin-bottom:32px;padding:20px;display:grid}.info-item{color:var(--color-text-secondary);font-size:.875rem}.info-item strong{color:var(--color-text-primary)}.detail-desc h3{color:var(--color-text-primary);margin-bottom:12px;font-size:1.25rem}.detail-desc p{color:var(--color-text-secondary);margin-bottom:12px;line-height:1.6}.desc-en{color:var(--color-text-muted);font-style:italic}.action-card{position:sticky;top:100px}.host-info{background:var(--color-bg);border-radius:var(--radius-md);flex-direction:column;margin-bottom:24px;padding:12px;display:flex}.host-info strong{color:var(--color-primary);font-size:1.125rem}.action-buttons{flex-direction:column;gap:12px;display:flex}.participant-item{border-bottom:1px solid var(--color-border);color:var(--color-text-secondary);padding:8px 0}.participant-item:last-child{border-bottom:none}.review-item{background:var(--color-bg);border-radius:var(--radius-md);margin-bottom:12px;padding:16px}@media (width<=768px){.detail-grid{grid-template-columns:1fr}}.ai-entry-card{text-align:left;background:var(--color-surface);border:1px solid 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(width<=768px){.ai-entry-card{flex-direction:column;align-items:stretch;padding:20px}.empty-actions,.search-bar{flex-direction:column}}.participant-item{justify-content:space-between;align-items:center;gap:12px;display:flex}.participant-main{flex-direction:column;min-width:0;display:flex}.participant-main span,.participant-main small{overflow-wrap:anywhere}.host-contact-box{border-radius:var(--radius-md);color:#1e3a8a;background:#eff6ff;gap:8px;margin-bottom:18px;padding:12px;font-size:.875rem;display:grid}.host-contact-box strong{color:#1d4ed8}.contact-row{overflow-wrap:anywhere}@media (width<=768px){.participant-item{flex-direction:column;align-items:flex-start}}.ai-layout{grid-template-columns:1fr 1fr;gap:40px;display:grid}.ai-title{background:linear-gradient(90deg,#8b5cf6,#ec4899);-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:12px;font-size:2.5rem}.ai-subtitle{color:var(--color-text-secondary);margin-bottom:32px;font-size:1.125rem}.recommend-form{flex-direction:column;display:flex}.loading-state{height:100%;min-height:400px;color:var(--color-primary);flex-direction:column;justify-content:center;align-items:center;display:flex}.spinner{border:4px solid #4ecdc433;border-top-color:var(--color-primary);border-radius:50%;width:48px;height:48px;margin-bottom:16px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.animate-fade-in{animation:fadeIn var(--transition-normal)}.empty-results{text-align:center;border:2px dashed var(--color-border);border-radius:var(--radius-lg);height:100%;min-height:400px;color:var(--color-text-secondary);flex-direction:column;justify-content:center;align-items:center;padding:40px;display:flex}.empty-results h3{color:var(--color-text-primary);margin-bottom:12px}.fallback-warning{color:#b45309;border-radius:var(--radius-md);background:#fffbeb;border:1px solid #fde68a;margin-bottom:24px;padding:12px 16px;font-weight:500}.suggestion-card{border-left:4px solid var(--color-primary);margin-bottom:20px}.sugg-header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.sugg-header h3{color:var(--color-text-primary);margin:0;font-size:1.25rem}.sugg-desc{color:var(--color-text-secondary);margin-bottom:16px;line-height:1.5}.sugg-meta{color:var(--color-text-muted);border-bottom:1px solid var(--color-border);gap:16px;margin-bottom:16px;padding-bottom:16px;font-size:.875rem;display:flex}.sugg-reason,.sugg-tips{color:var(--color-text-secondary);margin-bottom:8px;font-size:.875rem}.sugg-reason strong,.sugg-tips strong{color:var(--color-text-primary)}.matching-card{margin-bottom:16px}@media (width<=768px){.ai-layout{grid-template-columns:1fr}}.profile-header{flex-direction:column;align-items:center;margin-bottom:40px;display:flex}.avatar-placeholder{background:linear-gradient(135deg, var(--color-primary), var(--color-accent));color:#fff;width:100px;height:100px;box-shadow:var(--shadow-md);border-radius:50%;justify-content:center;align-items:center;margin-bottom:16px;font-size:3rem;font-weight:700;display:flex}.profile-header h2{color:var(--color-text-primary);margin-bottom:4px;font-size:2rem}.profile-header p{color:var(--color-text-secondary)}.profile-tabs{border-bottom:1px solid var(--color-border);justify-content:center;gap:16px;margin-bottom:32px;padding-bottom:16px;display:flex}.tab{color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);border-radius:var(--radius-sm);background:0 0;border:none;padding:8px 16px;font-size:1.125rem;font-weight:600}.tab:hover{background:var(--color-bg);color:var(--color-text-primary)}.tab.active{color:var(--color-primary);background:#4ecdc41a}.stats-grid{grid-template-columns:2fr 1fr;gap:24px;display:grid}.stats-info{gap:24px;margin-top:24px;display:flex}.stat-box{background:var(--color-bg);border-radius:var(--radius-md);text-align:center;flex-direction:column;flex:1;padding:20px;display:flex}.stat-value{color:var(--color-primary);margin-bottom:8px;font-size:2.5rem;font-weight:700}.stat-label{color:var(--color-text-secondary);font-size:.875rem}.activity-list{flex-direction:column;gap:16px;max-width:800px;margin:0 auto;display:flex}.act-list-item{padding:20px}.act-list-header{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.act-list-header h4{color:var(--color-text-primary);margin:0;font-size:1.25rem}.act-list-item p{color:var(--color-text-secondary);margin-bottom:16px}.act-list-item a{color:var(--color-primary);font-weight:600}.empty-msg{text-align:center;color:var(--color-text-muted);padding:40px}.school-pill{border-radius:var(--radius-full);background:var(--color-bg);color:var(--color-primary);margin-top:8px;padding:4px 12px;font-size:.875rem;font-weight:700;display:inline-flex}.category-profile{margin-top:28px}.category-profile h4,.interest-summary strong,.interest-picker strong{color:var(--color-text-primary);margin-bottom:12px;display:block}.category-row{margin-bottom:14px}.category-row-label{color:var(--color-text-secondary);justify-content:space-between;margin-bottom:6px;font-size:.875rem;display:flex}.category-bar{border-radius:var(--radius-full);background:var(--color-bg);height:8px;overflow:hidden}.category-bar span{background:var(--color-primary);border-radius:var(--radius-full);height:100%;display:block}.interest-summary{margin-bottom:24px}.interest-tags,.interest-options{flex-wrap:wrap;gap:8px;display:flex}.interest-picker{flex-direction:column;gap:14px;display:flex}.interest-chip{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text-primary);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast);padding:6px 12px}.interest-chip.active{border-color:var(--color-primary);color:var(--color-primary);background:#4ecdc424;font-weight:700}.profile-message{color:var(--color-primary);margin:0;font-size:.875rem}.profile-message.error{color:var(--color-danger)}.muted-text{color:var(--color-text-muted)}.empty-msg.small{text-align:left;padding:12px 0}.activity-toolbar{justify-content:flex-end;margin-bottom:8px;display:flex}.activity-toolbar .input-field{max-width:180px}.empty-profile-state{text-align:center;border:1px dashed var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);padding:48px}.empty-profile-state h3{color:var(--color-text-primary);margin-bottom:8px}.empty-profile-state p{color:var(--color-text-secondary);margin-bottom:16px}.empty-profile-state a{color:var(--color-primary);font-weight:700}@media (width<=768px){.stats-grid,.stats-info{flex-direction:column;grid-template-columns:1fr}.profile-tabs{justify-content:flex-start;overflow-x:auto}.act-list-header{align-items:flex-start;gap:12px}}.contact-form{border-bottom:1px solid var(--color-border);flex-direction:column;gap:14px;margin-bottom:24px;padding-bottom:24px;display:flex}.contact-form strong{color:var(--color-text-primary)}.admin-tabs{border-bottom:1px solid var(--color-border);gap:16px;margin-bottom:32px;padding-bottom:16px;display:flex}.kpi-grid{grid-template-columns:repeat(4,1fr);gap:24px;display:grid}.kpi-card{text-align:center;padding:32px 24px}.kpi-value{color:var(--color-primary);margin-bottom:8px;font-size:3rem;font-weight:800}.kpi-label{color:var(--color-text-secondary);font-weight:500}.admin-table{border-collapse:collapse;width:100%;margin-top:16px}.admin-table th,.admin-table td{text-align:left;border-bottom:1px solid var(--color-border);padding:12px 16px}.admin-table th{background-color:var(--color-bg);color:var(--color-text-secondary);font-weight:600}.admin-table a{color:var(--color-primary)}.admin-table a:hover{text-decoration:underline}@media (width<=768px){.kpi-grid{grid-template-columns:1fr 1fr}}.chart-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin-top:32px;display:grid}.chart-container{min-height:340px}.library-header{justify-content:space-between;align-items:center;gap:16px;margin-bottom:16px;display:flex}.admin-tabs.compact{margin-bottom:16px;padding-bottom:12px;overflow-x:auto}@media (width<=960px){.kpi-grid,.chart-grid{grid-template-columns:1fr 1fr}}@media (width<=768px){.chart-grid,.kpi-grid{grid-template-columns:1fr}.admin-table{display:block;overflow-x:auto}}