:root{--color-primary: #4A9EFF;--color-primary-hover: #3B8AEE;--color-primary-light: #E3F0FF;--color-primary-lighter: #F0F7FF;--color-bg: #FFFFFF;--color-bg-page: #F8F9FA;--color-text-primary: #1A1A1A;--color-text-secondary: #6C757D;--color-text-placeholder: #ADB5BD;--color-border: #E9ECEF;--color-border-light: #F1F3F5;--color-success: #51CF66;--color-danger: #FF6B6B;--color-warning: #FCC419;--shadow-card: 0 2px 12px rgba(0, 0, 0, .06);--shadow-card-hover: 0 4px 20px rgba(0, 0, 0, .1);--shadow-button: 0 2px 8px rgba(74, 158, 255, .2);--shadow-modal: 0 8px 40px rgba(0, 0, 0, .12);--shadow-toast: 0 4px 20px rgba(0, 0, 0, .1);--radius-card: 16px;--radius-button: 12px;--radius-input: 12px;--radius-modal: 16px;--transition-default: cubic-bezier(.4, 0, .2, 1);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--header-height: 64px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);background-color:var(--color-bg-page);color:var(--color-text-primary);line-height:1.6;min-height:100vh}a{color:var(--color-primary);text-decoration:none;transition:color .2s var(--transition-default)}a:hover{color:var(--color-primary-hover)}img{max-width:100%;height:auto}.app-wrapper{min-height:100vh;display:flex;flex-direction:column}.main-content{flex:1;padding-top:calc(var(--header-height) + 24px);padding-bottom:24px}.header-nav{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:var(--color-bg);border-bottom:1px solid var(--color-border);z-index:1000;display:flex;align-items:center;padding:0 24px;box-shadow:0 1px 4px #0000000a}.header-inner{max-width:1200px;width:100%;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.header-logo{display:flex;align-items:center;gap:10px;text-decoration:none}.header-logo img{height:36px;width:auto}.header-nav-links{display:flex;align-items:center;gap:8px;list-style:none;margin:0;padding:0}.header-nav-links a{color:var(--color-text-secondary);padding:8px 16px;border-radius:8px;font-size:14px;font-weight:500;transition:all .2s var(--transition-default)}.header-nav-links a:hover,.header-nav-links a.active{color:var(--color-primary);background:var(--color-primary-lighter)}.header-actions{display:flex;align-items:center;gap:8px}.btn-primary-custom{background:var(--color-primary);color:#fff;border:none;border-radius:var(--radius-button);padding:8px 20px;font-size:14px;font-weight:500;cursor:pointer;transition:all .25s var(--transition-default);box-shadow:var(--shadow-button);display:inline-flex;align-items:center;justify-content:center;gap:6px}.btn-primary-custom:hover{background:var(--color-primary-hover);box-shadow:0 4px 16px #4a9eff59;transform:translateY(-1px);color:#fff}.btn-primary-custom:active{transform:translateY(0);box-shadow:var(--shadow-button)}.btn-outline-custom{background:transparent;color:var(--color-primary);border:1.5px solid var(--color-primary);border-radius:var(--radius-button);padding:7px 20px;font-size:14px;font-weight:500;cursor:pointer;transition:all .25s var(--transition-default);display:inline-flex;align-items:center;justify-content:center;gap:6px}.btn-outline-custom:hover{background:var(--color-primary-light);border-color:var(--color-primary-hover);color:var(--color-primary-hover)}.btn-ghost-custom{background:transparent;color:var(--color-text-secondary);border:none;border-radius:8px;padding:8px 12px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s var(--transition-default);display:inline-flex;align-items:center;gap:6px}.btn-ghost-custom:hover{background:var(--color-border-light);color:var(--color-text-primary)}.btn-lg-custom{padding:14px 32px;font-size:16px;border-radius:var(--radius-button)}.card-ios{background:var(--color-bg);border-radius:var(--radius-card);box-shadow:var(--shadow-card);border:1px solid var(--color-border-light);transition:all .3s var(--transition-default);overflow:hidden}.card-ios:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}.input-ios{width:100%;padding:12px 16px;border:1.5px solid var(--color-border);border-radius:var(--radius-input);font-size:14px;font-family:var(--font-family);color:var(--color-text-primary);background:var(--color-bg);transition:all .2s var(--transition-default);outline:none}.input-ios::placeholder{color:var(--color-text-placeholder)}.input-ios:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #4a9eff1f}.input-ios:disabled{background:var(--color-border-light);cursor:not-allowed}.toast-container{position:fixed;top:80px;left:50%;transform:translate(-50%);z-index:9999;display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none}.toast-item{background:var(--color-bg);border-radius:12px;box-shadow:var(--shadow-toast);padding:12px 24px;font-size:14px;font-weight:500;color:var(--color-text-primary);white-space:nowrap;pointer-events:auto;max-height:0;opacity:0;overflow:hidden;transition:max-height .35s var(--transition-default),opacity .35s var(--transition-default),margin .35s var(--transition-default),padding .35s var(--transition-default);margin-top:0}.toast-item.toast-enter{max-height:60px;opacity:1;margin-top:0}.toast-item.toast-exit{max-height:0;opacity:0;margin-top:-8px}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000073;z-index:2000;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s var(--transition-default)}.modal-overlay.modal-visible{opacity:1}.modal-content-box{background:var(--color-bg);border-radius:var(--radius-modal);box-shadow:var(--shadow-modal);width:90%;max-width:420px;max-height:85vh;overflow-y:auto;transform:scale(.95) translateY(10px);transition:transform .3s var(--transition-default)}.modal-overlay.modal-visible .modal-content-box{transform:scale(1) translateY(0)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px 0}.modal-header h3{font-size:18px;font-weight:600;color:var(--color-text-primary);margin:0}.modal-close-btn{background:none;border:none;color:var(--color-text-placeholder);font-size:20px;cursor:pointer;padding:4px;border-radius:8px;transition:all .2s var(--transition-default);line-height:1}.modal-close-btn:hover{background:var(--color-border-light);color:var(--color-text-primary)}.modal-body{padding:20px 24px}.modal-footer{display:flex;gap:10px;justify-content:flex-end;padding:0 24px 20px}.login-modal-body{padding:32px 24px 24px;text-align:center}.login-modal-logo{width:56px;height:56px;margin:0 auto 16px;border-radius:14px;object-fit:contain}.login-modal-title{font-size:20px;font-weight:600;color:var(--color-text-primary);margin-bottom:24px}.login-modal-buttons{display:flex;flex-direction:column;gap:12px}.login-oauth-btn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:14px 20px;border:none;border-radius:var(--radius-button);font-size:15px;font-weight:500;cursor:pointer;transition:all .25s var(--transition-default);font-family:var(--font-family)}.login-oauth-btn:hover{transform:translateY(-1px)}.login-oauth-btn:active{transform:translateY(0)}.login-oauth-btn.btn-qq{background:#12b7f5;color:#fff;box-shadow:0 2px 8px #12b7f54d}.login-oauth-btn.btn-qq:hover{background:#0da6e0;box-shadow:0 4px 16px #12b7f566}.login-oauth-btn.btn-wechat{background:#07c160;color:#fff;box-shadow:0 2px 8px #07c1604d}.login-oauth-btn.btn-wechat:hover{background:#06ae56;box-shadow:0 4px 16px #07c16066}.login-oauth-btn.btn-alipay{background:#1677ff;color:#fff;box-shadow:0 2px 8px #1677ff4d}.login-oauth-btn.btn-alipay:hover{background:#1268e0;box-shadow:0 4px 16px #1677ff66}.login-modal-footer{margin-top:20px;font-size:12px;color:var(--color-text-placeholder)}.user-dropdown{position:relative}.user-dropdown-trigger{display:flex;align-items:center;gap:8px;padding:6px 12px;border-radius:10px;cursor:pointer;transition:background .2s var(--transition-default);border:none;background:none;font-family:var(--font-family)}.user-dropdown-trigger:hover{background:var(--color-border-light)}.user-dropdown-avatar{width:32px;height:32px;border-radius:50%;object-fit:cover;background:var(--color-primary-light);display:flex;align-items:center;justify-content:center;color:var(--color-primary);font-weight:600;font-size:14px}.user-dropdown-avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover}.user-dropdown-name{font-size:14px;font-weight:500;color:var(--color-text-primary);max-width:100px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-dropdown-menu{position:absolute;top:calc(100% + 6px);right:0;background:var(--color-bg);border-radius:var(--radius-card);box-shadow:var(--shadow-modal);border:1px solid var(--color-border-light);min-width:160px;padding:6px;opacity:0;transform:translateY(-4px) scale(.98);pointer-events:none;transition:all .2s var(--transition-default);z-index:1100}.user-dropdown-menu.dropdown-open{opacity:1;transform:translateY(0) scale(1);pointer-events:auto}.user-dropdown-item{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:10px;font-size:14px;color:var(--color-text-primary);cursor:pointer;transition:background .15s var(--transition-default);text-decoration:none;border:none;background:none;width:100%;font-family:var(--font-family)}.user-dropdown-item:hover{background:var(--color-primary-lighter);color:var(--color-primary)}.user-dropdown-item.danger{color:var(--color-danger)}.user-dropdown-item.danger:hover{background:#ff6b6b0f}.pagination-wrapper{display:flex;align-items:center;justify-content:center;gap:6px;padding:20px 0}.pagination-btn{min-width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:10px;border:1.5px solid var(--color-border);background:var(--color-bg);color:var(--color-text-primary);font-size:14px;font-weight:500;cursor:pointer;transition:all .2s var(--transition-default);font-family:var(--font-family)}.pagination-btn:hover:not(.active):not(:disabled){border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-lighter)}.pagination-btn.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff;box-shadow:var(--shadow-button)}.pagination-btn:disabled{background:var(--color-border-light);color:var(--color-text-placeholder);cursor:not-allowed;border-color:var(--color-border)}.loading-wrapper{display:flex;align-items:center;justify-content:center;padding:60px 0}.loading-spinner{width:36px;height:36px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.topic-card{cursor:pointer}.topic-card-cover{width:100%;aspect-ratio:16 / 10;object-fit:cover;border-radius:var(--radius-card) var(--radius-card) 0 0}.topic-card-body{padding:14px 16px 16px}.topic-card-title{font-size:15px;font-weight:600;color:var(--color-text-primary);margin-bottom:6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topic-card-author{font-size:12px;color:var(--color-text-secondary);margin-bottom:8px}.topic-card-footer{display:flex;align-items:center;justify-content:space-between}.topic-card-price{font-size:16px;font-weight:600;color:var(--color-primary)}.topic-card-price.free{color:var(--color-success)}.topic-card-rating{display:flex;align-items:center;gap:4px;font-size:12px;color:var(--color-text-secondary)}.topic-card-rating i{color:#fcc419;font-size:12px}.hero-section{text-align:center;padding:48px 24px 32px}.hero-section h1{font-size:32px;font-weight:700;color:var(--color-text-primary);margin-bottom:12px}.hero-section p{font-size:16px;color:var(--color-text-secondary);max-width:500px;margin:0 auto}.filter-bar{display:flex;align-items:center;justify-content:center;gap:8px;padding:0 24px 24px;flex-wrap:wrap}.filter-btn{padding:8px 20px;border-radius:20px;border:1.5px solid var(--color-border);background:var(--color-bg);color:var(--color-text-secondary);font-size:14px;font-weight:500;cursor:pointer;transition:all .2s var(--transition-default);font-family:var(--font-family)}.filter-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.filter-btn.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff;box-shadow:var(--shadow-button)}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;max-width:1200px;margin:0 auto;padding:0 24px}.topic-detail-page{max-width:900px;margin:0 auto;padding:0 24px}.topic-detail-cover{width:100%;aspect-ratio:16 / 9;object-fit:cover;border-radius:var(--radius-card);box-shadow:var(--shadow-card);margin-bottom:24px}.topic-detail-info{margin-bottom:24px}.topic-detail-title{font-size:26px;font-weight:700;color:var(--color-text-primary);margin-bottom:10px}.topic-detail-meta{display:flex;align-items:center;gap:16px;font-size:14px;color:var(--color-text-secondary);margin-bottom:16px;flex-wrap:wrap}.topic-detail-meta-item{display:flex;align-items:center;gap:5px}.topic-detail-price{font-size:28px;font-weight:700;color:var(--color-primary);margin-bottom:20px}.topic-detail-price.free{color:var(--color-success)}.topic-detail-description{font-size:15px;line-height:1.8;color:var(--color-text-primary);margin-bottom:24px}.topic-detail-actions,.topic-screenshots{margin-bottom:32px}.topic-screenshots h3{font-size:18px;font-weight:600;color:var(--color-text-primary);margin-bottom:16px}.topic-screenshots-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}.topic-screenshot-img{width:100%;aspect-ratio:16 / 10;object-fit:cover;border-radius:12px;box-shadow:var(--shadow-card);cursor:pointer;transition:all .3s var(--transition-default)}.topic-screenshot-img:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}.auth-page{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - var(--header-height) - 120px);padding:24px}.auth-card{width:100%;max-width:420px;background:var(--color-bg);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:40px 32px 32px;text-align:center}.auth-card-logo{width:56px;height:56px;margin:0 auto 20px;border-radius:14px;object-fit:contain}.auth-card h2{font-size:22px;font-weight:600;color:var(--color-text-primary);margin-bottom:6px}.auth-card p{font-size:14px;color:var(--color-text-secondary);margin-bottom:24px}.auth-form{text-align:left;margin-bottom:20px}.auth-form-group{margin-bottom:14px}.auth-form-group label{display:block;font-size:13px;font-weight:500;color:var(--color-text-primary);margin-bottom:6px}.auth-form-submit{width:100%;margin-top:6px}.auth-divider{display:flex;align-items:center;gap:12px;margin:20px 0;font-size:13px;color:var(--color-text-placeholder)}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--color-border)}.auth-switch{margin-top:16px;font-size:13px;color:var(--color-text-secondary)}.auth-switch a{font-weight:500}.user-center-page{max-width:800px;margin:0 auto;padding:0 24px}.user-center-header{display:flex;align-items:center;gap:20px;margin-bottom:32px;padding:24px;background:var(--color-bg);border-radius:var(--radius-card);box-shadow:var(--shadow-card)}.user-center-avatar{width:72px;height:72px;border-radius:50%;object-fit:cover;background:var(--color-primary-light);flex-shrink:0;overflow:hidden;display:flex;align-items:center;justify-content:center}.user-center-avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover}.user-center-avatar i{font-size:32px;color:var(--color-primary)}.user-center-name{font-size:22px;font-weight:600;color:var(--color-text-primary)}.user-center-email{font-size:14px;color:var(--color-text-secondary);margin-top:2px}.user-center-section{background:var(--color-bg);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:24px;margin-bottom:20px}.user-center-section h3{font-size:17px;font-weight:600;color:var(--color-text-primary);margin-bottom:18px;padding-bottom:12px;border-bottom:1px solid var(--color-border-light)}.user-bind-item{display:flex;align-items:center;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--color-border-light)}.user-bind-item:last-child{border-bottom:none;padding-bottom:0}.user-bind-info{display:flex;align-items:center;gap:12px}.user-bind-icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff}.user-bind-icon.qq{background:#12b7f5}.user-bind-icon.wechat{background:#07c160}.user-bind-icon.alipay{background:#1677ff}.user-bind-label{font-size:14px;font-weight:500;color:var(--color-text-primary)}.user-bind-status{font-size:12px;color:var(--color-text-secondary);margin-top:2px}.orders-page{max-width:900px;margin:0 auto;padding:0 24px}.orders-page h2{font-size:22px;font-weight:600;color:var(--color-text-primary);margin-bottom:20px}.order-item{background:var(--color-bg);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:18px 20px;margin-bottom:14px;transition:all .2s var(--transition-default)}.order-item:hover{box-shadow:var(--shadow-card-hover)}.order-item-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.order-item-id{font-size:13px;color:var(--color-text-secondary)}.order-status-badge{padding:4px 12px;border-radius:20px;font-size:12px;font-weight:500}.order-status-badge.pending{background:#fcc4191f;color:#d4a017}.order-status-badge.paid{background:#51cf661f;color:#2f9e48}.order-status-badge.cancelled{background:#6c757d1f;color:#6c757d}.order-status-badge.refunded{background:#ff6b6b1f;color:#e03131}.order-item-body{display:flex;align-items:center;gap:14px}.order-item-cover{width:60px;height:60px;border-radius:10px;object-fit:cover;background:var(--color-border-light);flex-shrink:0}.order-item-info{flex:1}.order-item-title{font-size:15px;font-weight:500;color:var(--color-text-primary);margin-bottom:4px}.order-item-meta{font-size:12px;color:var(--color-text-secondary)}.order-item-price{font-size:16px;font-weight:600;color:var(--color-primary)}.payment-result-page{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - var(--header-height) - 120px);padding:24px}.payment-result-card{text-align:center;background:var(--color-bg);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:48px 40px;max-width:420px;width:100%}.payment-result-icon{width:72px;height:72px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;font-size:32px}.payment-result-icon.success{background:#51cf661f;color:#2f9e48}.payment-result-icon.fail{background:#ff6b6b1f;color:#e03131}.payment-result-card h2{font-size:22px;font-weight:600;color:var(--color-text-primary);margin-bottom:8px}.payment-result-card p{font-size:14px;color:var(--color-text-secondary);margin-bottom:28px}.payment-result-actions{display:flex;gap:12px;justify-content:center}.footer{background:var(--color-bg);border-top:1px solid var(--color-border-light);padding:24px;text-align:center;margin-top:auto}.footer-inner{max-width:1200px;margin:0 auto}.footer-links{display:flex;align-items:center;justify-content:center;gap:20px;margin-bottom:12px}.footer-links a{font-size:13px;color:var(--color-text-secondary);transition:color .2s var(--transition-default)}.footer-links a:hover{color:var(--color-primary)}.footer-copyright{font-size:12px;color:var(--color-text-placeholder)}@media (max-width: 768px){.hero-section h1{font-size:24px}.topic-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}.header-nav-links{gap:2px}.header-nav-links a{padding:6px 10px;font-size:13px}.user-dropdown-name{display:none}.topic-detail-title{font-size:20px}.topic-detail-price{font-size:22px}.user-center-header{flex-direction:column;text-align:center}.user-center-avatar{width:64px;height:64px}.order-item-body{flex-wrap:wrap}}@media (max-width: 480px){.topic-grid{grid-template-columns:1fr}.hero-section{padding:32px 16px 20px}.auth-card{padding:32px 20px 24px}.payment-result-actions{flex-direction:column}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--color-text-placeholder)}.empty-state{text-align:center;padding:60px 24px;color:var(--color-text-secondary)}.empty-state i{font-size:48px;color:var(--color-border);margin-bottom:16px;display:block}.empty-state p{font-size:15px}.text-primary-custom{color:var(--color-primary)!important}.text-secondary-custom{color:var(--color-text-secondary)!important}.bg-primary-light{background:var(--color-primary-light)!important}.mt-20{margin-top:20px}.mb-20{margin-bottom:20px}