:root{--bg:#fff;--surface:#f0f4f9;--surface-hover:#e9eef6;--surface-2:#fff;--primary:#b65437;--primary-dark:#8f3e25;--primary-bg:#b654371a;--text-main:#1f1f1f;--text-sub:#444746;--border:#e3e3e3;--user-bubble:#e8f0fe;--card-bg:#fff;--shadow:#00000014;--home-hero-bg:radial-gradient(circle at 7% 16%, #ff6e1c0e 0 1px, transparent 1.8px) 0 0/18px 18px, linear-gradient(180deg,#fffffff0,#faf7f1f5), radial-gradient(circle at top left, #ff802b11, transparent 34%), radial-gradient(circle at 88% 12%, #004f460e, transparent 30%), #fbf8f1;--premium-green:#063f3a;--success-green:#14ae5c;--error:#d93025;--pricing-green:#004f46;--pricing-green-2:#007060;--pricing-green-soft:#e7f3ef;--pricing-cream:#fbf8f1;--pricing-line:#dce3db;--admin-bg:#f7f5f2;--admin-surface:#fff;--admin-surface-2:#f0eee9;--admin-border:#e6e2db;--admin-text-sub:#5f5b57;--font-sans:"Google Sans", "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;--radius-sm:6px;--radius:10px;--radius-lg:16px;--radius-xl:24px;--shadow-sm:0 1px 3px #00000014;--shadow-md:0 4px 12px #00000014;--shadow-lg:0 10px 32px #0000001a;--shadow-xl:0 20px 60px #0000001f;--safe-bottom:env(safe-area-inset-bottom,0px)}:root[data-theme=dark]{--bg:#111412;--surface:#171c19;--surface-hover:#222923;--surface-2:#111412;--primary:#f28b58;--primary-bg:#f28b5826;--text-main:#f4f7f2;--text-sub:#b8c0b8;--border:#2b332d;--user-bubble:#0f6157;--card-bg:#171c19;--shadow:#0000004d;--home-hero-bg:radial-gradient(circle at 7% 16%, #f28b5814 0 1px, transparent 1.8px) 0 0/18px 18px, linear-gradient(180deg,#0d110ff2,#111412fa), radial-gradient(circle at top left, #f28b5813, transparent 34%), radial-gradient(circle at 88% 10%, #62c7ba11, transparent 30%), #111412}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{font-family:var(--font-sans);background:var(--bg);color:var(--text-main);-webkit-text-size-adjust:100%;margin:0;line-height:1.5;overflow-x:hidden}img{backface-visibility:hidden;max-width:100%;height:auto;transform:translateZ(0)}button{cursor:pointer;font-family:inherit}a{color:inherit;text-decoration:none}.route-transition-shell{animation:.36s cubic-bezier(.22,1,.36,1) both route-enter}.route-transition-shell section,.route-transition-shell .card,.route-transition-shell .home-showcase,.route-transition-shell .home-stats-grid,.route-transition-shell .dictionary-book-zone,.route-transition-shell .tp-layout,.route-transition-shell .tp-below-fold{animation:.52s cubic-bezier(.22,1,.36,1) both content-rise}.route-transition-shell section:nth-of-type(2),.route-transition-shell .home-showcase,.route-transition-shell .tp-below-fold{animation-delay:70ms}.route-transition-shell section:nth-of-type(3),.route-transition-shell .home-stats-grid{animation-delay:.13s}.card,.btn,.nav-link,button,a,.home-feature-card,.home-preview-card,.home-cta-card{transition:transform .18s cubic-bezier(.22,1,.36,1),box-shadow .18s cubic-bezier(.22,1,.36,1),background-color .18s,border-color .18s,color .18s,opacity .18s}.card:hover,.home-feature-card:hover,.home-preview-card:hover,.home-cta-card:hover{transform:translateY(-2px)}.btn:hover:not(:disabled){transform:translateY(-1px)}@keyframes route-enter{0%{opacity:0;filter:blur(2px);transform:translateY(10px)}to{opacity:1;filter:blur();transform:translateY(0)}}@keyframes content-rise{0%{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}.page-layout{flex-direction:column;min-height:100dvh;display:flex}.page-main{flex:1}.container{width:100%;max-width:1320px;margin:0 auto;padding:0 24px}.container-sm{width:100%;max-width:860px;margin:0 auto;padding:0 24px}h1,h2,h3,h4,h5,h6{letter-spacing:-.01em;margin:0;line-height:1.2}p{margin:0;line-height:1.6}.btn{border-radius:var(--radius);cursor:pointer;white-space:nowrap;border:none;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-family:inherit;font-size:14px;font-weight:600;text-decoration:none;transition:all .18s;display:inline-flex}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 14px #b6543747}.btn-primary:hover:not(:disabled){background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 20px #b654375c}.btn-outline{color:var(--text-main);border:1px solid var(--border);background:0 0}.btn-outline:hover:not(:disabled){background:var(--surface);border-color:var(--text-sub)}.btn-ghost{color:var(--text-sub);background:0 0;border:none}.btn-ghost:hover:not(:disabled){background:var(--surface);color:var(--text-main)}.btn-sm{padding:7px 14px;font-size:13px}.btn-lg{border-radius:12px;padding:14px 28px;font-size:16px}.btn-premium{background:var(--premium-green);color:#fff;box-shadow:0 4px 14px #063f3a47}.btn-premium:hover:not(:disabled){background:#074e48;transform:translateY(-1px)}.card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}.badge{text-transform:uppercase;letter-spacing:.04em;border-radius:999px;align-items:center;gap:4px;padding:3px 10px;font-size:11px;font-weight:700;display:inline-flex}.badge-primary{background:var(--primary-bg);color:var(--primary);border:1px solid #b6543733}.badge-success{color:#047857;background:#14ae5c1a;border:1px solid #14ae5c33}.badge-premium{background:var(--premium-green);color:#fff}.badge-warning{color:#c2410c;background:#fff7ed;border:1px solid #fed7aa}.form-field{flex-direction:column;gap:6px;display:flex}.form-label{color:var(--text-sub);font-size:13px;font-weight:600}.form-input,.form-select,.form-textarea{border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text-main);background:var(--card-bg);padding:10px 14px;font-family:inherit;font-size:14px;transition:border-color .18s,box-shadow .18s}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-bg);outline:none}.form-textarea{resize:vertical;min-height:100px;line-height:1.5}.skeleton{background:linear-gradient(90deg, var(--surface) 0%, var(--surface-2) 50%, var(--surface) 100%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.2s ease-in-out infinite skeleton-sheen}@keyframes skeleton-sheen{0%{background-position:140% 0}to{background-position:-80% 0}}.toggle-switch{flex-shrink:0;width:48px;height:28px;position:relative}.toggle-switch input{opacity:0;width:0;height:0;position:absolute}.toggle-slider{cursor:pointer;background:#d1d5db;border-radius:999px;transition:background 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pop-up;overflow-y:auto}.app-header-inner{justify-content:space-between;gap:clamp(16px,2.4vw,34px);min-width:0}.app-header-logo{flex:0 auto;min-width:0}.app-header-logo img{width:clamp(156px,18vw,192px)!important}.app-header-nav{flex:auto;justify-content:center;align-items:center;gap:clamp(14px,1.8vw,28px);min-width:0;display:flex}.app-header-actions{flex:none;align-items:center;gap:12px;display:flex}@media (width<=1120px){.app-header-profile-text{display:none}.app-header-actions .btn-primary{padding-left:14px;padding-right:14px;min-width:0!important}}@media (width<=980px){.container.app-header-inner{width:100vw;max-width:none;margin:0}.app-header-nav.hide-mobile,.app-header-actions.hide-mobile{display:none!important}.hide-desktop{display:flex!important}}@media (width<=768px){.app-header-inner{gap:12px;height:68px!important}.app-header-logo img{width:clamp(148px,45vw,184px)!important}.home-hero-mark,.home-hero-dotfield{opacity:.045}.home-search-sample{border-radius:0 0 14px 14px;padding:14px 16px 16px}.home-search-sample button{grid-template-columns:1fr!important;gap:2px!important}.home-popular-row{flex-wrap:nowrap;justify-content:flex-start;padding-bottom:6px;overflow-x:auto}.home-popular-row>span,.home-popular-row>button{flex:none}.container,.container-sm{padding:0 16px}.hide-mobile{display:none!important}}@media (width>=981px){.hide-desktop{display:none!important}}.fade-img{opacity:0;transition:opacity .28s}.fade-img.loaded{opacity:1}.theme-logo-dark,:root[data-theme=dark] .theme-logo-light{display:none}:root[data-theme=dark] .theme-logo-dark{display:block}.status-dot{background:#d1d5db;border-radius:50%;width:8px;height:8px;display:inline-block}.status-dot.green{background:var(--success-green);box-shadow:0 0 0 2px #14ae5c33}.status-dot.red{background:var(--error)}.spinner{border:2px solid #b6543733;border-top-color:var(--primary);border-radius:50%;flex-shrink:0;width:18px;height:18px;animation:.75s linear infinite 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a{width:100%;color:var(--text-main);text-align:left;border-radius:8px;align-items:center;gap:14px;padding:13px 16px;font-size:15px;font-weight:700;text-decoration:none;display:flex}.settings-nav a.active{color:var(--primary);background:var(--primary-bg)}.settings-premium-card{background:linear-gradient(135deg,#14ae5c1a,#0000);margin-top:34px;padding:22px}.settings-premium-card>div{color:var(--success-green);align-items:center;gap:8px;margin-bottom:8px;font-weight:900;display:flex}.settings-premium-card p{color:var(--text-sub);margin-bottom:16px;font-size:13px}.settings-main{min-width:0}.settings-heading{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:26px;display:flex}.settings-heading h2{color:var(--text-main);margin-bottom:6px;font-size:28px;font-weight:900}.settings-heading p{color:var(--text-sub);font-size:15px}.settings-notice{max-width:360px;color:var(--text-main);background:#14ae5c14;border:1px solid #14ae5c38;border-radius:8px;padding:10px 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var(--border);justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:8px;padding:2px 2px 10px;display:flex}.home-chat-history-head strong{color:var(--text-main);font-size:14px;display:block}.home-chat-history-head span,.home-chat-history-empty{color:var(--text-sub);font-size:12px}.home-chat-history-head button{border:1px solid var(--border);background:var(--surface);width:28px;height:28px;color:var(--text-sub);border-radius:7px;place-items:center;display:grid}.home-chat-history-list{gap:6px;display:grid}.home-chat-history-list button{width:100%;color:var(--text-main);text-align:left;background:0 0;border:0;border-radius:8px;grid-template-columns:16px minmax(0,1fr);align-items:center;gap:8px;padding:9px 8px;font-size:13px;font-weight:750;display:grid}.home-chat-history-list button:hover{background:var(--surface)}.home-chat-history-list span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.home-chat-history-empty{text-align:center;padding:18px 8px}.home-chat-history-actions{grid-template-columns:1fr 1fr;gap:8px;margin-top:10px;display:grid}.home-chat-history-clear,.home-chat-history-more{border:1px solid var(--border);background:var(--surface);border-radius:8px;justify-content:center;align-items:center;gap:7px;width:100%;padding:9px 10px;font-size:13px;font-weight:800;display:inline-flex}.home-chat-history-clear{color:var(--error)}.home-chat-history-more{color:var(--primary);text-decoration:none}@media (width<=1024px){.home-showcase,.about-hero{grid-template-columns:1fr!important}.home-stats-grid{grid-template-columns:repeat(3,minmax(140px,1fr))}.about-card-grid,.about-stats-strip,.about-timeline{grid-template-columns:repeat(2,1fr)}.about-book-card{grid-template-columns:140px 1fr!important}.settings-shell{grid-template-columns:1fr}.settings-side{border-right:none;padding-right:0}.settings-nav{flex-wrap:wrap;gap:8px;display:flex}.settings-nav a{border:1px solid var(--border);background:var(--surface);flex:150px;justify-content:flex-start;padding:10px 12px}.settings-heading{flex-direction:column}.settings-notice{width:100%;max-width:none}.dashboard-layout{grid-template-columns:1fr}}@media (width<=640px){.home-showcase>div:last-child,.home-feature-grid,.home-stats-grid,.about-card-grid,.about-stats-strip,.about-timeline,.about-book-card,.settings-card-grid{grid-template-columns:1fr!important}.home-preview-card,.home-feature-card{padding:20px!important}.settings-card{grid-template-columns:1fr}.settings-nav a{flex-basis:calc(50% - 8px);gap:8px;font-size:13px}.settings-row,.settings-metric-row{flex-direction:column;align-items:flex-start}.home-results-search-section{padding:10px 14px calc(10px + env(safe-area-inset-bottom,0px))}.home-chat-active{height:calc(100dvh - 70px)}.home-chat-results-section{height:auto;padding:18px 14px 96px}.home-chat-search-shell{grid-template-columns:44px minmax(0,1fr);gap:8px}.home-chat-history-btn{justify-content:center;width:44px;height:44px;min-height:44px;padding:0}.home-chat-history-btn span{display:none}.home-chat-history-panel{width:min(320px,100vw - 28px);left:0}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}