:root{color-scheme:light dark;--bg-body: #f5f5f7;--bg-elevated: #ffffff;--bg-subtle: #f0f0f2;--text-primary: #111111;--text-secondary: #555555;--text-muted: #757575;--text-on-accent: #ffffff;--border-subtle: #e0e0e4;--border-strong: #c6c6cc;--accent: #20b2aa;--accent-hover: #1a9b95;--accent-soft: rgba(32, 178, 170, .08);--danger-soft: rgba(230, 57, 70, .08);--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;--text-xs: .75rem;--text-sm: .875rem;--text-md: 1rem;--text-lg: 1.125rem;--text-xl: 1.5rem;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--sidebar-width: 240px;--content-max-width: 860px;--shadow-soft: 0 8px 24px rgba(15, 23, 42, .08)}:root[data-theme=dark]{--bg-body: #0f172a;--bg-elevated: #1e293b;--bg-subtle: #334155;--text-primary: #f1f5f9;--text-secondary: #cbd5e1;--text-muted: #94a3b8;--border-subtle: #334155;--border-strong: #475569}:root[data-theme=light]{--bg-body: #f5f5f7;--bg-elevated: #ffffff;--bg-subtle: #f0f0f2;--text-primary: #111111;--text-secondary: #555555;--text-muted: #757575;--border-subtle: #e0e0e4;--border-strong: #c6c6cc}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;font-family:var(--font-sans)}body{background:var(--bg-body);color:var(--text-primary)}.pg-header{position:sticky;top:0;z-index:40;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffe6;border-bottom:1px solid var(--border-subtle)}:root[data-theme=dark] .pg-header{background:#262e3a}.pg-header__inner{max-width:var(--content-max-width);margin:0 auto;padding:10px 16px;display:flex;align-items:center;justify-content:space-between}.pg-header__right{margin-left:auto;display:flex;align-items:center;gap:8px}.pg-header__theme{display:flex;gap:4px}.pg-header__donate{border-color:#20b2aab3}.pg-header__login{background:#111;color:#fff;border-color:#111}:root[data-theme=dark] .pg-header__login{background:var(--accent);color:#fff;border-color:var(--accent)}.pg-main{flex:1}.app{min-height:100vh;display:flex;background:transparent}.app__main{flex:1;display:flex;flex-direction:column;align-items:stretch;padding:24px 32px}.app__sidebar{width:var(--sidebar-width);padding:20px 18px;border-right:1px solid var(--border-subtle);background:#ffffffb3;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);display:flex;flex-direction:column;gap:16px;z-index:1}:root[data-theme=dark] .app__sidebar{background:#1e293bb3}.app__logo{display:flex;align-items:center;gap:8px;margin-bottom:8px;cursor:pointer}.app__logo-mark{width:26px;height:26px;border-radius:10px;background:radial-gradient(circle at 20% 0,#fff 0,#20b2aa 40%,teal);box-shadow:0 12px 30px #00000026}.app__logo-text{font-size:var(--text-md);font-weight:600;letter-spacing:.03em}.app__tagline{font-size:var(--text-xs);color:var(--text-muted)}.app__sidebar-section-title{font-size:var(--text-xs);font-weight:500;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin-bottom:4px}.app__sidebar-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:4px}.app__sidebar-item{font-size:var(--text-sm);padding:6px 10px;border-radius:10px;color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;gap:8px;border:1px solid transparent;transition:background .15s ease,border-color .15s ease,color .15s ease,transform .1s ease}.app__sidebar-item:hover{background:var(--accent-soft);border-color:#20b2aa59;color:var(--text-primary);transform:translateY(-1px)}.app__sidebar-item--active{background:var(--bg-elevated);border-color:var(--border-strong);color:var(--text-primary)}.btn-pill{font-size:var(--text-xs);padding:6px 10px;border-radius:999px;border:1px solid var(--border-subtle);background:#fffc;color:var(--text-secondary);cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:background .15s ease,border-color .15s ease,box-shadow .15s ease,transform .08s ease}.btn-pill:hover{background:var(--bg-elevated);border-color:var(--border-strong);box-shadow:0 8px 20px #0f172a0f;transform:translateY(-.5px)}.btn-pill--active{border-color:#20b2aab3;color:var(--text-primary);background:var(--accent-soft)}:root[data-theme=dark] .btn-pill{background:#1e293bcc;color:var(--text-secondary)}:root[data-theme=dark] .btn-pill:hover{background:var(--bg-elevated)}.icon-button{width:32px;height:32px;border-radius:999px;border:1px solid transparent;background:transparent;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-muted);transition:background .15s ease,border-color .15s ease,color .15s ease,transform .08s ease}.icon-button:hover{background:var(--bg-subtle);border-color:var(--border-subtle);color:var(--text-secondary);transform:translateY(-.5px)}.btn-send{width:34px;height:34px;border-radius:999px;border:none;background:linear-gradient(135deg,var(--accent),#008080);display:inline-flex;align-items:center;justify-content:center;color:var(--text-on-accent);cursor:pointer;box-shadow:0 12px 28px #20b2aa80;transition:transform .08s ease,box-shadow .15s ease,filter .15s ease,opacity .08s ease}.btn-send:hover{transform:translateY(-1px);box-shadow:0 16px 36px #20b2aaa6;filter:brightness(1.02)}.btn-send:disabled{cursor:default;opacity:.6;box-shadow:none}.chat{flex:1;display:flex;flex-direction:column;position:relative;overflow:hidden;min-height:0}.chat__scroll{flex:1;overflow-y:auto;padding:12px 0 18px;display:flex;justify-content:center}.chat__inner{width:100%;max-width:var(--content-max-width)}.chat__scroll::-webkit-scrollbar{width:8px}.chat__scroll::-webkit-scrollbar-track{background:transparent}.chat__scroll::-webkit-scrollbar-thumb{background:#0f172a26;border-radius:999px}:root[data-theme=dark] .chat__scroll::-webkit-scrollbar-thumb{background:#94a3b84d}.chat-output{flex:0 1 auto;display:flex;overflow-y:auto;padding:20px 20px 0;min-height:0}.chat-output__inner{width:100%;max-width:var(--content-max-width);margin:0 auto;padding-bottom:20px}.chat-output__row{display:flex!important;align-items:flex-start;gap:10px;margin-bottom:16px}.chat-output__row--user{justify-content:flex-end}.chat-output__row--assistant{justify-content:flex-start}.chat-output__avatar{flex-shrink:0;width:26px;height:26px;border-radius:999px;background:#111;color:#fff;font-size:.7rem;font-weight:600;display:flex;align-items:center;justify-content:center}.chat-output__row--assistant .chat-output__avatar{background:radial-gradient(circle at 20% 0,#fff 0,#20b2aa 35%,teal)}.chat-output__bubble{max-width:80%;border-radius:18px;padding:12px 16px;font-size:var(--text-md);border:1px solid var(--border-subtle);background:#fffffff2;box-shadow:0 2px 12px #00000014}.chat-output__row--assistant .chat-output__bubble{background:#fffffff2;border-color:var(--border-subtle)}.chat-output__row--user .chat-output__bubble{background:#111827;color:#e5e7eb;border-color:transparent;margin-left:auto}:root[data-theme=dark] .chat-output__row--assistant .chat-output__bubble{background:#1e293bf2;color:var(--text-primary)}:root[data-theme=dark] .chat-output__row--user .chat-output__bubble{background:var(--accent);color:#fff}.chat-output__meta{display:flex;align-items:center;gap:8px;margin-bottom:6px;font-size:var(--text-xs)}.chat-output__author{font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em}.chat-output__row--user .chat-output__author{color:#9ca3af}.chat-output__time{color:var(--text-muted)}.chat-output__content p{margin:0 0 .4em}.chat-output__content p:last-child{margin-bottom:0}.chat-output__bubble--streaming{display:flex;align-items:center;justify-content:flex-start;min-height:20px}.chat-output__dots{display:flex;gap:4px}.chat-output__dots span{width:6px;height:6px;border-radius:50%;background:var(--text-muted);animation:chatDots 1.4s infinite ease-in-out}.chat-output__dots span:nth-child(2){animation-delay:.2s}.chat-output__dots span:nth-child(3){animation-delay:.4s}@keyframes chatDots{0%,80%,to{transform:scale(.8);opacity:.5}40%{transform:scale(1);opacity:1}}.chat-output::-webkit-scrollbar{width:6px}.chat-output::-webkit-scrollbar-track{background:transparent}.chat-output::-webkit-scrollbar-thumb{background:#00000026;border-radius:3px}:root[data-theme=dark] .chat-output::-webkit-scrollbar-thumb{background:#94a3b84d}.chat-input-shell{position:sticky;bottom:0;left:0;right:0;width:100%;background:var(--bg-body);padding:18px 20px 20px;border-top:1px solid var(--border-subtle);z-index:10;flex-shrink:0}.chat-input{width:100%;max-width:var(--content-max-width);margin:0 auto;display:flex;flex-direction:column;gap:8px}.chat-input__box{position:static;border-radius:999px;background:#ffffffe6;border:1px solid var(--border-subtle);box-shadow:0 16px 35px #0f172a14;display:flex;align-items:center;padding:8px 8px 8px 14px;gap:10px;transition:box-shadow .15s ease,border-color .15s ease,transform .08s ease}:root[data-theme=dark] .chat-input__box{background:#1e293be6}.chat-input__box:focus-within{border-color:#20b2aa99;box-shadow:0 18px 40px #20b2aa2e;transform:translateY(-1px)}.chat-input__textarea{flex:1;border:none;outline:none;resize:none;background:transparent;font-family:var(--font-sans);font-size:var(--text-md);line-height:1.4;max-height:120px;padding:4px 0;color:var(--text-primary)}.chat-input__textarea::placeholder{color:var(--text-muted)}.chat-input__actions{display:flex;align-items:center;gap:6px}.chat-input__hint{font-size:var(--text-xs);color:var(--text-muted);display:flex;justify-content:space-between;align-items:center}.hero{padding:24px 22px 18px;background:linear-gradient(145deg,#ffffffd9,#f5f5faf2);border-radius:var(--radius-lg);border:1px solid var(--border-subtle);box-shadow:var(--shadow-soft);display:flex;flex-direction:column;gap:18px;margin-bottom:16px}:root[data-theme=dark] .hero{background:linear-gradient(145deg,#1e293bd9,#33415580)}.hero__title{font-size:1.5rem;letter-spacing:-.03em;font-weight:600}.hero__subtitle{font-size:var(--text-sm);color:var(--text-muted)}.hero__suggestions{display:flex;flex-wrap:wrap;gap:8px}.hero__chip{font-size:var(--text-sm);border-radius:999px;padding:8px 12px;border:1px solid var(--border-subtle);background:#ffffffe6;color:var(--text-secondary);cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:background .15s ease,border-color .15s ease,transform .08s ease,box-shadow .12s ease}.hero__chip:hover{background:var(--accent-soft);border-color:#20b2aa66;box-shadow:0 12px 25px #0f172a14;transform:translateY(-1px)}:root[data-theme=dark] .hero__chip{background:#1e293be6}.hero--compare{display:grid;max-width:1000px}.compare{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.compare__column{display:flex;flex-direction:column;gap:8px}.compare__label{font-size:var(--text-sm);font-weight:600;color:var(--text-secondary)}.compare__card{border-radius:16px;padding:10px 10px 12px;background:var(--bg-elevated);border:1px solid var(--border-subtle);display:flex;flex-direction:column;gap:8px}.compare__card--success{background:linear-gradient(135deg,#20b2aa14,#0080800a);border-color:#20b2aa66}.compare__image{width:100%;border-radius:12px;display:block}.compare__image-placeholder{width:100%;aspect-ratio:4 / 3;border-radius:12px;border:1px dashed rgba(32,178,170,.6);background:#ffffffe6;display:flex;align-items:center;justify-content:center}:root[data-theme=dark] .compare__image-placeholder{background:#1e293be6}.compare__emoji{font-size:2.2rem}.compare__caption{font-size:var(--text-xs);color:var(--text-muted)}.faq-page{width:100%;padding:32px 16px 48px}.faq-page__inner{max-width:var(--content-max-width);margin:0 auto}.faq-page__title{font-size:var(--text-xl);font-weight:600;margin-bottom:12px;letter-spacing:-.02em}.faq-page__intro{font-size:var(--text-md);color:var(--text-secondary);margin-bottom:32px;line-height:1.6}.faq-section{margin-bottom:40px}.faq-section__title{font-size:var(--text-lg);font-weight:600;margin-bottom:8px;color:var(--text-primary)}.faq-section__description{font-size:var(--text-sm);color:var(--text-secondary);margin-bottom:16px;line-height:1.5}.faq-list{display:flex;flex-direction:column;gap:8px}.faq-row{background:var(--bg-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden;transition:box-shadow .2s ease}.faq-row:hover{box-shadow:0 4px 12px #0f172a0d}:root[data-theme=dark] .faq-row:hover{box-shadow:0 4px 12px #0000004d}.faq-row__button{width:100%;padding:16px 18px;background:transparent;border:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;text-align:left;font-size:var(--text-md);transition:background .15s ease}.faq-row__button:hover{background:var(--bg-subtle)}.faq-row__question{font-weight:500;color:var(--text-primary);flex:1;padding-right:16px}.faq-row__icon{transition:transform .2s ease;color:var(--text-muted);font-size:1.2rem;flex-shrink:0}.faq-row__icon--open{transform:rotate(180deg)}.faq-row__answer{padding:0 18px 18px;color:var(--text-secondary);line-height:1.6;animation:fadeIn .2s ease}.faq-row__answer p{margin:0}.message__content p{margin:0 0 .4em}.message__content p:last-child{margin-bottom:0}.message__content code{font-family:JetBrains Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-size:.86em;padding:.12em .28em;border-radius:6px;background:#f0f0f4;color:#111}:root[data-theme=dark] .message__content code{background:#1e293b;color:#e2e8f0}.message__content pre{margin:.4em 0;padding:10px 12px;border-radius:12px;background:#111827;color:#e5e7eb;font-family:JetBrains Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-size:.86em;overflow-x:auto}.alert{border-radius:14px;padding:10px 12px;background:var(--danger-soft);border:1px solid rgba(230,57,70,.35);color:#7f1d1d;font-size:var(--text-sm)}:root[data-theme=dark] .alert{color:#fca5a5}.fade-in{animation:fadeIn .18s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(2px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:960px){.compare{grid-template-columns:1fr}.app{flex-direction:column}.app__sidebar{width:100%;flex-direction:row;align-items:center;justify-content:space-between;border-right:none;border-bottom:1px solid var(--border-subtle);gap:10px}.app__sidebar-section-title,.app__sidebar-list{display:none}.app__main{padding:16px 16px 22px}.hero{padding:18px 16px 14px}.chat{height:calc(100vh - 60px)}.chat-output{padding:16px 16px 0}.chat-input-shell{padding:14px 16px 16px}}@media(max-width:800px){.pg-header__inner{padding:8px 10px}.pg-header__right{gap:4px}.app__logo-mark{width:22px;height:22px}.app__logo-text{font-size:var(--text-xs)}.hero__title{font-size:1.35rem}}@media(max-width:600px){.pg-header{position:fixed;top:0;z-index:20;width:100%}.pg-header__inner{flex-wrap:wrap;row-gap:6px;padding:10px 16px}.pg-header__right{margin-left:auto}.app__logo-mark{width:20px;height:20px}.app__logo-text{font-size:var(--text-xs)}.hero__title{font-size:1.25rem}.chat-output{padding:80px 0 0}.chat-input-shell{padding:12px}.chat-input__box{padding:6px 6px 6px 12px;box-shadow:0 10px 28px #0f172a1f}.chat-input__textarea{font-size:16px}.faq-page{width:100%;padding:55px 16px 48px}}