:root{--bg:#ffffff;--surface:#ffffff;--surface-secondary:#f8f8f8;--border:#e6eaf0;--border-strong:#bbbbbb;--border-control:#d0d4db;--border-focus:#2563eb;--text-primary:#111827;--text-secondary:#4b5563;--text-muted:#767676;--text-placeholder:#9ca3af;--text-muted-on-surface:#575757;--accent:#2563eb;--accent-light:#eff6ff;--accent-hover:#1d4ed8;--success:#15803d;--success-bg:#f0fdf4;--error:#b42318;--error-bg:#fef3f2;--font-body:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--text-xs:0.75rem;--text-sm:0.875rem;--form-option-font-size:14px;--text-base:1rem;--text-md:1.125rem;--text-lg:1.25rem;--text-xl:1.5rem;--text-2xl:1.875rem;--text-3xl:2.25rem;--text-4xl:3rem;--line-height-solid:1;--line-height-tight:1.25;--line-height-snug:1.375;--line-height-normal:1.5;--line-height-relaxed:1.6;--line-height-loose:1.75;--radius:12px;--radius-sm:8px;--radius-lg:16px;--radius-xl:20px;--radius-pill:9999px;--shadow-sm:0 1px 3px rgba(0, 0, 0, 0.06),0 1px 2px rgba(0, 0, 0, 0.04);--shadow-md:0 4px 16px rgba(0, 0, 0, 0.07),0 1px 4px rgba(0, 0, 0, 0.04);--transition:0.1s ease}*,::after,::before{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{background:var(--bg);color:var(--text-primary);font-family:var(--font-body);line-height:var(--line-height-relaxed);-webkit-font-smoothing:antialiased;min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:720px;margin:0 auto;padding:0 24px}.container--wide{max-width:900px;margin:0 auto;padding:0 24px}.site-header{border-bottom:1px solid var(--border);background:var(--surface);padding:16px 0;position:relative;z-index:100}.site-header__inner{display:flex;align-items:center;max-width:900px;margin:0 auto;padding:0 24px;gap:24px;position:relative}.site-header__logo{height:40px;width:auto;display:block;vertical-align:middle}.site-header__badge{position:absolute;left:50%;transform:translateX(-50%);font-size:var(--text-sm);color:var(--text-muted);pointer-events:none}.site-nav{display:flex;align-items:center;gap:4px;margin-left:auto}.site-nav__link{display:inline-flex;align-items:center;padding:7px 12px;font-size:var(--text-sm);font-weight:500;font-family:var(--font-body);color:var(--text-secondary);background:0 0;border-radius:var(--radius);text-decoration:none;transition:background var(--transition),color var(--transition)}.site-nav__link--active,.site-nav__link:focus-visible,.site-nav__link:hover{background:var(--surface-secondary);color:var(--text-primary);text-decoration:none;outline:0}.nav-dropdown{position:relative}.nav-dropdown__trigger{display:inline-flex;align-items:center;gap:5px;padding:7px 12px;font-size:var(--text-sm);font-weight:500;font-family:var(--font-body);color:var(--text-secondary);background:0 0;border:none;border-radius:var(--radius);cursor:pointer;transition:background var(--transition),color var(--transition)}.nav-dropdown[data-open] .nav-dropdown__trigger,.nav-dropdown__trigger:focus-visible,.nav-dropdown__trigger:hover{background:var(--surface-secondary);color:var(--text-primary);outline:0}.nav-dropdown__chevron{transition:transform var(--transition);color:inherit}.nav-dropdown[data-open] .nav-dropdown__chevron{transform:rotate(180deg)}.nav-dropdown__menu{display:none;position:absolute;top:calc(100% + 6px);left:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-md);min-width:210px;padding:6px;z-index:200}.nav-dropdown[data-open] .nav-dropdown__menu{display:block}.nav-dropdown__item{display:flex;align-items:center;justify-content:space-between;padding:8px 10px;font-size:var(--text-sm);color:var(--text-secondary);border-radius:8px;transition:background var(--transition),color var(--transition);text-decoration:none}.nav-dropdown__item:hover{background:var(--surface-secondary);color:var(--text-primary);text-decoration:none}.nav-dropdown__item:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.nav-dropdown__item--active{color:var(--accent);font-weight:600}.nav-dropdown__item--active::after{content:'';width:6px;height:6px;border-radius:50%;background:var(--accent)}.nav-burger{display:none;align-items:center;justify-content:center;width:44px;height:44px;margin-left:auto;padding:0;background:0 0;border:none;border-radius:var(--radius);cursor:pointer;flex-direction:column;gap:5px;color:var(--text-primary)}.nav-burger:focus-visible,.nav-burger:hover{background:var(--surface-secondary);outline:0}.nav-burger__line{display:block;width:20px;height:2px;background:currentColor;border-radius:1px;transition:transform var(--transition),opacity var(--transition)}.nav-drawer-overlay{position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:150;opacity:0;pointer-events:none;transition:opacity .2s ease}.nav-drawer{position:fixed;top:0;right:0;bottom:0;width:280px;max-width:85vw;background:var(--surface);border-left:1px solid var(--border);box-shadow:-4px 0 24px rgba(0,0,0,.08);z-index:160;transform:translateX(100%);transition:transform .25s ease;overflow:auto}.nav-drawer__inner{padding:24px;padding-top:56px}.nav-drawer__close{position:absolute;top:16px;right:16px;display:flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;background:0 0;border:none;border-radius:var(--radius);cursor:pointer;color:var(--text-secondary)}.nav-drawer__close:hover{background:var(--surface-secondary);color:var(--text-primary)}.nav-drawer__nav{display:flex;flex-direction:column;gap:4px}.nav-drawer__group-label{display:block;margin-top:14px;margin-bottom:4px;font-size:var(--text-xs);font-weight:600;color:var(--text-muted);letter-spacing:.02em}.nav-drawer__nav .nav-drawer__group-label:first-child{margin-top:0}.nav-drawer__item{display:block;padding:12px 14px;font-size:var(--text-base);font-weight:500;color:var(--text-primary);text-decoration:none;border-radius:var(--radius);transition:background var(--transition),color var(--transition)}.nav-drawer__item:hover{background:var(--surface-secondary);text-decoration:none;color:var(--text-primary)}.nav-drawer__item--active{color:var(--accent);font-weight:600}body.nav-drawer-open{overflow:hidden}body.nav-drawer-open .nav-drawer-overlay{opacity:1;pointer-events:auto}body.nav-drawer-open .nav-drawer{transform:translateX(0)}@media (max-width:640px){.site-nav{display:none}.nav-burger{display:flex}}.hero{padding:64px 0 48px;text-align:center}.hero__eyebrow{display:inline-block;font-size:var(--text-xs);font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:8px}.hero h1{font-size:clamp(2rem, 5vw, 3rem);font-weight:400;line-height:var(--line-height-tight);letter-spacing:-.02em;color:var(--text-primary);margin-bottom:16px}.hero__sub{font-size:var(--text-md);color:var(--text-secondary);margin:0 auto 8px;line-height:var(--line-height-relaxed)}.hero__404{font-size:clamp(4rem, 18vw, 7rem);font-weight:700;line-height:var(--line-height-solid);letter-spacing:-.03em;color:var(--text-muted);margin:0 0 8px}.tool-card{display:flex;flex-direction:column;gap:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);padding:40px;margin-bottom:16px}.tool-tabs{display:flex;flex-wrap:wrap;gap:0;border-bottom:1px solid var(--border);margin:-8px 0 0;padding:0 0 8px}.tool-tabs .tab{padding:10px 16px;font-size:var(--text-sm);font-weight:500;font-family:var(--font-body);color:var(--text-muted);background:0 0;border:none;border-radius:var(--radius);cursor:pointer;transition:color var(--transition),background var(--transition);position:relative;margin-bottom:-1px}.tool-tabs .tab:hover{color:var(--text-secondary);background:var(--surface-secondary)}.tool-tabs .tab.active{color:var(--accent);background:0 0}.tool-tabs .tab.active::after{content:'';position:absolute;left:0;right:0;bottom:-9px;height:2px;background:var(--accent);border-radius:2px 2px 0 0}.tool-tabs .tab:focus-visible{outline:2px solid var(--border-focus);outline-offset:2px}.home-tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.home-tool-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;text-decoration:none;color:inherit;transition:border-color var(--transition),box-shadow var(--transition)}.home-tool-card:hover{border-color:var(--accent);box-shadow:var(--shadow-md);text-decoration:none}.home-tool-card__label{font-size:var(--text-md);line-height:var(--line-height-tight);font-weight:600;color:var(--text-secondary)}.home-tool-card__desc{font-size:var(--text-sm);color:var(--text-secondary);margin-top:8px;line-height:var(--line-height-normal)}.drop-zone{border:2px dashed var(--border-strong);border-radius:var(--radius-lg);padding:40px 24px;text-align:center;cursor:pointer;transition:border-color var(--transition),background var(--transition);position:relative;background:var(--surface-secondary)}.drop-zone:focus-within,.drop-zone:hover{border-color:var(--accent);background:var(--accent-light)}.drop-zone.drag-over{border-color:var(--accent);background:var(--accent-light)}.upload-icon{color:var(--accent);margin-bottom:8px}.drop-zone__label{font-size:var(--text-base);font-weight:600;color:var(--text-primary);margin-bottom:4px}.drop-zone__hint{font-size:var(--text-sm);color:var(--text-muted-on-surface)}.drop-zone input[type=file]{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}.file-selected-info{display:none;align-items:center;gap:10px;padding:12px 16px;background:var(--success-bg);border:1px solid #c3dfc5;border-radius:var(--radius);margin-top:16px;font-size:var(--text-sm);color:var(--text-primary);font-weight:500}.file-selected-info.visible{display:flex}.file-selected-info__name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-selected-info__size{flex-shrink:0;font-weight:400}.file-list{display:none;flex-direction:column;gap:8px;margin-top:16px}.file-list.visible{display:flex}.file-list__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:4px}.file-list__header-right{display:flex;flex-direction:column;align-items:flex-end;gap:2px}.file-list__remove-all{background:0 0;border:none;padding:0;font-size:var(--text-xs);font-family:var(--font-body);color:var(--accent);cursor:pointer;text-decoration:underline;text-underline-offset:2px}.file-list__remove-all:hover{color:var(--accent-hover)}.file-list__label-wrap{display:flex;align-items:baseline;gap:4px}.file-list__label{font-size:var(--text-sm);font-weight:600;color:var(--text-primary)}.file-list__count{font-size:var(--text-xs);color:var(--text-muted)}.file-list__items{display:flex;flex-direction:column;gap:10px}.file-list__item{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--surface-secondary);border:1px solid var(--border);border-radius:var(--radius);animation:slideIn .15s ease both}.file-list__item-name{flex:1;font-size:var(--text-sm);font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-list__item-size{font-size:var(--text-xs);color:var(--text-muted);flex-shrink:0}.btn-clear-file,.btn-remove-file{background:0 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var(--border);background:var(--surface);padding-bottom:20px;padding-top:20px}.site-footer__inner{max-width:900px;margin:0 auto;padding:0 24px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}.site-footer__copy{font-size:var(--text-xs);color:var(--text-muted)}.site-footer__note{font-size:var(--text-xs);color:var(--text-muted);display:flex;align-items:center;gap:6px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}@keyframes slideIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}@media (max-width:640px){.container,.container--wide,.site-footer__inner,.site-header__inner{padding-left:16px;padding-right:16px}.hero__sub{font-size:var(--text-base)}}@media (max-width:600px){.tool-card{padding:16px}}@media (max-width:500px){.hero{padding:40px 0 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