:root{--bg:#fafafb;--bg-elevated:#fff;--bg-subtle:#f1f1f4;--border:#e4e4ea;--border-strong:#d2d2db;--text:#0f0f14;--text-muted:#5c5c6b;--accent:#5b4bf5;--accent-hover:#4a3ae0;--accent-soft:#5b4bf51a;--accent-contrast:#fff;--success:#0f9d58;--success-soft:#0f9d581f;--danger:#d93036;--danger-soft:#d930361a;--warning:#b45309;--warning-soft:#d977061f;--shadow:0 1px 2px #0f0f140a, 0 8px 24px #0f0f140f;--radius:16px;--radius-small:10px;--font:"Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, "SF Mono", "Cascadia Code", Menlo, monospace;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--bg:#0b0b10;--bg-elevated:#14141b;--bg-subtle:#1b1b24;--border:#25252f;--border-strong:#34343f;--text:#f3f3f6;--text-muted:#9d9dad;--accent:#7c6dff;--accent-hover:#9186ff;--accent-soft:#7c6dff29;--success:#3ecf8e;--success-soft:#3ecf8e24;--danger:#ff6369;--danger-soft:#ff63691f;--warning:#f5a524;--warning-soft:#f5a52424;--shadow:0 1px 2px #0000004d, 0 8px 32px #00000059;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);min-height:100dvh;color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.5;transition:background-color .2s,color .2s}body.no-scroll{overflow:hidden}h1,h2,p{margin:0}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}.app{flex-direction:column;min-height:100dvh;display:flex}.header{z-index:10;padding:max(12px, env(safe-area-inset-top)) 20px 12px;background:color-mix(in srgb, var(--bg) 82%, transparent);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;display:flex;position:sticky;top:0}.logo{color:var(--text);letter-spacing:-.02em;align-items:center;gap:10px;font-size:18px;font-weight:700;display:inline-flex}.logo:hover{text-decoration:none}.header-nav{align-items:center;gap:6px;display:flex}.nav-link{color:var(--text-muted);border-radius:8px;padding:8px 10px;font-size:14px;font-weight:500}.nav-link:hover,.nav-link.is-active{color:var(--text);background:var(--bg-subtle);text-decoration:none}.icon-button{border:1px solid var(--border);background:var(--bg-elevated);width:38px;height:38px;color:var(--text);cursor:pointer;border-radius:10px;place-items:center;transition:background-color .15s,transform .15s;display:grid}.icon-button:hover{background:var(--bg-subtle)}.icon-button:active{transform:scale(.95)}.main{flex:1;width:100%;max-width:960px;margin:0 auto;padding:24px 16px 48px}.footer{padding:20px 16px max(20px, env(safe-area-inset-bottom));text-align:center;color:var(--text-muted);border-top:1px solid var(--border);font-size:13px}.page{flex-direction:column;gap:20px;animation:.25s both fade-in;display:flex}.page.narrow,.about{max-width:560px;margin:0 auto}.page-title{letter-spacing:-.03em;font-size:clamp(26px,6vw,34px);line-height:1.15}.back-link{color:var(--text-muted);align-self:flex-start;font-size:14px;font-weight:500}.card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.stack{flex-direction:column;gap:14px;display:flex}.center{text-align:center;align-items:center}.muted{color:var(--text-muted)}.hero{text-align:center;padding:clamp(24px,8vw,64px) 0 8px}.hero-title{letter-spacing:-.05em;background:linear-gradient(135deg, var(--text) 30%, var(--accent));color:#0000;-webkit-background-clip:text;background-clip:text;font-size:clamp(44px,13vw,76px);font-weight:800;line-height:1}.hero-subtitle{color:var(--text-muted);margin-top:14px;font-size:clamp(17px,4.5vw,21px)}.choices{gap:14px;width:100%;max-width:720px;margin:12px auto 0;display:grid}@media (min-width:640px){.choices{grid-template-columns:1fr 1fr}}.choice{border-radius:var(--radius);background:var(--bg-elevated);border:1px solid var(--border);min-height:150px;box-shadow:var(--shadow);color:var(--text);flex-direction:column;gap:6px;padding:24px;transition:transform .2s,border-color .2s,box-shadow .2s;display:flex;position:relative}.choice:hover{border-color:var(--accent);text-decoration:none;transform:translateY(-2px)}.choice:active{transform:translateY(0)scale(.99)}.choice-emoji{margin-bottom:6px;font-size:34px;line-height:1}.choice-title{letter-spacing:-.02em;font-size:20px;font-weight:700}.choice-hint{color:var(--text-muted);font-size:15px}.choice-arrow{color:var(--text-muted);font-size:20px;transition:transform .2s,color .2s;position:absolute;top:22px;right:22px}.choice:hover .choice-arrow{color:var(--accent);transform:translate(3px)}.home-more{text-align:center;font-weight:500}.privacy-note{text-align:center;max-width:520px;color:var(--text-muted);justify-content:center;align-items:baseline;gap:8px;margin:0 auto;font-size:14px;display:flex}.button{border:1px solid var(--border-strong);background:var(--bg-elevated);min-height:46px;color:var(--text);font:inherit;cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:0 18px;font-weight:600;transition:background-color .15s,border-color .15s,transform .1s,opacity .15s;display:inline-flex}.button:hover:not(:disabled){background:var(--bg-subtle)}.button:active:not(:disabled){transform:scale(.98)}.button:disabled{opacity:.6;cursor:default}.button-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-contrast)}.button-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.button-large{width:100%;min-height:56px;font-size:17px}.button-ghost{color:var(--text-muted);background:0 0;border-color:#0000}.button-small{min-height:38px;padding:0 14px}.spinner{border:2px solid;border-right-color:#0000;border-radius:50%;width:18px;height:18px;animation:.7s linear infinite spin}.spinner-large{width:36px;height:36px;color:var(--accent);border-width:3px}.dropzone{border-radius:var(--radius);border:2px dashed var(--border-strong);background:var(--bg-elevated);transition:border-color .2s,background-color .2s,transform .2s}.dropzone.is-dragging{border-color:var(--accent);background:var(--accent-soft);transform:scale(1.01)}.dropzone-button{width:100%;color:var(--text);font:inherit;cursor:pointer;border-radius:var(--radius);background:0 0;border:0;flex-direction:column;align-items:center;gap:8px;padding:clamp(36px,10vw,64px) 20px;display:flex}.dropzone-icon{font-size:40px}.dropzone-title{font-size:19px;font-weight:700}.dropzone-hint{color:var(--text-muted);font-size:14px}.file-summary{align-items:center;gap:14px;min-width:0;display:flex}.file-summary-icon{background:var(--bg-subtle);border-radius:12px;flex-shrink:0;place-items:center;width:52px;height:52px;font-size:26px;display:grid}.file-summary-text{min-width:0}.file-name{overflow-wrap:anywhere;font-size:17px;font-weight:650}.file-meta{color:var(--text-muted);font-size:14px;font-family:var(--mono);flex-wrap:wrap;gap:6px;display:flex}.center .file-meta{justify-content:center}.sender{flex-direction:column;align-items:center;gap:16px;width:100%;max-width:720px;margin:0 auto;animation:.25s both fade-in;display:flex}.sender-head{text-align:center;flex-direction:column;align-items:center;gap:2px;max-width:100%;display:flex}.sender-brand{letter-spacing:.08em;text-transform:uppercase;color:var(--accent);font-size:13px;font-weight:700}.sender-file{text-overflow:ellipsis;white-space:nowrap;max-width:100%;font-size:17px;font-weight:650;overflow:hidden}.sender-counter{font-family:var(--mono);color:var(--text-muted);align-items:center;gap:8px;font-size:15px;display:flex}.sender-counter strong{color:var(--text)}.badge{font-family:var(--font);background:var(--accent-soft);color:var(--accent);border-radius:999px;padding:2px 8px;font-size:12px;font-weight:600}.qr-frame{aspect-ratio:1;width:min(100%,72dvh,680px);box-shadow:var(--shadow);background:#fff;border-radius:18px;padding:0;overflow:hidden}.qr-canvas{width:100%;height:100%;image-rendering:pixelated;display:block}.sender .progress{width:min(100%,680px)}.sender-controls{grid-template-columns:1fr 1.2fr 1fr;gap:10px;width:min(100%,520px);display:grid}.sender-controls .button{min-height:54px}.sender-options{flex-wrap:wrap;justify-content:center;align-items:flex-end;gap:16px 24px;display:flex}.sender-footnote{text-align:center;max-width:520px;color:var(--text-muted);font-size:13px}.segmented{border:0;min-width:0;margin:0;padding:0}.segmented-legend{color:var(--text-muted);margin-bottom:6px;padding:0;font-size:13px;font-weight:600}.segmented-options{background:var(--bg-subtle);border:1px solid var(--border);border-radius:12px;padding:4px;display:flex}.segmented-option{color:var(--text-muted);cursor:pointer;border-radius:9px;padding:8px 14px;font-size:14px;font-weight:600;transition:background-color .15s,color .15s;position:relative}.segmented-option input{opacity:0;pointer-events:none;position:absolute}.segmented-option.is-selected{background:var(--bg-elevated);color:var(--text);box-shadow:0 1px 3px #0000001f}.segmented-option:has(input:focus-visible){outline:2px solid var(--accent)}.jump{color:var(--text-muted);align-items:center;gap:8px;font-size:13px;font-weight:600;display:flex}.jump input{border:1px solid var(--border-strong);background:var(--bg-elevated);width:76px;min-height:38px;color:var(--text);font:inherit;font-family:var(--mono);border-radius:10px;padding:0 10px}@media (max-width:420px){.hide-xs{display:none}}.progress{align-items:center;gap:12px;width:100%;display:flex}.progress-track{background:var(--bg-subtle);border:1px solid var(--border);border-radius:999px;flex:1;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--accent), #a78bfa);transform-origin:0;height:100%;transition:transform .25s}.progress-percent{text-align:right;min-width:42px;font-family:var(--mono);color:var(--text-muted);font-size:13px}.banner{text-align:left;border-radius:12px;gap:12px;padding:14px;animation:.2s both fade-in;display:flex}.banner-error{background:var(--danger-soft);color:var(--danger)}.banner-warning{background:var(--warning-soft);color:var(--warning)}.banner-icon{width:22px;height:22px;color:var(--bg-elevated);border-radius:50%;flex-shrink:0;place-items:center;font-size:13px;font-weight:800;display:grid}.banner-error .banner-icon{background:var(--danger)}.banner-warning .banner-icon{background:var(--warning)}.banner-title{font-weight:650}.banner-hint{color:var(--text);opacity:.8;margin-top:2px;font-size:14px}.scan-overlay{z-index:50;background:#000;animation:.2s both fade-in;position:fixed;inset:0}@media (min-width:900px){.scan-overlay{background:#000000d9;place-items:center;padding:32px;display:grid}.scan-overlay .scanner{border-radius:20px;width:min(100%,960px);height:min(100%,720px)}}.scanner{color:#fff;background:#000;width:100%;height:100%;position:relative;overflow:hidden}.scanner-video{object-fit:cover;width:100%;height:100%;position:absolute;inset:0}.scanner-loading{color:#ffffffb3;place-items:center;display:grid;position:absolute;inset:0}.scanner-reticle{aspect-ratio:1;pointer-events:none;border:2px solid #ffffffd9;border-radius:24px;width:min(84vw,70vh,560px);position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:0 0 0 100vmax #00000059}.hud-top,.hud-bottom{text-align:center;flex-direction:column;align-items:center;gap:8px;padding:16px 20px;display:flex;position:absolute;left:0;right:0}.hud-top{padding-top:max(16px, env(safe-area-inset-top));background:linear-gradient(#000000b3,#0000);top:0}.hud-bottom{padding-bottom:max(20px, env(safe-area-inset-bottom));background:linear-gradient(#0000,#000000bf);bottom:0}.hud-top .progress{max-width:420px}.hud-top .progress-track{background:#fff3;border-color:#0000}.hud-top .progress-percent,.hud-file,.hud-missing{color:#fffc}.hud-counter{font-family:var(--mono);font-size:18px}.hud-counter strong{font-size:24px}.hud-file,.hud-missing{text-overflow:ellipsis;white-space:nowrap;max-width:100%;font-size:13px;overflow:hidden}.hud-feedback{white-space:nowrap;text-overflow:ellipsis;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:999px;max-width:calc(100% - 32px);padding:8px 14px;font-size:14px;font-weight:600;animation:.2s both pop;position:absolute;bottom:calc(50% - min(42vw,35vh,280px) - 48px);left:50%;overflow:hidden;transform:translate(-50%)}.hud-feedback-accepted{color:#04210f;background:#3ecf8ee6}.hud-feedback-duplicate{color:#111;background:#ffffffd9}.hud-feedback-warning{color:#211300;background:#f5a524f2}.button-hud{color:#111;background:#fffffff2;border-color:#0000;min-width:160px}.button-hud:hover:not(:disabled){background:#fff}@media (orientation:landscape) and (max-height:500px){.hud-top{text-align:left;align-items:flex-start}.hud-top .progress{max-width:260px}}.chunk-summary{flex-direction:column;gap:12px;display:flex}.chunk-heading{color:var(--text-muted);font-size:15px}.chunk-heading strong{color:var(--text);font-family:var(--mono)}.chunk-missing{font-family:var(--mono);color:var(--danger);overflow-wrap:anywhere;font-size:13px}.chunk-grid{grid-template-columns:repeat(auto-fill,minmax(58px,1fr));gap:6px;max-height:320px;margin:0;padding:0;list-style:none;display:grid;overflow-y:auto}.chunk{font-family:var(--mono);text-align:center;border-radius:8px;padding:4px 6px;font-size:12px}.chunk.is-ok{background:var(--success-soft);color:var(--success)}.chunk.is-missing{background:var(--danger-soft);color:var(--danger)}.result-check{background:var(--success-soft);width:64px;height:64px;color:var(--success);border-radius:50%;place-items:center;font-size:32px;font-weight:800;animation:.35s cubic-bezier(.2,1.4,.4,1) both pop;display:grid}.result-title{letter-spacing:-.02em;font-size:24px}.integrity{background:var(--success-soft);color:var(--success);border-radius:999px;padding:6px 12px;font-size:14px;font-weight:600}.steps{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.step{background:var(--bg-elevated);border:1px solid var(--border);border-radius:14px;align-items:center;gap:14px;padding:14px 16px;font-weight:500;display:flex}.step-number{background:var(--accent-soft);width:30px;height:30px;color:var(--accent);border-radius:50%;flex-shrink:0;place-items:center;font-size:14px;font-weight:700;display:grid}.callout{background:var(--success-soft);color:var(--success);text-align:center;border-radius:14px;padding:14px 16px;font-weight:600}.prose h2{margin:4px 0 8px;font-size:18px}.prose h2+ul{margin-bottom:16px}.prose ul{color:var(--text-muted);margin:0;padding-left:20px}.prose li+li{margin-top:6px}@keyframes fade-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}@keyframes pop{0%{opacity:0;scale:.9}to{opacity:1;scale:1}}@keyframes spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}.transfer-estimate{font-family:var(--mono);color:var(--text-muted);margin:0;font-size:13px}.protocol-badge{background:var(--bg-subtle);color:var(--text-muted);font-family:var(--mono);letter-spacing:0;text-transform:none;border-radius:999px;margin-left:6px;padding:2px 8px;font-size:11px;font-weight:600}.badge-warning{background:var(--warning-soft);color:var(--warning)}.speed-slider{width:100%;accent-color:var(--accent);margin-top:10px}.catch-up{flex-direction:column;gap:10px;width:min(100%,560px);padding:16px;display:flex}.catch-up-label{flex-direction:column;gap:2px;font-weight:600;display:flex}.catch-up-label .muted{font-size:13px;font-weight:400}.catch-up-row{flex-wrap:wrap;gap:8px;display:flex}.catch-up-row input{border:1px solid var(--border-strong);background:var(--bg-elevated);min-height:38px;color:var(--text);font:inherit;font-family:var(--mono);border-radius:10px;flex:160px;padding:0 12px}.catch-up-row input[aria-invalid=true]{border-color:var(--danger)}.field-error{color:var(--danger);font-size:13px}.missing-for-sender{flex-direction:column;gap:6px;display:flex}.missing-ranges{background:var(--bg-subtle);font-family:var(--mono);overflow-wrap:anywhere;-webkit-user-select:all;user-select:all;border-radius:10px;padding:10px 12px;font-size:15px;display:block}.hud-badge{vertical-align:middle;background:#ffffff2e;border-radius:999px;margin-left:8px;padding:1px 7px;font-size:12px}.hud-hint{font-family:var(--font);font-size:16px}.hud-stats{font-family:var(--mono);color:#ffffffb3;font-size:12px}