:root{--bg:#f4f6f9;--surface:#fff;--text:#1c2430;--muted:#5a6577;--border:#d6dce5;--accent:#1f5fbf;--accent-hover:#194f9f;--accent-contrast:#fff;--send:#1f5fbf;--receive:#2e8b4e;--tool:#c8641a;--success:#2e8b4e;--warning:#c8641a;--danger:#b3261e;--danger-hover:#93201a;--danger-bg:#fdecea;--success-bg:#e3f3e8;--warning-bg:#fbeee3;--focus:#ffb400;--sel:#1f5fbf26;--radius:8px;--radius-sm:6px;--header-h:48px;--shadow:0 1px 3px #00000014,0 4px 12px #0000000a;--buncss-light:initial;--buncss-dark: ;color-scheme:light dark;--fg:var(--text);--bg-surface:var(--surface);--border-color:var(--border);--primary-color:var(--accent);--surface-color:var(--surface);--radius-md:var(--radius);--color-error:var(--danger)}@media (prefers-color-scheme:dark){:root{--buncss-light: ;--buncss-dark:initial}}:root[data-theme=light]{--buncss-light:initial;--buncss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#14181f;--surface:#1d232c;--text:#e6eaf0;--muted:#9aa5b5;--border:#333c49;--accent:#6ea2f5;--accent-hover:#8db6f7;--accent-contrast:#0b1220;--send:#6ea2f5;--receive:#5cc27f;--tool:#f0995a;--success:#5cc27f;--warning:#f0995a;--danger:#ff8a80;--danger-hover:#ffa59d;--danger-bg:#3a1a18;--success-bg:#17301f;--warning-bg:#3a2616;--sel:#6ea2f540;--shadow:0 1px 3px #0006;--buncss-light: ;--buncss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--bg:#14181f;--surface:#1d232c;--text:#e6eaf0;--muted:#9aa5b5;--border:#333c49;--accent:#6ea2f5;--accent-hover:#8db6f7;--accent-contrast:#0b1220;--send:#6ea2f5;--receive:#5cc27f;--tool:#f0995a;--success:#5cc27f;--warning:#f0995a;--danger:#ff8a80;--danger-hover:#ffa59d;--danger-bg:#3a1a18;--success-bg:#17301f;--warning-bg:#3a2616;--sel:#6ea2f540;--shadow:0 1px 3px #0006;--buncss-light: ;--buncss-dark:initial;color-scheme:dark}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100dvh;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif;line-height:1.5}:focus-visible{outline:3px solid var(--focus);outline-offset:2px}#app{display:flex;flex-direction:column;min-height:100dvh}main{flex:1;width:100%;max-width:960px;margin:0 auto;padding:1.5rem 1rem 2rem}header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;z-index:50;top:0}header nav{display:flex;min-height:var(--header-h);align-items: center;gap:8px;max-width:960px;margin:0 auto;padding:6px 12px}.logo-link{display:inline-flex;text-decoration:none;color:var(--text);border-radius:var(--radius-sm);align-items: center;gap:8px}.brand{display:inline-grid;border-radius:var(--radius-sm);background:var(--accent);color:var(--accent-contrast);place-items: center;min-width:28px;height:28px;padding:0 6px;font-size:.8rem;font-weight:700}.logo-link h1{font-size:1.05rem;font-weight:600}.app-version{color:var(--muted);text-decoration:none;white-space:nowrap;border-radius:4px;padding:2px 4px;font-family:ui-monospace,monospace;font-size:.75rem}.app-version:hover{color:var(--accent);text-decoration:underline}.build-hash{font-family:ui-monospace,monospace;font-size:.7rem}@media (max-width:480px){.build-hash{display:none}}.nav-actions{display:flex;align-items: center;gap:6px;margin-inline-start:auto}header nav .icon-btn{background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);cursor:pointer;display:flex;text-decoration:none;justify-content:center;align-items: center;width:32px;height:32px;transition:border-color .15s;font-size:1.05rem}header nav .icon-btn:hover{border-color:var(--accent)}.icon-svg{fill:none;stroke:currentColor;stroke-width:2;stroke-linejoin:round;stroke-linecap:round}.update-banner{position:fixed;bottom:16px;z-index:100;display:flex;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);flex-wrap:wrap;align-items: center;gap:8px;max-width:calc(100vw - 32px);padding:10px 14px;box-shadow:0 4px 16px 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button{background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;min-height:32px;padding:4px 10px}.update-banner button.primary{background:var(--accent);color:var(--accent-contrast);border-color:var(--accent)}@media print{.update-banner{display:none!important}}.landing{padding:1rem 0}.landing h2{max-width:480px;margin:0 auto 1rem;font-size:1.1rem}.landing .mode-grid+h2{margin-top:2rem}.landing>.settings-hint{max-width:480px;margin:1rem auto 0}.mode-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;max-width:480px;margin:0 auto}@media (max-width:400px){.mode-grid{grid-template-columns:1fr}}.mode-group-title{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;max-width:480px;margin:1.5rem auto .75rem;font-size:.85rem;font-weight:600}.mode-btn{display:flex;text-align:start;background:var(--surface);border:1px solid var(--border);border-inline-start:6px solid 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var(--border);border-radius:var(--radius);background:var(--bg-surface);color:var(--fg);flex:1;padding:.5rem;font-family:monospace}.confirmation-code{letter-spacing:.5rem;text-align:center;background:var(--bg-surface);border-radius:var(--radius);margin:1rem 0;padding:1rem;font-family:monospace;font-size:3rem;font-weight:700}.peer-id-text{word-break:break-all;opacity:.7;margin-top:.5rem;font-size:.8rem}.webrtc-waiting,.webrtc-confirm,.webrtc-transfer,.webrtc-connect,.webrtc-complete{text-align:center;padding:1rem 0}.file-select{margin-top:1rem}.settings-group{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:1.5rem;padding:1rem}.settings-group h3{margin-bottom:.75rem;font-size:1rem}.settings-field{margin-bottom:.75rem}.settings-field label{display:block;margin-bottom:.25rem;font-size:.85rem;font-weight:500}.settings-field input[type=text],.settings-field input[type=number],.settings-field input[type=password],.settings-field 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