:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f6f7f9;color:#171717;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--ink: #171717;--muted: #667085;--line: #d6dbe3;--line-strong: #bdc6d2;--panel: #ffffff;--panel-soft: #f9fafb;--accent: #0f766e;--accent-dark: #0b5f59;--accent-soft: #e6f4f1;--danger: #b3261e;--shadow: 0 12px 34px rgba(15, 23, 42, .08)}*{box-sizing:border-box}html{min-width:320px}body{min-width:320px;margin:0;background:linear-gradient(180deg,#fff 0,#f6f7f9 280px),#f6f7f9}button,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{width:min(1120px,calc(100% - 32px));min-height:56px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-size:15px;font-weight:700;letter-spacing:0;text-decoration:none;white-space:nowrap}.brand-mark{width:30px;height:30px;display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.nav{display:flex;align-items:center;gap:8px}.nav-link{min-height:32px;min-width:44px;display:inline-grid;place-items:center;padding:0 14px;border:1px solid transparent;border-radius:7px;color:var(--muted);font-size:13px;font-weight:650;text-decoration:none}.nav-link.active{border-color:var(--line);background:var(--panel);color:var(--ink)}.language-control{min-height:32px;display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:7px;background:var(--panel);color:var(--ink);padding:0 8px}.language-select{min-height:30px;max-width:128px;border:0;background:transparent;color:var(--ink);font-size:13px;font-weight:650;outline:none}.main{flex:1;width:100%}.tool-layout{width:min(1120px,calc(100% - 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32px));margin:90px auto}.not-found h1{margin-bottom:18px}.not-found a{color:var(--accent-dark);font-weight:800}@media(max-width:860px){.tool-layout{padding-top:18px}.workspace{grid-template-columns:1fr}.preview-panel{min-height:auto}.qr-stage{min-height:360px}.qr-scale-box{width:min(100%,320px)}.result-bar{align-items:stretch;flex-direction:column}.actions{justify-content:stretch}.actions button{flex:1 1 180px}}@media(max-width:540px){.topbar,.tool-layout{width:min(100% - 20px,1180px)}.topbar{min-height:58px}.brand span:last-child{display:none}.language-control{padding:0 6px}.language-select{max-width:108px}.input-panel,.preview-panel{padding:14px}h1{font-size:26px}textarea{min-height:170px}.segmented.correction{grid-template-columns:repeat(2,minmax(0,1fr))}.qr-stage{grid-template-columns:1fr;min-height:300px;padding:10px;gap:12px}.qr-scale-box{width:min(100%,260px)}.size-badge{width:min(100%,260px);grid-template-columns:auto 1fr;align-items:center;column-gap:12px}.size-badge strong{text-align:right}.primary-button,.secondary-button{width:100%}}