:root{--bg:#0D1117;--bg2:#161B22;--bg3:#21262D;--glass:rgba(22,27,34,0.7);--border:rgba(36,150,237,0.15);--border2:rgba(36,150,237,0.35);--t1:#F0F6FC;--t2:#8B949E;--t3:#6E7681;--primary:#2496ED;--secondary:#58A6FF;--accent:#7EE787;--green:#4ADE80;--yellow:#E3B341;--orange:#F0883E;--red:#F85149;--r:8px;--tr:0.2s ease;--f:'Inter',-apple-system,sans-serif;--m:'SF Mono','Fira Code',monospace}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden}
body{font-family:var(--f);background:var(--bg);color:var(--t1);-webkit-font-smoothing:antialiased}
.app-container{display:flex;flex-direction:column;height:100vh}
.app-header{background:var(--glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:12px 20px;z-index:10;flex-shrink:0}
.header-content{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}
.logo-group{display:flex;align-items:center;gap:12px}
.logo-icon{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:linear-gradient(135deg,rgba(36,150,237,0.15),rgba(126,231,135,0.08));border-radius:var(--r);border:1px solid var(--border)}
h1{font-size:1.1rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.header-actions{display:flex;gap:6px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border:none;border-radius:var(--r);font-family:var(--f);font-size:0.8rem;font-weight:600;cursor:pointer;transition:all var(--tr);white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--primary),#4EADFC);color:#fff;box-shadow:0 2px 12px rgba(36,150,237,0.3)}
.btn-primary:hover{box-shadow:0 4px 20px rgba(36,150,237,0.5);transform:translateY(-1px)}
.btn-secondary{background:var(--bg3);color:var(--t2);border:1px solid var(--border)}
.btn-secondary:hover{border-color:var(--border2);color:var(--t1)}
.btn-ghost{background:transparent;color:var(--t3)}
.btn-ghost:hover{color:var(--t2);background:rgba(255,255,255,0.05)}
.main-content{display:flex;flex:1;overflow:hidden}
.editor-section{flex:1;display:flex;flex-direction:column;overflow:hidden}
.editor-header{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background:var(--bg2);border-bottom:1px solid var(--border)}
.editor-title{font-size:0.75rem;font-weight:600;text-transform:uppercase;letter-spacing:0.08em;color:var(--t3)}
.issue-count{font-size:0.75rem;font-weight:600;color:var(--t3);font-family:var(--m)}
.editor-body{flex:1;display:flex;overflow:hidden;position:relative}
.line-numbers{padding:16px 12px 16px 16px;background:var(--bg);color:var(--t3);font-family:var(--m);font-size:0.82rem;line-height:1.7;text-align:right;user-select:none;overflow:hidden;min-width:40px;flex-shrink:0;border-right:1px solid var(--border)}
.dockerfile-editor{flex:1;padding:16px;background:var(--bg);color:var(--t1);font-family:var(--m);font-size:0.82rem;line-height:1.7;border:none;resize:none;outline:none;overflow:auto;tab-size:2;white-space:pre;word-wrap:normal}
.dockerfile-editor::placeholder{color:var(--t3)}
.results-section{width:380px;min-width:300px;display:flex;flex-direction:column;border-left:1px solid var(--border);flex-shrink:0;overflow:hidden}
.results-header{padding:8px 16px;background:var(--bg2);border-bottom:1px solid var(--border)}
.results-title{font-size:0.75rem;font-weight:600;text-transform:uppercase;letter-spacing:0.08em;color:var(--t3)}
.results-list{flex:1;overflow-y:auto;padding:8px}
.empty-state{padding:40px 20px;text-align:center;color:var(--t3);font-size:0.85rem}
.lint-item{padding:10px 12px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);margin-bottom:6px;transition:border-color var(--tr);cursor:default}
.lint-item:hover{border-color:var(--border2)}
.lint-header{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.lint-severity{font-size:0.72rem;font-weight:700;padding:2px 6px;border-radius:4px}
.lint-severity.error{background:rgba(248,81,73,0.15);color:var(--red)}
.lint-severity.warning{background:rgba(227,179,65,0.15);color:var(--yellow)}
.lint-severity.info{background:rgba(36,150,237,0.15);color:var(--primary)}
.lint-line{font-size:0.72rem;color:var(--t3);font-family:var(--m)}
.lint-rule{font-size:0.72rem;color:var(--t3);margin-left:auto;font-family:var(--m)}
.lint-msg{font-size:0.82rem;color:var(--t2);line-height:1.5}
.lint-fix{margin-top:6px;padding:6px 8px;background:rgba(126,231,135,0.06);border:1px solid rgba(126,231,135,0.15);border-radius:6px;font-size:0.78rem;color:var(--accent)}
.line-highlight{background:rgba(248,81,73,0.08)}
@media(max-width:768px){.main-content{flex-direction:column}.results-section{width:100%;min-width:unset;max-height:40vh;border-left:none;border-top:1px solid var(--border)}}
.results-list::-webkit-scrollbar,.dockerfile-editor::-webkit-scrollbar{width:6px}
.results-list::-webkit-scrollbar-track,.dockerfile-editor::-webkit-scrollbar-track{background:transparent}
.results-list::-webkit-scrollbar-thumb,.dockerfile-editor::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}