/* Copyright (c) 2025 J.S.Jasrotia. License: MIT. See LICENSE file for details. */
:root[data-theme=dark]{--bg-primary:#121214;--bg-surface:#1e1e24;--bg-editor:#151518;--bg-gutter:#0f0f12;--border-color:#2a2a32;--text-main:#e1e1e6;--text-muted:#7c7c8a;--text-editor:#e1e1e6;--text-gutter:#4b4b56;--accent-color:#04d361;--accent-hover:#00b34d;--error-color:#f75a68;--sidebar-active-bg:#04d36114;--banner-bg:#04d3611f}:root[data-theme=light]{--bg-primary:#f0f2f5;--bg-surface:#fff;--bg-editor:#fff;--bg-gutter:#f7f9fa;--border-color:#dcdfe6;--text-main:#1f2937;--text-muted:#6b7280;--text-editor:#111827;--text-gutter:#9ca3af;--accent-color:#00b34d;--accent-hover:#04d361;--error-color:#dc2626;--sidebar-active-bg:#00b34d14;--banner-bg:#00b34d1a}:root{--sidebar-width:280px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-main);height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;transition:background-color .2s,color .2s;overflow:hidden}#app{flex-direction:column;height:100vh;display:flex}.hidden{display:none!important}.app-header{background-color:var(--bg-surface);border-bottom:1px solid var(--border-color);z-index:10;justify-content:space-between;align-items:center;padding:.75rem 1.5rem;transition:background-color .2s,border-color .2s;display:flex}.logo{letter-spacing:.5px;font-size:1.2rem;font-weight:700}.header-actions{align-items:center;gap:.75rem;display:flex}.run-button{background-color:var(--accent-color);color:#fff;cursor:pointer;border:none;border-radius:4px;padding:.5rem 1.25rem;font-weight:600;transition:background .2s}:root[data-theme=dark] .run-button{color:#000}.run-button:hover{background-color:var(--accent-hover)}.run-button:disabled{background-color:var(--text-muted);cursor:not-allowed}.clear-button,.theme-button{color:var(--text-muted);border:1px solid var(--border-color);cursor:pointer;background-color:#0000;border-radius:4px;padding:.5rem 1.25rem;font-weight:600;transition:all .2s}.clear-button:hover,.theme-button:hover{color:var(--text-main);border-color:var(--text-muted);background-color:#78787814}.main-layout{flex:1;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);background-color:var(--bg-surface);border-right:1px solid var(--border-color);flex-direction:column;transition:background-color .2s,border-color .2s;display:flex;overflow-y:auto}.sidebar-title{text-transform:uppercase;letter-spacing:1.2px;color:var(--text-muted);border-bottom:1px solid var(--border-color);padding:1rem;font-size:.85rem;font-weight:700}.sidebar-header-wrapper{border-bottom:1px solid var(--border-color);background-color:var(--bg-surface);padding:1rem}.progress-container{margin-top:.5rem}.progress-text-label{color:var(--text-muted);justify-content:space-between;margin-bottom:.25rem;font-size:.75rem;font-weight:600;display:flex}.progress-bar-track{background-color:var(--bg-primary);border-radius:3px;width:100%;height:6px;overflow:hidden}.progress-bar-fill{background-color:var(--accent-color);width:0%;height:100%;transition:width .3s cubic-bezier(.4,0,.2,1)}.exercise-list{flex-direction:column;list-style:none;display:flex}.exercise-item{border-bottom:1px solid var(--border-color);cursor:pointer;padding:1rem;transition:background .2s}.exercise-item:hover{background-color:#7878780a}.exercise-item.active{background-color:var(--sidebar-active-bg);border-left:3px solid var(--accent-color)}.exercise-row{justify-content:space-between;align-items:center;margin-bottom:.25rem;display:flex}.exercise-item-title{font-size:.95rem;font-weight:600}.exercise-item.active .exercise-item-title{color:var(--accent-color)}.status-badge{background-color:var(--accent-color);color:#fff;border-radius:10px;padding:1px 6px;font-size:.75rem;font-weight:700}:root[data-theme=dark] .status-badge{color:#000}.exercise-item-desc{color:var(--text-muted);font-size:.8rem;line-height:1.3}.workspace{flex:1;grid-template-columns:1fr 1fr;display:grid;overflow:hidden}.pane{flex-direction:column;height:100%;display:flex;overflow:hidden}.editor-pane{border-right:1px solid var(--border-color)}.pane-header-wrapper{background-color:var(--bg-surface);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding-right:1rem;display:flex}.pane-header{text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);padding:.5rem 1rem;font-size:.85rem}.reset-link-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;font-size:.75rem;text-decoration:underline}.reset-link-btn:hover{color:var(--error-color)}.editor-wrapper{background-color:var(--bg-editor);flex:1;transition:background-color .2s;display:flex;position:relative;overflow:hidden}.line-numbers{text-align:right;width:45px;color:var(--text-gutter);user-select:none;background-color:var(--bg-gutter);padding:1rem .5rem;font-family:Fira Code,Courier New,Courier,monospace;font-size:14px;line-height:20px;transition:background-color .2s,color .2s;overflow:hidden}#code-editor{color:var(--text-editor);resize:none;white-space:pre;background:0 0;border:none;outline:none;flex:1;padding:1rem;font-family:Fira Code,Courier New,Courier,monospace;font-size:14px;line-height:20px;transition:color .2s;overflow-y:auto}.output-content{background-color:var(--bg-primary);flex-direction:column;flex:1;gap:1rem;padding:1rem;transition:background-color .2s;display:flex;overflow-y:auto}.output-section{flex-direction:column;flex:1;min-height:140px;display:flex}.section-title{color:var(--text-muted);margin-bottom:.5rem;font-size:.8rem;font-weight:600}.log-box,.result-box{background-color:var(--bg-editor);border:1px solid var(--border-color);white-space:pre-wrap;color:var(--text-editor);border-radius:4px;flex:1;padding:.75rem;font-family:Fira Code,Courier New,Courier,monospace;font-size:14px;transition:background-color .2s,border-color .2s,color .2s;overflow-y:auto}.log-entry{color:var(--text-editor);margin-bottom:.25rem}.empty{color:var(--text-muted);font-style:italic}.error-text{color:var(--error-color);font-weight:700}.success-banner{background-color:var(--banner-bg);border:1px solid var(--accent-color);border-radius:6px;justify-content:space-between;align-items:center;margin-bottom:.5rem;padding:1rem;display:flex}.success-banner.hidden{display:none!important}.banner-text{color:var(--accent-color);font-size:.9rem;font-weight:600}.next-button{background-color:var(--accent-color);color:#fff;cursor:pointer;border:none;border-radius:4px;padding:.4rem 1rem;font-size:.85rem;font-weight:700}:root[data-theme=dark] .next-button{color:#000}.next-button:disabled{background-color:var(--text-muted);cursor:not-allowed}.auth-modal-overlay{backdrop-filter:blur(4px);z-index:1000;background-color:#000c;justify-content:center;align-items:center;width:100vw;height:100vh;transition:opacity .2s;display:flex;position:fixed;top:0;left:0}.auth-modal-overlay.hidden{display:none!important}.auth-card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:8px;width:100%;max-width:400px;padding:2.5rem;box-shadow:0 10px 25px #0000004d}.auth-card h2{text-align:center;margin-bottom:.25rem;font-size:1.5rem;font-weight:700}.auth-subtitle{color:var(--text-muted);text-align:center;margin-bottom:1.5rem;font-size:.85rem}.form-group{flex-direction:column;gap:.5rem;margin-bottom:1.25rem;display:flex}.form-group label{color:var(--text-main);font-size:.85rem;font-weight:600}.form-group input{background-color:var(--bg-editor);border:1px solid var(--border-color);color:var(--text-editor);border-radius:4px;outline:none;padding:.75rem;font-size:.9rem;transition:border-color .2s}.form-group input:focus{border-color:var(--accent-color)}.auth-btn{width:100%;margin-top:.5rem;font-size:.95rem;padding:.75rem!important}.auth-toggle-msg{text-align:center;color:var(--text-muted);margin-top:1.25rem;font-size:.85rem}.auth-toggle-msg button{margin-left:.25rem;font-size:.85rem;font-weight:600}