@import "https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&family=JetBrains+Mono:wght@500&display=swap";:root{--bg-main:#0b0d13;--bg-header:#10131d;--bg-surface:#141724;--bg-card:#1b2030;--bg-card-hover:#22293e;--bg-viewport:#13151d;--bg-terminal:#090a0f;--cad-cyan:#00d2ff;--cad-cyan-rgb:0, 210, 255;--cad-cyan-glow:#00d2ff4d;--cad-green:#0f8;--cad-green-glow:#00ff884d;--cad-orange:#ffa502;--cad-orange-glow:#ffa5024d;--cad-red:#ff4757;--cad-yellow:#ffd32a;--cad-purple:#a55eea;--text-main:#f8fafc;--text-secondary:#cbd5e1;--text-muted:#94a3b8;--text-dim:#64748b;--border-subtle:#23293a;--border-bright:#333c54;--border-cyan:#00d2ff66;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:18px;--shadow-sm:0 2px 4px #0006;--shadow-md:0 8px 24px #00000080;--shadow-lg:0 16px 40px #000000a6;--shadow-glow:0 0 20px var(--cad-cyan-glow);--font-ui:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", Menlo, 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li{color:#c9d4e5;animation:.8s cubic-bezier(.2,.8,.2,1) both fadeUp;animation-delay:calc(.4s + var(--d));align-items:center;gap:.9rem;display:flex}.auth-features span{color:var(--c2);background:#00d2ff0f;border:1px solid #00d2ff4d;border-radius:8px;padding:.3rem .5rem;font:600 .75rem JetBrains Mono,monospace}.auth-card{--rx:0deg;--ry:0deg;--mx:50%;--my:50%;-webkit-backdrop-filter:blur(22px)saturate(140%);transform:perspective(1200px) rotateX(var(--rx)) rotateY(var(--ry));background:linear-gradient(160deg,#161c2ac7,#0c0f18d9);border-radius:26px;padding:2.2rem 2.2rem 1.6rem;transition:transform .25s ease-out;animation:1s cubic-bezier(.2,.8,.2,1) .15s both cardIn;position:relative;overflow:hidden;box-shadow:0 30px 80px #0000008c,inset 0 0 0 1px #ffffff0a}@keyframes cardIn{0%{opacity:0;transform:perspective(1200px)translateY(40px)rotateX(12deg)scale(.96)}}.auth-card-glow{pointer-events:none;background:radial-gradient(420px circle at var(--mx) var(--my), #00d2ff1f, transparent 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.auth-pane:first-child{opacity:0;pointer-events:none}.pane-title{margin:0 0 .35rem;font-size:1.55rem;font-weight:700;animation:.5s both fadeUp}.pane-sub{color:#8d9ab0;margin:0 0 1.5rem;font-size:.92rem;line-height:1.5}.auth-collapse{opacity:0;grid-template-rows:0fr;transition:grid-template-rows .45s cubic-bezier(.65,0,.35,1),opacity .35s;display:grid}.auth-collapse>*{overflow:hidden}.auth-collapse.open{opacity:1;grid-template-rows:1fr}.auth-field{background:#ffffff09;border:1px solid #ffffff17;border-radius:14px;align-items:center;margin-bottom:1rem;transition:border-color .3s,box-shadow .3s,background .3s;display:flex;position:relative}.auth-field:focus-within{background:#00d2ff0d;border-color:#00d2ff99;box-shadow:0 0 0 4px #00d2ff1f,0 0 24px #00d2ff26}.field-icon{color:#63708a;transition:color .3s;position:absolute;left:15px}.auth-field:focus-within .field-icon{color:var(--c2)}.auth-field input{color:#fff;background:0 0;border:0;outline:0;flex:1;min-width:0;padding:1.35rem 1rem 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.7s;position:absolute;inset:0;transform:translate(-100%)}.auth-submit:hover:not(:disabled){background-position:100%;transform:translateY(-2px);box-shadow:0 16px 40px #00ff8859}.auth-submit:hover:not(:disabled):after{transform:translate(100%)}.auth-submit:active:not(:disabled){transform:translateY(0)scale(.98)}.auth-submit:disabled{opacity:.6;cursor:not-allowed}.auth-submit svg{transition:transform .3s}.auth-submit:hover svg{transform:translate(4px)}.auth-back{cursor:pointer;color:#8592a8;background:0 0;border:0;align-items:center;gap:.35rem;margin-bottom:1rem;padding:0;font:500 .85rem Outfit,sans-serif;display:inline-flex}.auth-back:hover{color:var(--c2)}.code-icon{width:54px;height:54px;color:var(--c1);background:#00ff881a;border:1px solid #00ff884d;border-radius:16px;place-items:center;margin-bottom:1rem;animation:2.2s ease-in-out infinite pulse;display:grid}@keyframes pulse{0%,to{box-shadow:0 0 #00ff8859}50%{box-shadow:0 0 0 12px #0f80}}.code-row{grid-template-columns:repeat(6,1fr);gap:.6rem;margin:.5rem 0 1.2rem;display:grid}.code-box{aspect-ratio:1/1.15;text-align:center;color:#fff;width:100%;animation:.5s cubic-bezier(.2,.8,.2,1.4) both popIn;animation-delay:calc(var(--i) * 60ms + .3s);background:#ffffff0a;border:1px solid #ffffff1a;border-radius:14px;outline:0;font:700 1.6rem JetBrains Mono,monospace;transition:all .25s cubic-bezier(.2,.8,.2,1)}@keyframes popIn{0%{opacity:0;transform:translateY(14px)scale(.8)}}.code-box:focus{border-color:var(--c2);transform:translateY(-3px);box-shadow:0 0 0 4px #00d2ff26}.code-box.filled{color:var(--c1);text-shadow:0 0 12px #0f89;background:#00ff8812;border-color:#00ff888c}.verifying{color:var(--c2);align-items:center;gap:.5rem;margin-bottom:.8rem;font-size:.9rem;display:flex}.auth-link{cursor:pointer;color:var(--c2);background:0 0;border:0;padding:0;font:500 .9rem Outfit,sans-serif}.auth-link:disabled{color:#5d6a80;cursor:default}.auth-alert{border-radius:12px;align-items:flex-start;gap:.55rem;margin-top:1.1rem;padding:.8rem .95rem;font-size:.88rem;line-height:1.45;animation:.35s both fadeUp;display:flex}.auth-alert svg{flex-shrink:0;margin-top:2px}.auth-alert.error{color:#ffb4bd;background:#ff47571a;border:1px solid #ff47574d}.auth-alert.warn{color:#ffe08a;background:#ffd32a14;border:1px solid #ffd32a4d;margin:0 0 1.2rem}.auth-alert code{font-family:JetBrains Mono,monospace;font-size:.82rem}.auth-foot{color:#6f7c94;border-top:1px solid #ffffff0f;justify-content:center;align-items:center;gap:.4rem;margin-top:1.5rem;padding-top:1.1rem;font-size:.8rem;display:flex}.auth-foot strong{color:#9fb0c8;font-weight:600}.spin{animation:.8s linear infinite spinSlow}@keyframes fadeUp{0%{opacity:0;transform:translateY(18px)}}.auth-splash{color:#0f8;background:#0a0d14;place-items:center;display:grid;position:fixed;inset:0}@media 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var(--border-subtle);z-index:5;background:#0f121ce6;border-radius:20px;align-items:center;gap:8px;padding:4px 8px;display:flex;position:absolute;top:14px;left:50%;transform:translate(-50%);box-shadow:0 4px 14px #0006}.overlay-nav-btn{color:var(--text-muted);background:0 0;border-radius:50%;justify-content:center;align-items:center;width:26px;height:26px;display:flex}.overlay-nav-btn:hover:not(:disabled){background:var(--bg-card);color:var(--text-main)}.overlay-nav-btn:disabled{opacity:.3;cursor:not-allowed}.overlay-step-counter{color:var(--text-secondary);padding:0 4px;font-size:12px}.element-count-tag{color:var(--cad-green);background:#00ff881a;border:1px solid #00ff8840;border-radius:12px;margin-left:6px;padding:2px 7px;font-size:11px}.canvas-active-cmd-chip{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--border-cyan);border-radius:var(--radius-sm);z-index:5;pointer-events:none;background:#0e111ad9;align-items:center;gap:8px;padding:6px 12px;animation:.25s ease-out fadeIn;display:flex;position:absolute;top:14px;left:16px;box-shadow:0 4px 12px #00000080}.chip-indicator{background:var(--cad-green);width:6px;height:6px;box-shadow:0 0 6px var(--cad-green);border-radius:50%}.chip-cmd-name{font-family:var(--font-mono);color:var(--cad-cyan);font-size:12px;font-weight:700}.chip-step-title{color:var(--text-secondary);font-size:12px}.tool-btn.active-highlight{color:var(--cad-cyan);background:#00d2ff1f;border-color:#00d2ff59}.tool-btn.active-highlight:hover{border-color:var(--cad-cyan);background:#00d2ff33}.step-guide-container{flex-direction:column;gap:20px;padding:24px;display:flex}.guide-header{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.back-link-btn{color:var(--text-muted);background:0 0;margin-bottom:6px;padding:0;font-size:12px}.back-link-btn:hover{color:var(--cad-cyan)}.title-row{align-items:center;gap:10px;display:flex}.title-row h2{font-size:20px;font-weight:800}.category-tag{text-transform:uppercase;background:var(--bg-card);color:var(--cad-cyan);border:1px solid var(--border-subtle);border-radius:4px;padding:2px 8px;font-size:11px;font-weight:600}.step-nav-bar{flex-direction:column;gap:12px;display:flex}.progress-info{color:var(--text-secondary);justify-content:space-between;margin-bottom:6px;font-size:12px;display:flex}.percent-text{color:var(--cad-cyan);font-weight:600}.progress-track{background:var(--bg-main);border:1px solid var(--border-subtle);border-radius:4px;width:100%;height:6px;overflow:hidden}.progress-fill{height:100%;box-shadow:0 0 8px var(--cad-cyan-glow);background:linear-gradient(90deg,#00d2ff 0%,#0f8 100%);border-radius:4px;transition:width .3s}.step-pills-row{flex-wrap:wrap;gap:6px;display:flex}.step-pill{border-radius:var(--radius-sm);background:var(--bg-card);width:28px;height:28px;color:var(--text-muted);border:1px solid var(--border-subtle);justify-content:center;align-items:center;font-size:12px;font-weight:600;display:flex}.step-pill:hover{background:var(--bg-card-hover);color:var(--text-main)}.step-pill.active{background:var(--cad-cyan);color:#050b14;border-color:var(--cad-cyan);box-shadow:0 0 10px #00d2ff66}.step-pill.completed{color:var(--cad-green);background:#00ff8826;border-color:#00ff8859}.uploaded-image-preview-panel{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:12px}.panel-toggle-bar{justify-content:space-between;align-items:center;display:flex}.panel-title{align-items:center;gap:6px;font-size:12px;font-weight:600;display:flex}.original-img-box{border-radius:var(--radius-sm);border:1px solid var(--border-subtle);background:#000;justify-content:center;align-items:center;max-height:200px;margin-top:10px;display:flex;overflow:hidden}.original-img-box img{object-fit:contain;max-width:100%;max-height:200px}.active-step-card{background:var(--bg-card);border:1px solid var(--border-bright);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);flex-direction:column;gap:18px;padding:24px;display:flex}.step-card-header{flex-direction:column;gap:6px;display:flex}.step-num-badge{color:var(--cad-cyan);text-transform:uppercase;letter-spacing:.05em;font-size:11px;font-weight:700;display:inline-block}.step-title{font-size:18px;font-weight:800;line-height:1.4}.step-explanation p{color:var(--text-secondary);font-size:14px;line-height:1.6}.step-command-highlight{background:var(--bg-main);border:1px solid var(--border-subtle);border-radius:var(--radius-md);justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.cmd-chip-left{align-items:center;gap:10px;display:flex}.cmd-icon-wrap{width:32px;height:32px;color:var(--cad-cyan);border-radius:var(--radius-sm);background:#00d2ff1a;justify-content:center;align-items:center;display:flex}.cmd-chip-names{flex-direction:column;display:flex}.cmd-primary-name{color:#fff;font-size:14px;font-weight:700}.cmd-sub-name{color:var(--text-muted);font-size:11px}.cmd-shortcut-tag{align-items:center;gap:8px;display:flex}.shortcut-label{color:var(--text-muted);font-size:12px}.shortcut-key{color:var(--cad-cyan);background:#0d1017;border:1px solid #00d2ff4d;border-radius:4px;padding:4px 10px;font-size:13px;font-weight:700}.cad-command-simulator{background:var(--bg-terminal);border-radius:var(--radius-md);border:1px solid #232736;overflow:hidden;box-shadow:inset 0 2px 8px #0009}.sim-header{background:#121520;border-bottom:1px solid #232736;justify-content:space-between;align-items:center;padding:8px 12px;display:flex}.sim-dots{gap:5px;display:flex}.sim-dot{background:#333a4d;border-radius:50%;width:8px;height:8px}.sim-title{font-family:var(--font-mono);color:var(--text-muted);font-size:11px}.copy-seq-btn{color:var(--cad-cyan);background:0 0;gap:4px;padding:3px 8px;font-size:11px}.copy-seq-btn:hover{background:#00d2ff1a}.sim-terminal-screen{font-family:var(--font-mono);color:#0f8;flex-direction:column;gap:6px;padding:14px;font-size:12.5px;display:flex}.terminal-line{align-items:flex-start;gap:8px;line-height:1.4;display:flex}.line-prefix{color:var(--cad-cyan);font-weight:700}.line-text{color:#e2e8f0}.pro-tip-box{border-radius:var(--radius-md);background:#ffa50214;border:1px solid #ffa50240;padding:14px 16px}.tip-header{color:var(--cad-orange);text-transform:uppercase;align-items:center;gap:6px;margin-bottom:6px;font-size:12px;font-weight:700;display:flex}.tip-text{color:#fed330;font-size:13px;line-height:1.5}.step-actions-footer{border-top:1px solid var(--border-subtle);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding-top:18px;display:flex}.completion-checkbox-label{color:var(--text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:8px;font-size:13px;display:flex}.completion-checkbox-label input{cursor:pointer;accent-color:var(--cad-green);width:16px;height:16px}.nav-buttons-group{gap:8px;display:flex}.modal-tabs{background:var(--bg-main);border-bottom:1px solid var(--border-subtle);gap:4px;padding:0 16px;display:flex}.tab-btn{color:var(--text-muted);background:0 0;border-bottom:2px solid #0000;border-radius:0;padding:12px 16px;font-size:13px}.tab-btn:hover{color:var(--text-main)}.tab-btn.active{color:var(--cad-cyan);border-bottom-color:var(--cad-cyan);font-weight:600}.dictionary-filter-bar{flex-direction:column;gap:12px;margin-bottom:20px;display:flex}.search-box{align-items:center;display:flex;position:relative}.search-icon{color:var(--text-dim);position:absolute;left:12px}.search-box input{padding-left:36px;padding-right:36px}.search-clear-btn{color:var(--text-dim);background:0 0;padding:4px;position:absolute;right:12px}.search-clear-btn:hover{color:var(--text-main)}.category-pills{flex-wrap:wrap;gap:6px;display:flex}.pill-btn{background:var(--bg-main);color:var(--text-muted);border:1px solid var(--border-subtle);border-radius:14px;padding:4px 12px;font-size:12px}.pill-btn:hover{color:var(--text-main);background:var(--bg-surface)}.pill-btn.active{background:var(--cad-cyan);color:#050b14;border-color:var(--cad-cyan);font-weight:600}.commands-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px;max-height:480px;padding-right:6px;display:grid;overflow-y:auto}.command-card{background:var(--bg-main);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);flex-direction:column;gap:8px;padding:14px;display:flex}.command-card:hover{border-color:var(--border-bright)}.cmd-header{justify-content:space-between;align-items:center;display:flex}.cmd-primary{color:#fff;margin-right:6px;font-size:15px;font-weight:700}.cmd-secondary{color:var(--text-muted);font-size:12px}.cmd-category-tag{text-transform:uppercase;color:var(--cad-cyan);font-size:10px;font-weight:600}.cmd-desc{color:var(--text-secondary);font-size:12.5px;line-height:1.4}.cmd-usage{border-left:2px solid var(--cad-cyan);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:#111420;padding:6px 10px;font-size:12px}.cmd-usage strong{text-transform:uppercase;color:var(--text-dim);margin-bottom:2px;font-size:10px;display:block}.cmd-tip{color:#fed330;border-radius:var(--radius-sm);background:#ffa50214;align-items:flex-start;gap:6px;padding:6px 10px;font-size:11.5px;display:flex}.fkeys-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px;display:grid}.fkey-card{background:var(--bg-main);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);align-items:center;gap:12px;padding:12px;display:flex}.fkey-badge kbd{text-align:center;min-width:48px;padding:4px 10px;font-size:13px}.fkey-desc strong{color:var(--text-secondary);font-size:13px;font-weight:500}.code-preview-container{background:var(--bg-terminal);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);overflow:hidden}.code-preview-header{background:var(--bg-main);border-bottom:1px solid var(--border-subtle);color:var(--text-muted);justify-content:space-between;align-items:center;padding:8px 14px;font-size:12px;display:flex}.code-preview-content{font-family:var(--font-mono);color:#0f8;white-space:pre-wrap;max-height:280px;padding:16px;font-size:12px;overflow-y:auto}.help-steps-list{flex-direction:column;gap:16px;display:flex}.help-step-item{gap:16px;display:flex}.help-step-number{width:32px;height:32px;color:var(--cad-cyan);background:#00d2ff26;border:1px solid #00d2ff4d;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-weight:700;display:flex}.help-step-content h4{margin-bottom:4px;font-size:15px}.help-step-content p{color:var(--text-secondary);font-size:13px;line-height:1.5}@media (width<=1024px){.tutorial-split-layout{flex-direction:column;height:auto;overflow:visible}.viewport-section{border-right:none;border-bottom:1px solid var(--border-subtle);height:480px}.guide-aside{max-width:100%;height:auto}}@media (width<=768px){.app-header{flex-wrap:wrap;gap:10px;height:auto;padding:10px 14px}.header-brand{order:1}.header-actions{order:2}.header-nav{order:3;justify-content:center;width:100%}.viewport-section{height:360px}.drawings-grid{grid-template-columns:1fr}}.smart-drawing-correction-banner{border-radius:var(--radius-md);background:linear-gradient(135deg,#ffaa001f 0%,#00d2ff14 100%);border:1px solid #fa06;flex-direction:column;gap:10px;margin-bottom:16px;padding:14px 16px;animation:.3s fadeInDown;display:flex;box-shadow:0 4px 20px #ffaa001a}.correction-banner-header{align-items:center;gap:8px;display:flex}.correction-banner-header .banner-title{color:#ffa502;letter-spacing:.3px;font-size:.92rem;font-weight:700}.banner-desc{color:#cbd5e1;margin:0;font-size:.84rem;line-height:1.45}.banner-desc strong{color:#0f8}.correction-banner-btns{flex-wrap:wrap;gap:8px;margin-top:4px;display:flex}.btn-switch-correct-drawing{border-radius:var(--radius-sm);cursor:pointer;border:none;align-items:center;gap:8px;padding:8px 14px;font-size:.82rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-switch-correct-drawing.primary{color:#0a0e17;background:linear-gradient(135deg,#0f8 0%,#00d2ff 100%);box-shadow:0 2px 10px #00ff8840}.btn-switch-correct-drawing.primary:hover{transform:translateY(-1px);box-shadow:0 4px 16px #0f86}.btn-switch-correct-drawing.secondary{border:1px solid var(--border-subtle);color:#cbd5e1;background:#ffffff14}.btn-switch-correct-drawing.secondary:hover{color:#fff;background:#ffffff26}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}