:root{
--bg:#fafafa;
--text:#2c3e50;
--border:#e1e8ed;
--accent:#667eea;
--hover:#5a6fd8;
--surface:#ffffff;
--sidebar:#f8fafc;
--shadow:0 2px 12px rgba(0,0,0,0.08);
--shadow-hover:0 8px 25px rgba(0,0,0,0.15);
--radius:12px
}
[data-theme="dark"]{
--bg:#0f1419;
--text:#f7fafc;
--border:#4a5568;
--accent:#4fd1c7;
--hover:#38b2ac;
--surface:#2d3748;
--sidebar:#1a202c;
--shadow:0 2px 12px rgba(0,0,0,0.3);
--shadow-hover:0 8px 25px rgba(0,0,0,0.4)
}
*{box-sizing:border-box;margin:0;padding:0}
[x-cloak]{display:none!important}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;transition:all 0.3s ease}
.container{display:flex;min-height:100vh;max-width:100vw}
.main-content{flex:1;display:flex;flex-direction:column;padding:20px;min-width:0}
.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;padding:16px 20px;background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow)}
.header-left{display:flex;align-items:center;gap:12px}
.header-right{display:flex;gap:8px}
.btn-base{background:var(--surface);border:1px solid var(--border);border-radius:8px;cursor:pointer;transition:all 0.2s;color:var(--text);box-shadow:var(--shadow)}
.btn-base.key-pressed{background:var(--accent);color:white;transform:scale(0.95);box-shadow:var(--shadow-hover)}
.btn-base:hover{background:var(--accent);color:white;transform:translateY(-1px)}
.home-btn{padding:8px 12px;text-decoration:none}
.icon-btn{padding:8px 12px;font-size:16px}
h1{font-size:24px;font-weight:600;color:var(--text)}
.workspace{display:flex;flex:1;gap:24px;min-height:0}
.canvas-area{flex:1;display:flex;flex-direction:column;min-width:0}
.canvas-container{flex:1;display:flex;justify-content:center;align-items:center;background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;min-height:400px;transition:all 0.3s;border:2px dashed transparent}
.canvas-container.upload-mode{cursor:pointer}
.canvas-container.upload-mode:hover{box-shadow:var(--shadow-hover);border-color:var(--accent)}
.upload-placeholder{text-align:center;color:var(--text);opacity:0.7}
.upload-icon{font-size:48px;margin-bottom:16px}
.upload-text{font-size:16px;font-weight:500;margin-bottom:8px}
.upload-hint{font-size:14px;opacity:0.6}
.main-canvas{border:1px solid var(--border);border-radius:8px;background:white;cursor:crosshair;max-width:100%;max-height:100%;object-fit:contain}
.sidebar{width:280px;background:var(--sidebar);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;display:flex;flex-direction:column;gap:24px;margin-left:24px}
.section{background:var(--surface);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.section-title{font-size:14px;font-weight:600;color:var(--text);margin-bottom:16px;text-transform:uppercase;letter-spacing:0.5px}
.effect-selector{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.effect-btn{padding:12px;font-weight:500;text-transform:capitalize;text-align:center;font-size:14px;display:flex;justify-content:center;align-items:center;gap:6px}
.effect-btn:hover{box-shadow:var(--shadow-hover)}
.effect-btn.active{background:var(--accent);color:white;border-color:var(--accent);box-shadow:var(--shadow-hover)}
.info-icon{font-size:12px;opacity:0.6;padding:2px;border-radius:50%;transition:all 0.2s}
.info-icon:hover{opacity:1;background:rgba(255,255,255,0.2);transform:scale(1.1)}
.popup-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(0,0,0,0.5);display:flex;justify-content:center;align-items:center;z-index:1000}
.popup-content{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-hover);max-width:500px;width:90vw;max-height:80vh;overflow-y:auto}
.popup-header{display:flex;justify-content:space-between;align-items:center;padding:20px;border-bottom:1px solid var(--border)}
.popup-header h3{margin:0;font-size:18px;font-weight:600}
.close-btn{padding:4px 8px;font-size:18px;line-height:1}
.popup-body{padding:20px}
.popup-body p{margin-bottom:12px}
.popup-body ul{margin:12px 0;padding-left:20px}
.popup-body li{margin-bottom:8px}
.history-actions{display:flex;gap:6px;margin-bottom:12px}
.history-btn{padding:10px 12px;font-size:16px;text-align:center;min-width:44px}
.history-btn:hover{background:var(--accent);color:white;box-shadow:var(--shadow-hover)}
.export-actions{display:flex;flex-direction:column;gap:8px}
.action-btn{padding:14px;font-weight:500;text-align:center}
.action-btn:hover{background:var(--hover);color:white;box-shadow:var(--shadow-hover)}
.action-btn.primary{background:var(--accent);color:white;border-color:var(--accent);box-shadow:var(--shadow-hover)}
.action-btn.primary:hover{background:var(--hover)}
.version{position:fixed;bottom:10px;right:10px;font-size:11px;color:var(--text);opacity:0.5;background:var(--surface);padding:4px 8px;border-radius:6px;border:1px solid var(--border);box-shadow:var(--shadow)}
@media (max-width:1024px){
.workspace{flex-direction:column}
.sidebar{width:100%;margin-left:0;margin-top:24px}
.effect-selector{grid-template-columns:repeat(4,1fr)}
.export-actions{flex-direction:row;flex-wrap:wrap}
}
@media (max-width:768px){
.main-content{padding:15px}
.header{flex-direction:column;gap:12px;padding:12px 16px}
.header-left,.header-right{width:100%;justify-content:center}
.section{padding:16px}
.effect-selector{grid-template-columns:1fr 1fr;gap:6px}
.effect-btn,.action-btn{padding:10px;font-size:13px}
h1{font-size:20px}
}