/* ========== RESET & BASE ========== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden;font-family:-apple-system,"PingFang SC","Helvetica Neue",sans-serif;background:#f0f2f5;color:#1a1a2e;-webkit-tap-highlight-color:transparent}
button{border:none;background:none;cursor:pointer;font:inherit;color:inherit;-webkit-tap-highlight-color:transparent}
input{font:inherit;border:none;outline:none}

/* ========== LAYOUT ========== */
.app{display:flex;height:100vh;width:100vw;overflow:hidden}

/* ---- Sidebar ---- */
.sidebar{
  width:64px;min-width:64px;background:linear-gradient(180deg,#1e293b 0%,#0f172a 100%);
  display:flex;flex-direction:column;align-items:center;padding:12px 0;z-index:100;
  box-shadow:2px 0 12px rgba(0,0,0,.15);overflow-x:hidden;
}
.sidebar-logo-text{
  font-size:13px;font-weight:700;color:#fff;letter-spacing:1px;
  padding:8px 4px;text-align:center;line-height:1.3;
  background:rgba(255,255,255,.08);border-radius:8px;margin-bottom:8px;
}
.sidebar-nav{flex:1;display:flex;flex-direction:column;gap:6px;padding:4px 0;overflow-y:auto;overflow-x:hidden}
.nav-item{
  width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  font-size:20px;transition:.2s;position:relative;
}
.nav-item:hover,.nav-item.active{background:rgba(255,255,255,.12)}
.nav-item.active::before{
  content:'';position:absolute;left:-8px;top:50%;transform:translateY(-50%);
  width:4px;height:20px;border-radius:0 4px 4px 0;background:#6366f1;
}
.nav-tooltip{
  position:absolute;left:calc(100% + 8px);top:50%;transform:translateY(-50%);
  background:#1e293b;color:#fff;padding:4px 10px;border-radius:6px;font-size:12px;
  white-space:nowrap;pointer-events:none;opacity:0;transition:.2s;z-index:200;
}
.nav-item:hover .nav-tooltip{opacity:1}

/* 底部文字按钮 */
.nav-item-text{
  width:44px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:600;color:rgba(255,255,255,.7);transition:.2s;position:relative;
  flex-direction:column;gap:2px;
}
.nav-item-text span{line-height:1}
.nav-item-text:hover,.nav-item-text.active{background:rgba(255,255,255,.12);color:#fff}
.sidebar-footer{padding:8px 0;display:flex;flex-direction:column;gap:6px;align-items:center;overflow-x:hidden}
.sidebar-user{
  width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#22c55e,#16a34a);
  display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;color:#fff;
  cursor:pointer;position:relative;
}
.sidebar-logout{
  width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  font-size:16px;color:#f87171;transition:.2s;
}
.sidebar-logout:hover{background:rgba(248,113,113,.15)}

/* ---- Main ---- */
.main{flex:1;display:flex;flex-direction:column;overflow:hidden;position:relative;z-index:0}

/* ---- Toolbar ---- */
.toolbar{
  display:flex;align-items:center;gap:6px;padding:8px 12px;
  background:#fff;border-bottom:1px solid #e5e7eb;z-index:1000;
  transition:transform .3s ease;flex-wrap:nowrap;overflow-x:auto;
}
.toolbar.collapsed{transform:translateY(calc(-100% + 36px))}
.toolbar-toggle{
  width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;
  background:#f3f4f6;font-size:16px;flex-shrink:0;
}
.toolbar-divider{width:1px;height:24px;background:#e5e7eb;flex-shrink:0}
.tb-btn{
  display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 10px;
  border-radius:8px;min-width:48px;font-size:10px;color:#6b7280;transition:.15s;flex-shrink:0;
}
.tb-btn:hover{background:#f3f4f6;color:#1f2937}
.tb-btn.active{background:#eef2ff;color:#4f46e5}
.tb-btn svg{width:20px;height:20px}
.tb-slider-wrap{display:flex;flex-direction:column;align-items:center;gap:2px;flex-shrink:0}
.tb-slider-wrap label{font-size:10px;color:#9ca3af}
.tb-slider{width:80px;height:4px;-webkit-appearance:none;appearance:none;background:#e5e7eb;border-radius:2px;outline:none}
.tb-slider::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:#6366f1;cursor:pointer;border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.2)}
.color-picker-wrap{position:relative;flex-shrink:0;z-index:1002}
.color-preview{width:28px;height:28px;border-radius:8px;border:2px solid #e5e7eb;cursor:pointer}
.color-dropdown{
  position:absolute;top:calc(100% + 6px);left:0;background:#fff;border:1px solid #e5e7eb;
  border-radius:12px;padding:10px;box-shadow:0 8px 24px rgba(0,0,0,.12);z-index:1002;
  display:none;
}
.color-dropdown.show{display:block}
.color-dropdown.fixed{position:fixed;display:block}
.color-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}
.color-swatch{width:28px;height:28px;border-radius:6px;cursor:pointer;border:2px solid transparent;transition:.15s}
.color-swatch:hover,.color-swatch.active{border-color:#6366f1;transform:scale(1.15)}
.color-custom{margin-top:8px;display:flex;gap:6px;align-items:center}
.color-custom input[type="color"]{width:32px;height:28px;border:1px solid #e5e7eb;border-radius:6px;cursor:pointer}

/* ---- Page Container ---- */
.page-container{flex:1;position:relative;overflow:hidden;background:#fafafa}
.page-view{position:absolute;inset:0;display:none;flex-direction:column;overflow:hidden}
.page-view.active{display:flex}

/* ---- Canvas Area ---- */
.canvas-area{flex:1;position:relative;overflow:hidden;background:#fafafa}
.cursor-circle{
  position:absolute;pointer-events:none;border-radius:50%;
  transform:translate(-50%,-50%);z-index:50;
  transition:width .1s,height .1s,border-color .1s;
}
.canvas-container{
  position:absolute;top:0;left:0;width:100%;height:100%;touch-action:none;z-index:10;
}
.canvas-container canvas{position:absolute;top:0;left:0}
#bgCanvas{z-index:1}
#drawCanvas{z-index:2}

/* ---- Modal Overlay ---- */
.modal-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:900;
  display:none;align-items:center;justify-content:center;backdrop-filter:blur(4px);
}
.modal-overlay.show{display:flex}
.modal{
  background:#fff;border-radius:20px;padding:28px 24px;width:340px;max-width:90vw;
  box-shadow:0 20px 60px rgba(0,0,0,.2);animation:modalIn .25s ease;position:relative;
}
@keyframes modalIn{from{opacity:0;transform:translateY(20px) scale(.96)}to{opacity:1;transform:none}}
.modal h2{text-align:center;font-size:20px;margin-bottom:20px;color:#1e293b}
.modal-close{
  position:absolute;top:12px;right:12px;width:28px;height:28px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:18px;color:#9ca3af;
  transition:.15s;
}
.modal-close:hover{background:#f3f4f6;color:#1f2937}
.modal-body{position:relative}
.form-group{margin-bottom:14px}
.form-group label{display:block;font-size:13px;color:#6b7280;margin-bottom:4px}
.form-group input{
  width:100%;padding:10px 12px;border:1px solid #d1d5db;border-radius:10px;
  font-size:14px;transition:.15s;background:#f9fafb;
}
.form-group input:focus{border-color:#6366f1;background:#fff;box-shadow:0 0 0 3px rgba(99,102,241,.12)}
.slider-captcha{
  position:relative;height:40px;background:#f3f4f6;border-radius:10px;overflow:hidden;margin-bottom:14px;
  border:1px solid #e5e7eb;
}
.slider-track{
  position:absolute;top:0;left:0;height:100%;background:linear-gradient(90deg,#6366f1,#8b5cf6);
  border-radius:10px 0 0 10px;opacity:.15;transition:none;
}
.slider-block{
  position:absolute;top:2px;width:36px;height:36px;background:#fff;border:1px solid #d1d5db;
  border-radius:6px;box-shadow:0 1px 4px rgba(0,0,0,.15);cursor:grab;z-index:10;
  display:flex;align-items:center;justify-content:center;font-size:14px;
}
.slider-block:active{cursor:grabbing}
.slider-hint{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  font-size:12px;color:#9ca3af;pointer-events:none;white-space:nowrap;
}
.modal-actions{display:flex;gap:10px;margin-top:16px}
.modal-actions button{flex:1;padding:10px;border-radius:10px;font-size:14px;font-weight:600;transition:.15s}
.btn-primary{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff}
.btn-primary:hover{opacity:.9}
.btn-primary:disabled{opacity:.5;cursor:not-allowed}
.btn-secondary{background:#f3f4f6;color:#6b7280}
.btn-secondary:hover{background:#e5e7eb}
.auth-switch{text-align:center;margin-top:14px;font-size:13px;color:#6b7280}
.auth-switch a{color:#6366f1;cursor:pointer;text-decoration:none}
.auth-switch a:hover{text-decoration:underline}
.error-msg{color:#ef4444;font-size:12px;margin-top:6px;display:none}
.error-msg.show{display:block}

/* ---- Confirm Dialog ---- */
.confirm-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:950;
  display:none;align-items:center;justify-content:center;
}
.confirm-overlay.show{display:flex}
.confirm-box{
  background:#fff;border-radius:16px;padding:24px;width:300px;text-align:center;
  box-shadow:0 12px 40px rgba(0,0,0,.15);animation:modalIn .2s ease;
}
.confirm-box p{font-size:15px;margin-bottom:18px;color:#374151}
.confirm-box .modal-actions{margin-top:0}

/* ---- Toast ---- */
.toast{
  position:fixed;top:20px;left:50%;transform:translateX(-50%);
  background:#1e293b;color:#fff;padding:10px 20px;border-radius:10px;
  font-size:14px;z-index:1100;opacity:0;transition:.3s;pointer-events:none;
  box-shadow:0 4px 16px rgba(0,0,0,.2);
}
.toast.show{opacity:1}

/* ---- Online Badge ---- */
.online-badge{
  position:absolute;top:8px;right:12px;background:rgba(255,255,255,.9);
  padding:4px 12px;border-radius:20px;font-size:12px;color:#6b7280;
  box-shadow:0 1px 4px rgba(0,0,0,.08);z-index:40;display:flex;align-items:center;gap:4px;
}
.online-dot{width:8px;height:8px;border-radius:50%;background:#22c55e}

/* ---- Share Modal ---- */
.share-modal{max-width:380px}
.share-modal canvas{width:100%;border-radius:12px;border:1px solid #e5e7eb;margin-bottom:12px}
.share-modal p{font-size:13px;color:#6b7280;text-align:center;margin-bottom:12px}

/* ---- Placeholder Pages ---- */
.placeholder-page{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:#9ca3af;font-size:18px;gap:12px;
}
.placeholder-page .icon{font-size:64px}
.placeholder-page .hint{font-size:14px;color:#d1d5db}

/* ---- Responsive ---- */
@media(min-width:768px){
  .sidebar{width:72px;min-width:72px}
  .nav-item{width:52px;height:52px;font-size:22px}
  .modal{width:380px;padding:32px 28px}
}