:root{--bg:#FAFAF9;--bg-alt:#F5F5F4;--surface:#FFFFFF;--border:#E7E5E4;--border-strong:#D6D3D1;--text:#1E293B;--text-secondary:#52525B;--text-muted:#71717A;--primary:#4F46E5;--primary-hover:#4338CA;--primary-light:rgba(79,70,229,0.08);--secondary:#F97316;--accent:#EC4899;--success:#059669;--radius:10px;--radius-lg:14px;--radius-xl:20px;--shadow-sm:0 1px 2px rgba(0,0,0,0.04);--shadow:0 4px 12px rgba(0,0,0,0.06);--shadow-lg:0 12px 32px rgba(0,0,0,0.08)}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:'Inter','Noto Sans SC',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}.page{max-width:960px;margin:0 auto;padding:0 32px}.toast{position:fixed;top:24px;right:24px;background:var(--text);color:var(--bg);padding:10px 18px;border-radius:100px;font-size:14px;font-weight:500;display:flex;align-items:center;gap:8px;z-index:1000;transform:translateX(calc(100%+40px));transition:transform 0.3s cubic-bezier(0.34,1.56,0.64,1);box-shadow:0 4px 16px rgba(0,0,0,0.12)}.toast.show{transform:translateX(0)}.toast-dot{width:8px;height:8px;background:var(--success);border-radius:50%}.btn-upload{padding:10px 24px;background:var(--primary-light);border:1px solid rgba(79,70,229,0.15);border-radius:100px;font-family:inherit;font-size:14px;font-weight:500;color:var(--primary);cursor:pointer;display:inline-block;transition:all 0.15s}.btn-upload:hover{background:rgba(79,70,229,0.12)}.ratio-btn{padding:8px 18px;background:transparent;border:1px solid var(--border);border-radius:100px;font-family:inherit;font-size:13px;color:var(--text-muted);cursor:pointer;transition:all 0.15s}.ratio-btn:hover{border-color:var(--primary);color:var(--primary)}.ratio-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary{padding:10px 24px;background:var(--primary);border:none;border-radius:100px;font-family:inherit;font-size:14px;font-weight:600;color:#fff;cursor:pointer;transition:all 0.15s}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:disabled{opacity:0.5;cursor:not-allowed}.crop-container{position:relative;width:100%;min-height:400px;background:var(--bg-alt);border:2px dashed var(--border);border-radius:var(--radius-lg);overflow:hidden;display:flex;align-items:center;justify-content:center}#canvas{max-width:100%;max-height:500px;display:block;cursor:crosshair}#header.scrolled{background:rgba(255,255,255,0.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 2px 20px rgba(0,0,0,0.06)}.guide-section{margin-top:16px;margin-bottom:64px;background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden}.guide-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:14px 20px;background:none;border:none;cursor:pointer;transition:background 0.15s}.guide-toggle:hover{background:var(--bg-alt)}.guide-toggle-title{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:#1E293B}.guide-toggle.open .toggle-arrow{transform:rotate(180deg)}.toggle-arrow{transition:transform 0.2s ease;color:var(--text-muted)}.guide-list{padding:0 20px 20px}.guide-list.hidden{display:none}.guide-item{padding:16px 0;border-top:1px solid var(--border)}.guide-item-title{font-size:14px;font-weight:600;color:#1E293B;margin-bottom:6px}.guide-item-body{font-size:13px;color:var(--text-secondary);line-height:1.8}.guide-item-body kbd{padding:1px 6px;background:var(--bg-alt);border:1px solid var(--border-strong);border-radius:4px;font-family:'SF Mono','Cascadia Code',monospace;font-size:12px}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f5f9}::-webkit-scrollbar-thumb{background:#A5B4FC;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#4F46E5}::selection{background:rgba(79,70,229,0.2);color:#1E293B}@media(max-width:768px){.page{padding:0 16px}}